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level excursion analysis of probabilistic quasibrittle fracture

Science China(Technological Sciences) 2020年第7期63卷 1141-1153页

作者： le Jia-Liang Department of Civil Environmentaland Geo-EngineeringUniversity of MinnesotaMinneapolis 55455USA

It has widely been acknowledged that no structures can be designed to be risk free, and therefore reliability analysis plays an essential role in the design of engineering structures. The recent focus has been placed on structures made of brittle heterogenous(a.k.a. quasibrittle) materials, such as ceramics, composites, concrete, rock, cold asphalt mixture, and many more at the microscale. This paper presents a level excursion model for the analysis of probabilistic failure of quasibrittle structures, in which the failure statistics is calculated as a first passage probability. The model captures both the spatial randomness of local material resistance and the random stress field induced by microstructures(e.g. randomly distributed flaws). The model represents a generalization of the classical weakest-link model at the continuum limit and it recovers the classical Weibull distribution as an asymptotic distribution function. The paper discusses two applications of the model. The model is first applied to the strength distribution of polycrystalline silicon(poly-Si) MEMS specimens. It is shown that the model agrees well with the experimentally measured strength distributions of poly-Si MEMS specimens of different sizes. The model predicts a complete size effect curve of the mean structural strength transitioning from a vanishing size effect at the small-size limit to the classical Weibull size effect at the large-size limit. The second application is concerned with the left tail of strength distribution of quasibrittle *** taking into account both random stress and strength fields, the model is used to investigate the origin of the power-law tail distribution of structural strength.

关键词： quasibrittle materials strength distribution first passage analysis Weibull statistics size effect

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Effects of Processing Parameters on Mechanical Properties and Structure of Banana Fiber-Reinforced Composites

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Journal of Renewable Materials 2018年第6期6卷 662-670页

作者： Dan-Thuy Van-Pham minh Tri Nguyen Chanh-Nghiem Nguyen Thi Truc Duyen le Thi Yen Nhu Pham Khai Thinh Nguyen Yukihiro Nishikawa Qui Tran-Cong-Miyata Department of Chemical Engineering Can Tho UniversityCan Tho CityViet Nam Department of Automation Technology Can Tho UniversityCan Tho CityViet Nam Department of Macromolecular Science and Engineering Graduate School of Science and TechnologyKyoto Institute of TechnologyMatsugasakiSakyo-kuKyoto 606-8585Japan

The mechanical properties of unidirectional natural fiber-reinforced composites are generally affected by several processing parameters during compression *** study investigates the effects of processing temperature,time,and pressure on the tensile and flexural properties of acrylonitrile butadiene styrene reinforced by banana fibers.X-ray CT imaging was employed to find the relationship between the mechanical properties and structure of the processed ***,the water absorption of composites was observed and the way in which the mechanical properties evolved after water absorption was *** tensile and flexural properties of the unidirectional banana fiber-reinforced composite were found to be inversely proportional to the *** addition,high-pressure compression molding might result in cracks and floating fibers that would significantly reduce its mechanical *** composite with the highest strength,smallest porosity and lowest water absorption was optimally prepared at T=170℃,t=20 min,and P=100 kg cm^-2.

关键词： Banana fiber composite compression molding porosity X-ray CT

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Studying the stress-suction coupling in soils using an oedometer equipped with a high capacity tensiometer

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Frontiers of Structural and Civil Engineering 2011年第2期5卷 160-170页

作者： Trung Tinh le Yu-Jun CUI Juan Jorge MUÑOZ Pierre DELAGE Anh minh TANG Xiang-Ling LI Ecole des ponts ParisTech Navier/CERMES6-8av.B.PascalCitéDescartesChamps-sur-Marne77455 Marne-la-Vallée cedex 2France The China Three Gorges University Yichang 443002China EURIDICE Group c/o SCK./CENBoeretang 2002400 MolBelgium

In the context of research into deep nuclear waste disposal,various works have concerned the hydromechanical behavior of Boom clay,a stiff plastic clay extracted in the SCK-CEN Underground Research Laboratory near the Mol City(Belgium),at a depth of 223 *** to some amount of smectite minerals in the clay fraction,Boom clay exhibits swelling properties when hydrated under low *** investigate some aspects of the hydromechanical behavior of Boom clay,oedometer compression tests were carried out on samples of Boom clay close to saturation and submitted to an initial *** oedometer compression,the changes in suction with increased vertical stress are monitored by means of a high capacity tensiometer installed at the bottom of the *** aspects related to hydromechanical couplings are examined through the investigation of the changes in suction during oedometer compression,a somewhat delicate and poorly documented experimental approach.A comparison is also made with a completely different soil sample under suction,i.e.a statically compacted unsaturated low plasticity *** technical difficulties typical of this new experimental approach are first described in detail so as to optimize the interpretation of the data *** experiment allows the determination of the point at which suction is changed to positive pressure during *** this point,the ratio between the vertical stress and the change in suction are *** this point,the data show that positive pore pressures are dissipated in a common *** suction/stress behavior during unloading is also described and ***,an interpretation in terms of microstructure effects is provided for both *** experimental approach initiated here seems to provide interesting further application to better understand hydromechanical couplings in natural soils in relation with suction increase during stress release.

关键词： Oedometer tensiometer swelling physicochemical and mechanical effects stress/suction coupling soil plasticity

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Finite Morse Index Solutions of a Nonlinear Schr?dinger Equation

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Acta Mathematica Sinica,English Series 2023年第3期39卷 513-522页

作者： Phuong le Faculty of Economic Mathematics University of Economics and LawHo Chi Minh CityVietnam Vietnam National University Ho Chi Minh CityVietnam

We prove Liouville type theorems for stable and finite Morse index H_(loc)^(1)∩L_(loc)^(∞)solutions of the nonlinear Schrodinger equation -Δu+λ|x|^(a)u=|x|b|^(u)|^(p-1)u in R^(N),where N≥2,λ>0,a,b>-2 and p>1,Our analysis reveals that all stable solutions of the equation must be zero for all p>1,Furthermore,finite Morse index solutions must be zero if N≥3 an p≥(N+2+2b)/(N-2).The main tools we use are integral estimates,a Pohozaev type identity and a monotonicity formula.

关键词： Schrodinger equation Liouville type theorems stable solutions finite Morse index solutions monotonicity formula

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Influence of phytochemicals in piper betle linn leaf extract on wound healing

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Burns & Trauma 2015年第3期3卷 143-150页

作者： le Thi Lien Nguyen Thi Tho Do minh Ha Pham Luong Hang Phan Tuan Nghia Nguyen Dinh Thang Department of Biochemistry and Plant Physiology VNU University of ScienceVietnam National University334 Nguyen Trai St.Thanh Xuan DistrictHanoiVietnam Key laboratory of Enzyme and Protein Technology(KlePT) VNU University of ScienceVietnam National UniversityHanoiVietnam

Background:Wound healing has being extensively investigated over the *** impairment is caused by many reasons including increasing of free-radicals-mediated damage,delaying in granulation tissue formation,reducing in angiogenesis and decreasing in collagen *** facts consequently lead to chronic wound *** betle Linn(Betle)leaves have been folklore used as an ingredient of drugs for cutaneous wound ***,the effect of betle leaf on wound healing is not yet well *** this study,we aimed to investigate the healing efficacy of methanol leaf extract of Piper betle Linn on proliferation of fibroblast NIH3T3 cells as well as full-thickness burn and excision wounds in swiss ***:Scratch wound healing assays were conducted to examine the effects of betle leaf extract on healing activity of fibroblast *** and excision wounds on swiss mouse skins were created for investigating the wound healing progress caused by the betle leaf ***(MDA)was also evaluated to examine the products of lipid hydroperoxide(LPO)under conditions of with or without betle leaf extract ***:The results of this study showed that Piper betle Linn leaf extract in methanol increased proliferation of NIH3T3 cells and promoted wound healing in vitro and in vivo with both burn wound and excision wound *** addition,this extract significant decreased level of malondialdehyde(MDA)in liver of treated-mice compared with that in non-treated ***:Our results suggest that Piper betle Linn can be used as an ingredient in developing natural origin drugs for treatment of cutaneous wounds.

关键词： Piper betle Linn leaf extract Wound healing Malondialdehyde(MDA) Fibroblast(NIH3T3)

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CLASSIFICATION OF SOLUTIONS TO HIGHER FRACTIONAL ORDER SYSTEMS

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Acta Mathematica Scientia 2021年第4期41卷 1302-1320页

作者： Phuong le Faculty of Economic Mathematics University of Economics and LawHo Chi Minh CityVietnam VietnamNational UniversityHo Chi Minh CityVietnam

let 00 for all s,t≥*** main technique we use is the method of moving spheres in integral *** our assumptions are more general than those in the previous literature,some new ideas are introduced to overcome this diffi... 详细信息

let 0lent integral *** classify all such solutions when f(s,t)is nondecreasing in s and increasing in t,g(s,t)is increasing in s and nondecreasing in i,and f(μ^(n-α)s,μ^(n-β)t)/μ^(n-α),g(μ^(n-α)s,μ^(n-β)t)/μ^(n-β)are nonincreasing in μ>0 for all s,t≥*** main technique we use is the method of moving spheres in integral *** our assumptions are more general than those in the previous literature,some new ideas are introduced to overcome this difficulty.

关键词： Higher fractional order system integral system general nonlinearity method of moving spheres classification of solutions

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越南股份制商业银行组织文化对员工组织承诺的影响研究

越南股份制商业银行组织文化对员工组织承诺的影响研究

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作者： le THI minh THUY 湖南大学

学位级别：硕士

越南自加入WTO组织以来,国内各个行业都面临着来自全球激烈的竞争。对于金融界的银行业来说,要想真正面向国际化,直接参与激烈的市场竞争,还面临着很多挑战,赢得动态竞争力的核心在于人才的竞争。在组织获取竞争优势方面,人力资源管理... 详细信息

越南自加入WTO组织以来,国内各个行业都面临着来自全球激烈的竞争。对于金融界的银行业来说,要想真正面向国际化,直接参与激烈的市场竞争,还面临着很多挑战,赢得动态竞争力的核心在于人才的竞争。在组织获取竞争优势方面,人力资源管理是其中的核心战略之一,已经得到了更多人普遍性的关注。组织文化对组织承诺的影响研究,有助于组织在改革与发展中的作用,培育合适的组织文化,加强员工的组织承诺,留住人才,提升组织运作绩效。为了进一步探讨越南股份制商业银行的组织文化对组织承诺的影响,本文从组织文化视角出发,以越南股份制商业银行为研究对象,本文对组织文化对员工组织承诺的影响进行了问卷调查,并对个体特质变量进行了作为中介变量引入的。包含这些内容:第一章是阐述研究背景,目的,内容,方法;第二章是理论基础及相关综述;第三章是组织文化对员工组织承诺的机理分析,然后基于以往的研究理论,本文提出了研究假设;第四章是本文的实证分析,设计和发放问卷调查,应用SPSS22.0数据分析统计分析软件;最后,在数据分析的基础上,提出了研究结论和政策建议。通过理论研究和实证分析,主要得到以下结论:组织物质文化,组织行为文化,组织情深文化这三个维度对员工组织承诺存在显著的正向影响,另外有组织制度文化对员工组织承诺的影响一点也不显著。基于以上的研究结果,本文认为越南股份制商业银行要更大的关注组织文化的建设,完善和丰富,提高组织员工的自豪感,提高员工的组织承诺。

关键词：股份制商业银行组织文化员工组织承诺个人特质变量

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Link between caries,periodontitis,and pregnancy:The role of personalized oral hygiene

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World Journal of Clinical Cases 2025年第6期13卷 51-57页

作者： Melissa Martínez Nieto Martha leticia De león Rodríguez Francisco Javier Alcaraz Baturoni Alma Alicia Soto Chávez Sarah Monserrat LomelíMartínez Periodontics Program Department of Integrated Dentistry ClinicsCentro Universitario de Ciencias de la SaludUniversidad de GuadalajaraGuadalajara 44340Mexico Department of Medical and Life Sciences Centro Universitario de la CiénegaUniversidad de GuadalajaraOcotlán 47810JaliscoMexico Master of Public Health Department of Well-being and SustainableCentro Universitario del NorteUniversidad de GuadalajaraColotlán 46200Mexico

Optimal health during pregnancy is crucial for ensuring the well-being of the mother and the developing *** article is focused on the impact of oral health and the role of personalized oral hygiene management in addressing prevalent dental issues among pregnant women,with particular emphasis on periodontal disease and dental *** the high prevalence of these dental problems and their association with obstetric complications such as pre-term birth and low birth weight,many pregnant women do not receive adequate dental *** gap in care is often due to misconceptions about the safety of dental treat-ments during pregnancy and lack of awareness on the part of healthcare *** of the impacts of oral health and personalization of oral hygiene strategies such as tailored education and support,have proven effective in improving oral health in this *** reductions in the incidence of caries and periodontal disease may be achieved by adapting care to the specific needs of each patient,thereby enhancing maternal and fetal health *** of personalized oral hygiene management into maternal health pro-grams and enhancement of ongoing education for pregnant women and healthcare professionals are essential steps in the reduction of pregnancy-related risks and improvement of maternal and neonatal *** Tip:In this article,we reviewed a recent study on the effects of personalized oral hygiene management on the oral health of pregnant women,as discussed in the article by Men et *** study demonstrated that personalized oral hygiene interventions significantly improved oral health outcomes during pregnancy by reducing the prevalence of dental caries and periodontal *** emphasized the importance of individualized oral care programs that integrate education and tailored support,and we highlighted their significance in enhancing maternal and fetal *** approach underscores the need for

关键词： Pregnancy Periodontal disease Periodontitis Dental caries Oral hygiene

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A Robotics Modeling,Design and Simulation Toolbox in Ptolemy Ⅱ

A Robotics Modeling,Design and Simulation Toolbox in Ptolemy...

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2010 Chinese Control and Decision Conference

作者： ngoc minh le Tung Nguyen Faculty of Computer Science ＆ Computer Engineering Ho Chi Minh City University of TechnologyHo Chi Minh CityVietnam Computer Science Department Wayne State UniversityUSA

＜正＞This paper presents an experimental toolbox for modeling,design and simulation in robotics."Experimental" is understood in the sense that the toolbox is based on an actor-oriented modeling and design environment,i.e.,the PtolemyⅡ***Ⅱsupports system development by a hierarchical refinement of possibly heterogeneous subsystems. Currently the toolbox provides basic features such as the automatic generation of mampulator kinematic and dynamic equations, collision detection,and motion *** toolbox profits naturally from the infrastructure of PtolemyⅡ.

关键词： Robotics Modeling Simulation PtolemyⅡ

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RANDOM ATMOSPHERIC PRESSURE AT THE FREE SURFACE AND MICROSEISMS IN DEEP OCEAN

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Journal of Hydrodynamics 2008年第6期20卷 741-748页

作者： le Jia-chun Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China

A general stochastic model of the atmospheric pressure at the ocean surface was proposed, in which the pressure variation was represented by a spectral decomposition through a random process of orthogonal increments. From the basic equations of ideal and incompressible fluid a set of perturbation equations up to second order had been derived and solved. The pressure variation in the flow field had been calculated using the explicit solutions obtained, and which demonstrated a clear relation between the atmospheric pressure and the one at the bottom of deep ocean. It can be seen that there is a part of the pressure variation which is not attenuating with the depth. The result had been compared with those of Longuet-Higgins and Kadota et al. and all previous results are contained in the solution given in this artice. The restriction on the previous works with regard to the probability law has been removed, and all conclusions are deduced without specific assumptions. The flexibility of the proposed model allows for further generalization and extension in the physical aspects and statistical treatment.

关键词： random waves water waves nonlinear interaction orthogonal increments spectral decomposition microseism

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