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Land subsidence prediction for a new urban mass rapid transit line in Hanoi

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Underground Space 2020年第2期5卷 93-104页

作者： Pham Huy Giao Vu Thi Hue nguyen Dang Han nguyen Thi Hai Anh nguyen ngoc minh Asian Institute of Technology BangkokThailand Institute of Foundation and Underground FECONHanoiViet Nam Sonhai JSC Viet Nam

The rapidly increasing population,urbanization,and industrialization of Hanoi city in the last few decades have necessitated the urgent development of a new underground public transport infrastructure such as the urban mass rapid transit(UMRT)system that is now under ***,concerns on the possible effects of land subsidence on the to-be-constructed and operated UMRT lines must be *** of the difficulties while assessing land subsidence in Hanoi is the insufficient subsidence monitoring ***,a good geotechnical characterization of the subsoil profile and proper numerical analysis can help predict groundwater pumping-induced subsidence *** UMRT line No.2 that was selected for this study is special as it runs across the old quarter downtown,located at the very heart of Hanoi *** this paper,the Hanoi aquifer system,groundwater extraction,and subsidence monitoring network of Hanoi are reviewed *** data from 30 investigation boreholes were analyzed to characterize the subsoil profile underlying a segment of the UMRT line No.2 that consists of both elevated and underground *** soil layers were identified up to a depth of 50 m,including a compressible soft clay layer 10-15 m thick that is supposed to be most vulnerable to subsidence by groundwater *** on the long-term groundwater monitoring data,one-dimensional finite element method(FEM)consolidation analyses were carried out for three drawdown boundary conditions of 5,10,and 15 m and yielded a total subsidence of 0.15,0.35,and 0.5 m,respectively,after 25 years with 1994 as the reference *** results of this study confirmed that land subsidence in particular should be considered in the construction and maintenance of the UMRT lines in Hanoi,in particular for underground sections that are founded on soft to medium clay layers.

关键词： Hanoi aquifer system Groundwater pumping Land subsidence UMRT line Geotechnical characterization

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

Contour blasting parameters by using a tunnel blast design mode

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Journal of Central South University 2021年第1期28卷 100-111页

作者： nguyen ngoc minh CAO Ping LIU Zhi-zhen School of Resources and Safety Engineering Central South UniversityChangsha 410083China Quang Ninh University of Industry Quang Ninh 208650Vietnam

The quality of contour blasting depends on many initial blasting *** parameters including blasthole diameter,rock Protodyakonov coefficient,tunnel area and distance between cracks on the tunnel face are more *** this study,an algorithm linking between Delphi programming language and AutoCAD was created to develop a tunnel blasting *** this model,tunnel contour blasting passport in AutoCAD can be obtained *** effects of rock Protodyakonov coefficient and cracks’distance on blastholes number and specific charge with the variation of blasthole diameter and the semi-circular tunnel face area were investigated to yield a set of equations with the highest *** results show that specific charge increases as rock Protodyakonov coefficient,cracks’distance and drillhole diameter increase,but decreases when tunnel face area *** addition,the number of drillholes increases linearly as tunnel face area increases but decreases when drillhole diameter increases.

关键词： contour blasting blasting model blasting passport tunnel blasting

Prevalence and outcomes of neonates with severe COVID-19:An observational study at Children’s Hospital 1 in Ho Chi minh City,Vietnam

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Asian Pacific Journal of Tropical Medicine 2024年第9期17卷 392-399,I0001页

作者： Phung nguyen The nguyen Tran Thanh Thuc nguyen Thanh Hung Ngo ngoc Quang minh Dang Quoc Duy Tran minh Nhut nguyen Hoang Dung Tran nguyen Ai Nuong Dinh nguyen Cam Tu Department of Pediatrics University of Medicine and Pharmacy at Ho Chi Minh cityHo Chi Minh CityVietnam Children’s Hospital 1 Ho Chi Minh CityVietnam Pediatric Department School of MedicineVietnam National University Ho Chi Minh CityVietnam

Objective:To evaluate the impact of the severe COVID-19 pandemic on neonates and develop strategies to improve their ***:We conducted an observational cross-sectional study at Children's Hospital 1(CH1)from July 25,2021,to May 31,*** neonates who had fever or respiratory symptoms or were born from mothers with COVID-19 and had a positive RT-PCR SARS-CoV-2 result would be *** classified neonates with COVID-19 into 2 groups:mild/moderate and severe for *** between groups were analyzed using Fisher's exact test/Chi-square test for categorical variables and Student's t-test/Wilcoxon Rank Sum test for continuous ***:This study included 88 newborns who had positive RT-PCR SARS-CoV-2 *** severity COVID-19 rate among neonatal cases was found to be 13.6%(12/88),with a corresponding mortality rate of 1.1%(1/88).All severe cases showed lung abnormalities as evident on chest X-ray *** addition to respiratory symptoms,a higher incidence of gastrointestinal manifestations,such as vomiting and diarrhea,was observed in the severe group,indicating a compelling *** administration of anticoagulant and anti-inflammatory drugs in the study group resulted in a satisfactory outcome with no significant ***:The COVID-19 pandemic has had a substantial impact on the well-being of *** management of COVID-19 in this population presents significant challenges.

关键词： COVID-19 Neonate Anti-inflammatory Anticoagulant

Overview of Cretaceous Non-Marine Deposits and Their Palaeoclimatic Characteristics in the North of Vietnam

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Open Journal of Geology 2019年第10期9卷 688-691页

作者： nguyen Xuan Khien nguyen Thi minh ngoc Vietnam Union of Geological Sciences (VUGS) Hanoi Vietnam Faculty of Technology & Information Security PSA Hanoi Vietnam

The Cretaceous non-marine deposits play an important role in the history of formation and evolution of Earth’s crust in northern territory of Vietnam. According to analyzing results of material composition and depositional environments, these deposits can be divided into three lithofacies assemblages, such as proluvial-deluvial, fluviatile and lacustrine lithofacies. These Cretaceous non-marine sequences in the North of Vietnam indicate a typically continental hot and dry palaeoclimatic regime.

关键词： Cretaceous Non-Marine Lithofacies Palaeoclimate Ripple-Marks Shrinkage Cracks North of Vietnam

Groundwater status and associated issues in the Mekong-Lancang River Basin： International collaborations to achieve sustainable groundwater resources

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Journal of Groundwater Science and Engineering 2017年第1期5卷 1-13页

作者： Eunhee Lee Kyoochul Ha nguyen Thi minh ngoc Adichat Surinkum Ramasamy Jayakumar Yongje Kim Kamaludin Bin Hassan Korea Institute of Geosciences and Mineral Resources Daejeon 34132 Korea CCOP Technical Secretariat Bangkok 10400 Thailand UNESCO Bangkok Office Bangkok 10110 Thailand

Groundwater is an important and readily available source of fresh water in the Mekong-Lancang River Basin. With a rapid population growth and increasing human activities, an increasing number of countries in the Mekong-Lancang River Basin are experiencing depleted and degraded groundwater supplies. In transboundary river basins, such as the Mekong-Lancang River, prioritizing the use of the shared aquifer by one riparian government may affect the opportunities of other riparian governments and lead to potential water conflicts between neighboring countries. To promote the sharing of strategies and information for the sustainable and equitable use of water resources of the shared basin, international collaborative workshops on groundwater resources have been organized for all Mekong-Lancang River countries. These workshops provide an opportunity to communicate and discuss nationally sensitive issues on groundwater by the associated countries, with topics covering multiple aspects of groundwater, such as the groundwater status in the basin, quality issues, water use conflicts, hydrological information gaps, management policies and capacity building for successful water resource management. Consensus has been reached by all countries on the importance of catchment-based groundwater management and the need for close communication among the countries. Strategies for managing transboundary aquifer issues must foster international collaboration based on the regional network, influence national networks and enhance the capacity to building maps and monitoring systems based on associated databases. The sustainability of water resources cannot be achieved without the integrated involvement and contributions by multiple countries and various stakeholders. Therefore, collaborative workshops provide a great opportunity to further our understanding of the hydrologic processes of the Mekong River Basin, share the benefits of the aquifer and provide a strategy and vision for sustain

关键词： Groundwater Sustainability International collaboration Mekong-Lancang River Basin

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越南河内美食旅游资源开发研究

越南河内美食旅游资源开发研究

作者： nguyen minh ngoc（阮明玉）东南大学

学位级别：硕士

近年来,随着社会经济的快速发展和人们生活水平不断的提高,旅游渐渐成为人类生活当中必不可少的基本需求。在如今的社会,人们追求的不仅是物质上的吃好穿美问题而且还需要精神上的供养:花钱去旅行。因此,旅游也被美称为“无烟工业”,旅... 详细信息

近年来,随着社会经济的快速发展和人们生活水平不断的提高,旅游渐渐成为人类生活当中必不可少的基本需求。在如今的社会,人们追求的不仅是物质上的吃好穿美问题而且还需要精神上的供养:花钱去旅行。因此,旅游也被美称为“无烟工业”,旅游业的发展将带动整个经济链的稳步发展。新时代的旅游者不仅仅追求单纯的观光旅游传统形式,而更希望提高旅游的文化知识,加强自己在旅游过程中的参与性和体验性。美食旅游是旅游新颖的一种形式,选择美食旅游形式,游客既可以通过美食品尝和各种饮食烹饪相关活动来满足自己想要的参与性和体验性,也可以提高对旅游目的地的历史文化知识。这有利于当地文化的发展与传承,对旅游业的发展有重要的作用。越南由于地形狭长,形成了在不同的地区拥有属于自己的特色饮食文化,再经过历时变迁之后,不断交流融合,最终会聚成了越南饮食文化,同时还能保留各地方的传统美食佳肴。首都河内也不是例外。河内美食的精髓体现于菜肴烹饪的方法,品尝美食的姿态和食客与厨师之间的情感。河内美食的每道菜都有特征的味道和独特的魅力,它不仅是平常的食物,而被人们视为在烹饪的艺术。因此,如何开发利用河内美食资源来发展旅游对越南人尤其是河内人来说是当前的一个热题。本文通过文献查找、资料收集,并对河内美食旅游资源进行实地考察,在获取河内美食旅游资源的材料与信息之后,总结出河内美食旅游资源的特色,力求发现科学且符合实际的河内特色美食旅游资源开发策略。本文共分为六章。第一章主要介绍论文的研究背景与意义、文献综述、研究方法及内容。第二章阐述了美食旅游的理论研究:美食旅游的概念、理论依据、重要特点和基本功能。第三章进行分析河内美食旅游资源的构成要素、资源特点并介绍一些河内特色菜肴。第四章为分析河内美食旅游资源开发现状与问题。第五章在提供河内美食旅游资源开发的策略,其中包括:开发原则、市场定位、空间分布、多样产品、营销手段、基础设施、人才培养,并且设计出几条美食旅游精品线路。最后第六章为研究结论与展望。

关键词：美食美食旅游资源开发河内

Prevalence and risk factors associated with long COVID symptoms in children and adolescents in a southern province of Vietnam

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Asian Pacific Journal of Tropical Medicine 2024年第3期17卷 119-128,I0001,I0002页

作者： Huynh ngoc Linh nguyen The Tan Le Thi minh Thu nguyen Tu Loan nguyen Thi To Uyen Le Thanh Thao Trang Truong Thanh Nam Doan Hoang Phu Faculty of Medicine Ca Mau Medical CollegeCa Mau 98000Vietnam Ca Mau Obstetrics and Pediatrics Hospital Ca Mau 98000Vietnam Faculty of Basic Science and Public Health Dong Thap Medical CollegeDong Thap 81000Vietnam Graduate University of Sciences and Technology Vietnam Academy of Science and TechnologyHa Noi 10000Vietnam Community Public Health Research Program School of Public HealthWalailak UniversityNakhon Si Thammarat 80160Thailand Faculty Public Health Can Tho University of Medicine and PharmacyCan Tho City 94000Vietnam Doctoral Program in Health Sciences College of Graduate StudiesWalailak UniversityNakhon Si Thammarat 80160Thailand

Objective:To investigate the prevalence and risk factors associated with long COVID symptoms among children and adolescents who have recovered from ***:This study applied a cross-sectional approach within community settings in a southern province of Vietnam.A structured questionnaire featuring socio-demographic information and common long COVID symptoms was *** correlation coefficients assessed associations among pairs of long COVID ***,multivariable logistic regression models were performed to investigate the risk factors of long COVID in recovered COVID-19 children and ***:Among 422 participants,39.3%reported long COVID symptoms,with a prevalence of 45.2%(SD=0.5)in children and 22.2%(SD=0.4)in *** symptoms reported were cough 34.6%(SD=0.5),fatigue 20.6%(SD=0.4),shortness of breath 10.9%(SD=0.3),and lack of appetite 6.6%(SD=0.3).Concerning risk factors of long COVID,a higher risk was observed among demographic groups,including girls(OR 1.25,95%CI 1.15-1.37;P<0.001,reference:boys),children compared to adolescents(OR 1.24,95%CI 1.12-1.37;P<0.001),overweight individuals(OR 1.14,95%CI 1.02-1.27;P=0.018,reference:healthy weight),and participants without any COVID-19 vaccination(OR 1.36,95%CI 1.20-1.54;P<0.001),or have received only one single dose(OR 1.35,95%CI 1.10-1.64;P=0.004)compared to those who have received two ***,patients with a COVID-19 treatment duration exceeding two weeks also had a higher risk of long COVID(OR 1.32,95%CI 1.09-1.60;P=0.003)than those who recovered less than seven ***:The insights from this study provide crucial guidance for predicting the factors associated with the occurrence of long COVID in pediatric patients,contributing to strategic interventions aimed at mitigating the long COVID risks among children and adolescents in Vietnam.

关键词： Long COVID Prevalence Risk factors Children Adolescent Vietnam

Truly optimal semi-active damping to control free vibration of a single degree of freedom system

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Theoretical & Applied Mechanics Letters 2024年第2期14卷 142-145页

作者： Viet Duc La ngoc Tuan nguyen Institute of Mechanics Vietnam Academy of Science and TechnologyHanoi 10000Vietnam Graduate University of Science and Technology Vietnam Academy of Science and TechnologyHanoi 10000Vietnam

This paper studies a single degree of freedom system under free vibration and controlled by a general semiactive damping.A general integral of squared error is considered as the performance index.A one-time switching damping controller is proposed and *** pontryagin maximum principle is used to prove that no other form of semi-active damping can provide the better performance than the proposed one-time switching damping.

关键词： Analytical optimization Quadratic integral Lyapunov equation Pontryagin maximum principle