Sökning: "positive temperature coefficient"

Visar resultat 1 - 5 av 16 avhandlingar innehållade orden positive temperature coefficient.

1. 1. High temperature CTMP from birch

   Författare :Eva-Lotta Vesterlind; Jon Tore Eriksen; Mittuniversitetet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical engineering; Kemiteknik;

   Sammanfattning : This thesis is intended to contribute to understanding of the chemithermomechanical pulping of birch intended for high freeness grades. It focuses on the effects that conditions during pre‐treatment, i.e. LÄS MER

3. 2. Electrical properties of carbon black-filled polymers

   Författare :Per Bengtsson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; PTC; positive temperature coefficient; chloroprene; percolation; rubber; current noise; conducting fillers; thermal noise; electrical properties; 1 f noise; carbon black; polythylene;

   Sammanfattning : .... LÄS MER

4. 3. Silicon carbide field-effect devices studied as gas sensors for exhaust gas monitoring

   Författare :Peter Tobias; Ignaz Eisele; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; silicon carbide; high temperature; gas sensors; field effect devices; MISdevices; Schottky diodes; experimental design; reaction kinetics; mass transport; car exhaust; multipoint injection; response times; cylinder specific; on-board diagnosis;

   Sammanfattning : Metal-insulator-silicon carbide (MIS) structures have been studied as gas sensors. We have investigated how the sensors detect gases, how fast they do that, and how they could be used for exhaust gas monitoring.We have prepared simple field-effect devices, MIS-capacitors and Schottky diodes, on silicon carbide with platinum gates. LÄS MER

5. 4. Heat transfer in ordered porous media with application to batteries

   Författare :Amin Moosavi; Staffan Lundström; Anna-Lena Ljung; Tomas Muld; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; battery thermal management system; heat exchanger; cylindrical lithium-ion battery; cross-flow; analytical model; URANS model; thermal evaluation; wall effect; spacing effect; temperature distribution; Strömningslära; Fluid Mechanics;

   Sammanfattning : Environmental concerns, resource depletion, energy security, technological advancements, and global policies are just a few of the variables influencing the global energy perspective. In the case of technological advancement, lithium batteries play a key role in the development of a more sustainable energy infrastructure. LÄS MER

7. 5. Impacts of climate change on surface hydrology in the source region of the Yellow River

   Författare :Feifei Yuan; Avdelningen för Teknisk vattenresurslära; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Source region of the Yellow River; climate change; summer precipitation; ENSO; teleconnection pattern; sea surface temperature; Xinanjiang model; Rainfall-Runoff process;

   Sammanfattning : The source region of the Yellow River contributes about 35% of the total water yield in the Yellow River basin playing an important role for meeting the downstream water resources requirements. The declining water availability caused by climate change in the source region of the Yellow River is expected to have severe repercussions for the 110 million basin inhabitants in terms of water resources affecting agricultural productivity, municipal, and industrial water supply. LÄS MER