Sökning: "Cylindrical Geometry"

Visar resultat 11 - 15 av 43 avhandlingar innehållade orden Cylindrical Geometry.

1. 11. Nonlinear Isoviscous Behaviour of Compliant Journal Bearings

   Författare :Matthew Cha; Sergei Glavatskih; Ilmar Santos; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Compliant Journal Bearings;

   Sammanfattning : Plans to shut down nuclear power plants in some European countries as well as increased electricity production by wind and solar power will increase the work load on hydroelectric power plants in the future. Also, due to the power grid regulations, hydroelectric power plants undergo more frequent start-ups and shut-downs. LÄS MER

3. 12. Shape and material optimization for antenna applications

   Författare :Per Jacobsson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; explicit-implicit time stepping; sensitivity analysis; Nitsche s method; total scattering cross section; shape and material optimization; array antennas; finite element method;

   Sammanfattning : In this thesis, a gradient-based method for shape and material optimization fortwo antenna applications is presented: minimization of the active reflectioncoefficient for conformal array antennas; and minimization of the totalscattering cross section for cylindrical scatterers. The sensitivity of theobjective function with respect to changes of the shape and material of the geometry isexpressed in terms of the original field problem and an adjoint field problem. LÄS MER

4. 13. Cone-Beam Reconstruction Using Filtered Backprojection

   Författare :Henrik Turbell; Per-Erik Danielsson; Michel Defrise; Linköpings universitet; []
   Nyckelord :TECHNOLOGY; TEKNIKVETENSKAP;

   Sammanfattning : The art of medical computed tomography is constantly evolving and the last years have seen new ground breaking systems with multi-row detectors. These tomographs are able to increase both scanning speed and image quality compared to the single-row systems more commonly found in hospitals today. LÄS MER

5. 14. Electronic Properties of Nanotubes

   Författare :Alex Kleiner; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : This thesis deals with various aspects of the electronic properties of carbon nanotubes and of generic nanotubes in magnetic fields. Carbon nanotubes are highly symmetric objects on the nanometer scale which show an interesting interplay of their geometry with electronic properties. LÄS MER

7. 15. Berechnung der Zahnfußspannungen von Beveloidverzahnungen

   Författare :Jannik Henser; Christian Brecher; Christian Brecher; Peter W. Gold; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : Beveloid gears are conical gears which are derived from cylindrical involute gears to transmit torque and rotation for parallel, intersecting or skew axes. While defined by the same data as cylindrical involute gears, the addendum modification factor, however, changes linearly to the tooth width. LÄS MER