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木鳖果的真空冷冻干燥工艺研究

广东农业科学 2013年第22期40卷 115-118页

作者： nguyen dinh duc 张意锋李保国上海理工大学食品科学与工程研究所上海200093

木鳖果是越南的一种常见高营养水果,近年来越南木鳖果产业发展很快,但是其干燥研究较少。采用真空冷冻干燥的方法确定木鳖果的最佳工艺参数,并分析比较干燥处理对木鳖果营养成分的影响。结果表明:木鳖果的共晶点为-16.71℃,共融点为-5.1... 详细信息

木鳖果是越南的一种常见高营养水果,近年来越南木鳖果产业发展很快,但是其干燥研究较少。采用真空冷冻干燥的方法确定木鳖果的最佳工艺参数,并分析比较干燥处理对木鳖果营养成分的影响。结果表明:木鳖果的共晶点为-16.71℃,共融点为-5.11℃。在冻结温度-45℃、时间2 h、真空度维持在2 000 Pa;一次干燥温度-13℃、时间1 h、真空度维持在500 Pa;二次干燥温度30℃、时间2 h、真空度维持在400 Pa左右的条件下工艺最佳。

关键词：木鳖果真空冷冻干燥共晶点共融点

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《西游记》中的佛教思想研究

《西游记》中的佛教思想研究

作者：阮廷明德（nguyen dinh MINH duc）首都师范大学

学位级别：硕士

《西游记》是中国古代小说“四大名著”之一,因其雅俗共赏的性质,不仅在中国受到广大读者欢迎,在国外也有很大影响。至今《西游记》已经被翻译成多种语言文字。佛教传到中国后,在流传过程中对中国文化影响甚大,并与中国的儒道文化相融... 详细信息

《西游记》是中国古代小说“四大名著”之一,因其雅俗共赏的性质,不仅在中国受到广大读者欢迎,在国外也有很大影响。至今《西游记》已经被翻译成多种语言文字。佛教传到中国后,在流传过程中对中国文化影响甚大,并与中国的儒道文化相融合,成为中国传统文化的有机成分。在文学方面,佛教的影响也很深。本文拟就明代小说《西游记》中的佛教影响,做较为深入的探讨。“西游”故事是因玄奘远赴印度求取佛经的历史事件而起,但在其流传过程中,却经历了一个渐渐远离历史事实的趋势,在发展中也采纳了不少不同时代其他文化、其他宗教的思想,并加上小说家自己的理解和见识。因此可以说,“西游”故事的发展过程始终与佛教保持着一种若即若离的关系。尽管如此,佛教对小说的影响仍是不可忽视的主流。《西游记》自问世起,即受到学者们的关注,出现了大量的评点及研究文字。其中有关《西游记》与佛教关系的论文,也有数十篇之多。但因为笔者自己是一名僧人,修行十多年,对佛教教义的了解与把握,可能比世俗研究者更为深入,角度亦有所不同。因此想就此旧题目,谈出一点个人的新见解,或许能给《西游记》的研究增添一点新的信息。本论文对《西游记》与佛教思想研究包括如下几个主要方面: 第一、《西游记》与般若教义的关系。即对佛教般若教义进行阐释,并讨论小说中所含的般若思想。第二、《西游记》与法相唯识宗的关系。即对佛教唯识宗做出介绍,并尝试从这个角度解读唐僧师徒四人的形象。第三、《西游记》与修行“戒定慧”的关系。即阐释“戒定慧”在佛教修行中的意义,并尝试从这个角度分析取经团中的人物关系。第四、《西游记》与《法华经》的关系。即从小说中的观音菩萨形象入手,阐释法华宗的内蕴;同时涉及佛教教义中的“平等性”问题。

关键词：《西游记》佛学般若唯识宗戒定慧观音菩萨

Studies on the Combination of Some Selected Microorganisms for Biodegradation of Cassava Peel Wastes （Manihot Esculenta）

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Journal of Environmental Science and Engineering(B) 2016年第7期5卷 342-347页

作者： Thanh Tran Vo Duy Minh Do Vu Thanh Son Le Thi Anh Hong Hong N-hung Do nguyen dinh duc nguyen Thi Bach Huyen nguyen Thi Van Ha NTT Hi-Tech Institute Nguyen Tat Thanh University HCM City 700000 Vietnam Faculty of Environment Ho Chi Minh City University of Natural Resources and Environment HCM City 700000 Vietnam Institute of Tropical Biology Vietnam Academy of Science and Technology HCM City 700000 Vietnam

Cassava peel has a lot of nutrients which can be utilized as fertilizer in agriculture. However, high cellulose contents may cause difficulty for organic digestion and slow down the nutrient absorption for plants. This study aims to reach the microorganisms or their combination for biodegradating the cassava peel waste. The initial result shows that after 21 days the glucose concentration in all samples was the highest during experiment times. The reducing glucose produced in mg/mL by the selected bacteria was 9.32, higher than the selected fungie of 1.57 mg/mL. The percentage degradation of cassava peel weigh was the highest for fungi which was 52% of weigh, respectively. Meanwhile, bacteria only degradated about 31.6% after 4 weeks. However, the combination between bacteria and fungi provides the highest glucose concentration, 19.29 mg/mL and digests 62% of the mass cassava in experiment. This study suggests that biodegradation of agro-wastes in the environment to reduce biomass waste pollution is very promising.

关键词： Biodegradation bacteria cassava peel wastes fungi.

Landslide Susceptibility Mapping Using RBFN-Based Ensemble Machine Learning Models

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 467-500页

作者： Landslide Susceptibility Mapping Using RBFN-Based Ensemble Machine Learning Models duc-Dam nguyen nguyen Viet Tiep Quynh-Anh Thi Bui Hiep Van Le Indra Prakash Romulus Costache Manish Pandey Binh Thai Pham Faculty of Civil Engineering University of Transport TechnologyThanh XuanHa Noi100000Vietnam Faculty of Hydraulic Engineering Hanoi University of Civil EngineeringHa Noi100000Vietnam DDG(R)Geological Survey of India Gandhinagar382010India Research Institute of the University of Bucharest Bucharest050663Romania National Institute of Hydrology and Water Management Bucharest013686Romania Department of Civil Engineering Transilvania University of BrasovBrasov500152Romania Danube Delta National Institute for Research and Development Tulcea820112Romania Marwadi University Research Center(MURC) Marwadi UniversityRajkotGujaratBharat360003India Department of Civil Engineering Faculty of Engineering&TechnologyMarwadi UniversityRajkotGujaratBharat360003India

This study was aimed to prepare landslide susceptibility maps for the Pithoragarh district in Uttarakhand,India,using advanced ensemble models that combined Radial Basis Function Networks(RBFN)with three ensemble learning techniques:DAGGING(DG),MULTIBOOST(MB),and ADABOOST(AB).This combination resulted in three distinct ensemble models:DG-RBFN,MB-RBFN,and ***,a traditional weighted method,Information Value(IV),and a benchmark machine learning(ML)model,Multilayer Perceptron Neural Network(MLP),were employed for comparison and *** models were developed using ten landslide conditioning factors,which included slope,aspect,elevation,curvature,land cover,geomorphology,overburden depth,lithology,distance to rivers and distance to *** factors were instrumental in predicting the output variable,which was the probability of landslide *** analysis of the models’performance indicated that the DG-RBFN model,with an Area Under ROC Curve(AUC)of 0.931,outperformed the other *** AB-RBFN model achieved an AUC of 0.929,the MB-RBFN model had an AUC of 0.913,and the MLP model recorded an AUC of *** results suggest that the advanced ensemble ML model DG-RBFN was more accurate than traditional statistical model,single MLP model,and other ensemble models in preparing trustworthy landslide susceptibility maps,thereby enhancing land use planning and decision-making.

关键词： Landslide susceptibility map spatial analysis ensemble modelling information values(IV)

Regularization of the Inverse Problem for Time Fractional Pseudo-parabolic Equation with Non-local in Time Conditions

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Acta Mathematica Sinica,English Series 2022年第12期38卷 2199-2219页

作者： nguyen duc PHUONG Le dinh LONG Anh Tuan nguyen Dumitru BALEANU Faculty of Fundamental Science Industrial University of Ho Chi Minh CityVietnam Division of Applied Mathematics Science and Technology Advanced InstituteVanLang UniversityHoChi Minh CityVietnam Faculty of Technology Van Lang UniversityHo Chi Minh CityVietnam Department of Mathematics Cankaya UniversityAnkaraTurkey Lebanese AmericanUniversity BeirutLebanon Institute of Space Sciences Magurele-BucharestRomania

This paper is devoted to identifying an unknown source for a time-fractional diffusion equation in a general bounded ***,we prove the problem is non-well posed and the stability of the source ***,by using the Modified Fractional Landweber method,we present regularization solutions and show the convergence rate between regularization solutions and sought solution are given under a priori and a posteriori choice rules of the regularization parameter,***,we present an illustrative numerical example to test the results of our theory.

关键词： Source problem fractional pseudo-parabolic problem ill-posed problem convergence estimates regularization

Formability improvement and blank shape definition for deep drawing of cylindrical cup with complex curve profile from SPCC sheets using FEM

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Journal of Central South University 2014年第1期21卷 27-34页

作者： duc-Toan nguyen Duy-Khoe dinh Hong-Minh Thi nguyen Tien-Long Banh Young-Suk Kim School of Mechanical Engineering Hanoi University of Science and Technology1A-Dai Co Viet StreetHai Ba Trung DistrictHanoi CityVietnam Department of Mechanical Engineering Hungyen University of Technology and EducationHungyenVietnam Department of Mechanical Engineering Kyungpook National University1370 SangyeokBuk-kuDaegu 702-701Korea

In the current work, to predict and improve the formability of deep drawing process for steel plate cold rolled commercial grade （SPCC） sheets, three parameters including the blanking force, the die and punch comer radius were considered. The experimental plan according to Taguchi＇s orthogonal array was coupled with the finite element method （FEM） simulations. Firstly, the data from the test of stress-strain and forming limit curves were used as input into ABAQUS/Explicit finite element code to predict the failure occurrence of deep drawing process. The three parameters were then validated to establish their effects on the press formability. The optimum case found via simulation was finally confirmed through an experiment. In order to obtain the complex curve profile of cup shape after deep drawing, the anisotropic behavior of earring phenomenon was modeled and implemented into FEM. After such phenomenon was correctly predicted, an error metric compared with design curve was then measured.

关键词： finite element method SPCC deep-drawing forming limit diagram criterion Taguchi's method earring prediction

Predicted aerodynamic damping of slender single beam structures in across-wind vibrations

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Acta Mechanica Sinica 2020年第5期36卷 990-998,I0001页

作者： Cung Huy nguyen dinh Tung nguyen Department of Civil Engineering Industrial University of Ho Chi Minh CityHo Chi Minh City 700000Vietnam Department of Civil Engineering University of NottinghamNottingham NG72RDUK

The paper presents a generalization of the conventional analytical approach where the quasisteady theory is utilised to evalu-ate the across-wind aerodynamic damping of slender single beam *** generalized theory considers the variation of structural and aerodynamic parameters along the structural height,together with the nature of the vertical wind profile and mode ***-form solutions for typical uniform and tapered tall buildings are given.A numerical application on a prototype tall building shows that the conventional method may be oversimplified,which results in incorrect predictions of the aerodynamic damping.

关键词： Aerodynamic damping Across-wind Slender structure-Galloping Tall building

Genetic diversity in two threatened species in Vietnam:Taxus chinensis and Taxus wallichiana

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Journal of Forestry Research 2017年第2期28卷 265-272页

作者： dinh Duy Vu Thi Tuyet Xuan Bui Minh Tam nguyen dinh Giap Vu Minh duc nguyen Van Thang Bui Xiaohua Huang Yi Zhang College of Forestry Northwest A&F UniversityYangling 712100ShaanxiPeople's Republic of China Vietnam National Museum of Nature Vietnam Academy of Science and Technology(VAST)18 Hoang Quoc VietCau GiayHanoiVietnam Institute of Ecology and Biological Resource(VAST) 18 Hoang Quoc VietCau GiayHanoiVietnam Institute of Natural Products Chemistry(VAST) 18 Hoang Quoc VietCau GiayHanoiVietnam Institute of Forest Biotechnology Vietnam Forestry UniversityXuan MaiChuong MyHanoiVietnam

Taxus chinensis and T. wallichiana in have been threatened in their distribution areas in recent decades because of their over-exploitation and reduction and destruction of native habitats. Determining the genetic diversity in populations of the two species will provide guidelines for their protection and preservation. Two hundred and fifteen trees from six populations of T. chinensis and150 sampled trees of T. wallichiana were sampled. Six microsatellite primer pairs selected from 16 primer pairs were used to investigate genetic variation at the population and species levels. Five yielded polymorphic alleles, and among the 13 putative alleles amplified, 11 were polymorphic（accounting for 76.33 %）.Shannon＇s information index（I） and percentage of polymorphic bands（PPB）（I = 0.202 and PPB = 67.22 % for T. chinensis; I = 0.217 and PPB = 65.03 % for T. wallichiana）. Both species had low levels of genetic diversity（mean Ho= 0.107, He= 0.121 for T. chinensis; Ho= 0.095, He= 0.109 for T. wallichiana）. Genetic differentiation among populations was higher（FST= 0.189） for T. chinensis and lower（0.156） for ***, indicating limited gene flow（Nm） among populations for T. chinensis（0.68） and T. wallichiana（0.65）.Variation among individuals of T. chinensis was 63.59 and73.12 % for T. wallichiana. Thus, the threatened status of the two conifers is related to a lack of genetic diversity. All populations are isolated in small forest remnants. An ex situ conservation site should be established with a new population for these species that comprises all the genetic groups for the best chance to improve their fitness under environmental stresses.

关键词： Taxus populations alleles polymorphic microsatellite Vietnam primer accounting putative destruction

Structural and luminescent properties of (Eu,Tb) PO_4·H_2O nanorods/nanowires prepared by microwave technique

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Journal of Rare Earths 2011年第12期29卷 1170-1173页

作者： nguyen Thanh Huong nguyen duc Van dinh Manh Tien Do Khanh Tung nguyen Thanh Binh Tran Kim Anh Le Quoc Minh Institute of Materials Science Vietnam Academy of Science and Technology University of Engineering and Technology National University HanoiVietnam

Nanowires/nanorods of europium/terbium orthophosphate monohydrate with Eu^3＋ concentration of 6, 11, and 20 at.% were prepared by microwave synthesis method. The effects of Eu^3＋ doping concentration on structure, morphology and optical properties of nanomaterials were also investigated. The results showed that, for all studied Eu^3＋ doping concentrations, a single-crystalline phase of rhabdophane-type （Eu,Tb）PO4·H2O nanowires/nanorods was obtained by using microwave heating of an aqueous solution of terbium（Ⅲ） nitrate, europium（Ⅲ） nitrate and NH4H2PO4 with pH=2. The length and width of these nanowires/nanorods ranged from 150 to 300 nm and from 10 to 50 nm, respectively. The evidence of energy transfer from Tb^3＋ to Eu^3＋ due to the energy overlap between the donor Tb^3＋ and the acceptor Eu^3＋was observed obviously via a significant enhancement in the luminescent intensity of Eu^3＋. Keywords：

关键词： microwave technique nanowires/nanorods energy transfer fluorescence spectroscopy rare earths