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Cuong-Le, Thanh,Nguyen, Khuong D.,Le-Minh, Hoang,Phan-Vu, Phuong,Nguyen-Trong, Phuoc,Tounsi, Abdelouahed Techno-Press 2022 Advances in nano research Vol.12 No.5
This study explores the linear and nonlinear solutions of sigmoid functionally graded material (S-FGM) nanoplate with porous effects. A size-dependent numerical solution is established using the strain gradient theory and isogeometric finite element formulation. The nonlinear nonlocal strain gradient is developed based on the Reissner-Mindlin plate theory and the Von-Karman strain assumption. The sigmoid function is utilized to modify the classical functionally graded material to ensure the constituent volume distribution. Two different patterns of porosity distribution are investigated, viz. pattern A and pattern B, in which the porosities are symmetric and asymmetric varied across the plate's thickness, respectively. The nonlinear finite element governing equations are established for bending analysis of S-FGM nanoplates, and the Newton-Raphson iteration technique is derived from the nonlinear responses. The isogeometric finite element method is the most suitable numerical method because it can satisfy a higher-order derivative requirement of the nonlocal strain gradient theory. Several numerical results are presented to investigate the influences of porosity distributions, power indexes, aspect ratios, nonlocal and strain gradient parameters on the porous S-FGM nanoplate's linear and nonlinear bending responses.
Le, Minh-Quoc Cuong,Cao, Xuan Thang,Lee, Won Ki,Hong, Seong-Soo,Lim, Kwon Taek Taylor & Francis Inc. 2017 Molecular Crystals and Liquid Crystals Vol.644 No.1
<P>The hybrid material of magnetic graphene oxide (MNPs/GO) was prepared with a facile route and adsorption properties for removal of methylene blue (MB) were investigated. Initially, the surface of magnetic nanoparticles (MNPs) was modified with poly(glycidyl methacrylate) by the surface-initiated reversible addition fragmentation chain transfer (RAFT) polymerization. The modified MNPs and graphene oxide (GO) were fabricated to form MNPs/GO in N, N-dimethylformamide at 60 degrees C. The composites were characterized by using XRD, SEM, TEM, and vibrating sample magnetometry analyses. The adsorptive removal of MB on the adsorbent obeyed a pseudo-second-order kinetic whose equilibrium data were fitted well to the Langmuir isotherm model and the maximum MB uptake of MNPs/GO was estimated from this model to be 153.85 mg/g. MNPs/GO adsorbent could be recycled and maintained 75.3% of its initial adsorption capacity for MB after five regeneration cycles.</P>
Van Minh Hoang,오주환,Bao Ngoc Nguyen,Le Minh Dat,이종구,Thi Giang Huong Tran,Van Huy Nguyen,이승표,방경숙,조영태,김선영,이화영,Quang Cuong Le,Narshil Choi,Thai Son Dinh,Ngoc Hoat Luu 대한의학회 2019 Journal of Korean medical science Vol.34 No.5
Background: In order to provide essential scientific evidence on the population's health status and social health determinants as well as the current capacity of the health care system in Vietnam to health policy makers and managers, Vietnam Ministry of Health, Hanoi University of Public Health, Hanoi Medical University, and Ho Chi Minh University of Medicine and Pharmacy collaborated with Seoul National University (Korea) and conducted a health system survey in the Quoc Oai district (of Hanoi capital) that represented northern rural Vietnam. Methods: The study design was a cross-sectional study. The survey covered different topics (more than 200 questions) and was administered in three separate questionnaires: 1) Basic information of all household members; 2) Household characteristics; and 3) Individual characteristics. Socio-demographic characteristics among the households and individuals were collected from 2,400 households sampled by multi-stage cluster sampling method: more than 200 questions. Results: The household size of Quoc Oai was larger than the national average and there was no significant difference in gender composition. In addition, the proportions of pre-elderly, age 55–64, and elderly group (65 years old and over) were higher than the national population statistics. In this context, demographic transition has begun in Quoc Oai. Conclusion: This study design description provides the basic information about a baseline survey of a future prospective cohort (as a part of a collaborative project on strengthening the health system in Vietnam) to the prospective data user of this survey.
Cuong, Hoang Ba,Le, Ngoc Minh,Jeong, Sang-Hun,Lee, Byung-Teak Elsevier 2017 Journal of alloys and compounds Vol.709 No.-
<P><B>Abstract</B></P> <P>It has been suggested in this study that the Mg content, band-gap energy, and structural phase in the sputter deposited ZnMgO films could be tailored in a wide range by simply controlling the growth temperature and sputtering ambient. The Mg content in film and the band-gap energy showed a strong dependence on the growth temperature and sputtering ambient, increasing with the growth temperature or decreasing by an oxygen addition into the plasma ambient. In this work, the wurtzite ZnMgO film with a wide band gap of 4.53 eV and a high Mg content of X<SUB>Mg</SUB> = 0.53 could be realized for the first time by sputtering the Zn<SUB>0.7</SUB>Mg<SUB>0.3</SUB>O alloy targets with Mg contents of 0.3–0.35 below 200 °C and under pure Ar ambient. From the dependence of the structural phase on the growth temperature, the solubility limit of Mg in the wurtzite ZnMgO single phase without phase segregation was estimated to be about 0.53–0.56 and confirmed to reduce with the growth temperature, possibly due to the lower formation Gibbs free energy of MgO than ZnO and the difference in growth condition.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Tailoring the composition, band-gap, and structural phase of the sputtered ZnMgO film. </LI> <LI> The high Mg solid solubility of 53 mol.% could be realized in wurtzite ZnMgO single phase. </LI> <LI> The higher band-gap of 4.53 eV could be firstly achieved from the wurtzite ZnMgO phase. </LI> <LI> Solid solubility limit of Mg in wurtzite ZnMgO phase reduced with growth temperature. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( Cuong Tu Ho ),( Unno Tatsuya ),( Son Giang Nguyen ),( Thi-hanh Nguyen ),( Son Truong Dinh ),( Son Tho Le ),( Thi-minh-hanh Pham ) 한국미생물생명공학회 2024 Journal of microbiology and biotechnology Vol.34 No.3
Microbial communities in mangrove forests have recently been intensively investigated to explain the ecosystem function of mangroves. In this study, the soil microbial communities under young (< 11 years-old) and old ( >17 years-old) mangroves have been studied during dry and wet seasons. In addition, biogeochemical properties of sediments and methane emission from the two different mangrove ages were measured. The results showed that young and old mangrove soil microbial communities were significantly different on both seasons. Seasons seem to affect microbial communities more than the mangrove age does. Proteobacteria and Chloroflexi were two top abundant phyla showing >15%. Physio-chemical properties of sediment samples showed no significant difference between mangrove ages, seasons, nor depth levels, except for TOC showing significant difference between the two seasons. The methane emission rates from the mangroves varied depending on seasons and ages of the mangrove. However, this did not show significant correlation with the microbial community shifts, suggesting that abundance of methanogens was not the driving factor for mangrove soil microbial communities.
Le, Ngoc Minh,Hoang, Ba Cuong,Lee, Byung-Teak Materials Research Society of Korea 2017 한국재료학회지 Vol.27 No.12
ZnMgBeGaO/Ag/ZnMgBeGaO multilayer structures were sputter grown and characterized in detail. Results indicated that the electrical properties of the ZnMgBeGaO films were significantly improved by inserting an Ag layer with proper thickness (~ 10 nm). Structures with thicker Ag films showed much lower optical transmission, although the electrical conductivity was further improved. It was also observed that the electrical properties of the multilayer structure were sizably improved by annealing in vacuum (~35 % at $300^{\circ}C$). The optimum ZnMgBeGaO(20nm)/Ag(10nm)/ZnMgBeGaO(20nm) structure exhibited an electrical resistivity of ${\sim}2.6{\times}10^{-5}{\Omega}cm$ (after annealing), energy bandgap of ~3.75 eV, and optical transmittance of 65 % ~ 95 % over the visible wavelength range, representing a significant improvement in characteristics versus previously reported transparent conductive materials.
Anti-inflammatory Triterpenes and Glyceryl Glycosides from Kandelia candel (L.) Druce
Le Duc Dat,NGUYEN PHUONG THAO,BUIHUU TAI,Bui Thi Thuy Luyen,양서영,김소현,구정은,고영상,Nguyen The Cuong,Nguyen Hoai Nam,Nguyen Van Thanh,Phan Van Kiem,Chau Van Minh,김영호 한국생약학회 2015 Natural Product Sciences Vol.21 No.3
Phytochemical investigation of Kandelia candel resulted in the isolation of six triterpenes (1 - 5) and two glyceryl glycosides (6 and 7) and their structures were determined by comparing the spectroscopic data with those of reported values. In present study, we described the inhibitory effects of fractions and isolated compounds from K. candel on pro-inflammatory cytokines (IL-12 p40, IL-6, and TNF-a) production in lipopolysaccharide (LPS) stimulated bone marrow-derived dendritic cells (BMDCs). Results indicated that compounds 3, 6, and 7 showed potent inhibition on IL-6 production (IC50 values at less than 0.5 mM, respectively). Meanwhile, compounds 6 and 7 exhibited strong inhibitory effects on the production of TNF-a (IC50 values of 1.7 ? 0.1 and 5.5 ? 0.2 mM). Compounds 1 and 3 were also showed the inhibitory effects on IL-12 p40 production (IC50 values of 8.9 ? 0.4 and 3.3 ? 0.1 mM, respectively).
TOXUAN DINH,Le Khac Thuy,Nguyen Thanh Tien,Tri Dung Dang,Cong Minh Ho,Hoai Vu Anh Truong,Hoang Vu Dao,Tri Cuong Do,안경관 사단법인 유공압건설기계학회 2019 드라이브·컨트롤 Vol.16 No.2
Fuel cell hybrid electric vehicle is an attractive solution to reduce pollutants, such as noise and carbon dioxide emission. This study presents an approach for energy management and control algorithm based on energetic macroscopic representation for a fuel cell hybrid electric vehicle that is powered by proton exchange membrane fuel cell, battery and supercapacitor. First, the detailed model of the fuel cell hybrid electric vehicle, including fuel cell, battery, supercapacitor, DC-DC converters and powertrain system, are built on the energetic macroscopic representation. Next, the power management strategy was applied to manage the energy among the three power sources. Moreover, the control scheme that was based on back-stepping sliding mode control and inversed-model control techniques were deduced. Simulation tests that used a worldwide harmonized light vehicle test procedure standard driving cycle showed the effectiveness of the proposed control method.