Sökning: "model tests"

Visar resultat 16 - 20 av 1353 avhandlingar innehållade orden model tests.

1. 16. Modelling of Groundwater Conditions in Silts and Fine Sands. A Study of Induced Groundwater Changes Based on Laboratory and Full-Scale Field Tests

   Författare :Marius Tremblay; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fine sand; laboratory tests; numerical simulation; silt; soil mechanics; groundwater; pore pressure; field tests; soil matric suction; partially saturated soil; groundwater conditions;

   Sammanfattning : Every day, geotechnical engineers have to deal with groundwater problems. In order to find suitable solutions to these problems, modelling of the groundwater conditions and their variations in time has to be performed. A study of the groundwater conditions in silts and fine sands was made including laboratory and full-scale field tests. LÄS MER

3. 17. Dimensions of validity : studies of the Swedish national tests in mathematics

   Författare :Anna Lind Pantzare; Christina Wikström; Per-Erik Lyrén; Gordon Stobart; Umeå universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; national tests; validity; interrater reliability; standard setting; linking; subscores; test development; didactics of educational measurement; beteendevetenskapliga mätningar;

   Sammanfattning : The main purpose for the Swedish national tests was from the beginning to provide exemplary assessments in a subject and support teachers when interpreting the syllabus. Today, their main purpose is to provide an important basis for teachers when grading their students. LÄS MER

4. 18. Development and Characterisation of a Rat Model of Parkinson's Disease

   Författare :Matilde Negrini; Beteendevetenskapligt laboratorium; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Parkinson s disease PD ; behavior; gene therapy; rat model; dopamine; alpha-synuclein; AAV Adeno-Associated virus ; PFFs;

   Sammanfattning : Preclinical rodent models of Parkinson’s Disease (PD) based on alpha-synuclein (αSyn) present some of the pathological hallmarks of the human condition, such as the progressive loss of dopaminergic neurons in the substantia nigra (SN) and the development of behavioural deficits. However, numerous reports on these models highlighted the variable outcomes that might originate from them if not validated properly. LÄS MER

5. 19. Properties and tests for some classes of life distributions

   Författare :Bengt Klefsjö; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Life distribution; survival function; exponential distribution; IFR; IFRA; NBUE; DMRL; HNBUE; shock model; total time on test transform; testing of exponentiality;

   Sammanfattning : A life distribution and its survival function F = 1 - F with finitemean y = /q F(x)dx are said to be HNBUE (HNWUE) if F(x)dx < (>)U exp(-t/y) for t > 0. The major part of this thesis deals with the classof HNBUE (HNWUE) life distributions. LÄS MER

7. 20. Uptake and toxicity of brominated flame retardants and pesticides : Studies on littoral organisms and model communities

   Författare :Kerstin Gustafsson; Nils Kautsky; Kirsten Christoffersen; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; aquatic ecotoxicology; ecological interactions; indirect effects; model community studies; toxicity; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi;

   Sammanfattning : In this thesis, brackish and freshwater littoral model communities (microcosms) of varying size and complexity were used to study the effects of brominated flame retardants (BFRs) and pesticides. The brackish water microcosms consisted of natural water, sediment and associated organisms, while the larger freshwater microcosms also contained submersed macrophytes (Elodea canadensis). LÄS MER