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Visar resultat 16 - 20 av 175 avhandlingar som matchar ovanstående sökkriterier.

1. 16. Grid reinforcing wind generation

   Författare :Nayeem Ullah; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; transient stability; variable speed wind turbine; long term voltage stability; short term voltage stability; frequency converter;

   Sammanfattning : In this thesis, effects of some grid assisting possibilities that wind turbines could be equipped with, are investigated. The background is that concerns regarding the stability of the already existing power system in the presence of large wind farms have been risen. LÄS MER

3. 17. Blindness and Second Language Acquisition : Studies of Cognitive Advantages in Blind L1 and L2 speakers

   Författare :Helena Smeds; Niclas Abrahamsson; Lars-Göran Nilsson; Loraine Obler; Stockholms universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; Early blindness; late blindness; L1 speakers; L2 speakers; cognitive advantages; second language acquisition; phonological short-term memory; recognition memory; episodic memory; speech perception in noise; accentedness in L2 speech; Bilingualism; tvåspråkighet;

   Sammanfattning : The aim of this study is to investigate whether blind individuals display cognitive advantages over sighted individuals with regard to second language acquisition. Previous studies from neuropsychology have indicated that this is the case. LÄS MER

4. 18. Effekter av övning och instruktion på testprestation : Några empiriska studier och analyser avseende övningens och instruktionens betydelse för testprestationen

   Författare :Widar Henriksson; Umeå universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Practice; instruction; coaching; item format; test-taking behaviour; test-wiseness; validity;

   Sammanfattning : This report consists of a compilation of a number of studies, which all of them have dealt with the effects of practice and instruction upon a person's test results. A literature review based on a dichotomy of practice and instruction under short-term and long-term conditions respectively, as well as on the denign of the investigations and certain characteristics of the individuals, resulted in general as well as in more specific statements on the arising of practice and instruction effects. LÄS MER

5. 19. Moisture Induced Stresses in Timber Structures

   Författare :Johan Jönsson; Avdelningen för Konstruktionsteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Teknik; load carrying capacity; Technological sciences; reinforcement; short-term strength perpendicular to grain; internal stresses; glulam; contact free measuring technique moisture gradients;

   Sammanfattning : Wood is a hygroscopic material; always striving to reach equilibrium with the surrounding air, and consequently the moisture content is different in different climate conditions. The strength of wood is directly dependent on the moisture content, lower moisture content leads to increasing strength. LÄS MER

7. 20. The search for reversibility of Idiopathic normal pressure hydrocephalus : Aspects on intracranial pressure measurments and CSF volume alteration

   Författare :Niklas Lenfeldt; Jan Malm; Anders Eklund; Katrine Riklund-Åhlström; John D. Pickard; Umeå universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Idiopathic normal pressure hydrocephalus; intracranial pressure; subcortical ischemia; neuronal integrity; cortical activation.; infusion test; cerebrospinal fluid dynamics; outflow resistance; compliance; elastance; proton spectroscopy; functional MRI; external lumbar drainage; Neurology; Neurologi;

   Sammanfattning : BACKGROUND: Idiopathic normal pressure hydrocephalus (INPH) is still a syndrome generating more questions than answers. Today, research focuses mainly on two areas: understanding the pathophysiology – especially how the malfunctioning CSF system affects the brain parenchyma – and finding better methods to select patients benefiting from a shunt operation. LÄS MER