In high ¡Vspeed digital circuits, in order to utilize the space of printed circuit boards(PCB) efficiently, the signal via is a heavily used interconnection structure to communicate different signal layers. However, the interconnection discontinuities will result in the degradation of the signal integrity and become a crucial issue for IC designers. To analyze this problem using finite difference time domain(FDTD) method, the stair case approach of interesting structure with curved metallic surface not only introduce errors due to inaccurate approximation, but consume much simulation time and memory required . In this thesis, a conformal FDTD method of locally distorted contours is presented. By modification of Maxwell¡¦s equations in integration form, we simulate the signal via successfully and discuss several interesting issues such as resonance in power/ground plane, the simultaneous switching noise(SSN), the effect of adding ground vias in PCB, and common-mode and differential-mode drives for source, etc.

Licentiatavhandling Malmö : Malmö högskola, 2009.

Cervical cancer is a global health problem and the most common cancer in women living in sub- Saharan Africa (SSA). Various barriers to cervical screening have been identified. These include cytology based screening. Cervical screening by means of visual inspection with 3% to 5% acetic acid (VIA) can be implemented in a wide range of settings as no laboratory processing is required. This study was a pilot study to determine the knowledge of women, employed by one institution in Tshwane, regarding cervical cancer, whether VIA screening would be acceptable, what the results of such screening would be as well as the practical lessons that could be learnt to improve the screening process. The research study was an exploratory, descriptive and contextual survey. The sampling method was convenient (n=31). Data were gathered by means of self-reports using structured interviews. The results of the screening were documented on a clinical record. The study provides evidence that VIA screening was acceptable to women. However the knowledge of women, despite having a higher level of education, was low. Although one of the participants was VIA positive, none was VIA positive/invasive cancer. Lessons learnt included that the number of women that could be screened in a given time should not be overestimated and that clinical breast examinations should be offered concurrently with cervical screening campaigns.

Licentiatavhandling Ronneby : Blekinge tekniska högskola, 2006.

Examensarbete.

Licentiatavhandling Karlshamn : Blekinge tekniska högskola, 2008.

Licentiatavhandling Karlshamn : Blekinge tekniska högskola, 2008.

Diss. Karlskrona : Blekinge tekniska högskola, 2009.

No description available.

Dissertação de mestrado integrado conduzida na Universidade de Maryland / Tese de mestrado integrado. Engenharia Química. Universidade do Porto. Faculdade de Engenharia. 2011