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STRONG CONVERGENCE OF AN INERTIAL EXTRAGRADIENT METHOD WITH AN ADAPTIVE NONDECREASING STEP SIZE FOR SOLVING VARIATIONAL INEQUALITIES

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Acta Mathematica Scientia 2022年第2期42卷 795-812页

作者： nguyen Xuan LINH Duong Viet Thong Prasit CHOLAMJIAK Pham Anh TUAN Luong Van LONG Department of Mathematics Mathematics Falcuty of Information TechnologyNational University of Civil Engineering Division of Applied Mathematics Thu Dau Mot UniversityBinh Duong ProvinceVietnam School of Science University of PhayaoPhayao 56000Thailand Paculty of Mathematical Economics National Economics UniversityHanoi CityVietnam

In this work,we investigate a classical pseudomonotone and Lipschitz continuous variational inequality in the setting of Hilbert space,and present a projection-type approximation method for solving this *** method requires only to compute one projection onto the feasible set per iteration and without any linesearch procedure or additional projections as well as does not need to the prior knowledge of the Lipschitz constant and the sequentially weakly continuity of the variational inequality mapping.A strong convergence is established for the proposed method to a solution of a variational inequality problem under certain mild ***,we give some numerical experiments illustrating the performance of the proposed method for variational inequality problems.

关键词： Inertial method Tseng’s extragradient viscosity method variational inequality problem pseudomonotone mapping strong convergence

Antibiofilm activity of a-mangostin extracted from Garcinia mangostana L. against Staphylococcus aureus

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Asian Pacific Journal of Tropical Medicine 2017年第12期10卷 1154-1160页

作者： nguyen thi Mai Phuong Ngo Van Quang Ta thu Mai nguyen Vu Anh Chutima Kuhakarn Vichai Reutrakul Albert Bolhuis Institute of Biotechnology Vietnam Academy of Science and Technology18 Hoang Quoc Viet RoadHanoiViet Nam Graduate University of Science and Technology Vietnam Academy of Science and Technology18 Hoang Quoc Viet RoadHanoiViet Nam Institute of Chemistry Vietnam Academy of Science and Technology18 Hoang Quoc Viet RoadHanoiViet Nam Center of Excellence for Innovation in Chemistry and Department of Chemistry Faculty of ScienceMahidol UniversityRama 6 RoadBangkok 10400Thailand Department of Pharmacy and Pharmacology University of BathClaverton Down BathBA2 7AYBathUK

Objective: To isolate a-mangostin(AMG) from the peels of mangosteen(Garcinia mangostana L.), grown in Vietnam, and to investigate antibiofilm activity of this compound against three Staphylococcus aureus(S. aureus) strains, one of which was methicillin-resistant S. aureus(MRSA) and the other two strains were methicillinsensitive S. aureus(MSSA).Methods: AMG in n-hexane fraction was isolated on a silica gel column and chemically analyzed by HPLC and NMR. The antibiofilm activity of this compound was investigated by using a 96-well plate model for the formation of biofilms. Biofilm biomass was quantified using crystal violet. The viability of cells was observed under confocal microscopy using LIVE/DEAD Bac Light stains. Biofilm composition was determined using specific chemical and enzyme tests for polysaccharide, protein and DNA. Membranedamaging activity was assayed by measuring the hemolysis of human red blood cells in presence of ***: The results indicated that the isolated AMG, with a purity that exceeded 98%,had minimal inhibitory concentrations in the range of 4.6–9.2 mmol/L for the three strains tested. Interestingly, the MSSA strains were more sensitive to AMG than the MRSA strain. Minimal bactericidal concentrations were 2-fold higher than the minimal inhibitory concentration values for the three strains, indicating that AMG was a bactericidal compound. AMG also prevented biofilm formation effectively, albeit that again the MRSA strain was the most resistant. Interestingly, biofilms of the MRSA strain contained protein as a main component of the extracellular matrix, whereas this was polysaccharide in the MSSA strains. this might relate to the resistance of the MRSA 252 strain to *** using human red blood cells indicated that AMG caused significant membrane damage with 50% of cell lysis occurred at concentration of about 36 mmol/***: Our results provide evidence that the isolated AMG has inhibitory activity against biofilm formation

关键词： α-Mangostin Garcinia mangostana Biofilms Methicillin resistance Staphylococcus aureus

Determination of the Administration Routes,Doses and Appropriate Age to Vaccinate With Ornitin Triple Vaccine For Cross-breed Colored Broilers in Vietnam

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Veterinary Science Research 2019年第2期1卷 1-9页

作者： nguyen Manh Ho Bui Ngoc Xuan Ha Le thi Kim Tuyen Le thi Anh thu Le Thanh Hien Quach Tuyet Anh Faculty of Animal Science and Veterinary Medicine Nong Lam UniversityHo Chi Minh CityVietnam

The study was to determine the appropriate dose and administration route of Ornitin Triple vaccine in cross-breed coloured broilers in Vietnam by evaluating the antibody titer against Ornithobacterium rhinotracheale(ORT)and local reactions at injection sites on chickens after *** study was divided into 2 *** trials were designed with 3 vaccine dose groups:0.0ml(control group),0.25ml and 0.5ml and 2 different administration routes:subcutaneous at neck(SC)and intramuscular at breast(IM)*** result showed that,no statistically significant difference was found between antibody titer of two administration routes as well as 2 vaccine doses until *** reactions at the injection sites of IM route was less severe than SC at neck and in higher dose would produce a more severe swelling *** weight gain was found to have a slight decrease in the vaccinated groups within 2 weeks after vaccination,however,no statistically significant difference was found in later stage(P>0.05).In conclusion,Ornitin Triple can be used to vaccinate by IM with the dose of 0.25ml for coloured broilers at early age(3-week-old),or 0.5ml for older birds and should be careful for some reactions at the injection sites.

关键词： ORT disease swelling reaction titer IDEXX bacteria vaccine

Multi-objective Optimization of a Two-Stage Helical Gearbox to Improve Efficiency and Reduce Height

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Journal of Environmental Science and Engineering(B) 2023年第5期12卷 236-247页

作者： Tran Quoc Hung Truong thi thu Huong Ha Noi University of Industry Bac Tu Liem District 143315Ha Noi cityVietnam Thai nguyen University of Technology Thai Nguyen city 251750Vietnam

The goal of this research is to look at multi-target optimization of a two-stage helical gearbox in order to determine the best key design elements for reducing gearbox height and enhancing gearbox *** do this,the method known as Taguchi and GRA(Grey Relation Analysis)were used in two stages to address the *** single-objective optimization problem was addressed first to close the gap between variable levels,and then the multi-objective optimization problem was solved to determine the best primary design *** first and second stage CWFWs(Coefficients of Wheel Face Width),ACS(Permissible Contact Stresses),and first stage gear ratio were also *** study’s findings were utilized to identify the best values for five critical design aspects of a two-stage helical gearbox.

关键词： Helical gearbox multi-objective optimization gear ratio gearbox height gearbox efficiency.

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甘蔗生物能系统的温室气体减排潜能

广西蔗糖 2011年第3期 46-54页

作者： thu Lan T.nguyen Shabbir H.Gheewala Masayuki Sagisaka 王淋靓奥胡斯大学农业生态系先皇技术学院能源和环境联合研究生院泰国曼谷10140 筑波国立先进工业科学和技术安全与可持续发展科学研究院广西大学轻工与食品工程学院广西南宁530004

与化石能源相比,生物能源系统一个最主要的优势是其温室气体(GHG)排放量较低。通过发电和生产乙醇,把蔗糖厂转变成生物能源厂,可以减缓气候变暖的趋势。本论文基于泰国制糖企业的现状,提出有利于减少温室气体排放量的有效措施:提高利用... 详细信息

与化石能源相比,生物能源系统一个最主要的优势是其温室气体(GHG)排放量较低。通过发电和生产乙醇,把蔗糖厂转变成生物能源厂,可以减缓气候变暖的趋势。本论文基于泰国制糖企业的现状,提出有利于减少温室气体排放量的有效措施:提高利用甘蔗废弃物(如蔗渣和蔗梢)的发电效率;同时在酒精厂将生产酒精后的废液转化成能量,也有利于温室气体的减排;最佳减排方案是用富余的蔗糖生产乙醇,与泰国目前制糖工业相比可大大减少CO2的排放量,每年减少CO2总量可达一千四百万吨。但假定甘蔗种植地来源于草地的转换,即使应用了以上措施,在土地转变过程中产生的碳债务也需要4.5—7年的时间才能被偿还。(碳债务是指由可耕地和森林转变为生产生物燃料而引起的间接排放,比起因生物燃料所得到的利益为负值,所以被形象地称为碳债务)。

关键词：温室气体蔗渣生物能源乙醇再生电能趋势

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东亚价值与东亚共同体建立的构想

东南亚纵横 2010年第2期 81-84页

作者：阮氏秋芳越南社会科学院中国研究所

最近几年,在经济全球化背景下就东亚问题进行研究所得到的结论是在东亚地区存在一种共同的价值。东亚是否存在一种价值?"东亚价值"是什么?"东亚价值"对当今世界面临的一系列问题和东亚共同体建设发挥了什么样的作用?这些正是笔者关心和... 详细信息

最近几年,在经济全球化背景下就东亚问题进行研究所得到的结论是在东亚地区存在一种共同的价值。东亚是否存在一种价值?"东亚价值"是什么?"东亚价值"对当今世界面临的一系列问题和东亚共同体建设发挥了什么样的作用?这些正是笔者关心和探讨的问题。

关键词：东亚价值东亚共同体构想

Fuzzy Feedback Control for Electro-Hydraulic Actuators

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Intelligent Automation & Soft Computing 2023年第5期36卷 2441-2456页

作者： Tan nguyen Van Huy Q.Tran Vinh Xuan Ha Cheolkeun Ha Phu Huynh Minh School of Engineering-Technology Thu Dau Mot UniversityThu Dau Mot City590000Vietnam Faculty of Engineering-Technology Nguyen Tat Thanh UniversityHo Chi Minh City754000Vietnam Hue Industrial College Hue City530000Vietnam Robotics and Mechatronics Lab University of UlsanUlsan City44610Korea

Electro-hydraulic actuators(EHA)have recently played a signiﬁcant role in modern industrial applications,especially in systems requiring extremely high *** can be explained by EHA’s ability to precisely control the position and force through advanced sensors and innovative control *** of the promising approaches to improve control accuracy for EHA systems is applying classical to modern control algorithms,in which the proportional–inte-gral–derivative(PID)algorithm,fuzzy logic controller,and a hybrid of these methods are popular *** this paper,we developed a novel version of the fuzzy control algorithm and linear feedback control method,namely fuzzy lin-ear feedback control,to improve the control *** achieve the highest performance,weﬁrst designed a mathematical EHA model based on the Matlab/Simulink software packages thanks to the selected parameters,which are similar to a real EHA ***,we respectively applied PID,fuzzy PID(FPID),and fuzzy linear feedback control(FLFC)before comparing them to have a full view of the outstanding advantages of the proposed *** simulation results showed that the proposed FLFC algorithm is approximately 99%and 77%super-ior in performance to the PID and feedback control algorithms,respectively.

关键词： Electro-hydraulic actuator fuzzy PID feedback control

A Study on the Selection of the Logistics Centre Location—Vietnam-Based Logistics Sector

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Management Studies 2020年第2期8卷 121-127页

作者： JSC Sai Gon Hiep Phuoc Port Ho Chi Minh City Viet Nam Ho thi thu Hoa nguyen Van Khoang Bui thi Bich Lien Tran Quang Dao To thi Hang Le Van Thanh To thi Hang Ho Chi Minh City University of Transport Ho Chi Minh CityViet Nam JSC Sai Gon Hiep Phuoc Port Ho Chi Minh CityViet Nam

Logistics can be considered as the major drive of the *** centres play a significant role in the entire logistics networks from the point of materials sourcing to the point of last mile *** efficiency of a logistics network depends on the existence of logistics centres to connect and integrate entire logistics *** article discusses the importance of selection of the logistics centre location and recommends the procedure to specify the appropriate logistics centre location as a case of Vietnam-based logistics sector.

关键词： logistics centre Vietnam Ho Chi Minh City location

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夏黑葡萄在越南北部栽培表现及其技术要点

南方园艺 2019年第6期30卷 34-37页

作者：黄江流 DO THANH TRUNG 唐其展吕荣华 nguyen TUAN DIEP CAN VAN TOAN nguyen CONG THANH PHUNG DUY HIEU BUI thi thu TRANG 黄竟刘淑仪黄芳颖梁芳黄勇策黄克顺广西农业科学院葡萄与葡萄酒研究所广西南宁530007 越南北江农林科技大学越南广西农业科学院国际合作处广西南宁530007 广西无为谷生态农业科技有限公司广西南宁530008

河内、北江等越南北方地区年均温比广西南宁高2℃左右,光温条件比较优越,应越方要求新引入种植比巨峰葡萄早熟优质的无核夏黑葡萄,以期调节产期,满足市场需求。采用广西夏黑葡萄当年种当年收和一年两收栽培技术管理,在越南北部地区于3... 详细信息

河内、北江等越南北方地区年均温比广西南宁高2℃左右,光温条件比较优越,应越方要求新引入种植比巨峰葡萄早熟优质的无核夏黑葡萄,以期调节产期,满足市场需求。采用广西夏黑葡萄当年种当年收和一年两收栽培技术管理,在越南北部地区于3月上旬种植夏黑葡萄,种后4个半月于7月下旬修剪促花,剪后1个月于8月下旬开花,剪后2个月于9日下旬着色,剪后3个月于10月中下旬成熟上市,从种到收获全程9个月,平均每hm^2产量8517.0 kg,实现了当年种植当年投产的目标。为越南葡萄产业增加新的经济增长点。

关键词：夏黑葡萄当年种当年投产栽培表现技术要点