检索结果-南通市图书馆

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

在线全文

学校读者我要写书评

暂无评论

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

Synthesis and characterization of core/shell structured nanophosphors CePO_4:Tb@LaPO_4 by solvothermal method

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2011年第12期29卷 1147-1151页

作者： Dinh Xuan Loc tran Thi Kim Chi tran thu huong Nguyen Vu tran Kim Anh Wieslaw Strek Le Quoc Minh Institute of Materials Science Vietnam Academy of Science and Technology Institute of Low Temperature and Structure Research Polish Academy of Sciences(PAN) University of Engineering and Technology

Core/shell structured CePO4：Tb（Ⅲ）@LaPO4 and CePOa：Tb（Ⅲ） were successfully synthesized in tris（2-ethylhexyl） phosphate （TEHP） and diethylene glycol （DEG） solvents for comparison of the two techniques in open air and closed reaction vessel. Morphology and crystal structure of the core/shell nanophosphors were determined by using X-ray diffraction （XRD） and transmission electron microscopy （TEM）, which showed that nanophosphors had diameter of about 5-10 nm with the monoclinic monazite phase. The nanophosphors obtained by close vessel procedure showed smaller size, more homogeneity and pure crystallite. The luminescent measurements were done upon the different excitation wavelengths in ultraviolet region and at room temperatm＇e to elucidate the influences of the used solvents and the reaction temperatures. It was found that CePO4：Tb@LaPO4 preparedby the close vessel synthesis showed the intensity of green band of the transfer from 5D4 to 7F5 energy level, which was strongly increased, and the luminescent decay time was 3.2 ms, which was longer than that of naked CePO4：Tb phosphor.

关键词： solvothermal synthesis luminescence CePOn:Tb CePOa:Tb@LaPO4 rare earths

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

在线全文

学校读者我要写书评

暂无评论

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

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

在线全文

学校读者我要写书评

暂无评论

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

Synthesis and characterization of NaYF4:Yb3+,Er3+@silica-N=folic acid nanocomplex for bioimaginable detecting MCF-7 breast cancer cells

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2019年第11期37卷 1183-1187页

作者： Ha Thi Phuong tran thu huong Le Thi Vinh Hoang Thi Khuyen Do Thi Thao Nguyen Thanh huong Pham Thi Lien Le Quoc Minh Institute of Materials Science Vietnam Academy of Science and Technology18 Hoang Quoc VietCau GiayHanoiViet Nam Graduate University of Science and Technology-Vietnam Academy of Science and Technology 18 Hoang Quoc VietCau GiayHanoiViet Nam Department of Chemistry Hanoi Medical University1-Ton That TungDong DaHanoiViet Nam Department of Chemistry Hanoi University of Mining and Geology18-Pho LienBac Tu LiemHanoiViet Nam Institute of Biotechnology Vietnam Academy of Science and Technology18-Hoang Quoc VietCau GiayHanoiViet Nam Duy Tan University K7/25 Quang TrungDa NangViet Nam

Upconversion nanophosphors are new promising nanomaterials to be used as biolabels for detection and imaging of cancer *** nanophosphors absorb long-wavelength excitation radiation in the infrared or near infrared region and emit shorter wavelength,higher energy radiation from ultraviolet to *** this paper,we studied the hydrothermal method and optical properties of the functionalized NaYF4:Yb^3+,Er^3+for biomedical *** synthesis,these NaYF4:Yb^3+,Er^3+nanophosphors were functionalized with aminosilanes and folic *** acid binds to the folate receptor on the surface of MCF-7 breast cancer cells and this binding promotes internalization of the nanophosphors via *** sizes of the functionalized NaYF4:Yb^3+,Er^3+@silica-N=FA(folic acid)nanophosphors can be controlled with length of the rod about 300-800 nm and diameter of the rod about 100-200 *** structure of NaYF4:Yb^3+,Er^3+is in hexagonal crystal *** photo luminescence(PL)spectra of the functionalized NaYF4:Yb^3+,Er^3+@silica-N=FA nanophosphors were *** nanophosphors emit in red color with the strongest band at 650 nm under 980 nm *** result can provide NaYF4:Er^3+,Yb^3+@silica-N=FA complex for developing fluorescence label and image tool in cancer biology and medicine.

关键词： Upconversion luminescence NaYF4:Yb^3+,Er^3+ Nanophosphors Bioimaging Cancer cell Rare earths

Nonlocal isogeometric analysis for bidirectional functionally graded porous curved microbeams with arbitrary boundary conditions

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2024年第8期40卷 194-218页

作者： thu-huong Nguyen Thi Van Ke tran Van-Minh Phung Van Hai Trinh Quoc Hoa Pham Faculty of Mechanical Engineering Hanoi University of IndustryHanoi100000Vietnam Faculty of Mechanical Engineering Le Quy Don Technical UniversityHanoi100000Vietnam Institute of Vehicle and Energy Engineering Le Quy Don Technical UniversityHanoi100000Vietnam Faculty of Engineering and Technology Nguyen Tat Thanh UniversityHo Chi Minh City700000Vietnam

This research aims to analyze the static bending and free vibration behaviors of bidirectional functionally graded porous(BFGP)curved microbeams with elastic boundary conditions resting on a Pasternak’s elastic foundation in a hygro-thermal *** analysis based on non-uniform rational B-splines,first-order shear deformation theory,nonlocal elasticity theory combined with the modified strain gradient theories,modified Timoshenko beam theory are formulated to depict bending and shear deformations of BFGP curved ***,because using the modified Timoshenko beam theory,this study removes the requirement for a shear correction factor and describes shear stress by zero at the upper and lower cross-sectional sites of the BFGP curved *** from traditional boundary conditions,where the beginning and end positions of a curved beam are connected by an elastic system of straight and torsion *** allows for greater flexibility in controlling the stiffness of the springs to obtain arbitrary *** assess the accuracy and convergence of the proposed approach,validation numerical examples were conducted in the various examples.

关键词： Bidirectional functionally graded porous material Elastic boundary condition Isogeometric analysis Curved microbeams Nonlocal elasticity theory Modified strain gradient theory

Ntic and Teenagers in the South： Case of High-School Students in Recife, Aignan, and Hanoi

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Psychology Research 2017年第12期7卷 627-638页

作者： Elaine Magalhaes Costa Femandez tran thu huong Trinh Thi Linh Federal University of Pernambuco (UFPE) Recife Brazil University of Social Sciences and Humanities (USSH) of Hanoi Hanoi Vietnam

From the work on the Eurocentric critical thinking and on the territorialisation of the Internet, three researchers will present the theoretical and epistemological bases of an international research on the intercultural aspects of the impact of the New Technologies of Information and Communication (NTIC) on the process of socialization and subjectivation of high-school students from three continents. It will be the issues of a methodological triangulation based on the ecology of knowledge and the intercultural perspective, in the respect for the cultural context of the participants, their pluralities and particular isms. Online questionnaire consisting of 50 questions was developed in Portuguese in Brazil and translated according to the method of trans-cultural adaptation in French and then in Vietnamese. It will be a question of a critical analysis of the construction and validation of the instrument, its cross-cultural adaptations, as well as the method of result analysis through the Program Statistical Package for the Social Sciences (SPSS), the objective of which is to describe the modalities of use of social networks, and video games of high-school students in Hanoi. thus it is hoped to compare the characteristics of the population studied (number, age, schooling, and sexes), the rhythm and modalities of use of video games and social networks, the relationships between different members of the family and their peers, to the data of the other two populations studied. The parallel between the data obtained in Vietnam, France, and Brazil will contribute to the understanding on the part of the context and the cultural affiliation in the establishment of relationships between the users and the NTIC and consequently to the definition of the methods of prevention of risks more adapted to the realities of young people and their families.

关键词：中学生大小写南方少年社会科学视频游戏跨文化研究人员

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

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

越南学生习得名量词“只、头、条”的偏误分析及教学对策

在线全文

学校读者我要写书评

暂无评论

越南学生习得名量词“只、头、条”的偏误分析及教学对策

作者：陈秋香（tran thu huong）辽宁师范大学

学位级别：硕士

在现代汉语中,量词占有一个非常重要的位置。虽然不可称为鳌头独占,但是也能够令人注目。量词基本上分为两类:名量词与动量词。其中,名量词的数量与使用频率最多,也容易让外国学习者产生各种各样的偏误。对学习汉语的外国学习者而言,量... 详细信息

在现代汉语中,量词占有一个非常重要的位置。虽然不可称为鳌头独占,但是也能够令人注目。量词基本上分为两类:名量词与动量词。其中,名量词的数量与使用频率最多,也容易让外国学习者产生各种各样的偏误。对学习汉语的外国学习者而言,量词一直都是一个难以掌握的问题。越南学生更不是一个例外。越南与中国有很多文化的相同之处,这也影响到越南学生学习汉语的过程,有负面性,也有积极性。论文采用文献分析法、数据统计法和对比分析法、调查分析法和访谈法开展研究,在梳理关于名量词的汉语本体知识,概括中国国内研究相关问题的情况,深入理解名量词“只、头、条”的特征与使用范围,指出三个名量词的异同并提供越南语相当的“类词”的基础上,拟定关于名量词“只、头、条”的调查问卷,对越南学生实施问卷调查,总结偏误类型,并具体地分析越南学生学习名量词“只、头、条”的过程中产生的各种偏误原因。最后提供了越南学生学习名量词的对策与汉语教师开展名量词教学的对策。论文不仅让学习者明确量词“只、头、条”的用法,还有助于翻译者,或具有当翻译者的职业规划的越南学生,尤其是笔译翻译者提高汉语水平。期待对针对越南学生的汉语教学提供有益参考。

关键词：名量词习得只头条越南学生