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Random vibration analysis of FGM plates subjected to moving load using a refined stochastic finite element method

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Defence Technology（防务技术） 2024年第4期34卷 42-56页

作者： Ngoc-Tu Do Trung thanh tran Faculty of Mechanical Engineering Hanoi University of IndustryHanoiViet Nam Faculty of Mechanical Engineering Le Quy Don Technical UniversityHanoiViet Nam

The article introduces a finite element procedure using the bilinear quadrilateral element or four-node rectangular element(namely Q4 element) based on a refined first-order shear deformation theory(rFSDT) and Monte Carlo simulation(MCS), so-called refined stochastic finite element method to investigate the random vibration of functionally graded material(FGM) plates subjected to the moving *** advantage of the proposed method is to use r-FSDT to improve the accuracy of classical FSDT, satisfy the stress-free condition at the plate boundaries, and combine with MCS to analyze the vibration of the FGM plate when the parameter inputs are random quantities following a normal distribution. The obtained results show that the distribution characteristics of the vibration response of the FGM plate depend on the standard deviation of the input parameters and the velocity of the moving ***, the numerical results in this study are expected to contribute to improving the understanding of FGM plates subjected to moving loads with uncertain input parameters.

关键词： FGM Moving load R-FSDT Q4 element Monte Carlo simulation Random vibration

Dynamic response of honeycomb-FGS shells subjected to the dynamic loading using non-polynomial higher-order IGA

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Defence Technology（防务技术） 2024年第7期37卷 149-161页

作者： Pham Binh Le Trung-thanh tran Faculty of Mechanical Engineering Le Quy Don Technical UniversityHanoiViet Nam

The main goal of this study is to use higher-order isogeometric analysis(IGA)to study the dynamic response of sandwich shells with an auxetic honeycomb core and two different functionally graded materials(FGM)skin layers(namely honeycomb-FGS shells)subjected to dynamic ***'s non-polynomial higher-order shear deformation theory(HSDT)is used due to its simplicity and *** governing equation is derived from Hamilton's *** verifying the present approach,the effect of input parameters on the dynamic response of honeycomb-FGS shells is carried out in detail.

关键词： IGA Elastic foundation Dynamic response FGM Auxetic honeycomb Shell

Microorganism Selection and Determination of Mixing Ratio of Selected Strains in the ＂Chao＂ Production

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Journal of Agricultural Science and Technology(B) 2018年第4期8卷 247-252页

作者： tran thi thanh Man Do Chi thinh Department of Food Technology College of Food Industry Da Nang Vietnam

The paper presents the research for the purpose of selecting microorganisms into the production process of ＂chao＂ to improve the quality of ＂chao＂ products and ensure food safety. Several analytical methods such as determination of formal nitrogen, determination of the protease hydrolysis activity, sensory evaluation method, experimental procedure, methods of analysis and processing of empirical data were used in this study. The findings showed that two out of four selected microorganism strains （one strain of fungi and three strains of bacteria denoted NM1, VK1, VK2, VK3, respectively） were the most appropriate for the cooperation among them and the production of %hao＂, which were coded NM1 and VK1. The suitable mixing proportion of strains of NM1 and VK1 was determined at 1：1.25, compatible with the 1：100 ratio of the varieties of microorganisms （in powder form） to tofu.

关键词： Bacteria "chao" fungi tofu.

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越南平阳省工业区纸类企业用工制度比较研究

越南平阳省工业区纸类企业用工制度比较研究

作者： tran thi thanh HUONG 兰州交通大学

学位级别：硕士

随着全球社会进入知识经济和国际一体化时代,世界造纸业的竞争形势也发生了巨大的变化,与此同时随着越南宏观经济的快速发展,越南的造纸业也进入了快速增长的阶段,成为推动越南国民经济快速发展的重要力量。越南造纸业的高速增长吸引了... 详细信息

随着全球社会进入知识经济和国际一体化时代,世界造纸业的竞争形势也发生了巨大的变化,与此同时随着越南宏观经济的快速发展,越南的造纸业也进入了快速增长的阶段,成为推动越南国民经济快速发展的重要力量。越南造纸业的高速增长吸引了大量外国投资者来争夺利润,这给越南本土造纸业的发展带来了巨大的机遇和挑战,同时带给越南的政府和企业借鉴国外优秀企业先进的管理手段和丰富的经验的机会。对一个企业来说,人力资源是构成企业管理的要素之一,人力资源管理被视为企业的战略因素。企业用工制度是人力资源管理的重要部分,做好企业用工制度就是做好企业的人力资源管理。越南本土纸类企业在用工制度方面存在很多问题,还没有很好地实现人力资源的目标。根据以上情况分析,本文对越南平阳省工业区三家纸业公司（上海正隆纸业公司、日本王子制纸公司、越南安平纸业公司）的用工制度进行分析和比较研究。在具体研究中,本文采用理论分析和案例分析相结合的研究方法。首先从劳动关系理论,人力资源管理理论,需要层次理论,双因素理论和公平理论,分析了上海正隆纸业,日本王子纸业,越南安平纸业公司的用工制度的状况,分析各个不同企业的用工制度形式差别。其次,从这三家企业的用工制度在四个方面:从员工招聘,薪酬制定,福利发放和员工培训进行比较。在员工招聘方面,本文比较招聘数量、种类、渠道和招聘流程;在薪酬制定方面,本文将以这三家企业的平均薪酬为基础,利用问卷调查法,运用SPSS软件进行这三家企业的员工对三家企业的薪酬满意度的比较;在福利发放方面,本文将利用问卷调查结果和越南劳动法改革,进行每个企业在福利方面的各个因素的分析和比较;在员工培养方面,本文从企业不同的用工制度模型,分析和比较每个企业的人才培养政策、过程、时间和结果。最后根据三家企业用工制度不同点,提出现存的问题和原因,针对其中存在的问题,从社会和企业两个层面提出具有针对性的一些建议,包括:完善劳动法律法规、优化劳动力市场建设、转变政府职能,以及探索新型用工制度、完善职工权益保护制度、塑造以人为本的企业文化、完善职工培训机制、完善职工薪酬制度、完善职工招聘制度。希望通过本文的研究分析,能够对越南纸类企业用工制度产生积极、有效的影响。

关键词：平阳省纸类企业企业管理用工制度

GLOBAL BOUND ON THE GRADIENT OF SOLUTIONS TO p-LAPLACE TYPE EQUATIONS WITH MIXED DATA

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Acta Mathematica Scientia 2024年第4期44卷 1394-1414页

作者： Minh-Phuong tran The-Quang tran thanh-Nhan NGUYEN Applied Analysis Research Group Faculty of Mathematics and StatisticsTon Duc Thang UniversityHo Chi Minh CityVietnam Nguyen Huu Huan High School Thu Duc CityVietnam Group of Analysis and Applied Mathematics Department of MathematicsHo Chi Minh City University of EducationVietnam

In this paper,the study of gradient regularity for solutions of a class of elliptic problems of p-Laplace type is *** particular,we prove a global result concerning Lorentz-Morrey regularity of the non-homogeneous boundary data problem:-div((s^(2)+|▽u|^(2)p-2/2)▽u)=-div(|f|^(p-2)f)+g inΩ,u=h in■Ω,with the(sub-elliptic)degeneracy condition s∈[0,1]and with mixed data f∈L^(p)(Q;R^(n)),g∈Lp/(p-1)(Ω;R^(n))for p∈(1,n).this problem naturally arises in various applications such as dynamics of non-Newtonian fluid theory,electro-rheology,radiation of heat,plastic moulding and many *** on the idea of level-set inequality on fractional maximal distribution functions,it enables us to carry out a global regularity result of the solution via fractional maximal *** to the significance of M_(α)and its relation with Riesz potential,estimates via fractional maximal functions allow us to bound oscillations not only for solution but also its fractional derivatives of orderα.Our approach therefore has its own interest.

关键词： gradient estimates p-Laplace quasilinear elliptic equation fractional maximal operators Lorentz-Morrey spaces

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广义的汉语春节吉祥语考察

广义的汉语春节吉祥语考察

作者： tran thi thanh VAN（陈氏清云）西北大学

学位级别：硕士

人类在不同的文化环境中,塑造了不同的文化心理。语言是“一种非本能性的,获得的‘文化’功能”,是文化的一种外在表现符号与重要载体,不同民族的语言反映了其民族特定的文化风貌。由于语言具有社会性及人文性每种语言的使用者在学习,... 详细信息

人类在不同的文化环境中,塑造了不同的文化心理。语言是“一种非本能性的,获得的‘文化’功能”,是文化的一种外在表现符号与重要载体,不同民族的语言反映了其民族特定的文化风貌。由于语言具有社会性及人文性每种语言的使用者在学习,使用语言的同时有必要准确地掌握该语言的文化意义。当人们学习母语或交际的双方都是同一个民族的时候,学习者或交际者对语言中所隐含的文化因素往往“习而不察”很少受到各种文化的干扰,因而得以顺利地进行学习和交际。但是当学习者或交际者面对非本民族语言的——第二语言时,受所处文化环境的影响他们对第二语言的理解和使用就可能会产生偏差。从一定程度上说语言交际在本质上即是不同文化的沟通问题。 “吉祥”按其字面意义,就是“吉利”与“祥和”。吉祥语习俗由语言巫术演化而来,是一种历史悠久,使用广泛的人类文化习俗,它象征着人类对好运和幸福的追求。中国素有“礼仪之邦”之称,具有悠久的历史文化,作为语言艺术之一的吉祥语习俗是中华民俗文化的重要组成部分。春节俗称“年节”,是中华民族最隆重的传统节日,是一个象征着团结兴旺,对未来寄托新希望的佳节。汉语春节吉祥语既是汉语的一种特殊语言形式、又是中国的一种特殊文化现象,是中国吉祥语习俗的一个典型代表。对汉语春节吉祥语进行考察,找出汉语吉祥语的内涵、特点、功能、用法等,有助于留学生（当然包括我们越南学生）更好的学习汉语,了解中国文化。这是本文选题的一个重要原因。

关键词：吉祥语春节对联非语言形式

An isogeometric approach for nonlocal bending and free oscillation of magneto-electro-elastic functionally graded nanobeam with elastic constraints

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Frontiers of Structural and Civil Engineering 2024年第9期18卷 1401-1423页

作者： Thu Huong NGUYEN thi Van Ke tran Quoc Hoa PHAM School of Mechanical and Automotive Engineering Hanoi University of IndustryHanoi 100000Vietnam Faculty of Mechanical Engineering Le Quy Don Technical UniversityHanoi 100000Vietnam Faculty of Engineering and Technology Nguyen Tat Thanh UniversityHo Chi Minh City 700000Vietnam

this work uses isogeometric analysis(IGA),which is based on nonlocal hypothesis and higher-order shear beam hypothesis,to investigate the static bending and free oscillation of a magneto-electro-elastic functionally graded(MEE-FG)nanobeam subject to elastic boundary constraints(BCs).The magneto-electric boundary condition and the Maxwell equation are used to calculate the variation of electric and magnetic potentials along the thickness direction of the *** study is innovative since it does not use the conventional boundary ***,an elastic system of straight and torsion springs with controllable stiffness is used to support nanobeams’beginning and end positions,creating customizable *** governing equations of motion of nanobeams are established by applying Hamilton’s principle and IGA is used to determine deflections and natural frequency *** studies were performed to evaluate the convergence and accuracy of the proposed *** from this,the impact of the input parameters on the static bending and free oscillation of the MEE-FG nanobeam is examined in *** findings could be valuable for analyzing and designing innovative structures constructed of functionally graded MEE materials.

关键词： elastic boundary conditions isogeometric analysis nanobeam via nonlocal theory grading of magneto-electro-elastic functions

A comparative study on kinetics and dynamics of two dump truck lifting mechanisms using MATLAB simscape

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Theoretical & Applied Mechanics Letters 2024年第2期14卷 146-156页

作者： Thong Duc Hong Minh Quang Pham Son Cong tran Lam Quang tran Truong thanh Nguyen Faculty of transportation Engineering Ho Chi Minh City University of Technology(HCMUT)Ho Chi Minh City 700000Vietnam Vietnam National University Ho Chi Minh City(VNU-HCM) Ho Chi Minh City 700000Vietnam Industrial Maintenance Training Center Ho Chi Minh City University of Technology(HCMUT)Ho Chi Minh City 700000Vietnam

In this paper,two lifting mechanism models with opposing placements,which use the same hydraulic hoist model and have the same angle of 50°,have been *** mechanical and hydraulic simulation models are established using MATLAB Simscape to analyze their kinetics and dynamics in the lifting and holding *** simulation findings are compared to the analytical calculation results in the steady state,and both methods show good *** the early lifting stage,Model 1 produces greater force and discharges goods in the container faster than Model ***,Model 2 reaches a higher force and ejects goods from the container cleaner than its counterpart at the end lifting *** established simulation models can consider the effects of dynamic loads due to inertial moments and forces generated during the system *** is crucial in studying,designing,and optimizing the structure of hydraulic-mechanical systems.

关键词： Dump truck Lifting mechanism Hydraulic MATLAB Simscape Kinetic dynamic analysis

Influence of different land-use types on selected soil properties related to soil fertility in A Luoi District,Thua thien Hue,Vietnam

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Soil Ecology Letters 2024年第1期6卷 131-140页

作者： Khoa Phuc Nguyen Tan Trong tran Huy Dinh Le Phuong Thuy Nguyen Hien Thao thi Pham Dien thanh Nguyen Ngu Huu Nguyen University of Agriculture and Forestry Hue UniversityHue CityThua Thien Hue 52000Vietnam School of Biotechnology Tan Tao UniversityTan Duc ECityDuc HoaLong An850000Vietnam

Land use type affects the physicochemical properties of *** value of OM and TN is high in acacia *** acidity of soil is considered a serious constraint for *** cash crops are acacia,cassava,banana,rice and *** fertility is affected by land-use types and land management,which exacerbates soil erosion and various other forms of soil degradation in the mountainous regions of *** study was conducted in A Luoi District,Thua thien Hue,Vietnam to identify the effects of land-use types on specific soil physicochemical characteristics related to soil *** physicochemical properties,such as organic matter(OM),total nitrogen(TN),total phosphorous(TP),and K+were significantly affected by land-use *** results showed that the soils were sandy in rice but clay loam for acacia and *** mean bulk density value of acacia soil was significantly greater than that of other *** were higher in the acacia soils than those in the rice,maize,and banana *** OM content was significantly higher in the acacia,cassava,and banana soils than those in the rice and maize *** mean of exchangeable K+in the rice soil was higher compared to those in other soils and was affected by land-use *** high exchangeable acidity content in the soils was probably due to intensive ***,both land use type and management did not affect the CEC ***,the inappropriate land use caused the disturbance of soil physicochemical properties,indicating that the conditions of rice and maize soils are becoming worse than acacia ***,lowering the intensity of cultivation,adopting incorporated soil fertility management,and applying organic fertilizer should preserve the existing conditions and enhance soil properties.

关键词： Land-use types soil characteristics soil frility suitable crop Vietnam