Sökning: "high current"

Visar resultat 1 - 5 av 3261 avhandlingar innehållade orden high current.

1. 1. Towards Low-Voltage, High-Current : A pioneering drive concept for battery electric vehicles

   Författare :Stefan Haller; Kent Bertilsson; Bengt Oelmann; Peng Cheng; Dieter Gerling; Mittuniversitetet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; low voltage; high current; EV; BEV; electrical machine; power electronics; MOSFET;

   Sammanfattning : The first electric low-voltage vehicles were constructed in the mid-19th century, but by the early 20th century they were progressively replacedby successors with internal combustion engines. As the consequences ofusing fossil fuels are better understood, our society is now transitioning back. LÄS MER

3. 2. Essays on economic outcomes of immigrants and homosexuals

   Författare :Lina) Lina (current name Aldén Andersson; Mats Hammarstedt; Bertil Holmlund; Växjö universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Labour supply; Labour force participation; Policy evaluation; Immigrants; Self-employment; Intergenerational transmission; Occupational choice; Earnings; Sexual orientation; Discrimination; Field experiment; Housing market; Internet.; Economics; Nationalekonomi; Economics; Nationalekonomi;

   Sammanfattning : This thesis consists of five essays on the economic outcomes of immigrants and homosexuals on the labour and housing market.Essay I evaluates the effect of an in-work benefit on the labour supply of single immigrant women by means of simulation. LÄS MER

4. 3. High-Efficiency SiC Power Conversion : Base Drivers for Bipolar Junction Transistors and Performance Impacts on Series-Resonant Converters

   Författare :Georg Tolstoy; Hans-Peter Nee; Stig Munk-Nielsen; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Silicon Carbide; Bipolar Junction Transistor BJT ; Resonant converter; Series-resonant converter SLR ; Base drive circuits; High- Efficiency Converters; High-Frequency Converters; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : This thesis aims to bring an understanding to the silicon carbide (SiC) bipolar junction transistor (BJT). SiC power devices are superior to the silicon IGBT in several ways. They are for instance, able to operate with higher efficiency, at higher frequencies, and at higher junction temperatures. LÄS MER

5. 4. Silicon Carbide BipolarTechnology for High Temperature Integrated Circuits

   Författare :Luigia Lanni; Zetterling Carl-Mikael; Sei-Hyung Ryu; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; silicon carbide SiC ; bipolar junction transistor BJT ; current gain; surface passivation; SiC etching; complementary bipolar; lateral PNP; Darlington transistors; SPICE modeling; high-temperature; integrated circuits; emitter coupled logic ECL ;

   Sammanfattning : The availability of integrated circuits (ICs) capable of 500 or 600° C operation can be extremely beneficial for many important applications, such as transportation and energy sector industry. It can in fact enable the realization of improved sensing and control of turbine engine combustion leading to better fuel efficiency and reduced pollution. LÄS MER

7. 5. From Current Collectors to Electrodes : Aluminium Rod Structures for Three-dimensional Li-ion Micro-battery Applications

   Författare :Gabriel Oltean; Kristina Edström; Leif Nyholm; Erik Kelder; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; 3D micro-batteries; aluminium; titanium oxide; current collectros; negative electrodes; electrodepostion; electrophoretic depostion; sol-gel synthesis;

   Sammanfattning : The potential use of 3D aluminium nanorod structures as current collectors and negative electrodes for 3D Li-ion micro-batteries was studied based on the use of relatively simple and cost-effective electrochemical and sol-gel deposition techniques.Aluminium rod structures were synthesised by galvanostatic electrodeposition using commercial porous membranes as templates. LÄS MER