Sökning: "pin structure"

Visar resultat 1 - 5 av 27 avhandlingar innehållade orden pin structure.

1. 1. Immersions and their self intersections

   Författare :Tobias Ekholm; Uppsala universitet; []
   Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Mathematics; Regular homotopy; generic immersion; finite order invariant; Vassiliev invariant; self intersection; diffeotopy; framing; spin structure; pin structure; embedding; Seifert surface; linking; 24; MATEMATIK; MATHEMATICS; MATEMATIK; matematik; Mathematics;

   Sammanfattning : Regular homotopy classes of immersions of the k-dimensional sphere Sk into (k + n)-dimensional Euclidean space Rk+n are known to form finitely generated Abelian groups. It is known how to calculate the regular homotopy class of a generic immersion Sk → R2k in terms of its self intersection. LÄS MER

3. 2. Ultrahigh-Voltage Silicon Carbide Device Performance, Requirements, and Limitations in High-Power Applications

   Författare :Daniel Johannesson; Hans-Peter Nee; Staffan Norrga; Muhammad Nawaz; Alberto Castellazzi; KTH; []
   Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; 4H-SiC; Current Filamentation; Device Characterization; Dynamic Avalanche; JTE Structure; Junction Termination Extension Design; SiC BJT; SiC GTO Thyristor; SiC IGBT; SiC MOSFET; SiC PiN Diode; Silicon Carbide; TCAD Simulation; Wide bandgap device; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : The increased awareness of the on-going climate change accelerates the electric energy system transformation from fossil-fueled power sources towards systems with larger portions of renewable energy sources. Moreover, the grid infrastructure requires reinforcements to cope with increasing electrical energy demand. LÄS MER

4. 3. Synthesis, conformational analysis, and biological evaluation of peptides from E. coli P pilus proteins

   Författare :Katarina Flemmer Karlsson; Centrum för analys och syntes; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NMR spectroscopy; CD spectroscopy; peptide structure; ELISA; solid-phase peptide synthesis; peptide; P pili; chaperone; Organic chemistry; Organisk kemi;

   Sammanfattning : Many bacteria utilize hairlike protein appendages (pili) to attach themselves to mucosal cell surfaces in the host organism. The pilus is assembled from protein subunits synthesized inside the bacteria and transported to the outer cell wall for incorporation into the growing pilus. LÄS MER

5. 4. Recognition and Evaluation by Video Synthesis Methods and Symmetry Features

   Författare :Dereje Teferi Lemma; Chalmers University of Technology; []
   Nyckelord :NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; Biometrics; eye detection; video synthesis; liveness detection; camera calibration; damascening; Generalized Structure Tensor; symmetry codes;

   Sammanfattning : Biometrics is being increasingly utilized for person authentication. It requires little or no efforts from the user as compared to traditional non-biometric systems where the user has to memorize PIN codes and passwords or carry pass cards and keys that can be easily forgotten or lost. LÄS MER

7. 5. Efficiency and wear properties of spur gears made of powder metallurgy materials

   Författare :Li Xinmin; Ulf Olofsson; Giovanni Straffelini; KTH; []
   Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Powder Metallurgy Gears; Efficiency; Wear; Friction; Porosity Structure; FZG gear test rig; Machine Design; Maskinkonstruktion;

   Sammanfattning : Powder metallurgy (PM) is usually used in manufacturing parts with complex geometries, such as gears and structural parts. The main attractions of PM are the high rate of material utilization, environmental friendliness of production, economic advantages (especially for complex geometries), and possibility of obtaining lighter components. LÄS MER