Factors Affecting Foreign Direct Investment: Evidence on Tay Ninh Province

TRAN, Thinh Quoc,DANG, Tuan Anh,TRAN, Ngoc Anh Thu Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.9

The purpose of this paper is to examine the impact of consumer price index, infrastructure, human resources, trade openness, and private credit on the attraction of foreign direct investment (FDI) in Tay Ninh province as well as to emphasize the important role of FDI in economic growth of developing areas. The research data was collected from Tay Ninh Statistical Office with 80 samples of a 20-year period from 2000 to 2019. Also, OLS regression method using Eviews software was employed to analyze the data obtained. The findings revealed that human resources, infrastructure and private credit have a positive and significant impact on FDI attraction in Tay Ninh province, while consumer price index was proven to affect FDI attraction negatively. Accordingly, competent authorities of Tay Ninh province should focus on stabilizing prices as well as implementing policies for developing local human resources and attracting high-quality personnel from foreign countries. Tay Ninh province also needs to pay more attention to information technology investment for synchronous development of infrastructure. Moreover, the State Bank of Tay Ninh branch needs to consider more credit sources to provide support packages for businesses, creating a strong basis for establishments to attract FDI for the province's economic development.

Characterization of the Transglycosylation Reaction of 4-α-Glucanotransferase (MalQ) and Its Role in Glycogen Breakdown in Escherichia coli

( Dang Hai Dang Nguyen ),( Sung-hoon Park ),( Phuong Lan Tran ),( Jung-wan Kim ),( Quang Tri Le ),( Winfried Boos ),( Jong-tae Park ) 한국미생물생명공학회(구 한국산업미생물학회) 2019 Journal of microbiology and biotechnology Vol.29 No.3

We first confirmed the involvement of MalQ (4-α-glucanotransferase) in Escherichia coli glycogen breakdown by both in vitro and in vivo assays. In vivo tests of the knock-out mutant, ΔmalQ, showed that glycogen slowly decreased after the stationary phase compared to the wild-type strain, indicating the involvement of MalQ in glycogen degradation. In vitro assays incubated glycogen-mimic substrate, branched cyclodextrin (maltotetraosyl-β-CD: G4-β-CD) and glycogen phosphorylase (GlgP)-limit dextrin with a set of variable combinations of E. coli enzymes, including GlgX (debranching enzyme), MalP (maltodextrin phosphorylase), GlgP and MalQ. In the absence of GlgP, the reaction of MalP, GlgX and MalQ on substrates produced glucose-1-P (glc-1-P) 3-fold faster than without MalQ. The results revealed that MalQ led to disproportionate G4 released from GlgP-limit dextrin to another acceptor, G4, which is phosphorylated by MalP. In contrast, in the absence of MalP, the reaction of GlgX, GlgP and MalQ resulted in a 1.6-fold increased production of glc-1-P than without MalQ. The result indicated that the G4-branch chains of GlgP-limit dextrin are released by GlgX hydrolysis, and then MalQ transfers the resultant G4 either to another branch chain or another G4 that can immediately be phosphorylated into glc-1-P by GlgP. Thus, we propose a model of two possible MalQ-involved pathways in glycogen degradation. The operon structure of MalP-defecting enterobacteria strongly supports the involvement of MalQ and GlgP as alternative pathways in glycogen degradation.

Grain-Size Effect on the Dielectric Properties of La1.5Sr0.5NiO₄ Nano-Particle Materials

Tran Dang Thanh,Le Van Hong,Nguyen Xuan Phuc 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6

We have manufactured ceramic samples of La1.5Sr0.5NiO₄and studied their dielectric proper-ties. The samples were prepared by using a reactive mechanical milling technique on D8000-Spex combined with an annealing at a temperature in the range of 700 ℃ - 1000 ℃. The crystalline structure and the sample's purity were checked by means of X-ray diffraction (XRD) on a SIEMENS D5000 spectrograph. The obtained XRD patterns conrmed that all the samples belonged to the F4K2Ni perovskite layer tetragonal structure with a space group of I4/mmm (139). The grain size of a ceramic sample was estimated based on the Field-emission scanning electron microscopy (FE- SEM) images and was calculated by using the Warren-Averbach method based on the Full Width at Half Maximum (FWHM) of the XRD lines. The results obtained by using the two methods were quite the same. The mean grain size (< D >) of the samples varied from 16.2 nm to 95 nm with the annealing temperature. Dielectric constant (ε) of all the samples was estimated from the capacitance measurement at different temperatures in the frequency range of 1 kHz - 13 MHz. The estimated ε of all the samples was about 105 over the whole frequency range up to 1 MHz. The temperature and the frequency dependences of ε(f T), the dielectric constant, were observed and are discussed for all the samples. We have manufactured ceramic samples of La1.5Sr0.5NiO₄and studied their dielectric proper-ties. The samples were prepared by using a reactive mechanical milling technique on D8000-Spex combined with an annealing at a temperature in the range of 700 ℃ - 1000 ℃. The crystalline structure and the sample's purity were checked by means of X-ray diffraction (XRD) on a SIEMENS D5000 spectrograph. The obtained XRD patterns conrmed that all the samples belonged to the F4K2Ni perovskite layer tetragonal structure with a space group of I4/mmm (139). The grain size of a ceramic sample was estimated based on the Field-emission scanning electron microscopy (FE- SEM) images and was calculated by using the Warren-Averbach method based on the Full Width at Half Maximum (FWHM) of the XRD lines. The results obtained by using the two methods were quite the same. The mean grain size (< D >) of the samples varied from 16.2 nm to 95 nm with the annealing temperature. Dielectric constant (ε) of all the samples was estimated from the capacitance measurement at different temperatures in the frequency range of 1 kHz - 13 MHz. The estimated ε of all the samples was about 105 over the whole frequency range up to 1 MHz. The temperature and the frequency dependences of ε(f T), the dielectric constant, were observed and are discussed for all the samples.

Lateral resistance of cross-laminated timber shear wall under cyclic loading

Tran-Dang, Khai(트란 당 카이),Pang, Sung-Jun(방성준),Jeong, Gi Young(정기영) 대한건축학회 2018 대한건축학회 학술발표대회 논문집 Vol.38 No.2

Electronic structure and magnetic properties of BaTi_1-xMn_xO₃

Dang, N.V.,Dang, N.T.,Ho, T.A.,Tran, N.,Phan, T.L. Elsevier 2018 CURRENT APPLIED PHYSICS Vol.18 No.2

<P>The electronic structure and magnetic properties of polycrystalline BaTi1-xMnxO3 (x = 0-0.1) compounds prepared by solid-state reactions were studied. The results revealed that the increase in Mn content (x) did not change the oxidation numbers of Ba (+2) and Ti (+4) in BaTi1-xMnxO3. However, there is the change in Mn valence that Mn-3+,Mn-4+ ions coexist in the samples with x = 0.01-0.04 while Mn4+ ions are almost dominant in the samples with x = 0.06-0.1. We also point out that Mn3+ and Mn4+ ions substitute for Ti4+ and prefer locating in the tetragonal and hexagonal BaTiO3 structures, respectively, in which the hexagonal phase constitutes soon as x = 0.01. Particularly, all the samples exhibit room-temperature ferromagnetism. Ferromagnetic order increases with increasing x from 0 to 0.02, but decreases as x >= 0.04. We think that ferromagnetism in BaTi1-xMnxO3 is related to lattice defects and/or exchange interactions between Mn3+ and Mn4+ ions. (C) 2017 Elsevier B.V. All rights reserved.</P>

Magnetocaloric Effect and Critical Behavior of <inline-formula> <tex-math notation='TeX'> <tex> ${\rm Ni}_{42}{\rm Ag}_{8}{\rm Mn}_{37}{\rm Sn}_{13}$ </tex> </tex-math></inline-formula> Alloys

Tran Dang Thanh,Phan, T. L.,Pham Thi Thanh,Nguyen Hai Yen,Nguyen Huy Dan,Yu, S. C. IEEE 2014 IEEE transactions on magnetics Vol.50 No.4

<P>This paper presents the magnetocaloric effect and critical behavior of alloy ingot and ribbon samples of Ni<SUB>50</SUB>Mn<SUB>37</SUB>Sn<SUB>13</SUB> doped with 8% Ag, which were prepared by an arc-melting and rapidly quenched melt-spinning methods, respectively. Experimental results reveal that a partial replacement of Ag for Ni leads to stamping out the antiferromagnetic martensitic phase. This means that there is only the austenitic phase with a ferromagnetic-paramagnetic (FM-PM) phase-transition temperature of T<SUB>C</SUB> ≈ 295 K. Detailed studies and analyses around the phase transition region prove both samples undergoing a second-order magnetic phase transition. Basing on magnetic field dependences of magnetization, we have determined the magnetic-entropy change (ΔS<SUB>m</SUB>) of the samples. Under a field change of 10 kOe, the maximum magnetic-entropy change (|ΔS<SUB>max</SUB>|) reaches values 0.54 and 0.69 J · kg<SUP>-1</SUP> · K<SUP>-1</SUP> for the alloy ingot and ribbon, respectively. Using Landau's phase-transition theory, and careful analyses of the magnetic data around the FM-PM transition region, we have determined the critical parameters (T<SUB>C</SUB>, β, γ, and δ) in the low field range (below 10 kOe) with T<SUB>C</SUB> = 294.8 K, β = 0.469 ± 0.011, γ = 1.149 ± 0.060, and δ = 3.4 ± 0.1 for the alloy ingot, and with T<SUB>C</SUB> = 294.4 K, β = 0.449 ± 0.005, γ = 1.319 ± 0.040, and δ = 3.9 ± 0.1 for the alloy ribbon. One can see that β values fall in between those expected for the 3-D Heisenberg model (β = 0.365) and mean-field theory (β = 0.5). This indicates a coexistence of short-range and long-range FM interactions in both the samples. The nature of changes in value related to the critical parameters and maximum ΔS<SUB>m</SUB> is thoroughly discussed by means of structural analyses.</P>

Second-Order Phase Transition and the Magnetocaloric Effect in <inline-formula> <tex-math notation='TeX'> <tex> ${\rm La}_{{0.7}}{\rm Ca}_{0.3-{x}}{\rm Sr}_{x}{\rm MnO}_{{3}}$ </tex> </tex-math></inline-formula> Nanoparticles

Tran Dang Thanh,Phan, T. L.,Nguyen Van Chien,Do Hung Manh,Yu, S. C. IEEE 2014 IEEE transactions on magnetics Vol.50 No.4

<P>In this paper, we present a detailed study of the magnetocaloric effect and critical properties around the ferromagnetic-paramagnetic (FM-PM) phase transition of La<SUB>0.7</SUB>Ca<SUB>0.3-x</SUB>Sr<SUB>x</SUB>MnO<SUB>3</SUB> nanoparticles with x = 0.10, 0.11, and 0.12. The samples were synthesized by a combination of reactive milling and thermal processing. The average crystallite size of nanoparticles estimated from the linewidth of X-ray diffraction peaks by using the Williamson-Hall method is about 50 nm. Under a magnetic field change of 10 kOe, the maximum magnetic entropy change (|ΔS<SUB>max</SUB>|) reaches values of 1.47, 1.42, and 1.38 J·kg<SUP>-1</SUP>·K<SUP>-1</SUP> for x = 0.10, 0.11, and 0.12, respectively, at around 300 K. The refrigerant capacity is thus in between 44 and 54 J·kg<SUP>-1</SUP>. Particularly, the M<SUP>2</SUP> versus H/M curves prove that all the samples exhibit a second-order magnetic phase transition. Based on Landau's phase-transition theory and careful analyses of the magnetic data around the FM-PM transition region, we have determined the critical exponents β, y, δ, and T<SUB>C</SUB>. Here, the β values obtained are 0.397, 0.453, and 0.456 for x = 0.10, 0.11, and 0.12, respectively, which are in between those expected on the basis of the mean-field theory (β = 0.5) and value of the 3-D Heisenberg model (β = 0.365). The result proves the coexistence of shortand long-range FM interactions in La<SUB>0.7</SUB>Ca<SUB>0.3-x</SUB>Sr<SUB>x</SUB>MnO<SUB>3</SUB> nanoparticles. The nature of this phenomenon is discussed thoroughly.</P>

Chemical vapor deposition in fabrication of robust and highly efficient perovskite solar cells based on single-walled carbon nanotubes counter electrodes

Tran, Van-Dang,Pammi, S.V.N.,Dao, Van-Duong,Choi, Ho-Suk,Yoon, Soon-Gil Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.747 No.-

<P><B>Abstract</B></P> <P>This study presents a strategy of fabricating a perovskite layer through chemical vapor deposition (CVD) method and applying it as an efficient absorber in PSCs based on SWCNT counter electrode. As the results, the CVD method produced smooth and void-free perovskite films, which reduced the moisture absorption at the grain boundaries then delayed the degradation of the organic/inorganic composition. Furthermore, the smooth surface of the dye layer enhances charge collection at the interface with counter electrodes. Thus, the efficiency of cell fabricated by CVD method was 7.9%, which is improved by 29.5% as compared with cells using the conventional spin-coating method. Furthermore, the cell fabricated by CVD method gave an excellent stability. Accordingly, the efficiency was lost only 17% after 500 h performances. This approach could pave the way to develop low-cost PSCs with long-term stability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Smooth surface with grain size upon 2 μm of MAPbI<SUB>3</SUB> via CVD. </LI> <LI> Degradation of MAPbI<SUB>3</SUB> films by moisture absorption depends on surface morphology. </LI> <LI> Single-wall carbon nanotube for hybrid hole-transporter and counter electrode. </LI> <LI> A small linear efficiency loss of SWCNT-based devices under illumination of 500 h. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Dynamic Collaborative Task Offloading for Delay Minimization in the Heterogeneous Fog Computing Systems

Tran, Hoa Dang,Kim, Dong-Seong 한국통신학회 2023 Journal of communications and networks Vol.25 No.2

Fog computing systems have been widely integratedin IoT-based applications to improve quality of services (QoS)such as low response service delays. This improvement is enabledby task offloading schemes, which perform task computation nearthe task generation sources (i.e., IoT devices) on behalf of remotecloud servers. However, reducing delay remains challenging foroffloading strategies owing to the resource limitations of fogdevices. In addition, a high rate of task requests combined withheavy tasks (i.e., large task size) may cause a high imbalance ofthe workload distribution among the heterogeneous fog devices,which severely impacts the offloading performance in terms ofdelay. To address these issues, this paper proposes a dynamiccollaborative task offloading (DCTO) approach, which is basedon the resource states of fog devices, to dynamically derive thetask offloading policy. Accordingly, a task can be executed byeither a single fog or multiple fog devices through the parallelcomputation of subtasks to reduce the task execution delay. Through extensive simulation analysis, the proposed offloadingsolution showed potential advantages in reducing the averagedelay significantly in systems with a high rate of service requestsand heterogeneous fog environment compared with the existingsolutions. In addition, the proposed scheme can be implementedonline owing to its low computational complexity compared withthe algorithms proposed in related works

AC and DC Conductivity of Multiferroic La2-xSrxNiO4+??

Tran Dang Thanh,Le Van Hong 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5

The DC and AC, up to 1 MHz, conductivity, the thermo-magnetization and the magnetic hysteresis of the La2..xSrxNiO₄+δ polycrystalline ceramic were measured and estimated over a wide temperature range from 20 K to 300 K. The obtained results show that La2..xSrxNiO₄+δ is multiferroic. In the DC region measurement the samples exhibit a semiconductor-like behavior with the activation energy decreasing with increasing Sr concentration. Clear evidence of charge ordering and spin ordering are observed around temperatures of 75 K and 200 K in samples doped with Sr at concentrations below 15 % (x < 0:3). The AC conductivity exhibits a change in conducting behavior at a peak temperature, Tp, near Tco and depends on frequency, which should be related to a change in the stripe structure of the nickelate, as well as to the multiferroic behavior of this material. The DC and AC, up to 1 MHz, conductivity, the thermo-magnetization and the magnetic hysteresis of the La2..xSrxNiO₄+δ polycrystalline ceramic were measured and estimated over a wide temperature range from 20 K to 300 K. The obtained results show that La2..xSrxNiO₄+δ is multiferroic. In the DC region measurement the samples exhibit a semiconductor-like behavior with the activation energy decreasing with increasing Sr concentration. Clear evidence of charge ordering and spin ordering are observed around temperatures of 75 K and 200 K in samples doped with Sr at concentrations below 15 % (x < 0:3). The AC conductivity exhibits a change in conducting behavior at a peak temperature, Tp, near Tco and depends on frequency, which should be related to a change in the stripe structure of the nickelate, as well as to the multiferroic behavior of this material.