Peculiar Optical Properties Of Co2mnga Alloys,
2017
Universiti Brunei Darussalam
Peculiar Optical Properties Of Co2mnga Alloys, Rhee Joo Yull, Kudryavtsev Y.V., Kim K.W., Lee Y.P.
ASEAN Journal on Science and Technology for Development
Co2MnGa alloy was prepared by the conventional arc-melting method. The optical conductivity (OC) spectrum of the alloy was measured by a rotating-analyzer spectroscopic ellipsometer. The OC spectrum was also calculated based on the electronic structure by using the full-potential linearized-augmented-plane-wave method within the local-spin-density approximation to the density-functional theory. The calculated OC spectrum does not agree well with the experimental one. Since the Co2MnGa alloy could be a strongly-correlated material, the so-called 'LDA+U' method was applied with U = 5.4 eV. The calculated OC spectrum using the 'LDA+U' method agrees very well with the experimental one. The inclusion of the …
New Approach Of Highly Efficient Fermentation Process For Bio Ethanol Using Xylose As Agricultur E Residues,
2017
Universiti Brunei Darussalam
New Approach Of Highly Efficient Fermentation Process For Bio Ethanol Using Xylose As Agricultur E Residues, Ahmed Abu Saleh, Watanabe Seiya, Hamdan Sinin, Kodaki Tsutomu, Makino Keisuke
ASEAN Journal on Science and Technology for Development
Agricultural waste biomasshas already been transferred to bioethanol and used as energy related products, although many issues such as efficiency and productivity still exist to be overcome. In this study, the protein engineering was applied to generate enzymes with completely reversed coenzyme specificity and developed recombinant yeasts containing those engineered enzymes for construction of an efficient biomass-ethanol conversion system. Recombinant yeasts were constructed with the genes encoding a wild type xylose reductase (XR)and the protein engineered xylitol dehydrogenase (XDH)(with NADP) of Pichiastipitis. These recombinant yeasts were characterized based on the enzyme activity and fermentation ability of xylose to ethanol. The …
S Tudies On The Phase Transitions And Properties Of Tungsten (Vi) Oxide Nanoparticles By X - Ray Diffraction (Xrd) And Thermal Analysis,
2017
Universiti Brunei Darussalam
S Tudies On The Phase Transitions And Properties Of Tungsten (Vi) Oxide Nanoparticles By X - Ray Diffraction (Xrd) And Thermal Analysis, Abdullah S.F., Radiman S., Abdul Hamid M.A., Ibrahim N.B.
ASEAN Journal on Science and Technology for Development
Tungsten (VI) oxide, WO3nanoparticles were synthesized by colloidal gas aphrons(CGAs) technique.The resultant WO3nanoparticleswere characterized by thermogravimetric-differential thermal analysis (TG-DTA) and X-Ray diffraction (XRD) measurements in order to determine the phase transitions, the crystallinity and the size of theWO3nanoparticles. As a comparison, transmission electron microscope (TEM) was used to investigate the size of the WO3nanoparticles. The result from XRD and DTA show that the formation of polymorphsWO3nanoparticles have the following sequence: orthorhombic (b-WO3)®monoclinic (g-WO3) ®triclinic (d-WO3) ®monoclinic (e-WO3) with respect to the calcination temperature of 400, 500, 600 and 700°C. No diffraction peaks were found in the X-Ray diffraction measurements for …
Mixed - Mode Operating System For Real - Time Performance,
2017
Universiti Brunei Darussalam
Mixed - Mode Operating System For Real - Time Performance, M. Hasan M., S. Sultana, C.K. Foo
ASEAN Journal on Science and Technology for Development
The purpose of the mixed-mode system research is to handle devices with the accuracy of real-time systems and at the same time, having all the benefits and facilities of a matured Graphic User Interface(GUI)operating system which is typicallynon-real-time. This mixed-mode operating system comprising of a real-time portion and a non-real-time portion was studied and implemented to identify the feasibilities and performances in practical applications (in the context of scheduled the real-time events). In this research an i8751 microcontroller-based hardware was used to measure the performance of the system in real-time-only as well as non-real-time-only configurations. The real-time portion is an …
Energy Cost Of Seed Drying,
2017
Universiti Brunei Darussalam
Energy Cost Of Seed Drying, Jittanit Weerachet, Srzednick George, Driscoll Robert
ASEAN Journal on Science and Technology for Development
In this work, the energy costs of drying corn, rice and wheat seeds between 3 drying options were compared. They consisted of 1) two-stage drying by using fluidised beddrye (FBD) in the 1ststage and in-store dryer (ISD) in the 2ndstage, 2) single-stage drying by fixed bed dryer (FXD) and 3) two-stage drying by using FXD in the 1ststage and ISD in the 2ndstage. The drying conditions selected for comparison were proved to be safe for seed viability by the previous studies. The results showed that the drying options 2 and 3 consumed less energy than option 1. However, the benefits …
Cathodic Electrodeposition Of Cu 4 Sns 4 Thin Films From Acidic Solution,
2017
Universiti Brunei Darussalam
Cathodic Electrodeposition Of Cu 4 Sns 4 Thin Films From Acidic Solution, Kassim Anuar, Min Ho Soon, Tee Tan Wee, Abdullah Abdul Halim, Sharif Atan, Haron Md. Jelas, Nagalingam Saravanan, Kuang
ASEAN Journal on Science and Technology for Development
In this work the synthesis of copper tin sulfide thin films by electrodeposition is carried out. The films were deposited onto ITO glass substrates from anaqueous solution bath containingcopper sulfate, tin chloride and sodium thiosulfate at pH 1 and room temperature. Prior to the deposition, a cyclic voltammetry experiment was carried out between two potential limits (+1000 to -1000 mV versus Ag/AgCl) to probe the effect of the applied potential and to determine the most likely suitable electrodeposition potential for the deposition of copper tin sulfide. The deposition was attempted at various cathodic potentials such as -400, -600, -800, -1000 …
Water-Soluble N -Substituted Chitosan Derivatives,
2017
Universiti Brunei Darussalam
Water-Soluble N -Substituted Chitosan Derivatives, Le Dung Ph., Thien D.T., Dong N.T., Nhi T.T.Y., An N.T.
ASEAN Journal on Science and Technology for Development
Many water-solubleN-substituted chitosan derivatives have been prepared having the typical -NH-CH2- linkage. Both the Michael reaction and alkylation with monochloroacetic acid at pH 8- 8.5 offer relatively simple ways for their synthesis.
Microbial Degradation Of Endosulfan In Agricultural Soils,
2017
Universiti Brunei Darussalam
Microbial Degradation Of Endosulfan In Agricultural Soils, Ismail B.S., Enoma A.O.S.
ASEAN Journal on Science and Technology for Development
A study of the degradation of endosulfan (6, 7, 8, 9, 10, 10-hexachloro – 1, 5, 5a, 6, 9, 9a –hexahydro – 6, 9- methano – 2, 4, 3 – benzodioxanthiepin 3 – oxide) in Malaysian sandy loam and clay soils was carried out using a radioisotopic technique under laboratory conditions. It was demonstrated that endosulfan possessed long half-lives of 433, 495 and 462 days in aerobic sandy loam, aerobic clay and anaerobic clay soils respectively. Endosulfan degrades faster in non-sterile than in sterile soils. This study indicates that microorganisms are involved in the degradation of endosulfan. In general, degradation …
Development Of Hole Recognition System From Step File,
2017
Universiti Brunei Darussalam
Development Of Hole Recognition System From Step File, Tan C. F., Ismail N., Wong S.V., Sulaiman S., Osman M.R.
ASEAN Journal on Science and Technology for Development
This paper describes the development of Hole Recognition System (HRS) for Computer-Aided Process Planning (CAPP) using a neutral data format produced by CAD system. The geometrical data of holes is retrieved from STandard for the Exchange of Product model data (STEP). Rule-based algorithm is used during recognising process. Current implementation of feature recognition is limited to simple hole feat ures. Test results are presented to demonstrate the capabilities of the feature recognition algorithm.
Marine Natural Products And Their Potential Application In The Future,
2017
Universiti Brunei Darussalam
Marine Natural Products And Their Potential Application In The Future, Van Minh Chau, Van Kiem Phan, Hai Dang Nguyen
ASEAN Journal on Science and Technology for Development
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Suitability Of Sago Starch Blended With Acrylamide As An Additive On Handsheets Made From Recycled Pulp Fibers,
2017
Universiti Brunei Darussalam
Suitability Of Sago Starch Blended With Acrylamide As An Additive On Handsheets Made From Recycled Pulp Fibers, Sin Yeng Wong, Tahir Paridah Md., Kang Chiang Liew
ASEAN Journal on Science and Technology for Development
This study was carried out to determine the suitability of sago starch blended with acrylamide as paper additive. Solutions of unmodified and blended sago starch with acrylamide, were prepared at 5% weight over volume (w/v) basis before the basic properties (i.e., pH, viscosity and solid content) were determined. Thestarches were thenused to coat on laboratory made handsheets from recycled pulps. Various effects were studied, namely, modification of sago starch, addition of different types of initiator and further curing at different temperatures. The incorporation of acrylamide into sago starch through blending signif icantly increased the pH and viscosity of the solutions. …
Studies On Fucoidan And Its Production From Vietnamese Brown Seaweeds,
2017
Universiti Brunei Darussalam
Studies On Fucoidan And Its Production From Vietnamese Brown Seaweeds, Minh Ly Bui, Quoc Buu Ngo, Duy Nhut Nguyen, Duc Thinh Pham, Thi Thanh Van Tran
ASEAN Journal on Science and Technology for Development
Sulfated fucans are among the most widely studied of all the sulfated polysaccharides of plant origin that exhibit biological activities in mammalian systems. In this report fucoidans from some Vietnamese Sargassumspecies such as S.polycystum, S.oligocystum, S.mcclurei, S. Swartzii and denticaprum were extracted and fractionated on a DEAE-Sephadex A-25 column. On the basis of chemical and spectral analyses, the fucoidan fractions obtained were found to be the sulfated fucogalactans containing sulfate ester groups and uronic acid, and composed essentially of fucose and galactose, as well as a minor amount of other sugars. The polysaccharide fractions were tested for anticancer activity. The …
The Effects Of Palmvitee On Human Nasal Septal Chondrocytes Culture Expansion And Cartilage Reconstruction,
2017
Universiti Brunei Darussalam
The Effects Of Palmvitee On Human Nasal Septal Chondrocytes Culture Expansion And Cartilage Reconstruction, Ruszymah B.H.I., Aminuddin B.S., Gapor A., Fuzina H.
ASEAN Journal on Science and Technology for Development
Palmvitee may act as a beneficial supplement to cartilage tissue engineering which is currently still has certain limitation on chondrocyte expansion and dedifferentiation. Our objectives in thisstudy were to evaluate the effects of Palmvitee on the growth kinetic and phenotype gene expression of human nasal septal chondrocytesin monolayer expansion as well as cartilage reconstruction via tissue engineering technology. Human chondrocytes were cultured inmediums containing various Palmvitee concentrations. Among the different test groups, the medium containing Palmvitee at 3 μg/ml supported the highest chondrocyte growth rate. The gene expression in monolayer chondrocytes culture supplemented with 3 μg/ml Palmviteedemonstrated similar results as …
Medium Optimization For The Production Of Biomass By Cunninghamella Sp. 2a1 Using Response Surface Methodology,
2017
Universiti Brunei Darussalam
Medium Optimization For The Production Of Biomass By Cunninghamella Sp. 2a1 Using Response Surface Methodology, Sulaiman Siti Aminah, Hamid Aidil Abdul, Yusoff Wan Mohtar Wan
ASEAN Journal on Science and Technology for Development
A statistical design approach has been used to optimize the production of biomass byCunninghamellasp. 2A1, evaluated based on lipidless biomass. A 23full factorial centralcomposite design (CCD) was chosen to study the combined effects of three factors; ammoniumtartrate, peptone and glucose concentrations. The p-value for each factors was < 0.05 suggestingthat these factors have significant effect on the production of lipidless biomass. The productionis represented by a linear model with p-value < 0.0001. The optimized medium consists of 3.86g/l ammonium tartrate, 55.84 g/l glucose and 7.73 g/l peptone predicted 16.83 g/l lipidlessbiomass. Results from four replications based on the optimized medium produced 18.48 g/llipidless biomass, which are in close agreementwith the predicted value. The coefficient forglucose was the highest indicating it as the most significant factoraffecting lipidless biomassproduction.
On The Dense Families In The Relational Datamodel,
2017
Universiti Brunei Darussalam
On The Dense Families In The Relational Datamodel, Duc Thy Vu, Son Nguyen Hoang
ASEAN Journal on Science and Technology for Development
In this paper, dense families of relation schemes are introduced. We characterize minimal keys of relation schemes in terms of dense families. Note that, the dense families of database relations were introduced by Jarvinen [6]. We prove that the set of all minimal keys of a relation scheme s= (U, F) is the transversal hypergraphs of a hypergraph D– {∅}, where Dis any s-dense family. We give a necessary and sufficient condition for an abitrary family to be s-dense family. We also present some dense families of relation schemes. Furthermore, in this paper, we also study antikeys by means of …
Spot Welding Copper - 1% Cr Electrode Tips Produced Via Equal Chan Nel Angular Pressing,
2017
Universiti Brunei Darussalam
Spot Welding Copper - 1% Cr Electrode Tips Produced Via Equal Chan Nel Angular Pressing, Hussain L.B., Aljuboury Ali A., Gebril M.A.M., Sharif Nurulakmal Moh
ASEAN Journal on Science and Technology for Development
A sharp 120o Equal channel angular pressing (ECAP) was applied at room temperature to refine the grains sizes of pure copper and copper - 1% Chromium alloy for spot welding electrode tips application. Initially deformation behavior was investigated with the position using colorful plasticine as work piece followed by copper alloy. It was found the deformation at the central part of the work piece is heavily sheared than the outer part. Optical and Scanning electron microscopy were used to study the progress of grain refining under the influence of rotation and number of passes during pressing. The influence of elongated …
Study On Moisture-Cur Ed Polyurethane As Undercoating Layer For Metallization,
2017
Universiti Brunei Darussalam
Study On Moisture-Cur Ed Polyurethane As Undercoating Layer For Metallization, Mohamad Ibrahim M.N., Izat M.E., Wahida A.R., Sipaut C.S.
ASEAN Journal on Science and Technology for Development
In this work a technique of metallizing substrate via electroless plating using moisture-cured polyurethane (MCPU) system as the undercoat is presented. MCPU prepolymer was prepared by mixing polyethylene glycol divinyl ether and diphenylmethane-4, 4’-diisocyanate in 1:1 ratio. The effects of etching time as well as curing period on the surface characteristic of MCPU undercoating were investigated. Contact angle measurements, FTIR and SEM were employed to study the changes on the surface of the treated MCPU undercoatsprior to electroless nickel plating. Electroless plating was performed using nickel bath and visual inspection was performed after completing the electroless plating cycles. Relative increase …
A Comparison Of The Push And Pull Production Systems At Their Opti Mal Designs Under The Economic Consideration,
2017
Universiti Brunei Darussalam
A Comparison Of The Push And Pull Production Systems At Their Opti Mal Designs Under The Economic Consideration, Chiadamrong N., Kohly P.
ASEAN Journal on Science and Technology for Development
The term “push” and “pull” have been used to explain a wide variety of production inventory systems. The distinction refers to a specific attribute, which can be identified by observing the mechanisms for controlling material flow on the shop floor and a specific policy for the management of inventories and production schedules. This paper gives an attempt to compare these systems under their optimal settings under a constraint resource. Two optimal-seeking methods (Taguchi method and Response Surface Methodology) are used to suggest the optimized design of the system under an economic term, which is the profit generated from the system. …
Black And White Lahar As Inorganic Support For The Immobilization Of Yeast Invertase,
2017
Universiti Brunei Darussalam
Black And White Lahar As Inorganic Support For The Immobilization Of Yeast Invertase, C. Sabularse Veronica, T. Tud Mayrene, Lacsamana Marivic S., Solivas Josefina L.
ASEAN Journal on Science and Technology for Development
Volcanic ejecta or lahar can serve as an inorganic support for the immobilization of invertase. Pampanga and Bicol lahar samples were pretreated by ignition at 550oC for 5 hrs followed by concentrated hydrochloric acid treatment, activatedby reaction with aminopropyltriethoxysilane (APTS) and then covalently bound to invertase using glutaraldehyde as linker. Chemical tests confirmed the attachment of APTS to lahar and glutaraldehyde to silanized lahar. The quantity of immobilized invertase on Pampanga white, Pampanga black and Bicol black lahar were 98.73%, 96.73% and 84.27%,respectively. Conditions for maximum activity of invertase immobilized on Pampanga white lahar were pH 3.5, 45oC and 0.3 …
Recycled Pet For Rice Husk/Polyester Composites,
2017
Universiti Brunei Darussalam
Recycled Pet For Rice Husk/Polyester Composites, Ahmad I., Abu Bakar D. R., Mokhilas S. N., Ramli A
ASEAN Journal on Science and Technology for Development
Rice husks were combined with unsaturated polyester resin, synthesized from glycolysed product of poly (ethylene terephthalate) (PET) waste to form rice husk (RH)/polyester composites. PET from post-consumer soft drink bottles was recycled through glycolysis, followed by polyesterified with maleic anhydride and then cross-linked with styrene to producea formulation for the resin. Characterizations of the synthesized resin were performed byhydroxyl, acid values and Fourier Transform InfraRed (FTIR) techniques. The effect of filler loading and surface modification of rice husks on the mechanical properties of the composites were also investigated. It has been observed that the increasing filler loading resulted in reduction …
