Sökning: "Orders of change"

Visar resultat 36 - 40 av 92 avhandlingar innehållade orden Orders of change.

1. 36. Detection of Partial Discharges at Fast Rising Voltages

   Författare :Thomas Hammarström; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Partial discharges; cavities; repetitive voltages; high dV dt.; square like voltages; short rise time; measurements;

   Sammanfattning : The present demand for higher efficiency and flexibility in the energy sector has ledto an increased use of power electronic generated waveforms as these allow energyconversion between different frequencies including DC. The generated waveformsare usually synthesized by so called Pulse Width Modulation (PWM) techniques,where the desired waveform is approximated by a number of square shaped pulseswith a short rise time. LÄS MER

3. 37. Cell models for evaluation of adult and developmental neurotoxicity : Focus on acrylamide

   Författare :Kristina Attoff; Anna Forsby; Åsa Fex-Svenningsen; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; neurokemi med molekylär neurobiologi; Neurochemistry with Molecular Neurobiology;

   Sammanfattning : This thesis is aimed at summarizing some of the alternative in vitro methods and models that have been used to study both adult and developmental neurotoxicity (DNT), and also to pinpoint some of the important aspects of using alternative in vitro methods. The aim of the papers included in this thesis was to challenge the hypothesis that neurotoxicity and DNT of chemicals can be studied using robust endpoints for proliferation and neural differentiation, such as neurite outgrowth, mRNA expression and protein expression, in two different cell lines. LÄS MER

4. 38. Studies of Heavy Ion Induced Desorption in the Energy Range 5-100 MeV/u

   Författare :Emma Hedlund; Lars Westerberg; Oleg Malyshev; Manfred Leisch; Uppsala universitet; []
   Nyckelord :Physics; Heavy Ion Induced Desorption; Ultra High Vacuum; NEG Coating; Heavy Ion Accelerators; Test Particle Monte-Carlo; Gas Flow; Throughput; Laser Refractometry; Metrology; Fysik;

   Sammanfattning : During operation of heavy ion accelerators a significant pressure rise has been observed when the intensity of the high energy beam was increased. The cause for this pressure rise is ion induced desorption, which is the result when beam ions collide with residual gas molecules in the accelerator, whereby they undergo charge exchange. LÄS MER

5. 39. Tudelad trots allt : dualismens överlevnad i den svenska staten 1718-1987

   Författare :Catrin Andersson; Rune Premfors; Karl-Göran Algotsson; Stockholms universitet; []
   Nyckelord :Sweden; state administration; state organization; dualism; historical institutionalism; political institutions; institutional change; institutional stability; institutional conversion; institutional layering;

   Sammanfattning : On May 1, 1720 the Swedish Riksdag took a seemingly peripheral decision which would however prove to have great and enduring consequences for the organization of the country’s central state administration. The model adopted then is today often referred to as the ‘dualism’ of the Swedish state. LÄS MER

7. 40. Performing Ambiguity?: Following Multiplicity in Shared Mobility Markets

   Författare :Gianluca Chimenti; Handelshögskolan i Stockholm; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES;

   Sammanfattning : How do markets change and develop over time? The present PhD project focuses on the dynamic effects of market change in the context of the sharing economy. This phenomenon is of particular interest since it concerns how alternative market forms – such as gifting, collaborating, accessing – are challenging established market conceptions. LÄS MER