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Visar resultat 1 - 5 av 103 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Noise in quantum point contacts

   Författare :Jan Peter Hessling; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; noise; 1 f-noise; elementary fluctuator; quantum point contact; flicker; two level system; impurity; öow frequency;

   Sammanfattning : .... LÄS MER

3. 2. Spin transfer torques and spin dynamics in point contacts and spin-flop tunnel junctions

   Författare :Alexander Konovalenko; Vladislav Korenivski; David W. Abraham; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; spin dynamics; spin transfer torques; point contacts; magnetization dynamics; Physics; Fysik;

   Sammanfattning : The first part of this thesis is an experimental study of the spin-dependent transport in magnetic point contacts. Nano-contacts are produced micromechanically, by bringing a sharpened non-magnetic (N) tip into contact with a ferromagnetic (F) film. LÄS MER

4. 3. Powerful tool for analysis of systems containing traction point contacts

   Författare :Mikael Törmänen; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; rolling and spinning hertzian point contacts; continuously variable transmission CVT ; traction drive variator; complete elliptical integrals; multi-body system MBS ; virtual prototyping;

   Sammanfattning : .... LÄS MER

5. 4. Friction and wear in rolling and sliding contacts

   Författare :Christer Spiegelberg; Sören Andersson; Roland Larsson; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; tribology; friction; wear; rolling and sliding contacts; Engineering mechanics; Teknisk mekanik;

   Sammanfattning : Mechanical products are always expected to perform better, last longer, be more environmentally friendly and preferably cost less. Rolling and sliding contacts are found in many mechanical products, and friction and wear in the contacts have a direct impact on the products’ ability to meet these demands. LÄS MER

7. 5. Extended Computational Module for Tractive Effort at Rolling and Spinning Point Contacts

   Författare :Mikael Törmänen; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; spin; thermal effects; Hertzian contact; continuously variable transmission; rolling resistance; speed pole; traction drive; multi-body system; efficient numerical procedure;

   Sammanfattning : One category of mechanical systems that contains power-transferring point contacts is traction drive variators. These variators can be used in different concepts for Continuously Variable Transmissions (CVTs) and in vehicle applications, in order to achieve optimum engine operating conditions leading to improved driveability, reduced fuel consumption and an increase in overall vehicle performance. LÄS MER