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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

A new formula for screening metabolic syndrome in Asians:skin fold thickness at A8 point on Erdheim diagram and waist circumference

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Journal of Geriatric Cardiology 2007年第1期4卷 32-41页

作者： Toan C Nguyen Thai Q Ngo Khoa ta Pham son V Nguyen Hieu T Luong cong D Nguyen Vietnam Military Medical University Ha Dong Town Ha Tay Province Vietnam Department of Cardiology Hospital 103 Vietnam

Background and objectives Recent studies have shown that abdominal obesity is an important component for the diagnosis of metabolic syndrome (MS) and MS is a high risk factor for cardiovascular disease and diabetes mellitus. The aim of this study was to develop a new formula for screening and diagnosis of MS using the waist circumference (WC) and skin fold thickness at the point A8 (SFA8) on the Erdheim diagram. Methods A total of 358 essential hypertensive patients (189 male and 169 female) with a mean age of 59.0±9.7 years were included; 151 healthy people (79 male, 72 female) with a mean age of 57.3±12.1 years (similar to hypertensive patients) who were non-hypertensive and non-diabetic served as a control group. All subjects had no evidence of hepatic, renal, or endocrine disease as determined by history, physical examination and screening blood tests. Height, weight, WC, SFA8, blood pressure (BP), fasting plasma glucose, HDL-cholesterol and triglyceride levels were measured in all subjects. Abdominal obesity measured by WC using the Asia-Pacific criteria (IDFA) was applied for meeting the MS definition. The normal value of SFA8 was measured in the non- MS group. Relationships between SFA8 and systolic BP, diastolic BP, fasting plasma glucose, HDL-cholesterol and triglyceride levels were calculated in the control group. A new formula was developed according to high SFA8 and high WC. Results The normal value of SFA8 in non-MS group was 23.6±7.2 mm in male and 26.5±4.6 mm in female, respectively. The value of SFA8 in MS group was 36.7± 7.4 mm in male and 38.9 ± 8.1 mm in female, respectively. The value of WC in MS group and non-MS group were 92.5±3.0 cm and 79.4±6. 1 cm in male and 86.3±6.4 cm and 74.7±5.4 cm in female, respectively. There was a correlation between SFA8 and systolic BP, diastolic BP, fasting plasma glucose, HDL-cholesterol and triglyceride in control group (the correlation coefficients were 0.29, 0.23, 0.25, -0.31 and 0.46, respectively, P < 0.01)

关键词： waist circumference skin fold thickness metabolic syndrome

Skin fold thickness at abdomen:a simple anthropometric measurement may compliment metabolic syndrome definition in patients with normal waist circumference

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Journal of Geriatric Cardiology 2006年第2期3卷 85-92页

作者： Toan C Nguyen Thai Q Ngo son V Nguyen Hieu T Luong Khoa ta Pham cong D Nguyen Vietnam Military Medical University Ha ToyVietnam

Backgroud and Objectives Previous studies have reported that skin fold thickness (SF) strongly correlated with insulin resistance in the metabolic syndrome (MetS). In this study, we developed a MetS definition by SF at A8 point (SFA8) on Erdheim diagram(MetSSFA8) in essential hypertensive patients. Subjects and Methods Medical records of 268 essential hypertensive patients (126males and 122 females) were analyzed, including 210 non-diabetic patients (NDM group) and 58 patients with diabetes (DM group).The mean age was 61.4 ± 9.9 and 59.0 ± 11.0 years, respectively. The control group consisted of 90 non-diabetic, non-hypertensive patients with a mean age of 58.0 ± 11.3 years. The proposed MetSSFA8 definition included SFA8 specific values ( ≥30 mm in female and ≥27 mm in male) and at least two of the following: raised triglyceride levels ( ≥1.7 mmol/L), or specific treatment for this lipid abnormality; raised blood pressure (SBP≥130 mmHg and/or DBP≥85 mmHg), or treatment of previously diagnosed hypertension;reduced HDL-cholesterol (＜ 1.03 mmol/L in men, ＜1.29 mmol/L in women), or specific treatment for this lipid abnormality; raised fasting plasma glucose (≥5.6 mmol/l), or previously diagnosed DM. Metabolic Syndrome by the National Cholesterol Education Program and International Diabetes Federation definitions were determined with abdominal obesity defined by Asia-Pacific criteria for waist circumference (NCEPA and IDFA). Results The percentage of MetS as defined by NCEPA, IDFA and MetSSFA8 in NDM group was lower than that of NCEPA, IDFA and MetSSFA8 in DM group [OR=7.7 (95%CI, 2.9-20.2) and 2.5 (95%CI, 1.4-4.8) and 2.7(95%CI, 1.3-5.6), respectively] and higher than that of the control group [OR=53.3 (95%CI, 16.7-170.6), 5.8 (95%CI, 2.6-13.2) and18.8 (95%CI, 7.3-48.7), respectively]. The percentage of MetS by NCEPA, IDFA and MetSSFA8 in males in NDM group was lower than the percentage of MetS by NCEPA, IDFA and MetSSFA8 in females in NDM group (50.8% and 77.9%, P＜ 0.0

关键词： skin fold thickness metabolic syndrome hypertension

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

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

以伟大的历史主动推进体育强国建设——习近平总书记发扬历史主动精神引领新时代体育发展的内涵、要素与路径

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哈尔滨体育学院学报 2025年第1期43卷 1-8页

作者：陈丛刊谯聪王思贝西南财经大学体育与经济管理研究中心上海体育大学经济管理学院

党的十八大以来，以习近平同志为核心的党中央以伟大的历史主动、巨大的政治勇气、强烈的责任担当，团结带领全党全国各族人民推动新时代体育发展取得历史性成就、发生历史性变革，形成了丰富而深刻的历史主动思想。这一伟大思想视野宏... 详细信息

党的十八大以来，以习近平同志为核心的党中央以伟大的历史主动、巨大的政治勇气、强烈的责任担当，团结带领全党全国各族人民推动新时代体育发展取得历史性成就、发生历史性变革，形成了丰富而深刻的历史主动思想。这一伟大思想视野宏阔、系统全面、博大精深，为促进体育发展赢得主动、赢得先机、赢得优势提供了根本保障。研究认为，习近平总书记发扬历史主动精神引领新时代体育发展的内涵意蕴包括发挥推动体育发展的主观能动性、赢得体育发展的主动权、争取体育发展的战略主动；要素要求包含体育发展主体需要具备高度的历史自觉、科学的历史思维、坚定的历史定力；实践路径涵盖发挥历史主动必须聚焦体育发展主题、尊重体育发展规律、不断开创体育发展新局，为党在新征程上不断增强中国式现代化体育发展的历史主动，满足人民美好生活的体育需求，加快体育强国建设奠定了坚实基础。

关键词：历史主动体育强国内涵意蕴要素要求实践路径

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

Microstructure of a Ti–50wt% ta alloy produced via laser powder bed fusion

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Acta Metallurgica Sinica(English Letters) 2020年第7期33卷 981-990页

作者： Lei-Lei Xing cong-cong Zhao Hao Chen Zhi-Jian Shen Wei Liu School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Jihua Laboratory 13th FloorChengye buildingNanping West Road No.13GuichengNanhai districtFoshan cityGuangdong province 528000China Arrhenius Laboratory Department of Materials and Environmental ChemistryStockholm University10691StockholmSweden

Ti-ta alloys have been widely studied for biomedical applications due to their high biocompatibility and corrosion *** this work,nearly fully dense and in situ alloyed Ti-50 wt% ta samples were fabricated by the laser powder bed fusion(LPBF) of mechanically mixed *** increased exposure time,and thereby increased laser energy density,insoluble ta particles were almost dissolved,and a Ti-50 wt% ta alloy was *** and dendritic structures were formed due to constitutional undercooling,which was caused by the high cooling rate of LPBF *** retained βphases and α " phases were observed in the LPBFed Ti-50 wt% ta *** α" phase was found at the boundary of the cellular structures,where the tantalum content was not high enough to suppress the bcc lattice transition completely but could suppress the β phase→α’ phase transition.

关键词： alloy Microstructure corrosion