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  • 246601.
    Yogi, Rutambhara
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Hermansson, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Design of the RF Distribution System for the ESS Spoke Linac2013Report (Other academic)
    Abstract [en]

    Based on the known boundary conditions of cost, ionizing radiation and space, we propose a combination of coaxial lines and waveguides for the RF distribution system of the spoke linac. At full power level (400 kW peak) 6-1/8" coaxial lines are used in low radiation level zones while WR2300 half-height waveguide are used in high radiation level zones. At lower power levels and in low radiation zones 3-1/8" and 7/8" coaxial lines are used.

  • 246602.
    Yogi, Rutambhara
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Dancila, Dragos
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Gajewski, Konrad
    Uppsala University, The Svedberg Laboratory.
    Hermansson, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Noor, Masih
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Wedberg, Rolf
    Uppsala University, The Svedberg Laboratory.
    Santiago-Kern, Rocio
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Lofnes, Tor
    Uppsala University, The Svedberg Laboratory.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Goryashko, Vitaly
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ruber, R J M Y
    CERN, Geneve, Schweiz.
    Uppsala high power test stand for ESS spoke cavities2012In: Proceedings of LINAC2012, 2012, p. 711-713Conference paper (Refereed)
  • 246603.
    Yogi, Rutambhara
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Wedberg, Rolf
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Goryashko, Vitaliy
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Santiago-Kern, Rocio
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Hermansson, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Lofnes, Tor
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Gajewski, Konrad
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Dancila, Dragos
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Selection of RF Power Source and Distribution Scheme at 352 MHz for Spoke Cavities at ESS and FREIA2012Report (Other academic)
    Abstract [en]

    The report describes selection of RF power source and distribution scheme for spoke cavities at ESS and FREIA.  The European Spallation Source (ESS) is the world’s most powerful neutron source, which contain 36 superconducting spoke cavities at 352MHz and provide power of 0.5MW to the beam. The baseline for the RF system is a point-to-point generation and distribution  from a single source to a single accelerating cavity.The RF system that has to generate this power and distribute it to the accelerating cavities, is a main resource driver for linear accelerators in form of investment, operation and maintenance. Therefore the technical alternatives are compared to minimize capital and running cost of the accelerator, without compromising its reliability. At 352 MHz and 350 kW RF power output, tetrode amplifiers are selected because of their advantages of being cheap, reliable, simple and efficient as compared to the other RF power amplifiers. The tetrodes, due to their low gain, need a pre-driver. The solid state amplifier technology is selected as a pre-driver due to its simplicity, reliability and efficiency. Half height aluminum WR2300 wave guides shall be used for RF distribution. This solution makes it possible to discard the circulator from the RF distribution chain, thus improving system efficiency.

  • 246604.
    Yohannes, Yemane
    Uppsala University, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Faculty of Social Sciences, Department of Economic History.
    The effect of foreign firms on Ethiopian economy upto the decline of feudalism in Ethiopia1976Independent thesis Basic level (degree of Bachelor)Student thesis
  • 246605.
    Yokota, H
    et al.
    Uppsala University.
    Forsberg, M
    Uppsala University.
    Asami, T
    Uppsala University.
    A new frame-based packet scheduling for variable-length packet switched networks - Architecture and performance analysis1999In: IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS, ISSN 0916-8532, Vol. E82D, no 4, p. 879-887Article in journal (Other scientific)
    Abstract [en]

    A new frame-based packet scheduling discipline designed for variable length packets is discussed. This algorithm extends a weighted round robin scheduling so that it can serve each queue fairly even if the length of packets varies. It can also handle burs

  • 246606.
    Yokota, H
    et al.
    Uppsala University.
    Forsberg, M
    Uppsala University.
    Asami, T
    Uppsala University.
    Extension to Weighted Round Robin packet scheduling for variable-length packet networks1999In: IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS, ISSN 0916-8532, Vol. E82D, no 3, p. 668-676Article in journal (Other scientific)
    Abstract [en]

    An extended version of weighted round robin scheduling algorithm for variable length packets is discussed. This can serve each flow fairly even if the length of packets varies. Further, an adaptive scheduling algorithm for bursty traffic is added to bette

  • 246607.
    Yokote, Koutaro
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine.
    Interactions between the platelet-derived growth factor receptors and their downstream signaling molecules1996Doctoral thesis, comprehensive summary (Other academic)
  • 246608. Yom-Tov, Yoram
    et al.
    Roos, Anna
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organism Biology, Environmental Toxicology.
    Mortensen, Peter
    Wiig, Øystein
    Yom-Tov, Shlomith
    Heggberget, Thrine M
    Recent changes in body size of the Eurasian otter Lutra lutra in Sweden.2010In: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, Vol. 39, no 7, p. 496-503Article in journal (Refereed)
    Abstract [en]

    We studied geographical and temporal body size trends among 169 adult museum specimens of the Eurasian otter (Lutra lutra) collected in Sweden between 1962 and 2008, whose sex, year of collection, and locality were known. Skull size and body mass increased significantly in relation to the year of collection, and skull size (but not body mass) was significantly and negatively related to latitude, contrasting Bergmann's rule and the trend found for Norwegian otters. Latitudinal differences in body size between the two countries may be due to differences in food availability. The temporal increase in body size among Swedish otters resembled that observed for Norway otters, though Swedish otters are smaller with respect to their Norwegian counterparts. Latitude and year represent a combination of environmental factors, including ambient temperature in the year of collection as well as the number of days of ice coverage. We replaced the above factors with mean annual temperature or the number of days of ice coverage, and found that each of these factors explains a similar proportion of the variation in body size as did latitude and year. We hypothesize that this temporal increase in body size is related to a combination of factors, including reduced energy expenditure resulting from increasing ambient temperature, and increased food availability from longer ice-free periods.

  • 246609.
    Yondt, Sabina
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Educational Sciences, Department of Education.
    Hedin, Charlotta
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Educational Sciences, Department of Education.
    En läroplanshistorisk undersökning av dramapedagogikens position i läroplanstexter.2013Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta examensarbete behandlar ämnet dramapedagogik och vilken funktion, position och status ämnet har haft i de läroplaner som utgivits från och med Läroplan för grundskolan 1962 (Lgr62). Materialet som undersökts är framför allt kapitlet Svenska i samtliga läroplaner, men även den allmänna delen och ett antal debattartiklar om ämnet drama i skolundervisning. Den tidigare forskningen som gjorts inom samma område är inte omfattande och berör inte ämnet ur vår vinkling, vilket gör vårt examensarbete relevant och spännande. Tidigare forskning visar att dramapedagogik i skolundervisning generellt har haft en låg position, både över tid och utanför Sverige. Samtidigt visar forskning hur gynnsamt drama i undervisning är för lärandet och att estetiska skolämnen fyller en funktion i dagens informationstäta samhälle, som stöd för att tolka och bearbeta all information som omvärlden ger oss.Som grund för arbetet har vi använt läroplansteori, eftersom det ger en förståelse över hur våra forskningsobjekt, läroplanstexterna, är uppbyggda. Vi använder oss av en kvalitativ textanalys, eftersom det ger större möjlighet att tolka texten jämfört med en kvantitativ textanalys, och vi intar ett diskursanalytiskt perspektiv då det ger en större förståelse för i vilket sammanhang dramapedagogik har befunnit sig i under olika tidsperioder.Vi har funnit ett antal funktioner som finns för att använda drama, och analyserat förekomsten av dessa funktioner i forskningsmaterialet, alltså läroplanstexterna och tidskrifterna. Uppsatsens resultat visar att dramapedagogik framför allt har haft en funktion av att stimulera lärandet, och att gynna lärandet i andra mer teoretiska skolämnen, samt har haft en resultatorienterad funktion. Dessa funktioner med drama har varit genomgående i alla läroplaner medan ett antal funktioner har dött ut i de två senaste läroplanerna. Dessa funktioner är drama som kommunikationsverktyg, drama som förmedlare av kulturarv och reproduktion, föreställningsförmåga och empati, samt den gruppstärkande funktionen. Sammantaget visar undersökningen att dramapedagogikens position har sänkts i de två senaste läroplanerna, jämfört med de tidigare läroplanerna.

  • 246610.
    Yonemura, Y.
    et al.
    Kusatsu Gen Hosp, Kishiwada Tokushukai Hosp, Peritoneal Surface Malignancy Ctr, Kishiwada, Shiga, Japan.;NPO Support Peritoneal Surface Malignancy Treatme, Osaka 6008189, Japan..
    Canbay, E.
    NPO Support Peritoneal Surface Malignancy Treatme, Osaka 6008189, Japan..
    Li, Y.
    Capital Med Univ, Beijin Shijitan Hosp, Dept Peritoneal Surface Oncol, Beijing 100038, Peoples R China..
    Coccolini, F.
    Gen Surg Papa Giovanni XXIII Hosp, Bergamo, Italy..
    Glehen, O.
    Univ Lyon, Ctr Hosp Lyon Sud, Dept Chirurg Gen, Hosp Civils Lyon, F-69495 Lyon, France..
    Sugarbaker, P. H.
    MedStar Washington Hosp Ctr, Ctr Gastrointestinal Malignancies, Program Peritoneal Surface Malignancies, Washington, DC 20010 USA..
    Morris, D.
    Univ New South Wales, St George Hosp, Dept Surg, Sydney, NSW 2052, Australia..
    Moran, B.
    Hampshire Hosp Fdn Trust, Peritoneal Malignancy Inst Basingstoke, Adelmaston Rd, Basingstoke RG24 9NA, Hants, England..
    Gonzaletz-Moreno, S.
    Univ Texas MD Anderson Canc Ctr, Dept Surg Oncol, Peritoneal Surface Oncol Program, Madrid, Spain..
    Deraco, M.
    Natl Canc Inst, Milan, Italy..
    Piso, P.
    Univ Regensburg, Teaching Hosp, Krankenhaus Barmherzige Brieder, Regensburg, Germany..
    Elias, D.
    Inst Gustave Roussy, Dept Chirurg Gen, Villejuif, France..
    Batlett, D.
    Hillman Canc Ctr, Div Surg Oncol, 5115 Ctr Ave, Pittsburgh, PA 15232 USA..
    Ishibashi, H.
    Kusatsu Gen Hosp, Kishiwada Tokushukai Hosp, Peritoneal Surface Malignancy Ctr, Kishiwada, Shiga, Japan..
    Mizumoto, A.
    Kusatsu Gen Hosp, Kishiwada Tokushukai Hosp, Peritoneal Surface Malignancy Ctr, Kishiwada, Shiga, Japan..
    Verwaal, V.
    Ziekenhuis Eindhoven, Oncol GE Chirurg, Eindhoven, Netherlands..
    Mahtem, Haile
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences.
    A comprehensive treatment for peritoneal metastases from gastric cancer with curative intent2016In: European Journal of Surgical Oncology, ISSN 0748-7983, E-ISSN 1532-2157, Vol. 42, no 8, p. 1123-1131Article, review/survey (Refereed)
    Abstract [en]

    Recently, Peritoneal Surface Oncology Group International (PSOGI) developed a novel comprehensive treatment consisting of cytoreductive surgery (CRS) and perioperative chemotherapy (POC) for the treatment of peritoneal metastases (PM) from gastric cancer with curative intent. This article reviews the results of this treatment and verifies its indication. In this strategy, peritoneal cancer index (PCI) is determined by laparoscopy, and a peritoneal port is placed. Neoadjuvant bidirectional intraperitoneal/systemic chemotherapy (NIPS) is performed for 3 cycles, and then laparotomy is performed. Cytoreductive surgery with peritonectomy procedures and hyperthermic intraperitoneal chemoperfusion (HIPEC) are performed. Multivariate analyses showed that completeness of cytoreduction, pathologic response to NIPS and PCI level and cytologic status after NIPS, as independent prognostic factors. PCI less than cut-off level after NIPS, negative cytology after NIPS, and positive response to NIPS were identified as the indications for comprehensive treatment. Patients who hold these criteria should be considered as the candidates for CRS and HIPEC.

  • 246611. Yong, D.
    et al.
    Norris, J. E.
    Bessell, M. S.
    Christlieb, N.
    Asplund, M.
    Beers, T. C.
    Barklem, Paul S.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Frebel, A.
    Ryan, S. G.
    The most metal-poor stars. II. Chemical abundances of 190 metal-poor stars including 10 new stars with [Fe/H] ≤ -3.52013In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 762, no 1, p. 26-Article in journal (Refereed)
    Abstract [en]

    We present a homogeneous chemical abundance analysis of 16 elements in 190 metal-poor Galactic halo stars (38 program and 152 literature objects). The sample includes 171 stars with [Fe/H] ≤ -2.5, of which 86 are extremely metal poor, [Fe/H] ≤ -3.0. Our program stars include 10 new objects with [Fe/H] ≤ -3.5. We identify a sample of "normal" metal-poor stars and measure the trends between [X/Fe] and [Fe/H], as well as the dispersion about the mean trend for this sample. Using this mean trend, we identify objects that are chemically peculiar relative to "normal" stars at the same metallicity. These chemically unusual stars include CEMP-no objects, one star with high [Si/Fe], another with high [Ba/Sr], and one with unusually low [X/Fe] for all elements heavier than Na. The Sr and Ba abundances indicate that there may be two nucleosynthetic processes at lowest metallicity that are distinct from the main r-process. Finally, for many elements, we find a significant trend between [X/Fe] versus T eff, which likely reflects non-LTE and/or three-dimensional effects. Such trends demonstrate that care must be exercised when using abundance measurements in metal-poor stars to constrain chemical evolution and/or nucleosynthesis predictions.

  • 246612. Yong, David
    et al.
    Norris, John E.
    Bessell, M. S.
    Christlieb, N.
    Asplund, M.
    Beers, Timothy C.
    Barklem, Paul S.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Frebel, Anna
    Ryan, S. G.
    The most metal-poor stars. III. The metallicity distribution function and carbon-enhanced metal-poor fraction2013In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 762, no 1, p. 27-Article in journal (Refereed)
    Abstract [en]

    We examine the metallicity distribution function (MDF) and fraction of carbon-enhanced metal-poor (CEMP) stars in a sample that includes 86 stars with [Fe/H] <= -3.0, based on high-resolution, high signal-to-noise spectroscopy, of which some 32 objects lie below [Fe/H] = -3.5. After accounting for the completeness function, the "corrected" MDF does not exhibit the sudden drop at [Fe/H] = -3.6 that was found in recent samples of dwarfs and giants from the Hamburg/ESO survey. Rather, the MDF decreases smoothly down to [Fe/H] = -4.1. Similar results are obtained from the "raw" MDF. We find that the fraction of CEMP objects below [Fe/H] = -3.0 is 23% +/- 6% and 32% +/- 8% when adopting the Beers & Christlieb and Aoki et al. CEMP definitions, respectively. The former value is in fair agreement with some previous measurements, which adopt the Beers & Christlieb criterion.

  • 246613.
    Yong, Huang
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology.
    A Hybrid Recommender: Study and implementation of course selection  recommender engine2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis project is a theoretical and practical study on recommender systems (RSs). It aims to help the planning of course selection for students from the Master Programme in Computer Science in Uppsala University. To achieve the goal, the project implements a recommender service, which generates course selection recommendations based on these three factors:     (i) student users’ preferences     (ii)  course requirements from the university     (iii) best practices from senior students The implementation of the recommender service takes these three approaches:      applying frequent-pattern mining techniques on senior students’ course selection data ,  performing semantic queries on a simple knowledge organization system (SKOS) taxonomy file that classifies computing disciplines, applying constraint programming (CP) techniques for problem modelling and resolving when generating final course selection recommendations     The recommender service is implemented as a representational state transfer (REST) compliant web service, i.e., a RESTful web service. The result shows that aforementioned factors have positive impact on the output of the service. Preliminary user feedback gives encouraging rating on the quality of the recommendations.     This report will talk about recommender systems, the semantic web, constraint programming and the implementation details of the recommender service. It focuses on in-depth discussion of recommender systems and the recommender service’s implementation. 

  • 246614.
    Yongtao, Yu
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Statistics.
    Exchange rate forecasting model comparison: A case study in North Europe2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In the past, a lot of studies about the comparison of exchange rate forecasting models have been carried out. Most of these studies have a similar result which is the random walk model has the best forecasting performance. In this thesis, I want to find a model to beat the random walk model in forecasting the exchange rate. In my study, the vector autoregressive model (VAR), restricted vector autoregressive model (RVAR), vector error correction model (VEC), Bayesian vector autoregressive model are employed in the analysis. These multivariable time series models are compared with the random walk model by evaluating the forecasting accuracy of the exchange rate for three North European countries both in short-term and long-term. For short-term, it can be concluded that the random walk model has the best forecasting accuracy. However, for long-term, the random walk model is beaten. The equal accuracy test proves this phenomenon really exists.

  • 246615. Yoon, Chun Hong
    et al.
    Schwander, Peter
    Abergel, Chantal
    Andersson, Inger
    Andreasson, Jakob
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology, Molecular biophysics.
    Aquila, Andrew
    Bajt, Sasa
    Barthelmess, Miriam
    Barty, Anton
    Bogan, Michael J.
    Bostedt, Christoph
    Bozek, John
    Chapman, Henry N.
    Claverie, Jean-Michel
    Coppola, Nicola
    DePonte, Daniel P.
    Ekeberg, Tomas
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology, Molecular biophysics.
    Epp, Sascha W.
    Erk, Benjamin
    Fleckenstein, Holger
    Foucar, Lutz
    Graafsma, Heinz
    Gumprecht, Lars
    Hajdu, Janos
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology, Molecular biophysics.
    Hampton, Christina Y.
    Hartmann, Andreas
    Hartmann, Elisabeth
    Hartmann, Robert
    Hauser, Gunter
    Hirsemann, Helmut
    Holl, Peter
    Kassemeyer, Stephan
    Kimmel, Nils
    Kiskinova, Maya
    Liang, Mengning
    Loh, Ne-Te Duane
    Lomb, Lukas
    Maia, Filipe R. N. C.
    Martin, Andrew V.
    Nass, Karol
    Pedersoli, Emanuele
    Reich, Christian
    Rolles, Daniel
    Rudek, Benedikt
    Rudenko, Artem
    Schlichting, Ilme
    Schulz, Joachim
    Seibert, Marvin
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology, Molecular biophysics.
    Seltzer, Virginie
    Shoeman, Robert L.
    Sierra, Raymond G.
    Soltau, Heike
    Starodub, Dmitri
    Steinbrener, Jan
    Stier, Gunter
    Strueder, Lothar
    Svenda, Martin
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology, Molecular biophysics.
    Ullrich, Joachim
    Weidenspointner, Georg
    White, Thomas A.
    Wunderer, Cornelia
    Ourmazd, Abbas
    Unsupervised classification of single-particle X-ray diffraction snapshots by spectral clustering2011In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 19, no 17, p. 16542-16549Article in journal (Refereed)
    Abstract [en]

    Single-particle experiments using X-ray Free Electron Lasers produce more than 10(5) snapshots per hour, consisting of an admixture of blank shots (no particle intercepted), and exposures of one or more particles. Experimental data sets also often contain unintentional contamination with different species. We present an unsupervised method able to sort experimental snapshots without recourse to templates, specific noise models, or user-directed learning. The results show 90% agreement with manual classification.

  • 246616. Yoon, Chun Hong
    et al.
    Schwander, Peter
    Abergel, Chantal
    Andersson, Inger
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology.
    Andreasson, Jakob
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology.
    Aquila, Andrew
    Bajt, Saša
    Barthelmess, Miriam
    Barty, Anton
    Bogan, Michael J
    Bostedt, Christoph
    Bozek, John
    Chapman, Henry N
    Claverie, Jean-Michel
    Coppola, Nicola
    DePonte, Daniel P
    Ekeberg, Tomas
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology.
    Epp, Sascha W
    Erk, Benjamin
    Fleckenstein, Holger
    Foucar, Lutz
    Graafsma, Heinz
    Gumprecht, Lars
    Hajdu, Janos
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology.
    Hampton, Christina Y
    Hartmann, Andreas
    Hartmann, Elisabeth
    Hartmann, Robert
    Hauser, Gunter
    Hirsemann, Helmut
    Holl, Peter
    Kassemeyer, Stephan
    Kimmel, Nils
    Kiskinova, Maya
    Liang, Mengning
    Loh, Ne-Te Duane
    Lomb, Lukas
    Maia, Filipe R N C
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology.
    Martin, Andrew V
    Nass, Karol
    Pedersoli, Emanuele
    Reich, Christian
    Rolles, Daniel
    Rudek, Benedikt
    Rudenko, Artem
    Schlichting, Ilme
    Schulz, Joachim
    Seibert, Marvin
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology.
    Seltzer, Virginie
    Shoeman, Robert L
    Sierra, Raymond G
    Soltau, Heike
    Starodub, Dmitri
    Steinbrener, Jan
    Stier, Gunter
    Strüder, Lothar
    Svenda, Martin
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology.
    Ullrich, Joachim
    Weidenspointner, Georg
    White, Thomas A
    Wunderer, Cornelia
    Ourmazd, Abbas
    Unsupervised classification of single-particle X-ray diffraction snapshots by spectral clustering.2011In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 19, no 17, p. 15929-15936Article in journal (Refereed)
    Abstract [en]

    Single-particle experiments using X-ray Free Electron Lasers produce more than 10(5) snapshots per hour, consisting of an admixture of blank shots (no particle intercepted), and exposures of one or more particles. Experimental data sets also often contain unintentional contamination with different species. We present an unsupervised method able to sort experimental snapshots without recourse to templates, specific noise models, or user-directed learning. The results show 90% agreement with manual classification.

  • 246617. Yoon, G.
    et al.
    Baskin, Berivan
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medical Genetics.
    Tarnopolsky, M.
    Boycott, K. M.
    Geraghty, M. T.
    Sell, E.
    Goobie, S.
    Meschino, W.
    Banwell, B.
    Ray, P. N.
    Autosomal recessive hereditary spastic paraplegia: clinical and genetic characteristics of a well-defined cohort2013In: Neurogenetics, ISSN 1364-6745, E-ISSN 1364-6753, Vol. 14, no 3-4, p. 181-188Article in journal (Refereed)
    Abstract [en]

    We describe the clinical and genetic features of a well-characterized cohort of patients with autosomal recessive hereditary spastic paraplegia (ARHSP) in the province of Ontario. Patients with documented corticospinal tract abnormalities were screened by whole gene sequencing and multiplex ligation probe amplification for mutations in nine genes known to cause ARHSP. Of a cohort of 39 patients, a genetic diagnosis was established in 17 (44 %) and heterozygous mutations were detected in 8 (21 %). Mutations were most frequent in SPG7 (12 patients), followed by SPG11 (10 patients), PNPLA6 (SPG39, 2 patients), and ZFYVE26 (SPG15, 2 patients). Although there are associations between some clinical manifestations of ARHSP and specific genes, many patients are tested at an early stage of the disease when phenotype/genotype correlations are not obvious. Accurate molecular characterization of well-phenotyped cohorts of patients will be essential to establishing the natural history of these rare degenerative disorders to enable future clinical trials.

  • 246618. Yoon, Y.
    et al.
    Kang, M. -G
    Morimoto, T.
    Kida, M.
    Aoki, N.
    Reno, J. L.
    Ochiai, Y.
    Mourokh, L.
    Fransson, Jonas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
    Bird, J. P.
    Coupling Quantum States through a Continuum: A Mesoscopic Multistate Fano Resonance2012In: PHYS REV X, ISSN 2160-3308, Vol. 2, no 2, p. 021003-Article in journal (Refereed)
    Abstract [en]

    We demonstrate a fully tunable realization of a multistate Fano resonance, in which a pair of remote quantum states experience an effective coupling due to their mutual overlap with a continuum. Our mesoscopic implementation of this system exploits the ability of the semiconductor nanostructures known as quantum point contacts (QPCs) to serve, in the low-density limit close to pinch-off, as an on-demand localized state. By coupling the states formed on two separate QPCs, through a two-dimensional electron gas that serves as a continuum, we observe a robust effective interaction between the QPCs. To explain this result, we develop a theoretical formulation, based on the ideas of the Schrieffer-Wolff transformation, which is able to reproduce our key experimental findings. According to this model, the robust character of the interaction between the two remote states arises from the fact that the interaction is essentially mediated by a large number of degenerate continuum states. While the continuum is often viewed as a source of decoherence, our experiment therefore instead suggests the possibility of using this medium to support the interaction of quantum states, a result that may allow new approaches to coherently couple nanostructures in extended geometries.

  • 246619. Yopak, Kara E.
    et al.
    Lisney, Thomas J.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal Ecology.
    Darlington, Richard B.
    Collin, Shaun P.
    Montgomery, John C.
    Finlay, Barbara L.
    A conserved pattern of brain scaling from sharks to primates2010In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 107, no 29, p. 12946-12951Article in journal (Refereed)
    Abstract [en]

    Several patterns of brain allometry previously observed in mammals have been found to hold for sharks and related taxa (chondrichthyans) as well. In each clade, the relative size of brain parts, with the notable exception of the olfactory bulbs, is highly predictable from the total brain size. Compared with total brain mass, each part scales with a characteristic slope, which is highest for the telencephalon and cerebellum. In addition, cerebellar foliation reflects both absolute and relative cerebellar size, in a manner analogous to mammalian cortical gyrification. This conserved pattern of brain scaling suggests that the fundamental brain plan that evolved in early vertebrates permits appropriate scaling in response to a range of factors, including phylogeny and ecology, where neural mass may be added and subtracted without compromising basic function.

  • 246620.
    Yordanova, Emiliya
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Balogh, A.
    Noullez, A.
    von Steiger, R.
    Turbulence and intermittency in the heliospheric magnetic field in fast and slow solar wind2009In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 114, no 8, p. A08101-Article in journal (Refereed)
    Abstract [en]

    We study the nonuniform solar wind turbulence using high-resolution Ulysses magnetic field data measured at different solar activity level, heliospheric latitudes, and distance. We define several types of solar wind dependent of the coronal region of origin and also of the dynamical behavior of the different streams, namely, "pure'' fast wind, fast streams, "pure'' slow wind, and slow streams. The turbulent properties of the solar wind types were investigated in terms of their scaling properties and spatial inhomogeneity. A clear trend in the power spectrum of the solar wind magnetic field magnitude is observed: the "pure'' fast wind has a slope similar to-1.33 (1/f-like), the fast streams similar to-1.48 (Kraichnan-like), the "pure'' slow wind similar to-1.67 (Kolmogorov-like), and the slow streams similar to-1.72. We find that the "pure'' fast wind in the polar heliolatitudes is less intermittent than the other types: "pure'' slow wind and both slow and fast streams, which is because of the absence of dynamical interactions between streams with different speeds. On the other hand, fast streams are more intermittent than the "pure'' fast wind, and slow streams are less intermittent than the "pure'' slow winds. A clear radial and latitudinal evolution of the intermittency is observed only for the "pure'' fast wind, while in the equatorial plane, the fast streams, the "pure'' slow wind, and the slow streams do not show evolution either in heliolatitude or in heliocentric distance.

  • 246621.
    Yordanova, Emiliya
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Space Plasma Physics.
    Bergman, Jan E.S.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Space Plasma Physics.
    Stasiewicz, Kristof
    Anisotropic turbulence and complexity in magnetospheric-cusp: a case study.2005In: Nonlin. Proc. Geophys., Vol. 12, p. 817-825Article in journal (Refereed)
  • 246622.
    Yordanova, Emiliya
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Perri, S.
    Carbone, V.
    Reduced magnetic helicity behavior in different plasma regions of near-Earth space2011In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 116, p. A07230-Article in journal (Refereed)
    Abstract [en]

    We present a comparative study of the scaling laws of a signed measure calculated from the reduced magnetic helicity from Cluster observations in three different near-Earth plasma regions: solar wind, foreshock, and magnetosheath. The reduced magnetic helicity provides information about the handedness of the magnetic field, which can be related to the polarization (left or right) of the magnetic fluctuations, once the direction of propagation with respect to the mean magnetic field is known. We have found similar scaling properties of the reduced magnetic helicity in the solar wind and the magnetosheath; namely, there is no scale dependence at high frequency and cancellations between both polarizations continue beyond the ion cyclotron frequency. On other hand, in the foreshock we observe the prevalence of one sign of polarization, due to the presence of right-handed high-frequency waves in the plasma frame. We interpret the results in terms of the different variability in the plasma parameters and properties in the three plasma regions.

  • 246623.
    Yordanova, Emiliya
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Perri, S.
    Sorriso-Valvo, L.
    Carbone, V.
    Multipoint observation of anisotropy and intermittency in solar-wind turbulence2015In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 110, no 1, article id 19001Article in journal (Refereed)
    Abstract [en]

    Using high-resolution magnetic-field Cluster observations, we have investigated the magnetic-field anisotropy via the second-and fourth-order structure functions over a wide range of scales reaching below the subproton scale. The magnetic-field increments have been computed from single-and two-spacecraft measurements. The two-satellite technique allows us to study the increments as a function of an actual space lag. Both single-and two-point analyses show that the magnetic field is anisotropic even at small time/spatial scales. The single-spacecraft data also shows that the degree of anisotropy does not change with the scale at proton and subproton scales. It is also pointed out that the degree of magnetic-field anisotropy tends to be overestimated in the single-spacecraft data analysis. This is particularly evident at small scales and it depends on the angle between the spacecraft separation and the flow direction. From the fourth-order moment of the probability density function of the magnetic-field increments we have also investigated the presence of intermittency in the fluctuations. Even though to a different degree, intermittency was present over the entire range of scales, with an indication of scale invariance at subproton scales.

  • 246624.
    Yordanova, Emiliya
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Sundkvist, D.
    Buchert, Stephan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    André, Mats
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Ogawa, Y.
    Morooka, Michiko
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Margithu, O.
    Amm, O.
    Fazakerley, A. N.
    Réme, H.
    Energy input from the exterior cusp into the ionosphere: Correlated ground-based and satellite observations2007In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 34, no 4, p. L04102-Article in journal (Refereed)
    Abstract [en]

    The energy transport from the exterior cusp into the ionosphere is investigated using coordinated ground-based (EISCAT and MIRACLE) and satellite ( Cluster) observations. EISCAT and MIRACLE data are used to estimate the plasma heating in the F-region and the Joule heating in the E-region. Cluster measurements are used to derive the electromagnetic and particle energy fluxes at the high altitudes. These fluxes are then compared with the energy deposition into the ionospheric cusp during a 30 minutes long time interval in which Cluster and EISCAT are nearly conjugated. It is shown that the particles seen at about 9 Re in the exterior cusp carry an earthward energy flux that corresponds to the observed heating of the F-region. The estimated earthward Poynting flux is more than enough to account for the Joule heating in the E-region.

  • 246625.
    Yordanova, Emiliya
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Vaivads, Andris
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    André, Mats
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Buchert, Stephan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Voeroes, Z.
    Magnetosheath plasma turbulence and its spatiotemporal evolution as observed by the Cluster spacecraft2008In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 100, no 20, p. 205003-Article in journal (Refereed)
    Abstract [en]

    We study the plasma turbulence, at scales larger than the ion inertial length scale, downstream of a quasiparallel bow shock using Cluster multispacecraft measurements. We show that turbulence is intermittent and well described by the extended structure function model, which takes into account the spatial inhomogeneity of the cascade rate. For the first time we use multispacecraft observations to characterize the evolution of magnetosheath turbulence, particularly its intermittency, as a function of the distance from the bow shock. The intermittency significantly changes over the distance of the order of 100 ion inertial lengths, being increasingly stronger and anisotropic away from the bow shock.

  • 246626.
    Yordanova, Emiliya
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Voros, Z.
    Austrian Acad Sci, Space Res Inst, Graz, Austria.;Eotvos Lorand Univ, Dept Geophys & Space Sci, Budapest, Hungary.;Hungarian Acad Sci, Geodet & Geophys Inst, RCAES, Sopron, Hungary..
    Varsani, A.
    Austrian Acad Sci, Space Res Inst, Graz, Austria..
    Graham, Daniel B.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Norgren, Cecilia
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Khotyaintsev, Yuri V.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Vaivads, Andris
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Eriksson, Elin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Nakamura, R.
    Austrian Acad Sci, Space Res Inst, Graz, Austria..
    Lindqvist, P. -A
    Marklund, G.
    Royal Inst Technol, Space & Plasma Grp, Stockholm, Sweden..
    Ergun, R. E.
    Univ Colorado, Atmospher & Space Phys Lab, Campus Box 392, Boulder, CO 80309 USA..
    Magnes, W.
    Austrian Acad Sci, Space Res Inst, Graz, Austria..
    Baumjohann, W.
    Austrian Acad Sci, Space Res Inst, Graz, Austria..
    Fischer, D.
    Austrian Acad Sci, Space Res Inst, Graz, Austria..
    Plaschke, F.
    Austrian Acad Sci, Space Res Inst, Graz, Austria..
    Narita, Y.
    Austrian Acad Sci, Space Res Inst, Graz, Austria..
    Russell, C. T.
    Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA..
    Strangeway, R. J.
    Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA..
    Le Contel, O.
    Univ Paris 11, UPMC, Observ Paris, Lab Phys Plasmas,CNRS,Ecole Polytech, Paris, France..
    Pollock, C.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD USA..
    Torbert, R. B.
    Southwest Res Inst, San Antonio, TX USA..
    Giles, B. J.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD USA..
    Burch, J. L.
    Southwest Res Inst, San Antonio, TX USA..
    Avanov, L. A.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD USA..
    Dorelli, J. C.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD USA..
    Gershman, D. J.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.;Univ Maryland, Dept Astron, College Pk, MD 20742 USA..
    Paterson, W. R.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD USA..
    Lavraud, B.
    CNRS, IRAP, Toulouse, France.;CNRS, Toulouse, France..
    Saito, Y.
    JAXA, Tokyo, Japan..
    Electron scale structures and magnetic reconnection signatures in the turbulent magnetosheath2016In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 43, no 12, p. 5969-5978Article in journal (Refereed)
    Abstract [en]

    Collisionless space plasma turbulence can generate reconnecting thin current sheets as suggested by recent results of numerical magnetohydrodynamic simulations. The Magnetospheric Multiscale (MMS) mission provides the first serious opportunity to verify whether small ion-electron-scale reconnection, generated by turbulence, resembles the reconnection events frequently observed in the magnetotail or at the magnetopause. Here we investigate field and particle observations obtained by the MMS fleet in the turbulent terrestrial magnetosheath behind quasi-parallel bow shock geometry. We observe multiple small-scale current sheets during the event and present a detailed look of one of the detected structures. The emergence of thin current sheets can lead to electron scale structures. Within these structures, we see signatures of ion demagnetization, electron jets, electron heating, and agyrotropy suggesting that MMS spacecraft observe reconnection at these scales.

  • 246627.
    Yordkayhun, Sawasdee
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
    2D and 3D Seismic Surveying at the CO2SINK Project Site, Ketzin, Germany: The Potential for Imaging the Shallow Subsurface2008Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Seismic traveltime inversion, traveltime tomography and seismic reflection techniques have been applied for two dimensional (2D) and three dimensional (3D) data acquired in conjunction with site characterization and monitoring aspects at a carbon dioxide (CO2) geological storage site at Ketzin, Germany (the CO2SINK project). Conventional seismic methods that focused on investigating the CO2 storage and caprock formations showed a poor or no image of the upper 150 m. In order to fill this information gap, an effort on imaging the shallow subsurface at a potentially risky area at the site is the principal goal of this thesis.

    Beside this objective, a seismic source comparison from a 2D pilot study for acquisition parameter testing at the site found a weight drop source suitable with respect to the signal penetration, frequency content of the data and minimizing time and cost for 3D data acquisition.

    For the Ketzin seismic data, the ability to obtain high-quality images is limited by the acquisition geometry, source-generated noise and time shifts due to near-surface effects producing severe distortions in the data. Moreover, these time shifts are comparable to the dominant periods of the reflections and to the size of structures to be imaged. Therefore, a combination of seismic refraction and state-of-the-art processing techniques, including careful static corrections and more accurate velocity analysis, resulted in key improvements of the images and allowed new information to be extracted. The results from these studies together with borehole information, hydrogeologic models and seismic modeling have been combined into an integrated interpretation. The boundary between the Quaternary and Tertiary unit has been mapped. The internal structure of the Quaternary sediments is likely to be complicated due to the shallow aquifer/aquitard complex, whereas the heterogeneity in the Tertiary unit is due to rock alteration associated with fault zones. Some of the major faults appear to project into the Tertiary unit. These findings are important for understanding the potentially risky anticline crest and can be used as a database for the future monitoring program at the site.

    List of papers
    1. Comparison of surface seismic sources at the CO2SINK site, Ketzin, Germany
    Open this publication in new window or tab >>Comparison of surface seismic sources at the CO2SINK site, Ketzin, Germany
    Show others...
    2009 (English)In: Geophysical Prospecting, ISSN 0016-8025, E-ISSN 1365-2478, Vol. 57, no 1, p. 125-139Article in journal (Refereed) Published
    Abstract [en]

    In 2004 three seismic surface sources (VIBSIST, accelerated weight drop and MiniVib) were tested in a pilot study at the Ketzin test site, Germany, a study site for geological storage of CO2 (EU project CO2SINK). The main objectives of this pilot study were to 1) evaluate the response of the Ketzin site to reflection seismics, especially at the planned injection depth, 2) test different acquisition parameters and 3) use the results to guide the planning of the 3D survey. As part of these objectives, we emphasize the source performance comparison in this study. The sources were tested along two perpendicular lines of 2.4 km length each. Data were acquired by shooting at all stations (source and receiver spacing of 20 m) on both lines, allowing common-midpoint stacked sections to be produced. The sources' signal characteristics based on signal-to-noise ratio, signal penetration and frequency content of raw shot records were analysed and stacked sections were compared. The results show that all three surface sources are suitable for reflection seismic studies down to a depth of about 1 km and provide enough bandwidth for resolving the geological targets at the site, i.e., the Weser and Stuttgart Formations. Near surface conditions, especially a thick weathering layer present in this particular area, strongly influence the data quality, as indicated by the difference in reflectivity and signal-to-noise ratio of the two common-midpoint lines. The stacked sections of the MiniVib source show the highest frequency signals down to about 500 ms traveltime (approximately 500 m depth) but also the shallowest signal penetration depth. The VIBSIST source generates signals with the highest signal-to-noise ratio and greatest signal penetration depth of the tested sources. In particular, reflections below 900 ms (approximately 1 km depth) are best imaged by the VIBSIST source. The weight drop performance lies in between these two sources and might be recommended as an appropriate source for a 3D survey at this site because of the shorter production time compared to the VIBSIST and MiniVib sources.

    National Category
    Earth and Related Environmental Sciences
    Identifiers
    urn:nbn:se:uu:diva-97518 (URN)10.1111/j.1365-2478.2008.00737.x (DOI)000261447600010 ()
    Available from: 2008-09-05 Created: 2008-09-05 Last updated: 2017-12-14Bibliographically approved
    2. Shallow velocity–depth model using first arrival traveltime inversion at the CO2SINK site, Ketzin, Germany
    Open this publication in new window or tab >>Shallow velocity–depth model using first arrival traveltime inversion at the CO2SINK site, Ketzin, Germany
    2007 (English)In: Journal of Applied Geophysics, ISSN 0926-9851, E-ISSN 1879-1859, Vol. 63, no 2, p. 68-79Article in journal (Refereed) Published
    Abstract [en]

    The CO2SINK project, a carbon dioxide storage and monitoring project, has been in operation in the Ketzin area, Germany since 2004. Goals are to investigate the techniques and understand the processes related to geological storage of CO2 in a saline aquifer. A key element of the project is comprehensive monitoring and the development of verification methods to track the long term spread of the injected CO2. Time lapse seismic surveys in 3D and 2D are important monitoring components for tracking the movement of CO2. Prior to the 3D baseline seismic survey in 2005, a pilot seismic survey was performed in 2004 in order to provide input parameters for the 3D survey and information on target depth. This pilot study, consisting of two perpendicular 2.4 km long profiles confirmed the geological structure based on 1960s vintage seismic data. However, the image is rather poor in the uppermost parts of the seismic sections. In order to obtain additional structural information and to improve the velocity function estimates, first arrival traveltimes were used to image the near-surface structure and to provide an improved velocity function for interpretation of reflection data. We used a generalized linear inversion (GLI) method, based on iterative least-squares inversion, to reconstruct the velocity–depth model. A simple and smooth starting velocity model was derived from traveltime plots and the stacked reflection seismic sections. Reliability of the resulting velocity models were estimated from analysis of the traveltime residuals (RMS error) and qualitative analysis of ray coverage. There appears to be a good correlation of layer boundaries in our model and higher amplitude reflections observed on the stacked sections. Comparison of the seismic depth sections computed using stacking velocities with the GLI inverted velocity shows that the depth sections obtained from the latter agrees better with the velocity models. The combination of borehole data and the depth converted stacked sections provides key constraints for interpretation of the velocity models. The estimated investigation depth of the seismic profiles is on the order of 400 m with rays penetrating the surface cover and sedimentary sequences. These sedimentary rocks are characterized by a gradual increase in the velocity field with depth without strong contrasts and insignificant lateral velocity variations.

    Keywords
    Traveltime inversion, Generalized linear inversion, Velocity–depth model, CO2SINK project
    National Category
    Earth and Related Environmental Sciences
    Identifiers
    urn:nbn:se:uu:diva-97519 (URN)10.1016/j.jappgeo.2007.05.001 (DOI)000250767700002 ()
    Available from: 2008-09-05 Created: 2008-09-05 Last updated: 2017-12-14Bibliographically approved
    3. 3D seismic traveltime tomography imaging of the shallow subsurface at the CO2SINK project site, Ketzin, Germany
    Open this publication in new window or tab >>3D seismic traveltime tomography imaging of the shallow subsurface at the CO2SINK project site, Ketzin, Germany
    Show others...
    2009 (English)In: Geophysics, ISSN 0016-8033, E-ISSN 1942-2156, Vol. 74, no 1, p. G1-G15Article in journal (Refereed) Published
    Abstract [en]

    A 3D reflection seismic survey was performed in 2005 at the Ketzin carbon dioxide (CO2) pilot geological-storage site (the CO2SINK project) near Berlin, Germany, to image the geological structure of the site to depths of about 1 km. Because of the acquisition geometry, frequency limitations of the source, and artefacts of the data processing, detailed structures shallower than about 150 m were unclear. To obtain structural images of the shallow subsurface, we applied 3D traveltime tomography to data near the top of the Ketzin anticline, where faulting is present. Understanding the shallow subsurface structure is important for long-term monitoring aspects of the project after CO2 has been injected into a saline aquifer at about 650-m depth. We used a 3D traveltime tomography algorithm based on a combination of solving for 3D velocity structure and static corrections in the inversion process to account for artefacts in the velocity structure because of smearing effects from the unconsolidated cover. The resulting velocity model shows low velocities of 800 1200 m/s in the uppermost shallow subsurface of the study area. The velocity reaches about 1800 m/s at a depth of 60-80 m. This coincides approximately with the boundary between Quaternary units, which contain the near-surface freshwater reservoir and the Tertiary clay aquitard. Correlation of tomographic images with a similarity attribute slice at 150 ms (about 150-m depth) indicates that at least one east-west striking fault zone observed in the reflection data might extend into the Tertiary unit. The more detailed images of the shallow subsurface from this study provided valuable information on this potentially risky area.

    National Category
    Earth and Related Environmental Sciences
    Identifiers
    urn:nbn:se:uu:diva-97520 (URN)10.1190/1.3026553 (DOI)000264521900017 ()
    Available from: 2008-09-05 Created: 2008-09-05 Last updated: 2017-12-14Bibliographically approved
    4. 3D seismic reflection surveying at the CO2SINK project site, Ketzin, Germany: A study for extracting shallow subsurface information
    Open this publication in new window or tab >>3D seismic reflection surveying at the CO2SINK project site, Ketzin, Germany: A study for extracting shallow subsurface information
    2009 (English)In: Near Surface Geophysics, ISSN 1569-4445, E-ISSN 1873-0604, ISSN 1569-4445, Vol. 7, no 2, p. 75-91Article in journal (Refereed) Published
    Abstract [en]

    Three-dimensional (3D) reflection seismic data were recorded as part of a pilot scale carbon dioxide (CO2) geological storage project (CO2 SINK) with the aim of mapping the structural geometry of the site and providing a 3D baseline prior to CO2 injection. Standard processing  originally focused on the storage target, a saline aquifer at 500-700 m  depth and successful imaged coherent reflections from 150 ms to 900 ms in the seismic volume. However, the relatively sparse distribution of sources and receivers, the frequency content of the data and artefacts   of the processing resulted in the uppermost 150 ms being poorly   resolved. This depth range contains caprock, shallow faults and an aquifer system. Thus, characterizing the shallow subsurface is important in terms of site delineation of potential leakage paths and monitoring after CO2 injection. In order to study the potential of   mapping the uppermost reflectors and shallow structures associated with  major fault zones, a comprehensive reprocessing effort on a subset of the 3D data was performed. The challenge in imaging shallow reflections is dependent upon the separation of ground roll and refracted energy   from the reflected energy, as well as compensation for time shifts due   to statics. Among the processing sequences, refraction static corrections, careful muting and filtering, velocity analysis and 3D   time migration were key steps for enhancing the resolution and   coherency of shallow seismic reflections. This study images a  previously unmapped horizon, close to the Quaternary-Tertiary boundary, at about 95-120 ms (similar to 65-90 m depth). Correlation of lateral variations in reflectivity along this boundary, lateral velocity   variations in the tomographic image and the seismic signature in   modelling studies suggest an aquifer/aquitard complex and variable   lithology with associated localized silty or clayey sediments,   overlying the Tertiary Rupelton clay unit. In the previous processing   it was not clear if the deeper faults imaged on the 3D seismic survey   extended to shallower levels than the base Tertiary. Thus, a   comprehensive fault detection technique, multi-attributes and neural networks analysis, was employed in this study to allow a more reliable  fault geometry to be interpreted. Tracking of faults in the seismic   image and comparisons with a tomography study indicate that some deeper faults may penetrate into the overlying Tertiary unit. These findings are important for understanding potentially risky areas and can be used as a database for future monitoring programmes at the site.

    Keywords
    CO2 STORAGE; DEPTH CHARACTERIZATION; P-WAVE; VELOCITY; AQUIFERS; SLEIPNER; ROCK; ACQUISITION; SEDIMENTS; PHYSICS
    National Category
    Earth and Related Environmental Sciences
    Identifiers
    urn:nbn:se:uu:diva-97521 (URN)10.3997/1873-0604.2008036 (DOI)000266452500001 ()
    Available from: 2008-09-05 Created: 2008-09-05 Last updated: 2017-12-14Bibliographically approved
  • 246628.
    Yordkayhun, Sawasdee
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Ivanova, Alexandra
    GeoForschungsZentrum (GFZ), Potsdam, Germany.
    Giese, Ruediger
    Juhlin, Christopher
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
    Cosma, Calin
    Comparison of surface seismic sources at the CO2SINK site, Ketzin, Germany2009In: Geophysical Prospecting, ISSN 0016-8025, E-ISSN 1365-2478, Vol. 57, no 1, p. 125-139Article in journal (Refereed)
    Abstract [en]

    In 2004 three seismic surface sources (VIBSIST, accelerated weight drop and MiniVib) were tested in a pilot study at the Ketzin test site, Germany, a study site for geological storage of CO2 (EU project CO2SINK). The main objectives of this pilot study were to 1) evaluate the response of the Ketzin site to reflection seismics, especially at the planned injection depth, 2) test different acquisition parameters and 3) use the results to guide the planning of the 3D survey. As part of these objectives, we emphasize the source performance comparison in this study. The sources were tested along two perpendicular lines of 2.4 km length each. Data were acquired by shooting at all stations (source and receiver spacing of 20 m) on both lines, allowing common-midpoint stacked sections to be produced. The sources' signal characteristics based on signal-to-noise ratio, signal penetration and frequency content of raw shot records were analysed and stacked sections were compared. The results show that all three surface sources are suitable for reflection seismic studies down to a depth of about 1 km and provide enough bandwidth for resolving the geological targets at the site, i.e., the Weser and Stuttgart Formations. Near surface conditions, especially a thick weathering layer present in this particular area, strongly influence the data quality, as indicated by the difference in reflectivity and signal-to-noise ratio of the two common-midpoint lines. The stacked sections of the MiniVib source show the highest frequency signals down to about 500 ms traveltime (approximately 500 m depth) but also the shallowest signal penetration depth. The VIBSIST source generates signals with the highest signal-to-noise ratio and greatest signal penetration depth of the tested sources. In particular, reflections below 900 ms (approximately 1 km depth) are best imaged by the VIBSIST source. The weight drop performance lies in between these two sources and might be recommended as an appropriate source for a 3D survey at this site because of the shorter production time compared to the VIBSIST and MiniVib sources.

  • 246629.
    Yordkayhun, Sawasdee
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Juhlin, Christopher
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Giese, Ruediger
    Cosma, Calin
    Shallow velocity–depth model using first arrival traveltime inversion at the CO2SINK site, Ketzin, Germany2007In: Journal of Applied Geophysics, ISSN 0926-9851, E-ISSN 1879-1859, Vol. 63, no 2, p. 68-79Article in journal (Refereed)
    Abstract [en]

    The CO2SINK project, a carbon dioxide storage and monitoring project, has been in operation in the Ketzin area, Germany since 2004. Goals are to investigate the techniques and understand the processes related to geological storage of CO2 in a saline aquifer. A key element of the project is comprehensive monitoring and the development of verification methods to track the long term spread of the injected CO2. Time lapse seismic surveys in 3D and 2D are important monitoring components for tracking the movement of CO2. Prior to the 3D baseline seismic survey in 2005, a pilot seismic survey was performed in 2004 in order to provide input parameters for the 3D survey and information on target depth. This pilot study, consisting of two perpendicular 2.4 km long profiles confirmed the geological structure based on 1960s vintage seismic data. However, the image is rather poor in the uppermost parts of the seismic sections. In order to obtain additional structural information and to improve the velocity function estimates, first arrival traveltimes were used to image the near-surface structure and to provide an improved velocity function for interpretation of reflection data. We used a generalized linear inversion (GLI) method, based on iterative least-squares inversion, to reconstruct the velocity–depth model. A simple and smooth starting velocity model was derived from traveltime plots and the stacked reflection seismic sections. Reliability of the resulting velocity models were estimated from analysis of the traveltime residuals (RMS error) and qualitative analysis of ray coverage. There appears to be a good correlation of layer boundaries in our model and higher amplitude reflections observed on the stacked sections. Comparison of the seismic depth sections computed using stacking velocities with the GLI inverted velocity shows that the depth sections obtained from the latter agrees better with the velocity models. The combination of borehole data and the depth converted stacked sections provides key constraints for interpretation of the velocity models. The estimated investigation depth of the seismic profiles is on the order of 400 m with rays penetrating the surface cover and sedimentary sequences. These sedimentary rocks are characterized by a gradual increase in the velocity field with depth without strong contrasts and insignificant lateral velocity variations.

  • 246630.
    Yordkayhun, Sawasdee
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Juhlin, Christopher
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Norden, Ben
    3D seismic reflection surveying at the CO2SINK project site, Ketzin, Germany: A study for extracting shallow subsurface information2009In: Near Surface Geophysics, ISSN 1569-4445, E-ISSN 1873-0604, ISSN 1569-4445, Vol. 7, no 2, p. 75-91Article in journal (Refereed)
    Abstract [en]

    Three-dimensional (3D) reflection seismic data were recorded as part of a pilot scale carbon dioxide (CO2) geological storage project (CO2 SINK) with the aim of mapping the structural geometry of the site and providing a 3D baseline prior to CO2 injection. Standard processing  originally focused on the storage target, a saline aquifer at 500-700 m  depth and successful imaged coherent reflections from 150 ms to 900 ms in the seismic volume. However, the relatively sparse distribution of sources and receivers, the frequency content of the data and artefacts   of the processing resulted in the uppermost 150 ms being poorly   resolved. This depth range contains caprock, shallow faults and an aquifer system. Thus, characterizing the shallow subsurface is important in terms of site delineation of potential leakage paths and monitoring after CO2 injection. In order to study the potential of   mapping the uppermost reflectors and shallow structures associated with  major fault zones, a comprehensive reprocessing effort on a subset of the 3D data was performed. The challenge in imaging shallow reflections is dependent upon the separation of ground roll and refracted energy   from the reflected energy, as well as compensation for time shifts due   to statics. Among the processing sequences, refraction static corrections, careful muting and filtering, velocity analysis and 3D   time migration were key steps for enhancing the resolution and   coherency of shallow seismic reflections. This study images a  previously unmapped horizon, close to the Quaternary-Tertiary boundary, at about 95-120 ms (similar to 65-90 m depth). Correlation of lateral variations in reflectivity along this boundary, lateral velocity   variations in the tomographic image and the seismic signature in   modelling studies suggest an aquifer/aquitard complex and variable   lithology with associated localized silty or clayey sediments,   overlying the Tertiary Rupelton clay unit. In the previous processing   it was not clear if the deeper faults imaged on the 3D seismic survey   extended to shallower levels than the base Tertiary. Thus, a   comprehensive fault detection technique, multi-attributes and neural networks analysis, was employed in this study to allow a more reliable  fault geometry to be interpreted. Tracking of faults in the seismic   image and comparisons with a tomography study indicate that some deeper faults may penetrate into the overlying Tertiary unit. These findings are important for understanding potentially risky areas and can be used as a database for future monitoring programmes at the site.

  • 246631.
    Yordkayhun, Sawasdee
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
    Tryggvason, Ari
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
    Norden, Ben
    Juhlin, Christopher
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
    Bergman, Björn
    3D seismic traveltime tomography imaging of the shallow subsurface at the CO2SINK project site, Ketzin, Germany2009In: Geophysics, ISSN 0016-8033, E-ISSN 1942-2156, Vol. 74, no 1, p. G1-G15Article in journal (Refereed)
    Abstract [en]

    A 3D reflection seismic survey was performed in 2005 at the Ketzin carbon dioxide (CO2) pilot geological-storage site (the CO2SINK project) near Berlin, Germany, to image the geological structure of the site to depths of about 1 km. Because of the acquisition geometry, frequency limitations of the source, and artefacts of the data processing, detailed structures shallower than about 150 m were unclear. To obtain structural images of the shallow subsurface, we applied 3D traveltime tomography to data near the top of the Ketzin anticline, where faulting is present. Understanding the shallow subsurface structure is important for long-term monitoring aspects of the project after CO2 has been injected into a saline aquifer at about 650-m depth. We used a 3D traveltime tomography algorithm based on a combination of solving for 3D velocity structure and static corrections in the inversion process to account for artefacts in the velocity structure because of smearing effects from the unconsolidated cover. The resulting velocity model shows low velocities of 800 1200 m/s in the uppermost shallow subsurface of the study area. The velocity reaches about 1800 m/s at a depth of 60-80 m. This coincides approximately with the boundary between Quaternary units, which contain the near-surface freshwater reservoir and the Tertiary clay aquitard. Correlation of tomographic images with a similarity attribute slice at 150 ms (about 150-m depth) indicates that at least one east-west striking fault zone observed in the reflection data might extend into the Tertiary unit. The more detailed images of the shallow subsurface from this study provided valuable information on this potentially risky area.

  • 246632.
    Yoshihara, Akifumi
    et al.
    Univ Tokyo, Dept Bioengn, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan..
    Sekine, Ryota
    Univ Tokyo, Dept Bioengn, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan..
    Ueki, Takayuki
    Univ Tokyo, Dept Bioengn, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan..
    Kondo, Yasuhito
    Gunma Prefectural Text Ind Lab, 5-46-1 Aioicho, Kiryu, Gumma 3760011, Japan..
    Sunaga, Yoshiyuki
    Yanase Sangyosya, Midori Ku, 2703-1 Kasakakechosika, Gunma 3792313, Japan..
    Nakaji-Hirabayashi, Tadashi
    Univ Toyama, Grad Sch Sci & Engn, Dept Appl Chem, Toyama 9308555, Japan.;Univ Toyama, Frontier Res Core Life Sci, Toyama 9308555, Japan..
    Teramura, Yuji
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology. Univ Tokyo, Dept Bioengn, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan. .
    Takai, Madoka
    Univ Tokyo, Dept Bioengn, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan..
    Rapid and highly efficient capture and release of cancer cells using polymeric microfibers immobilized with enzyme-cleavable peptides2018In: Acta Biomaterialia, ISSN 1742-7061, E-ISSN 1878-7568, Vol. 67, p. 32-41Article in journal (Refereed)
    Abstract [en]

    Circulating tumor cells (CTCs) are tumor cells present in the blood. CTCs have attracted much attention as a new tumor marker, because their analysis provides useful information for monitoring cancer progress. In this study, we developed cell-capture and release methods using three-dimensional (3D) microfiber fabrics without damaging the cells. Using functional peptides containing sequences from a polystyrene-binding site and a cleavable site for collagenase type IV, immobilized antibodies on the peptides were able to specifically capture MCF-7 cells in a few minutes and release the captured cells from 3D microfiber fabrics incorporating a vacuum system. The efficiency of cell capture was around 80% and that of the cell release was over 90%. The released cells proliferated normally in culture medium, suggesting that our system will be applicable for the culture and analysis of CTCs. Statement of Significance In this paper, we report cell-capture and release methods using enzyme-cleavable peptides immobilized on microfiber fabrics which has microporous polymeric three-dimensional structures. Detachment and collection of the selectively captured cancer cells are required for ex vivo culture and their further analysis, whereas the cell detachment methods developed so far might cause cell damage, even if cell viability is high enough. Therefore, specific attachment and gentle detachment from the device are required for the accurate analysis of cells. In this study, for capture and release of cancer cells we designed the peptide cleavable by collagenase type IV, which has no target molecule in cells. Our system will be useful for further CTC analysis and might lead to more accurate cancer diagnosis.

  • 246633. Yoshimi, A.
    et al.
    Mohamed, M.
    Bierings, M.
    Urban, C.
    Korthof, E.
    Zecca, M.
    Sykora, K-W.
    Duffner, U.
    Trebo, M.
    Matthes-Martin, S.
    Sedlacek, P.
    Klingebiel, T.
    Lang, P.
    Führer, M.
    Claviez, A.
    Wössmann, W.
    Pession, A.
    Arvidson, Johan
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Women's and Children's Health.
    O'Marcaigh, A. S.
    van den Heuvel-Eibrink, M. M.
    Starý, J.
    Hasle, H.
    Nöllke, P.
    Locatelli, F.
    Niemeyer, Charlotte M.
    Second allogeneic hematopoietic stem cell transplantation (HSCT) results in outcome similar to that of first HSCT for patients with juvenile myelomonocytic leukemia2007In: Leukemia, ISSN 0887-6924, E-ISSN 1476-5551, Vol. 21, no 3, p. 556-560Article in journal (Refereed)
  • 246634. Yoshizaki, Lucila
    et al.
    Troncoso, María F.
    Lopes, Jose L. S.
    Hellman, Ulf
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Medicinska och farmaceutiska vetenskapsområdet, centrumbildningar mm , Ludwig Institute for Cancer Research.
    Beltramini, Leila M.
    Wolfenstein-Todel, Carlota
    Calliandra selloi Macbride trypsin inhibitor: isolation, characterization, stability, spectroscopic analyses2007In: Phytochemistry, ISSN 0031-9422, E-ISSN 1873-3700, Vol. 68, no 21, p. 2625-2634Article in journal (Refereed)
    Abstract [en]

    A trypsin inhibitor was purified from Calliandra selloi Macbride seeds (CSTI). SDS-PAGE under non-reducing conditions showed a single band of approximately 20,000Da, while under reducing conditions two bands of 16,000 and 6000Da were observed, indicating that CSTI consists of two polypeptide chains. Molecular masses of 20,078 and 20,279 were obtained by mass spectrometry, although only one pI of 4.0 was observed and one peak was obtained by reversed phase chromatography. Amino-terminal sequence analysis showed homology to Kunitz-type inhibitors. CSTI was able to inhibit trypsin (K(i) 2.21x10(-7)M), alpha-chymotrypsin (K(i) 4.95x10(-7)M) and kallikrein (K(i) 4.20x10(-7)M) but had no effect on elastase. Trypsin inhibitory activity was stable over a wide range of pH and temperature. CSTI was particularly susceptible to DTT treatment, followed by addition of iodoacetamide. Far-UV circular dichroism measurements revealed that CSTI is a beta-II protein. Thermal unfolding showed a two-state transition with a midpoint at 68 degrees C. Far-UV CD spectra of CSTI at pH extremes showed little changes, while more pronounced differences in near-UV CD spectra were detected. Remarkably, treatment with 1mM DTT caused very slight changes in the far-UV CD spectrum, and only after carbamidomethylation was there was a marked loss observed in secondary structure.

  • 246635. Yotapan, Nattawut
    et al.
    Paptchikhine, Alexander
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC.
    Bera, Milan
    Avula, Satya Kumar
    Vilaivan, Tirayut
    Andersson, Pher G.
    Simple Proline-Derived Phosphine-Thiazole Iridium Complexes for Asymmetric Hydrogenation of Trisubstituted Olefins2013In: Asian Journal of Organic Chemistry, ISSN 2193-5807, Vol. 2, no 8, p. 674-680Article in journal (Refereed)
    Abstract [en]

    Proline-based phosphine-thiazole/imidazole ligands have been synthesized and successfully applied in the homogeneous, iridium-catalyzed, asymmetric hydrogenation of trisubstituted functionalized and unfunctionalized olefins. Five different sets of ligands were prepared then evaluated for their catalytic activity and enantioselectivity in asymmetric hydrogenation.

  • 246636.
    Yotsumoto, Masato
    et al.
    Kanto Gakuin University.
    Lennerfors, Thomas Taro
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Industrial Engineering & Management.
    Majima, Takashi
    Senshu University.
    The current trends and issues of Green IT2011Conference paper (Refereed)
    Abstract [en]

    Today, in a situation where global requirements of sustainability are high, and where sustainability and energy use has received renewed interest because of the Great East Japan Earthquake, we address one of the sustainability efforts that Japanese companies are making - namely Green IT. Basically, Green IT means both to reduce environmental impact by using IT, and to reduce the environmental impact of IT as such. In the U.S. and Europe, Green IT is gaining speed, but might it be the case that Japan is lagging behind? In this presentation, we present the current state of Green IT in Japan and situate it in a global context. We also discuss its importance for the future.

  • 246637.
    You, Chang Chuan
    et al.
    Inst Energy Technol, Dept Solar Energy, NO-2027 Kjeller, Norway..
    Moldarev, Dmitrii
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. Moscow Engn Phys Inst, Dept Mat Sci, Moscow 115409, Russia..
    Mongstad, Trygve
    Inst Energy Technol, Dept Solar Energy, NO-2027 Kjeller, Norway..
    Primetzhofer, Daniel
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Wolff, Max
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
    Stensrud Marstein, Erik
    Inst Energy Technol, Dept Solar Energy, NO-2027 Kjeller, Norway..
    Karazhanov, Smagul Zh.
    Inst Energy Technol, Dept Solar Energy, NO-2027 Kjeller, Norway..
    Enhanced photochromic response in oxygen-containing yttrium hydride thin films transformed by an oxidation process2017In: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 166, p. 185-189Article in journal (Refereed)
    Abstract [en]

    Photochromic oxygen-containing yttrium hydride (YHO) thin films with switchable optical properties have recently emerged as a promising material for the utilization in smart windows and sensor applications. In the present study, we have prepared YHO thin films with a lateral gradient of oxygen and hydrogen concentrations, which allows us to systematically investigate the effect of changes in chemical composition on their optical properties. We show that when the average lateral oxygen content exceeded a threshold level at a certain location in the as-deposited film, its appearance was abruptly changed from black opaque to yellow transparent, in which only yellow YHO exhibited photochromism. Moreover, we show that a small region (typically 510 mm lateral size) in the black opaque part of the as-deposited film, located adjacent to the yellow transparent part of the film, was observed to transform permanently to yellow transparent upon exposure to oxygen in air in the dark for several weeks. The black to yellow color transformation was caused by an increase in the oxygen concentration, originating from the oxidation process. Optical characterization revealed pronounced photo chromic response in the transformed region as compared to the rest of the yellow film. This finding demonstrates that the switchable optical properties can be tailored by changing the chemical composition of YHO films.

  • 246638. You, L.
    et al.
    Yuan, D.
    Load Optimization With User Association in Cooperative and Load-Coupled LTE Networks2017In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 16, no 5, p. 3218-3231Article in journal (Refereed)
  • 246639.
    You, Lei
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Computing Science. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computing Science.
    Network Optimization of Evolving Mobile Systems with Presence of Interference Coupling2019Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The rapid development from 4G to 5G of mobile communications poses significant challenges in providing high rate and capacity, making it more crucial for efficient utilization of time-frequency resource via optimally configuring the network. Mathematical optimization serves as a powerful tool for addressing this type of problems. However, gauging its potential in large-scale cellular networks is non-trivial due to the inherent coupling relation of interference among cells. To address this issue, the dissertation adopts a so-called load-coupling system that mathe-matically formulates the mutual influence caused by radio resource allocation among cells. The model defines the time-frequency resource consumption in each cell as the cell load. The load of one cell governs the interference that the cell generates to the others, since the cell trans-mits more frequently with higher load. The model enables joint optimization of resource al-location in multiple cells with respect to the dynamics of resource occupancy of cells. Under the load coupling model, the dissertation applies mathematical optimization to resolve resource management problems with respect to a number of evolving technologies, such as coordinated multipoint (CoMP) transmission, wireless relays, cloud radio access networks (C-RAN), and non-orthogonal multiple access (NOMA). Six research papers are included in the dissertation. Paper I addresses the question of how network planning and coordination may increase the ef-ficiency of spectrum usage, by jointly optimizing user association and resource allocation with CoMP. Paper II investigates the potential of relay cooperation for energy saving. As an extension of Paper I, Paper III studies the capacity maximization for a target group of users, while keep-ing the quality-of-service (QoS) of other users being strictly met. Paper IV provides a general framework and a series of theoretical analysis for algorithmically enabling resource optimization in multi-cell NOMA with load coupling, where users are allowed to group together for sharing time-frequency resource by successive interference cancellation (SIC). Under this framework, Paper V explores the potential of NOMA networks. For a restricted setup of NOMA, the paper achieves globally optimal resource usage efficiency, in terms of power allocation, user pair se-lection, and time-frequency resource allocation. Finally, Paper VI, serving as a complementary note, overcomes a key obstacle in analyzing convergence of applying load coupling in NOMA networks.

    List of papers
    1. Load Optimization With User Association in Cooperative and Load-Coupled LTE Networks
    Open this publication in new window or tab >>Load Optimization With User Association in Cooperative and Load-Coupled LTE Networks
    2017 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 16, no 5, p. 3218-3231Article in journal (Refereed) Published
    Keywords
    cooperative communication;integer programming;interference;linear programming;Long Term Evolution;load optimization;user association;cooperative load-coupled LTE networks;cellular networks;inter-cell interference;optimization problems;sum load minimization;maximum load minimization;MinSumL;MinMaxL;mixed integer linear programming based scheme;partial optimality conditions;Interference;Couplings;Load modeling;Resource management;Mathematical model;Optimization;Minimization;Joint transmission;load balancing;load-coupling;heterogeneous networks;resource efficiency
    National Category
    Telecommunications
    Identifiers
    urn:nbn:se:uu:diva-391126 (URN)10.1109/TWC.2017.2676762 (DOI)
    Available from: 2019-08-19 Created: 2019-08-19 Last updated: 2019-08-19
    2. Energy-Aware Wireless Relay Selection in Load-Coupled OFDMA Cellular Networks
    Open this publication in new window or tab >>Energy-Aware Wireless Relay Selection in Load-Coupled OFDMA Cellular Networks
    2017 (English)In: IEEE Communications Letters, ISSN 1089-7798, E-ISSN 1558-2558, Vol. 21, no 1, p. 144-147Article in journal (Refereed) Published
    Abstract [en]

    We investigate transmission energy minimization via optimizing wireless relay selection in orthogonal-frequency-division multiple access networks. We take into account the impact of the load of cells on transmission energy. We prove the NP-hardness of the energy-aware wireless relay selection problem. To tackle computational complexity, a partial optimality condition is derived for providing insights in respect of designing an effective and efficient algorithm. Numerical results show the resulting algorithm achieves high energy performance.

    Place, publisher, year, edition, pages
    Institute of Electrical and Electronics Engineers (IEEE), 2017
    Keywords
    Heterogeneous network, wireless relay, OFDMA, energy efficiency
    National Category
    Telecommunications
    Identifiers
    urn:nbn:se:uu:diva-319321 (URN)10.1109/LCOMM.2016.2615604 (DOI)000393788000036 ()
    Available from: 2017-04-10 Created: 2017-04-10 Last updated: 2019-08-19Bibliographically approved
    3. User-centric Performance Optimization with Remote Radio Head Cooperation in C-RAN
    Open this publication in new window or tab >>User-centric Performance Optimization with Remote Radio Head Cooperation in C-RAN
    2017 (English)Manuscript (preprint) (Other academic)
    National Category
    Telecommunications
    Identifiers
    urn:nbn:se:uu:diva-391127 (URN)
    Available from: 2019-08-19 Created: 2019-08-19 Last updated: 2019-08-30
    4. A Framework for Optimizing Multi-cell NOMA: Delivering Demand with Less Resource
    Open this publication in new window or tab >>A Framework for Optimizing Multi-cell NOMA: Delivering Demand with Less Resource
    Show others...
    2017 (English)In: GLOBECOM 2017 - 2017 IEEE Global Communications Conference, IEEE , 2017Conference paper, Published paper (Refereed)
    Abstract [en]

    Non-orthogonal multiple access (NOMA) allows multiple users to simultaneously access the same time-frequency resource by using superposition coding and successive interference cancellation (SIC). Thus far, most papers on NOMA have focused on performance gain for one or sometimes two base stations. In this paper, we study multi-cell NOMA and provide a general framework for user clustering and power allocation, taking into account inter-cell interference, for optimizing resource allocation of NOMA in multi-cell networks of arbitrary topology. We provide a series of theoretical analysis, to algorithmically enable optimization approaches. The resulting algorithmic notion is very general. Namely, we prove that for any performance metric that monotonically increases in the cells' resource consumption, we have convergence guarantee for global optimum. We apply the framework with its algorithmic concept to a multi-cell scenario to demonstrate the gain of NOMA in achieving significantly higher efficiency.

    Place, publisher, year, edition, pages
    IEEE, 2017
    Series
    IEEE Global Communications Conference, ISSN 2334-0983
    National Category
    Computer Sciences
    Identifiers
    urn:nbn:se:uu:diva-357087 (URN)10.1109/GLOCOM.2017.8254922 (DOI)000428054305033 ()978-1-5090-5019-2 (ISBN)
    Conference
    IEEE Global Communications Conference (GLOBECOM), DEC 04-08, 2017, YourSingapore, Singapore, SINGAPORE
    Available from: 2018-08-10 Created: 2018-08-10 Last updated: 2019-08-19Bibliographically approved
    5. Resource optimization with load coupling in multi-cell NOMA
    Open this publication in new window or tab >>Resource optimization with load coupling in multi-cell NOMA
    Show others...
    2018 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 17, no 7, p. 4735-4749Article in journal (Refereed) Published
    National Category
    Communication Systems
    Identifiers
    urn:nbn:se:uu:diva-361538 (URN)10.1109/TWC.2018.2830386 (DOI)000438727700036 ()
    Available from: 2018-05-03 Created: 2018-10-01 Last updated: 2019-08-19Bibliographically approved
    6. A Note on Decoding Order in Optimizing Multi-cell NOMA
    Open this publication in new window or tab >>A Note on Decoding Order in Optimizing Multi-cell NOMA
    (English)Manuscript (preprint) (Other academic)
    National Category
    Telecommunications
    Identifiers
    urn:nbn:se:uu:diva-391128 (URN)
    Available from: 2019-08-19 Created: 2019-08-19 Last updated: 2019-08-30
  • 246640.
    You, Lei
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Ding, Lianghui
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Wu, Ping
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Pan, Zhiwen
    National Mobile Communication Research Laboratory, Southeast University, Nanjing, China.
    Hu, Honglin
    Shanghai Research Center for Wireless Communcations, Shanghai, China.
    Song, Mei
    PCN CAD Center, Beijing University of Posts and Telecommunications, Beijing, China.
    Song, Junde
    PCN CAD Center, Beijing University of Posts and Telecommunications, Beijing, China.
    Cross-layer optimization of wireless multihop networks with one-hop two-way network coding2011In: Computer Networks, ISSN 1389-1286, E-ISSN 1872-7069, Vol. 55, no 8, p. 1747-1769Article in journal (Refereed)
    Abstract [en]

    In this paper, we investigate optimal cross-layer design of congestion control, routing, one-hop two-way inter-commodity (OTIC) network coding and scheduling in wireless multihop networks utilizing the broadcast advantage of wireless medium. We first present an achievable rate region with OTIC network coding by introducing virtual flow rates in a node. Then we formulate the network utility maximization problem subject to constraints on this achievable rate region, and analyze the complexities of both node- and path-based formulation with no network coding, OTIC network coding, and overhearing network coding. After that, we solve it using dual decomposition and subgradient method. Based on the solution, we present a new queue model, which is able to facilitate the coding operation between two-way commodities, and then propose a backpressure-based cross-layer optimization algorithm with low coding complexity and overhead. Afterwards, we analyze the stability and asymptotical optimality of the proposed cross-layer algorithm by Lyapunov drift technique, and evaluate its performance through extensive simulation. By comparing with the pure routing scheme under both primary and two-hop interference models in an illustrative topology, it is shown that with the proposed joint optimization algorithms, the OTIC network coding can interact adaptively and optimally with other components in different layers and achieve high throughput gain. Simulation of the proposed algorithm in a mesh network with base station and a random ad hoc network justifies that OTIC network coding can obtain considerable throughput gain with low complexity in various kinds of networks.

  • 246641.
    You, Lei
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computing Science.
    Lei, Lei
    Luxembourg Univ, Interdisciplinary Ctr Secur Reliabil & Trust, Luxembourg, Luxembourg..
    Yuan, Di
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computing Science.
    Sun, Sumei
    Inst Infocomm Res, A STAR, Singapore, Singapore..
    Chatzinotas, Symeon
    Luxembourg Univ, Interdisciplinary Ctr Secur Reliabil & Trust, Luxembourg, Luxembourg..
    Ottersten, Bjoern
    Luxembourg Univ, Interdisciplinary Ctr Secur Reliabil & Trust, Luxembourg, Luxembourg..
    A Framework for Optimizing Multi-cell NOMA: Delivering Demand with Less Resource2017In: GLOBECOM 2017 - 2017 IEEE Global Communications Conference, IEEE , 2017Conference paper (Refereed)
    Abstract [en]

    Non-orthogonal multiple access (NOMA) allows multiple users to simultaneously access the same time-frequency resource by using superposition coding and successive interference cancellation (SIC). Thus far, most papers on NOMA have focused on performance gain for one or sometimes two base stations. In this paper, we study multi-cell NOMA and provide a general framework for user clustering and power allocation, taking into account inter-cell interference, for optimizing resource allocation of NOMA in multi-cell networks of arbitrary topology. We provide a series of theoretical analysis, to algorithmically enable optimization approaches. The resulting algorithmic notion is very general. Namely, we prove that for any performance metric that monotonically increases in the cells' resource consumption, we have convergence guarantee for global optimum. We apply the framework with its algorithmic concept to a multi-cell scenario to demonstrate the gain of NOMA in achieving significantly higher efficiency.

  • 246642.
    You, Lei
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computing Science.
    Liao, Qi
    Nokia Bell Labs, D-70435 Stuttgart, Germany.
    Pappas, Nikolaos
    Linkoping Univ, Dept Sci & Technol, S-60174 Norrkoping, Sweden.
    Yuan, Di
    Linkoping Univ, Dept Sci & Technol, S-60174 Norrkoping, Sweden.
    Resource Optimization With Flexible Numerology and Frame Structure for Heterogeneous Services2018In: IEEE Communications Letters, ISSN 1089-7798, E-ISSN 1558-2558, Vol. 22, no 12, p. 2579-2582Article in journal (Refereed)
    Abstract [en]

    We explore the potential of optimizing resource allocation with flexible numerology in frequency domain and variable frame structure in time domain, with services of with different types of requirements. We prove the NP-hardness of the problem and propose a scalable optimization algorithm based on linear programming and Lagrangian duality. Numerical results show significant advantages of adopting flexibility in both time and frequency domains for capacity enhancement and meeting the requirements of mission critical services.

  • 246643.
    You, Lei
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Wu, Ping
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Pan, Zhiwen
    National Mobile Communication Research Laboratory, Southeast University, Nanjing, Jiangsu, PR China.
    Hu, Honglin
    Shanghai Research Center for Wireless Communications, Shanghai, PR China.
    Song, Junde
    PCN&CAD Center, Beijing University of Posts and Telecommunications, Beijing, PR China.
    Song, Mei
    PCN&CAD Center, Beijing University of Posts and Telecommunications, Beijing, PR China.
    Cross-layer optimization of wireless multi-hop networks with network coding2009In: 2009 International Conference on Wireless Communications and Signal Processing (WCSP), Nanjing, Kina, 2009Conference paper (Refereed)
  • 246644.
    You, Lei
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Wu, Ping
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Song, Mei
    PCN CAD Center, Beijing University of Posts and Telecommunications, Beijing, China.
    Song, Junde
    PCN CAD Center, Beijing University of Posts and Telecommunications, Beijing, China.
    Zhang, Yong
    Cross-layer optimisation for uplink transmission in OFDMA cellular networks with fixed relays2011In: European transactions on telecommunications, ISSN 1124-318X, E-ISSN 2161-3915, Vol. 22, no 6, p. 296-314Article in journal (Refereed)
    Abstract [en]

    In this paper, we consider a cross-layer design aimed to enhance performance for uplink transmission in an orthogonal frequency division multiple-access (OFDMA)-based cellular network with fixed relay stations. Because mobile stations (MSs) spend most of the power on the uplink transmission, power efficiency resource allocation becomes very important to MSs. We develop a cross-layer optimisation framework for two types of uplink flows (inelastic and elastic flows) that have different quality-of-service requirements. For inelastic flows with fixed-rate requirement, we formulate the cross-layer optimisation problem as the minimisation of the sum transmission power of MSs under the constraints of flow conservation law, subcarrier assignment, relaying path selection and power allocation. For elastic flows with flexible-service-rate requirement, we consider the cross-layer trade-off between uplink service rate and power consumption of MSs and pose the optimisation problem as the maximisation of a linear combination of utility (of service rates) and power consumption (of MSs). Different trade-offs can be achieved by varying the weighting parameters. Dual decomposition and subgradient methods are used to solve the problems optimally with reduced computational complexity. The simulation results show that, through the proposed cross-layer resource optimisation framework and algorithms, significant benefits of deployment of multiple fixed relays in an OFDMA cellular network can be fully obtained such as reduction in power consumption, increase in service rate and energy savings in the uplink transmission of MSs.

  • 246645.
    You, Lei
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Wu, Ping
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Song, Mei
    Song, Junde
    Zhang, Yong
    Dynamic Control and Resource Allocation in Wireless-Infrastructured Distributed Cellular Networks with OFDMA2009In: 2009 INTERNATIONAL CONFERENCE ON PARALLEL PROCESSING WORKSHOPS (ICPPW 2009) / [ed] Barolli L, Feng WC, 2009, p. 337-343Conference paper (Refereed)
    Abstract [en]

    In this paper, we consider joint optimization of end-to-end data transmission and resource allocation for Wireless-Infrastructured Distributed Cellular Networks (WIDCNs), where each base station (BS) in a cell is connected with its neighboring BSs via wireless links, and a mobile station (MS) can access one or multiple adjacent BSs simultaneously through time-varying OFDMA channels. The communications between a source MS and a destination MS are carried out with the help of BSs in the multi-hop, distributed manner. To achieve the joint optimization for such WIDCNs, a Stochastic Network Utility Maximization (SNUM) problem is formulated under the constraints of OFDMA sub-channel allocation on time-varying access links (both uplink and downlink), as well as routing and scheduling on forwarding links among BSs. By decomposing the corresponding dual problem, transforming it into a stochastic convex optimization problem and solving it by quasi-gradient method, we obtain distributed dynamic control algorithms for end-to-end data transmission. The algorithm can adapt to the OFMDA channel variation and converges asymptotically to the optimal solution. We also develop a distributed algorithm for OFDMA sub-channel allocation and link coordination between BSs. The simulation results show that the data rates of the flows can converge to optimal solution approximately, queues of the network is stable under the proposed distributed dynamic algorithm, and the multi-receiver scheme outperforms the single-receiver scheme due to diversity.

  • 246646.
    You, Lei
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Wu, Ping
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Song, Mei
    PCN&CAD Center, Beijing University of Posts and Telecommunications, Beijing, PR China.
    Song, Junde
    PCN&CAD Center, Beijing University of Posts and Telecommunications, Beijing, PR China.
    Zhang, Yong
    PCN&CAD Center, Beijing University of Posts and Telecommunications, Beijing, PR China.
    Dynamic control and resource allocation in wireless-infrastructured distributed cellular networks with OFDMA2009In: 2nd International Workshop on Next Generation of Wireless and Mobile Networks (NGWMN), Vienna, Österrike, 2009Conference paper (Refereed)
  • 246647.
    You, Lei
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computing Science.
    Yuan, Di
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computing Science.
    A Note on Decoding Order in Optimizing Multi-cell NOMAManuscript (preprint) (Other academic)
  • 246648.
    You, Lei
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computing Science.
    Yuan, Di
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computing Science.
    Joint CoMP-Cell Selection and Resource Allocation in Fronthaul-Constrained C-RAN2017In: Proc. 15th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks, IEEE, 2017Conference paper (Refereed)
  • 246649.
    You, Lei
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computing Science.
    Yuan, Di
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computing Science.
    User-centric Performance Optimization with Remote Radio Head Cooperation in C-RAN2017Manuscript (preprint) (Other academic)
  • 246650.
    You, Lei
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computing Science.
    Yuan, Di
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computing Science.
    Lei, Lei
    Sun, Sumei
    Chatzinotas, Symeon
    Ottersten, Björn
    Resource optimization with load coupling in multi-cell NOMA2018In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 17, no 7, p. 4735-4749Article in journal (Refereed)
4930493149324933493449354936 246601 - 246650 of 253558
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