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Safe Vegetable Consumption in Hue City:A Case Study of Food Safety Situation in Vietnam

Journal of Agricultural Science and Technology(A) 2017年第B10期7卷 119-130页

作者： Nguyen Vinh Truong tran thi Bach Thao tran thi anh tuyet Nguyen Van Khanh tran Quang Khanh Van University of Agriculture and Forestry Hue UniversityHue 530000Vietnam Institute of Biotechnology Hue UniversityPhu ThuongPhu VangThua Thien Hue 530000Vietnam

Food safety has become a growing concern for citizens in the modern society when consuming unsafe food that directly impacts public health,life quality and well-being of each *** of Vietnam in general and specially in Hue city have been facing challenge of vegetable unsafety.A survey concerning the consumption of safe vegetables was conducted in Hue city,*** were collected by using a well-structured questionnaire from representative of 30 consumers,30 producers and 10 *** results showed that lettuce,sweet potato and Chinese mustard were identified as the most important vegetables to consumers in Hue *** of the consumers purchased vegetable every *** cost of vegetable in every transaction was about 30,000 *** expenditure has not created a great motivation for developing safe vegetable *** of the consumers in Hue city showed high interest,demand,trust and satisfaction for safe ***,50%of the consumers reported that the price of the safe vegetable was quite expensive and price was not matched with their ***,there were some disadvantages in each stage of vegetable supply *** example,land,seed,capital,cultivation techniques,preliminary processing,preservation,brand name,trademark and place to consume have not met the requirement of high technology production for the supply chain of safe *** chain linking between the production and consumption of vegetables is not *** and consumers do not have closely *** can not be traced to origin and there is no safe *** consumers believe the quality of vegetables depending on the prestige suppliers,such as,the vegetable shops with foreign *** vegetables of farmers are very difficult to be certified for safe *** and suggestions to Hue city are proposed that it is necessary to establish the vegetable production area in Hue *** growers should be supported w

关键词： Food safety vegetable consumption vegetable supplying chain Hue city

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Weka环境下模糊聚类算法集成研究

Weka环境下模糊聚类算法集成研究

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作者：陈氏映雪（tran thi anh tuyet）上海大学

学位级别：硕士

聚类分析是一种重要的数据挖掘工具，在传统意义上，聚类是准确地将数据样本分到不同的类当中，这就是所谓的硬划分。但生活中的多种事物属性都存在着一定的模糊性，也就是说事物之间没有明确的判断依据,无法准确地进行事物的划分与判断... 详细信息

聚类分析是一种重要的数据挖掘工具，在传统意义上，聚类是准确地将数据样本分到不同的类当中，这就是所谓的硬划分。但生活中的多种事物属性都存在着一定的模糊性，也就是说事物之间没有明确的判断依据,无法准确地进行事物的划分与判断,因此模糊聚类就发挥了自己的作用。模糊聚类分析是数据挖掘领域中的一个重要分支，在工程、计算机科学、生命和医学科学、社会科学和经济学等领域得到了广泛的应用。由于模糊聚类中的样本同时属于不同的类别，而且在各个类别的隶属度不同，这种不确定性反映了样本类属的模糊性，更能客观地反映现实世界，因此研究模糊聚类的算法及其应用具有十分重要的价值。 Weka是新西兰Waikato大学开发的数据挖掘平台，它为数据挖掘领域研究者提供了多种分类、聚类和关联规则等数据挖掘方法，数据预处理功能，以及算法性能评估的多种方法。作为一个开源平台，Weka具有非常良好的扩展性和兼容性，有良好定义的数据结构和基本的统计接口，为开发者提供了一个非常便利的工具。本文主要从模糊聚类的现有问题中寻找有效措施，提高聚类结果的准确性，算法的稳定性和健壮性，减少人工的干预和对不同领域专业知识的依赖。因此，本文将基于和声搜索和谱分析的模糊聚类算法在Weka平台上实现了封装和应用，丰富该平台的聚类算法组合，扩大其使用范围。本文的工作和创新如下：首先，提出了全局动态自适应和声搜索自动模糊聚类（Global DynamicAdaptive Clustering Harmony Search K-Harmonic Means， GDACHSKHM）算法，它是基于和声搜索与KHM混合的元启发模糊聚类算法。GDACHSKHM利用了和声搜索的全局搜索能力，能够分析数据本身的特点来确定簇的数目而不需要任何先验知识，同时能自适应地找到问题的全局近似最优解。算法运行过程中，参数能够根据每次迭代的结果来更新其值而无需手动调整，减少了人工干预。经过实验证明GDACHSKHM具有良好的聚类效果和健壮性。其次，提出了谱差分进化调和K均值模糊聚类（Spectral DifferentialEvolution KHM，SPDEKHM）算法。该算法分为两步：谱映射和模糊聚类。谱映射实际上是Laplacian矩阵的特征求解过程，它将数据从原来空间映射到低维的解空间，减少了数据维数，让数据集的划分更加明显;映射过程中通过分析Laplacian矩阵的特征值梯度来自动确定簇个数。再利用DEKHM算法将映射空间的节点进行聚类，发挥DE和KHM各自的优点已达到最好的聚类结果。实验证实该算法在大多数的情况下能获得准确率较高的聚类结果。最后，将谱聚类的思想应用到复杂网络的社团结构检测问题中，提出了基于关联矩阵谱映射的自动社团检测（Correlation Spectral MappingAutomatic Community Detection, CSMACD）算法。该算法首先通过关联矩阵的谱映射将社团检测问题转换为聚类问题，再以模块度值为目标函数，通过DEKHM算法来寻找最优的社团数目和相应的网络划分方案。在模拟网络和真实网络上的实验表明CSMACD能够准确地分析结构复杂，社团大小不同的网络社团结构，具有良好的健壮性。

关键词：模糊聚类 Weka 和声搜索谱聚类社团检测

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Clustering Gene Expression Data Based on Harmony Search and K-harmonic Means

Clustering Gene Expression Data Based on Harmony Search and ...

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第11届分布式计算及其应用国际学术研讨会

作者： Anping Song Jianjiao Chen tran thi anh tuyet Xuebin Bai Jiang Xie Wu Zhang School of Computer Engineering and Science Shanghai University School of Information Science and Engineering Xinjiang University

Clustering is one of the most commonly data explorer techniques in Data Mining. K-harmonic means clustering（KHM） is an extension of K-means（KM） and solves the problem of KM initialization using a built-in boosting function. However, it is also suffering from running into local optima. As a stochastic global optimization technique, harmony search（HS） can solve this problem. HS-based KHM, HSKHM not only helps KHM clustering escaping from local optima but also overcomes the shortcoming of slow convergence speed of HS. In this paper, we proposed a hybrid data-clustering algorithm, HSKHM. The experimental results on four real gene expression datasets indicate that HSKHM is superior KHM and HS in most cases. The HSKHM algorithm not only improves the convergence speed of HS but also helps KHM escaping from local optima.

关键词： KHM HS Clustering Gene expression data Introduction

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彿教六和敬思想及其现代伦理价值研究

彿教六和敬思想及其现代伦理价值研究

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作者：陈氏雪英（tran thi tuyet anh）华中师范大学

学位级别：硕士

在中国传统思想中,和谐是传统思想中的核心思想之一,外来的佛教文化传入中国之后,以融合与继承的方式来融入中国文化精华思想,其中和谐思想也被佛教文化所接纳。六和敬理论思想是佛教的基本教义之一,是建构佛教僧团大厦的根基。六和敬... 详细信息

在中国传统思想中,和谐是传统思想中的核心思想之一,外来的佛教文化传入中国之后,以融合与继承的方式来融入中国文化精华思想,其中和谐思想也被佛教文化所接纳。六和敬理论思想是佛教的基本教义之一,是建构佛教僧团大厦的根基。六和敬思想体现了佛教建僧护法的目的,使僧团组织管理发挥内部的团结力量,使僧人们修身养心、弘法利生、铸造圣贤、主持佛教的团体力量,维持佛教久住世间,六和敬思想也是保持僧团清净和乐的法宝。佛教认为在我们这个世间,万物现象都不是独立存在的,而需要与其他因缘和合才能生存与发展,每个人的身、口、意的善恶行为都会对自己的命运产生影响,也会对他人和我们的生活环境产生影响,所以它要求人们从道德规范上严格克制自己,特别是从内心里控制好自己的欲望、无明、贪、嗔、痴,预防自身造作不善的行为,消除许多不符合道德准则的行为,起到维护社会和谐稳定发展的积极作用。然而,佛教的六和敬思想至今没有得到社会人士与伦理研究者的重视,只是把它看成佛教僧团内部的一种管理体系而已。在经济全球化迅速发达的今天,拜金主义越来越得到人们重视,尽管社会财富日益增长,但人们却不能否认当代社会出现了许多危机,产生了不和谐现象,这与制度、政策不完善密切相关,人们的心灵失衡甚至扭曲,道德思想日益变质甚至变异,人们过于自私和追求享乐主义思想,而忽视了内在的精神素养。社会人们只依靠宗教的信仰情感,而毫无真正宗教的道德思想,没有被宗教道德思想所约束,很容易遇到一些冲突问题,引致各种社会关系与团体关系日益恶化。佛教的六和敬思想恰恰给予社会人们的对治良药,能够治好人们心中的道德思想问题,使人们对自己的人生抱有希望,以致可以过一种完美的生活并能建设完美的世界。佛教的六和敬思想对人们的止恶扬善和确立道德信仰起到了积极作用,社会人们可以从其中汲取有价值的伦理资源,对建设新时期的道德信仰的事业具有极为重要的借鉴意义和启示作用。本文把论文内容分为五个部分进行研究探讨。第一章对佛教的六和敬思想的基础内容和重要特征进行了综述。佛陀建立佛教之前,印度已经存在了很严重的社会阶层分割。释加牟尼成佛之后,才形成了通过一种教理来对治现实社会的局面。佛教六和敬理论和其他教理体系中的理论是不可分割的,它们之间具有内在伦理的密切关系。因此,本章注重考察分析一下“六和敬”三个词的词源与用法以及它在印度和中国的形成过程。通过它与印度和中国的历史性、文化性、民族性等方面的不可分割的联系,我们才能够认识到佛教的六和敬的伦理思想,并领会到佛教六和敬思想的特色。第二章主要介绍了六和敬的理论基础和主要内容,阐述了六和敬思想提出的原因和过程,从印度佛教历史上的社会现状和僧团组织的现实问题中找出了佛陀提出了六和敬的原因与发展过程。第三章主要介绍了佛教与其他传统文化的和敬思想的比较,分析阐述了佛教的和敬与基督教的和敬思想,以此提出了它们之间的异同之处,找出了佛教的六和敬思想的主要特征。第四章探讨了佛教六和敬的伦理价值,注重分析了佛教六和敬思想的止恶扬善伦理价值与佛教六和敬思想和谐现代社会伦理价值以及佛教六和敬思想体现的慈悲博爱的精神价值。第五章探讨阐述了佛教六和敬思想的现代启示意义,也包括对人的自身修养的启示和对社会伦理的启示以及促进人类可持续性发展的启示,通过它们唤醒我们社会人们的高度责任感与责任心,同时强调了人们应对自己的所作所为负责。

关键词：六和敬思想止恶扬善和谐精神平等看待责任负责

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BTEX pollution caused by motorcycles in the megacity of HoChiMinh

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Journal of Environmental Sciences 2013年第2期25卷 348-356页

作者： tran thi Ngoc Lan Pham anh Minh University of Science Vietnam National University227 Nguyen Van CuHoChiMinh 70000Vietnam

Monitoring of benzene, toluene and xylenes （BTEX） was conducted along with traffic counts at 17 roadside sites in urban areas of HoChiMinh. Toluene was the most abundant substance, followed by p,m-xylenes, benzene, o-xylene and ethylbenzene. The maximum observed hour-average benzene concentration was 254 μg/m3 . Motorcycles contributed to 91% of the traffic fleet. High correlations among BTEX species, between BTEX concentrations and the volume of on-road motorcycles, and between inter-species ratios in air and in gasoline indicate the motorcycle-exhaust origin of BTEX species. Daily concentrations of benzene, toluene, ethylbenzene, p,m-xylenes and o-xylene were 56, 121, 21, 64 and 23 μg/m 3 , respectively. p,m-xylenes possess the highest ozone formation potential among the BTEX family.

关键词： air pollution benzene BTEX HoChiMinh motorcycle exhaust

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transient response of doubly-curved bio-inspired composite shells resting on viscoelastic foundation subject to blast load using improved first-order shear theory and isogeometric approach

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Defence Technology（防务技术） 2024年第8期38卷 171-193页

作者： Thuy tran thi Thu Tu Nguyen anh Hue Nguyen thi Hong Nguyen thi School of Mechanical and Automotive Engineering Hanoi University of IndustryHanoiViet Nam Faculty of Technical Fundamental University of Transport TechnologyHanoiViet Nam Faculty of Mechanical Engineering Thuyloi University175 Tay SonDong DaHanoiViet Nam

Investigating natural-inspired applications is a perennially appealing subject for scientists. The current increase in the speed of natural-origin structure growth may be linked to their superior mechanical properties and environmental resilience. Biological composite structures with helicoidal schemes and designs have remarkable capacities to absorb impact energy and withstand damage. However, there is a dearth of extensive study on the influence of fiber redirection and reorientation inside the matrix of a helicoid structure on its mechanical performance and reactivity. The present study aimed to explore the static and transient responses of a bio-inspired helicoid laminated composite(B-iHLC) shell under the influence of an explosive load using an isomorphic method. The structural integrity of the shell is maintained by a viscoelastic basis known as the Pasternak foundation, which encompasses two coefficients of stiffness and one coefficient of damping. The equilibrium equations governing shell dynamics are obtained by using Hamilton's principle and including the modified first-order shear theory,therefore obviating the need to employ a shear correction factor. The paper's model and approach are validated by doing numerical comparisons with respected publications. The findings of this study may be used in the construction of military and civilian infrastructure in situations when the structure is subjected to severe stresses that might potentially result in catastrophic collapse. The findings of this paper serve as the foundation for several other issues, including geometric optimization and the dynamic response of similar mechanical structures.

关键词： Blast load Modified first-order shear theory Biological composite structures

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Contributions of Rotation,Expansion and Line Broadening to the Morphology and Kinematics of the Inner CSE of Oxygen-rich AGB Star R Hya

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Research in Astronomy and Astrophysics 2023年第1期23卷 40-47页

作者： Pham tuyet Nhung Do thi Hoai Pierre Darriulat Pham Ngoc Diep Nguyen Bich Ngoc tran thi Thai Pham Tuan-anh Department of Astrophysics Vietnam National Space CenterVietnam Academy of Science and Technology18Hoang Quoc VietNghia DoCau GiayHa NoiVietnam

We use archival ALMA observations of the CO(2-1)and SiO(5-4)molecular line emissions of AGB star R Hya to illustrate the relative contributions of rotation,expansion and line broadening to the morphology and kinematics of the circumstellar envelope(CSE)within some~70 au(~0."5)from the centre of the *** give evidence for rotation and important line broadening to dominate the inner region,within~14 au(~100 mas)from the centre of the *** former is about an axis that projects a few degrees west of north and has a projected rotation velocity of a few km s^(-1).The latter occurs within some 7-14 au(50-100 mas)from the centre of the star,with the line width reaching two to three times its value outside this *** suggest that it is caused by shocks induced by stellar pulsations and convective cell *** show the importance of properly accounting for the observed line broadening when discussing rotation and evaluating the radial dependence of the rotation velocity.

关键词： stars AGB and post-AGB-(stars:)circumstellar matter-radio lines

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Fabrication and properties of high efficiency luminescent nanorods EuPO_4·H_2O by soft template method

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Journal of Rare Earths 2011年第12期29卷 1174-1177页

作者： tran Thu Huong tran Kim anh Le thi Vinh W.Strek Hoang thi Khuyen Le Quoc Minh Institute of Materials Science Vietnam Academy of Science and Technology Department of Chemistry Hanoi University of Mining and Geology Institute of Low Temperature and Structure Research University of Engineering and Technology National University Hanoi

Europium orthophosphate monohydrate （EuPO4·H2O） nanorods with typical dimensions of about 10-30 nm in diameter and 300-500 nm in length were prepared by using the soft template method. The effects of using diethylene glycol （DEG） and polyethylene glycol （PEG） polymers as well as the pH values on the size, crystalline structure and morphology of EuPO4·H2O nanorods were investigated. Field emission scanning electron microscopy （FESEM） and X-ray diffraction （XRD） data of the prepared samples were elucidated. The nanorods were highly uniform and their mean length was reduced by using DEG and PEG as soft template agents. For all prepared samples, the rhabdophanetype hexagonal EuPO4·H2O was the dominated phase. The photoluminescence （PL） spectroscopy measurements of EuPO4·H2O nanorods revealed that, under UV excitation, EuPO4·H2O nanorods exhibited strong luminescence with narrow bands corresponding to the intra-4f transitions of ^5D0→^7Fj （j=1, 2, 3, 4） of Eu^3＋ ions. The peaks were found at 594 nm （^5D0→^7F1）, 619 nm （^5D0→^7F2）, 652 nm （^5D0→^7F3）, and 697 nm （^5D0→^7F4）, with the strongest emission at 594 nm.

关键词： soft template method EuPO4·H2O nanorods fluorescence rare earths

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Luminescent and magnetic properties of multifunctional europium(Ⅲ) complex based nanocomposite

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Journal of Rare Earths 2019年第11期37卷 1237-1241页

作者： Hoang thi Khuyen Nguyen Thanh Huong tran Thu Huong Pham thi Lien Do thi anh Thu Nguyen thi anh Huong Wieslaw Strek Le Quoc Minh Institute of Materials Science Vietnam Academy of Science and Technology18 Hoang Quoc VietCau CiayHanoiViet Nam Graduate University of Science and Technology Vietnam Academy of Science and Technology18 Hoang Quoc VietCau GiayHanoiViet Nam Department of Chemistry University of Natural SciencesHanoi National University19 Le Thanh TongHoan KiemHanoiViet Nam Institute of Low Temperature and Structure Research PASOkolna 2Wroclaw 50-422Poland Duy Tan University K7/25 Quang TrungDa DangViet Nam

The luminescent rare earth(RE)complex based multifunctional nanocomposites offer new potential applications of multimodal imaging(magnetic resonance imaging(MRI),fluorescent bioimaging,etc.)that can be associated with therapeutic *** this study,we report some results obtained with novel multifunctional Fe3O4/Si-amine/Eu(NTA)3 nanocomposites that are composed of europium(Ⅲ)complex with 1-(2-naphthoyl)-3,3,3-trifluoroacetone ligands(NTA)(Eu(NTA)3)and superparamagnetic Fe3O4 *** nanocomposites were functionalized with an amine group for biomedicine *** multifunctional Fe3O4/Si-amine/Eu(NTA)3 nanocomposites exhibit both good magnetic behavior of Fe3O4 nanoparticles as a core and strong fluorescent property of europium(Ⅲ)*** characterizations were analyzed by XRD,SEM,EDX and FTIR *** optical properties were studied in detail by UV-VIS spectra and luminescent emission *** magnetic property was estimated by *** effect of concentrations of luminescent Eu(NTA)3 complex on luminescent and magnetic properties is discussed.

关键词： Multifunctional nanocomposite Luminescence Magnetic Europium(Ⅲ)complex Fe3O4 Rare earths

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Assessment of different machine learning techniques in predicting the compressive strength of self-compacting concrete

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Frontiers of Structural and Civil Engineering 2022年第7期16卷 928-945页

作者： Van Quan tran Hai-Van thi MAI Thuy-anh NGUYEN Hai-Bang LY Faculty of Civil Engineering University of Transport TechnologyHanoi 100000Vietnam

The compressive strength of self-compacting concrete(SCC)needs to be determined during the construction design *** paper shows that the compressive strength of SCC(CS of SCC)can be successfully predicted from mix design and curing age by a machine learning(ML)technique named the Extreme Gradient Boosting(XGB)algorithm,including non-hybrid and hybrid *** ML techniques,such as Linear regression(LR),K-Nearest Neighbors(KNN),Support Vector Machine(SVM),Decision Trees(DTR),Random Forest(RF),Gradient Boosting(GB),and Artificial Neural Network using two training algorithms LBFGS and SGD(denoted as ANN_LBFGS and ANN_SGD),are also compared with the XGB ***,the hybrid models of eight ML techniques and Particle Swarm Optimization(PSO)are constructed to highlight the reliability and accuracy of SCC compressive strength prediction by the XGB_PSO hybrid *** highest number of SCC samples available in the literature is collected for building the ML *** with previously published works’performance,the proposed XGB method,both hybrid and non-hybrid models,is the most reliable and robust of the examined techniques,and is more accurate than existing ML methods(R2=0.9644,RMSE=4.7801,and MAE=3.4832).Therefore,the XGB model can be used as a practical tool for engineers in predicting the CS of SCC.

关键词： compressive strength self-compacting concrete machine learning techniques particle swarm optimization extreme gradient boosting

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