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2013

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Chemically Modified Carbon Nanotubes (Cnts) For Adsorption Of Mercury / Nuruzatulifah Bt Asari @ Mansor, Nuruzatulifah Asari @ Mansor Jan 2013

Chemically Modified Carbon Nanotubes (Cnts) For Adsorption Of Mercury / Nuruzatulifah Bt Asari @ Mansor, Nuruzatulifah Asari @ Mansor

Student Works (2010-2019)

Functionalized multiwalled carbon nanotubes (MWCNTs) for the removal of mercury ion from aqueous solution were studied. This project had two parts, first part was the functionalization of MWCNTs using different method. Second, the performance study of the removal mercury ion using functionalized MWCNTs. Functionalization of MWCNTs was carried out using two separate methods. The first method was a gas phase treatment in a Universal Temperature Program (UTP) reactor by flowing H2SO4/SO3 vapour onto the MWCNTs. The second method was a liquid phase treatment which includes refluxing the MWCNTs in H2SO4. All samples were heated at different temperatures (100, 200, 300 …

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Selection, Characterization And Evaluation Of Streptomyces For The Control Of Anthracnose In Chilli / Pedram Shahbazi, Pedram Shahbazi Jan 2013

Selection, Characterization And Evaluation Of Streptomyces For The Control Of Anthracnose In Chilli / Pedram Shahbazi, Pedram Shahbazi

Student Works (2010-2019)

The actinomycetes, mainly Streptomyces spp., have been widely studied as potential biocontrol agents against plant pathogenic fungi. This project was undertaken to isolate and select Streptomyces strains showing potential in vitro and in vivo antifungal activity. Isolation was done from rhizosphere-derived soil of healthy and Colletotrichum-infested chilli plants in Ulu Chechuh in Kuala Selangor and Sungai Burung in the state of Selangor, Malaysia. The selected strains were evaluated for their ability to control chilli anthracnose pathogen, Colletotrichum spp. in vitro, and the best strain among them was chosen for green house experimental trials on chilli in vivo. A total of …

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Study Of Laser Interactions With Quantum Particles / Tan Kai Shuen, Kai Shuen Tan Jan 2013

Study Of Laser Interactions With Quantum Particles / Tan Kai Shuen, Kai Shuen Tan

Student Works (2010-2019)

In this research, we consider the interaction between an atomic or molecular quantum system (QS) and a metallic nanoparticle (MP). We modelled QS by a three-level lambda system. Under the probe field and control field, the QS become transparent to incident light within a narrow spectrum of frequency, a phenomena known as electro- magnetically induced transparency (EIT). The quantum coherence of the QS under EIT and the strong exciton-plasmon coupling between the QS and MP are dependant on each other. The analytical expressions for the interaction of QS and MP are derived using two methods. First, the QS-MP system is …

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Studies Of Pmma-(Mgcf3so3)2 Gel Polymer Electrolytes For Magnesium Battery Applications / Nurul Husna Binti Zainol, Nurul Husna Zainol Jan 2013

Studies Of Pmma-(Mgcf3so3)2 Gel Polymer Electrolytes For Magnesium Battery Applications / Nurul Husna Binti Zainol, Nurul Husna Zainol

Student Works (2010-2019)

In the present work, the gel polymer electrolytes (GPEs) comprising of poly(methyl methacrylate) (PMMA) as a host polymer in a mixture of ethylene carbonate (EC) and propylene carbonate (PC) as a plasticizing solvent with various concentrations of magnesium triflate as a dopant salt have been prepared by the solution casting technique. The ionic conductivity of the GPE films was determined using AC impedance spectroscopy. The film containing 20 wt.% of magnesium triflate salt exhibited the highest room temperature ionic conductivity of 1.27 × 10-3 S cm-1. The conductivity-temperature studies of the GPE films follow the Arrhenius behavior with activation energy …

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Surface Polariton With Arbitrary Dielectric And Magnetic Materials / Low Ka Chun, Ka Chun Low Jan 2013

Surface Polariton With Arbitrary Dielectric And Magnetic Materials / Low Ka Chun, Ka Chun Low

Student Works (2010-2019)

Surface Polariton dispersion is demonstrated in the interface of two mediums and thin slab. Starting from 4 Maxwell equations, dispersion equations for s-polarization and p-polarisation are derived. Solutions of the tangential dispersion relation and normal dispersion relation for s-polarization is completely symmetrical to that of the p-polarization, due to the symmetry between the electric and magnetic responses in the Maxwell equations. If the materials are both dielectric and magnetic, mi ; ei 6=1, the s-polarized light can also excite the propagating surface modes, not just the p-polarized light. Analysis reveals additional new regimes of surface polariton resonances with magnetic materials …

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Preparation And Characterization Of Inclusion Complexes Of Β-Cyclodextrin With 1-Butyl-3-Methylimidazolium Tetrafluoroborate ([Bmim][Bf4])Ionic Liquid / Norashikin Bt Othman, Norashikin Othman Jan 2013

Preparation And Characterization Of Inclusion Complexes Of Β-Cyclodextrin With 1-Butyl-3-Methylimidazolium Tetrafluoroborate ([Bmim][Bf4])Ionic Liquid / Norashikin Bt Othman, Norashikin Othman

Student Works (2010-2019)

The interaction between β-cyclodextrin and ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]) had been studied. The inclusion complexation interaction was confirmed by FT-IR spectra. The inclusion complex was also characterized by 1H NMR, TGA and DSC. The results showed that the host-guest system presented a channel type structure and each glucose unit of β-cyclodextrin was in similar environment. The decomposition temperature of inclusion complex was lower than that of [bmim][BF4] and β- cyclodextrin individually. The ratio of 1:1 inclusion complex was determined in this study.

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Synthesis Of Functionalized Graphene/Copper Oxide (Cuo) Nanocomposites And Their Catalytic Activity / Norazriena Binti Yusoff, Norazriena Yusoff Jan 2013

Synthesis Of Functionalized Graphene/Copper Oxide (Cuo) Nanocomposites And Their Catalytic Activity / Norazriena Binti Yusoff, Norazriena Yusoff

Student Works (2010-2019)

Graphene sheets incorporated with inorganic metal oxides are emerging as a new class of exciting materials. Nanostructured CuO-based materials have been widely investigated because they are inexpensive, non-toxic, and have unique features such as narrow band gap and high solar absorbency. The focus of this research is to fabricate and characterize copper oxide (CuO) nanostructures, functionalized graphene oxide (FGO) and functionalized graphene/copper oxide (FG/CuO) nanocomposite as well as a study of their catalytic activity. Such a study is important in order to predict the suitability of the FG/CuO nanocomposite as a catalyst for the treatment of wastewater contained dyes. Firstly, …

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Creative Adoption Of Ms Excel In Teaching And Learning Of Chemistry In Malaysia / Lee Sui Chin, Sui Chin Lee Jan 2013

Creative Adoption Of Ms Excel In Teaching And Learning Of Chemistry In Malaysia / Lee Sui Chin, Sui Chin Lee

Student Works (2010-2019)

This study concerns the creative use of MS Excel in teaching and learning chemistry in Malaysian secondary schools and universities. It is used to explain, explore and understand chemical concepts. Topics such as chemical kinetics, gas compressibility, distribution of molecular speed, period three elements, qualitative analysis, spectroscopy and chemical equilibrium were chosen from Form Six and first/second year university syllabus as examples. For the “qualitative analysis” workbook, a set of videos showing the reactions described are also provided to give the ‘intuitive feel’ of the experiments described in the worksheets. Simple functions in Excel such as ‘Active X’ control tool …

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Some Outlier Problems In A Circular Regression Model / Safwati Binti Ibrahim, Safwati Ibrahim Jan 2013

Some Outlier Problems In A Circular Regression Model / Safwati Binti Ibrahim, Safwati Ibrahim

Student Works (2010-2019)

This study looks at three problems related to the JS circular regression model with five objectives in mind. The first two objectives are concerned with the problem of outliers in the model. The first is the investigation of the robustness of the JS circular regression estimation method in the presence of outliers in the data set. The second is the use of three numerical tests based on row deletion approach to detect possible outliers in the JS circular regression model. The first test considered is a modified version of the COVRATIO statistic by utilizing the covariance matrix of residuals of …

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Optical Properties And Mathematical Model For Water Based Alumina And Titania Nanofluids / Mohammad Sajid Hossain, Mohammad Sajid Hossain Jan 2013

Optical Properties And Mathematical Model For Water Based Alumina And Titania Nanofluids / Mohammad Sajid Hossain, Mohammad Sajid Hossain

Student Works (2010-2019)

The purpose of this research is to experimentally investigate optical behaviour of Alumina and Titania nanofluids. Effects of aggregation on optical properties along with development of a mathematical model for extinction coefficient have also been done. In this dissertation, Classical theories such as, Rayleigh, Quasi Crystalline, Maxwell-Garnett and Lambert-Beer’s approaches are used for analytical analysis. Experiment is conducted for 0.03, 0.05 and 0.08 %v/v concentrations at different time intervals. Outcome of the dependencies are then combined together to obtain a realistic mathematical model for measurement of extinction coefficient. Results of the study show that Alumina nanofluids are very stable for …

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Optical Properties And Mathematical Model For Water Based Alumina & Titania Nanofluids / Mohammad Sajid Hossain, Mohammad Sajid Hossain Jan 2013

Optical Properties And Mathematical Model For Water Based Alumina & Titania Nanofluids / Mohammad Sajid Hossain, Mohammad Sajid Hossain

Student Works (2010-2019)

The purpose of this research is to experimentally investigate optical behaviour of Alumina and Titania nanofluids. Effects of aggregation on optical properties along with development of a mathematical model for extinction coefficient have also been done. In this dissertation, Classical theories such as, Rayleigh, Quasi Crystalline, Maxwell-Garnett and Lambert-Beer’s approaches are used for analytical analysis. Experiment is conducted for 0.03, 0.05 and 0.08 %v/v concentrations at different time intervals. Outcome of the dependencies are then combined together to obtain a realistic mathematical model for measurement of extinction coefficient. Results of the study show that Alumina nanofluids are very stable for …

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Ionic Conductivity And Related Studies Of Polymer Electrolytes Based On Poly(E-Caprolactone) / Woo Haw Jiunn, Haw Jiunn Woo Jan 2013

Ionic Conductivity And Related Studies Of Polymer Electrolytes Based On Poly(E-Caprolactone) / Woo Haw Jiunn, Haw Jiunn Woo

Student Works (2010-2019)

Poly(E-caprolactone) (PCL)-based polymer electrolytes (PE) were prepared by solution casting. PCL has excellent properties of biocompatibility and biodegradability leading to wide applications in the biomedical field. In this work, PCL was used as a polymer host to reduce environmental impact. Ammonium thiocyanate (NH4SCN) salt was incorporated as the source of charge carriers. Ethylene carbonate (EC) was added as the chain lubricant to enhance ionic conductivity of the PE system. Two systems (PCLNH4SCN and PCL-NH4SCN-EC) were prepared and characterized by using differential scanning calorimetry (DSC), scanning electron microscope (SEM), x-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and electrochemical impedance spectroscopy …

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Quorum Sensing And Quorum Quenching Abilities Of Selected Bacteria Isolated From Antarctic / See-Too Wah Seng, Wah Seng See-Too Jan 2013

Quorum Sensing And Quorum Quenching Abilities Of Selected Bacteria Isolated From Antarctic / See-Too Wah Seng, Wah Seng See-Too

Student Works (2010-2019)

Quorum sensing (QS) is a phenomenon which refers to bacterial cell-to-cell communication in a population manner. QS regulates diverse activities in bacteria. Bacteria that possess QS activity communicate through secreted signal molecules or autoinducer. The Gram-negative bacteria and archaeon use acyl homoserine lactones (AHLs) as a QS signal to achieve regulation through the luxI-luxR homolog system, wheareas Gram-positive bacteria use small peptides as autoinducers. Some of the Proteobacteria use quinolone compound as signaling molecules. Quorum quenching (QQ) on the other hand refers to interference of QS that inactivates the signaling molecules. Even though QS and QQ were extensively studied in …

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The Use Of On-Line Analytical Processing Approach In Developing Host-Parasite Database System / Nur Imtiazah Bt. Shuhaimi, Shuhaimi Nur Imtiazah Jan 2013

The Use Of On-Line Analytical Processing Approach In Developing Host-Parasite Database System / Nur Imtiazah Bt. Shuhaimi, Shuhaimi Nur Imtiazah

Student Works (2010-2019)

Biodiversity is a very broad area to explore. The developments of research have resulted in increasing the number of biodiversity data in various formats. The ability of a database in dealing with biodiversity data is essential for the effective management and information dissemination process. The capabilities of a database system rely on the formula or approaches used in operating the system. The development of On-Line Analytical Processing (OLAP) technology from time to time expands the use of this approach which previously was dominated by the business field. The effectiveness of structuring data into cube form technique allows data modeling and …

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Pvdf-Hfp Plasticized Polymer Electrolytes For Application In Dye Sensitized Solar Cells / Mazni Binti Mohd Noor, Mazni Mohd Noor Jan 2013

Pvdf-Hfp Plasticized Polymer Electrolytes For Application In Dye Sensitized Solar Cells / Mazni Binti Mohd Noor, Mazni Mohd Noor

Student Works (2010-2019)

In this work, plasticized poly (vinylidene fluoride-co-hexafluoropropylene) or PVDF-HFP polymer electrolytes have been prepared by solution casting and optimized for the fabrication of dye sensitized solar cells (DSSCs). Potassium iodide (KI) and sodium iodide (NaI) salts have been chosen as the ion sources. A mixture of 1:1 weight ratio of ethylene carbonate (EC) and propylene carbonate (PC) forms the plasticizing agent. The complexation between polymer and salt and interaction between salt and the plasticizer have been verified using Fourier transform infrared (FTIR) spectroscopy. The structural characterization was performed using X-ray diffraction (XRD) and electrical and transport properties by electrochemical impedance …

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Controlling The Casimir Force / Khoo Yee Yang, Yee Yang Khoo Jan 2013

Controlling The Casimir Force / Khoo Yee Yang, Yee Yang Khoo

Student Works (2010-2019)

This research is devoted to a detailed study of the Casimir effect, and means to control it. The study is subdivided into two objectives. First, the origin of Casimir force and its physical significance is explored. Several different approaches and interpretations of the Casimir force is detailed and discussed. In particular, the Casimir force was derived from the vacuum field approach, the vacuum radiation approach and the source theory approach. It is concluded that the Casimir force may be equally interpreted as the manifestation of vacuum field, or the source field. Second, the possible means of controlling the Casimir force …

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Quantum Entanglement Criteria / Aini Syahida Binti Sumairi, Aini Syahida Sumairi Jan 2013

Quantum Entanglement Criteria / Aini Syahida Binti Sumairi, Aini Syahida Sumairi

Student Works (2010-2019)

Entanglement of quantum is a quantum phenomenon which cannot be described using classical physics. This study reviews the quantum entanglement which discusses the various methods which are used to detect the entanglement. The properties of entanglement in the quantum system have been determined through the theoretical analysis of the quantities of nonclassical measure. That leads to the estimation of quantum entanglement with different parameters conditions. The study of the features and the nature of quantum entanglement enhance our understanding of the nature of entanglement processes. Furthermore, the entanglement is useful in the field of information processing where the entanglement is …

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Stability And Rheological Behaviour Of Functional Essential Oils In Glycolipid Cream Emulsion / Saw Mei Mei, Mei Mei Saw Jan 2013

Stability And Rheological Behaviour Of Functional Essential Oils In Glycolipid Cream Emulsion / Saw Mei Mei, Mei Mei Saw

Student Works (2010-2019)

Essential oils carries distinctively unique aroma from parts of a plant where they are extracted. Essential oils have widely been known for its aromatherapy and therapeutic effect on human. High concentration of essential oil comprises of thyme, lavender, tea tree and citronella oil have been induced in emulsions system using olive oil as carrier oil stabilized by glycolipid surfactants of sucrose stearate, surcrose palmitate and sucrose myristate respectively. Co-surfactants, TritonTM X-100 and TritonTM X-45 was utilised to create high interactions and compatibility associated with short chain terpenes, terpenoids and phenolic compound presents in essential oils inverting emulsion droplet forming o/w …

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Development Of Environmental Safety And Health Conceptual Model For Steel Factory / Nur Shuhada Bt. Mohamed Jaafar, Mohamed Jaafar Nur Shuhada Jan 2013

Development Of Environmental Safety And Health Conceptual Model For Steel Factory / Nur Shuhada Bt. Mohamed Jaafar, Mohamed Jaafar Nur Shuhada

Student Works (2010-2019)

Since modernization and industrialization have led to human loss and tragedies, due to industrial accidents all over the world, it is significant to look at the aspects that lead to success of environmental safety and health (ESH) situation. The safety statistics indicate high fatality and injury rates among the manufacturing employees. This paper focuses on developing an ESH Conceptual Model, based on related recommended OSHMS models in the existing of OHSAS: 18001 Standard and Guidelines. Besides, the effectiveness of OSHMS implementation was evaluated, by identifying the potential hazards and practical methods in minimizing workplace accidents. A case study has been …

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Influence Of Allium Sativum Or Cinnamomum Verum On Fermentation Of Milk And Their Effects On The Physicochemical, Biochemical, Microbiological And Functional Properties Of Probiotic Yogurt / Shori, Amal Bakr, Amal Bakr Shori Jan 2013

Influence Of Allium Sativum Or Cinnamomum Verum On Fermentation Of Milk And Their Effects On The Physicochemical, Biochemical, Microbiological And Functional Properties Of Probiotic Yogurt / Shori, Amal Bakr, Amal Bakr Shori

Student Works (2010-2019)

The present study investigated the effects of Allium sativum or Cinnamomum verum water extract on fermentation of milk and subsequent changes in yogurt bacteria growth and fermentation products on the organoleptic, nutritional and functional values of yogurt. Three types of milk (cow, camel and goat) were incubated (41°C) with starter culture in the presence of A. sativum or C. verum water extract until pH of yogurt was reduced to 4.5. The presence of A. sativum or C. verum water extract in cow, camel and goat milk did not affect pH reduction during fermentation whereas titratable acidity (TA) increased only in …

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Nonlinear Optical Interaction In Photonic Structures / Lee Choo Yong, Choo Yong Lee Jan 2013

Nonlinear Optical Interaction In Photonic Structures / Lee Choo Yong, Choo Yong Lee

Student Works (2010-2019)

In this thesis, we investigate second harmonic generation (SHG) in nonlinear 1 dimensional (1D) bilayer periodic photonic crystal with various microstructure designs. The transfer matrix is used to model propagation of fundamental field (FF) and second harmonic field inside photonic crystal and numerical simulations are studied. Firstly, we investigate SHG caused by interaction between continuous wave and dielectric magnetic photonic crystal. For nondispersive material, constant and real permittivity and permeability are used being good approximation for frequency far away from the resonant region. We find interesting features in the SH fields versus pump frequency and relative thickness of the bilayers …

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Chemical Constituents And Bioactivity Of Mitrella Kentii (Bl.) Miq. (Annonaceae) / Ainnul Hamidah Syahadah Binti Azizan, Ainnul Hamidah Syahadah Azizan Jan 2013

Chemical Constituents And Bioactivity Of Mitrella Kentii (Bl.) Miq. (Annonaceae) / Ainnul Hamidah Syahadah Binti Azizan, Ainnul Hamidah Syahadah Azizan

Student Works (2010-2019)

The phytochemical and bioactivity studies on Mitrella kentii species from Annonaceae family have been performed. The extraction of phytochemicals from dried and ground plants were performed using conventional method extractions; Soxhlet extractor and Cold-extraction. The isolation of pure compounds from crude extracts were carried out by using various chromatographic methods such as column chromatography (CC), thin layer chromatography (TLC) and preparative thin layer chromatography (PTLC). The structural elucidations of the isolated compounds were established based on the spectroscopic techniques such as UV-Vis, IR, MS, 1D-NMR (1H-NMR and 13C-NMR), 2D-NMR (COSY, DEPT, HSQC and HMBC) and single crystal X-ray diffraction analysis. …

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Overexpression Of Wild-Type Anxa7 Tumor Suppressor Gene Alters Cancer-Related Micrornas In Human Prostate Cancer Cells / Yap Lim Hui, Lim Hui Yap Jan 2013

Overexpression Of Wild-Type Anxa7 Tumor Suppressor Gene Alters Cancer-Related Micrornas In Human Prostate Cancer Cells / Yap Lim Hui, Lim Hui Yap

Student Works (2010-2019)

MicroRNAs (miRNAs) are endogenous 18-25nt RNAs that regulate genes at the protein translation level. They can act as tumor suppressors or oncogene and are often dysregulated in various cancers. ANXA7 is a tumor suppressor gene that encodes for a Ca2+-dependent membrane-binding protein and its expression was found to be reduced or lost in advanced androgen-independent prostate cancers. This research aims to identify miRNAs that are regulated by the ANXA7 tumor suppressor gene and the putative pathways involved in prostate cancer. The overexpression of wild-type ANXA7 was achieved by using a mammalian expression vector harboring the gene. From our miRNA microarray …

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The Characteristics Of Be Star In Delta Scorpii System / Nazhatulshima Ahmad, Ahmad Nazhatulshima Jan 2013

The Characteristics Of Be Star In Delta Scorpii System / Nazhatulshima Ahmad, Ahmad Nazhatulshima

Student Works (2010-2019)

Mechanisms of the disk formation in Be stars may differ from one Be star to another, which may result in the variations in the circumstellar disk’s spectral characters. The mechanism of disk formation is still under debate for the case of binary stars in which a mass transfer could not happened. -Scorpii, the target star in this study, is one of the bright Be binary stars that has been classified as a Be star since 1990s when the star shows a weak Balmer emission line. This thesis mainly presents the spectral characteristics in optical region from the year of 2007 …

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Radio Frequency Interference (Rfi) In Solar Monitoring / Norsuzian Binti Mohd Anim, Norsuzian Mohd Anim Jan 2013

Radio Frequency Interference (Rfi) In Solar Monitoring / Norsuzian Binti Mohd Anim, Norsuzian Mohd Anim

Student Works (2010-2019)

Radio frequency interference (RFI) distorted the detection of solar bursts from ground based observation. By using Compact Astronomical Low-cost Low-frequency Instrumentation Spectrometer Transportable Observatory (CALLISTO), the physical characteristic of solar burst, the structures of sun, velocity of solar flares are being studied. The results are useful for space weather studies and to protect the communication satellites and the space station. The interference from terrestrial sources of 13 chosen CALLISTO station all around the world are being identified. The objective is to understand the RFI’s impacts to the detection of solar monitoring from ground base. This study found that the highest …

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Strange Particle Production In High-Energy Electron Proton Collision / Zukhaimira Binti Zolkapli, Zukhaimira Zolkapli Jan 2013

Strange Particle Production In High-Energy Electron Proton Collision / Zukhaimira Binti Zolkapli, Zukhaimira Zolkapli

Student Works (2010-2019)

The strangeness total cross sections for ep neutral current deep inelastic scattering (DIS) have been measured using HERA-II data at a center-of-mass energy of s  318 GeV with the ZEUS detector at HERA. The 2003 & 2007 running period data were used with an integrated luminosity of 4.6 pb-1 and compared with ARIADNE Monte Carlo (MC) predictions. The differential production cross-sections of ,  ,    and 0sK were measured in two different kinematic regions,  2DAQ 25 GeV2 for high 2 Q DIS sample and 5  2DAQ 25 GeV2 for low 2 Q DIS sample. …

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Effect Of Catalyst Preparation And Surface Modification Synthesis And Nanostructuring Of Movtenb Oxide Catalyst For Propane Oxidation To Acrylic Acid / Fazliana Bt Abd Hamid, Fazliana Abd Hamid Jan 2013

Effect Of Catalyst Preparation And Surface Modification Synthesis And Nanostructuring Of Movtenb Oxide Catalyst For Propane Oxidation To Acrylic Acid / Fazliana Bt Abd Hamid, Fazliana Abd Hamid

Student Works (2010-2019)

A series of Mo1V0.3Te0.23Nb0.12 oxide catalysts were prepared using a standard recipe, with modifications to the method, i.e. addition of oxalic acid and diluents. These catalysts were subjected to activation process comprised of two different steps of calcination. The calcined samples were subjected to further modification by leaching processes in three different types of leaching media, i.e. water, nitric acid and ammonia solution. The structural, chemical, and thermal properties of the as-synthesized phase and surface modification catalyst were investigated with various characterization techniques, including X-ray diffraction (XRD),, BET surface area, X-ray fluorescence (XRF), scanning electron microscopy and energy dispersive X-ray …

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Pressure Sensitive Adhesives From Natural Rubber Latex And Oleic Acid-Based Alkyds / Siti Fatimah Binti Mohd Mustafa, Siti Fatimah Mohd Mustafa Jan 2013

Pressure Sensitive Adhesives From Natural Rubber Latex And Oleic Acid-Based Alkyds / Siti Fatimah Binti Mohd Mustafa, Siti Fatimah Mohd Mustafa

Student Works (2010-2019)

Development of environmental friendly products have becomes increasingly important in the recent years. This project is environmental concerns and new developments in adhesive technology to create safe systems that reduce the emission of volatile organic compounds (VOCs). In this study, pressure sensitive adhesives (PSAs) were synthesized directly from latex by using alkyd derived from palm oil-based polyester as tackifier resin. Firstly, three different oil lengths 45, 47 and 65 of alkyd resins namely (Alk-45, Alk47 and Alk-65) were synthesized under fatty acid process by employing fusion cook technique. The prepared resins were later characterized by FTIR, NMR, TGA, GPC and …

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Preparation And Characterisation Of Heat-Treated And Untreated Red Balau/Ldpe Composites / Ruth Anayimi Lafia-Araga, Ruth Anayimi Lafia Araga Jan 2013

Preparation And Characterisation Of Heat-Treated And Untreated Red Balau/Ldpe Composites / Ruth Anayimi Lafia-Araga, Ruth Anayimi Lafia Araga

Student Works (2010-2019)

Red balau saw dust was heat-treated at 180°C and 200°C for one hour and compounded with low density polyethylene (LDPE) at 9, 20 and 37 wt%, then injection moulded. The composites specimens were exposed to different environments and characterised for the thermal, dynamic mechanical and mechanical properties. Thermogravimetric analysis revealed that heat treatment improved the thermal properties of the wood flour and its LDPE composites. Differential scanning calorimetric study showed that wood had no significant effect on the melting behaviour of the composites. However, the degree of crystallinity of composites containing untreated wood flour increased with increasing wood content, while …

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Species Distribution And Molecular Variations In Drogonflies (Order: Odonata) Within The State Of Selangor, Malaysia / Noorhidayah Binti Mamat, Mamat Noorhidayah Jan 2013

Species Distribution And Molecular Variations In Drogonflies (Order: Odonata) Within The State Of Selangor, Malaysia / Noorhidayah Binti Mamat, Mamat Noorhidayah

Student Works (2010-2019)

Dragonflies have been used in an extensive array of studies dealing with the functional morphology, behavior, ecology, and evolution. They have been indicated to be important in functioning as bioindicators. The major aim of this study is to investigate the dragonfly population in the Selangor areas and to conduct the analysis on the molecular systematic and phylogenetics. Field sampling was done in 22 sites for the odonate biodiversity studies and the mitochondrial gene – partial regions of NADH dehydrogenase subunit 1 (ND1) was utilized for the molecular aspects. The results revealed a total of 1298 individuals belonging to 54 species …

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