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A Provincial Analysis of Formal Economic Institutions and Growth in Vietnam
Bui,Thanh Trung,Diep,Gia Luat 한국유통과학회 2019 KODISA ICBE (International Conference on Business Vol.2019 No.-
Formal economic institutions, which are incentive-motivated mechanisms under the control of government, have widely been accepted as an important driver of economic development. However, the relative significance of each constituent has still remained ambiguous, especially in developing economies. This paper aims to fill this gap by investigating the contribution of three important formal economic institutions such as market entry, the security of property right, and anti-corruption mechanisms on provincial economic performance in Vietnam. The empirical results suggest that deregulation of market entry is essential for private investment, employment, and sales of enterprises. However, both the security of property right and anti-corruption provides unexpected outcomes as their improvement impede provincial economic outcomes. Finally, further analysis strongly suggests the heterogeneity in the economic effect of those formal institutions between six regions of Vietnam. In particular, the economic outcomes are positive in South East, negative in the least developed regions like Mekong River Delta or Northern Midland & Mountain, and unclear in other regions.
Bui Trung Thanh,Tran Hoang Hai,Pham Hung Van,Le Minh Tung,이재령 한국자원공학회 2019 Geosystem engineering Vol.22 No.4
The detection of hepatitis B surface antigen (HBsAg) with an immunoassay using magnetite nanoparticles (NPs) that bind hepatitis B surface antibody (anti-HBs) was investigated. Magnetite NPs with an average size of 32 nm were synthesized and functionalized using tetraethyl orthosilicate, 3-aminopropyltriethoxysilane, glutaraldehyde, and streptavidin. The functionalized NPs were conjugated with biotinylated anti-HBs to capture HBsAg. HBsAgs were detected with a sensitivity, specificity and agreement of 98%, 97%, and 97.5%, respectively, when compared to the rapid test. In addition, the novel method could also enrich HBsAgs, using different tube sizes and can facilitate amplification for the detection of microorganisms.
Thanh Bui Trung,Van Pham Hung,Hai Tran Hoang,Le Minh Tung,이재령 한국자원공학회 2015 Geosystem engineering Vol.18 No.4
A method for detecting glypican 3 (GPC3) liver cancer cells by coupling of anti-glypican 3 antibody (anti-GPC3) and magnetite nanoparticles (NPs) was investigated to detect GPC3 by enzyme-linked immunosorbent assay (ELISA) in this study. Magnetite NPs with the average size of 11 nm were synthesized by using co-precipitation method of Fe2+ and Fe3+ in NH3·H2O solution. First, silica was coated on the magnetite NPs using Stöber method to obtain Fe3O4/SiO2 core-shell structures and then 3-aminopropyltriethoxysilane (APTES) was treated on the Fe3O4/SiO2 by silanization reaction to achieve Fe3O4/SiO2/APTES nanostructures. After modified by APTES, the nanostructures were activated by glutaraldehyde (GA) to obtain functional groups on the nanostructures surface to bind with anti-GPC3 by covalent immobilization. The UV–vis spectroscopy was carried out to investigate the binding of anti-GPC3 to the NPs and binding efficiency (88.35%) was estimated by the Bradford method. The NPs bound anti-GPC3 (NPs/anti-GPC3) can detect GPC3 by using ELISA at low concentration (0.16 ng/ml).
Preparation and characterization of silicone resin nanocomposite containing CdSe/ZnS quantum dots
Trung, Nguyen Ngoc,Luu, Quynh‐,Phuong,Son, Bui Thanh,Sinh, Le Hoang,Bae, Jin‐,Young Wiley Subscription Services, Inc., A Wiley Company 2012 Polymer composites Vol.33 No.10
<P><B>Abstract</B></P><P>We report the preparation of the core/shell cadmium selenide/Zinc sulfide quantum dots (CdSe/ZnS QDs)‐silicone resin nanocomposite through the solution‐mixing method, followed by thermal hydrosilylation. After dispersing QDs into Dow Corning two‐component silicone resins (OE6630A and OE6630B at 1:4 mixing ratio by weight), the resins were cured at 150°C for 1.5 h to produce QD‐silicone resin nanocomposites. The curing behavior of the silicone resins resulting from the thermal hydrosilylation was studied using differential scanning calorimetry (DSC). The properties of the QD‐silicone resin nanocomposites were investigated by ultraviolet–visible (UV–vis), fluorescence, confocal laser scanning microscopy (CLSM), atomic force microscopy (AFM), and thermogravimetric analysis (TGA) measurements. The QDs that contain trioctylamine (TOA) as the original ligand can poison the Pt catalyst in the resins and inhibit the curing process by increasing the exothermic peak temperature, at which a lower heat of hydrosilylation is observed. Incorporating a small amount of CdSe/ZnS QDs (0.1 wt%) can greatly improve the thermal stability of the silicone resins. Moreover, CdSe/ZnS QDs tend to form clusters that are relatively homogeneously distributed in a cured silicone resin, offering good optical properties of 11.2 lm W<SUP>−1</SUP> luminous efficiency and 14.6% photoluminescence conversion efficiency (PCE) in light emitting device (LED) test. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers</P>
Bui Thanh Son,Nguyen Ngoc Trung,이은성,배진영 한국고분자학회 2012 Macromolecular Research Vol.20 No.6
This article describes the use of copolymeric dispersants with an acrylic backbone and phosphate side groups for formulating carbon black (CB)-epoxy composites. Six phosphate-modified acrylic copolymer dispersants were prepared from the corresponding epoxy-containing acrylic copolymers. The phosphate-modified dispersant with the highest concentration of hydrophobic alkyl chains and typical phosphate moiety groups showed a desirable passivation effect on the CB, and was found to lower the viscosity of the CB-epoxy paste, leading to the well-cured composite after heat treatment. The thick composite film prepared by employing the CB/phosphate-containing dispersant/epoxy paste was built up on a Cu plate by a screen printing process followed by thermal curing. The dielectric properties of the 3.1 vol% CB-filled epoxy film showed a high dielectric constant (K 6280) and a rather low dissipation factor (Df, 61%) @ 1 MHz.
Mathematical Modeling of a Variable Displacement Vane Pump for Engine Lubrication
Bui Ngoc Minh Truong,Dinh Quang Truong,Nguyen Thanh Trung,Ahn Kyoung Kwan 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
This paper developed a complete and accurate mathematical model for a typical variable displacement vane-type oil pump to investigate the working performance of the pump. Firstly, the detailed theoretical model was built based on pump’s geometric design and dynamic analyses. Next, numerical simulations with the constructed model and experiments on the real pump system were carried out to analyze the main power loss factors in order to develop the complete model with high accuracy. The estimated pump performance using the complete pump model was finally verified by numerical simulations in comparison with the practical tests.
A Vapor Sensor Based on a Porous Silicon Microcavity for the Determination of Solvent Solutions
Huy Bui,Thuy Van Nguyen,The Anh Nguyen,Thanh Binh Pham,Quoc Trung Dang,Thuy Chi Do,Quang Minh Ngo,Roberto Coisson,Van Hoi Pham 한국광학회 2014 Current Optics and Photonics Vol.18 No.4
A porous silicon microcavity (PSMC) sensor has been made for vapors of solvent solutions, and a method has been developed in order to obtain simultaneous determination of two volatile substances with different concentrations. In our work, the temperature of the solution and the velocity of the air stream flowing through the solution have been used to control the response of the sensor for ethanol and acetone solutions. We study the dependence of the cavity-resonant wavelength shift on solvent concentration, velocity of the airflow and solution temperature. The wavelength shift depends linearly on concentration and increases with solution temperature and velocity of the airflow. The dependence of the wavelength shift on the solution temperature in the measurement contains properties of the temperature dependence of the solvent vapor pressure, which characterizes each solvent. As a result, the dependence of the wavelength shift on the solution temperature discriminates between solutions of ethanol and acetone with different concentrations. This suggests a possibility for the simultaneous determination of the volatile substances and their concentrations.
Going beyond Border? Intention to Use International Bank Cards in Vietnam
Dzung Tran Trung PHAN,Thanh Thi Ha NGUYEN,Tuan Anh BUI 한국유통과학회 2019 The Journal of Asian Finance, Economics and Busine Vol.6 No.3
The paper aims to explore the factors affecting potential users of international bank cards in Vietnam. With milestones treaties being signed CPTPP and EVFTA, Vietnam is now exposing itself to the international open environment. Bank card market is at the core of this wind of change, and that is the reason for us to research the intention to use international bank cards. Given that the decision to choose international bank cards could either be the switch from domestic cards or adopting a brand new card, we develop some specific constructs to reflect that consideration, specifically PE and PD, asides from traditional constructs used in TPB and TAM frameworks. The analysis work is conducted using PLS-SEM approach. Our findings reveals that most of our proposed hypotheses are supported, in which SN plays the most important direct role to INT, while total effect of PU on INT is similar to that of SN. The newly introduced PD negatively and significantly impacts INT, and PE also has a positive impact on INT. The findings suggest that overall, it is important for bank card issuers to have a balance approach to the market, with focus on increasing usefulness and reducing potential disadvantages of international bank cards.