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Visar resultat 1 - 5 av 37 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Modelling the Variability of Bending Strength in Structural Timber - Length and Load Configuration Effects

   Författare :Tord Isaksson; Avdelningen för Konstruktionsteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; code; reliability-based design; Weibull; test standard; load configuration effect; length effect; weak section; machine grading; visual grading; variability; Structural timber; bending strength; simulation; monte carlo simulation.; Building construction; Byggnadsteknik;

   Sammanfattning : The load carrying capacity of a beam of structural timber is dependent both on the span of the beam and the type of loading. The longer the beam and the more uniform the moment distribution, the lower the load carrying capacity. This phenomenon is due to the variability of material properties within a piece of timber. LÄS MER

3. 2. Estimation and Testing in Panel Data with Cross-Section Dependence

   Författare :Simon Reese; Nationalekonomiska institutionen; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Factor-augmented panel regression; CCE estimation; cross-section dependence; common factor models; Factor-augmented panel regression; CCE estimation; cross-section dependence; common factor models;

   Sammanfattning : This thesis makes a contribution the econometrics of panel data with cross-section dependence (CSD). It consists of five self-contained papers. LÄS MER

4. 3. Vitamin D, muscle strength, prolonged labour, Caesarean sections and lifestyle : Clinical and intervention studies in pregnant Somali and Swedish women and new mothers

   Författare :Paul Kalliokoski; Monica Löfvander; Maria Bullarbo; Uppsala universitet; []
   Nyckelord :: caesarean section; dystocia; immigrant; muscle strength; obstetric labour complications; osteomalacia; physical performance; Somalia; vitamin D; vitamin D deficiency; Family Medicine; Allmänmedicin;

   Sammanfattning : Long-term severe vitamin D deficiency may cause osteomalacia with muscle weakness, pain, soft bones, cramps and eventually death. In a pilot study, I found many Somali women to be vitamin D deficient and very weak. LÄS MER

5. 4. Nyquist Stability Analysis of a VSC-HVDC System with a Distributed Parameter DC-cable Model

   Författare :Yujiao Song; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electric power transmission; Nyquist stability analysis; VSC-HVDC system; Distributed parameter cable model; Small gain theorem.; Weak AC-grid;

   Sammanfattning : Voltage source converter based high voltage direct current (VSC-HVDC) transmission systems have now been in operation since 1997 as it is a reliable and flexible method of power transmission. This thesis focuses on small signal dynamics of such systems, emphasizing stability properties. LÄS MER

7. 5. The Aspirants : How faith is built in emerging occupations

   Författare :Rebecca Ye; Charlotta Stern; Mikaela Sundberg; Phillip Brown; Stockholms universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; weak-form occupations; transitions; temporality; anticipation; career scripts; projections; school culture; higher vocational education and training; yrkeshögskola; Sociology; sociologi;

   Sammanfattning : Anticipating future demands in skills and workforce development has been a longstanding practice and challenge for governments and policy-makers. While such developments are examined closely at the national and regional levels, an even more pressing issue is to advance our understanding of how people who take on jobs in new and emerging fields embark on and persist in their occupational pathways. LÄS MER