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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

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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

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Some Mean Convergence Theorems for the Maximum of Normed Double Sums of Banach Space Valued Random Elements

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Acta Mathematica Sinica,English Series 2024年第7期40卷 1727-1740页

作者： Andrew ROSALSKY Le Van THANH nguyen thi thuy Department of Statistics University of FloridaGainesvilleFL 32611-8545USA Department of Mathematics Vinh UniversityVinhNghe AnViet Nam High School for Gifted Students Vinh UniversityVinhNghe AnViet Nam

In this correspondence,we establish mean convergence theorems for the maximum of normed double sums of Banach space valued random *** of the results pertain to random elements which are *** expand and improve a number of particular cases in the literature on mean convergence of random elements in Banach *** of the main contributions of the paper is to simplify and improve a recent result of Li,Presnell,and Rosalsky[Journal of Mathematical Inequalities,16,117–126(2022)].A new maximal inequality for double sums of M-dependent random elements is proved which may be of independent *** sharpness of the results is illustrated by four examples.

关键词： Double sum mean convergence Rademacher type p Banach space Banach space valued random element M-dependent random elements

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越南学生对汉语网络语言的认知及态度研究

越南学生对汉语网络语言的认知及态度研究

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作者： nguyen thi thuy trang（阮紫彤）郑州大学

学位级别：硕士

随着互联网的迅速发展与普及,大量的网络用语应运而出。近年来接地气的网络词语经常出现在中国政府部门文件以及领导人发言当中。为了与时俱进,作为新中国第一部规范性词典——《现代汉语词典》也收录了被广泛使用且稳定性强的网络新词... 详细信息

随着互联网的迅速发展与普及,大量的网络用语应运而出。近年来接地气的网络词语经常出现在中国政府部门文件以及领导人发言当中。为了与时俱进,作为新中国第一部规范性词典——《现代汉语词典》也收录了被广泛使用且稳定性强的网络新词语。这表明了汉语网络语言已经由小众的专利变成了大众共建、共用、共享的语言产品。汉语网络语言已经渐渐步入人们的日常生活中并成为汉语不可或缺的组成部分。随着中国在国际上的影响力不断扩大,汉语的地位也显著提高,“汉语热”席卷全球,学习汉语的人数不断增加。海外汉语学习者以年轻人居多,该群体对新事物的包容性和接受能力也更强,因此汉语网络语言是他们关注的新焦点,同时也对他们的第二语言学习(即汉语学习)带来巨大的影响。中国与越南是山水相连的友好邻邦。越南本地的汉语教学得到了政府部门的高度重视与大力支持,学习汉语的人数不断创新高,赴华留学的越南留学生也越来越多。越南学生是海外汉语学习者的重要组成部分。目前,网络语言本体研究已获得较为丰硕的成果,但是网络语言在国际中文教育中尚未受到足够的重视。那么,在网络语言实际教学中,教师该“教什么”、“怎么教”才能趋利避害?越南学生对汉语网络语言的认知与态度如何?本文主要采用文献研究法、问卷调查法和综合分析法等方法进行研究。笔者对高级阶段的越南学生进行问卷调查,通过分析调查结果了解越南学生对汉语网络语言的认知、使用情况及态度等问题。调查结果显示,高级阶段的越南学生对汉语网络语言的认知程度与使用频率较高,对汉语网络语言及网络语言教学大多持支持态度。此外,研究还表明,学习时间长短、在中国生活情况、使用汉语交流的频率以及使用中国社交软件的频率等四个因素都直接影响到学生对网络语言的认知程度。之后,笔者基于前人的研究成果,结合实际情况与调查问卷结果,从教师、学生以及学校等三个角度提出汉语网络语言教学与学习的建议。希望本论文能够帮助包括越南学生在内的外国学生加深对汉语网络语言的了解,从而正确运用汉语网络语言,也希望能够为这方面的研究提供新的视角和方向,起到抛砖引玉的作用,为以后的研究尽绵薄之力。

关键词：网络语言越南学生认知态度教学策略

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Generating highly active oxide-phosphide heterostructure through interfacial engineering to break the energy scaling relation toward urea-assisted natural seawater electrolysis

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Journal of Energy Chemistry 2024年第10期97卷 687-699页

作者： Ngoc Quang Tran Nam Hoang Vu Jianmin Yu Khanh Vy Pham nguyen thuy Tien nguyen Tran thuy-Kieu Truong Lishan Peng thi Anh Le Yoshiyuki Kawazoe Center for Innovative Materials and Architectures Vietnam National University Faculty of Materials Science and Technology University of Science Key Laboratory of Rare Earths Ganjiang Innovation Academy Chinese Academy of Sciences Department of Mechanical Engineering Hanbat National University (HBNU) School of Chemical Engineering-Hanoi University of Science and Technology New Industry Creation Hatchery Center Tohoku University

Urea-assisted natural seawater electrolysis is an emerging technology that is effective for grid-scale carbon-neutral hydrogen mass production yet *** scaling relations is an effective strategy to break through the bottleneck of natural seawater ***,by DFT calculation,we demonstrated that the interface boundaries between Ni2P and MoO2play an essential role in the selfrelaxation of the Ni-O interfacial bond,effectively modulating a coordination number of intermediates to control independently their adsorption-free energy,thus circumventing the adsorption-energy scaling *** this conceptual model,a well-defined 3D F-doped Ni2P-MoO2heterostructure microrod array was rationally designed via an interfacial engineering strategy toward urea-assisted natural seawater *** a result,the F-Ni2P-MoO2exhibits eminently active and durable bifunctional catalysts for both HER and OER in acid,alkaline,and alkaline sea water-based *** in-situ analysis,we found that a thin amorphous layer of NiOOH,which is evolved from the Ni2P during anodic reaction,is real catalytic active sites for the OER and UOR ***,such electrode-assembled urea-assisted natural seawater electrolyzer requires low voltages of 1.29 and 1.75 V to drive 10 and600 mA cm-2and demonstrates superior durability by operating continuously for 100 h at 100 mA cm-2,beyond commercial Pt/C || RuO2and most previous reports.

关键词： Break scaling relationships Doping Interfacial engineering Natural seawater splitting Urea electrolysis

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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;Pthis 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

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汉-越形容词重叠式作定语对比研究

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汉字文化 2022年第5期 148-151页

作者： nguyen thi thuy trang 郑州大学文学院 450001

文章对汉语和越南语的形容词重叠式作定语进行对比分析,旨在帮助汉语学习者在学习过程中明晰汉-越形容词重叠式作定语的差异,从而更好地把握难点,避免错误。

关键词：形容词重叠式定语汉-越对比研究

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Influence of different land-use types on selected soil properties related to soil fertility in A Luoi District,Thua thien Hue,Vietnam

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Soil Ecology Letters 2024年第1期6卷 131-140页

作者： Khoa Phuc nguyen Tan Trong Tran Huy Dinh Le Phuong thuy nguyen Hien Thao thi Pham Dien Thanh nguyen Ngu Huu nguyen University of Agriculture and Forestry Hue UniversityHue CityThua Thien Hue 52000Vietnam School of Biotechnology Tan Tao UniversityTan Duc ECityDuc HoaLong An850000Vietnam

Land use type affects the physicochemical properties of *** value of OM and TN is high in acacia *** acidity of soil is considered a serious constraint for *** cash crops are acacia,cassava,banana,rice and *** fertility is affected by land-use types and land management,which exacerbates soil erosion and various other forms of soil degradation in the mountainous regions of *** study was conducted in A Luoi District,Thua thien Hue,Vietnam to identify the effects of land-use types on specific soil physicochemical characteristics related to soil *** physicochemical properties,such as organic matter(OM),total nitrogen(TN),total phosphorous(TP),and K+were significantly affected by land-use *** results showed that the soils were sandy in rice but clay loam for acacia and *** mean bulk density value of acacia soil was significantly greater than that of other *** were higher in the acacia soils than those in the rice,maize,and banana *** OM content was significantly higher in the acacia,cassava,and banana soils than those in the rice and maize *** mean of exchangeable K+in the rice soil was higher compared to those in other soils and was affected by land-use *** high exchangeable acidity content in the soils was probably due to intensive ***,both land use type and management did not affect the CEC ***,the inappropriate land use caused the disturbance of soil physicochemical properties,indicating that the conditions of rice and maize soils are becoming worse than acacia ***,lowering the intensity of cultivation,adopting incorporated soil fertility management,and applying organic fertilizer should preserve the existing conditions and enhance soil properties.

关键词： Land-use types soil characteristics soil frility suitable crop Vietnam

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沈阳南运河地下综合管廊施工阶段风险分析研究

沈阳南运河地下综合管廊施工阶段风险分析研究

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作者：阮氏椎庄（nguyen thi thuy trang）东北大学

学位级别：硕士

随着经济的迅猛发展,城市基础配套设施迅速更新换代,但传统的地下管线直埋方法使得地下空间易形成“马路拉链”与“蜘蛛网”,严重阻碍了地下管线的规范化发展。为了解决这些问题,应加强城市地下综合管廊的投资建设力度,并将各种管线集... 详细信息

随着经济的迅猛发展,城市基础配套设施迅速更新换代,但传统的地下管线直埋方法使得地下空间易形成“马路拉链”与“蜘蛛网”,严重阻碍了地下管线的规范化发展。为了解决这些问题,应加强城市地下综合管廊的投资建设力度,并将各种管线集约铺设,以便于管线后期的运维。作为浅埋地下工程,地下综合管廊施工过程中遇到诸多风险,不利于安全施工。本论文以沈阳市南运河地下综合管廊为研究对象,对南运河地下综合管廊所面临的风险进行系统评估,分类汇总项目的风险因素,从而提出风险评价模型,根据模型所得到的结果提出相应策略,最后基于建筑信息模型BIM建立3D可视化模型,以便直观了解综合管廊施工全过程,从而通过BIM技术解决项目工程的安全控制、质量控制和进度控制中存在的问题。主要研究内容如下:首先,通过查阅相关资料与文献,收集现场工程地质资料,了解现场实际综合管廊施工工艺。根据综合管廊风险管理以及风险分析的研究状况,分析并确定沈阳市南运河地下综合管廊施工风险特征、风险诱发因子,得出风险源,风险源主要包括:地下水文条件、环境条件和施工技术。其次,借助核对表法、经验分析法、专家调查法对南运河地下综合管廊进行风险识别并分级,并根据风险分级结果对行业技术规范风险等级进行调整,并且将风险源分类为自身风险和环境风险。再次,采用层次分析法进行风险评估,提出风险评价模型。以定性和定量集合的方式建立判断矩阵,对施工方法、地层变形、既有建(构)筑物给出各指标权重,进行风险评估,并对结果进行分析与评价,提出对应措施。最后,利用BIM技术建立南运河地下综合管廊的三维模型,模拟节点工序、布置施工现场,分析BIM技术的可视化、模拟性、协调性、优化性和可出图性在设计、施工和运维阶段带来的应用价值,实现设计、施工、运维一体化,印证BIM技术在解决安全控制、质量控制和进度控制中存在的问题时具有一定的作用与价值。

关键词：地下工程管廊风险分析 BIM

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Development of an experimental method for well-controlled blast induced traumatic limb fracture in rats

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Defence Technology（防务技术） 2024年第4期34卷 168-176页

作者： Luyang Xu Xiancheng Yu Clement DFavier Ibidumo Igah thuy-Tien nguyen Warren Macdonald Anthony MJ.Bull Centre for Blast Injury Studies Imperial College LondonLondonUnited Kingdom Department of Bioengineering Imperial College LondonLondonUnited Kingdom Dyson School of Design Engineering Imperial College LondonLondonUnited Kingdom Department of Trauma and Orthopaedics Royal Free London National Health Service Foundation TrustLondonUnited Kingdom

Heterotopic ossification(HO)is a consequence of traumatic bone and tissue damage,which occurs in 65%of military casualties with blast-associated ***,the mechanisms behind blast-induced HO remain *** models are used to study blast-induced HO,but developing such models is challenging,particularly in how to use a pure blast wave(primary blast)to induce limb fracture that then requires an *** studies,including our recent study,have developed platforms to induce limb fractures in rats with blast loading or a mixture of blast and impact ***,these models are limited by the survivability of the animal and repeatability of the *** this study,we developed an improved platform,aiming to improve the animal's survivability and injury repeatability as well as focusing on primary blast *** platform exposed only one limb of the rat to a blast wave while providing proper protection to the rest of the rat's *** obtained very consistent fracture outcome in the tibia(location and pattern)in cadaveric rats with a large range of size and ***,the rats did not obviously move during the test,where movement is a potential cause of uncontrolled *** further conducted parametric studies by varying the features of the design of the *** factors,such as how the limb is fixed and how the cavity through which the limb is placed is sealed,significantly affect the resulting *** platform and test setups enable well-controlled limb fracture induced directly by pure blast wave,which is the fundamental step towards a complete in vivo animal model for blast-induced HO induced by primary blast alone,excluding secondary and tertiary blast *** addition,the platform design and the findings presented here,particularly regarding the proper protection of the animal,have implications for future studies investigating localized blast injuries,such as blast induced brain and lung injuries.

关键词： Blast injury Biomechanics Heterotopic ossification Limb fracture Blast wave Animal model

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Is convenience really king? Comparative evaluation of catastrophic costs due to tuberculosis in the public and private healthcare sectors of Viet Nam: a longitudinal patient cost study

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贫困所致传染病(英文) 2024年第2期13卷 17-28页

作者： nguyen Hoa Binh Quang Vo Luan nguyen Forse Rachel Jeanette Wiemers Anja Maria Christine Huynh Huy Ba Dong thuy thi Thu Phan Yen thi Hoang Creswell Jacob Dang thi Minh Ha nguyen Lan Huu Shedrawy Jad L?nnroth Knut nguyen Tuan Dinh Van Dinh Luong Annerstedt Kristi Sidney Codlin Andrew James National Lung Hospital Ha Noi Viet Nam Friends for International TB Relief Ha Noi Viet Nam Department of Global Public Health WHO Collaboration Centre On Tuberculosis and Social Medicine Karolinska Institute Stockholm Sweden Stop TB Partnership Geneva Switzerland Pham Ngoc Thach Hospital Ho Chi Minh City Viet Nam

Background In Viet Nam, tuberculosis (TB) represents a devastating life-event with an exorbitant price tag, partly due to lost income from daily directly observed therapy in public sector care. Thus, persons with TB may seek care in the private sector for its flexibility, convenience, and privacy. Our study aimed to measure income changes, costs and catastrophic cost incurrence among TB-affected households in the public and private *** Between October 2020 and March 2022, we conducted 110 longitudinal patient cost interviews, among 50 patients privately treated for TB and 60 TB patients treated by the National TB Program (NTP) in Ha Noi, Hai Phong and Ho Chi Minh City, Viet Nam. Using a local adaptation of the WHO TB patient cost survey tool, participants were interviewed during the intensive phase, continuation phase and post-treatment. We compared income levels, direct and indirect treatment costs, catastrophic costs using Wilcoxon rank-sum and chi-squared tests and associated risk factors between the two cohorts using multivariate *** The pre-treatment median monthly household income was significantly higher in the private sector versus NTP cohort (USD 868 vs USD 578;P=0.010). However, private sector treatment was also significantly costlier (USD 2075 vs USD 1313;P=0.005), driven by direct medical costs which were 4.6 times higher than costs reported by NTP participants (USD 754 vs USD 164;Pthis resulted in no significant difference in catastrophic costs between the two cohorts (Private: 55% vs NTP: 52%;P=0.675). Factors associated with catastrophic cost included being a single-person household [adjusted odds ratio [(aOR=13.71; 95% confidence interval (CI): 1.36–138.14;P=0.026], unemployment during treatment (aOR=10.86; 95%CI: 2.64–44.60;P<0.001) and experiencing TB-related stigma (aOR=37.90; 95%CI: 1.72–831.73;P=0.021).Conclusions Persons with TB in Viet Nam face similarly high risk of catastrophic costs whether treated in the

关键词： Tuberculosis Patient cost Catastrophic cost Private sector Comparative analysis Viet Nam

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