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Parametric Resonance of Acoustic and Optical Phonons in a Quantum Well
Tran Cong Phong,Nguyen Quang Bau 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.5
The parametric resonance of acoustic and optical phonons in a quantum well in the presence of an external electromagnetic eld is theoretically predicted by using a set of quantum transport equations for the phonons. Dispersions of the resonant phonon frequency and the threshold amplitude of the field for parametric amplication of the acoustic phonons are obtained. If they are obtained, then they are also estimated for realistic semiconductor models.
Tran, Phong,Ho, Seok-Man,Kim, Bok-Geon,Vuong, Tuan Anh,Leem, Young-Eun,Bae, Gyu-Un,Kang, Jong-Sun American Society for Biochemistry and Molecular Bi 2012 The Journal of biological chemistry Vol.287 No.15
<P>p38MAPK plays an essential role in the transition of myoblasts to differentiated myotubes through the activation of MyoD family transcription factors. A promyogenic cell surface molecule, Cdo, promotes myogenic differentiation mainly through activation of the p38MAPK pathway. Two MAP3Ks, TAK1 and ASK1, can activate p38MAPK via MKK6 in various cell systems. Moreover TAK1 has been shown to promote myogenic differentiation via p38MAPK activation. In this study, we hypothesized that TAK1 and ASK1 might function as MAP3Ks in Cdo-mediated p38MAPK activation during myoblast differentiation. Both ASK1 and TAK1 were expressed in myoblasts and interacted with the cytoplasmic tail of Cdo and a scaffold protein, JLP. The depletion of TAK1 or ASK1 in C2C12 cells decreased myoblast differentiation, whereas overexpression of TAK1 or ASK1 in C2C12 cells enhanced myotube formation. In agreement with this, overexpression of ASK1 or TAK1 resulted in enhanced p38MAPK activation, and their knockdown inhibited p38MAPK in C2C12 cells. Overexpression of TAK1 or ASK1 in <I>Cdo</I><SUP>−/−</SUP> myoblasts and Cdo-depleted C2C12 cells restored p38MAPK activation as well as myotube formation. Furthermore, ASK1 and TAK1 compensated for each other in p38MAPK activation and myoblast differentiation. Taken together, these findings suggest that ASK1 and TAK1 function as MAP3Ks in Cdo-mediated p38MAPK activation to promote myogenic differentiation.</P>
Tran Cong Phong,Le Thi Thu Phuong,Huynh Vinh Phuc,Pham Tuan Vinh 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.2
We investigate the influence of phonon confinement on the optically-detected electrophonon resonance (ODEPR) effect and ODEPR linewidth in rectangular quantum wires (RQW). The ODEPR conditions as functions of the wire’s size and the photon energy are also obtained. The splittings of ODEPR peaks caused by the confined phonon are discussed. The numerical result for a specific RQW shows that in the two cases of confined and bulk phonons, the linewidth decreases with increasing wire size and increases with increasing temperature. Furthermore, in the small range of the wire’s size (<i>L</i> ≤ 40 nm), phonon confinement plays an important role and cannot be neglected in reaching the ODEPR linewidth.
Tran Cong Phong,Vo Thanh Lam,Bui Dinh Hoi 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.5
General analytic expressions for the absorption coefficient (ACF) of an intense electromagnetic wave (IEW) caused by confined electrons in doped semiconductor superlattices (DSSL) are obtained by using the quantum kinetic equation (QKE) for electrons in the case of electron-optical phonon scattering. A second-order multiphoton process is included in the result. The dependence of the ACF on the amplitude E0 and the photon energy hΩof an IEW, the plasma frequency ωp and the temperature T for a specific DSSL of n-GaAs/p-GaAs is achieved by using a numerical method. The computational results show that the dependence of ACF on the photon energy can be applied to optically detect the electric subbands in a DSSL.
Rate of Phonon Excitation and Conditions for Phonon Generation in Rectangular Quantum Wires
Tran Cong PHONG,Dinh Quoc VUONG,Le DINH,Nguyen Quang BAU 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Phonon generation via the Cerenkov eect in rectangular quantum wires is theoretically studied based on the quantum kinetic equation for the phonon population operator. Analytical expressions for the rate of change of the phonon population and conditions for phonon generation are obtained. Numerical results for the speci.c rectangular quantum wires show that the amplitude of the laser .eld must satisfy additional conditions that are dierent in comparison with those of the other works. The dierences between the generation of acoustic phonon and optical phonon are considered.
Parametric Resonance of Acoustic and Optical Phonons in a Doped Semiconductor Superlattice
Tran Cong Phong,Luong Van Tung,Nguyen Quang Bau 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.4
The parametric resonance of acoustic and optical phonons in a doped superlattice with a nondegenerative electron gas in the presence of a laser field is theoretically predicted by using a set of quantum transport equations for the phonons. Dispersions of the resonant phonon frequency and the threshold amplitude of the field for parametric amplification of the acoustic phonons are obtained. The amplitude is also estimated for realistic semiconductor models
Phong T. TRAN,Thu D. T. NGUYEN,Luan M. PHAM,Phuong T. T. PHAN,Phuong T. DO 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.4
This research examines the mediation of intrinsic motivation (IP) in the relationship between psychological capital (Psycap) and innovative performance (IP) in the educational environment of the transitioning economy. A test was based on a convenient sample of 440 University lecturers participating in a hardcopy survey was collected from ten universities and colleges in Southern Vietnam, from April 2020 to December 2020, while social isolation is strictly enforced by the government (Covid-19). The hypotheses are then proposed and conducted using confirmatory factor analysis (CFA) and the structural equation modeling technique (SEM). The testing structural model results reveal that all the hypotheses are satisfied at the 5% significance level. Intrinsic motivation is a partial mediator in the linkage between psychological capital and innovative performance. These findings suggest that the importance of Psychological Capital (PsyCap) of workers promotes job performance in general, especially in individuals’ creativity in a transitioning market, Vietnam. In addition, Based on the research results, several solutions are also proposed to promote innovative performance in the conditions of education in Vietnam. Besides, the author also gave a few comments on the findings as well as the limitations that this study encountered, especially how the survey samples were collected.
Tran Minh Ngoc,Tran Minh Man,Mai Thanh Phong,Mai Thanh Phong,Nguyen Huu Hieu 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.4
Silica nanoparticles were prepared from rice husk ash (RHA-silica) by precipitation method. The characterization of RHA-silica was studied by X-ray fluorescence, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy, and Brunauer-Emmett-Teller specific surface area. Results showed that RHA-silica was successfully synthesized with a particle size of 5-15 nm and purity of 98.08%. The obtained RHA-silica was applied with different content for fabrication of tubular ceramic-supported poly(vinyl alcohol) membranes using malic acid as a cross-linking agent (RHA-silica/MA-PVA) by dip-coating and solvent evaporation methods. The tubular ceramic-supported RHA-silica/MA-PVA membranes were used for dehydration of 95 wt% ethanol solution by pervaporation (PV) technology. Results indicated membrane with 15 wt% RHA-silica (15RHA-silica/MA-PVA) was suitable for the dehydration with permeate flux of 0.0856 kg/m2·h, separation factor of 46.6, and pervaporation separation index of 3.9 kg/m2h. The tubular ceramic-supported 15RHA-silica/MA-PVA membrane was characterized using XRD, FTIR, scanning electron microscope, differential scanning calorimetry, and contact angle measurement. Results showed that this membrane was 30 m thick, mechanical stable (swelling rate, 133.9%), hydrophobic (contact angle, 81o), and thermal stable (glass transition temperature, 138.7 oC). Therefore, the tubular ceramic-supported nanocomposite membrane could be considered as a potential alternative for PV dehydration of ethanol.
Effect of hydrothermal time on the structure and property of graphene oxide membrane
Tran Van Khai,Pham Thuy Trang,Le Ngoc Long,Le Van Thang,Tran Duc Chau,Vuong Vinh Dat,Mai Thanh Phong 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.4
Two dimensional graphene oxide (GO) has potential application in membrane separation owing to its unique structure andphysicochemical properties. In this study, the reduced graphene oxide (rGO) was synthesized from GO via hydrothermaltreatment at 160 oC for 1, 2, 3 and 4 h, and the rGO membranes were prepared on cellulose nitrate supporting membranesby vacuum filtration. The structural change and chemical composition of GO were investigated using X-ray diffraction (XRD),Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM),atomic force microscopy (AFM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS) andcontact angle measurements. The result shows that uniformly intact rGO membranes with good hydrophobicity could beachieved by adjusting the reduction degree of GO through changing the hydrothermal reaction time. The huge improvementof the hydrophobic property of rGO could be attributed to the removal of the most the hydrophilic oxygen-containingfunctional groups on the surface of GO. Additionally, the structure, chemical composition, and d-spacing of the GO can alsobe controlled by adjusting the reduction time. This method holds great potential because it can be prepared in large quantitiesat low cost, and suitable for applications in membrane technologies.
Critical Factors Affecting Selection of Travel Destinations: A Case Study in Vietnam
Thanh Phong TRAN,Trong Nghia PHAN,Hoang Thinh NGUYEN 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.9
This study is conducted to fill the research gap in proposing and testing the relationship between “Attitudes about the overall image of the destination”, “Subjective norms” and “Perceived behavioral control”. Simultaneously, we examine the relationship between these variables and tourists’ “intent to choose a destination.”. While most previous studies only deal with the relationship between destination image and intended behavior of tourists, this study uses the theory of planned behavior (Ajzen, 1991) to explain the intended behavior of tourists. In addition, the Theory of Destination Image (Echtner & Ritchie, 1991) is used to explain the factor “attitudes about the overall image of the destination”, contribute to supplementing and perfecting the Theory of Planned Behavior. This study uses a Structural Equation Modeling (SEM) to analyze a sample of 993 observations, the subjects of which are international tourists to Vietnam, to test the relationship between second-order constructs. The test results show that “Subjective norms” and “Perceived behavioral control” have an impact on “Attitudes about the overall image of the destination”. Moreover, all these three factors have an impact on “Intent to choose destination”, in which the factor “Perceived behavioral control” has the greatest impact on “intention to choose destination”.