Search for dissertations about: "rejection ratio"

Showing result 1 - 5 of 30 swedish dissertations containing the words rejection ratio.

2. 1. On ischemia/reperfusion injury and rejection in concordant xenotransplantation to the rat

   Author : Daniel Jan Lukes; Göteborgs universitet; []
   Keywords : Concordant; xenotransplantation; rat; hamster; mouse; rejection; necrosis; PCr; ß-ATP; ROS; SOE light; I RP; IPC;

   Abstract : Studies in concordant (without preformed antibodies) rodent xenotransplantation (transplantation between species) models have focused, to date, on immunological disparities. In allotransplantation (transplantation within species), there is evidence suggesting that early ischemic events may contribute to later rejection episodes and to the development of chronicrejection features. READ MORE

4. 2. On signal separation by second order statistics

   Author : Henrik Sahlin; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; RPEM; rejection ratio; recursive prediction error method; MIMO; multi input multi output; source separation; image separation; identifiability; CRLB; system identification; signal separation; Cramér Rao Lower Bound; performance; convolutive mixtures;

   Abstract : .... READ MORE

5. 3. Improved components for 2SB THz receivers with enhanced sideband rejection performance

   Author : Hawal Marouf Rashid; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Thin-film Circuits; S-parameters Measurements; Sideband Separating Receivers; Superconducting Circuits; Millimetre Wave Mixers; Directional Coupler; Terahertz Technology; Waveguide Directional Coupler;

   Abstract : The thesis presents work done in improving the sideband rejection ratio for 2SB cryogenic radio astronomy receivers in general, but more specifically, for the future Onsala 20 m 3-mm receiver system and the ALMA Band 5. In order to attain better than 15 dB sideband rejection ratio over the entire bandwidth (approximately 26% RF fractional bandwidth and one octave the IF bandwidth), it is necessary to improve both RF and IF hybrid assembly to optimum performance, i. READ MORE

6. 4. Essays on the Assumption of Proportional Hazards in Cox Regression

   Author : Inger Persson; Kenneth Carling; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Informatics; computer and systems science; Proportional hazards; Cox regression; Proportionality assumption; Informatik; data- och systemvetenskap; Informatics; computer and systems science; Informatik; data- och systemvetenskap; statistik; Statistics;

   Abstract : This thesis consists of four papers about the assumption of proportional hazards for the Cox model in survival analysis. The first paper compares the hazard ratio estimated from the Cox model to an exact calculation of the geometric average of the hazard ratio when the underlying assumption of proportional hazards is false, i.e. READ MORE

7. 5. Immunocompromised Patients. Infections, Diagnostics and Nosocomial Transmission

   Author : Anna Stjärne Asplund; Infektionsmedicin; []
   Keywords : ;

   Abstract : The aim of the work presented in this thesis was to improve the management of infections in immunocompromised patients by studying aspects of diagnostics, epidemiology and nosocomial transmission. Infection and rejection are common complications in lung-transplant patients, and early diagnosis and treatment are important for a positive outcome. READ MORE