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A comparative study on kinetics and dynamics of two dump truck lifting mechanisms using MATLAB simscape

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Theoretical & Applied Mechanics Letters 2024年第2期14卷 146-156页

作者： Thong Duc Hong Minh Quang Pham son cong Tran Lam Quang Tran Truong Thanh Nguyen Faculty of Transportation Engineering Ho Chi Minh City University of Technology(HCMUT)Ho Chi Minh City 700000Vietnam Vietnam National University Ho Chi Minh City(VNU-HCM) Ho Chi Minh City 700000Vietnam Industrial Maintenance Training Center Ho Chi Minh City University of Technology(HCMUT)Ho Chi Minh City 700000Vietnam

In this paper,two lifting mechanism models with opposing placements,which use the same hydraulic hoist model and have the same angle of 50°,have been *** mechanical and hydraulic simulation models are established using MATLAB Simscape to analyze their kinetics and dynamics in the lifting and holding *** simulation findings are compared to the analytical calculation results in the steady state,and both methods show good *** the early lifting stage,Model 1 produces greater force and discharges goods in the container faster than Model ***,Model 2 reaches a higher force and ejects goods from the container cleaner than its counterpart at the end lifting *** established simulation models can consider the effects of dynamic loads due to inertial moments and forces generated during the system *** is crucial in studying,designing,and optimizing the structure of hydraulic-mechanical systems.

关键词： Dump truck Lifting mechanism Hydraulic MATLAB Simscape Kinetic dynamic analysis

Copper-based nanomaterials as peroxidase candidates for intelligent colorimetric detection and antibacterial applications

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Particuology 2024年第1期84卷 126-135页

作者： Yanyan Huang Huimin Zhong cong Jiang Jiahui Yang Jingwen Zhang Fei Zhao Chaoqun Liu College of Light Industry and Food Engineering Nanjing Forestry UniversityNanjing210037China College of Pharmacy Institutes of Environment and MedicineHenan UniversityKaifeng475004China

With natural polyphenol compound tannic acid(ta)as the ingredient,copper tannate(Cuta)nanolayer material was formed by self-assembly under the conditions of heating and copper *** ion and tannic acid could coordinate to form Cu-O-C structure which was similar to the Fe-N-C structure of natural heme *** addition,the obtained Cuta nanomaterial possessed excellent peroxidase-like catalytic activity and *** on this excellent enzymatic activity,Cuta nanomaterials could be used for colorimetric detection of hydrogen peroxide with a smartphone and decomposition of organic *** on the structural characteristics and catalytic activity,the copper tannate nanozymes could also serve as potential antibacterial reagents to effectively inhibit the growth of gram-negative and positive bacteria in a low hydrogen peroxide *** work may promote the exploration of novel peroxidase mimetics and broaden the applications of nanozymes.

关键词： Nanozyme Colorimetric detection Smartphone Antibacteria

Exploring the Interplay between Job Stress,Work Performance,and Attitudes toward Professional Psychological Help among Employees

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International Journal of Mental Health Promotion 2024年第7期26卷 531-545页

作者： cong Minh Le son Van Huynh Ky Luu Quynh-Nhi Ngoc Ho Van Thi Le Nguyen Vinh-Long Tran-Chi Center for Mental Health Research and Support University of Social Sciences and HumanitiesVietnam National University Ho Chi Minh CityHo Chi Minh City700000Vietnam Faculty of Psychology Ho Chi Minh City University of EducationHo Chi Minh City700000Vietnam Faculty of Tourism College of BusinessUniversity of Economics Ho Chi Minh CityHo Chi Minh City700000Vietnam Scientific Management Department Dong A UniversityDa Nang500000Vietnam

Objective:This study explores the interplay between job stress,job-related factors,work performance,and attitudes toward seeking professional psychological help among Vietnamese ***:A total of 374 employees in Vietnam were surveyed using random sampling and an online questionnaire from November 07 to November 28,*** data and self-reported from three scales:The New Job Stress Scale(NJSS),Work Performance(WP),and Attitudes Toward Seeking Professional Psychological Help(ATSPPH_SF)were ***:Significant variations were found across several variables,including forms of work,operating hours,education levels,monthly income,numbers of daily working hours,and the presence of a psychological counseling department within the *** analysis has highlighted direct relationships between key latent *** who were more open to seeking professional help tended to report higher levels of job *** negative relationship was found between job stress and attitudes toward seeking professional ***,work effort was positively associated with work *** analyses revealed the influence of co-worker support on role expectation conflict and work effort,role expectation conflict and work-life balance,as well as interactions between role expectation conflict and attitudes needed toward seeking professional *** analyses showed that work effort mediated relationships between openness to seeking professional help,co-worker support,work-life balance,role expectation conflict,and work *** toward seeking professional help also mediated relationships between work-life balance,job stress,and work ***:The study highlights the complex dynamics surrounding job stress,job-related factors,work performance,and attitudes toward seeking professional psychological help among Vietnamese *** highlights the importance of addressing help-seeking barriers,promoting work engagement

关键词： Stress co-worker support work-life balance role expectation conﬂict professional psychological help-seeking

DENSITY ESTIMATES FOR SOLUTIONS OF STOCHASTIC FUNCTIONAL DIFFERENTIAL EQUATIONS

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Acta Mathematica Scientia 2019年第4期39卷 955-970页

作者： Nguyen Tien DUNG ta cong son Tran Manh CUONG Nguyen Van taN Trinh Nhu QUYNH Department of Mathematics FPT University Hoa Lac High Tech Park Hanoi Vietnam Department of Mathematics VNU Hanoi University of Science 334 Nguyen Trai Thanh Xuan Hanoi Vietnam Department of Foundation Academy of Cryptography Techniques Hl Chien Thang Thanh Tri Hanoi Vietnam Military Information Technology Institute 17 Hoang Sam Cau Giay Hanoi Vietnam

In this article, we investigate the density of the solution to a class of stochastic functional differential equations by means of Malliavin calculus. Our aim is to provide upper and lower Gaussian estimates for the d... 详细信息

关键词： Stochastic functional differential equations density estimates Malliavin calculus

Current status of genetic transformation technology developed in cucumber(Cucumis sativus L.)

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Journal of Integrative Agriculture 2015年第3期14卷 469-482页

作者： WANG Shun-li Seong Sub Ku YE Xing-guo HE cong-fen Suk Yoon Kwon Pil son Choi Key Laboratory of Biology and Genetic Improvement of Horticultural Crops Ministry of Agriculture/Institute of Vegetables and Flowers Chinese Academy of Agricultural Sciences Department of Oriental Pharmaceutical Development Nambu University Institute of Crop Science Chinese Academy of Agricultural Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement School of Sciences Beijing Technology and Business University Plant Systems Engineering Research Center

Genetic transformation is an important technique for functional genomics study and genetic improvement of plants. Until now, Agrobacterium-mediated transformation methods using cotyledon as explants has been the major approach for cucumber, and its frequency has been up to 23%. For example, significantly enhancement of the transformation efficiency of this plant species was achieved from the cotyledon explants of the cultivar Poinsett 76 infected by Agrobacterium strains EHA105 with efficient positive selection system in lots of experiments. This review is to summarize some key factors influencing cucumber regeneration and genetic transformation, including target genes, selection systems and the ways of transgene introduction, and then to put forward some strategies for the increasing of cucumber transformation efficiency. In the future, it is high possible for cucumber to be potential bioreactor to produce vaccine and biomaterials for human beings.

关键词： Cucumis sativus L. plant regeneration genetic transformation positive selection system

S-E-MBR:一种基于E-MBR码的分布式存储系统扩容方法

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软件导刊 2024年第1期23卷 90-96页

作者：黎聪唐聃成都信息工程大学软件工程学院四川省信息化应用支撑软件工程技术研究中心四川成都610225

随着数据量的激增,以再生码为容错机制的分布式存储系统需要使用扩容技术扩充其存储容量。然而现有再生码扩容方法较少,在扩容时间与传输量方面有待提高。为此,针对在线分布式存储场景提出一种扩容方法 S-EMBR,以更高效的迁移方式降低... 详细信息

随着数据量的激增,以再生码为容错机制的分布式存储系统需要使用扩容技术扩充其存储容量。然而现有再生码扩容方法较少,在扩容时间与传输量方面有待提高。为此,针对在线分布式存储场景提出一种扩容方法 S-EMBR,以更高效的迁移方式降低迁移的数据块数量和I/O开销,减少校验更新时所需数据块,使其达到了理论数据块迁移量最优值。理论分析与实验结果表明,与RR与Scale-RS方法相比,S-E-MBR方法扩容时的数据传输量分别减少了52.7%~77.9%和41.3%~50.4%,扩容总时间分别减少了72.3%~75.4%和50.6%~53.5%,响应速度分别提升了39.2%和17.1%,可满足在线扩容场景需求。

关键词：再生码扩容方法分布式存储纠删码传输量

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藏区重症监护病房首例耐碳青霉烯类鲍曼不动杆菌感染患者相关环境污染及患者感染情况

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中国感染控制杂志 2024年第2期23卷 220-224页

作者：切措塔何定英龙芙艳张小花彭春花蒋湘翔邓明雷付聪左国平九寨沟县人民医院医院感染管理科四川阿坝州623400 九寨沟县人民医院综合科九寨沟县人民医院检验科四川阿坝州623400 九寨沟县人民医院ICU 四川阿坝州623400 九寨沟县人民医院呼吸科四川阿坝州623400

目的调查藏区某院新建重症监护病房(ICU)中首例耐碳青霉烯类鲍曼不动杆菌(CRAB)感染患者相关环境污染及患者感染情况,分析传播风险。方法从2021年11月15日检出的首例CRAB患者入住ICU开始至第60天期间,对入住ICU>48 h的所有患者进行CRA... 详细信息

目的调查藏区某院新建重症监护病房(ICU)中首例耐碳青霉烯类鲍曼不动杆菌(CRAB)感染患者相关环境污染及患者感染情况,分析传播风险。方法从2021年11月15日检出的首例CRAB患者入住ICU开始至第60天期间,对入住ICU>48 h的所有患者进行CRAB主动筛查;在首例CRAB感染患者入住ICU第30天高频开展诊疗活动2 h后未消毒前、第60天消毒后未开展医疗活动前的环境分别采样,CRAB显色培养基培养。结果主动筛查的13例患者中1例CRAB阳性,该病例于11月19日由三级医院ICU转入该院ICU,入住ICU第40天出现发热、吸痰需求增加并检出CRAB,药敏谱与首例病例相似,且安置于首例病例邻床。采样环境标本64份,CRAB阳性9份,阳性率14.06%,其中高频诊疗活动后洗手池、门把手、床栏等8个采样位点CRAB阳性,常规消毒后洗手池水槽检出CRAB。结论在民族地区基层ICU CRAB防控工作中,对入科患者进行风险评估,高风险患者入科即采取集束化防控措施是可行的;应重点关注洗手池、门把手、床栏等区域污染及洗手池水槽消毒的有效性。

关键词：耐碳青霉烯类鲍曼不动杆菌环境污染医院感染重症监护病房民族地区基层医院

Study on the Correlation between 137Cs Loss and Soil Erosion in Central Highlands of Vietnam

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Journal of Environmental Science and Engineering(A) 2014年第2期3卷 117-122页

作者： Trinh cong Tu Phan son Hai Central Highlands Soils Fertilizers and Environment Research Center Buon Ma Thuot 55999 Vietnam Nuclear Research Institute Dalat 61999 Vietnam

Isotope of 137Cs appeared in the environment by nuclear weapon tests in the atmosphere in the 1950s and 1960s. When the 137Cs deposited to the ground, they were absorbed strongly and quickly by exchanging positions with other elements, and it had no ability to decompose in most of the environments. Redistribution of this isotope after settled down into the soil mainly occurs due to redistribution of soil surface. Research on the correlation between 137Cs loss and soil erosion was done in 2009, at 24 sites, on basaltic soil with slopes of 20%-25%. Statistical analysis by linear regression of experimental data according to equation ofy = a × xb got coefficients of a and b. They are 20.123 and 1.0967, respectively. The correlation ofy = 20.123 × x1.0967 was tested with error of 7.3%-35.8% between the actual soil loss and calculating. This correlation was applied to evaluate soil erosion rates in two catchments of Buon Yong and Ea Kao belonging to Dak Lak province, thereby giving soil erosion rates ranging from 3.44 t-ha-1 to 26.38 t-ha-1, depending on the conditions of sloping land and cover crops.

关键词： Catchment isotope of 137Cs soil erosion standardization.

Synthesis of cation exchange resin-supported iron and magnesium oxides/hydroxides composite for nitrate removal in water

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Chinese Journal of Chemical Engineering 2021年第4期34卷 378-384页

作者： Trung Thanh Nguyen Vu Anh Khoa Tran Le Ba Tran Phuoc Toan Phan Minh tan Nguyen Long Giang Bach Surapol Padungthon cong Khiem ta Nhat Huy Nguyen Nanomaterial Laboratory An Giang University18 Ung Van Khiem St.Dong Xuyen DistLong Xuyen CityAn Giang ProvinceViet Nam Vietnam National University Ho Chi Minh City Linh Trung WardThu Duc DistrictHo Chi Minh CityViet Nam Faculty of Natural Resources and Environment Ho Chi Minh City University of Technology(HCMUT)268 Ly Thuong Kiet St.Dist.10Ho Chi Minh CityViet Nam Faculty of Engineering-Technology-Environment An Giang University18 Ung Van Khiem StDong Xuyen DistLong Xuyen CityAn Giang ProvinceViet Nam Department of Scientific Research and International Relation Bac Lieu University178 Vo Thi Sau St.Ward 8Bac Lieu CityBac Lieu ProvinceViet Nam NTT Institute of High Technology Nguyen Tat Thanh University298-300A Nguyen Tat ThanhHo Chi Minh CityViet Nam Department of Environmental Engineering Khon Kaen University123 Moo 16 Mittraphap Rd.Nai-MuangMuang DistrictKhon Kaen 40002Thailand

In this study,we reported on the concept and practical use of cation exchange resin(CER)for removing anions in water via pretreating the CER with metal *** cation exchange resinsupported iron and magnesium oxides/hydroxides composite(FeMg/CER)was synthesized and introduced as a new and potential adsorbent for selective removal of nitrate ion in the water *** of FeMg/CER were determined by techniques such as Fouriertransform infrared spectroscopy,scanning electron microscopy,and Xray *** results showed that FeMg/CER material had a high nitrate adsorption capacity of 200 mg NO_(3)^()·g^(1)with a fast equilibrium adsorption time of 30 min at pH *** addition,it had good durability of at least 10 times of regeneration,which could be applied to practical water and wastewater treatment.

关键词： Iron oxide/hydroxide Magnesium oxide/hydroxide Cation exchange resin Adsorption Environment Nanomaterials