Change search
Refine search result
2050205120522053205420552056 102601 - 102650 of 105518
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 102601.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kabilan, Vandana
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Enabling Business Process Interoperability Using Contract Workflow Models2005In: 13th International Conference on Cooperative Systems (CooPIS05), 2005, Vol. 3760Conference paper (Refereed)
  • 102602.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kampars, Janis
    Stirna, Janis
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Using Open Data to Support Organizational Capabilities in Dynamic Business Contexts2018In: Advanced Information Systems Engineering Workshops: CAiSE 2018: Proceedings / [ed] Raimundas Matulevičius, Remco Dijkman, Springer, 2018, p. 28-39Conference paper (Refereed)
    Abstract [en]

    In essence, Open Data (OD) is the information available in a machine-readable format and without restrictions on the permissions for using or distributing it. Open Data may include textual artifacts, or non-textual, such as images, maps, scientific formulas, and other. The data can be publicized and maintained by different entities, both public and private. The data are often federated, meaning that various data sources are aggregated in data sets at a single “online” location. Despite its power to distribute free knowledge, OD initiatives face some important challenges related to its growth. In this paper, we consider one of them, namely, the business and technical concerns of OD clients that would make them able to utilize Open Data in their enterprise information systems and thus benefit in terms of improvements of their service and products in continuous and sustainable ways. Formally, we describe these concerns by means of high-level requirements and guidelines for development and run-time monitoring of IT-supported business capabilities, which should be able to consume Open Data, as well as able to adjust when the data updates based on a situational change. We illustrated our theoretical proposal by applying it on the service concerning regional roads maintenance in Latvia.

  • 102603.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kirikova, MariteJohannesson, PaulStockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Advanced Information Systems Engineering: 27th International Conference, CAiSE 2015, Stockholm, Sweden, June 8-12, 2015, Proceedings2015Conference proceedings (editor) (Refereed)
    Abstract [en]

    This book constitutes the proceedings of the 27th International Conference on Advanced Information Systems Engineering, CAiSE 2015, held in Stockholm, Sweden, in June 2015.

    The 31 papers presented in this volume were carefully reviewed and selected from 236 submissions. They were organized in topical sections named: social and collaborative computing; business process modeling and languages; high volume and complex information management; requirements elicitation and management; enterprise data management; model conceptualisation and evolution; process mining, monitoring and predicting; intra- and inter-organizational process engineering; process compliance and alignment; enterprise IT integration and management; and service science and computing. The book also contains the abstracts of 3 keynote speeches and 5 tutorials, presented at the conference.

  • 102604.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kirikova, Marite
    Johannesson, Paul
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Preface to CAISE 20152016In: Information Systems, ISSN 0306-4379, E-ISSN 1873-6076, Vol. 62Article in journal (Other academic)
  • 102605.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Pastor, Oscar
    Loucopoulos, Peri
    Selected Topics on Advances in Capability-Oriented Information Systems Development: Editorial Introduction to Issue 10 of CSIMQ2017In: Complex Systems Informatics and Modeling Quarterly, ISSN 2255-9922, no 10, p. 1-2Article in journal (Other academic)
    Abstract [en]

    Modern organizations need to be sustainable in the presence of dynamically changing business conditions, which require from Information Systems (IS) to address complex challenges for being able to support organizations acting in varying business conditions – changing customer demands, new legislations, new customers, and emerging alliances. From a technical perspective, the gap between business requirements and supporting IS is still present, mostly due to the fact that current IS development approaches operate with artifacts defined on a relatively low abstraction level. To go beyond the state of the art, IS development frameworks used by enterprises need to be structured for solving emerging problems, and enterprises need to have efficient methods for the use of these frameworks to deliver the right IS solutions just-in-time and just-enough. The notion of capability emerged in the beginning of the nineties in the context of competence-based management, military frameworks, and developing organization’s competitive advantage – linguistically, it means the ability or qualities necessary to do something.

  • 102606.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Pastor, Oscar
    Loucopoulos, Peri
    Selected Topics on Business Informatics: Editorial Introduction to Issue 13 of CSIMQ2017In: Complex Systems Informatics and Modeling Quarterly, ISSN 2255-9922, no 13, p. 1-2Article in journal (Other academic)
    Abstract [en]

    Business Informatics is the scientific discipline targeting information processes and related phenomena in their socio-economical business context, including companies, organisations, administrations and society in general. As a field of study, it endeavours to take a systematic and analytic approach in adopting a multi-disciplinary orientation that draws theories and practices from the fields of management science, organisational science, computer science, systems engineering, information systems, information management, social science, and economics information science.

    The objective of this thematic issue is to bring attention to actual research on Business Informatics, as being publicized on the 19th IEEE Conference on Business Informatics (CBI 2017), July 24-27, 2017, in Thessaloniki, Greece. The conference created a productive forum for researchers and practitioners from the fields that contribute to the construction, use and maintenance of information systems and the organisational context in which they are embedded. This issue of CSIMQ comprises extended version of four CBI papers and one external article.

  • 102607.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Pastor, Oscar
    Loucopoulos, Pericles
    On the Capability Notion in Business Informatics: [Opening]2014In: [Proceedings of] The 1st International Workshop on Capability-oriented Business Informatics (CoBI 2014) / [ed] Jelena Zdravkovic, Peri Loucopoulos, Oscar Pastor, 2014, p. 1-2Conference paper (Other academic)
    Abstract [en]

    The business environments of today are changing rapidly, entailing complex anddynamic organizational constellations. Enterprises operating in these conditions needto have the capability to deliver their services in a variety of business contexts withsustainable quality and moreover to leverage them to competitive advantage. Latelythe notion of capability has gained a growing attention, due to a number of factors:the notion directs business investment focus, it can be used as a baseline for businessplanning, and it leads directly to service specification and design.

  • 102608.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Rychkova, Irina
    A Capability-Oriented Approach to IT Governance: The Case of Public Service Organizations2017In: Advanced Information Systems Engineering Workshops: Proceedings / [ed] Andreas Metzger, Anne Persson, Springer, 2017, p. 39-49Conference paper (Refereed)
    Abstract [en]

    Getting more value from IT is becoming a critical objective for today’s organizations. IT Governance is an important strategic instrument that should ensure organizations to succeed with this objective and therefore it needs to be efficiently planned, structured and executed. To respond to increasing service demands while preserving or even increasing the value provided by services, public organizations require resources and abilities that lay outside their boundaries - such as co-production, open innovation, as well as engagement of citizens and partner organizations. To respond to these challenges, public organizations need to employ new governance solutions to their IT to overcome the shortcomings of hierarchical structures and traditional centralized decision-making. In this study, we discuss a capability-oriented governance approach, which aligns envisioned public values with actors, processes and resources and accordingly compound different IT Governance capabilities. We illustrate our proposal on the student mobility case in the Higher Education public service.

  • 102609.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Rychkova, Irina
    Speckert, Thomas
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Requirements for IT Governance in Organizations Experiencing Decentralization2015In: Information Systems Engineering in Complex Environments: CAiSE Forum 2014, Thessaloniki, Greece, June 16-20, 2014, Selected Extended Papers / [ed] Selmin Nurkan, Elias Pimenidis, Springer, 2015, p. 269-285Conference paper (Refereed)
    Abstract [en]

    Decentralization of organizations and subsequent change of their management and operation styles requires changes in organization’s processes and heavily involves the IT. A case study in the Higher Education sector in Sweden has shown that Enterprise Architecture (EA) frameworks fit to primarily centralized organizational structures, and as such have shortcomings when used in decentralized organizations. Overcoming these deficiencies requires some new principles to be introduced and incorporated into the EA knowledge. In particular for IT governance, the case study showed that the peer-to-peer principles, such as peer production, can offer more suitable governance over current EA frameworks as they are able to better match the decentralized components of the university’s organizational structure.

  • 102610.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Stirna, Janis
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Grabis, Janis
    A Comparative Analysis of Using the Capability Notion for Congruent Business and Information Systems Engineering2017In: Complex Systems Informatics and Modeling Quarterly, ISSN 2255-9922, no 10, p. 1-20Article in journal (Refereed)
    Abstract [en]

    The notion of capability has been gaining a growing attention in the business and information system (IS) engineering community due to a number of reasons: it facilitates focus on business investments, it can be used as a baseline for business planning, and it directly leads to service specification and design. It is not however widely known to what extent capability is considered in different modeling approaches, how it is defined, and what purpose it fulfills. This article analyzes how the notion of capability is included in the frameworks spanning from business-oriented such as Business Architecture and Business Value Modeling, to the alignment-oriented represented by Enterprise Architecture (EA), and Enterprise Modeling (EM). The results of the analysis have shown that capability has widespread presence in the frameworks and that its conceptual meaning is largely similar, while the intentions and the mechanisms of its use differ, which raises stimulating opportunities for new contributions and improvements in the field.

  • 102611.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Stirna, Janis
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Grabis, Janis
    Capability Consideration in Business and Enterprise Architecture Frameworks2018In: Capability Management in Digital Enterprises / [ed] Kurt Sandkuhl, Janis Stirna, Cham: Springer, 2018, no 1, p. 41-56Chapter in book (Refereed)
    Abstract [en]

    The notion of capability has gained growing attention over the last few years due to a number of factors, namely, it directs business investment focus, it can be used as a baseline for business planning, and it leads to service specification and design. It is however unexplored to what extent capability is considered in different modeling approaches, how it is defined, integrated with other concepts, and what purpose it fulfills. This chapter presents how the notion of capability is included in the current Business Architecture (BA) and Enterprise Architecture (EA) frameworks. It shows that capability has a considerable role in the frameworks and that they share a largely similar conceptual meaning of capability while the intentions and the mechanisms of its use differ, which raises stimulating opportunities for new contributions and improvements in the field.

  • 102612.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Stirna, Janis
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Henkel, Martin
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Grabis, Janis
    Modelling Business Capabilities and Context Dependent Delivery by Cloud Service2013In: Advanced Information Systems Engineering: Proceedings / [ed] Camille Salinesi, Moira C. Norrie, Óscar Pastor, Springer Berlin/Heidelberg, 2013, p. 369-383Conference paper (Refereed)
    Abstract [en]

    Contemporary business environments are changing rapidly, organizations are global, and cloud-based services have become a norm. Enterprises operating in these conditions need to have the capability to deliver their business in a variety of business contexts. Capability delivery thus has to be monitored and adjusted. Current Enterprise Modeling approaches do not address context-dependent capability design and do not explicitly support runtime adjustments. To address this challenge, a capability-driven approach is proposed to model business capabilities by using EM techniques, and to use model-based patterns to describe how software applications can adhere to changes in the execution context. A meta-model for capability design and delivery is presented with the consideration to delivering solutions as cloud services. The proposal is illustrated with an example case from an energy efficiency project. A supporting architecture for the capability development and the delivery in the cloud is also presented.

  • 102613.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Stirna, Janis
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kirikova, Marite
    Karagiannis, Dimitri
    Winter, Robert
    Advanced Enterprise Modeling: Editorial2015In: Business & Information Systems Engineering, ISSN 1867-0202, Vol. 57, no 1, p. 1-2Article in journal (Other academic)
  • 102614.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Stirna, JanisStockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.Kirikova, MariteKaragiannis, DimitrisWinter, Robert
    Advanced Enterprise Modeling2015Collection (editor) (Refereed)
  • 102615.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Stirna, Janis
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kirikova, Marite
    Karagiannis, Dimitris
    Winter, Robert
    BISE – Call for Papers Issue 1/20152013In: Business & Information Systems Engineering, ISSN 1867-0202, Vol. 5, no 5, p. 361-361Article in journal (Refereed)
  • 102616.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Stirna, Janis
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kuhr, Jan-Christian
    Koç, Hasan
    Requirements Engineering for Capability Driven Development2014In: The Practice of Enterprise Modeling: 7th IFIP WG 8.1 Working Conference, PoEM 2014, Manchester, UK, November 12-13, 2014: proceedings / [ed] Ulrich Frank, Berlin: Springer, 2014, Vol. 197, p. 193-207Conference paper (Refereed)
    Abstract [en]

    Lately, the notion of capability has emerged in IS engineering as an instrument to context dependent design and delivery of business services. Representing core business functionalities of an organization, capabilities, and capability driven IS development can be seen as both – a shift beyond and complement to the widely established service-oriented engineering paradigm where needs of customers form the leading modeling and design perspective. To ensure the needs of business stakeholders for variety of business contexts that an organization faces, and thus facilitate successful systems delivery, capability-driven development needs a well-defined method for requirements engineering, as well as its confirmation in practices. In this paper a process for specifying requirements capabilities and their designs is proposed. An application of the proposed approach to the area of Business Process Outsourcing (BPO) services. is carried out for the German company SIV.

  • 102617.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Stirna, Janis
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Sandkuhl, Kurt
    Future of Capability Management2018In: Capability Management in Digital Enterprises, Cham: Springer, 2018, no 1, p. 385-396Chapter in book (Refereed)
    Abstract [en]

    Capability management has been the subject of a lot of research during the past years. Many of the results achieved have been presented in the previous chapters. Although the advancements have been substantial, a number of open issues and research questions remain. The chapter gives a summary on the ongoing research in the field and an outlook on future activities. More specifically, we discuss capability management for increasing cyber resilience, supporting digital transformation in organizations, managing big data, as well as carrying out continuous information system development.

  • 102618.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Svee, Eric-Oluf
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Giannoulis, Constantinos
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Capturing consumer preferences as requirements for software product lines2015In: Requirements Engineering, ISSN 0947-3602, E-ISSN 1432-010X, Vol. 20, no 1, p. 71-90Article in journal (Refereed)
    Abstract [en]

    Delivering great consumer experiences in competitive market conditions requires software vendors to move away from traditional modes of thinking to an outside- in perspective, one that shifts their business to becoming consumer-centric. Requirements engineers operating in these conditions thus need new means to both capture real preferences of consumers and then relate them to requirements for software customized in different ways to fit anyone. Additionally, because system development models require inputs that are more concrete than abstract, the indistinct values of consumers need to be classified and formalized. To address this challenge, this study aims to establish a conceptual link between preferences of consumers and system requirements, using software product line (SPL) as a means for systematically accommodating the variations within the preferences. The novelty of this study is a conceptual model of consumer preference, which integrates generic value frameworks from both psychology and marketing, and a method for its transformation to requirements for SPL using a goal-oriented RE framework as the mediator. The presented artifacts are grounded in an empirical study related to the development of a system for online education.

  • 102619.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Zikra, Iyad
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Ilayperuma, Tharaka
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    An MDA Method for Service Modeling by Formalizing REA and Open-edi Business Frameworks with SBVR2011Conference paper (Refereed)
    Abstract [en]

    Business frameworks offer great opportunities of communication between people for working on the enterprise system engineering processes, as well as for eliciting services that the enterprise can offer in collaboration contexts. However, these kinds of frameworks, such as Resource-Event-Agent and Open-edi, recently unified in Open-edi Business Ontology (OeBTO), lack formal representations. This fact considerably limits their use in system development, particularly in model-driven development methods where the efficiency of transformations is of great importance. In this paper we suggest a formalization of OeBTO using OMG’s standard Semantics of Business Vocabulary and Business Rules (SBVR), as a method for creating a service-centric business model. This makes it possible to provide the necessary formal logic foundation to allow automatic processing of the business model and its transformation to a system-level service model. An example from the bank loan business sector is used to argument the application of the method.

  • 102620. Zdravković, Milan
    et al.
    Zdravković, Jelena
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Aubry, Alexis
    Moalla, Néjib
    Guedria, Wided
    Sarraipa, João
    Domain framework for implementation of open IoT ecosystems2018In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 56, no 7, p. 2552-2569Article in journal (Refereed)
    Abstract [en]

    The current Internet-of-things (IoT) hype, pushed by the unprecedented rate of the technological enablers’ innovation, is threatening to leave behind some major, not so obvious, unresolved issues. IoT platforms will extend existing enterprise information systems (EIS) infrastructures to encompass cross-domain sensing and actuating capabilities, thus introducing additional complexity and major risks to the implementation. Furthermore, IoT platforms are typically driven by models of the trivial complexity; they support very simple data structures and almost no business logic implementation. Finally, IoT systems are today managed centrally, which often means less openness, less flexibility and greater change management costs. In this article, we provide the overview of the scientific disciplines which could contribute to the resolution of the IoT implementation problem, namely requirements engineering, change management/continuous improvement, model-based systems engineering, system architecture design, interoperability and policy and regulatory aspects. Then, we identify the challenges of these contributions in the context of IoT and finally make an attempt to identify research directions which could have a significant impact. The discussion of the challenges and opportunities is illustrated by the proposed domain framework for implementation of open IoT ecosystems.

  • 102621. Zdun, Agnieszka
    et al.
    Rozwadowska, Anna
    Kratzer, Susanne
    Stockholm University, Faculty of Science, Department of Systems Ecology.
    Seasonal variability in the optical properties of Baltic aerosols2011In: Oceanologia, ISSN 0078-3234, Vol. 53, no 1, p. 7-34Article in journal (Refereed)
    Abstract [en]

    A five-year dataset of spectral aerosol optical thickness was used to analyse the seasonal variability of aerosol optical properties (the aerosol optical thickness (AOT) at wavelength lambda = 500 urn, AOT(500) and the Angstrom exponent for the 440-870 urn spectral range, a(440, 870)) over the Baltic Sea and dependence of these optical properties on meteorological factors (wind direction, wind speed and relative humidity). The data from the Gotland station of the global radiometric network AERONET (Aerosol Robotic Network, http://aeronet.gsfc.nasa.gov)were taken to be representative of the Baltic Sea conditions. Meteorological observations from Farosund were also analysed. Analysis of the data from 1999 to 2003 revealed a strong seasonal cycle in AOT. (500) and alpha(440, 870). Two maxima, of monthly mean values of AOT(500) over the Baltic were observed. In April, an increase in the monthly mean aerosol optical thickness over Gotland most probably resulted from agricultural waste straw burning, mainly in northern Europe and Russia as well as in the Baltic states, Ukraine and Belarus. During July and August, the aerosol optical thickness was affected by uncontrolled fires (biomass burning). There was a local minimum of AOT(500) in June. Wind direction, a local meteorological parameter strongly related to air mass advection, is the main meteorological factor influencing the variability of aerosol optical properties in each season. The highest mean values of AOT(500) and alpha(440, 870) occurred with easterly winds in both spring and summer, but with southerly winds in autumn.

  • 102622. Zdun, Agnieszka
    et al.
    Rozwadowska, Anna
    Kratzer, Susanne
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    The impact of air mass advection on aerosol optical properties over Gotland (Baltic Sea)2016In: Atmospheric research, ISSN 0169-8095, E-ISSN 1873-2895, Vol. 182, p. 142-155Article in journal (Refereed)
    Abstract [en]

    In the present paper, measurements of aerosol optical properties from the Gotland station of the AERONET network, combined with a two-stage cluster analysis of back trajectories of air masses moving over Gotland, were used to identify the main paths of air mass advection to the Baltic Sea and to relate them to aerosol optical properties, i.e. the aerosol optical thickness at the wavelength lambda = 500 nm, AOT (500) and the Angstrom exponent for the spectral range from 440 to 870 nm, alpha(440,870). One-to six-day long back trajectories ending at 300, 500 and 3000 m above the station were computed using the HYSPLIT model. The study shows that in the Gotland region, variability in aerosol optical thickness AOT(500) is more strongly related to advections in the boundary layer than to those in the free troposphere. The observed variability in AOT(500) was best explained by the advection speeds and directions given by clustering of 4-day backward trajectories of air arriving in the boundary layer at 500 m above the station. 17 clusters of 4-day trajectories arriving at altitude 500 m above the Gotland station (sea level) derived using two-stage cluster analysis differ from each other with respect to trajectory length, the speed of air mass movement and the direction of advection. They also show different cluster means of AOT(500) and alpha(440,870). The cluster mean AOT(500) ranges from 0342 +/- 0.012 for the continental clusters M2 (east-southeast advection with moderate speed) and 0294 +/- 0.025 for S5 (slow south-southeast advection) to 0.064 +/- 0.002 and 0.069 +/- 0.002 for the respective marine clusters L3 (fast west-northwest advection) and M3 (north-northwest advection with moderate speed). The cluster mean a(440,870) varies from 1.65-1.70 for the short-trajectory clusters to 0.98 +/- 0.03 and 1.06 +/- 0.03 for the Arctic marine cluster L4 (fast inflow from the north) and marine cluster L5 (fast inflow from the west) respectively.

  • 102623.
    Zdyb, Anna Maria
    Stockholm University, Faculty of Science, Department of Botany.
    Jasmonates in root nodule development2008Doctoral thesis, monograph (Other academic)
    Abstract [en]

    Jasmonic acid (JA), its derivatives and its precursor form a group of phytohormones, the jasmonates, representing signal molecules involved in plant stress responses, in the defense against pathogens as well as in development. Elevated levels of JA have been shown to play a role in arbuscular mycorrhiza and in the induction of nitrogen-fixing root nodules.

    JA levels were analysed in roots and nodules of four different symbioses: two model legumes, Medicago truncatula and Lotus japonicus, and two actinorhizal species, Casuarina glauca and Datisca glomerata. JA levels in roots, nodules and leaves of all four plant species increased upon mechanical disturbance and wounding, thus any results on nodule JA levels were unreliable due to the harvesting procedure. Immunolocalization of two enzymes from JA biosynthes, lipoxygenase (LOX) and allene oxide cyclase (AOC), in nodules indicated the first intermediate in the pathway, 13-HPOT is produced by cytosolic LOXes and shuttled to the plastids.

    Detailed analyses of JA levels were performed for L. japonicus cultivated aeroponically. Levels were more or less stable over five weeks during nodulation or growth on nitrate or ammonium. However, L. japonicus nodules formed on aeroponically grown plants often showed patches of cells with reduced bacteroid density, presumably a stress symptom. These nodules seemed to contain less AOC protein than nodules of plants grown in perlite/vermiculite. Hence, aeroponically grown plants may have been habituated to stress which would have affected JA levels.

    The gene families of two enzymes of the JA biosynthetic pathway were characterized in L. japonicus, allene oxide synthase (AOS) and AOC. Transgenic plants carrying RNAi constructs for aos and for the aoc gene expressed in nodules, aoc1, were constructed. Preliminary results on F1 plants of different aoc1 RNAi lines indicated that a reduction in aoc1 transcript levels did not affect nodule induction or nitrogen fixation to a significant extent.

  • 102624.
    Zdyb, Anna
    et al.
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences. Georg-August-University, Germany.
    Salgado, Marco G.
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Demchenko, Kirill N.
    Brenner, Wolfram G.
    Plaszczyca, Malgorzata
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Stumpe, Michael
    Herrfurth, Cornelia
    Feussner, Ivo
    Pawlowski, Katharina
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences. Georg-August-University, Germany.
    Allene oxide synthase, allene oxide cyclase and jasmonic acid levels in Lotus japonicus nodules2018In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 13, no 1, article id e0190884Article in journal (Refereed)
    Abstract [en]

    Jasmonic acid (JA), its derivatives and its precursor cis-12-oxo phytodienoic acid (OPDA) form a group of phytohormones, the jasmonates, representing signal molecules involved in plant stress responses, in the defense against pathogens as well as in development. Elevated levels of JA have been shown to play a role in arbuscular mycorrhiza and in the induction of nitrogen-fixing root nodules. In this study, the gene families of two committed enzymes of the JA biosynthetic pathway, allene oxide synthase (AOS) and allene oxide cyclase (AOC), were characterized in the determinate nodule-forming model legume Lotus japonicus JA levels were to be analysed in the course of nodulation. Since in all L. japonicus organs examined, JA levels increased upon mechanical disturbance and wounding, an aeroponic culture system was established to allow for a quick harvest, followed by the analysis of JA levels in whole root and shoot systems. Nodulated plants were compared with non-nodulated plants grown on nitrate or ammonium as N source, respectively, over a five week-period. JA levels turned out to be more or less stable independently of the growth conditions. However, L. japonicus nodules formed on aeroponically grown plants often showed patches of cells with reduced bacteroid density, presumably a stress symptom. Immunolocalization using a heterologous antibody showed that the vascular systems of these nodules also seemed to contain less AOC protein than those of nodules of plants grown in perlite/vermiculite. Hence, aeroponically grown L. japonicus plants are likely to be habituated to stress which could have affected JA levels.

  • 102625.
    Zebühr, Yngve
    Stockholm University, Faculty of Science, Department of Analytical Chemistry.
    Trace analysis of polychlorinated dibenzo-p-dioxines, dibenzofurans and related compounds in environmental matrices1992Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    In this thesis sample extraction, clean up procedures and quantitative and qualitative analysis of polychlorinated dibenzo-p-dioxins, dibenzofurans and related compounds are discussed, as well as aspects on the sampling of some complex environmental matrices.

    The matrices are mostly from the aquatic environment but other samples are also dealt with, such as urban and remote air samples, samples from environments with heavy automobile traffic and samples from one municipal incinerator, waste water treatment plants etc.

    The samples from the aquatic environment represent both heavily contaminated matrices such as settling particulate matter from areas off various industries and in central Stockholm, and complex biological matrices such as bivalves, fish and birds.

    The thesis describes the different steps of the cleaning up procedure in detail. New automated methods for handling complicated samples are further discussed. A new method which was used for most of the samples prepares all the fractions for analysis on high resolution GC, medium resolution MS and GC-mass selective detector.

    Another central part of the work in this thesis is the aim to analyse as many as possible of the components of interest in the same sample. This gives more precise answers to the questions asked, reduces the number of samples and last but not least, saves time. The essence of this method is a HPLC-method which uses an amino column for fractionation of the sample according to the aromaticity, in combination with a GCP-column which has high selectivity for aromatic and related compounds. The fractions are collected both using a heart-cutting mode and a back-flushing technique.

  • 102626.
    Zech, Lore
    Stockholm University.
    Growth and nuclear differentiation in some protozoa: with special reference to nucleic acid and protein synthesis1967Book (Other academic)
  • 102627.
    Zedek, Rfet Alla Ali
    Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
    Geostatistical analysis of the Gorran water protection area in Nynäshamn municipality2014Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
    Abstract [en]

    Groundwater level models have an important role in the development and application of water management and policies. Understanding the temporal and spatial variations of groundwater levels in the Gorran water protection area in Nynäshamn is important for developing management strategies. Geostatistical analysis with several different methods was used to compare groundwater level records for 13 observation wells in Gorran from 1994 to 2012. The performance of the different methods was evaluated by using mean absolute error (MAE) and root mean square error (RMSE) metrics. The results showed that geostatistical methods had a higher general accuracy when utilizing the Empirical Bayesian kriging (EBK) method in Gorran. EBK was the best method with highest precision and lowest mean absolute error. Cross-validation was also applied to evaluate the best (smallest) root mean square error (RMSE). A predicted potentiometric groundwater level was estimated from the basis of the available digital elevation model to extend the observation area within the same geological specification.

  • 102628.
    Zedenius, Fanny
    Stockholm University, Faculty of Social Sciences, Department of Economic History.
    Ideologi och människosyn på export: En undersökning av de ideologiska och teoretiska grunderna i IMF:s strukturanpassningsprogram - Ghanas och Etiopiens erfarenheter2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    IMF:s lån till utvecklingsländer på 1980- och 90-talet kom med krav på strukturanpassningsprogram (SAPs), vilket innebar stort inflytande över utvecklingsländernas ekonomier. För många länder försämrades det ekonomiska läget, skulderna ökade och sociala förhållanden förvärrades. Bakom dessa strategier låg neoliberala idéer och neoklassisk ekonomisk teori. Den neoklassiska ekonomiska teorin kritiseras ofta av feministiska ekonomer för att innehålla en felaktig människosyn inom modellen om människors ekonomiska beteende: ’economic man’. Enligt dem leder ’economic man’ som människosyn till konsekvenser i den politiska praktiken då den neoklassiska ekonomiska teorin influerar beslutsfattande. Denna uppsats undersöker hur neoliberalismen och människosynen bakom ’economic man’ har influerat policydokumenten om SAPs. Uppsatsen utgår från de feministiska ekonomernas kritik mot neoklassisk ekonomisk teori och ’economic man’, samt Philip Mirowskis diskussioner om neoliberalism. Studien genomförs utifrån två fallstudier om SAPs, i Ghana (1987-2001) och i Etiopien (1992-2001), baserat på de dokument som innehåller de politiska omstruktureringarna som IMF anser nödvändiga och länderna avser genomföra för att få tillgång till IMF:s lån. Undersökningen visar att de neoliberala idéerna figurerar både explicit och implicit i utformandet av SAPs och påverkar utformandet av dem då de utgår från neoliberalsmens övertygelser om bästa sättet att nå tillväxt och önskad utveckling. Vidare indikerar resultatet att människosynen bakom ’economic man’, framförallt vad gäller antagandena om rationalitet och nyttomaximering, förekommer som en logisk premiss i utvecklingsstrategierna och därmed har influerat utformningen SAPs. Dessutom framgår det att makroperspektivet i dokumenten bidrar till att reproducera maktrelationer och strukturella hierarkier som missgynnar kvinnor.

  • 102629.
    Zeghbi, Paula
    et al.
    Stockholm University, Faculty of Social Sciences, School of Business.
    Kasagianni, Christina
    Stockholm University, Faculty of Social Sciences, School of Business.
    Balanced Scorecard: En studie om delaktighet och engagemang i styrkortsarbetet på operativ nivå2002Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Traditionella metoder för att styra företag och organisationer har under de senaste decennierna fått kritik för att vara alltför kortsiktiga och för att ge bristfälliga underlag vid beslutsfattande. Denna kritik har gett upphov till flera nya koncept, som ger företagen möjlighet att frångå den traditionella ekonomistyrningen. En av dessa koncept är The Balanced Scorecard, vars syfte är att fungera som ett hjälpmedel för att på ett effektivt sätt styra och utveckla företagets rörelse mot dess mål och vision, genom att titta på företaget ur både finansiella och icke-finansiella perspektiv. På så sätt skapas en balans mellan finansiella och icke-finansiella mått. The Balanced Scorecard formulerar och synliggör företagets vision, affärsidé och mål i syfte att visa hur företagets olika delar samverkar och påverkar varandra. För att arbetet med det balanserade styrkortet ska ge positiva effekter, måste det förutom enighet och engagemang på ledningsnivå, förekomma delaktighet och förståelse för styrkortet hos de övriga i företaget. För att ett företag ska lyckas uppnå sin vision, måste både visionen och strategin förmedlas till alla medarbetare i företaget, för att dessa ska kunna jobba mot samma mål. Enligt en svensk undersökning är det få medarbetare som känner till företagets strategiska mål: ”Visionen översätts inte till operativa termer som ger handledning till verksamheten på lägre nivå”.

  • 102630.
    Zeghbi, Paula
    et al.
    Stockholm University, Faculty of Social Sciences, School of Business.
    Kasagianni, Christina
    Stockholm University, Faculty of Social Sciences, School of Business.
    Handelsbankens belöningssystem: För individen och kollektivet2003Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Företagsledningens främsta uppgift är att styra företaget effektivt för att uppnå de av ägarna uppställda målen. För att säkerställa verksamhetens effektivitet används olika styrmedel. Förutom strategier, planer och strukturer för organisationen används även belöningssystem, vars syfte är att skapa rätt motivation hos medarbetarna. Genom att dela ut belöningar visar företagsledningen vilka slags beteenden som är önskvärda inom organisationen och på vilket sätt de anställda ska arbeta för att uppnå de resultat som i sin tur leder till belöning.

  • 102631. Zeiler, K.
    et al.
    Furberg, Eisabeth
    Stockholm University, Faculty of Humanities, Department of Philosophy.
    Tufveson, G.
    Welin, S.
    The ethics of non-heart-beating donation: how new technology can change the ethical landscape2008In: Journal of Medical Ethics, ISSN 0306-6800, E-ISSN 1473-4257, Vol. 34, no 7, p. 526-529Article in journal (Refereed)
    Abstract [en]

    The global shortage of organs for transplantation and the development of new and better medical technologies for organ preservation have resulted in a renewed interest in non-heart-beating donation (NHBD). This article discusses ethical questions related to controlled and uncontrolled NHBD. It argues that certain preparative measures, such as giving anticoagulants, should be acceptable before patients are dead, but when they have passed a point where further curative treatment is futile, they are in the process of dying and they are unconscious. Furthermore, the article discusses consequences of technological developments based on improvement of a chest compression apparatus used today to make mechanical heart resuscitation. Such technological development can be used to transform cases of non-controlled NHBD to controlled NHBD. In our view, this is a step forward since the ethical difficulties related to controlled NHBD are easier to solve than those related to non-controlled NHBD. However, such technological developments also evoke other ethical questions.

  • 102632.
    Zeilich-Jensen, Leif
    Stockholm University, Faculty of Humanities.
    Den centraleskimåiska världsbilden: huvuddragen av eskimåisk religion mot bakgrunden av termerna för orientering1974Doctoral thesis, monograph (Other academic)
  • 102633. Zeilinger, Michael
    et al.
    Baran, Volodymyr
    van Wuellen, Leo
    Häussermann, Ulrich
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Faessler, Thomas F.
    Stabilizing the Phase Li15Si4 through Lithium-Aluminum Substitution in Li15-xAlxSi4 (0.4 <= x <= 0.8)-Single Crystal X-ray Structure Determination of Li15Si4 and Li14.37Al0.63Si42013In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 25, no 20, p. 4113-4121Article in journal (Refereed)
    Abstract [en]

    Single crystals of Li15Si4 and Li15-xAlxSi4 (x = 0.63(1)) were obtained from equilibrated melts with compositions Li100-xSix (x = 10, 15) and Li83Al13Si4, respectively, and isolated by isothermal centrifugation. Li15Si4 and Li14.37(1)Al0.63(1)Si4 crystallize with the Cu15Si4 structure type (I (4) over bar 3d, a(x=0) = 10.6322(9) angstrom, a(x=0.63(1)) = 10.6172(4) angstrom, Z = 4, T = 123 K). The incorporation of Al equally affects both crystallographically distinguished Li positions in the Li15Si4 structure. The replacement of about 4% of Li is firmly established by the refinement of single crystal diffraction data and NMR spectroscopy. The homogeneity range of Li15-xAlxSi4 was assessed as 0.4 < x < 0.8 from synthesis experiments using stoichiometric proportions of the elements. Differential scanning calorimetry studies confirm the metastable character of Li15Si4, decomposing exothermally at temperatures around 200 degrees C. However, the decomposition process of Li15Si4, is sluggish and appreciable rates are not observed before temperatures reach 400 degrees C. In contrast Li15-xAlxSi4 is thermodynamically stable. The decomposition temperature is at about 700 degrees C. It is speculated that the thermodynamic stability of Li15-xAlxSi4 is a consequence of the increased electron concentration, shifting the Fermi level to a pseudo-gap in the electronic density of states. Since metastable Li15Si4 plays an important role during electrochemical lithiation of a silicon anode, thermodynamically stable Li15-xAlxSi4 may have interesting properties as anode material in lithium ion batteries.

  • 102634. Zeilinger, Michael
    et al.
    Benson, Daryn
    Haussermann, Ulrich
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Faessler, Thomas F.
    Single Crystal Growth and Thermodynamic Stability of Li17Si42013In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 25, no 9, p. 1960-1967Article in journal (Refereed)
    Abstract [en]

    Single crystals of Li17Si4 were synthesized from melts LixSi100-x (x > 85) at various temperatures and isolated by isothermal centrifugation. Li17Si4 crystallizes in the space group F (4) over bar 3m (a = 18.7259(1) angstrom, Z = 20). The highly air and moisture sensitive compound is isotypic with Li17Si4. represents a new compound and thus the lithium-richest phase in the binary system Li-Si superseding known Li21Si5 (Li16.8Si4). As previously shown Li22Si5 (Li17.6Si4) has been determined incorrectly. The findings are supported by theoretical calculations of the electronic structure, total energies, and structural optimizations using first-principles methods. Results from melt equilibration experiments and differential scanning calorimetry investigations suggest that Li17Si4 decomposes peritectically at 481 +/- 2 degrees C to Li4Si and melt. In addition a detailed investigation of the Li-Si phase system at the Li rich side by thermal analysis using differential scanning calorimetry is given.

  • 102635. Zeilinger, Michael
    et al.
    Jantke, Laura-Alice
    Scherf, Lavinia M.
    Kiefer, Florian J.
    Neubueser, Gero
    Kienle, Lorenz
    Karttunen, Antti J.
    Konar, Sumit
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Häussermann, Ulrich
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Faessler, Thomas F.
    Alkali Metals Extraction Reactions with the Silicides Li15Si4 and Li3NaSi6: Amorphous Si versus allo-Si2014In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 26, no 22, p. 6603-6612Article in journal (Refereed)
    Abstract [en]

    The silicides Li15Si4 and Li3NaSi6 were subjected to chemical extraction of the alkali metal component by liquid ammonia and ethanol, respectively, which after washing yielded black powders of amorphous silicon. The investigated reactions are interesting with respect to both the formation of novel Si modifications and the delithiation process in Si anode materials. The products termed a-Si (from Li15Si4) and a-allo-Si (from Li3NaSi6) were characterized by a combination of methodologies (X-ray diffraction, transmission electron microscopy, differential thermal analysis, Raman, atomic absorption, and energy-dispersive X-ray spectroscopy) which revealed (i) a porous microstructure for a-Si built from spherically shaped particles with sizes around 10 nm, (ii) partial surface oxidation of both materials and (iii) the presence of nanocrystalline Si in both materials. The result of the protic oxidation of Li3NaSi6 is at variance with earlier findings reporting the formation of a crystalline bulk allotrope of silicon (allo-Si) from the topotactic combination of silicon layers present as polyanions in Li3NaSi6. Additionally, quantum chemical calculations show that silicon layers in Li3NaSi6 cannot combine to energetically favorable allotropic forms of Si. This is different from Li7Ge12, where polyanionic germanium layers topotactically convert to the germanium allotrope m-allo-Ge upon oxidation.

  • 102636. Zeilinger, Michael
    et al.
    Kurylyshyn, Iryna M.
    Häussermann, Ulrich
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Faessler, Thomas F.
    Revision of the Li-Si Phase Diagram: Discovery and Single-Crystal X-ray Structure Determination of the High-Temperature Phase Li4.11Si2013In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 25, no 22, p. 4623-4632Article in journal (Refereed)
    Abstract [en]

    Silicon has been regarded as a promising anode material for future lithium-ion batteries, and Li-Si phases play an important role. A detailed reinvestigation of the Li-rich part of the binary Li-Si phase diagram revealed the existence of a new phase, Li4.106(2)Si (Li16.42Si4). Li16.42Si4 forms through the peritectic decomposition of the Li-richest phase Li17Si4 at 481-486 degrees C and was characterized by single-crystal X-ray diffraction (a = 4.5246(2) angstrom, b = 21.944(1) angstrom, c = 13.2001(6) angstrom, space group Cmcm, Z = 16), differential scanning calorimetry, and theoretical calculations. Li16.42Si4 represents a high-temperature phase that is thermodynamically stable above similar to 480 degrees C and decomposes peritectically at 618 +/- 2 degrees C to Li13Si4 and a melt. Li16.42Si4 can be retained at room temperature. The structure consists of 3 and 10 different kinds of Si and Li atoms, respectively. Two Li positions show occupational disorder. Si atoms are well-separated from each other and have only Li atoms as nearest neighbors. This is similar to Li17Si4 and Li15Si4 compositionally embracing Li16.42Si4. The SiLin coordination polyhedra in the series Li15Si4, Li16.42Si4, and Li17Si4 are compared. Li15Si4 exclusively features coordination numbers of 12, Li16.42Si4 of 12 and 13, and Li17Si4 reveals 13- and 14-coordinated Si atoms. The band structure and density of states of Li16.42Si4 were calculated on the basis of two ordered model structures with nominal compositions Li16Si4 (a hypothetical Zintl phase) and Li16.5Si4. Both reveal a metallic character that is analogous to Li17Si4. In contrast, the electronic structure of Li15Si4 is characteristic of a p-doped semiconductor.

  • 102637. Zeilinger, Michael
    et al.
    van Wüllen, Leo
    Benson, Daryn
    Kranak, Verina F.
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Konar, Sumit
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Fässler, Thomas F.
    Häussermann, Ulrich
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    LiBSi2: A Tetrahedral Semiconductor Framework from Boron and Silicon Atoms Bearing Lithium Atoms in the Channels2013In: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 52, no 23, p. 5978-5982Article in journal (Refereed)
  • 102638.
    Zeilon, Nils
    Stockholm College.
    Sur les intégrales fondamentales des équations à caractéristique réelle de la physique mathématique1914Doctoral thesis, monograph (Other academic)
  • 102639.
    Zeinali, Arash
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Golod, Taras
    Stockholm University, Faculty of Science, Department of Physics.
    Krasnov, Vladimir M.
    Stockholm University, Faculty of Science, Department of Physics.
    Surface superconductivity as the primary cause of broadening of superconducting transition in Nb films at high magnetic fields2016In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 94, no 21, article id 214506Article in journal (Refereed)
    Abstract [en]

    We study the origin of broadening of superconducting transition in sputtered Nb films at high magnetic fields. From simultaneous tunneling and transport measurements we conclude that the upper critical field H-c2 always corresponds to the bottom of transition R similar to 0, while the top R similar to R-n occurs close to the critical field for destruction of surface superconductivity H-c3 similar or equal to 1.7H(c2). The two-dimensional nature of superconductivity at H > H-c2 is confirmed by cusplike angular dependence of magnetoresistance. Our data indicates that surface superconductivity is remarkably robust even in disordered polycrystalline films and, surprisingly, even in perpendicular magnetic fields. We conclude that surface superconductivity, rather than flux-flow phenomenon, inhomogeneity, or superconducting fluctuations, is the primary cause of broadening of superconducting transition in magnetic field.

  • 102640.
    Zeinali, Sheila
    et al.
    Stockholm University, Faculty of Social Sciences, School of Business.
    Hagenstam, Pernilla
    Stockholm University, Faculty of Social Sciences, School of Business.
    Utveckling av försäljningskanaler inom IT-branschen: En explorativ undersökning med fokus på mobiltelefoner och datorer då utvecklingen inom IT-branschen leder till produktintegration2000Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Utvecklingen inom IT-branschen ger oss ständigt nya produkter med nya funktioner. Mobiltelefoner utvecklas från att vara en telefon till något mycket mer. Genom dessa mer tekniskt avancerade produkter ska företag kunna öka sin effektivitet genom att utöka kommunikationen mellan medarbetarna från enbart röstöverföring till dataöverföring. Detta kan vara av stor betydelse då människor blir alltmer rörliga i sina yrken och samtidigt måste vara nåbara.

  • 102641.
    Zeinali, Sheila
    et al.
    Stockholm University, Faculty of Social Sciences, School of Business.
    Hendil-Forssell, Björn
    Stockholm University, Faculty of Social Sciences, School of Business.
    Affärsförbindelser mellan företag inom fordonsindustrin: En explorativ undersökning med inriktning på fordonstillverkare och leverantörer2001Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Sammanfattning saknas.

  • 102642.
    Zeising, Tove
    Stockholm University, Faculty of Social Sciences, Department of Child and Youth Studies.
    Samling i förskolan: En studie om förskolebarns möjlighet till inflytande och delaktighet i samlingen2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med studien är att undersöka vilka möjligheter till inflytande och delaktighet barnen har i samlingen i förskolan och vad det är i pedagogens agerande som möjliggör respektive förhindrar delaktighet och inflytande. Studien är kvalitativ och genomfördes på två förskolor i västra Stockholm genom både observationer av verksamheten och intervjuer med två förskollärare. Fokus har legat på observationerna och intervjuerna har varit ett komplement för att öka förståelsen för pedagogernas tankar, planering och synpunkter. Jag har skrivit en bakgrund med definition av begreppen samling, delaktighet och inflytande samt en modell för inflytande och delaktighet. I teoribakgrunden presenteras tidigare forskning och den socialkonstruktionistiska teorin som ligger till grund för studien. Resultaten presenteras skiljt fån analysen för att ge läsaren möjlighet till egna tolkningar och består av material från observationer och intervjuer. Resultaten analyseras utifrån valda begrepp och teorier och diskuteras avslutningsvis.

    Studiens resultat visade att barnens möjligheter till inflytande och delaktighet i förskolornas samlingar står i stark beroendeställning till pedagogernas förhållningssätt och vilja att närma sig barnens perspektiv. Pedagogerna i studien utgår från en barnsyn då de ser barn som medmänniskor men resultaten från observationerna visar att deras planering av och agerande under några av samlingarna mer kan liknas vid barnsynen vuxna vet bättre. Det blev tydligt att det var när pedagogerna hade kontroll över samlingen genom att lyssna på barnen, gjorde försök att närma sig deras perspektiv och bjöd in barnen i samtal genom att ställa nyfikna frågor, som samtalen utvecklades och barnen fick inflytande och möjlighet att påverka innehållet i samlingen. Detta skedde inte under alla samlingar och det fanns tillfällen då den färdiga planeringen för samlingen fick styra allt för mycket. Istället för att fånga barnens tankar och försöka förstå deras intentionervalde pedagogerna att fortsätta med de förutbestämda momenten i samlingen. Pedagogerna tog då kontroll över samlingen genom att bestämma vem som fick prata och om vad de skulle prata om, vilket begränsade barnens möjligheter till inflytande och delaktighet. 

  • 102643.
    Zejan, Irene
    et al.
    Stockholm University, Faculty of Social Sciences, School of Business.
    Diriye, Fadumo
    Stockholm University, Faculty of Social Sciences, School of Business.
    Snålhet, Stress, Självuppfyllelse eller Status - vad driver studenten i köpsituationen?: En fallstudie om studenters köpbeteende vid konsumtion av kurslitteratur2004Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Vi har genomfört en studie om studenters konsumtion av kurslitteratur och tittat på vilka faktorer som avgör valet av införskaffningskanal. Med utgångspunkt i studenters pressade ekonomiska situation kan man tänka sig att de flesta studenter torde välja de billigaste införskaffningsalternativen. En studie gjord vid Uppsala universitet visar dock att studenter väljer att köpa sin kurslitteratur istället för att skaffa den genom andra kanaler, såsom kopiering och lån. Detta beteende fick oss att vilja studera varför studenter, trots sin ansträngda ekonomi, väljer att köpa sin litteratur trots att det finns billigare sätt att skaffa den på.

  • 102644.
    Zekarias, Eden
    Stockholm University, Faculty of Social Sciences, Department of Sociology.
    Hur andra generationen invandrare upplever integration2013Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
  • 102645.
    Zelada, Sebastian
    et al.
    Stockholm University, Faculty of Social Sciences, School of Business.
    Jonegård, Frida
    Stockholm University, Faculty of Social Sciences, School of Business.
    Kvalitetskontroller inom revision: Vågar vi lita på kvalitetskontrollerna?2005Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Med anledning av de senaste årens redovisningsskandaler kom nya EU-direktiv i slutet av år 2000, vilket innebär att samtliga personer som utför lagstadgad revision ska omfattas av ett kvalitetssäkringssystem. I november år 2003 ingick därför Revisorsnämnden (RN), FAR och SRS ett kvalitetssäkringsavtal, i vilket RN gav branschorganisationerna i uppdrag att utföra kvalitetskontrollerna på myndighetens begäran. Frågan är om det bland dessa finns revisorer som godkänner fel och oegentligheter. Om så är fallet, upptäcks de i kvalitetskontrollerna som FAR och SRS genomför? Vågar vi lita på kvalitetskontrollerna?

  • 102646. Zelan, M.
    et al.
    Hagman, H.
    Labaigt, G.
    Jonsell, Svante
    Stockholm University, Faculty of Science, Department of Physics.
    Dion, C. M.
    Experimental measurement of efficiency and transport coherence of a cold-atom Brownian motor in optical lattices2011In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, E-ISSN 1550-2376, Vol. 83, no 2, p. 020102-Article in journal (Refereed)
    Abstract [en]

    The rectification of noise into directed movement or useful energy is utilized by many different systems. The peculiar nature of the energy source and conceptual differences between such Brownian motor systems makes a characterization of the performance far from straightforward. In this work, where the Brownian motor consists of atoms interacting with dissipative optical lattices, we adopt existing theory and present experimental measurements for both the efficiency and the transport coherence. We achieve up to 0.3% for the efficiency and 0.01 for the Peclet number.

  • 102647.
    zeller tiilikainen, ylva
    Stockholm University, Faculty of Social Sciences, Department of Special Education.
    En skolas organisering av arbetssättet med elevers olikheter2012Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    En skolas organisering anses idag vara viktigare än organisationen, det är i handlingsnäten i organiseringen som organisationen byggs. Organisering av en skolas arbetssätt har samband med pedagogers möjligheter att arbeta med elevers olikheter. Samarbete blir betydelsefullt. Gemensamma visioner och mål får betydelse för samarbetet. För pedagogerna underlättas arbetet om samarbete organiseras in i verksamheten och vision och mål är tydliga. Forskning visar på skolor som är framgångsrika. I skolorna har mål, samarbete och positivt klimat samband med elevernas resultat. I en inkluderad undervisningsmiljö bör dessa faktorer vara tillgodosedda.

    Studien är en etnografisk studie som pågått genom olika fältstudier i utbildningen till specialpedagog. Syftet med studien är att se hur organisering sker av arbetssättet i en skola som ger uttryck för att utgå från elevers olikheter. Skolan är en högstadiefriskola och arbetar målmedvetet med elevernas olikheter. Analysen i studien har utgått från organisationsteori, socialpsykologisk teori, symbolisk interaktionism, teorier om roller och gruppdynamik, framgångsrika skolor, handlingsteori och pedagogiska synsätt. Resultatet visar att organiseringen av skolans arbetssätt leder till en formell organisering som är uppgiftsorienterad och en informell organisering som är relationsorienterad. I den formella organiseringen finns skolans vision och pedagogiska synsätt som bas till den struktur som innehåller ett tydligt arbetssätt, delaktighet, är flexibelt efter elevers olikheter och har fokus på kunskap. Den formella organiseringen har konkreta verktyg/artefakter som stöd i organiseringen, loggbok och handledande samtal. Den informella organiseringen uttrycker de relationer som den formella organiseringen grundlägger. Elever och lärare möts genom kunskapandet, blir synliggjorda, möts i samspel, respekt, ansvar, krav och empowerment. Den formella och den informella organiseringen leder till att lärare och elever får systemiska roller. Centralt blir samspel och kommunikation mellan alla aktörer. Arbetssättets organisering för att möta elevers olikheter bygger på medveten pedagogik och ansvarstagande från lärare. Lärares handledande samtal med eleven femton minuter varje vecka är centralt på skolan. Elever uttrycker lärares vägledning som betydelsefull. Vägledningen blir komplex då elever uttrycker både ett beroende av lärares vägledning men också att den leder till autonomi. Genom att organisering av arbetssättet utgår från elevers olikheter leder olikheter inte till svårigheter i undervisningen. Skolans fokus ligger på kunskapandet och skolarbetet blir uppgiftsfokuserat. Det leder till att samarbetet mellan lärare och elever blir en relation. Skolans fokus på kunskapandet blir även en norm på skolan. I studien gjordes en kartläggning av den formella och informella organiseringen för att kritiskt granska och förstå hur en verksamhet bäst tillgodoser elevers olikheter i lärandet genom samarbete och positivt klimat.

  • 102648.
    zeller tiilikainen, ylva
    Stockholm University, Faculty of Social Sciences. Stockholm University, Faculty of Social Sciences, Department of Special Education.
    En studie i pedagogers syn på sambandet mellan fortbildning och skolutveckling i grundskolan: fortbildning-skolutveckling-implementering2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med denna studie är att undersöka pedagogers uppfattningar om sambandet mellan fortbildning och skolutveckling i grundskolans år F-5. Vad har pedagogerna för uppfattningar om organisationen av fortbildningen? Hur uppfattar de att skolledningen planerar in reflektionstid efter fortbildningen? Pedagogens egen uppfattning om fortbildningen, hur ser den ut? Upplever pedagogerna att deras fortbildning implementeras i verksamheten och bidrar till skolutveckling? Känner pedagogerna till kommunens skolutvecklingsprojekt Våga Visa? Studien är en enkätstudie. Enkäten är utformad som en strukturerad enkät med en öppen fråga där pedagogen fick ge sin egen syn på fortbildning. Det är 41 pedagoger från fyra grundskolor i en kommun som har svarat på enkäten. Resultatet visade att pedagogerna inte hade någon gemensam uppfattning om vem det är som organiserar och planerar deras fortbildning. De hade dessutom en bristfällig uppfattning om skolan hade någon strategi för fortbildningen. Pedagogerna i studien har olika syn på fortbildningen. En tredjedel menar att den enbart leder till kompetensutveckling. Hälften av pedagogerna tror inte att den leder till skolutveckling. Studien bekräftar tidigare studier som visar att pedagogerna är mycket intresserade och blir inspirerade av fortbildningen. I enkätstudiens fria fråga är det flera pedagoger som efterfrågar fortbildning som utgår från deras egna behov. Flera pedagoger menar att fortbildningen ska vara genomtänkt. Pedagogerna i studien har en osäker uppfattning om fortbildningen leder till ett gemensamt förhållningssätt eller om den förändrar pedagogens arbetssätt. Studien visade att fortbildningen diskuterades och reflekterades sällan efteråt. Majoriteten menade att man bara diskuterat fortbildningen ”någon gång” efter ett fortbildningstillfälle eller på en arbetsplatsträff trots att de flera gånger velat få reflektionstid efter ett fortbildningstillfälle. I studien är en stor majoritet intresserade av begreppet skolutveckling. Hälften av pedagogerna i studien kände inte till projektet Våga Visa som styr en stor del av kommunens mål för skolutveckling. Begreppet skolutveckling är ett stort och subjektivt begrepp som innehåller många delar bl.a. implementering. Skolutveckling handlar om så mycket mer än om pedagogernas fortbildning och kompetens. Alla i kedjan, från skolledning i kommunhus ner till pedagoger, har en roll i skolutvecklingen. Den största delen av skolutvecklingen ligger i skolans egen kultur. Det är i samspelet med kollegor och i systematisk reflektion av frågor och ifrågasättande som skolutveckling sker. En skolas kultur uppstår i samarbetet mellan rektor, pedagoger, elever och föräldrar. Den kulturen är det viktigt att få stöd för från skolledningen i kommunen. Ju bättre samarbete i alla led desto bättre skolkultur och skolutveckling.

    Nyckelord: Fortbildning, skolutveckling och implementering.

     

  • 102649.
    Zeller Tiilikainen, Ylva
    Stockholm University, Faculty of Social Sciences, Department of Education.
    Lärares möjligheter och svårigheter att utforma gemensamma värderingar2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The purpose of the study is to examine what enables and makes it difficult for teachers to create common values ​​in a school. The study is a case study of a school in Kunskapsskolan Education Sweden (KED). The organization has common values as a goal with the purpose to be a tool for teachers in the work, and to create an organizational culture. The empirical material consists of interviews and observations. The result shows that the school's operation and structure provides support for teachers' collaboration and it will be fundamental to the ability to create consensus about the school's goals. The organization, cooperation and a common goal is expressed as a key condition for the possibility of developing common values. The teachers are aware of the organization's formal goals and values, but the most important is the informal values ​​created through the collaboration in teams and by common perceptions of the target in the work. The pedagogical approach in the school also affects to the common values expressed in the school's culture. Organization and cooperation on goal must have the potential to become a common system of thought in the school's inner workings if they are to be shared values. They then expressed in the school's culture and in everyday work and contribute to school activities is perceived as a shared responsibility.

  • 102650. Zelli, Fariborz
    et al.
    Gupta, Aarti
    van Asselt, Harro
    Stockholm University, Stockholm Resilience Centre, Stockholm Environment Institute.
    Horizontal institutional interlinkages2012In: Global environmental governance reconsidered / [ed] Frank Biermann and Philipp Pattberg, Cambridge, Mass.: MIT Press, 2012, p. 175-198Chapter in book (Other academic)
2050205120522053205420552056 102601 - 102650 of 105518
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf