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  • 238901.
    Yazdani, Arya
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.
    Tano, Erik
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.
    Stefan, Bengtlars
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.
    Inkubatorns roll: En studie om Uppsala Innovation Centre och dess samarbete med nystartade företag2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med denna uppsats är att undersöka hur inkubatorn Uppsala Innovation Centre (UIC) arbetar med nystartade företag. För att uppnå detta har företagens etableringsprocesser och de hinder de stöter på under denna process studerats, för att sedan analysera hur UIC arbetar för att överbrygga dessa hinder. Uppsatsen bygger på kvalitativa intervjuer och en enkätundersökning med företag som samarbetat med UIC, samt en kvalitativ intervju med UIC:s VD Per Bengtsson. Slutsatsen är att UIC är en välfungerande och uppskattad inkubator, deras största förtjänst är att de med sitt affärscoachprogram lyckats hålla en hög flexibilitet som ger dem möjlighet att anpassa sig efter de olika företagens behov.

  • 238902.
    Yazdani Najafabadi, HamidReza
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology.
    Contract Programming Checker: A Study for Making an Automated Test Tool Using a Parser2009Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Thanks to computer software development, the communication industry hasevolved a lot during the last few years. Software and hardware integration made itpossible to exploit the best out of available equipments.

    One of the important issues in software development process is to avoid bugs ordetect them in the early stage of development phase. Experiments have shown thatmost of the bugs are usually coming from the small fraction of the code. If this part ofthe code can be detected in advance then it is possible to benefit the cost of softwareproduction in great amount of time and money. Development teams have to makesure that they deliver a verified code to next team and that is why they obliged to usea concept called “contract programming”. It means expecting each module which isworking with other modules to respect to some kind of contract. As long as thecontract is respected in all module interactions, valid output will be guaranteed.

    Several problems will remain in this approach. First issue is to make sure allnecessary contracts have been embedded to the code. On the other hand, contractsare memory and time consuming to check so try doing over protection results inweaker performance.

    Considering the scalability problem, there is an urgent need for an automatic toolwhich is capable of checking against all possible defects to tell the programmer exactlywhere the contract is needed without performing any under or over protection.

    This thesis tries to address this problem by generating a parser using UNIX tools,Lex (lexical analyzer) and Yacc (parser generator), to detect or worn about thepossible cause of defects. General built-in functions with different algorithms have alsobeen implemented in C language to perform different level of code analysis. Theoutcome of this thesis is a parser which fulfills three different requirements.

    Firstly, checking all protected required places to check if they have been protectedby their proper contracts.

    Secondly, notifying the extra contracts in places where they are not needed. It isdone by parser which analyzes the calling graph of different functions to verify if thecontracts are actually needed.

    The last but not least requirement is to find the least protection required areas. Itmeans places where protection should be kept even if all internal computations areguaranteed to be correct. This facility will be used when the code wants to bedelivered to other teams and the internal integration of the code is already verified.

    The tool is also capable of performing statistical analysis to give an exact percentageof protection in each function block and the software unit as a whole.

    The Developed tool has successfully passed all of the exhaustive tests for furnishingthese requirements.

  • 238903.
    Yazdani, Negar
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.
    Andersson, Helena
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.
    Statlig förvärvsgaranti: Kommer fler unga vuxna att kunna köpa sin egen bostad?2008Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Det är svårt att etablera sig på bostadsmarknaden som ung vuxen eller ny i landet beroende bland annat på att dessa ofta saknar kontakter eller eget kapital att skjuta till vid ett köp. För att lösa en del av detta problem införs från och med den 1 mars 2008 en förvärvsgaranti, som är tänkt att underlätta för de som vill köpa sin bostad. Den innebär att förstagångsköpare kan bli hjälpta med en statlig garanti gällande 100 000kr i räntebetalningar över 10 år, när de söker ett bostadslån. Syftet med denna uppsats är att utreda kreditgivarnas syn på införandet av en sådan. Vidare är syftet även att jämföra denna modell med två alternativa och välfungerande utländska modeller. För att kunna uppnå detta syfte har vi valt att göra en kvalitativ utredning bland de fyra största bolåneinstituten i Sverige. Dessa är Handelsbanken, Swedbank, SEB och Nordea. Genom denna utredning har vi kommit fram till att en förvärvsgaranti inte kommer att påverka kreditgivningen i sådan grad att de som tidigare inte kunnat få ett lån nu kommer att få det. Dock kan ett fåtal gränsfall eventuellt bli hjälpta av den.

  • 238904.
    Yazdi, Homa P.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics.
    Bolivar, Paulina
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics.
    Mugal, Carina F.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics.
    Ellegren, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics.
    Variation in the Z Chromosome to Autosomes Ratio of Genetic Diversity across Birds and its Relationship to the Fast-Z effectManuscript (preprint) (Other academic)
  • 238905.
    Yazdi, Homa P.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics.
    Kawakami, Takeshi
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics.
    Unneberg, Per
    Schou, Mads F.
    Cloete, Schalk W. P.
    Cornwallis, Charlie K.
    Patterns of Nucleotide Diversity and Linkage Disequilibrium along the Ostrich Pseudoautosomal RegionManuscript (preprint) (Other academic)
  • 238906.
    Yazdi, Homa Papoli
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics.
    The evolution of sex chromosomes and sex-linked sequences in birds2019Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Identifying the processes involved in the evolution of suppressed recombination between sex chromosomes and understanding their consequences for the evolutionary dynamics of sex-linked loci have been major topics of research during the last century. In this thesis, I used the avian ZW system, where females are the heterogametic sex, to investigate the underlying processes in sex chromosome evolution in birds. I identified the gametologous genes between the largely recombining Z and W chromosomes of ostrich and dated the timing of the cessation of recombination to prior to the split of modern birds. I then constructed a genetic map of the ostrich Z chromosome and corrected its assembly in order to obtain the ancestral organization of the Z chromosome in a basal clade of birds. By analyzing the inversion events across the avian phylogeny, I concluded that a combination of Z- and possibly W-linked inversions might have been responsible for the evolution of suppressed recombination in avian sex chromosomes. To understand the determinants of levels of genetic diversity on Z chromosome compared to autosomes, I calculated Z to autosome (Z:A) genetic diversity across 32 avian species. This revealed a broad range of Z:A genetic diversity, between 0.278 – 1.27. Lineage-specific estimates of the nonsynonymous to synonymous substitution rate ratio (dN:dS) for autosomal and Z-linked genes further revealed a Fast-Z effect in the majority of birds. The lack of a significant correlation between Z:A dN:dS and Z:A genetic diversity indicated that genetic drift might not be sufficient to explain faster evolution of Z-linked genes, suggesting that positive selection might also contribute to the observed values. Finally, I calculated genetic diversity and linkage disequilibrium (LD) along the pseudoautosomal region (PAR) of the Z chromosome using population genomics data of ostrich. In contrast to theoretical expectation, levels of diversity on the PAR were not significantly higher close to the sex-determining region (SDR) compared to autosomal values. Additionally, I observed a lower level of LD on the PAR compared to the average for the Z chromosome and no significant level of LD across the PAR boundary was detected, indicating recombination allows the boundary-proximal region of PAR to behave independently of SDR. Considered together with a higher level of recombination rate in females in the proximity of the SDR, this observation might help explain the maintenance of a long PAR in ostriches and other ratites. Altogether, the results of this thesis make a modest contribution to our understanding of sex chromosome evolution in birds.

    List of papers
    1. Old but Not (So) Degenerated-Slow Evolution of Largely Homomorphic Sex Chromosomes in Ratites
    Open this publication in new window or tab >>Old but Not (So) Degenerated-Slow Evolution of Largely Homomorphic Sex Chromosomes in Ratites
    2014 (English)In: Molecular biology and evolution, ISSN 0737-4038, E-ISSN 1537-1719, Vol. 31, no 6, p. 1444-1453Article in journal (Refereed) Published
    Abstract [en]

    Degeneration of the nonrecombining chromosome is a common feature of sex chromosome evolution, readily evident by the presence of a pair of largely heteromorphic chromosomes, like in eutherian mammals and birds. However, in ratites (order Palaeognathae, including, e.g., ostrich), the Z and W chromosomes are similar in size and largely undifferentiated, despite avian sex chromosome evolution was initiated > 130 Ma. To better understand what may limit sex chromosome evolution, we performed ostrich transcriptome sequencing and studied genes from the nonrecombining region of the W chromosome. Fourteen gametologous gene pairs present on the W chromosome and Z chromosome were identified, with synonymous sequence divergence of 0.027-0.177. The location of these genes on the Z chromosome was consistent with a sequential increase in divergence, starting 110-157 and ending 24-30 Ma. On the basis of the occurrence of Z-linked genes hemizygous in females, we estimate that about one-third of the Z chromosome does not recombine with the W chromosome in female meiosis. Pairwise d(N)/d(S) between gametologs decreased with age, suggesting strong evolutionary constraint in old gametologs. Lineage-specific d(N)/d(S) was consistently higher in W-linked genes, in accordance with the lower efficacy of selection expected in nonrecombining chromosomes. A higher ratio of GC > AT:AT > GC substitutions in W-linked genes supports a role for GC-biased gene conversion in differentially driving base composition on the two sex chromosomes. A male-to-female (M:F) expression ratio of close to one for recombining genes and close to two for Z-linked genes lacking a W copy show that dosage compensation is essentially absent. Some gametologous genes have retained active expression of the W copy in females (giving a M:F ratio of 1 for the gametologous gene pair), whereas for others W expression has become severely reduced resulting in a M:F ratio of close to 2. These observations resemble the patterns of sex chromosome evolution seen in other avian and mammalian lineages, suggesting similar underlying evolutionary processes, although the rate of sex chromosome differentiation has been atypically low. Lack of dosage compensation may be a factor hindering sex chromosome evolution in this lineage.

    Keywords
    Z chromosome, W chromosome, evolutionary strata, gametologs, nonrecombining chromosome, biased gene conversion
    National Category
    Biochemistry and Molecular Biology Evolutionary Biology Genetics
    Identifiers
    urn:nbn:se:uu:diva-228463 (URN)10.1093/molbev/msu101 (DOI)000337067400013 ()
    Available from: 2014-07-16 Created: 2014-07-15 Last updated: 2019-03-25Bibliographically approved
    2. A Genetic Map of Ostrich Z Chromosome and the Role of Inversions in Avian Sex Chromosome Evolution
    Open this publication in new window or tab >>A Genetic Map of Ostrich Z Chromosome and the Role of Inversions in Avian Sex Chromosome Evolution
    2018 (English)In: Genome Biology and Evolution, ISSN 1759-6653, E-ISSN 1759-6653, Vol. 10, no 8, p. 2049-2060Article in journal (Refereed) Published
    Abstract [en]

    Recombination arrest is a necessary step for the evolution of distinct sex chromosomes. Structural changes, such as inversions, may represent the mechanistic basis for recombination suppression and comparisons of the structural organization of chromosomes as given by chromosome-level assemblies offer the possibility to infer inversions across species at some detail. In birds, deduction of the process of sex chromosome evolution has been hampered by the lack of a validated chromosome-level assembly from a representative of one of the two basal clades of modern birds, Paleognathae. We therefore developed a high-density genetic linkage map of the ostrich Z chromosome and used this to correct an existing assembly, including correction of a large chimeric superscaffold and the order and orientation of other superscaffolds. We identified the pseudoautosomal region as a 52 Mb segment (approximate to 60% of the Z chromosome) where recombination occurred in both sexes. By comparing the order and location of genes on the ostrich Z chromosome with that of six bird species from the other major Glade of birds (Neognathae), and of reptilian outgroup species, 25 Z-linked inversions were inferred in the avian lineages. We defined Z chromosome organization in an early avian ancestor and identified inversions spanning the candidate sex-determining DMRT1 gene in this ancestor, which could potentially have triggered the onset of avian sex chromosome evolution. We conclude that avian sex chromosome evolution has been characterized by a complex process of probably both Z-linked and W-linked inversions (and/or other processes). This study illustrates the need for validated chromosome-level assemblies for inference of genome evolution.

    Place, publisher, year, edition, pages
    OXFORD UNIV PRESS, 2018
    Keywords
    sex chromosomes, inversions, assembly correction, linkage analysis
    National Category
    Genetics
    Identifiers
    urn:nbn:se:uu:diva-365830 (URN)10.1093/gbe/evy163 (DOI)000444553900017 ()30099482 (PubMedID)
    Funder
    Swedish Research CouncilKnut and Alice Wallenberg Foundation
    Available from: 2018-11-26 Created: 2018-11-26 Last updated: 2019-03-25Bibliographically approved
    3. Variation in the Z Chromosome to Autosomes Ratio of Genetic Diversity across Birds and its Relationship to the Fast-Z effect
    Open this publication in new window or tab >>Variation in the Z Chromosome to Autosomes Ratio of Genetic Diversity across Birds and its Relationship to the Fast-Z effect
    (English)Manuscript (preprint) (Other academic)
    Keywords
    sex chromosomes, genetic diversity, Fast-Z evolution, genetic drift, selection
    National Category
    Evolutionary Biology
    Research subject
    Biology with specialization in Evolutionary Genetics
    Identifiers
    urn:nbn:se:uu:diva-380263 (URN)
    Available from: 2019-03-25 Created: 2019-03-25 Last updated: 2019-04-09
    4. Patterns of Nucleotide Diversity and Linkage Disequilibrium along the Ostrich Pseudoautosomal Region
    Open this publication in new window or tab >>Patterns of Nucleotide Diversity and Linkage Disequilibrium along the Ostrich Pseudoautosomal Region
    Show others...
    (English)Manuscript (preprint) (Other academic)
    Keywords
    sex chromosomes, pseudoautosomal region, genetic diversity, linkage disequilibrium
    National Category
    Evolutionary Biology
    Research subject
    Biology with specialization in Evolutionary Genetics
    Identifiers
    urn:nbn:se:uu:diva-380265 (URN)
    Available from: 2019-03-25 Created: 2019-03-25 Last updated: 2019-03-25
  • 238907.
    Yazdi, Homa Papoli
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Evolutionary Biology.
    Ellegren, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Evolutionary Biology.
    A Genetic Map of Ostrich Z Chromosome and the Role of Inversions in Avian Sex Chromosome Evolution2018In: Genome Biology and Evolution, ISSN 1759-6653, E-ISSN 1759-6653, Vol. 10, no 8, p. 2049-2060Article in journal (Refereed)
    Abstract [en]

    Recombination arrest is a necessary step for the evolution of distinct sex chromosomes. Structural changes, such as inversions, may represent the mechanistic basis for recombination suppression and comparisons of the structural organization of chromosomes as given by chromosome-level assemblies offer the possibility to infer inversions across species at some detail. In birds, deduction of the process of sex chromosome evolution has been hampered by the lack of a validated chromosome-level assembly from a representative of one of the two basal clades of modern birds, Paleognathae. We therefore developed a high-density genetic linkage map of the ostrich Z chromosome and used this to correct an existing assembly, including correction of a large chimeric superscaffold and the order and orientation of other superscaffolds. We identified the pseudoautosomal region as a 52 Mb segment (approximate to 60% of the Z chromosome) where recombination occurred in both sexes. By comparing the order and location of genes on the ostrich Z chromosome with that of six bird species from the other major Glade of birds (Neognathae), and of reptilian outgroup species, 25 Z-linked inversions were inferred in the avian lineages. We defined Z chromosome organization in an early avian ancestor and identified inversions spanning the candidate sex-determining DMRT1 gene in this ancestor, which could potentially have triggered the onset of avian sex chromosome evolution. We conclude that avian sex chromosome evolution has been characterized by a complex process of probably both Z-linked and W-linked inversions (and/or other processes). This study illustrates the need for validated chromosome-level assemblies for inference of genome evolution.

  • 238908.
    Yazdi, Homa Papoli
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Evolutionary Biology.
    Ellegren, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Evolutionary Biology.
    Old but Not (So) Degenerated-Slow Evolution of Largely Homomorphic Sex Chromosomes in Ratites2014In: Molecular biology and evolution, ISSN 0737-4038, E-ISSN 1537-1719, Vol. 31, no 6, p. 1444-1453Article in journal (Refereed)
    Abstract [en]

    Degeneration of the nonrecombining chromosome is a common feature of sex chromosome evolution, readily evident by the presence of a pair of largely heteromorphic chromosomes, like in eutherian mammals and birds. However, in ratites (order Palaeognathae, including, e.g., ostrich), the Z and W chromosomes are similar in size and largely undifferentiated, despite avian sex chromosome evolution was initiated > 130 Ma. To better understand what may limit sex chromosome evolution, we performed ostrich transcriptome sequencing and studied genes from the nonrecombining region of the W chromosome. Fourteen gametologous gene pairs present on the W chromosome and Z chromosome were identified, with synonymous sequence divergence of 0.027-0.177. The location of these genes on the Z chromosome was consistent with a sequential increase in divergence, starting 110-157 and ending 24-30 Ma. On the basis of the occurrence of Z-linked genes hemizygous in females, we estimate that about one-third of the Z chromosome does not recombine with the W chromosome in female meiosis. Pairwise d(N)/d(S) between gametologs decreased with age, suggesting strong evolutionary constraint in old gametologs. Lineage-specific d(N)/d(S) was consistently higher in W-linked genes, in accordance with the lower efficacy of selection expected in nonrecombining chromosomes. A higher ratio of GC > AT:AT > GC substitutions in W-linked genes supports a role for GC-biased gene conversion in differentially driving base composition on the two sex chromosomes. A male-to-female (M:F) expression ratio of close to one for recombining genes and close to two for Z-linked genes lacking a W copy show that dosage compensation is essentially absent. Some gametologous genes have retained active expression of the W copy in females (giving a M:F ratio of 1 for the gametologous gene pair), whereas for others W expression has become severely reduced resulting in a M:F ratio of close to 2. These observations resemble the patterns of sex chromosome evolution seen in other avian and mammalian lineages, suggesting similar underlying evolutionary processes, although the rate of sex chromosome differentiation has been atypically low. Lack of dosage compensation may be a factor hindering sex chromosome evolution in this lineage.

  • 238909.
    Yckenberg, Johan Jacob
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Philosophy.
    Aphorismi, elementa eruditionis humanae præcipua leviter adumbrantes, quos ... modesto offerunt examini auctor, mag. Johannes Jac. Yckenberg ... & respondens Petrus Ögren uplandus. In auditorio Gust. d. [31] maji anni MDCCLXX.1770Dissertation (older thesis) (Other academic)
  • 238910.
    Yckenberg, Sven
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Philosophy.
    De fatis musices in Svecia dissertatio cujus partem posteriorem cons. ampl. fac. philos. Ups. publico examini deferunt Sveno Yckenberg, philos. magist. et Car. Ax. Juringius, Ostrogothi. In audit. Gust. maj. die VIII Junii MDCCXCVIII. H. a. m. s.1798Dissertation (older thesis) (Other academic)
  • 238911.
    Ydenius, Thomas
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.
    Bolin, Patrick
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.
    Joint ventures inverkan på aktiekursen: En eventstudie på den svenska marknaden2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Internationaliseringen av näringslivet har lett till att svenska företag tenderar att samarbeta mer med andra bolag. Exempel på en sådan samarbetsform är joint ventures, det innebär att två eller fler företag bildar ett nytt samägt bolag. Syftet med denna studie är att undersöka om det uppstår abnormal avkastning hos svenska företag vid tillkännagivandet av ett ingått joint venture. Vidare undersöks som underliggande faktorer om nationella och internationella joint ventures och relativa storleksskillnaden mellan moderbolagen påverkar en eventuell abnormal avkastning. Studien är kvantitativ och för att undersöka marknadsreaktionen används en eventstudie. Urvalet består av 198 joint ventures från perioden 2000-2016 som ingåtts av företag noterade på NASDAQ OMX Stockholm large, mid och small cap. Resultatet visar att det generellt uppstår en positiv abnormal avkastning i samband med tillkännagivandet av ett ingått joint venture. Dock tycks ingen av de undersökta faktorerna vara drivande bakom marknadsreaktionen.

  • 238912.
    Ydrefelt, Vera
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Arts, Department of Literature.
    En mor "att lita på": En analys av moderskap och psykisk sjukdom i Oktoberbarn och Jag vill inte dö, jag vill bara inte leva2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I den här uppsatsen studeras hur modrande i relation till psykisk sjukdom och kulturella moderskapsideal gestaltas i Linda Boström Knausgårds roman Oktoberbarn samt Ann Heberleins verk Jag vill inte dö, jag vill bara inte leva. Tematiken undersöks med hjälp av feministisk moderskapsforskning som visar hur föreställningar om det ”goda moderskapet” påverkar mödrar i stor grad. Idealen kan tyckas ouppnåeliga och i samband med psykisk sjukdom innebär de en stor press då huvudpersonerna inte bara måste hantera sina egna och andras förväntningar på dem som mödrar, utan även sjukdomens inverkan på sig själva och sin omgivning. Berättarjagen lider av bipolär sjukdom och upplever svår depression, och i berättelserna gestaltas känslor som självhat, dödslängtan och hopplöshet. Att som mor vara drabbad av depression är tabubelagt och psykisk sjukdom innebär i sig en stigmatisering vilket protagonisterna är medvetna om. Skam genomsyrar berättelserna och känslan är knuten till upplevelsen av att vara otillräcklig som mor, men även till hur de erfar att vara ”avvikande” på grund av den psykiska sjukdomen. De litterära gestaltningarna uttrycker en längtan efter ”normalitet” och efter att vara stabila mödrar som de själva och omgivningen kan lita på.

  • 238913.
    Ydrefors, Anton
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Informatics and Media.
    Örn, Mikael
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Informatics and Media.
    Säker Internet of Things-kommunikation: XMPP och distribuerade sociala nätverk analyserat enligt OWASP top 10 Internet of Things Vulnerabilities2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 238914.
    Ye, Chen
    et al.
    Univ Gothenburg, Dept Chem & Mol Biol, S-41296 Gothenburg, Sweden.
    Gray, Victor
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. Univ Cambridge, Dept Phys, Cavendish Lab, 19 JJ Thompson Ave, Cambridge CB3 0HE, England.
    Kushwaha, Khushbu
    Univ Gothenburg, Dept Chem & Mol Biol, S-41296 Gothenburg, Sweden.
    Kumar Singh, Sandeep
    Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden.
    Erhart, Paul
    Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden.
    Borjesson, Karl
    Univ Gothenburg, Dept Chem & Mol Biol, S-41296 Gothenburg, Sweden.
    Optimizing photon upconversion by decoupling excimer formation and triplet triplet annihilation2020In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 22, no 3, p. 1715-1720Article in journal (Refereed)
    Abstract [en]

    Perylene is a promising annihilator candidate for triplet-triplet annihilation photon upconversion, which has been successfully used in solar cells and in photocatalysis. Perylene can, however, form excimers, reducing the energy conversion efficiency and hindering further development of TTA-UC systems. Alkyl substitution of perylene can suppress excimer formation, but decelerate triplet energy transfer and triplet-triplet annihilation at the same time. Our results show that mono-substitution with small alkyl groups selectively blocks excimer formation without severly compromising the TTA-UC efficiency. The experimental results are complemented by DFT calculations, which demonstrate that excimer formation is suppressed by steric repulsion. The results demonstrate how the chemical structure can be modified to block unwanted intermolecular excited state relaxation pathways with minimal effect on the preferred ones.

  • 238915.
    Ye, Chen
    et al.
    Univ Gothenburg, Dept Chem & Mol Biol, Kemigarden 4, Gothenburg, Sweden.
    Gray, Victor
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. Chalmers Univ Technol, Dept Chem & Biol Engn Organ Chem, SE-41296 Gothenburg, Sweden;Univ Cambridge, Dept Phys, Cavendish Lab, 19 JJ Thompson Ave, Cambridge CB3 0HE, England.
    Mårtensson, Jerker
    Chalmers Univ Technol, Dept Chem & Biol Engn Organ Chem, SE-41296 Gothenburg, Sweden.
    Börjesson, Karl
    Univ Gothenburg, Dept Chem & Mol Biol, Kemigarden 4, Gothenburg, Sweden.
    Annihilation Versus Excimer Formation by the Triplet Pair in Triplet-Triplet Annihilation Photon Upconversion2019In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 141, no 24, p. 9578-9584Article in journal (Refereed)
    Abstract [en]

    The triplet pair is the key functional unit in triplet-triplet annihilation photon upconversion. The same molecular properties that stabilize the triplet pair also allow dimers to form on the singlet energy surface, creating an unwanted energy relaxation pathway. Here we show that excimer formation most likely is a consequence of a triplet dimer formed before the annihilation event. Polarity-dependent studies were performed to elucidate how to promote wanted emission pathways over excimer formation. Furthermore, we show that the yield of triplet-triplet annihilation is increased in higher-viscosity solvents. The results will bring new insights in how to increase the upconversion efficiency and how to avoid energy-loss channels.

  • 238916. Ye, F
    et al.
    Chi, S X
    Fernandez-Baca, J A
    Moreo, A
    Dagotto, E
    Lynn, J W
    Mathieu, Roland
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Kaneko, Y
    Tokura, Y
    Dai, P C
    Electronic Self-Organization in the Single-Layer Manganite Pr1-xCa1+xMnO42009In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 103, no 16Article in journal (Refereed)
    Abstract [en]

    We use neutron scattering to investigate the doping evolution of the magnetic correlations in the single-layer manganite Pr1-xCa1-xMnO4, away from the x = 0.5 composition where the CE-type commensurate antiferromagnetic (AF) structure is stable. We find that short-range incommensurate spin correlations develop as the system is electron doped (x < 0.5), which coexist with the CE-type AF order. This suggests that electron doping in this system induces an inhomogeneous electronic self-organization, where commensurate AF patches with x = 0.5 are separated by electron-rich domain walls with short-range magnetic correlations. This behavior is strikingly different than for the perovskite Pr1-xCaxMnO3, where the long-range CE-type commensurate AF structure is stable over a wide range of electron or hole doping around x = 0.5.

  • 238917.
    Ye, Hui
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics, Analysis and Applied Mathematics.
    A Comparison of Local Volatility and Implied Volatility2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 238918.
    Ye, Huijuan
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Law, Department of Law.
    Using MFN to avoid time-bar provisions: Are time-bar provisions substantive or procedural?2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
  • 238919. Ye, S. -Y
    et al.
    Gurnett, D. A.
    Kurth, W. S.
    Averkamp, T. F.
    Morooka, M.
    Sakai, S.
    Wahlund, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Electron density inside Enceladus plume inferred from plasma oscillations excited by dust impacts2014In: Journal of Geophysical Research-Space Physics, ISSN 2169-9380, Vol. 119, no 5, p. 3373-3380Article in journal (Refereed)
    Abstract [en]

    Enceladus' southern plume is one of the major discoveries of the Cassini mission. The water neutrals and water ice particles (dust) ejected by the cryovolcanic activity populate Saturn's E ring and the neutral torus, and they interact with the plasma environment of Saturn's magnetosphere. The plasma neutrality inside Enceladus' plume has been shown by the Langmuir probe measurement to be modified by the presence of the dust particles. We present an independent method of determining the electron density inside the plume. Sometimes, after dust impacts, plasma oscillations (ringing) were detected by the Cassini Radio and Plasma Wave Science instrument. The frequencies of these oscillations have been shown to be consistent with the local plasma frequency, thus providing a measurement of the local electron density.

  • 238920. Ye, S. -Y
    et al.
    Kurth, W. S.
    Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA.
    Hospodarsky, G. B.
    Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA.
    Persoon, A. M.
    Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA.
    Sulaiman, A. H.
    Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA.
    Gurnett, D. A.
    Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA.
    Morooka, Michiko
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Wahlund, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Hsu, H. -W
    Sternovsky, Z.
    Univ Colorado, LASP, Boulder, CO 80309 USA.
    Wang, X.
    Univ Colorado, LASP, Boulder, CO 80309 USA.
    Horanyi, M.
    Univ Colorado, LASP, Boulder, CO 80309 USA.
    Seiss, M.
    Univ Potsdam, Inst Phys & Astron, Potsdam, Germany.
    Srama, R.
    Univ Stuttgart, Inst Space Syst IRS, Stuttgart, Germany.
    Dust Observations by the Radio and Plasma Wave Science Instrument During Cassini's Grand Finale2018In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 45, no 19, p. 10101-10109Article in journal (Refereed)
    Abstract [en]

    Dust particles in the Saturn system can be detected by the Radio and Plasma Wave Science (RPWS) instrument on board Cassini via antenna voltage signals induced by dust impacts. These impact signals have been simulated in the laboratory by accelerating dust particles onto a Cassini model with electric field antennas. RPWS dust measurements have been shown to be consistent with the Cosmic Dust Analyzer. During the Grand Finale orbits, Cassini flew through the gap between the D ring and Saturn's atmosphere 22 times. In situ measurements by RPWS helped quantify the hazards posed to the spacecraft and instruments on board, which showed a micron-sized dust density orders of magnitude lower than that observed during the Ring Grazing orbits. Close inspection of the waveforms indicated a possible dependence of the impact signal decay time on ambient plasma density. Plain Language Summary Cassini flew through the gap between Saturn and its rings for 22 times before plunging into the atmosphere of Saturn, ending its 20-year mission. The radio and plasma waves instrument on board Cassini helped quantify the dust hazard in this previously unexplored region. The measured density of large dust particles was much lower than expected, allowing high-value science observations during the subsequent Grand Finale orbits.

  • 238921.
    Ye, Shuyu
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.
    Shen, Xin
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.
    Yang, Lei
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.
    Motivation to participate in Ant Forest2019Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    As the largest third-party payment platform in China, Alipay has joined the team of

    making the world greener with the embedded cute mini APP--Ant Forest. Why are so

    many Alipay users willing to plant trees through Ant Forest? What are the motivations

    that affect their continued planting for months or even years? Based on the previous

    literature, we outlined a new framework to investigate the motivation in Ant Forest. The

    data were collected through a pilot study and semi-structured interviews with fourteen

    Chinese Alipay users; at the same time, they are Ant Forest participants. This article

    analyzes how intrinsic motivations (enjoyment, fulfillment, altruism, social interaction,

    identification), extrinsic motivations (external rewards, reciprocity, competition)

    influencing Chinese users to participate in Ant Forest, and whether these motivations

    have different influences and relationships when motivating participants. What’s more,

    we can through intrinsic motivation and extrinsic motivation to know how a mini-app

    that aggregates multiple features can attract users' continued participation, and give

    suggestions to the firm.

  • 238922.
    Ye, Sofie
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC.
    Rhodium-Catalyzed Hydroarylation of Fullerene C60 with Boronic Acids2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 238923. Ye, W
    et al.
    Ekström, A M
    Hansson, L-E
    Bergström, R
    Uppsala University, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Faculty of Social Sciences, Department of Information Science.
    Nyrén, O
    Tobacco, alcohol and the risk of gastric cancer by sub-site and histologic type1999In: Int J Cancer, Vol. 83, p. 223-229Article in journal (Refereed)
  • 238924. Ye, Wei
    et al.
    Liu, Chang-Wei
    Ricco, Jean-Baptiste
    Mani, Kevin
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences, Vascular Surgery.
    Zeng, Rong
    Jiang, Jingmei
    Early and late outcomes of percutarreous treatment of TransAtlantic Inter-Society Consensus class C and D aorto-iliac lesions2011In: Journal of Vascular Surgery, ISSN 0741-5214, E-ISSN 1097-6809, Vol. 53, no 6, p. 1728-1737Article, review/survey (Refereed)
    Abstract [en]

    Objectives: The aim of this study was to analyze the technical success and long-term patency of the endovascular treatment of TransAtlantic Inter-Society Consensus (TASC) C and D aorto-iliac arterial lesions. Methods: All studies reporting original series of patients published in English between 2000 and 2010 were enrolled into meta-analysis. Separate meta-analyses were performed for groups with immediate technical success, 12-month patency, and long-term outcomes. Subgroup analyses were performed to determine if there were differences in outcomes between patients with varying types of lesions (TASC C or D lesions) or between different stenting strategies, including primary or selective stenting. Results: Sixteen articles consisting of 958 patients were enrolled in this meta-analysis. The pooled estimate for technical success was 92.8% (95% confidence interval [CI], 89.8%-95.0%, 749 cases). Primary patency at 12 months was 88.7% (95% CI, 85.9%-91.0%, 787 cases). Subgroup analyses demonstrated a technical success rate of 93.7% (95% CI, 88.9%-96.5%) and a 12-month primary patency rate of 89.6% (95% CI, 84.8%-93.0%) for TASC C lesions. For TASC D lesions, these rates were 90.1% (95% CI, 76.6%-96.2%) and 87.3% (95% CI, 82.5%-90.9%), respectively. The technical success and 12-month primary patency rates for primary stenting were 94.2% (95% CI, 91.8%-95.9%) and 92.1% (95% CI, 89.0%-94.3%), respectively; for selective stenting, these rates were 88.0% (95% CI, 67.9%-96.2%) and 82.9% (95% CI, 72.2%-90.0%), respectively. The long-term, primary patency rates for patients receiving primary stenting were significantly better than those receiving selective stenting. Publication bias was not significant for these analyses. Conclusions: This study demonstrates that early and midterm outcomes of endovascular treatment for TASC C and D aorto-iliac lesions were acceptable, with a better patency for primary stenting than selective stenting.

  • 238925. Ye, Weihua
    et al.
    Lind, Jesper
    Eriksson, Jonny
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC, Analytical Chemistry.
    Maler, Lena
    Characterization of the Morphology of Fast-Tumbling Bicelles with Varying Composition2014In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 30, no 19, p. 5488-5496Article in journal (Refereed)
    Abstract [en]

    Small, fast-tumbling bicelles are frequently used in solution NMR studies of protein lipid interactions. For this purpose it is critical to have information about the organization of the lipids within the bicelle structure. We have studied the morphology of small, fast-tumbling bicelles containing DMPC and DHPC as a function of temperature, lipid concentration, and the relative ratio (q value) of lipid (DMPC) to detergent (DHPC) amounts. Dynamic light scattering and cryo-transmission electron microscopy techniques were used to measure the size of the bicelles and to monitor the shape and dispersity of the particles in the samples. The stability and size of DMPC-containing bicelle mixtures were found to be highly dependent on temperature and the total lipid concentration for mixtures with q = 1 and q = 1.5. Stable DMPC/DHPC bicelles are only formed at low q values (0.5). Bicelle mixtures with q > 0.5 appear to be multidisperse containing more than one component, one with r(H) around 2.5 nm and one with r(H) of 6-8 nm. This is interpreted as a coexistence of small (possibly mixed micelles) bicelles and much larger bicelles. Incubating the sample at 37 degrees C increases the phase separation. Moreover, low total amphiphile concentrations and low q values lead to the formation of a temperature-independent morphology, interpreted as the formation of small particles in which the DHPC and DMPC are more mixed. On the basis of these results, we propose the existence of a critical bicelle concentration, a parameter that determines the existence of bilayered bicelles, which varies with q value. This polymorphism was not observed at any concentrations for q = 0.5 bicelles, for which a small but detectable temperature dependence was observed at high concentrations. The results demonstrate that q = 0.5 mixtures predominantly form "classical" bicelles, but that caution is needed when using fast-tumbling mixtures with q values higher than 0.5.

  • 238926. Ye, Weimin
    et al.
    Held, Maria
    Enroth, Helena
    Kraaz, Wolfgang
    Engstrand, Lars
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Medical Sciences.
    Nyrén, Olof
    Histology and culture results among subjects with antibodies to CagA but no evidence of Helicobacter pylori infection with IgG ELISA.2005In: Scand J Gastroenterol, ISSN 0036-5521, Vol. 40, no 3, p. 312-8Article in journal (Refereed)
  • 238927. Ye, Weimin
    et al.
    Held, Maria
    Lagergren, Jesper
    Engstrand, Lars
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Medical Sciences. Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Medical Sciences.
    Blot, William J
    McLaughlin, Joseph K
    Nyrén, Olof
    Helicobacter pylori infection and gastric atrophy: risk of adenocarcinoma and squamous-cell carcinoma of the esophagus and adenocarcinoma of the gastric cardia.2004In: J Natl Cancer Inst, ISSN 1460-2105, Vol. 96, no 5, p. 388-96Article in journal (Other scientific)
  • 238928. Ye, Xuchun
    et al.
    Li, Xianghu
    Liu, Jian
    Xu, Chong-Yu
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Zhang, Qi
    Variation of reference evapotranspiration and its contributing climatic factors in the Poyang Lake catchment, China2014In: Hydrological Processes, ISSN 0885-6087, E-ISSN 1099-1085, Vol. 28, no 25, p. 6151-6162Article in journal (Refereed)
    Abstract [en]

    By using linear regression (parametric), Mann–Kendall (nonparametric) and attribution analysis methods, this study systematically analysed the changing properties of reference evapotranspiration (ETr) calculated using the Penman–Monteith method over the Poyang Lake catchment during 1960–2008 and investigated the contribution of major climatic variables to ETr changes and their temporal evolution. Generally, a significant decreasing trend of annual ETr is found in the catchment. The decrease of annual ETr in the Poyang Lake basin is mostly affected by the decline of summer ETr. Over the study period, climatic variables, i.e. sunshine duration (SD), relative humidity (RH), wind speed (WS) and vapour pressure all showed decreasing trends, whereas mean daily temperature (DT) increased significantly. Multivariate regression analysis indicated that SD is the most sensitive climatic variable to the variability of ETr on annual basis, followed by RH, WS and DT, whereas the effect of vapour pressure is obscure. Although recent warming trend and decrease of relative humidity over the catchment could have increased ETr, the combined effect of shortened SD and reduced WS negated the effect and caused significant decrease of ETr. Our investigation reveals that the relative contributions of climatic variables to ETr are temporally unstable and vary considerably with large fluctuation. In consideration of the changes of climatic variables over time, further analysis indicated that changes of mean annual ETr in 1970–2008 were primarily affected by SD followed by WS, RH and DT with reference to 1960s. However, WS became the predominant factor during the period 2000–2008 compared with reference period 1960s, and followed by SD.

  • 238929.
    Ye, Xuchun
    et al.
    Southwest Univ, Sch Geog Sci, Chongqing 400715, Peoples R China..
    Li, Xianghu
    Chinese Acad Sci, Nanjing Inst Geog & Limnol, Key Lab Watershed Geog Sci, Nanjing 210008, Jiangsu, Peoples R China..
    Xu, Chong-Yu
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. Univ Oslo, Dept Geosci, Oslo, Norway..
    Zhang, Qi
    Chinese Acad Sci, Nanjing Inst Geog & Limnol, Key Lab Watershed Geog Sci, Nanjing 210008, Jiangsu, Peoples R China.;Jiangxi Normal Univ, Key Lab Poyang Lake Wetland & Watershed Res, Minist Educ, Nanchang 330000, Jiangxi, Peoples R China..
    Similarity, difference and correlation of meteorological and hydrological drought indices in a humid climate region - the Poyang Lake catchment in China2016In: HYDROLOGY RESEARCH, ISSN 1998-9563, Vol. 47, no 6, p. 1211-1223Article in journal (Refereed)
    Abstract [en]

    Based on the estimation of standardized precipitation-evapotranspiration index (SPEI) and standardized runoff index (SRI), this study investigated the variability and correlation of hydrological drought and meteorological drought in a humid climate region - the Poyang Lake catchment in China. Results indicate that the occurrences of hydrological droughts in the catchment are different from those of meteorological drought on both a seasonal and annual basis. However, annual variability of both indices showed the same periodic variation characteristics during the study period. With comparison of the performance of SPEI and SRI time series at different timescales, our observation reveals that the two drought indices show a higher degree of similarity and correlation as timescales increased. In addition, SRI is found to be less variable than SPEI at shorter timescales and it shows an obvious hydrologic delay of about 1-2 months in response to SPEI at timescales > 12 months. Due to hydrologic detention of subsurface soil moisture, shallow groundwater and perhaps reservoir storage, a 2-month timescale of SPEI is found to be more appropriate for river discharge monitoring, especially for those rivers with similar drainage area, climate and geographical conditions as in this study region.

  • 238930. Ye, Xuchun
    et al.
    Zhang, Qi
    Liu, Jian
    Li, Xianghu
    Xu, Chong-yu
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Distinguishing the relative impacts of climate change and human activities on variation of streamflow in the Poyang Lake catchment, China2013In: Journal of Hydrology, ISSN 0022-1694, E-ISSN 1879-2707, Vol. 494, p. 83-95Article in journal (Refereed)
    Abstract [en]

    Under the background of global climate change and local anthropogenic stresses, many regions of the world have suffered from frequent droughts and floods in recent decades. Assessing the relative effect of climate change and human activities is essential not only for understanding the mechanism of hydrological response in the catchment, but also for local water resources management as well as floods and droughts protection. The Poyang Lake catchment in the middle reaches of the Yangtze River has experienced significant changes in hydro-climatic variables and human activities during the past decades and therefore provides an excellent site for studying the hydrological impact of climate change and human activities. In this study, the characteristics of hydro-climatic changes of the Poyang Lake catchment were analyzed based on the observed data for the period 1960-2007. The relative effect of climate change and human activities was first empirically distinguished by a coupled water and energy budgets analysis, and then the result was further confirmed by a quantitative assessment. A major finding of this study is that the relative effects of climate change and human activities varied among sub-catchments as well as the whole catchment under different decades. For the whole Poyang Lake catchment, the variations of mean annual streamflow in 1970-2007 were primarily affected by climate change with reference to 1960s, while human activities played a complementary role. However, due to the intensified water utilization, the decrease of streamflow in the Fuhe River sub-catchment in 2000s was primarily affected by human activities, rather than climate change. For the catchment average water balance, quantitative assessment revealed that climate change resulted in an increased annual runoff of 75.3-261.7 mm in 1970s-2000s for the Poyang Lake catchment, accounting for 105.0-212.1% of runoff changes relative to 1960s. However, human activities should be responsible for the decreased annual runoff of 5.4-56.3 mm in the other decades, accounting for -5.0% to -112.1% of runoff changes. It is noted that the effects of human activities including soil conservation, water conservancy projects and changes in land cover might accumulate or counteract each other simultaneously, and attempts were not made in this paper to further distinguish them.

  • 238931.
    Ye, Zou
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, FREIA.
    Challenges and Status of the ESSnuSB Accumulator Design2018Conference paper (Other academic)
    Abstract [en]

    The 2.0 GeV, 5 MW proton linac for the European Spallation Source, ESS, will have the capacity to accelerate additional pulses, interleaved with the proton pulses for neutron production, and send them to a neutrino target, providing an excellent opportunity to produce an unprecedented high- performance neutrino beam, the ESS neutrino Super Beam (ESSnuSB), to measure, with precision, the CP violating phase at the 2nd oscillation maximum. In order to comply with the acceptance of the target and horn systems that will form the neutrino super beam, the long pulses from the linac must be compressed by about three orders of magnitude with minimal particle loss, something that will be achieved in an accumulator ring. This ring will accommodate about 1015 protons, which means that several design challenges are encountered. Strong space charge forces, low-loss injection, efficient collimation, and e-p instabilities are some of the aspects central to the design work. Different pulse structures and injection painting schemes have been studied, with the goal of mitigating space charge effects and of minimizing the heating of the stripping foil despite the very high beam intensity. This paper presents the status of the accumulator ring design, with multi- particle simulations of the injection procedure.

  • 238932. Yearby, K. H.
    et al.
    Balikhin, M. A.
    Khotyaintsev, Yuri V.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Walker, S. N.
    Krasnoselskikh, V. V.
    Alleyne, H. St. C. K.
    Agapitov, O.
    Ducted propagation of chorus waves: Cluster observations2011In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 29, no 9, p. 1629-1634Article in journal (Refereed)
    Abstract [en]

    Ducted propagation of whistler waves in the terrestrial magnetosphere-ionosphere system was discussed and studied long before the first in-situ spacecraft measurements. While a number of implicit examples of the existence of ducted propagation have been found, direct observation of ducts has been hampered by the low sampling rates of measurements of the plasma density. The present paper is based on Cluster observations of chorus waves. The ability to use measurements of the spacecraft potential as a proxy for high time resolution electron density measurements is exploited to identify a number of cases when increased chorus wave power, observed within the radiation belts, is observed simultaneously with density enchantments. It is argued that the observation of ducted propagation of chorus implies modification of numerical models for plasma-wave interactions within the radiation belts.

  • 238933.
    Yee Fan, Hiu
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Economics.
    The parental leave insurance in Sweden: A study of the causal effects on average parental leave use by the gender equality bonus reforms in 2008 and 20122015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This paper analyses if the gender equality bonus have any causal effects on average parental leave use. There are two reforms concerning the gender equality bonus. The first is the introduction of the bonus in 2008 and the second is the simplification of the bonus in 2012. Medium-term effects is studied on the first reform and short-term effects on the second. Further, this paper also investigates if there are any indirect differences between high income earners and non-high income earners in their average distribution of parental leave. In this thesis a difference-in-differences approach is used with control and treatment groups right before and after the policy changes. The results indicate that the 2008-reform does not have statistical significant causal effects on average parental leave, even on medium-term. The results are persistent when the studied population is divided into high- and non-high income earners. The reform in 2012 consists of the simplification of the bonus and in addition also the double days, therefore only a net effect of the reform could be estimated. The analysis made for the second reform does indicate significant causal effects on average parental leave use. The result shows that mothers and fathers have statistically increased and decreased their average parental leave on 5 and 10 percent significant level, respectively. This result contradicts to the expectations. If the gender equality bonus would have a causal effect on encouraging parents to share the leave more equally, the opposite results is expected. Analyzing the parents separately, conditioned on their income levels, the non-high income group suggests no statistical significant causal effects on average leave for neither mothers nor fathers. For the high income group, there is a significant increase of mothers’ average use of parental leave by around four percentage points. The significant increase for mothers average parental leave use due to the reform in 2012 is more likely to be explained by the double days rather than the gender equality bonus.

  • 238934.
    Yefanov, Oleksandr
    et al.
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Oberthuer, Dominik
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Bean, Richard
    European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany.
    Wiedorn, Max O.
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany;Univ Hamburg, Ctr Ultrafast Imaging, Luru Chaussee 149, D-22761 Hamburg, Germany.
    Knoska, Juraj
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Pena, Gisel
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Awel, Salah
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Gumprecht, Lars
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Domaracky, Martin
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Sarrou, Iosifina
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Xavier, P. Lourdu
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Metz, Markus
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Bajt, Sasa
    Deutsch Elekt Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany.
    Mariani, Valerio
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Gevorkov, Yaroslav
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany;Hamburg Univ Technol, Inst Vis Syst, Vis Syst E-2,Harburger Schlossstr 20, D-21079 Hamburg, Germany.
    White, Thomas A.
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Tolstikova, Aleksandra
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Villanueva-Perez, Pablo
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Seuring, Carolin
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Aplin, Steve
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Estillore, Armando D.
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Küpper, Jochen
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany;Univ Hamburg, Ctr Ultrafast Imaging, Luru Chaussee 149, D-22761 Hamburg, Germany;Univ Hamburg, Dept Phys, Luru Chaussee 149, D-22761 Hamburg, Germany.
    Klyuev, Alexander
    Deutsch Elekt Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany.
    Kuhn, Manuela
    Deutsch Elekt Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany.
    Laurus, Torsten
    Deutsch Elekt Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany.
    Graafsma, Heinz
    Deutsch Elekt Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany.
    Monteiro, Diana C. F.
    Univ Hamburg, Ctr Ultrafast Imaging, Luru Chaussee 149, D-22761 Hamburg, Germany;Univ Hamburg, Dept Phys, Luru Chaussee 149, D-22761 Hamburg, Germany.
    Trebbin, Martin
    Univ Buffalo, Dept Chem, 359 Nat Sci Complex, Buffalo, NY 14260 USA;Hauptman Woodward Med Res Inst, 700 Ellicott St, Buffalo, NY 14203 USA.
    Maia, Filipe
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology, Molecular biophysics. Lawrence Berkeley Natl Lab, NERSC, Berkeley, CA 94720 USA.
    Cruz-Mazo, Francisco
    Univ Seville, ETSI, Dept Ingn Aeroespacial & Mecon Fluidos, Seville 41092, Spain.
    Ganan-Calvo, Alfonso M.
    Univ Seville, ETSI, Dept Ingn Aeroespacial & Mecon Fluidos, Seville 41092, Spain.
    Heymann, Michael
    Univ Stuttgart, Inst Biomat & Biomol Syst, Intelligent Biointegrat Syst Grp, D-70569 Stuttgart, Germany.
    Darmanin, Connie
    La Trobe Univ, La Trobe Inst Mol Sci, ARC Ctr Excellence Adv Mol Imaging, Melbourne, Vic 3086, Australia.
    Abbey, Brian
    La Trobe Univ, La Trobe Inst Mol Sci, ARC Ctr Excellence Adv Mol Imaging, Melbourne, Vic 3086, Australia.
    Schmidt, Marius
    Univ Wisconsin, Phys Dept, 3135 N Maryland Ave, Milwaukee, WI 53211 USA.
    Fromme, Petra
    Arizona State Univ, Sch Mol Sci, Tempe, AZ 85287 USA;Arizona State Univ, Biodesign Ctr Appl Struct Discovery, Tempe, AZ 85287 USA.
    Giewekemeyer, Klaus
    European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany.
    Sikorski, Marcin
    European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany.
    Graceffa, Rita
    European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany.
    Vagovic, Patrik
    European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany.
    Kluyver, Thomas
    European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany.
    Bergemann, Martin
    European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany.
    Fangohr, Hans
    European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany.
    Sztuk-Dambietz, Jolanta
    European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany.
    Hauf, Steffen
    European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany.
    Raab, Natascha
    European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany.
    Bondar, Valerii
    European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany.
    Mancuso, Adrian P.
    European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany;La Trobe Univ, La Trobe Inst Mol Sci, Dept Chem & Phys, Melbourne, Vic 3086, Australia.
    Chapman, Henry
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany;Univ Hamburg, Ctr Ultrafast Imaging, Luru Chaussee 149, D-22761 Hamburg, Germany;Univ Hamburg, Dept Phys, Luru Chaussee 149, D-22761 Hamburg, Germany.
    Barty, Anton
    Deutsch Elekt Synchrotron, Ctr Free Elect Laser Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Evaluation of serial crystallographic structure determination within megahertz pulse trains2019In: STRUCTURAL DYNAMICS-US, ISSN 2329-7778, Vol. 6, no 6, article id 064702Article in journal (Refereed)
    Abstract [en]

    The new European X-ray Free-Electron Laser (European XFEL) is the first X-ray free-electron laser capable of delivering intense X-ray pulses with a megahertz interpulse spacing in a wavelength range suitable for atomic resolution structure determination. An outstanding but crucial question is whether the use of a pulse repetition rate nearly four orders of magnitude higher than previously possible results in unwanted structural changes due to either radiation damage or systematic effects on data quality. Here, separate structures from the first and subsequent pulses in the European XFEL pulse train were determined, showing that there is essentially no difference between structures determined from different pulses under currently available operating conditions at the European XFEL.

  • 238935. Yefenof, E
    et al.
    Ramos, O F
    Nilsson, B
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology.
    Klein, E
    Ligands of CR2 do not interfere with C3 fragment fixation or enhanced NK sensitivity of Raji cells treated with human serum.1989In: Immunology Letters, ISSN 0165-2478, E-ISSN 1879-0542, Vol. 21, no 4, p. 303-306Article in journal (Refereed)
    Abstract [en]

    Raji cells activate the alternative complement pathway (ACP) and fix C3 fragments when incubated in human serum (HS). Earlier experiments have shown that CR2 molecules are involved in this phenomenon and the opsonized cells have elevated sensitivity to the lytic effect of CR3-bearing NK cells. We show here that Raji cells treated with CR2 site-specific ligands, (C3d, OKB-7 and HB-5 mAbs, and a synthetic peptide which binds to CR2) generated and bound C3 fragments after exposure to HS. The elevated lytic sensitivity of HS-treated cells was not altered by the presence of the various CR2 ligands. Thus, the membrane-bound C3 fragments are not fixed at the C3dg receptor binding site.

  • 238936.
    Yeghiazaryan, Sergey
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Industrial Engineering & Management.
    Arroyo, Carlos
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Industrial Engineering & Management.
    Kvalitetssäkring av servicelämnare för skogsbrukets arbetsmaskiner: Intervjuer och förslag till utveckling2012Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this study we have examined the possible quality standards and methods for applications with service workshops in the forest industry. The purpose of the methods presented here was to start the work of standarardising the maintenance service in the industry and be of use for service providers in their quality effort.

    The methods we used to accomplish the study were interviews and field visits together with a comprehensive literature research. Our results are presented in the form of four solution proposals: a standard based on existing SIS standards for terminology and key indicators, checklists that are filled in by mechanics with customer participation, the construction of a instructions database, and the implementation of the method 5s.

    We believe our suggestions can help the service providers in the four problem areas that we have identified: long term strategy, documentation, recruitment of competent technicians, and standard procedures in their operations. These improvements will be beneficial for both the service provider and the customer.

  • 238937.
    Yegorova, Olga
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Informatics and Media.
    #NiUnaMenosBolivia fights back: A discourse theoretical analysis on the struggle against gender-based violence in Bolivia2017Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
    Abstract [en]

    Femicides are not a new phenomenon. Marches involving thousands of people all around the Latin American continent to fight them, however, is. Ni Una Menos - Not one woman less - is the slogan that also mobilized Bolivians to mass-based protests in November 2016.This thesis investigates the counterpublic of #NiUnaMenosBolivia for the purpose of understanding its discursively articulated identities. A multidisciplinary discourse theoretical analysis combines Ernesto Laclau and Chantal Mouffe’s discourse theory with Nancy Fraser’s contributions to the struggle over needs of counterpublics to examine textual, photographic and ethnographic data.Two levels of identities of #NiUnaMenos are extracted from the investigation: Internal agonistic identities pinpoint at the friction between the representors and the represented identities of the counterpublic. A collective identity evolves in the context of the struggle for justice, freedom and dignity through the construction of an antagonistic “Others” who are held responsible for femicidal violence.This study builds a bridge between feminist activism and academic discourse for feminist studies of the region. It further develops and exemplifies a methodological toolkit for a theoretically based discourse analysis on contemporary women’s movements.

  • 238938.
    Yeh, Alexander
    et al.
    Chalmers University of Technology, Gothenburg, Sweden.
    Ratsamee, Photchara
    Osaka University, Osaka, Japan.
    Kiyokawa, Kiyoshi
    Nara Institute of Science and Technology (NAIST), Nara, Japan.
    Uranishi, Yuki
    Osaka University, Osaka, Japan.
    Mashita, Tomohiro
    Osaka University, Osaka, Japan.
    Takemura, Haruo
    Osaka University, Osaka, Japan.
    Fjeld, Morten
    Chalmers University of Technology, Gothenburg, Sweden.
    Obaid, Mohammad
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Visual Information and Interaction. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computerized Image Analysis and Human-Computer Interaction.
    Exploring proxemics for human-drone interaction2017In: Proc. 5th International Conference on Human Agent Interaction, New York: ACM Press, 2017, p. 81-88Conference paper (Refereed)
    Abstract [en]

    We present a human-centered designed social drone aiming to be used in a human crowd environment. Based on design studies and focus groups, we created a prototype of a social drone with a social shape, face and voice for human interaction. We used the prototype for a proxemic study, comparing the required distance from the drone humans could comfortably accept compared with what they would require for a nonsocial drone. The social shaped design with greeting voice added decreased the acceptable distance markedly, as did present or previous pet ownership, and maleness. We also explored the proximity sphere around humans with a social shaped drone based on a validation study with variation of lateral distance and heights. Both lateral distance and the higher height of 1.8 m compared to the lower height of 1.2 m decreased the required comfortable distance as it approached.

  • 238939.
    Yehuwalashet, Ezra
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
    Gravity and Magnetic Survey, Modelling and Interpretation in the Blötberget Iron-Oxide Mining Area, Bergslagen, Sweden2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The Blötberget mining area, the focus of this MSc project, is located about 230 km northwest ofStockholm and 12 km southwest of the city of Ludvika (central Sweden). The mining area has beenknown since 1600 for its various types of mineralization particularly iron-oxide deposits (magnetite andhematite) with the mining commenced in 1944. Previous geoscientific research in the area providesdetailed information about lithological variations and structure of the bedrock near the surface.However, knowledge of the depth extent of the mineral deposits and their host rocks is limited. To shedlights on these issues and support deep mineral exploration potential in the study area, within the recentlylaunched StartGeoDelineation project, new ground gravity data, 180 data points on average 150 m apart,were collected during two field campaigns in 2015 and 2016. Aeromagnetic data were obtained fromthe Geological Survey of Sweden (SGU) to complement the ground gravity measurement interpretationsand modelling. After a careful inspection of the field gravity data, they were reduced to completeBouguer anomaly with a maximum error estimate of about 0.6 mGal due to uncertainty in theinstrumental drift, slab density, geodetic surveying, diurnal variations and terrain (or topography)correction. The Bouguer gravity data after separation of regional field (second order polynomial at theend was used) were used (~ 8 mGal range) for interpretation and 3D inverse modelling. Clear anomalouszones are noticeable in the gravity data particularly due to mineralization and a major boundaryseparating a gravity low from gravity high in the southern part of the study area likely representing afault boundary separating two different lithological units. In my study, both forward and inversemodelling using rudimentary objects/shapes and voxel-type (mesh) approach were carried out. Effect ofinitial and reference models were tested on both gravity and magnetic datasets. While the constrainedmodels have still significant ambiguity, they help to suggest structural control on the location ofmineralization and may allow estimating an excess tonnage due to the presence of mineralization in thestudy area. Due to access limitations (e.g., unable to measure on the water-filled pit) the gravity modelis sensitive to the measuring positions and constraints using known shape of mineralization was not atthe end successful to overcome this. Collecting more gravity data on the target area and repeated test of3D inversion by adjusting the inversion parameters might help to improve the final result.

  • 238940. Yektaei-Karin, Elham
    et al.
    Moshfegh, Ali
    Lundahl, Joachim
    Berggren, Veronica
    Hansson, Lars-Olof
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences.
    Marchini, Giovanna
    The stress of birth enhances in vitro spontaneous and IL-8-induced neutrophil chemotaxis in the human newborn2007In: Pediatric Allergy and Immunology, ISSN 0905-6157, E-ISSN 1399-3038, Vol. 18, no 8, p. 643-651Article in journal (Refereed)
    Abstract [en]

    The birth process induces fetal stress. Stress has profound effects on the immune system, also by acting on the trafficking of leukocytes, a process in which adhesion and chemotaxis are primordial and critical events for the development of effective antimicrobial defenses. The newborn is rapidly challenged by a microflora at the epithelia linings and therefore depending on early, innate immunity onset. The objective of the study was to investigate the immune response in cord blood from newborns in relation to different degrees of fetal stress, with focus on neutrophil chemotaxis. We analyzed in vitro transmigration ability of neutrophils and their CD11b expression, measured total white blood count (WBC) and the major leukocyte populations, interleukin (IL)-8, interferon (IFN)-gamma, and soluble E-Selectin, as well as relevant immuno-modulating hormones in infants born at term after Cesarean section prior to the start of labor (n = 55), normal vaginal delivery (n = 87), and assisted delivery (n = 26). Arterial pH and lactate were used as stress markers. We found that spontaneous and IL-8-induced transmigration ability of neutrophils from newborns after normal delivery was significantly higher compared with that of neutrophils from Cesarean section or from adults. With a progressive increase in fetal stress, there were significant elevations in total WBC, in particular neutrophils and monocytes, as well as an enhanced IL-8 and soluble E-Selectin level. Assisted delivery, associated with the highest degree of fetal stress in addition had an enhanced lymphocyte and monocytes count as well as an increased IFN-gamma level. There were significant direct correlations between neutrophils and monocytes, respectively, with cortisol, beta-endorphin, and prolactin. Interferon-gamma was directly related to dopamine, as well as to the lymphocyte and monocyte count. The setting of the HPA-axis at birth is a promoter of an alarm response and a surge of neuroendocrine immuno-modulating factors that enhances antimicrobial defenses of the newborn. We speculate that IL-8 induced by normal labor may be a priming factor for an increased neutrophil chemotaxis through the pre-activated endothelium of the fetus. Assisted delivery may trigger excessive recruitment of additional inflammatory cells and IFN-gamma release.

  • 238941. Yeloff, D
    et al.
    Bennett, Keith D.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Blaauw, Maarten
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
    Mauquoy, D
    Silassoo, Ü
    van der Plicht, J
    van Geel, B
    High precision C-14 dating of Holocene peat deposits: a comparison of Bayesian calibration and wiggle-matching approaches2006In: Quaternary Geochronology, ISSN 1871-1014, Vol. 1, no 3, p. 222-235Article in journal (Refereed)
    Abstract [en]

    The chronologies of five northern European ombrotrophic peat bogs subjected to a large ANIS C-14 dating effort (32-44 dates/site) are presented here. The results of Bayesian calibration (BCal) of dates with a prior assumption of chronological ordering were compared with a Bayesian wiggle-match approach (Bpeat) which assumes constant linear accumulation over sections of the peat profile. Interpolation of BCal age estimates of dense sequences of C-14 dates showed variable patterns of peat accumulation with time, with changes in accumulation occurring at intervals ranging from 20 to 50 cm. Within these intervals, peat accumulation appeared to be relatively linear. Close analysis suggests that some of the inferred variations in accumulation rate were related to the plant macrofossil composition of the peat. The wiggle-matched age-depth models had relatively high chronological uncertainty within intervals of closely spaced 14 C dates, suggesting that the premise of constant linear accumulation over large sections of the peat profile is unrealistic. Age models based on the assumption of linear accumulation over large parts of a peat core (and therefore only effective over millennial timescales), are not compatible with studies examining environmental change during the Holocene, where variability often occurs at decadal to centennial time-scales. Ideally, future wiggle-match age models should be constrained, with boundaries between sections based on the plant macrofossil composition of the peat and physical-chemical parameters such as the degree of decomposition. Strategies for the selection of material for dating should be designed so that there should be enough C-14 dates to accurately reconstruct the peat accumulation rate of each homogeneous stratigraphic unit.

  • 238942.
    Yemane, Kidane
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Computer Systems. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Relations in Models of Calculi and Logics with Names2006Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    In this thesis we investigate two operational models of name-passing calculi: one based on coalgebra, and one based on enriched automata. We develop a semantic framework for modelling the open bisimulation in π-calculus, hyperbisimulation in Fusion calculus, and the first semantic interpretation of FOλ(nabla) logic.

    We consider a category theoretic model where both “variables” and “names”, usually viewed as separate notions, are particular cases of the more general notion of atoms. The key aspect of this model is to consider functors over the category of irreflexive and symmetric finite relations. The models previously proposed for the separate notions of “variables” and “names” embed faithfully in the new one, and initial algebra/final coalgebra constructions can be transferred from the formers to the latter.

    Moreover, the new model admits a definition of distinction-aware simultaneous substitutions. As a substantial application example, we give the first semantic interpretation of Miller-Tiu's FOλ(nabla) logic. FOλ(nabla) logic is designed for reasoning about operational semantics of languages with binding.

    On the operational level, a contribution of the thesis is to extend an automata-based model for a variety of name-passing calculi with their associated notion of equivalence. HD-automata, a syntax-independent operational model, has been successfully applied for modelling e.g. early and late bisimulation in π-calculus and hyperbisimulation in Fusion calculus. However, current HD-automata are not adequate for modelling open bisimulation because they can not handle distinction-preserving substitutions. We solve this technical problem by integrating the notion of distinction into the definition of named sets, the basic building blocks of HD-automata. Finally, we discuss the relationship between HD-automata with distinctions, and D-LTS.