Sökning: "two level"

Visar resultat 11 - 15 av 6882 avhandlingar innehållade orden two level.

1. 11. Energy Efficiency Comparison Between Two-level and Multilevel Inverters for Electric Vehicle Applications

   Författare :Oskar Josefsson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electric Vehicle EV ; Drive Cycle; Plug-in Electric Vehicle PEV ; Multilevel Inverter MLI ; Two-level Inverter TLI ; Efficiency.; Integrated Charger;

   Sammanfattning : In order to contribute to the development of energy and cost efficient electric vehicles, a thorough analysis of two different electric converter topologies is performed, considering different drive cycles and different control strategies. In the electric vehicles available on the market today, a high voltage (200−400 V ) battery pack composed of several battery modules is connected to one or more inverters which create AC voltages to the electric propulsion machines. LÄS MER

3. 12. Superinductance and fluctuating two-level systems: Loss and noise in disordered and non-disordered superconducting quantum devices

   Författare :David Niepce; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Disordered Superconductors; Nanowire; Superinductor; Quantum information; Superconducting circuits; Superinductance; TLS; Two-level Systems;

   Sammanfattning : In this thesis, we first demonstrate that a disordered superconductor with high kinetic inductance can realise a microwave low-loss, non-dissipative circuit element with impedance greater than the quantum resistance. This element, known as a superinductor, can suppress the fluctuations of charge in a quantum circuit. LÄS MER

4. 13. Samhällets tvåsidighet : Aktör-struktur i tre forskningsansatsers program och tillämpningar

   Författare :Mikael Rundqvist; Sweden University of Gothenburg Department of political science; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Actor factors; actor theoretical approach; actor-structural theoretical approach. application; interna! logical congruence; relational concept of structure; research programme; structural theoretical approach; structure factors; two-sided leve! realism;

   Sammanfattning : Samhällsvetenskapliga portalfigurer som Durkheim, Marx och Weber har medverkat i diskussionen om aktör och struktur. Diskussionen om intentioner; agerande och samhällsstrukturer pågår fortfarande. Om de samhällsvetenskapliga fenomenen utgår från individen – aktören – och/eller dess omgivning - strukturen - är en evig fråga. LÄS MER

5. 14. Två musikpedagogiska fält : en studie om kommunal musikskola och musiklärarutbildning

   Författare :Sture Brändström; Christer Wiklund; Umeå universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; music education; music pedagogy; music instruction; ethnomu-sicology; music sociology; music teacher education; Musikpedagogik;

   Sammanfattning : The thesis consists of two parts. One is directed towards municipal music schools, and one deals with music teacher education at university level. The purpose was to investigate the recruitment to these two educations, and to describe and explain how different student groups perceived and used their education. LÄS MER

7. 15. Two worlds, one goal : A Clinician’s Perspective on Laboratory Analyses in Anticoagulant Treatment

   Författare :Kerstin Arbring; Tomas Lindahl; Srinivas Uppugunduri; Margareta Holmström; Gerd Lärfars; Linköpings universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Anticoagulants; Warfarin; DOAC; PT-INR; VKORC1;

   Sammanfattning : Almost precisely a century ago, in the 1920s and 1930s, cattle bled to death in North America after being fed moldy hay containing sweet clover, the yellow Melilotus officinalis, and the white Melilotus albus. The toxic substance in the hay inhibiting blood coagulation was identified and named dicumarol. LÄS MER