Sökning: "Multilevel"

Visar resultat 26 - 30 av 251 avhandlingar innehållade ordet Multilevel.

1. 26. Efficiency in Education - A Multilevel Analysis

   Författare :Staffan Waldo; Nationalekonomiska institutionen; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; economic systems; economic policy; Nationalekonomi; ekonometri; ekonomisk teori; ekonomiska system; ekonomisk politik; economic theory; econometrics; Data Envelopment Analysis; Economics; Education; Efficiency;

   Sammanfattning : Sweden spends altogether about 4.5% of GDP on primary, secondary and upper secondary school. Considering the magnitude of this investment it is important that these resources are used efficiently. In this thesis efficiency in public education is analysed on three different levels: The municipal level, the school level, and the individual level. LÄS MER

3. 27. Investigating practice variation in a changing primary care. A multilevel perspective on The Skaraborg Primary Care Database

   Författare :Per Hjerpe; Socialepidemiologi; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Medical records systems computerized ; Databases factual; Reimbursement incentive; Physician s Practice Patterns; Multilevel analysis; Primary health care;

   Sammanfattning : Background and Aims: Differences in the clinical care of patients have been explained through the concept of practice variation, that is, the occurrence of established local medical procedures that varies between geographic areas. The primary measures introduced to eliminate undesirable differences in medical care are the introduction of medical guidelines and economical incentives that rewards the desired behaviour. LÄS MER

4. 28. Balancing mobility and solidarity: Multilevel Governance Challenges of East-West EU Mobility in Austria, the Netherlands and Sweden

   Författare :Karin Zelano; Göteborgs universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; EU mobility; policy; multilevel governance; national institutions; problem definitions.; policy; multilevel governance; problem definitions.; national institutions;

   Sammanfattning : Each year, millions of Europeans exercise their right to move freely between EU member states – particularly so since the eastern enlargements in the 2000s. Mobility from eastern and central Europe (CEE) affects host member states in a number of ways; economically, legally, administratively and socially. LÄS MER

5. 29. 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

7. 30. On the Internal Dynamics and AC-Motor Drive Application of Modular Multilevel Converters

   Författare :Antonios Antonopoulos; Hans-Peter Nee; Lennart Harnefors; Hirofumi Akagi; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Capacitor-Voltage Control; Controller Interaction; Converter Control; Energy Balance; Lyapunov Stability; Medium-Voltage Drives; Modular Multilevel Converter; Modulation; Open-Loop Control; Optimization; Variable-Speed Drives; Voltage-Source Converter.; Energibalans; Kondensatorspänningsstyrning; Lyapunov-stabilitet; Mellan-spänning drivsystem; Modulation; Modulär multinivåomvandlare; Omvandlarstyrning; Optimering; Regulatorväxelverkan; Spänningsstyva omvandlare; Varvtalsstyrda motordrifter; Öppen styrning.; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : This thesis is an effort to investigate the operation and the performanceof modular multilevel converters (M2Cs). Proven to be the most promisingtopology in high-voltage high-power applications, it is necessary to put aneffort in understanding the physical laws that govern the internal dynamicsof such converters, in order to design appropriate control methods. LÄS MER