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Tungsten-based nanocatalysts with different structures for visible light responsive photocatalytic degradation of bisphenol A

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Journal of Environmental Sciences 2024年第5期139卷 569-588页

作者： Hai Bang Truong Thi thu Loan Doan Nguyen Tien Hoang Nguyen Van Tam Minh Kim Nguyen Le Gia Trung Jin Seog Gwag Nguyen Tien Tran Optical Materials Research Group Science and Technology Advanced InstituteVan Lang UniversityHo Chi Minh CityViet Nam Faculty of Applied Technology School of TechnologyVan Lang UniversityHo Chi Minh CityViet Nam The University of Da Nang University of Science and Technology54 Nguyen Luong BangDa NangViet Nam The University of Da Nang University of Science and Education459 Ton Duc Thang St.Lien ChieuDa Nang 550000Viet Nam Institute of Veterinary Science and Technology 31ha zoneTrau QuyGia LamHa Noi 12400Viet Nam Department of Physics Yeungnam UniversityGyeongsanGyeongbuk 38541Republic of Korea Center for Advanced Chemistry Institute of Research and DevelopmentDuy Tan University03 Quang TrungDa Nang 550000Viet Nam Faculty of Natural Sciences Duy Tan University03 Quang TrungDa Nang 550000Viet Nam

Environmental pollution,such as water contamination,is a critical issue that must be absolutely ***,three different morphologies of tungsten-based photocatalysts(WO_(3)nanorods,WO_(3)/WS_(2)nanobricks,WO_(3)/WS_(2)nanorods)are made using a simple hydrothermal method by changing the solvents(H_(2)O,DMF,aqueous HCl solution).The as-prepared nanocatalysts have excellent thermal stability,large porosity,and high *** results show all materials have good photocatalytic activity in aqueous media,with WO_(3)/WS_(2)nanorods(NRs)having the best activity in the photodegradation of bisphenol A(BPA)under visible-light *** may originate from increased migration of charge carriers and effective prevention of electron–hole recombination in WO_(3)/WS_(2)NRs,whereby this photocatalyst is able to generate more reactive·OH and·O_(2)^(–)species,leading to greater photocatalytic *** 99.6% of BPA is photodegraded within 60 min when using 1.5 g/L WO_(3)/WS_(2)NRs and 5.0 mg/L BPA at pH ***,the optimal conditions(pH,catalyst dosage,initial BPA concentration)for WO_(3)/WS_(2)NRs are also elaborately *** rod-like heterostructures are expressed as potential catalysts with excellent photostability,efficient reusability,and highly active effectivity in different types of *** particular,the removal efficiency of BPA by WO_(3)/WS_(2)NRs reduces by only 1.5% after five recycling runs and even reaches 89.1%in contaminated lake *** study provides promising insights for the nearly complete removal of BPA from wastewater or different water resources,which is advantageous to various applications in environmental remediation.

关键词： Photodegradation Bisphenol A Tungsten-based nanocatalyst Structure Nanorod

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“2023年壮学与布洛陀文化论坛”综述

文山学院学报 2024年第1期37卷 26-29页

作者：韦飞欧裴秋滦广西民族大学民族学与社会学学院广西南宁530006

“2023年壮学与布洛陀文化论坛”通过比较布洛陀文化与壮侗语民族的信仰,揭示了布洛陀信仰蕴含的多民族历史文化内涵;研讨“文化+旅游”、数字化保护等模式,促进布洛陀文化的创新传承;最后,从壮族、布依族、水族等相关民族的布洛陀信仰... 详细信息

“2023年壮学与布洛陀文化论坛”通过比较布洛陀文化与壮侗语民族的信仰,揭示了布洛陀信仰蕴含的多民族历史文化内涵;研讨“文化+旅游”、数字化保护等模式,促进布洛陀文化的创新传承;最后,从壮族、布依族、水族等相关民族的布洛陀信仰共性出发,深入分析布洛陀文化信仰形成与民族交往交流交融的历史联系,呼吁增强中华民族共同体视域下的布洛陀文化和壮学研究。未来的研究在于加强布洛陀信仰个案研究、关注共同体的研究和更多地对现实的研究。

关键词：布洛陀文化壮学壮侗语民族中华民族共同体文化旅游

Atomistic simulation of free transverse vibration of graphene,hexagonal SiC, and BN nanosheets

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Acta Mechanica Sinica 2017年第1期33卷 132-147页

作者： Danh-Truong Nguyen Minh-Quy Le Thanh-lam bui Hai-Le bui School of Mechanical Engineering Hanoi University of Science and Technology Hanoi 10000 Vietnam International Institute for Computational Science and Engineering Hanoi University of Science and TechnologyHanoi 10000 Vietnam Faculty of Mechanical Engineering Hanoi University of Industry Hanoi 10000 Vietnam

Free transverse vibration of monolayer graphene, boron nitride (BN), and silicon carbide (SiC) sheets is investigated by using molecular dynamics finite element method. Eigenfrequencies and eigenmodes of these three sheets in rectangular shape are studied with different aspect ratios with respect to various boundary conditions. It is found that aspect ratios and boundary conditions affect in a similar way on natural frequencies of graphene, BN, and SiC sheets. Natural frequencies in all modes decrease with an increase of the sheet’s size. Graphene exhibits the highest natural frequencies, and SiC sheet possesses the lowest ones. Missing atoms have minor effects on natural frequencies in this study.

关键词： Atomistic simulation Hexagonal sheet Transverse vibration Molecular dynamics finite element method

Anticancer effects of saponin and saponin–phospholipid complex of Panax notoginseng grown in Vietnam

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Asian Pacific Journal of Tropical Biomedicine 2016年第9期6卷 795-800页

作者： thu Dang Kim Hai Nguyen Thanh Duong Nguyen thuy Loi Vu Duc thu Vu Thi Hung Vu Manh Patcharee Boonsiri Tung bui Thanh Department of Pharmacology and Clinical Pharmacy School of Medicine and PharmacyVietnam National University Department of Pharmaceutics and Pharmaceutical Technology School of Medicine and PharmacyVietnam National University Department of Pharmacology Hanoi University of Pharmacy Department of Pharmacognosy and Traditional Pharmacy School of Medicine and PharmacyVietnam National University Faculty of Biology VNU University of Science Key Laboratory of Enzyme and Protein Technology VNU University of Science Department of Pharmacology School of PharmacyLac Hong University Department of Biochemistry Faculty of MedicineKhon Kaen University

Objective:To evaluate the antitumor activity both in vitro and in vivo of saponin–phospholipid complex of Panax ***:The in vitro cytotoxic effect of saponins extract and saponin–phospholipid complex against human lung cancer NCI-H460 and breast cancer cell lines BT474 was examined using MTS *** in vivo evaluation of antitumor potential,saponin and saponin–phospholipid complex were administered orally in rats induced mammary carcinogenesis by 7,12-dimethylbenz(a)anthracene,for 30 ***:Our data showed that saponin–phospholipid complex had stronger anticancer effect compared to saponin *** IC50 values of saponin–phospholipid complex and saponin extract for NCI-H460 cell lines were 28.47 mg/m L and 47.97 mg/mL,respectively and these values for BT474 cells were 53.18 mg/mL and 86.24 mg/mL,*** vivo experiments,administration of saponin,saponin–phospholipid complex and paclitaxel(positive control) effectively suppressed 7,12-dimethylbenz(a) anthracene-induced breast cancer evidenced by a decrease in tumor volume,the reduction of lipid peroxidation level and increase in the body weight,and elevated the enzymatic antioxidant activities of superoxide dismutase,catalase,glutathione peroxidase in rat breast ***:Our study suggests that saponin extract from Panax notoginseng and saponin–phospholipid complex have potential to prevent cancer,especially breast cancer.

关键词： Panax notoginseng Saponin Saponin–phospholipid complex Breast cancer Antitumor

Development and Application of a Distributed Conceptual Hydrological Model to Simulate Runoff in the Be River Basin and the Water Transfer Capacity to the Saigon River Basin,Vietnam

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Journal of Environmental Science and Engineering(A) 2020年第1期9卷 1-12页

作者： Vu Van Nghi Ha bui Nguyen lam Tai Pham Anh Can thu Van Institute for Computational Science and Technology Ho Chi Minh City 700000Vietnam University of Science Vietnam National UniversityHo Chi Minh City 700000Vietnam Dalat University Lam Dong Province 66000Vietnam Institute for Science and Technology Innovation Ho Chi Minh City 700000Vietnam Ho Chi Minh City University of Natural Resources and Environment Ho Chi Minh City 700000Vietnam

A distributed conceptual model(FRASC(Flow Routed Accumulation Simulation in a Catchment))has been developed,in which a rainfall-runoff module is modified from an original lumped conceptual model(Xinanjiang)via a GIS(Geographic Information System)-aided approach and a water allocation module contains reservoirs,water users and hydropower *** model is relatively easy to use and can easily obtain input data,but still has the ability to generate hydrological information at many points within a *** model application to the Be River basin is evaluated and shows to be reliable in terms of close agreements between simulated and observed *** natural flow rates for 36 years are simulated at 7,981 grid cells within a studied area of 7,650 km^*** on this simulated database,design discharges are predicted in various ***,the research determines that the water transfer capacity from the Be River basin to the Saigon River basin reaches 14%,18% and 23% of a planned value of 75 m^3/s during the dry period in a wet year(P10%),average year(P50%)and dry year(P90%),respectively.

关键词： Be River basin distributed conceptual hydrological model FRASC

限定固有频率约束下基于全面学习和相量粒子群的结构优化

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Acta Mechanica Sinica 2023年第4期39卷 44-56页

作者： Ei Cho Pyone Sawekchai Tangaramvong thu Huynh Van Linh Van Hong bui 高伟 Center of Excellence in Applied Mechanics and Structures Department of Civil Engineering Chulalongkorn University Bangkok 10330 Thailand Division of Computational Mathematics and Engineering Institute for Computational Science Ton Duc Thang University Ho Chi Minh City Viet Nam Centre of Infrastructure Engineering and Safety School of Civil and Environmental Engineer The University of New South Wales Sydney NSW 2000 Australia

本文提出了全面学习和相量粒子群相结合的方法用于解决限定固有频率约束下的空间结构优化问题.通过将相量理论和全面学习策略相结合以提高粒子群算法的效率.在优化的过程中,一个所谓的相角采用了周期正弦和余弦函数给定义速度的关键参... 详细信息

本文提出了全面学习和相量粒子群相结合的方法用于解决限定固有频率约束下的空间结构优化问题.通过将相量理论和全面学习策略相结合以提高粒子群算法的效率.在优化的过程中,一个所谓的相角采用了周期正弦和余弦函数给定义速度的关键参数建模使得速度可以从所有粒子前一步的最佳位置中选取.这个方法不但实现了粒子们可以快速学习并且在少量的计算中进行了在作用力和固有频率约束下结构杆件的安全性评估和优化尺寸分布.提出的优化设计方法成功解决了一些工程应用结构的基准设计问题,这证明了本文方法相对于最新元启发方法的准确性和稳定性.

关键词：余弦函数固有频率最佳位置粒子群算法安全性评估空间结构优化相量参数建模

微弧氧化及封孔处理对AlSi12Cu铝合金性能的影响

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微弧氧化及封孔处理对AlSi12Cu铝合金性能的影响

作者： bui DUC thu 南京理工大学

学位级别：硕士

AlSi12Cu合金属于铸造铝合金系列,具有低密度、良好的加工性能、一定的强度和耐蚀性等特点,广泛应用于汽车、航空航天、海洋运输及家用工具等领域。但其硬度低,耐磨性差。在一些介质中AlSi12Cu合金的耐腐蚀性也不能满足要求,从而限制了... 详细信息

AlSi12Cu合金属于铸造铝合金系列,具有低密度、良好的加工性能、一定的强度和耐蚀性等特点,广泛应用于汽车、航空航天、海洋运输及家用工具等领域。但其硬度低,耐磨性差。在一些介质中AlSi12Cu合金的耐腐蚀性也不能满足要求,从而限制了其应用范围。为了提高AlSi12Cu合金的耐磨和耐蚀性能,本文采用微弧氧化(Micro-arc oxidation,MAO)技术在其表面制备氧化铝涂层,利用正交实验设计方法对微弧氧化工艺的电流密度、氧化时间和频率三个参数进行优化研究,采用扫描电子显微镜(SEM)及其附带的能谱仪(EDS)、X射线衍射(XRD)仪分别对膜层的表面形貌、元素含量和物相组成进行分析,并对膜层的耐蚀性和耐磨性能进行了分析评价。为了进一步提高膜层的耐腐蚀性能,对微弧氧化后的试样进行封孔处理,研究了封孔处理方法对其耐蚀性能性能的影响。通过系统研究,得到了如下的主要结果:通过正交实验确定了微弧氧化处理的最佳工艺条件:电流密度为30 A/dm2,电源频率为600 Hz以及氧化时间为20 min。在最佳工艺参数条件下进行微弧氧化获得的膜层厚度为15μm左右,主要由α-Al2O3、γ-Al203、θ-Al2O3和A1组成,膜层与铝合金基体之间结合牢固。AlSi12Cu合金经微弧氧化处理后,耐磨性明显提高,摩擦系数由铝合金基体的0.64减小为0.37;经微弧氧化的铝合金材料在盐雾腐蚀240小时后,还未出现表面腐蚀现象,而在洗衣粉溶液中的腐蚀速率则较铝合金基体降低了 25倍,说明微弧氧化处理使AlSi12Cu合金得耐腐蚀性能也得到了显著改善。利用硅酸钠和硬脂酸封孔剂对微弧氧化膜层进行封孔处理。结果表明,两种封孔方法都能有效将微弧氧化膜层上的微孔及一定数量的大孔封堵,并使膜层的耐蚀性进一步提高。其中,用硬脂酸进行封孔处理效果更好。在3.5%NaCl溶液中的电化学腐蚀实验结果表明,微弧氧化铝合金经硬脂酸封孔处理后,腐蚀电流密度较铝合金基体降低了100倍,腐蚀电位正移了 285 mV。

关键词： AlSi12Cu合金微弧氧化正交实验封孔处理耐蚀性能耐磨性能

Comparison of Layer-stacking and Dempster-Shafer Theory-based Methods Using Sentinel-1 and Sentinel-2 Data Fusion in Urban Land Cover Mapping

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Geo-Spatial Information Science 2022年第3期25卷 425-438页

作者： Dang Hung bui LászlóMucsi Department of Geoinformatics Physical and Environmental GeographyUniversity of SzegedSzegedHungary Institute for Environmental Science Engineering and ManagementIndustrial University of Ho Chi Minh CityHo Chi Minh CityVietnam

Data fusion has shown potential to improve the accuracy of land cover mapping,and selection of the optimal fusion technique remains a *** study investigated the performance of fusing Sentinel-1(S-1)and Sentinel-2(S-2)data,using layer-stacking method at the pixel level and Dempster-Shafer(D-S)theory-based approach at the decision level,for mapping six land cover classes in thu Dau Mot City,*** the pixel level,S-1 and S-2 bands and their extracted textures and indices were stacked into the different single-sensor and multi-sensor datasets(*** datasets).The datasets were categorized into two *** group included the datasets containing only spectral and backscattering bands,and the other group included the datasets consisting of these bands and their extracted *** random forest(RF)classifier was then applied to the datasets within each *** the decision level,the RF classification outputs of the single-sensor datasets within each group were fused together based on D-S ***,the accuracy of the mapping results at both levels within each group was *** results showed that fusion at the decision level provided the best mapping accuracy compared to the results from other products within each *** highest overall accuracy(OA)and Kappa coefficient of the map using D-S theory were 92.67%and 0.91,*** decision-level fusion helped increase the OA of the map by 0.75%to 2.07%compared to that of corresponding S-2 products in the ***,the data fusion at the pixel level delivered the mapping results,which yielded an OA of 4.88%to 6.58%lower than that of corresponding S-2 products in the groups.

关键词： Land cover mapping data fusion random forest Dempster-Shafer theory optical data radar data pixel level decision level

Electrochemical Immunosensor for Detection of Atrazine Based on Polyaniline/Graphene

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Journal of Materials Science & Technology 2016年第6期32卷 539-544页

作者： Nguyen Van Chu Nguyen Hai Binh Cao Thi Thanh Nguyen Van Tu Nguyen Le Huy Nguyen Tuan Dzung Phan Ngoc Minh Vu Thi thu Tran Dai lam Institute of Materials Science Vietnam Academy of Science and Technology18 Hoang Quoc VietCau Giay.HanoiViet Nam School of Chemical Engineering.Hanoi University of Science and Technology 1 Dai Co VietHanoiViet Ham Institute for Tropical Technology.Vietnam Academy of Science and Technology 18 Hoang Quoc VietHanoiViet Nam Center for High Technology Development Vietnam Academy of Science and Technology18 Hoang Quoc VietHanoiViet Nam University of Science and Technology of Hanoi.18 Hoang Quoc Viet HanoiViet Ham Graduate University of Science and Technology.Vietnam Academy of Science and Technology 18 Hoang Quoc Viet.HanoiViet Nam

In this study, a novel layer-by-layer polyaniline/graphene （PANi/Gr） structure for electrochemical detec- tion of atrazine was developed. Gr film was synthesized by thermal chemical vapor deposition （CVD） method and transferred onto the PANi-predeposited microelectrode. The properties of PANi/Gr film were thoroughly investigated by high-resolution transmission electron microscopy and Raman techniques. The most attractive feature of this system is a suitable microenvironment, which could provide an amplifi- cation of the conductive signal, thus may contribute to enhancing electron transfer and subsequently improve the sensitivity in electrochemical measurements. With low detection limit （- 43 × 10 -12 g/L）, ac-ceptable stability and good reproducibility, the proposed electrochemical immunosensor could be advantageously extended for multiplexed detection of other agents of environmental pollution.

关键词： Electrochemical immunosensor Polyaniline Graphene Atrazine