Study On Some Properties And Morphology Of Composites Based On Polyethylene Grafted Acrylic Acid/Ethylene-Vinyl Acetate Copolymer/Calcium Carbonate,
2017
Universiti Brunei Darussalam
Study On Some Properties And Morphology Of Composites Based On Polyethylene Grafted Acrylic Acid/Ethylene-Vinyl Acetate Copolymer/Calcium Carbonate, Hoang Thai, Cong Do Van
ASEAN Journal on Science and Technology for Development
Composites based on polyethylene grafted acrylic acid (PE-g-AAc)/ethylene-co-vinylacetate copolymer (EVA)/calcium carbonate (CaCO3) were prepared by melt mixing. Relative melt viscosity, morphology, mechanical properties and thermostability of the composites were studied. The experimental results show that the presence of (CaCO3) activated by stearic acid (10-20 wt.%) changes lightly stable torque of polymer blend of PE-g-AAc/EVA. Use of modified PE improves compatibility of PE and EVA as well as makes the components disperse into each other better than in blends using unmodified PE. Tensile strength and elongation at break of both polymer blends decrease with presence of CaCO3. However, tensile strength of …
Characterization Of Alginate Prepared From Brown Seaweeds In Thua Thien-Hue Province, Vietnam,
2017
Universiti Brunei Darussalam
Characterization Of Alginate Prepared From Brown Seaweeds In Thua Thien-Hue Province, Vietnam, Thien Tran Vinh, Kinh Chu Dinh, Hoa Tran Thai, Khieu Dinh Quang
ASEAN Journal on Science and Technology for Development
The characterization of alginate prepared from brown seaweeds in TT-Hue province of Vietnam was investigated. Composition and the sequential structure of alginate were determined by 1HNMR, 13C-NMR, TOCSY, 1H-1H COSY, and 1H-13C-HSQC spectrum. It is found that alginate with molecular weight around 101 KDa is composed of homopolymeric regions of M and G blocks, interspersed with very small amount of regions of alternating structure of MG block. This information is essential for application guideline of alginate in TT-Hue province.
Classification And Zoning Of Water Quality For Three Main Rivers In Binh Tri Thien Region (Central Vietnam) Based On Water Quality Index,
2017
Universiti Brunei Darussalam
Classification And Zoning Of Water Quality For Three Main Rivers In Binh Tri Thien Region (Central Vietnam) Based On Water Quality Index, Hop Nguyen Van, To Thuy Chau, Tung Truong Quy
ASEAN Journal on Science and Technology for Development
Huong, Thach Han and Kien Giang rivers are the important surface water sources in Thua ThienHue, Quang Tri and Quang Binh provinces, respectively (in Central Vietnam). The river water samples were taken monthly (from June 2001 to May 2002 for Kien Giang river and from January to December of 2004 for Thach Han and Huong rivers) at selected sites. The temperature, pH, conductivity (EC), salinity, turbidity (TUR), DO, COD, BOD5, nitrate, ammonia, phosphate, total solids (TS), hardness, total dissolved iron, total coliform (TC), fecal coliform (FC) and sodium adsorption ratio (SAR) of water samples were analyzed. Water quality index developed …
Temporo-Spectral Coherent Structure Of Turbulence And Pressure Using Fourier And Wavelet Transforms,
2017
Universiti Brunei Darussalam
Temporo-Spectral Coherent Structure Of Turbulence And Pressure Using Fourier And Wavelet Transforms, Le Thai-Hoa, Nguyen Dong-Anh
ASEAN Journal on Science and Technology for Development
Studying the spatial distribution in coherent fields such as turbulent and turbulent-induced force ones is important to model and evaluate turbulent-induced forces and response of structures on the turbulent flows. Turbulent field-based coherent function is commonly used for the spatial distribution characteristic of induced forces in the frequency domain. This paper will focus to study spectral coherent structure of turbulence and forces in not only the frequency domain using conventional Fourier transform-based coherence, but also temporo-spectral coherent one in the time-frequency plane thanks to wavelet transform-based coherence for more understanding of the turbulence and force coherences and their spatial distributions. …
Electrochemical Model Of Euglena Sanguinea Ehrenberg Stimulated With Multi-Level Electromagnetic Fields,
2017
Universiti Brunei Darussalam
Electrochemical Model Of Euglena Sanguinea Ehrenberg Stimulated With Multi-Level Electromagnetic Fields, Packamwongsang K., Noppanakeepong S., Naranong N., Phaewbang P., Pleuksananon P., Packamwongsang W.
ASEAN Journal on Science and Technology for Development
This research aimed at studying the property of Euglena Sanguinea Ehrenberg (E. sanguinea) before and after being stimulated by multi-level electromagnetic fields (MLEM). After the stimulation, it was found that physical properties were changed, i.e., cell membrane and components deformed. Main biochemical compositions were changed in accordance with new electrochemical equation which was estimated from FTIR bands. Moreover, the estimated electrical results before and after being stimulated, i.e., impedance and complex relative permittivity of main biochemical compositions from extraction, were then measured, simulated, and compared by means of Cole-Cole plot technique which yielded the statistic correlation 0.89 at 95% confidence …
Genetic Algorithm Based Solution In Pwm Converter Switching For Voltage Source Inverter Feeding An Induction Motor Drive,
2017
Universiti Brunei Darussalam
Genetic Algorithm Based Solution In Pwm Converter Switching For Voltage Source Inverter Feeding An Induction Motor Drive, Jegathesan V.
ASEAN Journal on Science and Technology for Development
This paper presents an efficient and reliable Genetic Algorithm based solution for Selective Harmonic Elimination (SHE) switching pattern. This method eliminates considerable amount of lower order line voltage harmonics in Pulse Width Modulation (PWM) inverter. Determination of pulse pattern for the elimination of some lower order harmonics of a PWM inverter necessitates solving a system of nonlinear transcendental equations. Genetic Algorithm is used to solve nonlinear transcendental equations for PWM-SHE. Many methods are available to eliminate the higher order harmonics and it can be easily removed. But the greatest challenge is to eliminate the lower order harmonics and this is …
Influence Of Temperature On The Performance Of Photovoltaic Polycrystalline Silicon Module In The Bruneian Climate,
2017
Universiti Brunei Darussalam
Influence Of Temperature On The Performance Of Photovoltaic Polycrystalline Silicon Module In The Bruneian Climate, Malik A. Q., Ming Lim Chee, Sheng Tan Kha, Blundell M.
ASEAN Journal on Science and Technology for Development
The influence of working temperature for a polysilicon module has been investigated in Brunei Darussalam for a period of two years. The rise in temperature produces thermal agitation which not only increases the dark current but also enhances the losses of free carriers in a polycrystalline module. The efficiency and the output power decreases with an increase in the working temperature. A maximum decline in the output power of 97% has been measured under a dominated diffused radiation environment. The temperature coefficients have been obtained and equations are developed to evaluate the change in the rating of module at any …
Measurment Of Bending Properties Of Rhizophora Tropical Wood,
2017
Universiti Brunei Darussalam
Measurment Of Bending Properties Of Rhizophora Tropical Wood, Hamdan Sinin, Hasan Mahbub, Nohe Yoann
ASEAN Journal on Science and Technology for Development
The Young’s modulus, load at the yield point and proportional limit stress from the compression bending (cb) test were compared with the four point bending tests (4pb). The theoretical Young’s modulus are larger than the real reading for 5mm and 10mm thick specimens, except for 200mm long specimens due to specimen nonlinearity. The experimental results for the short specimens are slightly high compared to the theory due to uniaxial compression in both tensile and compressive planes. Since the additional deflection produced by the shearing force and the stress concentration at the loading point was smaller with the compression bending test …
Ant Intelligence Routing,
2017
Universiti Brunei Darussalam
Ant Intelligence Routing, Gan Chye Ong, Wong K. Daniel, Woon Wei-Le
ASEAN Journal on Science and Technology for Development
We introduce AIR, a new ant-based routing protocol for ad hoc wireless networks. AIR incorporates recent technology advances in ad hoc routing protocols, such as ring-based searching and third-party reply, while retaining the characteristics and benefits of ant-based routing protocols, including probabilistic routing tables and pheromone evaporation. In addition, we combine the best features of previous ant-based routing protocols with new features like update ants and two-way route establishment, to further improve performance. We compare the performance of AIR against AODV and DSR using appropriately chosen simulations, the results of which are presented and discussed. We find that AIR is …
Preservation Of Milks With Addition Of Antibacterial And Aromatic Supplements Produced In Japan,
2017
Universiti Brunei Darussalam
Preservation Of Milks With Addition Of Antibacterial And Aromatic Supplements Produced In Japan, Khusniati Tatik
ASEAN Journal on Science and Technology for Development
The good antibacterial and aromatic supplements produced in Japan for preservation of milks at storage was investigated. Nineteen sweet and herb materials were made juices as supplements to preserve the milks. Bacterial counts, pH, protease activities and lipase activities of supplemented milks, and antibacterial activities of supplements were detected by total plate counts, glass electrode pH meter, azocasein, modified Dole extraction and turbidity methods. Eleven of nineteen milks added 10% of honey, garlic, ginger, horseradish, “sansho”, “yuzu”, green perilla, “nira”, green tea, bamboo leaf and “yomogi” were selected as good supplemented milks based on pH of these milks closed to …
Synthesis Of Ferrite Nanoparticles With Protein Molecules Immobillized On Their Surfaces,
2017
Universiti Brunei Darussalam
Synthesis Of Ferrite Nanoparticles With Protein Molecules Immobillized On Their Surfaces, Hai Tran Hoang, Phuc Le Hong, Dung Doan Thi Kim, Huyen Nguyen Thi Le, Long Bui Duc, Thang Nguyen Tien, Do Vu Van, Quynh Nguyen Nguyen, Abe Masanori
ASEAN Journal on Science and Technology for Development
The ferrite (a Fe3O4 – gFe2O3 mixed solution) fine particles, ~8 nm in size were synthesized from an aqueous solution. Trypsin, a proteolytic enzyme or a protein, was immobilized onto the surfaces of those particles during the synthesis process. The process was performed in the open air at a temperature as low as 4°C and on near-neutral condition of pH = 9, which is compatible with most of the bioactive molecules as well as trypsin. Therefore this technique is advantageous for preparing magnetite particles having biomolecules immobilized on their surfaces, which will be used for biomedical applications utilizing magnetic separation …
Causes Of Tractor Breakdowns And Requisite Solutions A Case Study Of Small Tractor Use In Riau Province, Indonesia,
2017
Universiti Brunei Darussalam
Causes Of Tractor Breakdowns And Requisite Solutions A Case Study Of Small Tractor Use In Riau Province, Indonesia, Paman Ujang, Uchida S., Inaba S., Kojima T.
ASEAN Journal on Science and Technology for Development
A survey has been undertaken to look into the causes of tractor breakdowns on field operations and the main constraints associated with repair and maintenance, and to recommend a solution to the problems in Riau Province. The owners of sixty-two small tractors were interviewed, from three regencies chosen of the Province in 2003. As a result, the working capacity of the tractors was relatively high and the average annual use was relatively low compared to the national average. Most tractor operators did not have sufficient skill to operate tractors. The tractor breakdowns resulted from operators’ mistakes, fuel and oil defilement, …
A New Investigation Of Vietnam’S Beryl,
2017
Universiti Brunei Darussalam
A New Investigation Of Vietnam’S Beryl, Binh Nguyen Van, Hong Nguyen Thi
ASEAN Journal on Science and Technology for Development
The paper presents briefly new investigation of Vietnam beryl group, especially some characteristics of regional geology of Song Chay granite massif and new find of big crystals of beryl in them. The green beryl is found in quartz - mica - tourmaline, mica - feldspar – quartz pegmatite bodies in the south part of Song Chay granite - gneiss massif near Na Chi and Tan Nam villages, Quang Binh district, Ha Giang province.
Artificial Intelligent System For Measurement Of Harmonic Powers,
2017
Universiti Brunei Darussalam
Artificial Intelligent System For Measurement Of Harmonic Powers, Jerome Jovitha, Vinoth P.
ASEAN Journal on Science and Technology for Development
The importance of the electric power quality (PQ) demands new methodologies and measurement tools in the power industry for the analysis and measurement of the basic electric magnitudes necessary. This paper presents a new measurement procedure based on neural networks for the estimation of harmonic amplitudes of current/voltage and respective harmonic powers. The measurement scheme is built with two neural network modules. The first module is an adaptive linear neuron (ADALINE) that is the kernel part of estimation of complex harmonic coefficients of the current/voltage. The second module is feedforward neural network that obtains the harmonic active/reactive powers. In order …
A New Qos Guarantee Sla Based-Scheme For Handoff Calls In Wireless Networks,
2017
Universiti Brunei Darussalam
A New Qos Guarantee Sla Based-Scheme For Handoff Calls In Wireless Networks, Phuong Nguyen Cao, Quan Tran Hong, Lee Sang-Ho, Moon Jung-Mo
ASEAN Journal on Science and Technology for Development
The most important thing is guarantee QoS over wireless infrastructures. The efficient of service level agreement (SLA) is becoming increasingly important to both service providers and customers. This paper presents some traffic control schemes for improving QoS, trafficmodel and performance evaluation are described. We are defining a new scheme for improving handoff call performances in wireless networks, a finite queuing scheme for the handoff calls. SLA measurement calculates the packet delay parameter (PD) of handoff calls. The handoff calls will be accepted into queue if their PD will be smaller than the average waiting time of the queue. Important performance …
Studies Of Monomer Impregnation And Polymerized “In-Situ” In Wood Using Dynamic Mechanical Thermal Analyzer (Dmta),
2017
Universiti Brunei Darussalam
Studies Of Monomer Impregnation And Polymerized “In-Situ” In Wood Using Dynamic Mechanical Thermal Analyzer (Dmta), Hamdan S., Liew Y.L., Talib Z.A.
ASEAN Journal on Science and Technology for Development
Some tropical hardwoods (acacia mangium, madhuca utilis, dacrydium spp., dipterocarpus spp.,dyera costulata, shorea spp., shorea gibbosa, shorea macrophylla, endospermum diadenum, cratoxylum arborescens) are selected and impregnated with methyl methacrylate (MMA) and polymerized “in-situ” by using catalyst-heat technique. Treatability of the wood as determinedfrom the fractional volumetric retentions of monomer i.e. fraction of voids filled by the impregnant showed that the mean retention range from 15.03% (acacia mangium) to 56.59% (cratoxylum arborescens). The penetration of monomer evaluated using ultrasonic wave showed that the treated wood had higher velocities which indicate significant increase in density. This paper deals with the viscoelastic relaxation …
Studies On Chitosan - Benzaldehyde Interaction In A Homogeneous System And Its Adsorption Behavior Of Metal Ions In Aqueous Solution,
2017
Universiti Brunei Darussalam
Studies On Chitosan - Benzaldehyde Interaction In A Homogeneous System And Its Adsorption Behavior Of Metal Ions In Aqueous Solution, Thien Do Truong, Tuyen Nguyen Van, Nhi Tran Thi Y
ASEAN Journal on Science and Technology for Development
In this work, N-benzylidene chitosan was synthesized by chitosan –benzaldehyde interaction in a homogeneous system. The modified polymers were characterized by means of infrared (IR) spectra, X-Ray diffraction and thermal analysis. Their adsorption behavior was investigated by atomic absorption spectrophotometry. The experimental results showed that N-benzylidene chitosan had better adsorption properties and higher chemical resistance than that of chitosan.
Arsenic And Copper Uptake By Cabbages Grown On Polluted Soils,
2017
Universiti Brunei Darussalam
Arsenic And Copper Uptake By Cabbages Grown On Polluted Soils, Phuong Nguyen Thi Kim, Dung Nguyen Thi
ASEAN Journal on Science and Technology for Development
Cabbages (Brassica Juncea (L.) Czern) were grown in pot experiments on typical unpolluted and polluted soils with concentration changing from 20.50 - 50.00 mg As/kg and 156.00 - 413.00 mg Cu/kg dry soil. The results demonstrate the elevation of As and Cu in soil may lead to increased uptake by these cabbages subsequent entry into human food chain. It was found 11.84- 32.12 mg As/kg and 46.86 - 94.47 mg Cu/kg dry leaves. It has tendency increase uptake and accumulation of Cu in cabbage tissue with increasing cultivated time, whereas, it was found accumulation of As in cabbages tissue decreased …
Aromatic Plants From Vietnam, Sources Of Phenylpropanoid Products For Industry,
2017
Universiti Brunei Darussalam
Aromatic Plants From Vietnam, Sources Of Phenylpropanoid Products For Industry, Hoi Tran Minh
ASEAN Journal on Science and Technology for Development
Aromatic plants produce by vapour distillation or other processes essential oils which are products with high commercial value used in the natural product industries such flavour and fragrance, perfumes and cosmetics industries as well as pharmaceutical industry. The aim of this study was to characterise some aromatic plants from Vietnam through the chemical composition of their essential oils. We got interested in essential oils which contained a main component with high to ultra high content, susceptible to find an industrial use. For this study, a dozen of plants have been selected. The composition of their essential oils will be compared …
Gasification Study Of Sarawak Coals,
2017
Universiti Brunei Darussalam
Gasification Study Of Sarawak Coals, Othman Nor Fadzilah, Bosrooh Mohd Hariffin
ASEAN Journal on Science and Technology for Development
Thermogravimetry (TG) has been applied in a preliminary investigation, to the gasification of two low rank Sarawak coals. The coal samples, about 10 mg were investigated within the temperature range 30–900°C at different heating rate of 10, 20 and 30°C min-1, under a synthetic air atmosphere for the gasification study. The kinetic parameters were determined using Arrhenius type reaction model assuming a first-order reaction. The reactivity, RT values are fitted with Arrhenius equation at r2 = 0.83 - 0.98 for MP coal, while the RT values for MB coal are fitted with the Arrhenius equation at r2 = 0.99. The …
