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Search Results: 1 - 10 of 5074 matches for " Brita Jung "
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Exit times for multivariate autoregressive processes
Brita Jung
Mathematics , 2012,
Abstract: We study exit times from a set for a family of multivariate autoregressive processes with normally distributed noise. By using the large deviation principle, and other methods, we show that the asymptotic behavior of the exit time depends only on the set itself and on the covariance matrix of the stationary distribution of the process. The results are extended to exit times from intervals for the univariate autoregressive process of order n, where the exit time is of the same order of magnitude as the exponential of the inverse of the variance of the stationary distribution.
Simulations of a model for the Northern Spotted Owl
Brita Jung
Quantitative Biology , 2014,
Abstract: In this paper, a branching process model of the Northern Spotted Owl is simulated. We focus on the time until extinction. It is shown how an approximation of the model with a multivariate autoregressive process works well near the equilibrium, but does not give a good estimate of the time until extinction. We also show that introduction of randomness in some of the parameters previously assumed to be constants shortens the time until extinction considerably.
Probleme mit Modernisierung als Interpretationsrahmen von sozialer Arbeit und Mütterlichkeit‘“ Problems with “Modernisierung als Interpretationsrahmen von sozialer Arbeit und ‘Mütterlichkeit’” (Modernization as Interpretive Structure for Social Work and ‘Motherliness’)
Brita Rang
querelles-net , 2004,
Abstract: Unver ndert ist das bereits 1986 von Christoph Sach e vorgelegte Buch nun ein drittes Mal, allerdings in einem anderen Verlag erschienen. Gegenstand ist die Entstehung der modernen beruflichen Sozialarbeit, die – so die These –, aus einer Verbindung von bürgerlich-kommunaler Wohlfahrtspflege und bürgerlich-konservativer Frauenbewegung hervorging. Deren ethisches Konzept der geistigen Mütterlichkeit‘ habe jedoch von Beginn an in einem Spannungsverh ltnis zur zunehmenden Verberuflichung und Bürokratisierung der sozialen Arbeit im Ersten Weltkrieg und der Weimarer Republik gestanden. Christoph Sach e’s 1986 work has been published for the third time in an unaltered form, albeit with a different publisher. The object of study is the origin of modern occupational social work that—according to the thesis—developed from the alliance of middle-class/municipal welfare work and the middle-class/conservative women’s movement. Their ethical concept of ‘spiritual motherliness’, however, maintained a tense relationship to the increasing bureaucratization of social work and the incorporation thereof as a mode of occupation during World War I and the Weimar Republic.
Improved Safety for Automotive Lithium Batteries: An Innovative Approach to include an Emergency Cooling Element  [PDF]
Peter Kritzer, Harry D?ring, Brita Emermacher
Advances in Chemical Engineering and Science (ACES) , 2014, DOI: 10.4236/aces.2014.42023
Abstract:

This paper describes a concept for an independent and redundant safety concept for Lithium batteries in Electric and Hybrid Electric Vehicles. This concept includes an emergency cooling system based on pressurized carbon dioxide (CO2). Since carbon dioxide (CO2) is a possible medium of future mobile air conditioning (MAC) systems, the MAC system can be utilized for the one-time emergency cooling described in this paper. In the first part of the paper, some major safety aspects of automotive Li batteries are highlighted. In the second section, the paper describes a technical approach, how these batteries can be made safer. Pressurized CO2, which is a promising candidate for cooling liquids used in future mobile air conditioning (MAC) systems, is used to effectively cool down an overheating or up-heating battery in a critical state. The safety system thereby is not based on an electrical effect, but on a direct and fast-reacting thermal conduction, avoiding a thermal runaway of individual cells. The application of the proposed system is to act preventively just before the thermal runaway gets uncontrollable. In this case, the limited amount of CO2, which is available in the MAC system, fulfils the emergency cooling requirements. The combination of standard car components for the concept leads to an only moderate increase of the total weight and the additional system costs. Therefore, the described system might be of interest for car, battery and air conditioning system producers. This paper explains that the synergetic combination of CO2-based MAC systems and Li-based batteries is an innovative approach to improve environmental compatibility in future vehicles. The concept is proven experimentally on a lab scale with battery cells and battery packs consisting of four serially connected cells, respectively.

New Geographies of Work: A Case Study from Sweden
Brita Hermelin,Kristina Trygg
Urbani Izziv , 2012,
Abstract: This paper describes and analyses the geography of work, i.e., the spatial patterns in where paid work is done. The geography of work may diverge from the geography of employment when paid work is done at the premises of client organizations, during commuting, on business trips, on external meetings, at home or at other places. The particular patterns in the geography of work depend on a number of factors, possibilities and constraints. The paper takes its point of departure from the debate about how structural economic changes resulting from evolving service industries and the development of Information and Communication Technology (ICT) entail new forms for the organization of paid work. Flexibility, reflexivity, flows and places are key concepts. The paper presents a case study from Stockholm that takes a workplace perspective and looks at knowledge-intensive work in a public sector organization. The empirical study analyses data from interviews, time diaries and a questionnaire. We analyse how the geography of work is the result of negotiations between different parties and in different arenas, and how this spatial pattern is the result of the character of work tasks and accessibility of ICT support. The discussion illustrates a complex picture of the coexistence of spatial fix and spatial flexibility, and how this may cause tensions but also convenient solutions for organizing and conducting paid work.
Patellar Tendonitis
Zaia, Brita,Gharahbaghian, Laleh
Western Journal of Emergency Medicine : Integrating Emergency Care with Population Health , 2011,
Abstract:
Poetiske augeblinkar: Ei lesing av Emily Dickinsons "The Soul has Bandaged Moments"
Brita Strand Rangnes
Nordlit : Tidsskrift i litteratur og kultur , 1999,
Abstract:
Poetiske augeblinkar: Ei lesing av Emily Dickinsons "The Soul has Bandaged Moments"
Brita Strand Rangnes
Nordlit : Tidsskrift i litteratur og kultur , 1999,
Abstract:
John Donne's "A Valediction: of weeping"
Brita Strand Rangnes
Nordlit : Tidsskrift i litteratur og kultur , 1999,
Abstract:
John Donne's "A Valediction: of weeping"
Brita Strand Rangnes
Nordlit : Tidsskrift i litteratur og kultur , 1999,
Abstract:
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