Sökning: "fractal"

Visar resultat 21 - 25 av 96 avhandlingar innehållade ordet fractal.

1. 21. Decoupling and Evaluation of Multiple Antenna Systems in Compact MIMO Terminals

   Författare :Hui Li; Sailing He; Cyril Luxey; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Multiple antennas; mutual coupling; compact antennas; frequency reconfigurable antennas; pattern reconfigurable antennas; meta-material antennas; mobile antennas; fractal antennas; collocated antennas; antenna measurement.;

   Sammanfattning : Research on multiple antenna systems has been a hot topic in recent years due to the demands for higher transmission rate and more reliable link in rich scattering environment in wireless communications. Using multiple antennas at both the transmitter side and the receiver side increases the channel capacity without additional frequency spectrum and transmitted power. LÄS MER

3. 22. Fractal analysis and surface characterization by atomic force microscopy and other methods

   Författare :Anders Mannelquist; Luleå tekniska universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysik; Fysik;

   Sammanfattning : This licentiate thesis focuses on fractal analysis of surfaces measured with atomic force microscopy (AFM) and other microscopic methods, and the correlation between fractal dimensions and tensile strength for pre-treated stainless-steel surfaces. The disadvantage is that the probe biases the image and the roughness measurement. LÄS MER

4. 23. Improved mine planning using geostatistics and fractal geometry for geologic modeling

   Författare :Mark E. Kuchta; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och Berganläggningsteknik;

   Sammanfattning : In planning a mining operation, the geologic model of the orebody forms the basis for the layout of the development workings and for the eventual layout for the production mining. The problem faced by the mine planning and geology team is to determine what level of sampling is necessary in order to accurately construct the geologic model of the orebody such that mining can be done at a low cost and without surprises. LÄS MER

5. 24. Smoothness properties of solutions to Dirichlet problems in domains with a fractal boundary

   Författare :Kaj Nyström; Umeå universitet; []
   Nyckelord :;

   Sammanfattning : .... LÄS MER

7. 25. Fractal surface dimensions and Li ion transport processes in metal oxide based films

   Författare :Maria. Strömme; Uppsala universitet; []
   Nyckelord :;

   Sammanfattning : .... LÄS MER