Sökning: "Kjellberg"

Visar resultat 21 - 25 av 62 avhandlingar innehållade ordet Kjellberg.

1. 21. Fully Nonlinear Unsteady Three-Dimensional Boundary Element Method for Force Predictions on a Restrained Hull in Waves

   Författare :Martin Kjellberg; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; time-dependent; BEM; nested domain; fully nonlinear; free-surface;

   Sammanfattning : There is a need from both academia and industry for more accurate and efficient methods for predicting the behavior of ships in a seaway. A large variety of methods with varying level of sophistication and accuracy already exists today. LÄS MER

3. 22. Fully Nonlinear Unsteady Three-Dimensional Boundary Element Method for Ship Motions in Waves

   Författare :Martin Kjellberg; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; BEM; potential flow; MEL; ship motions; free surface; wave resistance; fully nonlinear; time-dependent;

   Sammanfattning : The prediction of the behavior of ships in a seaway has been an important topic in ship design since the beginning of modern naval architecture. In recent years, computer simulations using numerical methods based on mathematical models of the ship hydrodynamics problem has become a valuable tool for researchers and engineers working in this field. LÄS MER

4. 23. Ionization of large molecules with short laser pulses

   Författare :Mikael Kjellberg; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysik; Photoelectron spectroscopy; Momentum mapping imaging; thermal ionization; above threshold ionization; molecular fusion; fullerenes; polyaromatic hydrocarbons; femtosecond-laser.;

   Sammanfattning : The decay dynamics of fullerenes and polyaromatic hydrocarbons (PAH) after femtosecond-laser excitation have been studied experimentally by electron momentum mapping and mass spectrometry. The electron spectra of fullerenes and large PAH-molecules were found to be exponentially decreasing with energy without any distinct peaks outside the photon energy. LÄS MER

5. 24. Zinc and human sperm chromatin

   Författare :Svante Kjellberg; Björn Afzelius; Linköpings universitet; []
   Nyckelord :MEDICINE; MEDICIN;

   Sammanfattning : X-rny microanalysis, Sephadex® chromatography of seminal plasma and exposure of spermatozoa to sodium dodecyl sulphate (SDS), were methods used to study the zinc content of sperm chromatin, the nature of the zinc binding ligands present in seminal plasma and the stability of the sperm chromatin in whole semen samples from fertile and infertile men. Split ejaculates were used to study the same variables in different fractions of the same ejaculate. LÄS MER

7. 25. Semiconductor Lasers with Gratings Defined by Electron Beam Lithography

   Författare :Torgil Kjellberg; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; lasers; field-stitching errors; single-mode stability; fiber-optic communication;

   Sammanfattning : This thesis deals with the fabrication and characterization of semiconductor lasers with gratings defined by electron-beam lithography (EBL). Both distributed-feedback (DFB) lasers for fiber-optic communication and grating-surface-emitting (GSE) lasers suitable for a number of novel applications, from free-space communication to optical processing, are treated. LÄS MER