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EP Aquarii:A New Picture of the Circumstellar Envelope

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Research in Astronomy and Astrophysics 2024年第3期24卷 83-105页

作者： Pham T.Nhung Do T.Hoai Pierre Darriulat Pham Tuan-Anh Pham N.Diep nguyen B.Ngoc Tran T.Thai Department of Astrophysics Vietnam National Space CenterVietnam Academy of Science and Technology18Hoang Quoc VietNghia DoCau GiayHa Noivietnam

New analyses of earlier ALMA observations of oxygen-rich AGB star EP Aquarii are presented,which complete a previously published analysis and offer a different interpretation of the morpho-kinematics of the circumstellar *** birth of the equatorial density enhancement(EDE)is shown to occur very close to the star where evidence for rotation has been *** to the star and where outflows have been observed:their interaction with the gas of the nascent EDE is seen to play an important role in the development of the wind and the evolution of its radial velocity from 8 to 10 km s^(-1) on the polar symmetry axis to~2 km s^(-1) at the *** implies complex morpho-kinematics:making reliable interpretations with reasonable confidence is *** particular,it questions an earlier interpretation implying the presence of a white dwarf companion orbiting the star at an angular distance of -0″4 from its *** proposes instead an interpretation in terms of a standard mass ejection associated with a shock wave leaving a void of emission in its *** Doppler velocity wings are seen to consist of two components,the upper velocity end of the global wind,reaching above±12 km s^(-1),and an effective line broadening,confined within 200 mas from the center of the star,reaching above±20 km s^(-1) and interpreted as caused by the pattern of shock waves resulting from the interaction between stellar pulsation and convective cell partition.

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

Challenges in Power Production Investment in Vietnam

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Journal of Electrical Engineering 2019年第1期7卷 14-18页

作者： Nam Hoai nguyen Binh Van Doan Quyen Le Luu Thanh Cao nguyen Institute of Energy Science Vietnam Academy of Science and Technology18 Hoang Quoc VietCau GiayHanoi 10072Vietnam

This paper presents the results of the survey to initially assess the current situation of power supply chain development in Vietnam. The research team used questionnaires to identify challenges and barriers in power production investment. Surveyors came from power generation units, power transmission and distribution units, service providers for power plants, consulting agency and research institutes. The results indicated that there is a difference among enterprises’ barriers and difficulties in the management, finance and investment environment. This difference is related to the business profiles of the enterprise, its segment of the electricity generation market, capacity and experience in the market.

关键词： Power production investment Vietnam policy recommendation

Optical Trap 2D Array by Acoustic Modulation

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Journal of Physical Science and Application 2014年第7期4卷 420-425页

作者： Van Thinh nguyen Quang Quy Ho Physics Faculty Bac Lieu University Bac Lieu Vietnam Institute of Applied Physics NEWTECHPRO VAST 8 Hoang Quoc Viet Hanoi Vietnam

In this artilce a new optical trap 2D array by the acoustic modulation is proposed. Based on the ＂called＂ acoustic-elasticity of the fluid embedding trapped microparticle, the expression describing the refractive index induced by cross-interference of two perpendicular ultrasonic waves is approximately derived. By simulation, the 2D array of the Graded-refractive index lenses appeared in the fluid layer with certain strain-acoustic constant and thickness. The trapping capability of the plane-wave laser beam propagating through those lenses is shown out, and the appearance of the optical trap 2D array has been affirmed.

关键词： Optical trap array acoustic modulation microlens.

Recognition of earthquake-prone nodes,a case study for North Vietnam (M≥5.0)

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Geodesy and Geodynamics 2012年第2期3卷 14-26页

作者： nguyen Huu Tuyen Ngo Thi Lu Institute of Geophysics Vietnam Academy of Science and Technology A8/18.Hoang Quoc VietHanoiVietnam Earth's System Physics(ESP) International Centre for Theory Physics(ICTP)Strada Costiera 1134151 TriesteItaly

Morphostructural nodes in North Vietnam are delineated with the morphostructural zoning （MZ） method, and classified into seismogenic and non-seismogenic nodes. The compiled morphostructural map （ scale 1 ： 1000000） shows a three-level hierarchical structure of blocks, boundary zones, and nodes. The identified nodes are classified with the pattern-recognition algorithm CORA-3 into those that are prone to generate M≥5.0 earthquakes and those that are not. Some of the earthquake-prone nodes coincide with epicenters of M ≥ 5.0 earthquakes that have occurred ; others may coincide with such events in the future.

关键词： North Vietnam morphostructural zoning pattern recognition seismogenic nodes

SOME PRELIMINARY RESULTS FROM STUDY OF CRUSTAL DEFORMATION IN VIETNAM

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大地测量与地球动力学 2003年第B12期23卷 114-118页

作者： Cao Dinh Trieu Le Van Dung nguyen Huu Tuyen Pham Nam Hung Institute of Geophysics Institute of GeophysicsInstitute of GeophysicsInstitute of Geophysics 18 Hoang Quoc Viet Road Cau GiayHanoi18 Hoang Quoc Viet Road Cau GiayHanoi18 Hoang Quoc Viet Road Cau GiayHanoi18 Hoang Quoc Viet Road Cau GiayHanoi

In this work, the authors present some results of strain monitoring within the territory of Vietnam from 1984 to 2001. Data analysis shows that (1) the Phu Lien area is tectonically stable with low strain rate, 1×10\+\{-6\} /a; (2) the Hoa Binh area has indication of tectonic instability with relatively high strain rate of the earth crust: absolute value of the strain reaching 100×10\+\{-6\}, usual average strain amplitude of 60×10\+\{-6\}, whereas the monthly average strain intensity varies in a range from 30×10\+\{-6\} to 50×10\+\{-6\}; (3) there are clear indications of the strain state of the earth crust before occurrence of earthquakes of medium or higher magnitude. This is a very important indication in the research and short term prediction of earthquakes, especially for the areas with low seismic stability like the NW of Vietnam.

关键词：越南表层变形应变测量系统操作原则应变数据因变与地震相对关系地震活动特性

合柱秋海棠——越南北部喀斯特地区秋海棠科盾叶一新种

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植物研究 2022年第4期42卷 521-527页

作者：陈文红李景秀 nguyen Quang-Hieu nguyen Sinh-Khang PHAM Van-The 范长丽向建英税玉民中国科学院东亚植物多样性与生物地理学重点实验室中国科学院昆明植物研究所中国昆明650201 昆明植物园中国科学院昆明植物研究所中国昆明650201 植物保育中心越南科学技术联盟越南河内生态与生物资源研究所越南科学技术部越南河内环境管理研究室高级科技研究所孙德盛大学越南胡志明市技术系孙德盛大学技术系越南胡志明市云南生物多样性研究院西南林业大学中国昆明650224 云南省喀斯特地区生物多样性保护研究会中国昆明650201 滇东南热带山地生态系统定位研究站中国屏边661200

描述了采自越南北部喀斯特地区秋海棠科(Begoniaceae)盾叶一新种,即合柱秋海棠(Begonia holostyla)。该新种在盾形叶和具黑色斑点的果实特征上相似于肿柄秋海棠(***),但是在合生到一半的花柱和新月形的柱头方面则不同,后者花柱基部合生... 详细信息

描述了采自越南北部喀斯特地区秋海棠科(Begoniaceae)盾叶一新种,即合柱秋海棠(Begonia holostyla)。该新种在盾形叶和具黑色斑点的果实特征上相似于肿柄秋海棠(***),但是在合生到一半的花柱和新月形的柱头方面则不同,后者花柱基部合生,柱头2次分裂成1个螺旋状的带。此外,讨论了与近缘种肿柄秋海棠的形态差异和地理联系。

关键词：侧膜组合生花柱喀斯特地区盾叶越南

中文教学在越南的本土化发展——阮国偲博士访谈录

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孔子学院（中英版） 2024年第3期 74-79页

作者：阮国偲王子蕴李睿(翻译) 不详

近年来,越南的“中文学习热”居高不下。2012年,越南相关政府部门将中文列入越南小学和初中的自选课,2021年,越南教育培训部将汉语与俄语、日语、法语定为第一外语。由此,中文进入了越南的国民教育体系,越南的中文教育也在这十年间实现... 详细信息

近年来,越南的“中文学习热”居高不下。2012年,越南相关政府部门将中文列入越南小学和初中的自选课,2021年,越南教育培训部将汉语与俄语、日语、法语定为第一外语。由此,中文进入了越南的国民教育体系,越南的中文教育也在这十年间实现了快速发展,越南民间的中文教育更是发展迅速。

关键词：国民教育体系本土化发展中文学习中文教育中文教学选课小学和初中越南教育

在美中贸易摩擦不断升级背景下提高越南—中国投资贸易合作的效果

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东南亚纵横 2019年第6期 11-13页

作者： [越南]阮国长阮明德李碧华(译) 越南计划投资部发展战略研究院服务业发展战略部越南河内外贸大学广西社会科学院东南亚研究所

美中贸易摩擦自2018年发生以来,对包括越南—中国投资贸易合作关系在内的世界经济产生重大影响。本文旨在对美中贸易摩擦背景下的越中投资贸易合作做一个总体评价,并就新的背景下提高越中投资贸易合作的效果提出一些建议。

关键词：美中贸易摩擦越南—中国投资合作贸易合作

The Roughness of Model Function to the Basis Functions

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Journal of Mathematics and System Science 2013年第8期3卷 385-390页

作者： To Van Ban nguyen Thi Quyen Phan Thu Ha Department of mathematics IT faculty Le Quy Don Technical University 100 Hoang Quoc Viet Cau Giay District Hanoi Vietnam Faculty of Mathematics Hai Phong University 1 71 Phan Dang Luu Kien An District Hai Phong Vietnam

The roughness of the model function f（x） to the basis functions has been identified. When the model function is continuous segment, its roughness does not depend on the behavior of the first segment, but depends on ＂h＂, the shift in the slope of two consecutive segments. If the distribution of design is uniform, f（x） is continuous segment function, and h is constant, then the maximum roughness is h2/192 obtained at the midpoint of the observations. Suppose that we have a sequence of designs {Pn（x）} then its corresponding distribution {Fn （x）} converges weakly to some distribution F（x）. Let D（f） be a set of discontinuous points off（x）, it is possible to take the limit of the roughness if D（f） has zero （dF）-measure. The behavior of maximum roughness of the discontinuous segment function has been studied by using grid points.

关键词： The roughness segment function model function design converge.