Pusat Pengajian Sains Fizik - Tesis

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Sifat-Sifat Optik Filem Nipis Germanium Amorfus Tersejat
(1993-03)
Saw Kim Guan
Filem nipis germanium amorfus dimendapkan pada kaca borosilikat melalui penyejatan vakum. Kesan ketebalan filem ke atas jurang optik, Eg, filem a-Ge yang dimendapkan pada suhu bilik dengan kadar cepat dan lambat dikaji dan dibandingkan.
SNESS - An Expert System Shell
(1994-05)
Singh, Pratul
Looking at the prevailing trend, an attempt has been made in this thesis to develop a shell on PC, using C++ language. C++ language is an extension of C language and it retains the efficiency of C and is compatible with existing C programs. In the present work we have emphasized on the core of an expert system shell which consists of a facility to input knowledge and create a knowledge base and an inference engine that operates on the knowledge base to develop the desired system.
Fabrication And Characterization Of Normoxic Polymer Gel Dosimeter By Using Raman Spectroscopy At Low X-Ray Energies
(2012-12)
Aifa Aflrah Binti Rozlan
Polymer gel dosimeters are fabricated from radiation sensitive chemicals which, upon irradiation, polymerize as a function of the absorbed radiation dose. Two types of normoxic polymer gel dosimeters were fabricated, which is PHEAG (polyhydroxyethyl acrylate) and PHEMAG (polyhydroxyethyl methacrylate) gel dosimeters. These polymer were fabricated by using gelatin, N' N-methylene-bisacrylamide (BIS), ascorbic acid (AA), deionized water and 2-hydroxyethyl acrylate (HEA) for PHEAG and 2-hydroxyethyl methacrylate for PHEMAG. The ability of AA to bind oxygen in the gel solution was investigated by using an oxygen dissolve meter. The concentrations of AA used are 5, 10, 15 and 35 mM and each concentration was applied to each batch of PHEAG and PHEMAG. The sensitivity of PHEAG and PHEMAG towards low X-ray energy was investigated. The structural changes of the monomeric components in PHEAG and PHEMAG after irradiation were analyzed using Raman spectroscopy.
Slow Pyrolysis Of Palm Wastes And Properties Of Biochar Blended Coal Briquettes
(2014-01)
Inuwa, Ibrahim Abdullahi
The disposal of large amount of agricultural residues in developing countries causes a detrimental effect to the environment. Thus, this study is aimed at converting oil palm wastes from oil palm mill, into briquettes to significantly reduce the consequences following the existing disposal system. In this study, pyrolysis experiments were conducted from 300°C to 700 °C with heating rate between 5°C/min to 30°C/min by a lab-scale pyrolysis system. The results obtained showed, the quantity and quality of products mostly depend on the pyrolysis parameters (temperature and heating rate). The calorific value and carbon content of PKS biochar were 28.27 MJ/kg and 72.42%, which is significantly greater than that of coal sample of 26.21 MJ/kg and 64.66%. While moisture and ash content in biochar is 1.02 mfwt% and 4.88 mfwt which is lower than that of coal with 7.40 mfwt% and 6.62 mfwt% respectively. The composite PKS biochar and pure coal (bituminous) are mixed with percentage compositions of 100:0,80:20, 70:30, 60:40, 50:50, 60:40, 70:30 and O: 100 respectively. A different proportion of2, 2.5, 3, 3.5 and 4% cassava starch for the total mass of the mixture were used as the binder. The different compressed pressure of 80, 90,100, 110 and 120 kg/cm2 at 2 dwell times was used. Among the briquettes samples tested p 100 contained lowest moisture of 2.56 mfwt% and ash of 5.36 mfwt% with highest fixed carbon of 54.49 wt %. The increase in pure coal into the blend has led to a reduction in the energy value of the briquette from 29.83 to 25.55 MJkg-l. Cassava used as binder portrayed an insignificant effect in the calorific values of the briquettes. In the water boiling test analysis showed, pure biochar briquette PIOO generates the highest temperature up to 920.67°C compared to biochar-coal mixture briquettes and pure coal sample.
Fabrication And Characterization Of Tio2 - Pvp Nanofibre Using Electrospinning Method For Hydrogen Gas Sensing
(2016-08)
Abed, Nabeel Zabar
In this project, anatase phase titanium dioxide (TiO2) nanofibers (NFs) are successfully fabricated using the homemade electrospinning (ES) method. This study aims to fabricate uniform and high quality anatase TiO2/polyvinylpyrrolidone (PVP) NFs on the glass substrate. A number of parameters were studied for the development of best form of nanofibers; the most suitable/optimised parameters for the fabrication of hydrogen gas sensor device were found at room temperature. Xray diffraction (XRD) patterns show sharp and well-defined peaks identified as anatase phase. Field emission scanning electron microscope (FESEM) images revealing the formation of nanofibers are investigated. Surface topography observations by atom force microscopy (AFM) indicate that the roughness is improved by effect of the parameters selected and optical properties were measured using ultraviolet-visible-near infrared (UV-Vis-NIR.) spectrometer.
Reduction Of Backscattered Radiation For X-Ray Image Quality Enhancement
(2016-12)
Qaed Naji, Abdullah Taher
This study mainly aims to reduce backscattered radiation inside an X-ray room. The characteristics of X-ray attenuation in several materials such as lead, copper, iron steel, aluminium, and concrete have been investigated under different exposure parameters to measure their abilities to attenuate incident X-ray and to reduce backscattered X-ray. Lead and Iron presented good attenuation values for incident X-ray at radiographic diagnosis energy range (50 -110 kVp), whereas iron and aluminium reflected the least amount of backscattered radiation dose. A number of anti-scatter grids have been designed and fabricated from iron steel and aluminium, because of their relatively better abilities to reduce backscattered radiation compared to other materials.
Growth Of Zno Nanorods On Wire Via Sonochemistry Method For Glucose Sensing
(2017-02)
Rayathulhan, Ruzaina
There has been much research on growth of ZnO nanorods on vanous substrates, and various growth methods. Sonochemical method is a well-known method for growing nanorods. Metal wire is a suitable substrate for the growth of ZnO nanorods as it can then be used as sensor electrode for sensing application. However there has not been any report on growth of ZnO nanorods on metal wire directly using sonochemical method. ZnO nanorods were directly grown on four different wires (silver (Ag), nickel (Ni), copper (Cu), and tungsten (W)) through sonochemical method and the best sample was chosen as electrode and tested for glucose sensing. Zinc nitrate hexahydrate and hexamethylenetetramine (HMT) were used as precursors for the growth of ZnO nanorods. The optimum condition for the growth of ZnO nanorods were determined by varying precursor molarity, sonication time and molar ratio of precursor solution.
Delineation Of Seulimeum Fault System And Identification Of Geothermal Signatures Using Ground Magnetic And 2-D Resistivity Imaging Methods
(2017-02)
February 2017
Ground magnetic and 2-D resistivity imaging method are widely used in geophysical exploration for subsurface identification to study the earth rheology such as fault process based on the geophysical parameter. Ground magnetic and 2-D resistivity imaging surveys were conducted to investigate the trend of Seulimeum fault system and the signature of potential geothermal surface manifestation resulting from the fault. Four different sites, namely Krueng Raya, Iejue, Lamtamot, and Tangse were chosen as study area for Seulimeum fault study while two sites; lejue and Ie-Seu 'Urn were chosen as case study areas in identifying the geothermal signatures. Ground magnetic method was performed using proton magnetometer while the 2-D resistivity imaging survey was done using ABEM Terrameter with Pole-dipole array. The magnetic residual contour map in Krueng Raya locality shows the dislocation from northwest to southeast (NW-SE) direction with contrast of high and low magnetic residual ranging from -150 nT to 300 nT which interpreted as the geological fault. In Iejue site the result shows the contrast of magnetic residual between -150 nT to 300 nT which indicate as geological fault continuous from Krueng Raya.
The Biostimulation Of Low Level Laser Irradiation On Blood Parameters: Ex Vivo
(2017-07)
Al Musawi, Mustafa Salih Ali
Various low-level laser wavelengths have been used for a variety of clinical applications because of their ability to modulate blood rheology and improve microcirculation. The response of human blood to low-level laser irradiation (LLLI) provides important information about the interactions of laser light with living tissues. This study was designed to investigate whether in vitro LLLI changes the erythrocyte sedimentation rate (ESR) and other blood indices of whole blood. Blood samples were collected by venipuncture into ethylenediaminetetraacetic acid (EDTA)-containing tubes. Each sample was divided into two equal aliquots as a control (non-irradiated) and irradiated samples. The irradiated sample was subjected to LLLI doses of 36, 54, 72 and 90 J/cm2 at wavelengths of 405, 589 and 780 nm.
Enhanced Led Thermal Conductivity Of Filled Epoxy Resin Containing Multimodal Distribution Of Ceramic Particles And Graphene Sheets
(2018-07)
Permal, Anithambigai
Present work was designed to investigate the class of possible materials to be compounded as thermally conductive composite as well as to be catered as thermal interface material (TIM) for an improved thermal performance of a high power light emitting diode (LED) headlamp, a product of OSRAM Opto Semiconductors. This research was earned out to produce a closely packed ceramic and graphene filled hybrid epoxy composite. The work was earned out by understanding the physical and chemical behaviour of aluminium nitride (AIN), boron nitride (BN) and aluminium oxide (AI2O3). Also a comparison of compatibility between two commercial epoxy matrices has been presented in this work. The thermal conductivity of unimodal AIN, bimodal A1N/BN and bimodal AI2O3 were investigated.
Simulation And Performance Studies Of Thermally Efficient Light Emitting Diodes Drivers
(2018-09)
Mohd Supian, Norazlina
The thermal behaviour of an electronic package is often characterized by evaluating the junction temperature and thermal resistance at the junction of a single or multiple heat source to ambient. In the case of IC LED drivers, the heat source within the device is either single or multiple due to presence of many integrated component such as transistor, internal resistor, etc on a single die. Hence the evaluation of IC drivers with single or multiple heat sources is absolutely necessary for imparting suitable thermal management within the device. In this study, thermal transient measurement method and computational fluid dynamics (CFD) simulations have been used to measure thermal resistance and junction temperature.
Optically Pumped Lasing Properties Of ZnO Nanorods
(2018-11)
Nordin, Muhammad Nuri
The purpose of this study is to investigate the characteristics of optically pumped laser from the ZnO nanorods grown by using the two-step chemical bath deposition (CBD). Samples are grown on two types of substrates, glass and sapphire wafer, AI2O3. Various conditions and treatments of the samples have been introduced to observe the optical emission mainly by manipulating the thickness of ZnO seed layer thin film and the heat treatment condition. The procedures for CBD process is fixed for four hours at 97“C for growth process with the solutions of 0.05 M of zinc nitrate (Zn(NO.3)2.6H2O) and 0.05 M of hexamethylenetetramine (11 MT).
Assessment Of Uranium, Lead, Cadmium And Iron In Maternal And Umbilical Cord Blood Samples In Iraq
(2019-03)
Hasan Rhaif Al-Sahlanee, Mayyadah
The assay of blood samples is a preferred method for monitoring the internal exposure of radiological and toxicological contaminants in human body. The objectives of this study were to evaluate the status of uranium (U) radioactivity and selected heavy metals such as lead (Pb), cadmium (Cd) and iron (Fe) in maternal and umbilical cord blood samples for normal and deformed infants in Iraq, and the influence of these elements to the foetus development and to identify predictors of maternal exposure. Additionally, to assess the interactions between these elements in the maternal and umbilical cord blood samples. A cross-sectional study was conducted in three public hospitals (Al-Yarmouk Teaching Hospital, Al-Basrah Maternity and Children Hospital and Al-Shatra Maternity Hospital).
The Growth Of GaN-Based Low Dimensional Structures By CVD Using Platinum And Palladium Catalysts
(2019-03)
Tan, Lay Kim
This research project presents the growth of low dimensional GaN structures employing monometallic catalyst (Pt and Pd) and bimetallic catalysts (Pd/Pt) by means of chemical vapor deposition based on vapor-liquid-solid mechanism.
Development Of A Digital Camera-Based Spectrometer For Led Spectrum Analysis
(2019-04)
Teo, Choon Kiat
Charge-Coupled Device (CCD) spectrometer instrument has been widely used in many applications such as photonics research, opto-semiconductor test and measurement, colour imaging science, and many more. The great function of this instrument is the capability of providing essential information about the properties of light which sensed by the instrument CCD sensor.
Study Of Biostimulation Effect On Normal And Anaemic Human Blood Cell Irradiated By 589 nm And 532 nm Laser
(2019-04)
Fauzi, Nabihah
Laser (light amplification by stimulated emission of radiation) is a monochromatic light. It has been widely used in various fields including in the field of medicine. Application of Low Level Laser (LLL) at low output power (1-500 mW) has been proven to have therapeutic or biostimulation effects on biological tissues or cells. Widespread applications of LLL in medical practices including blood irradiation have resulted in the investigations on the bio-stimulation effects on irradiated human red blood cell (RBC). In this study, full blood count was measured on normal and anaemic human blood, the morphology of RBC were compared and the adenosine 5’-triphosphate (ATP) values were analysed.
Characterization Of Multilayer ZnO/METAL/ZnO As pH Sensor
(2019-07)
Rasheed, Hiba Saad
This study focused on the synthesis and characterisation of ZnO/metal/ZnO multilayer thin films for extended gate field effect transistors in pH sensor devices by using a physical method. Multilayer structures ZnO/metal/ZnO and ZnO single layer were deposited on glass substrate via radio frequency and direct current magnetron sputtering.
Local Land Subsidence Analysisi In Penang Island (Malaysia) Based On Insar Maps
(2021-11)
Gao Guosheng
Penang Island is an important economic centre in Malaysia that has experienced land subsidence in recent years. In this study, the PS-InSAR and SBAS-InSAR techniques are used to monitor land subsidence of Penang Island based on Sentinel-1 SAR radar images in both ascending and descending tracks.
Characterization Of 2-Dimensional Electrical Resistivity Tomography, Geotechnical And Hydraulic Conductivity Analysis In The Granitic Residual Soil
(2021-12)
Oladunjoye Peter Olabode
This research aims to characterise 2-D Electrical Resistivity Tomography (ERT) models for changes in soil saturation, analyse geotechnical properties of residual soil for validation of ERT models and develop a relationship between soil resistivity and Hydraulic Conductivity (HC) for lithological characterisation for slope instability assessment.
Study Of Titanium Dioxide Nanotubes And Nanoparticles For Ultraviolet Photodetection Application
(2021-12)
Low Kai Ti

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