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Articles 1 - 7 of 7
Full-Text Articles in Engineering Physics
Growth Of Semi-Polar (11-22) Gan Epitaxial Layer On M-Plane Sapphire Via Mocvd, Anuar Mohd Afiq
Growth Of Semi-Polar (11-22) Gan Epitaxial Layer On M-Plane Sapphire Via Mocvd, Anuar Mohd Afiq
Student Works (2020-2029)
In the past few years, semi-polar (11-22) GaN has attracted much intention in the field of optoelectronics including light-emitting diodes (LEDs), laser diodes (LDs) and photodetectors. Commercially, GaN-based optoelectronic devices are grown along c-plane direction. However, c-oriented GaN-based optoelectronics suffer from piezoelectric polarization, which hinders the device performances. Conversely, semi-polar (11-22) GaN exhibits almost zero piezoelectric polarization effect. Furthermore, as the GaN wurtzite lattice is inclined approximately 58° respective to c-plane, it provides more sites for doping incorporation such as indium, silicon, aluminium, etc. Therefore, the semi-polar (11-22) GaN is presumed to be one of a promising candidate for efficient …
Synthesis And Characterization Of Hybrid Organic Coating System To Reduce Thermal Degradation Of Solar Cells, Mohd Zaini Farah Khaleda
Synthesis And Characterization Of Hybrid Organic Coating System To Reduce Thermal Degradation Of Solar Cells, Mohd Zaini Farah Khaleda
Student Works (2020-2029)
Thermal-decreasing hybrid organic coatings were developed for crystalline solar cells by using two types of binder systems; namely Aminopropyltriethoxysolution (APTES) / Methyltrimethoxysilane (MTMS) binder system (labelled as B1) and Methyltrimethoxysilane (MTMS) / nitric acid (HNO3) binder system (labelled as B2). Three types of nanoparticles; Titanium dioxide, TiO2 (Anatase), Zinc oxide, ZnO and Tin dioxide, SnO2 nanoparticles with different weight percentage were introduced inside each binder system namely; 20 wt%, TiO2 (T1B1 coating), 60 wt% TiO2 (T2B1 coating), 20 wt% ZnO (Z1B1 coating), 60 wt% ZnO (T2B1 coating), 20 wt% SnO2 (S1B1 coating) and 60 wt% SnO2 (S2B1 coating) for B1 …
Effect Of Non-Thermal Atmospheric Pressure Plasma On Wound Bacteria And Cell Proliferation, Mohd Nasir Norhayati
Effect Of Non-Thermal Atmospheric Pressure Plasma On Wound Bacteria And Cell Proliferation, Mohd Nasir Norhayati
Student Works (2020-2029)
Non-thermal plasma produced in the plasma jet at atmospheric pressure consists of many reactive species and free radicals. The use of the atmospheric plasma jet has been expanded from surface treatment on polymers and biomaterials to the application as plasma medicine. It has been studied as a tools for wound sterilizations, enhance wound healing, topical treatment of skin diseases caused by bacteria infection and cancer therapy in recent research. The current study aims to investigate the effect of plasma on chronic wound bacteria as a supplementary to wound management particularly for compromised patients. The common practice in wound management is …
The Thermoluminescence Properties Of Manganese Doped Zns Nanophosphor, Khalid Humaid Zahir Al-Hinai
The Thermoluminescence Properties Of Manganese Doped Zns Nanophosphor, Khalid Humaid Zahir Al-Hinai
Student Works (2010-2019)
The thermoluminescence (TL) properties of Manganese (Mn) doped ZnS nanophosphors were investigated after gamma irradiation at room temperature. The ZnS:Mn nanophosphors were prepared by chemical precipitation method by using Zinc sulfate, Sodium sulfide and Manganese sulfate. 1 mole, 2 moles and 3 moles of Manganese sulfate were used to have different concentrations of Mn in doped ZnS. The formation of the nanophosphors was characterized by high resolution scanning electron microscopy FESEM, XRD and EDX. The obtained products consist of particles with the dimension about 85–150nm. Comparison between ZnS nanophosphors and commercial ZnS powder glow curves was studied. It was observed …
Automated Waveguide Alignment And Direct Uv Writing Systems For Integrated Optical Devices Fabrication And Characterization., Tan Chin Chong
Automated Waveguide Alignment And Direct Uv Writing Systems For Integrated Optical Devices Fabrication And Characterization., Tan Chin Chong
Student Works (2010-2019)
This dissertation reports the studies on the development of waveguide alignment techniques as well as the UV writing coding structures for optical circuitries through a programming platform, LabVIEW. In the first part of the work, 1-by-4 silica splitter was pigtailed with a single mode fiber which placed on a stepper motorized stage. The developed alignment techniques are image analysis for waveguide alignment, initial light seeking from interference fringes, manual alignment of launch fiber for waveguide’s input, and peak power detection. These waveguide alignment techniques covered from the search of input channel within waveguide to the performance test. While, in the …
Digital Holography And Application In Laser Metrology, Thian Khok Yong
Digital Holography And Application In Laser Metrology, Thian Khok Yong
Student Works (2000-2009)
A digital holography system has been developed in this study. The object is recorded and the hologram is stored electronically with a charged-couple-device (CCD) camera without any focusing optics. The reconstruction of the digitally sampled hologram is done numerically with a computer. The algorithm and software for numerical reconstruction, which consists in a numerical realization of the Fresnel-Kirchhoff diffraction integral, are designed and implemented with twodimensional and three-dimensional simple objects. The characteristics of the system have been studied. For the CCD camera (768x494 pixels) been used with spatial resolution of about I 00 lines/mm, the angle between reference and object …
Erbium-Ytterbium Codoped Fiber Amplifiers, Wai Yee Chan
Erbium-Ytterbium Codoped Fiber Amplifiers, Wai Yee Chan
Student Works (2000-2009)
The amplification characteristics of an Erbium/Ytterbium codoped fiber amplifier(EYDFA) pumped in both the 800nm and 980nm pump bands is reported. With -3m long Er-Yb fiber, the 813nm pumped-EYDFA shows small-signal gain exceeding 20dB over a 20nm bandwidth in the l.Sµm region where the peak gain of 38.4dB is achieved at 1535nm. A low noise figure of ~3.6d8 is also achieved at 1550nm. However, it is found that 980nm pumpedEYDF A suffers lower gain due to the effect of nonsaturable absorption by Yb³⁺ ions which causes high pump poWer loss, thus degrades the signal amplification in Er³⁺ system. Compared to the …