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Thuy Dung PHAM THI1,Anh Tin NGO2,Nam Tien DUONG3,Van Kien PHAM4 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.5
The purpose of this study is to evaluate the impact of organizational culture on job satisfaction and organizational commitment among employees in small and medium-sized enterprises in Ho Chi Minh City, Vietnam. The study hypothesized that organizational culture has a significant influence on employees’ satisfaction and that satisfaction also significantly impactsorganizational commitment among employees. The data are collected from a sample of 240 office employees. Structural Equation Modeling is used to determine the influence of organizational culture dimensions,including open working environment, salary, and rewards, empowerment, management style, corporate values, on employees’ satisfaction and organizational commitment. The findings showed that the five dimensions of organizational culture positively impact employees’ satisfaction and that job satisfaction significantly influences organizational commitment. Thus, job satisfaction serves as the bridge between organizational culture and commitment. The current study contributes to providing a practical insight into the relationships between organizational culture, employees’ job satisfaction, and organizational commitment. Based on that, managers can develop suitable personnel policies for their organizations to simultaneously enhance employees’ performance and satisfaction, which makes them stay with the company.
Van Vang Le,Anh Tuan Hoang,Xuan Duong Pham,Van Viet Pham 국제이네비해양경제학회 2018 International Journal of e-Navigation and Maritime Vol.9 No.1
In recent years, much interest has been devoted to bio-fuels because of their beneficial effects on environment, agriculture and economic development. Raw vegetable oil – a kind of bio-fuels, still exits many downsides, is potential renewable fuel replaced for ever-exhausted fossil fuel. In this report, vegetable oil which is available in the South of Vietnam such as raw coconut oil is studied by heating up different temperature with the aim at decreasing its high viscosity and density and meeting the fuel requirements. The experiments are conducted on heated coconut oil (HCO) and fossil diesel oil (DO) using an 80hp of small marine diesel engine. The results of engine performance as using DO and HCO included engine power (Ne), specific fuel consumption (SFC), thermal efficiency (TE), emission characteristics such as carbon monoxide (CO), unburned hydrocarbon (HC), smoke, nitrogen oxides (NOx) at internal feature are measured. The experiment results show higher SFC, CO, HC and smoke emissions, and lower TE, and NOx emissions for HCO with respect to DO. In addition, this study also reveals that, 1000C of HCO is said to be the most suitable heating temperature as getting the engine performance equals to DO.
Pham, Van-Long,Duong, Van-Tinh,Choi, Woojin The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.4
A high-efficiency active cell-to-cell balancing circuit for Lithium-Ion battery modules is proposed in this paper. By transferring the charge directly from the highest voltage cell to the lowest voltage cell using an LLC resonant converter designed to achieve zero-voltage switching (ZVS) and nearly zero-current switching (ZCS) for all of the primary switches and zero-voltage zero-current switching (ZVZCS) for the diodes in the secondary, the proposed topology can achieve a high efficiency and a fast balancing speed with a simple control and design. In order to show the improved performance of the proposed method, a prototype circuit was built with a battery module having twelve Lithium-Ion (Li-Ion) batteries. Experimental results are presented to verify the shorter balancing time and higher efficiency of the proposed method when compared with conventional methods. The measured time for the balancing of the twelve cells was 47 min and a maximum efficiency of 94.5% was achieved at 1.5 W.
Single-Crystal like MgB<sub>2</sub> thin films grown on c-cut sapphire substrates
Duong, Pham Van,Ranot, Mahipal,Kang, Won Nam The Korea Institute of Applied Superconductivity a 2014 한국초전도저온공학회논문지 Vol.16 No.3
Single-crystal like $MgB_2$ thin film was grown on (000l) $Al_2O_3$ substrate by using hybrid physical-chemical vapor deposition (HPCVD) system. Single crystal properties were studied by X-ray diffraction (XRD) and the full width at half maximum (FWHM) of the (0001) $MgB_2$ peak is $15^{\circ}$, which is very close to that has been reported for $MgB_2$ single-crystal. It indicates that the crystalline quality of thin film is good. Temperature dependence on resistivity was investigated by physical property measurement system (PPMS) in various applied fields from 0 to 9 T. The upper critical field ($H_{c2}$) and irreversibility field ($H_{irr}$) were determined from PPMS data, and the estimated values are comparable with that of $MgB_2$ single-crystals. The thin film shows a high critical temperature ($T_c$) of 40.4 K with a sharp superconducting transition width of 0.2 K, and a high residual resistivity ratio (RRR=21), it reflects that $MgB_2$ thin film has a pure phase structure.
Dao, Van-Duong,Larina, Liudmila L.,Tran, Quoc Chinh,Bui, Van-Tien,Nguyen, Van-Toan,Pham, Thanh-Dong,Mohamed, Ibrahim M.A.,Barakat, Nasser A.M.,Huy, Bui The,Choi, Ho-Suk Elsevier 2017 Carbon Vol.116 No.-
<P>This work focuses on systematic studies of dissolution engineering for Pt0.9M0.1/graphene(M = Au, Co, Cu, Fe, Mo, Ni, Pd, Ru, and Sn) counter electrodes (CEs). The developed nanohybrid materials exhibit higher catalytic activity and electrical conductivity compared with those of Pt/graphene CEs. The results also indicate the improved stability of the developed CEs in iodide electrolyte. Furthermore, the trend in the variation of the reactivity of the PtM alloys agrees well with the concept of density functional theory (one-electron description). An enhancement in the catalytic activity of the developed nanohybrids results from the electronic effect that originates from an upward shift of the platinum d-band to the Fermi energy level upon alloying. Thus, the Pt(0.9)M(0.1)graphene nanohybrids are cost-effective alternative CE materials to the expensive Pt. The obtained results provide a foundation for enhancing the catalytic activities of CEs for dye-sensitized solar cells (DSCs). The implementation of the Pt0.9M0.1/graphene nanohybrids offers significant potential for increasing the efficiency of DSCs. (C) 2017 Elsevier Ltd. All rights reserved.</P>
Pham, Duong,Van Ngoc, Huynh,Jung, Soon-Gil,Kang, Dae Joon,Kang, Won Nam Elsevier 2018 Current Applied Physics Vol.18 No.6
<P><B>Abstract</B></P> <P>We report a facile method to enhance the critical current density (<I>J</I> <SUB>c</SUB>) of superconducting MgB<SUB>2</SUB> thin films. MgB<SUB>2</SUB> thin films were deposited on zinc acetate dehydrate (Zn(CH<SUB>3</SUB>COO)<SUB>2</SUB>2H<SUB>2</SUB>O) spin-coated Al<SUB>2</SUB>O<SUB>3</SUB> (000l) substrates by using a hybrid physical-chemical vapor deposition system at low temperatures. Synthesis of MgB<SUB>2</SUB> at low temperatures can reduce the substitution of Zn into the Mg site, hence avoiding the reduction of superconducting critical temperature. MgB<SUB>2</SUB> thin films grown on ZnO-buffered layers showed a significant enhancement of <I>J</I> <SUB> <I>c</I> </SUB> in the magnetic field due to the creation of additional pinning sources, namely point defects and grain boundaries. Broad peaks were observed in the magnetic field dependence of the flux pinning force density, indicating competition of different pinning sources.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The high quality of MgB<SUB>2</SUB> films were synthesized successful at a temperature as low as 480 °C by optimizing the condition of a hybrid physical-chemical deposition. </LI> <LI> The MgB<SUB>2</SUB> films with ZnO impurity layer show a significant enhancement of <I>J</I> <SUB>c</SUB> compared to the pristine film, and the film with 23 nm of ZnO shows the best performance of <I>J</I> <SUB>c</SUB>. </LI> <LI> The critical temperature <I>T</I> <SUB>c</SUB> was decreased under the effect of ZnO impurity, but this decreasing is less than that of other methods (like Carbon substitution or SiC impurity). </LI> <LI> The flux pinning forces show the improvement of pinning sources, i.e., grain boundary and point pinning in ZnO impurity films. The pinning sources composed by the ZnO are effective for flux pinning at both 5 K and 20 K. </LI> </UL> </P>
Pham Thi Thanh,Nguyen Van Duong,Nguyen Hai Yen,Nguyen Huy Ngoc,Nguyen Mau Lam,Kieu Xuan Hau,유성조,Nguyen Huy Dan 한국물리학회 2018 Current Applied Physics Vol.18 No.3
In this work, we investigated the influence of additional compounds of Nd-Cu-Al, Dy-Nb-Al, Dy-Zr-Al and Nb-Cu-Al on coercivity of sintered Nd-Fe-B magnets. The additional nanoparticles with size in the range of 40e80 nmwas mixed with the micrometer Nd-Fe-B powder before sintering process. The results show that the coercivity of the sintered Nd-Fe-B magnets can be improved by introducing additional nanoparticles to their grain boundaries. The improvement of the coercivity of the magnets is clearly dependent on composition and fraction of the additional compounds. While the Dy-Nb-Al, Dy-Zr-Al and Nb-Cu-Al compounds degrade the coercivity of the sintered Nd-Fe-B magnets, the Nd-Cu-Al nanoparticles considerably improve this quantity. The coercivity the sintered Nd16.5Fe77B6.5 magnets has been enhanced about 40% by adding 3 wt% of the Dy-free compound of Nd40Cu30Al30.
Pham, Thanh-Dong,Lee, Byeong-Kyu,Nguyen, Van Noi,Dao, Van-Duong Elsevier 2017 Journal of catalysis Vol.352 No.-
<P>This article has been retracted: please see Elsevier Policy on Article Withdrawal (<U>https://www.elsevier.com/about/our-business/policies/article-withdrawal</U>).</P><P>This article has been retracted at the request of the Editor, after consultation with the corresponding author Professor Byeong-Kyu Lee due to the methods described in the paper for the preparation of the catalysts being incomplete and the results not being reproduced. This was brought to the editors’ attention via a letter to the editor. Professor Lee agreed that the methods description was not complete and agreed with this course of action. <Journal of catalysis, 352 (2017) 13 – 21>, http://dx.doi.org/10.1016/j.jcat.2017.04.024.</P>
SangbumKim,Pham van Duong,Donghyup Ha,Young-Hoon Oh,Won Nam Kang,Seung Pyo Hong,Ranyoung Kim,Jong Seo Chai 한국초전도.저온공학회 2016 한국초전도저온공학회논문지 Vol.18 No.2
Superconducting properties of thin film MgB2 superconductors irradiated with 45 MeV -particle beam were studied. After the irradiation, enhancement of the critical current density and pinning force was observed, scaling close to strong pinning formula. Double logarithmic plots of the maximum pinning force density with irreversible magnetic field show a power law behavior close to carbon-doped MgB2 film or polycrystals. Variation of normalized pinning force density in the reduced magnetic field suggests scaling formulas for strong pinning mechanism like planar defects. We also observed a rapid decay of critical current density as the vortex lattice constant decreases, due to the strong interaction between vortices and increasing magnetic field.