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Defence technology（防务技术） 2021年第3期17卷 971-986页

作者： trung thanh tran Quoc-Hoa Pham trung nguyen-thoi Department of Mechanics Le Quy Don Technical UniversityHanoiViet Nam Division of Computational Mathematics and Engineering Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityViet Nam

the main purpose of this paper is to present numerical results of static bending and free vibration of functionally graded porous(FGP) variable-thickness plates by using an edge-based smoothed finite element method(ES-FEM) associate with the mixed interpolation of tensorial components technique for the three-node triangular element(MItC3), so-called ES-MItC3. this ES-MItC3 element is performed to eliminate the shear locking problem and to enhance the accuracy of the existing MItC3 element. In the ES-MItC3 element, the stiffness matrices are obtained by using the strain smoothing technique over the smoothing domains formed by two adjacent MItC3 triangular elements sharing an edge. Materials of the plate are FGP with a power-law index(k) and maximum porosity distributions(U) in the forms of cosine functions. the influences of some geometric parameters, material properties on static bending, and natural frequency of the FGP variable-thickness plates are examined in detail.

关键词： Functionally graded porous(FGP)plates Edge-based smoothed finite element method(ES-FEM) Mixed interpolation of tensorial components(MItC) Static bending Free vibration

A combination of damage locating vector method （DLV） and differential evolution algorithm （DE） for structural damage assessment

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Frontiers of Structural and Civil Engineering 2018年第1期12卷 92-108页

作者： t. nguyen-thoi A. tRAN-VIEt N. nguyen-MINH t. VO-DUY V. HO-HUU Division of Computational Mathematics and Engineering Institute for Computational Science Ton Duc Thang University Hochiminh City Vietnam Division of Construction Computation Institute for Computational Science Ton Duc Thang University Hochiminh City Vietnam Faculty of Civil Engineering Ton Duc Thang University Hochiminh City Vietnam

In this study, a two-stage method is presented for identifying multiple damage scenarios. In the first stage, the damage locating vector （DLV） method using normalized cumulative energy （nce） is employed for damage localization in structures. In the second stage, the differential evolution algorithm （DE） is used for damage severity of the structures. In addition, in the second stage, a modification of an available objective function is made for handing the issue of symmetric structures. to verify the effectiveness of the present technique, numerical examples of a 72-bar space truss and a one-span steel portal frame are considered. In addition, the effect of noise on the performance of the identification results is also investigated. the numerical results show that the proposed combination gives good assessment of damage location and extent for multiple structural damage cases.

关键词： damage assessment damage locating vector method (DLV) differential evolution (DE) multiple damagelocation assurance criterion (MDLAC) mode shape error function

Isogeometric analysis for free vibration of bidirectional functionally graded plates in the fluid medium

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Defence technology（防务技术） 2022年第8期18卷 1311-1329页

作者： Quoc-Hoa Pham Phu-Cuong nguyen Van Ke tran trung nguyen-thoi Faculty of Civil Engineering Ho Chi Minh City Open UniversityHo Chi Minh CityViet Nam Faculty of Mechanical Engineering Le Quy Don Technical UniversityHanoiViet Nam Division of Computational Mathematics and Engineering Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityViet Nam

this paper for first time proposes an isogeometric analysis (IGA) for free vibration response of bi-directional functionally graded (BDFG) rectangular plates in the fluid medium. Material properties of the BDFG plate change in both the thickness and length directions via power-law distributions and Mori-tanaka model. the governing equation of motion of BDFG plate in the fluid-plate system is formulated basing on Hamilton's principle and the refined quasi three-dimensional (3D) plate theory with improved function f(z). the fluid velocity potential is derived from the boundary conditions of the fluid-plate system and is used to determine the added mass. the discrete system of equations is derived from the Galerkin weak form and numerically analyzed by IGA. the accuracy and reliability of the proposed solutions are verified by comparing the obtained results with those published in the literature. Moreover, the effects of the various parameters such as the interaction boundary condition, geometric parameter, submerged depth of plate, fluid density, fluid level, and the material volume control coefficients on the free vibration behavior of BDFG plate in the fluid medium are investigated in detail. Some major findings regarding the numerical results are withdrawn in conclusions.

关键词： Contact plate-fluid Refined quasi 3D plate theory Mori-tanaka model Isogeometric analysis Bidirectional functionally graded plate

Predicting the friction angle of clays using a multi-layer perceptron neural network enhanced by yeo-johnson transformation and coral reefs optimization

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第10期16卷 3982-4003页

作者： Libing Yang trung nguyen-thoi trung-tin tran College of Civil Engineering and Architecture Hunan Institute of Science and TechnologyYueyang414006China Laboratory for Applied and Industrial Mathematics Institute for Computational Science and Artificial IntelligenceVan Lang UniversityHo Chi Minh CityViet Nam Faculty of Mechanical-Electrical and Computer Engineering School of TechnologyVan Lang UniversityHo Chi Minh CityViet Nam Department of Information technology Greenwich VietnamFPT UniversityDa Nang550000Viet Nam

the accurate prediction of the friction angle of clays is crucial for assessing slope stability in engineering *** study addresses the importance of estimating the friction angle and presents the development of four soft computing models:YJ-FPA-MLPnet,YJ-CRO-MLPnet,YJ-ACOC-MLPnet,and *** of all,the Yeo-Johnson(YJ)transformation technique was used to stabilize the variance of data and make it more suitable for parametric statistical models that assume normality and equal *** technique is expected to improve the accuracy of friction angle prediction *** friction angle prediction models then utilized multi-layer perceptron neural networks(MLPnet)and metaheuristic optimization algorithms to further enhance performance,including flower pollination algorithm(FPA),coral reefs optimization(CRO),ant colony optimization continuous(ACOC),and cuckoo search algorithm(CSA).the prediction models without the YJ technique,***-MLPnet,CRO-MLPnet,ACOC-MLPnet,and CSA-MLPnet,were then compared to those with the YJ technique,***-FPA-MLPnet,YJ-CRO-MLPnet,YJ-ACOC-MLPnet,and *** these,the YJ-CRO-MLPnet model demonstrated superior reliability,achieving an accuracy of up to 83%in predicting the friction angle of clay in practical engineering *** improvement is significant,as it represents an increase from 1.3%to approximately 20%compared to the models that did not utilize the YJ transformation technique.

关键词： Natural hazards Slope stability Friction angle Clay Soft computing models Geotechnical engineering

Free vibration analysis of functionally graded porous curved nanobeams on elastic foundation in hygro-thermo-magnetic environment

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Frontiers of Structural and Civil Engineering 2023年第4期17卷 584-605页

作者： Quoc-Hoa PHAM Parviz MALEKZADEH Van Ke tRAN trung nguyen-thoi Faculty of Engineering and technology Nguyen Tat Thanh UniversityHo Chi Minh City 700000Vietnam Department of Mechanical Engineering Persian Gulf UniversityBushehr ***Iran Faculty of Mechanical Engineering Le Quy Don Technical UniversityHanoi 100000Vietnam Laboratory for Applied and Industrial Mathematics Institute for Computational Science and Artificial IntelligenceVan Lang UniversityHo Chi Minh City 700000Vietnam Faculty of Mechanical-Electrical and Computer Engineering School of TechnologyVan Lang UniversityHo Chi Minh City 700000Vietnam Bualuang ASEAN Chair Professor Thammasat School of EngineeringThammasat UniversityPathumtani 12120Thailand

Herein,a two-node beam element enriched based on the Lagrange and Hermite interpolation function is proposed to solve the governing equation of a functionally graded porous(FGP)curved nanobeam on an elastic foundation in a hygro–thermo–magnetic *** material properties of curved nanobeams change continuously along the thickness via a power-law distribution,and the porosity distributions are described by an uneven porosity *** effects of magnetic fields,temperature,and moisture on the curved nanobeam are assumed to result in axial loads and not affect the mechanical properties of the *** equilibrium equations of the curved nanobeam are derived using Hamilton’s principle based on various beam theories,including the classical theory,first-order shear deformation theory,and higher-order shear deformation theory,and the nonlocal elasticity *** accuracy of the proposed method is verified by comparing the results obtained with those of previous reliable ***,the effects of different parameters on the free vibration behavior of the FGP curved nanobeams are investigated comprehensively.

关键词： functionally graded porous material curved nanobeam hygro-thermo-magnetic enriched finite element method

Ensemble machine learning models based on Reduced Error Pruning tree for prediction of rainfall-induced landslides

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International Journal of Digital Earth 2021年第5期14卷 575-596页

作者： Binh thai Pham Abolfazl Jaafari trung nguyen-thoi tran Van Phong Huu Duy nguyen Neelima Satyam Md Masroor Sufia Rehman Haroon Sajjad Mehebub Sahana Hiep Van Le Indra Prakash Division of Computational Mathematics and Engineering Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityViet Nam Research Institute of Forests and Rangelands Agricultural ResearchEducationand Extension Organization(AREEO)TehranIran Institute of Geological Sciences Vietnam Academy of Sciences and TechnologyHanoiViet Nam Faculty of Geography V.N.U.University of ScienceVietnam National UniversityHanoiViet Nam Discipline of Civil Engineering Indian Institute of Technology IndoreMadhya PradheshIndia Department of Geography Jamia Millia IslamiaNew DelhiIndia School of Environment Education and DevelopmentUniversity of ManchesterManchesterUK Institute of Research and Development Duy Tan UniversityDa NangViet Nam DDG(R)Geological Survey of India GujaratIndia

In this paper,we developed highly accurate ensemble machine learning models integrating Reduced Error Pruning tree(REPt)as a base classifier with the Bagging(B),Decorate(D),and Random Subspace(RSS)ensemble learning techniques for spatial prediction of rainfallinduced landslides in the Uttarkashi district,located in the Himalayan range,*** do so,a total of 103 historical landslide events were linked to twelve conditioning factors for generating training and validation *** Mean Square Error(RMSE)and Area Under the receiver operating characteristic Curve(AUC)were used to evaluate the training and validation performances of the *** results showed that the single REPt model and its derived ensembles provided a satisfactory accuracy for the prediction of *** D-REPt model with RMSE=0.351 and AUC=0.907 was identified as the most accurate model,followed by RSS-REPt(RMSE=0.353 and AUC=0.898),B-REPt(RMSE=0.396 and AUC=0.876),and the single REPt model(RMSE=0.398 and AUC=0.836),*** prominent ensemble models proposed and verified in this study provide engineers and modelers with insights for development of more advanced predictive models for different landslide-susceptible areas around the world.

关键词： Machine learning ensemble modeling Bagging Decorate Random Subspace

Green synthesis of three-dimensional magnesium ferrite/titanium dioxide/reduced graphene from Garcinia mangostana extract for crystal violet photodegradation and antibacterial activity

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Journal of Semiconductors 2023年第12期44卷 111-124页

作者： tong Hoang Lin Che Quang Cong nguyen thanh Hoai Nam Hoang An nguyen Duy Hai ton that Buu thoi Le Nhat Binh Hoang Le Minh Lam thanh Ngan Hoang thuy Kim Ngan Du Chi Vi ta Dang Khoa nguyen Huu Hieu VNU-HCM Key Laboratory of Chemical Engineering and Petroleum Processing(Key CEPP Lab)Ho Chi Minh City University of Technology(HCMUT)268 Ly Thuong Kiet StreetDistrict 10Ho Chi Minh CityVietnam Faculty of Chemical Engineering Ho Chi Minh City University of Technology(HCMUT)268 Ly Thuong Kiet StreetDistrict 10Ho Chi Minh CityVietnam Vietnam National University Ho Chi Minh City(VNU-HCM) Linh Trung WardThu Duc CityVietnam

In this study,three-dimensional porous magnesium ferrite/titanium dioxide/reduced graphene oxide(Mg Fe_2O_(4)-GM/tiO_(2)/rGO(MGtG))was successfully synthesized via green and hydrothermal-supported co-precipitation methods using the extract of Garcinia mangostana(***)as a reducing *** characterization results indicate the successful formation of the nano/micro Mg Fe_(2)O_(4)(MFO)and tiO_(2) on the structure of the reduced graphene oxide(rGO),which can also act as efficient support,alleviating the agglomeration of the nano/micro MFO and tiO_(2).the synergic effects of the adsorption and photodegradation activity of the material were investigated according to the removal of crystal violet(CV)under ultraviolet *** effects of catalyst dosage,CV concentration,and p H on the CV removal efficiency of the MGtG were also *** to the results,the CV photodegradation of the MGtG-200 corresponded to the pseudo-first-order kinetic *** reusability of the material after 10 cycles also showed a removal efficiency of 92%.this happened because the materials can easily be recollected using external *** addition,according to the effects of different free radicals·O_(2)^(-),h^(+),and·OH on the photodegradation process,the photocatalysis mechanism of the MGtG was also thoroughly *** antibacterial efficiency of the MGtG was also evaluated according to the inhibition of the Gram-positive bacteria strain Staphylococcus aureus(***).Concurrently,the antibacterial mechanism of the fabricated material was also *** results confirm that the prepared material can be potentially employed in a wide range of applications,including wastewater treatment and antibacterial activity.

关键词： magnesium ferrite titanium dioxide reduced graphene oxide Garcinia mangostana photodegradation antibacterial

基于越南岘港市的高模量沥青路面抗车辙综合技术

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基于越南岘港市的高模量沥青路面抗车辙综合技术

作者：杜维时（DO DUY thoi）东南大学

学位级别：硕士

近几年来越南把对车辙病害的防治作为建设高质量沥青路面中重要解决的问题。本文针对越南岘港市公路车辙病害的实际情况,基于高模量沥青混凝土（HMAC）技术,研究HMAC在岘港市沥青路面抗车辙技术可行性,设计多种HMAC混合料,并对其关键路... 详细信息

近几年来越南把对车辙病害的防治作为建设高质量沥青路面中重要解决的问题。本文针对越南岘港市公路车辙病害的实际情况,基于高模量沥青混凝土（HMAC）技术,研究HMAC在岘港市沥青路面抗车辙技术可行性,设计多种HMAC混合料,并对其关键路面性能与含HMAC结构的路面结构永久变形发展规律进行评估。本文对越南岘港市典型道路使用环境、路面病害状况等进行了调研分析,在此基础上,针对HMAC的功能要求,优选了 AP-8与tPS两种改性剂制备改性沥青混合料,研究了改性剂掺量对高模量沥青混合料的高、低温性能、抗水损性能及疲劳寿命等关键路面性能的影响,得到了两种改性剂在不同掺量的高模量沥青混合料关键路用性能玫瑰图,结合岘港市典型道路的使用环境提出了适用于越南岘港市的高模量改性沥青混合料类型,最后,运用有限元分析工具对两种改性沥青混凝土结构在一定荷载作用下的永久变形进行了评价。研究结果表明,本文设计的高模量改性沥青混合料性能与添加剂掺量有密切关系。随着AP-8与tPS两种改性剂的掺量增大,高模量改性沥青混合料的各项路用性能均有所提高与具有一致规律性。其中,AP-8改性剂对沥青混合料的高、低温性能、水稳定性能、抗变形性能的改善明显优于tPS改性剂,但改性剂tPS对沥青混合料疲劳性能的改善优于改性剂AP-8。本研究建议,使用掺量0.3%的AP-8或者0.7%的tPS改性剂的沥青混合料路用性能更适合越南的路面设计。在越南高温多雨状况下,本研究的高模量改性沥青混合料能够有效解决、改善车辙等路面病害。通过ABAQUS软件建立有限元模型,对两种结构方案（方案1:AP-8改性沥青混合料做上面层。方案2:tPS改性沥青混合料做上面层）的永久变形与应力分析计算结果可以看出,使用AP-8改性沥青混合料的路面结构在抗变形能力与受力情况都优于使用tPS改性沥青混合料的路面结构。

关键词：车辙高模量沥青混合料 AP-8改性剂 tPS改性剂路用性能有限元模型评价

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A LEttER HOME

China Report ASEAN 2021年第Z1期6卷 49-49页

作者： thoi Hoang Phuoc

A Vietnamese student describes his longing for Beijing A year has passed since I left Beijing. Did the autumn winds blow away my memories of the city? Has the snow frozen the group photos taken with my friends last year? I am missing you, Beijing. How have you been?Only four hours on a flight would take me to the largest city in my mind. the memories from my first landing in Beijing remain vivid.

关键词：

A LEttER HOME--A Vietnamese student describes his longing for Beijing

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China Report ASEAN 2021年第1期6卷 49-49页

作者： thoi Hoang Phuoc 不详

Ayear has passed since I left *** the autumn winds blow away my memories of the city?Has the snow frozen the group photos taken with my friends last year?I am missing you,*** have you been?Only four hours on a flight would take me to the largest city in my *** memories from my first landing in Beijing remain *** was September,and I thought Beijing would already have snow,so I wore a winter *** it was sunny and *** on the street seemed to think I had just returned from a trip to the *** was my first trip abroad,so everything was very fresh,but I also felt small and *** the trip from the airport to the school,I only exchanged a few words with the driver.I was closed off not only by inability to speak Chinese,but also due to an introverted *** has always been a little difficult for me to communicate with *** trees along the way gently swayed as if they were welcoming my arrival,and the journey seemed *** scenery outside the car window brought all kinds of emotions to my heart,and I started recalling voices from my family:Why spend four years of your youth away from us?Who will you turn to if you get in trouble?

关键词： airport outside Vietnam