Microbial Diversity In Trace Water Of Jet Fuel In Vietnam,
2017
Universiti Brunei Darussalam
Microbial Diversity In Trace Water Of Jet Fuel In Vietnam, Hien Lai Thuy, Hang Pham Thi, Nga Vuong Thi, Hai Hoang, Yamaguchi Nobuyasu, Tani Katsuji
ASEAN Journal on Science and Technology for Development
Microorganisms in petroleum product, including jet fuel, have been found by some English andAmerican authors since the 20’s of the last century. In 1958, after Bakanaukas isolated many microorganisms in jet fuel JP4, this topic was especially concentrated. Most of microorganisms living in jet fuel are able to degrade hydrocarbon of the fuel to obtain energy and carbon source for their growth. The presence of microorganisms in jet fuel not only brings about the lost of fuel in store process, but also briefly changes the component and structure of jet fuel. Moreover, the products of their metabolism, such as organic …
Some Results Of Study On Present Situation Of Household Solid Waste In Hanoi, Vietnam,
2017
Universiti Brunei Darussalam
Some Results Of Study On Present Situation Of Household Solid Waste In Hanoi, Vietnam, Yen To Thi Hai, Ha Pham Thi Thu, Dong Nguyen The, Tuyen Trinh Van, Kawai Kosuke, Matsui Saburo
ASEAN Journal on Science and Technology for Development
This paper presents some results on the study of Solid waste generated by households (hereinafter referred to as HSW) in Hanoi city. Compositions of the waste generated from three typical communities and their relationship with family life-style of each community were investigated. Differences among compositions of HSW of three resident groups of different incomes, lifestyles were analyzed. Based on the study results, some measures for better management of HSW and maximum reuse and recycle of HSW were proposed. By this way, the amount of HSW transported to landfill could be reduced and stabilization phase of landfill sites could be shortened.
Rapid Detection Of -Thalassemia Mutations In Thailand Using Multiplex Arms,
2017
Universiti Brunei Darussalam
Rapid Detection Of -Thalassemia Mutations In Thailand Using Multiplex Arms, Shimbhu D., Mirasena S., Sanguansermsri M., Sanguansermsri T.
ASEAN Journal on Science and Technology for Development
The number of mutations underlining b-thalassemia generate a wide variety of different clinical phenotypes. An understanding of the genotype is important for medical personnel in order to provide proper counseling to patients and their families. Characterization of these mutations should aid the planning of a prenatal diagnosis program for bthalassemia. The heterogeneity of the mutations makes it difficult and time consuming to identify the mutation in some individuals. We developed a single-tube multiplex amplification refractory mutation system (multiplex ARMS) to identify common ethnic- specific b-thalassemia mutations. Confirmation of multiplex ARMS results was carried out using direct sequencing. Three thousand three …
Studies On A Novel Recombinant Lipase A From Bacillus Subtilis Fs2,
2017
Universiti Brunei Darussalam
Studies On A Novel Recombinant Lipase A From Bacillus Subtilis Fs2, Nguyet Phung Thu, Thanh Nguyen Hong, Hai Truong Nam, Janson Jan-Christer
ASEAN Journal on Science and Technology for Development
A strain of Bacillus subtilis FS2 isolated from a traditional fish source in Vietnam has been shown to produce an enzyme possessing both a gelatinase and a lipase A (LipA) activity when tested on agar plates containing 0.1% tributyrin and 0.3% gelatine. A gene encoding LipA was isolated and expressed in E. coli BL21 (DE3). The enzyme has got an apparent Mr of 24 kDa, a pI of 9.2 and was purified to electrophoretical homogeneity by affinity chromatography. Both the lipase and the gelatinase showed optimum activity at pH 10 and at 30 0 C, with highest activity in the …
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 …
New Findings Notes Of The Parasitic Nematodes Of Terrestrial Invertebrates In Viet Nam,
2017
Universiti Brunei Darussalam
New Findings Notes Of The Parasitic Nematodes Of Terrestrial Invertebrates In Viet Nam, Luc Pham Van, Thanh Nguyen Vu, Spiridonov S.E.
ASEAN Journal on Science and Technology for Development
First results of the parasitological survey of Vietnamese terrestrial invertebrates performed in 2007 demonstrate extreme diversity of nematodes parasitic in these animals. The most interesting new findings are nematodes of four superfamilies: Drilonematoidea, Thelastomatoidea, Rhabditoidea and Ransomnematoidea. Further progress was achieved in last three years in the studies of Drilonematoidea nematodes – coelomic parasites of earthworms. One new genus and several new species were discovered in large megascolecids collected in Bac Bo (Tam Dao) and Nam Bo (Bidoup - Nui Ba N.P.). Passalidae beetles are colonial coleopterans inhabiting rotten wood in tropical forests throughout tropics, and are known as characteristic …
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 …
Potassium Permanganate As Oxidant In The Cod Test For Saline Water Samples,
2017
Universiti Brunei Darussalam
Potassium Permanganate As Oxidant In The Cod Test For Saline Water Samples, Goh Chin-Ping, Lim Poh-Eng
ASEAN Journal on Science and Technology for Development
The objective of this study is to investigate the feasibility of applying potassium permanganate (KMnO4) as the oxidant in the COD test for highly saline water samples. Initially, the COD values of various glucose standard solutions were determined by three methods, namely the standard closed reflux dichromate (CODCr), the acidic permanganate (CODMn) and the alkaline permanganate (CODOH) methods. The results showed that at COD values lower than 20 mg/L, the standard dichromate method was not applicable due to its poor precision (RSD > 10%). The CODOH method was less effective compared to the CODMn method as the recoveries were 0.71 and …
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. …
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 …
Application Of Nmr In The Investigation Of Dynamic Tautomerism Of 4(3h)-Quinazolinone System,
2017
Universiti Brunei Darussalam
Application Of Nmr In The Investigation Of Dynamic Tautomerism Of 4(3h)-Quinazolinone System, My Pham Thi Thanh, Kinh Chu Dinh, Thuy Thanh Thi Thu, Vinh Nguyen Ngoc, Chi Nguyen Thi Phuong
ASEAN Journal on Science and Technology for Development
Tautomerism of 4(3H)-quinazolinone system with [(2-hydroxyphenyl)methylene]-2-(4oxoquinazolin-3(4H)-yl)acetohydrazide and N’-[(1E)-(4-hydroxy-3-methoxyphenyl)methylene]-2-(4-oxoquinazolin-3(4H)-yl)acetohydrazide as two representative compounds was investigated on the basis of 1H NMR method at coalescence with the help of line formprogramme. The dynamic parameters such as k, Ea, DG*, DH*, DS* were fully calculated with high reliability.
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 …
Aromatase Inhibitory And Cytotoxic Activities Of Chemical Constituents From The Vietnamese Medicinal Plant Ban-Chi-Lien (Scutellaria Barbata D. Don),
2017
Universiti Brunei Darussalam
Aromatase Inhibitory And Cytotoxic Activities Of Chemical Constituents From The Vietnamese Medicinal Plant Ban-Chi-Lien (Scutellaria Barbata D. Don), Thao Do Thi, Huan Le Quang, Hieu Do Khac, Chien Nguyen Quyet, Hung Nguyen Van
ASEAN Journal on Science and Technology for Development
Aromatase inhibitory and cytotoxic activities were determined for apigenin, luteolin and the new diterpene named scutebarbalactone VN, which were obtained by bioassay-guided fractionation and isolation from the methanol extract of the Vietnamese medicinal plant Banchi-lien (Scutellaria barbata D. Don). In the aromatase inhibition assay, an IC50 value of 3.36 mM was found for scutebarbalactone VN, while IC50 values of 7.2 mM and 7.95 mM were found for the positive controls aminoglutethimide and b-estradiol, respectively. In the cytotoxicity assays using a panel of human cancer cell lines, scutebarbalactone VN showed promising anticancer activity with IC50 ranging from 2.15 to 8.3 mM …
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 …
Integrated Remote Sensing And Gis For Modeling Economic Rehabilitation Development Of Ex-Mine Sites,
2017
Universiti Brunei Darussalam
Integrated Remote Sensing And Gis For Modeling Economic Rehabilitation Development Of Ex-Mine Sites, Junaidi Junaidi, Goh Eric K.H.
ASEAN Journal on Science and Technology for Development
The potential environmental impacts of mining, increasing environmental legislation and public awareness have received increased attention world-wide in the last two decades. The focus of concern by the industry, environmental regulatory agencies and members of the public is the systematic rehabilitation of ex-mine sites to improve the quality at site for potential future commercial land use. The minerals extracted from these mine/quarry sites are essential in the construction, semiconductor, high-technology, ceramic and other manufacturing sectors for further industrial development. However, efficient engineering design and systematic economic evaluation of mine sites for site rehabilitation are required in maintaining the expected standards …
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 …
Characteristics Of Lithium Lanthanum Titanate Thin Films Made By Electron Beam Evaporation From Nanostructured La0.67-Xli 3xtio3 Target,
2017
Universiti Brunei Darussalam
Characteristics Of Lithium Lanthanum Titanate Thin Films Made By Electron Beam Evaporation From Nanostructured La0.67-Xli 3xtio3 Target, Dinh Nguyen Nang, Trong Le Dinh, Long Pham Duy
ASEAN Journal on Science and Technology for Development
Bulk nanostructured perovskites of La0.67-xLi3xTiO3 (LLTO) were prepared by using thermally ball-grinding from compounds of La2O3, Li2CO3 and TiO2. From XRD analysis, it was found that LTTO materials were crystallized with nano-size grains of an average size of 30 nm. The bulk ionic conductivity was found strongly dependent on the Li+ composition, the samples with x = 0.11 (corresponding to a La0.56Li0.33TiO3 compound) have the best ionic conductivity, which is ca. 3.2 x 10-3 S/cm at room temperature. The LLTO amorphous films were made by electron beam deposition. At room temperature the smooth films have ionic conductivity of 3.5 x …
Numerical Result For Variational Inequality Problems With Equality Constraint,
2017
Universiti Brunei Darussalam
Numerical Result For Variational Inequality Problems With Equality Constraint, Loi Pham Van
ASEAN Journal on Science and Technology for Development
In this paper we present some numerical results for illustrating a theoret- ical results obtained in our investigation in the field of variational inequality problems with constraint in the form of operator equation involving monotone operator.
Affine-Invariant Fourier Descriptors And Their Application In A Number Plate Recognizing System,
2017
Universiti Brunei Darussalam
Affine-Invariant Fourier Descriptors And Their Application In A Number Plate Recognizing System, Hai Nguyen Thanh, Long Pham The, Dinh Nguyen Cong
ASEAN Journal on Science and Technology for Development
This paper introduces a method for describing partial shapes that are affine-invariant. The proposed method facilitates the extraction of descriptors, which is effective for opened-curves and invariant to different viewpoints. This method helps to improve the performance and quality of real world object image recognizing systems. The proposed method was tested in a number plate recognition system.
