Pusat Pengajian Sains Fizik - Tesis

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Study Of Nambu And Cho-Maison Monopole - Antimonopole Pair In Weinberg - Salam Model
(2024-12)
Zhu, Dan
In this dissertation, two types of monopole-antimonopole pair (map) solutions are found in the weinberg-salam model. The maps are of crucial importance. This is because if magnetic monopoles were detected in the lab, it would be through pair production, which is precisely the configuration described by the maps. In this work, nambu map was investigated first, which consists of a monopole and an antimonopole bounded by a z0 flux string. It was also confirmed that the nambu map is the electroweak sphaleron, which plays an important role in baryogenesis. In this research, 300 numerical solutions were obtained corresponding to the nambu map with physical higgs self-coupling, β = 0.7782, and weinberg angle, tan θw = 0.5358. Total energies of these solutions were calculated and confirmed that they reside in a range of 13.17–21.02 tev. The rest mass of the system was estimated to be 14.17 ± 0.49 tev which strongly indicates that this configuration might be detected in the near future. In addition, evidence was found indicating an oscillatory phenomenon in the energy density along the string connecting the poles, associated with the symmetry of the solutions. Further investigations revealed that both magnetic charge density and electric current of the u(1) gauge field exhibit similar patterns, which contribute directly to the energy density oscillation.
Design, Fabrication And Performance Analysis Of Su-8 Piezoresistive Micro Pressure Sensor
(2012-07)
Wong, Wah Seng
In this thesis, su-8 piezoresistive micro pressure sensor is designed, modeled and fabricated, and its performance is characterized. As piezoresistive micro pressure sensor is commonly fabricated using silicon, many issues and challenges such as selection of piezoresistor material, release method and sensitivity enhancement need to be tackled in order to develop successful su-8 piezoresistive micro pressure sensor. The novelty of this research focuses on integrating micro pressure sensor with su-8/silver composite (su-81ag) as piezoresistor, ohp transparency as substrate and novel dry release method as release protocol. Su-8 is selected as structural material for micro pressure sensor due to its low cost and easy to fabricate. Besides, the low young's modulus of su-8 provides better sensitivity compared to silicon. Analytical method using small deflection theories of plate and fmite element analysis (fea) via ansys® are carried out to characterize the diaphragm thickness. Both methods show thickness at 147j.1m provides optimum sensitivity and linearity for 6000j.1m square su-8 diaphragm. Fea is also applied to find the most suitable geometry and the best location of piezoresistors for improved sensitivity. A simple and low cost protocol is established to fabricate su-8 based pressure sensor.
Factors Influencing Student Engagement With Game Elements Among Undergraduate Students In Saudi Arabia
(2025-07)
Freeh M , Allehaidan Ahmed,
This research aimed to examine the direct effect of Unified Theory of Acceptance and Use of Technology (UTAUT) components (i.e., performance expectancy, effort expectancy, social influence, and facilitating conditions), on the attitude toward using gamification as well as on students’ engagement (i.e., skill engagement and participant engagement).
Enhancement Of ZnO-Based UV Photodetectors By Incorporating Bi₂O₃, Ag, And Ge Nanostructures Synthesized Using Laser Ablation In Liquid
(2025-07)
Marzouq B., Alharbi Abdullah
This research enhances the efficiency of UV photodetectors through the synthesis and integration of nanoparticles using laser ablation techniques. The study investigates the effects of bismuth oxide nanosheets (Bi2O3-Nsh), silver nanoparticles (AgNPs), and germanium nanowalls (GeNWs) on ZnO/Si-based UV photodetectors.
Investigation Of Debris Flow In The Muda River Basin Kedah, Using Remote Sensing, Hydrology, Gis, And Geoelectrical Methods
(2025-04)
Sirajo, Abubakar
This study investigates the July 4, 2022, debris flow event in Kampung Iboi, Muda River Basin (MRB), Kedah, which caused an estimated RYM25.91 million in financial losses and claimed three lives. Employing a multidisciplinary approach of remote sensing, hydrology, Geographic Information System (GIS), and geoelectrical techniques, the study identifies surface and subsurface factors contributing to debris flow and delineates hazard-prone areas, with an emphasis on preventive measures

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