Structural Characterization Of Agar Extracted From Six Red Seaweed Species Growing In The Coast Of Vietnam,
2017
Universiti Brunei Darussalam
Structural Characterization Of Agar Extracted From Six Red Seaweed Species Growing In The Coast Of Vietnam, Van Tran Thi Thanh, Ly Bui Minh, Buu Ngo Quoc, Kinh Chu Dinh
ASEAN Journal on Science and Technology for Development
Polysaccharides extracted from six red seaweed species growing in Vietnam have been studied. Characterisation of their structure by chemical and spectroscopic methods showed that all of them have a basic repeating structure of alternating 3-linked b-D-galactopyranosyl and 4-linked 3,6-anhydro a-L-galactopyranosyl units with substituted methyl ether groups. The native agar offers only weak gelling abilities owing to the 4-linked a-L-galactopyranosyl 6-sulfate as its precursor. Conversion of this unit into the corresponding 3,6-anhydride by treating with hot alkali generally led to gel strength increasing. The agars from G. fisheri and G. firma are poorly substituted, while those from G.asiatica, G.tenustipitata and G. …
A Study On The Effect Of Noise And Vibration On Operators’ Readability Task Performance In A Mobile Driving Environment,
2017
Universiti Brunei Darussalam
A Study On The Effect Of Noise And Vibration On Operators’ Readability Task Performance In A Mobile Driving Environment, Khan Iqbal Ahmed, Mallick Z., Khan Zahid A.
ASEAN Journal on Science and Technology for Development
This paper presents a study in which the effect of noise and vibration on the task performance in a mobile driving environment is experimentally investigated. A readability kind of task, where a reading material was presented to the operators on a laptop screen was considered and the operators performed the task in a sitting posture without their back supported with the backrest of the seat. The task performance was measured in terms of mean number of characters read per minute by the operators, which served as data for statistical analysis. Results of the study showed that noise and vibration were …
Fault Location On A Distribution Feeder Using Fault Generated High Frequency Current Signatures,
2017
Universiti Brunei Darussalam
Fault Location On A Distribution Feeder Using Fault Generated High Frequency Current Signatures, Hizam Hashim, Crossley P.A.
ASEAN Journal on Science and Technology for Development
This paper describes how the fault generated travelling waves detected in the current signals at a single location on a distribution feeder can be used for fault location. The method identifies the fault section and the probable location of the fault by comparing the relative distance of each “peak” in the high frequency current signals to the known reflection points in the distribution feeder. The probable fault location is then used within a transient power system simulator that models the actual network. The resulting simulated current waveforms are then cross-correlated against the original signal. If the estimated fault location is …
Effects Of Sr Substitution On Crystalline Structure And Raman Spectra Of La2-Xsrxnio4+Δ,
2017
Universiti Brunei Darussalam
Effects Of Sr Substitution On Crystalline Structure And Raman Spectra Of La2-Xsrxnio4+Δ, Thanh Tran Dang, Hong Le Van
ASEAN Journal on Science and Technology for Development
Effects of Sr2+ substitution for La3+ on oxygen concentration and structure of La2-xSrxNiO4+δ have been observed by X-ray diffraction and Raman scattering. Oxygen concentration and unit cell volume of the material decrease monotonously in dependence of x. The vibration modes were calculated for La2NiO4 in K2NiF4 type structure with the group symmetry of I4/mmm. The Raman active modes for this symmetry were also theoretically identified. Raman back scattering spectra have been carried out for all the ceramic polycrystalline samples at room temperature. Two Raman lines at 224.6 cm-1 and 433 cm-1 , assigned to Eg and A1g vibration modes of …
The Evidence Of Non N-Glycan Linked Mannose In Exochitinase (42 Kda) From Trichoderma Harzianum Bio10671 Glycosylation,
2017
Universiti Brunei Darussalam
The Evidence Of Non N-Glycan Linked Mannose In Exochitinase (42 Kda) From Trichoderma Harzianum Bio10671 Glycosylation, Mustafa Muskhazli, Zaman Faridah Qamaruz, Ramli Salfarina, Tohfah Nor Farizan, Ithnin Nalisha, Wallis Greg
ASEAN Journal on Science and Technology for Development
Chitinase 42 kDa produced by Trichoderma harzianum has been proven as a prime compound to be excreted onto the hyphae of the pathogen causing localised cell wall lysis at the point of interaction. This finally initiate the process of the host cell becomes empty of cytoplasm, disintegrates and shows a rapid collapse. This study investigates the existence of N-glycan linked mannose in chitinase 42 kDa produced by the Malaysian T. harzianum strain BIO10671. The chitinase 42 kDa from T. harzianum BIO10671 was initially purified using anion exchange chromatography prior to a series of experiments such as immunoblotting against the chitinase …
Pretreatment Of Lignocellulosic Biomass For Enzymatic Hydrolysis,
2017
Universiti Brunei Darussalam
Pretreatment Of Lignocellulosic Biomass For Enzymatic Hydrolysis, Hoa Doan Thai, Man Tran Dinh, Hau Ngo Viet
ASEAN Journal on Science and Technology for Development
The cost of raw materials continues to be a limiting factor in the production of bio-ethanol from traditional raw materials, such as sugar and starch. At the same time, there are large amount of agricultural residues as well as industrial wastes that are of low or negative value (due to costs of current effluent disposal methods). Dilute sulfuric acid pretreatment of elephant grass and wood residues for the enzymatic hydrolysis of cellulose has been investigated in this study. Elephant grass (agricultural residue) and sawdust (Pulp and Paper Industry waste) with a small particulate size were treated using different dilute sulfuric …
Synthesis Of Acetic Acid From Ethanol By Electrooxidation Technique Using Ni-Cu-Pvc Electrode,
2017
Universiti Brunei Darussalam
Synthesis Of Acetic Acid From Ethanol By Electrooxidation Technique Using Ni-Cu-Pvc Electrode, Riyanto Riyanto, Othman Mohamed Rozali, Salimon Jumat
ASEAN Journal on Science and Technology for Development
A usage of Ni-Cu-PVC electrode for the oxidation of ethanol by electrochemical technique will be reported in this paper. In this work, the effect of electrodes on the yields of acetic acid was determined. Electrode used was made of the mixtures of Ni powder, Cu powder and of polyvinyl chloride (PVC) with various percentages. Electrooxidation of 0.20 M ethanol in 0.16 M KOH (24 mL) were carried out using chrono coulometry (CC) at a potential of 1050 mV for 6 hours with continious stirring. Electrooxdation result obtained was analyzed using High Performance Liquid Chromatography (HPLC). The test result shows that …
Effect Of Injector Opening Pressure On Performance And Emission Of Lpg - Methyl Ester Of Mahua Oil Dual Fuel Engine,
2017
Universiti Brunei Darussalam
Effect Of Injector Opening Pressure On Performance And Emission Of Lpg - Methyl Ester Of Mahua Oil Dual Fuel Engine, Kapilan N.
ASEAN Journal on Science and Technology for Development
One of variables, which affect the performance and emission of dual fuel engine is injection pressure. Hence in the present work, effect of Injector opening pressure on the performance of the engine was studied. A four stroke single cylinder engine was modified to work in dual fuel mode. Three injector opening pressures (180 bar, 200 bar and 220 bar) were considered for the present work. Methyl ester of mahua oil was used as pilot fuel and LPG was used as primary fuel. From the test results, it was observed that the injector opening pressure of 200 bar results in higher …
Dibutyltin(Iv) Alkylcyclohexyldithiocarbamates: Spectroscopic Characterization And Crystal Structures Of Dibutyltin(Iv) N-Methyl And N-Ethylcyclohexyldithiocarbamate,
2017
Universiti Brunei Darussalam
Dibutyltin(Iv) Alkylcyclohexyldithiocarbamates: Spectroscopic Characterization And Crystal Structures Of Dibutyltin(Iv) N-Methyl And N-Ethylcyclohexyldithiocarbamate, Awang Normah, Baba Ibrahim, Aziz Y. Farina Abd., Yamin Bohari M.
ASEAN Journal on Science and Technology for Development
A new series of dibutyltin(IV) alkylcyclohexyldithiocarbamates of the type (C4H9)2Sn[S2CNR(C6H11)]2 (R = CH3, C2H5, i-C3H7) have been successfully synthesized using in-situ method. These compounds were characterized by elemental analysis, infrared and 13C NMR spectroscopy. A single crystal X-ray analysis of dibutyltin(IV) ethylcyclohexyldithiocarbamate, (C4H9)2Sn[S2CN(C2H5)(C6H11)]2 (compound 2) showed that the system of this crystal is triclinic with space group P-1 while dibutyltin(IV) methylcyclohexyldithiocarbamate, (C4H9)2Sn[S2CN(CH3)(C6H11)]2 (compound 1) has monoclinic system and it’s space group is P21/c. In the crystal structure of compound 2, the dithiocarbamate ligands are bidentically chelated to the tin atom with non-equivalent of the Sn-S distances: Sn(1)-S(1) = 2.9255(11) and …
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 …
Soil-Structure Interaction Analyses Of Pile Supported Building Frame,
2017
Universiti Brunei Darussalam
Soil-Structure Interaction Analyses Of Pile Supported Building Frame, Chore H.S., Ingle R.K.
ASEAN Journal on Science and Technology for Development
The effect of the soil-structure interaction on the simple single storeyed and two bayed space frame resting on pile group of two piles with flexible cap is examined in this paper by resorting to more rational approach and realistic assumptions. Initially, 3-D FEA is carried out independently for the frame on the premised of fixed column bases. Later, pile foundation is worked out separately. The stiffness so obtained for foundation is used in the interactive analysis of frame to quantify the effect of soil- structure interaction on the response of the superstructure. For modeling the foundation system two approaches of …
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. …
Principal Stresses In Non-Linear Analysis Of Bakun Concrete Faced Rockfill Dam,
2017
Universiti Brunei Darussalam
Principal Stresses In Non-Linear Analysis Of Bakun Concrete Faced Rockfill Dam, Ahmad Mohd Hilton, Noorzaie Jamaloddin, Al Qbadi Fayda
ASEAN Journal on Science and Technology for Development
With rapid population growth and accelerating economic development, much of the world’s WATER which requires urgent attention to ensure sustainable use. Nowadays, Concrete Faced Rockfill Dam (CFRD) is preferred among dam consultant due to its advantages. They are designed to withstand all applied loads; namely gravity load due to its massive weight and hydrostatic load due to water thrust from the reservoir. Bakun CFRD, which ranks as the second highest CFRD in the world when completed, is analyzed to its safety due to both loads mentioned earlier by using Finite Element Method. 2-D plane strain finite element analysis of non-linear …
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 …
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 …
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 …
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.
The Effect Of Inner Diaphragms And Non-Continuous Sill Section On The Stiffness Of Automotive B-Pillar,
2017
Universiti Brunei Darussalam
The Effect Of Inner Diaphragms And Non-Continuous Sill Section On The Stiffness Of Automotive B-Pillar, Tan C.F., Shamsuddin S.A., Shafie M.H.
ASEAN Journal on Science and Technology for Development
The paper discusses the knowledge on the behaviour of T-frame under specific loading will be obtained by experimental methods in order to investigate the deflection of the vehicle B-pillar or T-frame. In addition, a series of T-frame were designed with inner diaphragm at various location in the sill member in order to investigate the effect of inner diaphragm and noncontinuous closed hat section in the sill member. Lastly, the results from the experimental tests were compared with the finite element analysis results to demonstrate the effectiveness of the inner diaphragm in the automotive B-pillar.
Study On Structure And Crystallization Of Polypropylene Grafted Maleic Anhydride/Nanoclay Composite,
2017
Universiti Brunei Darussalam
Study On Structure And Crystallization Of Polypropylene Grafted Maleic Anhydride/Nanoclay Composite, Chuong Bui, Hung Dang Viet
ASEAN Journal on Science and Technology for Development
Nanocomposite from polypropylene grafted maleic anhydride (PP-g-MA) and nanoclay were prepared by melt proccessing in Brabender extruder. XRD analysis shows the formation of nanostructure (intercalated and exfoliated) of nanocomposite with interlayer space (d-space) increasing from 26.3Å to 30.9Å. These structures, however, do not affect the microcrystalline structure of polymer part of nanocomposite in whole. The study on nonisothermal crystallization shows the development in 3-dimentional direction of crystallites, that means spherulite form of crystalline structure.
