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Novel Criteria for Exponential Stability of Linear Non-Autonomous Functional Differential Equations

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Journal of Systems Science & Complexity 2019年第2期32卷 479-495页

作者： PHAM HUU ANH ngoc THAI BAO Tran CAO THANH Tinh nguyen DINH Huy Department of Mathematics Vietnam National University-HCMC International University Faculty of Information Systems Vietnam National University-HCMC University of Information Technology Department of Mathematics Vietnam National University-HCMC University of Information Technology Division of Applied Mathematics Faculty of Applied Sciences Vietnam National University-HCMC Ho Chi Minh city University of Technology

General linear non-autonomous functional differential equations are considered. Explicit criteria for exponential stability are given. Furthermore, the authors present an explicit robust stability bound for systems su... 详细信息

关键词： Exponential stability linear functional differential equations perturbation

Fabrication and Characterization of Multi-layer Heat Mirror with Photocatalytic Properties

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Chinese Physics Letters 2009年第11期26卷 152-155页

作者： Tran Le Tuan Tran Huu Chi nguyen Dac ngoc Son Luu Minh Nam Hoang Dinh Quan nguyen Department of Applied Physics College of Natural Science National University of He Chi Mirth City 227 Nguyen Van Cu District 5 Ward 4 He Chi Minh City Vietnam Department of Chemical Engineering College of Technology National University of He Chi Minh City 168 Ly Thuong Kiet District 10 Ho chi Minh City Vietnam

A novel TiO2（5）/TiO2（buffer）/Ti（4）/Ag（3）/Ti（2）/TiO2（1） multi-layer film coating with corning glass is designed and fabricated by a dc magnetron sputtering method as a renovation of the well-known TiO2/Ti/Ag/Ti/TiO2 system in order to obtain a heat mirror system with photocatalytic properties due to sufficient thickness of the Ti02 layer. The outer TiO2 layer is fabricated in two steps, possibly claimed as two layers TiO2（5） and TiO2（buuer）, among which TiO2（buffer） the 70-nm-thick layer deposited in poor oxygen effectively minimizes the oxidation toward its neighbor Ti（4） layer. The optimal total thickness of the TiO2（5） and TiO（buffer） di-layer is found to be 300nm to yield a highly photo-catalytic property of the film without affecting the optical properties considerably. This multi-layer film can transmit light of above 75-85% in the visible spectrum （380 ≤ λ≤ 760 nm） and reflect radiation of above 90% in the infrared spectrum （ λ≥760 nm）. Such multi-layer coatings are strongly recommended not only as promising transparent heat mirrors but also as photo-catalytic films for architectural window coatings.

关键词： Condensed matter: electrical magnetic and optical Surfaces interfaces and thin films Chemical physics and physical chemistry

EXISTENCE AND STABILITY OF PERIODIC AND ALMOST PERIODIC SOLUTIONS TO THE BOUSSINESQ SYSTEM IN UNBOUNDED DOMAINS

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Acta Mathematica Scientia 2022年第5期42卷 1875-1901页

作者： Thieu Huy nguyen Truong Xuan PHAM Thi ngoc Ha VU The Sac LE School of Applied Mathematics and Informatics Hanoi University of Science and Technology Vien Toan ung dung va Tin hocDai hoc Bach khoa Hanoi 1DaiCoVietHanoiVietnam Department of Mathematics Faculty of Information TechnologyThuyloi university Khoa Cong nghe Thong tinBo mon ToanDai hoc Thuy loi175 Tay SonDong DaHa NoiViet Nam Thuyloi University Dai hoc Thuy Loi175 Tay SonDong DaHanoiViet Nam

In this paper we investigate the existence and stability of periodic solutions(on a half-line R_(+))and almost periodic solutions on the whole line time-axis R to the Boussinesq system on several classes of unbounded domains of R^(n) in the framework of interpolation *** the linear Boussinesq system we combine the L^(p)—L^(q)-smoothing estimates and interpolation functors to prove the existence of bounded mild ***,we prove the existence of periodic solutions by invoking Massera’s *** also prove the existence of almost periodic *** we use the results of the linear Boussinesq system to establish the existence,uniqueness and stability of the small periodic and almost periodic solutions to the Boussinesq system using fixed point arguments and interpolation *** results cover and extend the previous ones obtained in[13,34,38].

关键词： Boussinesq systems periodic solutions almost periodic solutions unbounded domains smoothing estimates dual estimates interpolation spaces stability

Cr/nanodiamond composite plating with cobalt cation additive

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中国有色金属学会会刊：英文版 2009年第4期19卷 975-978页

作者： Viet-Hue nguyen Thi-Nam HOANG ngoc-Phong nguyen Sik-Chol KWON Man KIM Joo-Yul LEE Institute of Materials Science Korea Institute of Materials Science

The effect of cationic additive on Cr/nanodiamond plating was *** plating was performed in Sargent *** of deposit was observed by scanning electron microscope(SEM);microhardness by hardness tester;wear rate by tribometer;amount of diamond in deposit by combustion method and passivity by potentiodynamic *** results show that in the presence of cobalt cation,the amount of nanodiamond particle in the deposit is *** increasing diamond particle amount,the metallurgical,mechanical and electrochemical properties of Cr/nanodiamond deposit are ***,this improvement seems to be *** the presence of 10 g/L of nanodiamond powder and 2.5 g/L of cobalt cation in the bath,the amount of diamond particle in deposit is increased by 4 times;and wear rate of Cr-Co/nanodiamond deposit is decreased by 2-3 times as compared with pure Cr/*** passive current of Cr-Co/nanodiamond composite deposit is decreased from 18 to 8 μ*** morphology of Cr/nanodiamond is smooth remarkably in the presence of cobalt cation.

关键词：纳米金刚石粉复合镀层钴离子镀铬添加剂金刚石颗粒扫描电子显微镜形态观察

Gravitationally lensed extended sources: the case of QSO RXJ0911

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Research in Astronomy and Astrophysics 2013年第7期13卷 803-814页

作者： Do Thi Hoai Pham Tuyet Nhung Pham Tuan Anh Frederic Boone Pierre Darriulat Pham ngoc Diep Pham ngoc Dong nguyen Van Hiep nguyen Thi Thao VATLY INST179Hoang Quoc VietCau GiayHanoiVietnam IRAP 14avenue Edouard BelinF31400 ToulouseFrance

After a brief reminder of the mechanism of gravitational lensing of ex- tended sources, the particular case of the host galaxy of QSO RXJ0911, a high red-shift （z - 2.8） quadruply imaged quasar, is explored. The non linearity of the problem, together with the proximity of the source to a cusp of the lens inner caustic, has impor-tant consequences on the dependence of the image appearance on the size and shape of the source. Their expected main features and their interpretation in terms of source extension and shape are investigated in a spirit of simplicity and in preparation for the analysis of high sensitivity and spatial resolution images that will soon be within reach with the completion of the Atacama Large Millimeter/submillimeter Array （ALMA）. In particular, the information on source size carded by relative image brightness is dis-cussed. Extension of the results to other types of quadruply imaged quasars is briefly considered.

关键词： gravitational lensing - galaxies: high-redshift

Empirical Analysis on Impact Factors of Green Marketing on Consumer's Willingness to Buy Hygiene Products in Vietnam

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Empirical Analysis on Impact Factors of Green Marketing on C...

作者： nguyen ngoc MINH AN 北京化工大学

学位级别：硕士

COVID-19大流行给越南整体经济带来许多变化,特别是个人和家庭卫生行业。随之而来的是环保意识的增强和各种规模的绿色营销活动的爆发。然而,目前并没有研究关注绿色营销对消费者购买卫生用品意愿的影响。因此,论文以越南为研究对象,针... 详细信息

COVID-19大流行给越南整体经济带来许多变化,特别是个人和家庭卫生行业。随之而来的是环保意识的增强和各种规模的绿色营销活动的爆发。然而,目前并没有研究关注绿色营销对消费者购买卫生用品意愿的影响。因此,论文以越南为研究对象,针对绿色营销对消费者购买卫生用品意愿的影响因素展开实证分析。论文主要工作:(1)研究以4P理论为基础,通过调查问卷的形式对350名受访者的购买意愿进行调查。(2)构建逻辑回归模型,对影响购买意愿的人口统计因素进行探究。(3)引入SEM模型,探究绿色促销、绿色产品、绿色价格和绿色场所对卫生用品购买意愿的影响。论文主要结论:(1)350份调查问卷中,回收了342份有效问卷,并通过了相关检验测试。(2)受访者中,性别、收入和认知度是影响购买决策的关键因素。(3)除绿色促销外、绿色产品、绿色价格和绿色场所均对卫生用品的购买行为产生显著的正向影响。然而,作用强度间存在显著差异,回归系数分别为0.255、0.106和0.191。基于主要结论,文章从绿色促销、绿色产品、绿色价格和绿色场所方面提出了一些政策建议,以期为增强绿色营销对消费者购买意愿的影响。

关键词：绿色营销卫生用品购买意

Effect of land use change on water discharge in Srepok watershed,Central Highland,Viet Nam

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International Soil and Water Conservation Research 2014年第3期2卷 74-86页

作者： nguyen Thi ngoc Quyen nguyen Duy Liem nguyen Kim Loi Tay nguyen University Viet Nam.567 Le Duan streetBuon Ma Thuot CityDak Lak Province Nong Lam University Viet Nam.Linh Trung WardThu Duc districtHo Chi Minh City

Srepok watershed plays an important role in Central Highland in Viet *** impacts to developing social-economic ***,it is necessary to research elements which impact to natural resources in this *** Soil and Water Assessment Tool(SWAT)model and Geography Information System(GIS)were used to simulate water discharge in the Srepok *** objectives of the research were to apply GIS and SWAT model for simulation water discharge and then,we assessed land use change which impacted on water discharge in the *** observed stream flow data from Ban Don Stream gauge station was used to calibrate for the period from 1981 to 2000 and then validate for the period from 2001 to *** using SWAT-CUP software to calibration,NSI reached 0.63 and R square value achieved 0.64 from 2004 to 2008 in calibration and NSI gained good level at 0.74 and R square got 0.75 from 2009 to 2012 in validation step at Ban Don *** that,land cover in 2010 was processed like land cover in 2000 and set up SWAT model *** simulated water discharge in scenario 1(land use 2000)was compared with scenario 2(land use 2010),the simulation result was not significant difference between two scenarios because the change of area of land use was not much enough to affect the fluctuation of water ***,the effect of land cover on water resource could be seen clearly via total water *** percentage of surface flow in 2000 was twice times more than in 2010;retard and base flow in 2000 was slightly more than in ***,decreased surface flow,increased infiltration capacity of water and enriched base flow resulted in the growth of land cover.

关键词： Water discharge Land use change GIS SWAT model Simulations

The Impact of Transport Infrastructure on Foreign Direct Investment Inflows:A Comparative Analysis of Landlocked and Coastal Countries in Developing Asia

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The Impact of Transport Infrastructure on Foreign Direct Inv...

作者： nguyen ngoc HA 上海财经大学

学位级别：硕士

In today's globalized economy,foreign direct investment(FDI)has been identified as an important driver of economic growth in developing Asian ***,the inflow of FDI is influenced by various factors,and FDI in each region,each country,and each group of economies may involve different set of determinants depending on the destination's own economic,geographical or political characteristics,as well as the investing motives of the *** study examines the impact of infrastructure on FDI inflows in developing Asian countries,with a particular focus on the differences between landlocked and coastal *** results show that transport infrastructure and gross fixed capital formation(GFCF)as a comprehensive proxy for infrastructure have a positive and significant impact on FDI inflows in landlocked ***,for coastal countries,transport infrastructure has no significant effect on FDI *** findings have important theoretical and managerial implications for policymakers to consider when making decisions about infrastructure development and FDI attraction strategies in developing Asian countries.

关键词： FDI developing countries Asia infrastructure transport landlocked countries determinants

How knowledge of hepatitis B disease and vaccine influences vaccination practices among parents in Ho Chi Minh City, Vietnam

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Asian Pacific Journal of Tropical Medicine 2021年第3期14卷 122-127页

作者： Giao Huynh Le An Pham Thien Thuan Tran ngoc Nga Cao Thi ngoc Han nguyen Quang Vinh Bui Faculty of Public Health University of Medicine and Pharmacy at Ho Chi Minh CityVietnam Center for Training of Family Medicine University of Medicine and Pharmacy at Ho Chi Minh CityVietnam Department of Infectious Diseases University of Medicine and Pharmacy at Ho Chi Minh CityVietnam Infection Control Department University Medical Center at Ho Chi Minh CityVietnam Department of Pediatrics University of Medicine and Pharmacy at Ho Chi Minh CityVietnam

Objective:To assess the influences of the knowledge of parents about hepatitis B virus(HBV)infection and the benefit of HBV vaccination on the practice of HBV vaccination among ***:A prospective cross-sectional study recruited parents whose children,aged 12-24 months,received HBV vaccination at Commune Health Centers(CHCs)in Ho Chi Minh City from Feb.2016 to *** were interviewed using a questionnaire that included 11-item binary knowledge questions and checked their children’s vaccination ***:A total of 768 parents had a mean age of(30.8±5.1)*** mean knowledge score of the 11-item questions was(7.0±2.4).The knowledge score was positively associated with full and timely HBV *** addition,children who received complete and timely HBV vaccination were significantly more likely to live in rural areas(Adjusted OR 4.02,95%CI 2.79-5.79,P<0.001).Also,children whose parents received vaccination information from health care providers,and had knowledge about HBV risk,had a higher rate of full and timely HBV vaccination(Adjusted OR 1.60,95%CI 1.13-2.29,and Adjusted OR 1.47,95%CI 1.01-2.13,P all<0.05).Conclusions:Parents possessed a great deal of incorrect knowledge about *** health education from health care providers should target parents living in specific locations and focus on the benefits of HBV vaccine.

关键词： Knowledge Hepatitis Health Belief Model Vaccination Questionnaire