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Circuits and Systems 2024年第1期15卷 1-11页

作者： nguyen quang Tuan Faculty of Information Technology Nha Trang University Khanh Hoa Vietnam

The article synthesizes and presents the results regarding the stability of positive homogeneous systems that have been researched and published in recent years. Next, we provide a sufficient condition for global exponential stability in the case of discrete-time positive homogeneous systems with an order less than one with time-varying delays.

关键词： Exponential Stability Homogeneous Systems Positive Systems Positive Homogeneous Systems

Machine learning based models for predicting compressive strength of geopolymer concrete

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Frontiers of Structural and Civil Engineering 2024年第7期18卷 1028-1049页

作者： quang-Huy LE Duy-Hung nguyen Thanh SANG-TO Samir KHATIR Hoang LE-MINH Amir H.GANDOMI Thanh CUONG-LE Center for Engineering Application and Technology Solutions Ho Chi Minh City Open UniversityHo Chi Minh 700000Vietnam Institute of Civil Engineering Ho Chi Minh City University of TransportHo Chi Minh 700000Vietnam Faculty of Engineering&Information Technology University of Technology SydneyUltimoNSW 2007Australia

Recently,great attention has been paid to geopolymer concrete due to its advantageous mechanical and environmentally friendly *** effort has been made in experimental studies to advance the understanding of geopolymer concrete,in which compressive strength is one of the most important *** facilitate engineering work on the material,an efficient predicting model is *** this study,three machine learning(ML)-based models,namely deep neural network(DNN),K-nearest neighbors(KNN),and support vector machines(SVM),are developed for forecasting the compressive strength of the geopolymer concrete.A total of 375 experimental samples are collected from the literature to build a database for the development of the predicting models.A careful procedure for data preprocessing is implemented,by which outliers are examined and removed from the database and input variables are standardized before feeding to the fitting *** standard K-fold cross-validation approach is applied for evaluating the performance of the models so that overfitting status is well managed,thus the generalizability of the models is *** effectiveness of the models is assessed via statistical metrics including root mean squared error(RMSE),mean absolute error(MAE),correlation coefficient(R),and the recently proposed performance index(PI).The basic mean square error(MSE)is used as the loss function to be minimized during the model fitting *** three ML-based models are successfully developed for estimating the compressive strength,for which good correlations between the predicted and the true values are obtained for DNN,KNN,and *** numerical results suggest that the DNN model generally outperforms the other two models.

关键词： geopolymer concrete compressive strength prediction machine-learning based model deep neural network K-nearest neighbor support vector machines

Assessment of the physicochemical properties and biological activity of Vietnamese single-bulb black garlic

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Food Bioscience 2022年第5期49卷 436-445页

作者： Cao Thi Hue Luc quang Tan Hoang Van Hung Quynh Thi Ngoc Le Thanh Hoa nguyen nguyen Thi Lan Huong nguyen Manh Ha Dinh Kha Trinh Department of Biotechnology Thuyloi University175 Tay SonDong DaHanoiViet Nam Thai nguyen University-Lao Cai Campus Group 13Binh Minh WardLao Cai CityLao Cai ProvinceViet Nam Hanoi University of Industry 298 Cau DienBac Tu LiemHanoiViet Nam

This study assessed the quality and biological activity of Vietnamese single-bulb black garlic(SBG)by investigating the effect of different temperatures(60,65,70,and 75℃)on physicochemical properties during the heat treatment *** optimal treating conditions accounted for the highest concentration of antioxidants were 70℃for 42 *** SBG.70 had a higher content of reducing sugar,protein,flavonoid,and polyphenol in comparison with the white garlic and the *** activity of single-bulb white garlic and SBG were measured via DPPH,phosphomolybdenum,and H2O2 radicals,as well as a reduction *** antimicrobial activity was assessed by the multi-concentration dilution method;the sample treated at 70℃displayed the strongest activity against four microbial strains with MIC values for ***,***,***,and *** of 64,128,128,and 64μg/mL,***,only two SBG samples aged at 70℃and 75℃were bacteriostatic to *** with MIC values of 32 and 64μg/mL,respectively.

关键词： Single-bulb black garlic Different temperature Physicochemical Antioxidant content Antioxidant activity Antimicrobial activity

A New Species of Microhyla(Amphibia:Anura:Microhylidae)from Langbian Plateau,Central Vietnam

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Asian Herpetological Research 2020年第3期11卷 161-182页

作者： Van Chung HOANG Mai Anh LUONG quang Truong nguyen Nikolai L.ORLOV Youhua CHEN Bin WANG Jianping JIANG Chinese Academy of Sciences(CAS)Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization and Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province Chengdu Institute of BiologyCASChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China Vietnam National Museum of Nature Vietnam Academy of Science and Technology18 Hoang Quoc Viet RoadHanoiVietnam Institute of Ecology and Biological Resources Vietnam Academy of Science and Technology18 Hoang Quoc Viet RoadHanoiVietnam Graduate University of Science and Technology Vietnam Academy of Science and Technology18 Hoang Quoc Viet RoadCau GiayHanoiVietnam Zoological Institute Russian Academy of SciencesUniversitetskaya nab 1St.Petersburg 199034Russia

We describe a new species,Microh yla hongiaoensis ***.,from Lam Dong Province,southern Vietnam based on morphological data and molecular *** new species is sister to *** by molecular phylogenetics and also most closely resembles *** in morphological characteristics,albeit differs from its congeners by a combination of the following morphological features:(1)size medium(SVL 13.6-14.7 mm in males and 18.3-18.6 mm in females);(2)fingers Ⅱ-Ⅳ with small disks,dorsal surface of disks,without median longitudinal groove;(3)webbing formula Ⅰ11/2 Ⅱ1-2 Ⅲ1-21/2Ⅳ21/4-1 Ⅴ;(4)toe disks with dorsal median longitudinal groove;(5)dorsal back without two small black spots;(6)one small black spot adjacent behind the eyes;(7)few small black scapular spots in the flanks-belly and inguinal region;(8)palm with two small metatarsal tubercles;(9)tibiotarsal reaching beyond *** *** in evergreen montane tropical forests at an elevation of 1500 m a.s.l.

关键词： new species Microhyla Bi Doup-Nui Ba national

Effect of Meteorological Factors on PM<sub>10</sub>Concentration in Hanoi, Vietnam

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Journal of Geoscience and Environment Protection 2019年第11期7卷 138-150页

作者： nguyen Anh Dung Duong hong Son nguyen The Duc Hanh Doan quang Tri Department of Science and Technology Ministry of Natural Resources and Environment Hanoi Vietnam Water Resources Institute Ministry of Natural Resources and Environment Hanoi Vietnam Faculty of Environment Hanoi University of Natural Resources and Environment Ministry of Natural Resources and Environment Hanoi Vietnam Vietnam Journal of Hydrometeorology Viet Nam Meteorological and Hydrological Administration Hanoi Vietnam

According to the Ministry of Natural Resources and Environment, Hanoi city is currently facing the increased air pollution, especially particulate matter. This study examines the influence of meteorological factors including temperature, humidity and wind speed on PM10 concentration in Hanoi. The data used in this study include 24-h PM10 concentration data, hourly temperature, humidity and wind speed data in 2018 at three automatic air monitoring stations under Vietnam Environment Administration and Hanoi Natural Resources and Environment Department. The SPSS statistical analysis tools are utilized to analyze the correlation between PM10 concentration and meteorological factors through the Spearman (r) correlation coefficient. Additionally, the Independent-Sample T-Test is also employed to assess the difference in PM10 concentration in the period between dry season (from October to March) and wet season (from May to September). The results show that there is a trend of seasonal variation of PM10 concentration. Specifically, PM10 concentration recorded a higher value in winter and lower in summer. Different correlations between air pollutants and meteorological factors were also observed. PM10 concentration was inversely correlated (r 10 concentration during dry and wetseason. This outcome has confirmed the important role of meteorological factors in the formation of air pollution with large variations in different seasons and geological areas.

关键词： Meteorology Temperature Humidity Wind Speed PM10 Air Quality

How knowledge of hepatitis B disease and vaccine influences vaccination practices among parents in Ho Chi Minh City, Vietnam

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Asian Pacific Journal of Tropical Medicine 2021年第3期14卷 122-127页

作者： Giao Huynh Le An Pham Thien Thuan Tran Ngoc Nga Cao Thi Ngoc Han nguyen quang Vinh Bui Faculty of Public Health University of Medicine and Pharmacy at Ho Chi Minh CityVietnam Center for Training of Family Medicine University of Medicine and Pharmacy at Ho Chi Minh CityVietnam Department of Infectious Diseases University of Medicine and Pharmacy at Ho Chi Minh CityVietnam Infection Control Department University Medical Center at Ho Chi Minh CityVietnam Department of Pediatrics University of Medicine and Pharmacy at Ho Chi Minh CityVietnam

Objective:To assess the influences of the knowledge of parents about hepatitis B virus(HBV)infection and the benefit of HBV vaccination on the practice of HBV vaccination among ***:A prospective cross-sectional study recruited parents whose children,aged 12-24 months,received HBV vaccination at Commune Health Centers(CHCs)in Ho Chi Minh City from Feb.2016 to *** were interviewed using a questionnaire that included 11-item binary knowledge questions and checked their children’s vaccination ***:A total of 768 parents had a mean age of(30.8±5.1)*** mean knowledge score of the 11-item questions was(7.0±2.4).The knowledge score was positively associated with full and timely HBV *** addition,children who received complete and timely HBV vaccination were significantly more likely to live in rural areas(Adjusted OR 4.02,95%CI 2.79-5.79,P<0.001).Also,children whose parents received vaccination information from health care providers,and had knowledge about HBV risk,had a higher rate of full and timely HBV vaccination(Adjusted OR 1.60,95%CI 1.13-2.29,and Adjusted OR 1.47,95%CI 1.01-2.13,P all<0.05).Conclusions:Parents possessed a great deal of incorrect knowledge about *** health education from health care providers should target parents living in specific locations and focus on the benefits of HBV vaccine.

关键词： Knowledge Hepatitis Health Belief Model Vaccination Questionnaire

EARLY NEOLITHIC SKULLS IN QUYNH VAN NGHE AN NORTH VIETNAM

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古脊椎动物学报(中英文） 1966年第1期 49-57页

作者： nguyen DUY nguyen quang QUYEN Section of Anthropology Institute of Archaeology Vietnam Section of Anatomy Faculty of Medicine Vietnam

In the beginning of 1964,our archaeologists excavated the old cemetery in Quynh van,and found 30 graves,in which 2 calva were rather well *** calva “Q.V.M.15”was exhumed with a mandible,2 very simple ceramics and 3 flakes,in the *** calva “Q.V.M.17”was exhumed in the grave *** to the Vietnamese Institute of Archaeology it is an ancient cemetery ina kjokkenmoding,in Quynh Van,Ngh

关键词： very than EARLY NEOLITHIC SKULLS IN QUYNH VAN NGHE AN NORTH VIETNAM

An Analytical Approach for Nonlinear Buckling Analysis of Torsionally Loaded Sandwich Carbon Nanotube Reinforced Cylindrical Shells with Auxetic Core

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Advances in Applied Mathematics and Mechanics 2023年第2期15卷 468-484页

作者： Dang Thuy Dong nguyen Thi Phuong Vu Hoai Nam Le Ngoc Ly nguyen Van Tien Vu Minh Duc Tran quang Minh Vu Tho Hung nguyen Thi Huong Giang Faculty of Civil Engineering University of Transport TechnologyHanoi 100000Vietnam Graduate School of Advanced Science and Engineering Hiroshima University1-4-1 KagamiyamaHigashi-HiroshimaHiroshima 739-8527Japan Faculty of Fundamental Science for Engineering University of Transport TechnologyHanoi 100000Vietnam

The main aim of this paper is to present an analytical approach on the postbuckling for torsionally loaded sandwich carbon nanotube(CNT)reinforced cylindrical shells with the auxetic *** considered shells consist of three layers,external and internal CNT reinforced layers,and the auxetic lattice core made by isotropic *** homogenization model for honeycomb auxetic lattice core is utilized,and the equilibrium equations are formulated based on the nonlinear Donnell’s thin shell theory with von Karman geometrical *** three terms of deflection are considered,the Airy’s stress function and Galerkin’s method are utilized,the explicit expression of critical buckling of torsionally loaded shells and load-deflection expression of postbuckling states are *** effects of two carbon nanotube reinforced layers,the auxetic core layer,the volume fraction of carbon nanotube on the torsional buckling behavior are examined and remarked.

关键词： Nonlinear postbuckling carbon nanotube reinforced composite cylindrical shell torsion auxetic core

Pyrolytic carbon resonators for micromechanical thermal analysis

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Microsystems & Nanoengineering 2019年第1期5卷 154-163页

作者： Long quang nguyen Peter Emil Larsen Tom Larsen Sanjukta Bose Goswami Luis Guillermo Villanueva Anja Boisen Stephan Sylvest Keller DNRF and Villum Fonden Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics IDUNTechnical University of Denmark2800 Kgs LyngbyDenmark DTU Nanolab Technical University of Denmark2800 Kgs LyngbyDenmark DTU Health Tech Technical University of Denmark2800 Kgs LyngbyDenmark Advanced NEMS Laboratory Ecole Polytechnique Fédérale de Lausanne1015 LausanneSwitzerland

Thermal analysis is essential for the characterization of polymers and ***,the currently established methods require a large amount of ***,we present pyrolytic carbon resonators as promising tools for micromechanical thermal analysis(MTA)of nanograms of *** clamped pre-stressed beams with a resonance frequency of 233±4 kHz and a quality factor(Q factor)of 800±200 were *** of the electrical conductivity of the pyrolytic carbon allowed us to explore resistive heating for integrated temperature *** was achieved by monitoring the resonance frequency and quality factor of the carbon resonators with and without a deposited sample as a function of *** prove the potential of pyrolytic carbon resonators as thermal analysis tools,the glass transition temperature(T_(g))of semicrystalline poly(L-lactic acid)(PLLA)and the melting temperature(T_(m))of poly(caprolactone)(PCL)were *** results show that the T_(g) of PLLA and T_(m) of PCL are 61.0±0.8℃ and 60.0±1.0℃,respectively,which are in excellent agreement with the values measured by differential scanning calorimetry(DSC).

关键词： temperature carbon thermal

Wedelolactone from Eclipta prostrata(L)*** inflammation and improves insulin resistance

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Asian Pacific Journal of Tropical Biomedicine 2024年第6期14卷 253-258页

作者： Trinh Tat Cuong Duong Duc Thien Hoang Hai Yen nguyen Anh Duc Trinh quang Nam Do Viet Khanh Key Laboratory for Enzyme and Protein Technology Vietnam National University University of ScienceHanoiVietnam Faculty of Biology Vietnam National University University of ScienceHanoiVietnam Hanoi University of Pharmacy HanoiVietnam Vinschool HanoiVietnam

Objective:To evaluate the effects of wedelolactone,a major flavonoid from Vietnamese Eclipta prostrata(L)L.,on inflammation and insulin ***:Wedelolactone was extracted from the leaves of Vietnamese Eclipta prostrata(L.)*** methanol by *** effects of wedelolactone on lipopolysaccharide(LPS)-induced cytokine production,reactive oxygen species(ROS)generation,and nicotinamide adenine dinucleotide phosphate(NADPH)oxidase activities in Raw 264.7 cells were measured by enzyme-linked immunosorbent assay(ELISA),specific immunofluorescent dyes and luminometric analysis,*** addition,its effects on glucose uptake and the protein expression of insulin receptor substrate 1(IRS1)and glucose transporter 4(GLUT4)were examined in 3T3-L1 cells by immunofluorescent dyes and Western ***:Wedelolactone at 30μg/mL significantly inhibited LPS-induced production of tumor necrosis factor-α,interleukin(IL)-6,and IL-8(P<0.01)with no noticeable effects on IL-10 *** also reduced ROS generation and NADPH oxidase activities in LPS-stimulated Raw 264.7 cells(P<0.01).Furthermore,wedelolactone showed anti-insulin resistance activity,as evidenced by improved glucose uptake and the upregulated expression of IRS1 and GLUT4 in 3T3-L1 cells(P<0.01).Conclusions:Wedelolactone exhibits anti-inflammation and anti-insulin resistance effects,which may be used for the treatment of diabetes and inflammation-associated diseases.

关键词： Wedelolactone Eclipta prostrata Inflammatory responses Anti-insulin resistance Diabetes IRS1 GLUT4