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A Cell-Based Smoothed Finite Element Method for Modal Analysis of Non-Woven Fabrics

Computers, Materials & Continua 2021年第6期67卷 2765-2795页

作者： nguyen t.quyen N.Dourado A.J.P.Gomes F.B.N.Ferreira C2t—Centro de Ciência e tecnologia têxtil Departamento de Engenharia TêxtilUniversidade do MinhoCampus de AzurémGuimarães4804-533Portugal CMEMS-UMinho Departamento de Engenharia MecânicaUniversidade do MinhoCampus de AzurémGuimarães4804-533Portugal Department of Computer Science Universidade da Beira InteriorConvento de Sto.AntónioCovilhã6201-001Portugal Instituto de telecomunicações R.Marquês deÁvila e BolamaCovilhã6201-001Portugal

the combination of a 4-node quadrilateral mixed interpolation of tensorial components element(MItC4)and the cell-based smoothed finite element method(CSFEM)was formulated and implemented in this work for the analysis of free vibration and unidirectional buckling of shell *** formulation was applied to numerous numerical examples of non-woven *** CSFEM schemes do not require coordinate transformation,spurious modes and numerical instabilities are prevented using bilinear quadrilateral element subdivided into two,three and four smoothing *** improvement of the original CSFEM formulation was made regarding the calculation of outward unit normal vectors,which allowed to remove the integral operator in the strain smoothing *** procedure conducted both to the simplification of the developed formulation and the reduction of computational cost.A wide range of values for the thickness-to-length ratio and edge boundary conditions were *** developed numerical model proved to overcome the shear locking phenomenon with success,revealing both reduced implementation effort and computational cost in comparison to the conventional FEM *** cell-based strain smoothing technique used in this work yields accurate results and generally attains higher convergence rate in energy at low computational cost.

关键词： Mindlin-Reissner theory of plates shear-locking gradient/strain smoothing technique non-woven fabric

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Scouring of a granular bed by dam break: Experimental study and numerical simulation by a VOF-LPt coupling

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International Journal of Sediment Research 2023年第3期38卷 432-445页

作者： quyen thi Le nguyen Viet Dung nguyen Patrice Coorevits EPROAD Research Unit University of Picardie Jules Verne IUT of Aisne Hanoi University of Civil Engineering

the first part of the research reported here consists of an experimental campaign to study the scouring of a granular bed(glass beads, sand) induced by a dam break in an open channel. two configurations are considered: with and without cylinders. In the second part of this study, the volume of fluid method coupled with the shear stress transport turbulent model and the lagrangian particle tracking method is used to simulate the local scour processes. the four-way coupling is realized by considering the drag force and collisions between particles. Using a vortex map and velocity profiles, the flow dynamics and scour pattern can be studied. the current research also focuses on the profiles of the erodible particle bed and the sediment transport rate to study the effects of a cylinder on local scour. the presence of the cylinder increases the experimental erosion depth by up to 42%. It was found that for relatively close particle diameters(2 and 3 mm), a granular bed with larger porosity(larger diameter) erodes the *** and numerically it was found that the center of the granular bed experiences more erosion compared to the channel sides. In the last part of the research, comparisons between the numerical results and the experimental data allowed risk areas to be identified and the roles of porosity,sediment density, and flow dynamics on erosion to be identified.

关键词： Volume of fluid Lagrangian particle tracking Scour Granular bed Cylinder Dam break

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Development of deep neural network model to predict the compressive strength of FRCM confined columns

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Frontiers of Structural and Civil Engineering 2022年第10期16卷 1213-1232页

作者： Khuong LE-nguyen quyen Cao MINH Afaq AHMAD Lanh Si HO Department of Civil Engineering University of Transport TechnologyHanoi 100000Vietnam Faculty of Arts and Design University of CanberraBruce ACT 2617Australia Department of Civil Engineering University of Engineering and TechnologyTaxila 47080Pakistan Graduate School of Advanced Science and Engineering Hiroshima UniversityHiroshima 739-8527Japan

the present study describes a reliability analysis of the strength model for predicting concrete columns confinement influence with Fabric-Reinforced Cementitious Matrix(FRCM).through both physical models and Deep Neural Network model(artificial neural network(ANN)with double and triple hidden layers).the database of 330 samples collected for the training model contains many important parameters,i.e.,section type(circle or square),corner radius rc,unconfined concrete strength fco,thickness nt,the elastic modulus of fiber Ef,the elastic modulus of mortar *** results revealed that the proposed ANN models well predicted the compressive strength of FRCM with high prediction *** ANN model with double hidden layers(APDL-1)was shown to be the best to predict the compressive strength of FRCM confined columns compared with the ACI design code and five physical ***,the results also reveal that the unconfined compressive strength of concrete,type of fiber mesh for FRCM,type of section,and the corner radius ratio,are the most significant input variables in the efficiency of FRCM confinement *** performance of the proposed ANN models(including double and triple hidden layers)had high precision with R higher than 0.93 and RMSE smaller than 0.13,as compared with other models from the literature available.

关键词： FRCM deep neural networks confinement effect strength model confined concrete

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Antibiofilm activity of alpha-mangostin loaded nanoparticles against Streptococcus mutans

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Asian Pacific Journal of tropical Biomedicine 2020年第7期10卷 325-332页

作者： Phuong t.M.nguyen Minh t.H.nguyen Lien t.Quach Phuong t.M.nguyen Lam L.nguyen Dong V.quyen Institute of Biotechnology Vietnam Academy of Science and Technology18 Hoang Quoc Viet RoadHanoiVietnam Institute of Graduate University of Science and technology Vietnam Academy of Science and Technology18 Hoang Quoc Viet RoadHanoiVietnam University of Science and technology of Hanoi Vietnam Academy of Science and Technology18-Hoang Quoc Viet RoadCau GiayHanoiVietnam

Objective:to investigate the antibiofilm activity of alphamangostin(AMG)loaded nanoparticle(nano AMG)against dental caries pathogen Streptococcus ***:AMG was isolated from the peels of Garcinia mangostana *** silica gel columns and chemically analysed by high performance liquid chromatography and nuclear magnetic *** AMG was prepared using the solvent evaporation method combined with high-speed *** nanoparticles were characterized using dynamic light scattering,field emission scanning electron microscopy(FE-SEM)and Fourier transform infrared spectroscopy(FtIR).the toxicity of nano AMG in fibroblast NIH/3 t3 cell line was determined using Mtt *** antibiofilm effect of nano AMG was determined through the evaluation of biofilm formation by Streptococcus mutans using a 96-well *** biomass was quantified using crystal *** viability was observed under confocal microscopy using LIVE/DEAD Bac Light ***,gene expression was determined by quantitative real-time PCR and membrane permeabilization activity by measuring the uptake of o-nitrophenol-β-***:Nano AMG size was in a range of 10-50 nm with a polydispersity index ofta potential value of-35.2 m *** size and the incorporation of AMG in the nanoparticles were confirmed by FE-SEM and FtIR *** IC50 values of the test agents on NIH/3 t3 cells were(9.80±0.63)μg/m L for AMG and(8.70±0.81)μg/m L for nano AMG,while no toxicity was generated from excipients used to prepare *** the early stage of biofilm formation,treatment with 6.25μmol/L nano AMG caused a reduction in biofilm biomass up to 49.1%,compared to 33.4%for *** contrast,biofilms at the late stage were more resistant to the test *** 96μmol/L(=10×MIC),nano AMG reduced only 20.7%of biofilm biomass while AMG did not showany *** of gtf B and gtf C genes involved in biofilm formation were down-regulated 3.3 and 12.5 folds,res

关键词： Alpha-mangostin Nanoparticle Antibiofilm activity Streptococcus mutans

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Effect of land use change on water discharge in Srepok watershed,Central Highland,Viet Nam

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International Soil and Water Conservation Research 2014年第3期2卷 74-86页

作者： nguyen thi Ngoc quyen nguyen Duy Liem nguyen Kim Loi tay nguyen University Viet Nam.567 Le Duan streetBuon Ma Thuot CityDak Lak Province Nong Lam University Viet Nam.Linh Trung WardThu Duc districtHo Chi Minh City

Srepok watershed plays an important role in Central Highland in Viet *** impacts to developing social-economic ***,it is necessary to research elements which impact to natural resources in this *** Soil and Water Assessment tool(SWAt)model and Geography Information System(GIS)were used to simulate water discharge in the Srepok *** objectives of the research were to apply GIS and SWAt model for simulation water discharge and then,we assessed land use change which impacted on water discharge in the *** observed stream flow data from Ban Don Stream gauge station was used to calibrate for the period from 1981 to 2000 and then validate for the period from 2001 to *** using SWAt-CUP software to calibration,NSI reached 0.63 and R square value achieved 0.64 from 2004 to 2008 in calibration and NSI gained good level at 0.74 and R square got 0.75 from 2009 to 2012 in validation step at Ban Don *** that,land cover in 2010 was processed like land cover in 2000 and set up SWAt model *** simulated water discharge in scenario 1(land use 2000)was compared with scenario 2(land use 2010),the simulation result was not significant difference between two scenarios because the change of area of land use was not much enough to affect the fluctuation of water ***,the effect of land cover on water resource could be seen clearly via total water *** percentage of surface flow in 2000 was twice times more than in 2010;retard and base flow in 2000 was slightly more than in ***,decreased surface flow,increased infiltration capacity of water and enriched base flow resulted in the growth of land cover.

关键词： Water discharge Land use change GIS SWAt model Simulations

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Data driven discovery of conjugated polyelectrolytes for optoelectronic and photocatalytic applications

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npj Computational Materials 2021年第1期7卷 641-649页

作者： Yangyang Wan Fernando Ramirez Xu Zhang thuc-quyen nguyen Guillermo C.Bazan Gang Lu Department of Physics and Astronomy California State University NorthridgeNorthridgeCaliforniaUSA Department of Chemistry and Biochemistry University of CaliforniaSanta BarbaraCaliforniaUSA

Conjugated polyelectrolytes(CPEs),comprised of conjugated backbones and pendant ionic functionalities,are versatile organic materials with diverse ***,the myriad of possible molecular structures of CPEs render traditional,trial-and-error materials discovery strategy ***,we tackle this problem using a data-centric approach by incorporating machine learning with high-throughput first-principles *** systematically examine how key materials properties depend on individual structural components of CPEs and from which the structure–property relationships are *** means of machine learning,we uncover structural features crucial to the CPE properties,and these features are then used as descriptors in the machine learning to predict the properties of unknown ***,we discover promising CPEs as hole transport materials in halide perovskite-based optoelectronic devices and as photocatalysts for water *** work could accelerate the discovery of CPEs for optoelectronic and photocatalytic applications.

关键词： conjugated backbone photocatalytic

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Spectral contrast optical coherence tomography angiography enables single-scan vessel imaging

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Light(Science & Applications) 2019年第1期8卷 1108-1116页

作者： James A.Winkelmann Aya Eid Graham Spicer Luay M.Almassalha the-quyen nguyen Vadim Backman Department of Biomedical Engineering Northwestern UniversityEvanstonIL 60208USA Department of Chemical and Biological Engineering Northwestern UniversityEvanstonIL 60208USA

Optical coherence tomography angiography relies on motion for contrast and requires at least two data acquisitions per pointwise scanning *** present a method termed spectral contrast optical coherence tomography angiography using visible light that relies on the spectral signatures of blood for angiography from a single scan using endogenous *** demonstrate the molecular sensitivity of this method,which enables lymphatic vessel,blood,and tissue discrimination.

关键词： enable signature spectral

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Stem cell-based therapy for human diseases

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Signal transduction and targeted therapy 2022年第9期7卷 3242-3282页

作者： Duc M.Hoang Phuong t.Pham trung Q.Bach Anh t.L.Ngo quyen t.nguyen trang t.K.Phan Giang H.nguyen Phuong t.t.Le Van t.Hoang Nicholas R.Forsyth Michael Heke Liem thanh nguyen Department of Research and Development Vinmec Research Institute of Stem Cell and Gene TechnologyVinmec Healthcare SystemHanoiVietnam Department of Cellular therapy Vinmec High.Tech CenterVinmec Healthcare SsystemHanoiVietnam Institute for Science&technology in Medicine Keele UniversityKeeleUK a Department of Biology Stanford UniversityStanfordCAUSA

Recent advancements in stem cell technology open a new door for patients suffering from diseases and disorders that have yet to be *** cell-based therapy,including human pluripotent stem cells(hPsCs)and multipotent mesenchymal stem cells(MSCs),has recently emerged as a key player in regenerative *** are defined as self-renewable cell types conferring the ability to differentiate into various cellular phenotypes of the human body,including three germ *** are multipotent progenitor cells possessing self-renewal ability(limited in vitro)and differentiation potential into mesenchymal lineages,according to the International Society for Cell and Gene therapy(ISCt).this review provides an update on recent clinical applications using either hPSCs or MSCs derived from bone marrow(BM),adipose tissue(At),or the umbilical cord(UC)for the treatment of human diseases,including neurological disorders,pulmonary dysfunctions,metabolic/endocrine-related diseases,reproductive disorders,skin burns,and cardiovascular ***,we discuss our own clinical trial experiences on targeted therapies using MsCs in a clinical setting,and we propose and discuss the MSC tissue origin concept and how MSC origin may contribute to the role of MSCs in downstream applications,with the ultimate objective of facilitating translational research in regenerative medicine into clinical *** mechanisms discussed here support the proposed hypothesis that BM-MSCs are potentially good candidates for brain and spinal cord injury treatment,At-MSCs are potentially good candidates for reproductive disorder treatment and skin regeneration,and UC-MsCs are potentially good candidates for pulmonary disease and acute respiratory distress svndrometreatment.

关键词： diseases distress treatment

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Facile synthesis of FeFe2O4 magnetic nanomaterial for removing methylene blue from aqueous solution

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Progress in Natural Science:Materials International 2019年第6期29卷 648-654页

作者： Van-Phuc Dinh Ngoc quyen tran nguyen-Que-tran Le Quang-Huy tran trinh Duy nguyen Gr EEN), nguyen tat thanh University Van tan Le Future Materials and Devices Laboratory Institute of Fundamental and Applied Sciences Duy tan University Institute of Applied Materials Science VASt Graduate University of Science and technology VASt Le Quy Don–LBt Highschool Bien Hoa City Dong Nai province Center of Excellence for Green Energy and Environmental Nanomaterials (CE Industrial University of Ho Chi Minh City

A facile and simple chemical precipitation method was utilized to synthesize FeFe2O4magnetic nanomaterial for removing methylene blue（MB） from aqueous solution. Characterizations of this material were examined by using XRD, SEM, Ft-IR, tGA-DtG and BEt methods. Factors affecting the uptake of methylene blue, including p H, adsorption time, and MB initial concentration were also studied. the measured data were fitted by using four isotherm models including Langmuir, Freundlich, Sips and temkin. Results showed that the Sips model offers the best fit to the data. In addition, the monolayer MB adsorption capacity obtained from the Langmuir model was 42.35 mg g-1under the optimal conditions of p H = 10 and adsorption time = 80 min. In particular, the uptake of MB onto FeFe2O4magnetic nanomaterial obtained from the kinetic and mechanism studies of the adsorption was in good agreement with prediction of the pseudo-first-order model, whereas the electrostatic interaction was found to play a primary mechanism.

关键词： FeFe2O4 magnetic nanomaterial Adsorption Methylene blue Adsorption mechanism

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Chebyshev polynomial-based Ritz method for thermal buckling and free vibration behaviors of metal foam beams

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Applied Mathematics and Mechanics(English Edition) 2024年第5期45卷 891-910页

作者： N.D.nguyen t.N.nguyen Faculty of Civil Engineering Ho Chi Minh City University of Technology and EducationHo Chi Minh City 71309Viet Nam Faculty of Engineering and technology Kien Giang UniversityChau Thanh 92000Viet Nam

this study presents the Chebyshev polynomials-based Ritz method to examine the thermal buckling and free vibration characteristics of metal foam *** analyses include three models for porosity distribution and two scenarios for thermal *** material properties are assessed under two conditions,i.e.,temperature dependence and temperature *** theoretical framework for the beams is based on the higher-order shear deformation theory,which incorporates shear deformations with higher-order *** governing equations are established from the Lagrange equations,and the beam displacement fields are approximated by the Chebyshev *** simulations are performed to evaluate the effects of thermal load,slenderness,boundary condition(BC),and porosity distribution on the buckling and vibration behaviors of metal foam *** findings highlight the significant influence of temperature-dependent(tD)material properties on metal foam beams'buckling and vibration responses.

关键词： Ritz method Chebyshev function buckling vibration metal foam beam higher-order beam theory(HOBt)

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