Brain Cancer Detection Using U-Shaped Slot VIVALDI Antenna and Confocal Radar Based Microwave Imaging Algorithm

VIVALDI antenna has been designed to work at frequency band [2.33-7.09] GHz with a maximum gain of 6.62dB. The antenna performance has been improved by creating a U-shaped slot on the upper layer of the antenna. etching U shape slot provides an improvement of 35.28% in return loss, 2.7% in bandwidth and 10% in gain. Spherical head phantom which consists of four layers whose dielectric properties have been compatible with their natural values has been designed by CST package to test the efficiency of antenna in the microwave imaging systems .1g average specific absorption rate (SAR) values has been measured in case the human brain without tumor and achieved international healthy standards. After that, it has been measured the value of SAR in case the human brain with tumor and observed that SAR value increased. Finally, monostatic radar-based confocal microwave imaging algorithm has been used to reconstruct image which appeared tumor location inside the head phantom. MATLAB software has been used to process data that obtained by CST package and generate the tumor image

Influence of Vehicle Inspection Tests on Crashworthiness of School Bus in Nairobi County, Kenya

The vehicle structure, designs and materials on school bus body crashworthiness as regulated by different government agencies in bus body building firms was the topic under research study. In Kenya, thousands of vehicles are involved in vehicle collisions or crashes every year resulting in fatal accidents and severe injuries to the passengers. The specific objective was the influence of vehicle inspection testson crashworthiness of school bus in Nairobi City County. This study adopted Dym’s, Suh’s Axiomatic theory. The pragmatic paradigm and explanatory research design were used. The target population was 1500 respondents from bus body building firms and government regulatory institutions. The sample size was 315 respondents. Questionnaires,interview schedules and observation were data collection instruments. Expert judgment was used to establish validity ofthe questionnaires. Cronbach’s Alpha Coefficient was used to determine the reliability of the research instrument. The datacollected was analyzed using descriptive and inferential analysis with the aid of SPSS V22 software. The coefficient ofdetermination (R squared) of .206 showing that 20.6% of the variation in crashworthiness of a bus can be explained byvehicle inspection tests. There was a positive significant influence of vehicle inspection tests on crashworthiness of abus (β=0.396 and p <0.05). The study concluded that the vehicle inspection tests had a significant influence on thecrashworthiness of school bus. The management of school bus body construction companies need to conduct all the terminaltest needed before releasing the vehicle in order to enhance crashworthiness of a bus. The Transport authority shouldexamine and check the mandatory requirements and periodically amend them in accordance with the safety, engineering and ecological standardization