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Green synthesis of three-dimensional magnesium ferrite/titanium dioxide/reduced graphene from Garcinia mangostana extract for crystal violet photodegradation and antibacterial activity

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Journal of Semiconductors 2023年第12期44卷 111-124页

作者： Tong Hoang Lin Che Quang Cong Nguyen Thanh Hoai Nam Hoang An Nguyen Duy Hai Ton That Buu Thoi le Nhat Binh Hoang le Minh Lam Thanh Ngan Hoang Thuy Kim Ngan Du Chi Vi Ta dang khoa Nguyen Huu Hieu VNU-HCM Key Laboratory of Chemical Engineering and Petroleum Processing(Key CEPP Lab)Ho Chi Minh City University of Technology(HCMUT)268 Ly Thuong Kiet StreetDistrict 10Ho Chi Minh CityVietnam Faculty of Chemical Engineering Ho Chi Minh City University of Technology(HCMUT)268 Ly Thuong Kiet StreetDistrict 10Ho Chi Minh CityVietnam Vietnam National University Ho Chi Minh City(VNU-HCM) Linh Trung WardThu Duc CityVietnam

In this study,three-dimensional porous magnesium ferrite/titanium dioxide/reduced graphene oxide(Mg Fe_2O_(4)-GM/TiO_(2)/rGO(MGTG))was successfully synthesized via green and hydrothermal-supported co-precipitation methods using the extract of Garcinia mangostana(***)as a reducing *** characterization results indicate the successful formation of the nano/micro Mg Fe_(2)O_(4)(MFO)and TiO_(2) on the structure of the reduced graphene oxide(rGO),which can also act as efficient support,alleviating the agglomeration of the nano/micro MFO and TiO_(2).The synergic effects of the adsorption and photodegradation activity of the material were investigated according to the removal of crystal violet(CV)under ultraviolet *** effects of catalyst dosage,CV concentration,and p H on the CV removal efficiency of the MGTG were also *** to the results,the CV photodegradation of the MGTG-200 corresponded to the pseudo-first-order kinetic *** reusability of the material after 10 cycles also showed a removal efficiency of 92%.This happened because the materials can easily be recollected using external *** addition,according to the effects of different free radicals·O_(2)^(-),h^(+),and·OH on the photodegradation process,the photocatalysis mechanism of the MGTG was also thoroughly *** antibacterial efficiency of the MGTG was also evaluated according to the inhibition of the Gram-positive bacteria strain Staphylococcus aureus(***).Concurrently,the antibacterial mechanism of the fabricated material was also *** results confirm that the prepared material can be potentially employed in a wide range of applications,including wastewater treatment and antibacterial activity.

关键词： magnesium ferrite titanium dioxide reduced graphene oxide Garcinia mangostana photodegradation antibacterial

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电极配置及参数对多孔电极电除尘器电场与除尘性能影响研究

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环境工程 2024年第3期42卷 122-130页

作者：刘明坤党小庆谢东明乐文毅冯晓峰郑华春李世杰汪志建西安建筑科技大学环境与市政工程学院陕西省环境工程重点实验室西安710055 中冶长天国际工程有限责任公司长沙410205

工业电除尘器受反电晕、微细颗粒捕集效率低等因素影响使超低排放运行过程不稳定,故采用开孔式收尘极板并优化极配形式与参数以减缓上述问题发生,并保证电除尘器高效稳定运行。通过COMSOL Multiphysics模拟试验研究了不同同极间距、线... 详细信息

工业电除尘器受反电晕、微细颗粒捕集效率低等因素影响使超低排放运行过程不稳定,故采用开孔式收尘极板并优化极配形式与参数以减缓上述问题发生,并保证电除尘器高效稳定运行。通过COMSOL Multiphysics模拟试验研究了不同同极间距、线距、板形、线形对电场与除尘性能的影响。结果表明:500 mm同极间距利于高比电阻粉尘捕集。最佳线距处于同极间距的0.5~1倍范围内,此时板表面平均电流密度最大。4种多孔板结构对反电晕现象均有一定的减缓作用,错孔板结构收尘场强最大,除尘性能最优;空腔内增加极板对0.01~0.1μm微细颗粒物捕集效率提升16%。4种线形中,新型鱼骨线除尘性能优于其他线形,采用错孔式收尘极板与新型鱼骨线相配时,除尘区域内收尘场强最佳,颗粒物理论有效驱进速度较其他极配形式提升47%,减少了电除尘器的投资成本和运行费用。该研究结果可为多孔电极电除尘器在超低排放设计应用中提供参考。

关键词：多孔电极电除尘器电极配置电场强度除尘性能数值模拟

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Stochastic Analysis of Short-Term Structural Responses and Fatigue Damages of A Submerged Tension leg Platform Wind Turbine in Wind and Waves

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China Ocean Engineering 2021年第4期35卷 566-577页

作者： HAN Yan-qing le Cong-huan ZHANG Pu-yang dang Li FAN Qing-lai School of Civil Engineering Ludong UniversityYantai 264025China State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China Institution of Cross-sea Engineering Ludong UniversityYantai 264025China

In connection with the design of floating wind turbines,stochastic dynamic analysis is a critical task considering nonlinear wind and wave *** study the random structural responses of a newly designed submerged tension leg platform(STLP)wind turbine,a set of dynamic simulations and comparison analysis with the MIT/NREL TLP wind turbine are carried *** signal filter method is used to evaluate the mean and standard deviations of the structural ***,the extreme responses are estimated by using the mean upcrossing rate *** fatigue damages for blade root,tower,and mooring line are also studied according to the simulated *** results and comparison analysis show that the STLP gives small surge and pitch motions and mooring line tensions in operational sea states due to the small water-plane ***,in severe sea states,the STLP gives lower extreme values of platform pitch,slightly larger surge and heave motions and better towerbase and mooring line fatigue performances than those of the MIT/NREL *** is found that the STLP wind turbine has good performances in structural responses and could be a potential type for exploiting the wind resources located in deep waters.

关键词： stochastic analysis signal filter mean upcrossing rate fatigue damage equivalent load

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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

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Suzuki Reaction of Aryl Bromides Using a Phosphine-Free Magnetic Nanoparticle-Supported Palladium Catalyst

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催化学报 2011年第11期32卷 1667-1676页

作者： Nghia T. BUI Trung B. dang Ha V. le Nam T. S. PHAN Department of Chemical Engineering HCMC University of Technology VNU-HCM 268 Ly Thuong Kiet Distriet 10 Ho Chi Minh City Viet Nam

A palladium catalyst immobilized on superparaganetic nanoparticles was prepared with a palladium loading of 0.30 mmol/g. The catalyst was characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, vibrating sample magnetometry, thermogravimetric analysis, Fourier transform infrared, atomic absorption spectrophotometry, and nitrogen adsorption. The immobilized palladium catalyst was an efficient catalyst without added phosphine ligands for the Suzuki cross-coupling reaction of several aryl bromides with phenylboronic acid. The recovery of catalyst was simply by magnetic decantation in the presence of a magnet. The immobilized palladium catalyst can be reused many times without significant degradation in catalytic activity. No leaching of active palladium species into the reaction solution was detected.

关键词： superparamagnetic nanoparticle Suzuki reaction palladium aryl bromide

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Blockade of complement activation in bullous pemphigoid by using recombinant CD55-CD46 fusion protein

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Chinese Medical Journal 2021年第7期134卷 864-866页

作者： Pei Qiao Yi-Xin Luo Da-Long Zhi Gang Wang Er-le dang Department of Dermatology Xijing HospitalFourth Military Medical UniversityXi'anShaanxi 710032China

To the Editor:Bullous pemphigoid(BP)is an autoimmune blistering disease that is caused by autoantibodies and is associated with complement activation.[1]Autoantibody-mediated complement activation is involved in BP ***-regulatory proteins(CRPs)including CD35,CD46,CD55,and CD59 comprise an important class of regulatory proteins in the complement system that control the enzyme cascades,assembly of the membrane-attack complex,and complement system homeostasis.[2]Classically,both CD55 and CD46 negatively regulate complement system activation by inhibiting the production of new C3 and C5 convertases and accelerating the degradation of those already formed,thereby protecting cells from complement activation-induced damage.

关键词： CD55 CD46 damage

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Effect of noncovalent complexations on coordination interactions in a tricomponent system ofβ-cyclodextrin,copper chloride and hexamethylene tetramine

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Chinese Chemical letters 2011年第11期22卷 1347-1350页

作者： Jing Yang le Xin Song Zheng dang Shu Zhen Pan Fang Yun Du Department of Chemistry University of Science and Technology of China Hefei 230026 China State Key Laboratory of Coordination Chemistry Nanjing University Nanjing 210093 China

This study reveals that the noncovalent complexation betweenβ-CD and Cu（HMTA）^（2＋） makes a positive contribution to the coordination interaction between Cu^（2＋） and HMTA in a tricomponent ***,mono- and binucl... 详细信息

关键词： Noncovalent complexation Coordination interaction β-Cyclodextrin Copper chloride

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Progress in development of electrocatalyst for CO2 conversion to selective CO2 production

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Carbon Energy 2020年第1期2卷 72-98页

作者： dang le Tri Nguyen Younghye Kim Yun Jeong Hwang Da Hye Won Clean Energy Research Center Korea Institute of Science and TechnologySeoulRepublic of Korea Division of Energy and Environmental Technology KIST SchoolKorea University of Science and TechnologySeoulRepublic of Korea Department of Chemical and Biomolecular Engineering Yonsei UniversitySeoulRepublic of Korea

The conversion of carbon dioxide(CO2)to valuable fuels and chemicals offers a new pathway for sustainable and clean carbon ***,the focus has been on electrochemical CO2 reduction on heterogeneous electrode catalysts,leading to remarkable achievements in the reaction *** date,CO2 to carbon monoxide(CO)conversion is considered as the most promising candidate reaction for the industrial market,owing to its high efficiency and reasonable technoeconomic ***,CO has been proposed as a key intermediate species for further reduced hydrocarbons,which can pave the way for various fuel *** study sets out to describe recent progress on the electrochemical CO2 reduction to CO in a heterogeneously catalyzed *** review includes understanding of the catalytic material employed and engineering strategies implemented by adjusting the binding energy of key *** material design approaches,such as nanostructuring,alloying,doping,and so forth,have pioneered breakouts in the intrinsic catalytic nature of transition metal ***,recent advances in systematic design are summarized,with focus on practical industrial ***,perspectives on the design of electrocatalyst materials for CO production by electrochemical CO2 reduction are presented.

关键词： CO production CO2 reduction reaction electrocatalyst

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永久式光纤监测技术在海上首口二氧化碳回注井的应用

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石化技术 2024年第1期31卷 68-70,61页

作者：邓成辉曹波波党黎锋宣涛张玺亮中海石油(中国)有限公司深圳分公司深圳518067 中海油能源发展股份有限公司天津300452

近期南海东部海域恩平油田我国海上首口二氧化碳回注井正式投产,采油分离出来的二氧化碳气体被烘干压缩后回注至储层进行封存。为确保注入期间的安全性需要实时掌握注入参数判断井下情况,采用永久式分布式光纤监测技术,实现了全井筒温... 详细信息

近期南海东部海域恩平油田我国海上首口二氧化碳回注井正式投产,采油分离出来的二氧化碳气体被烘干压缩后回注至储层进行封存。为确保注入期间的安全性需要实时掌握注入参数判断井下情况,采用永久式分布式光纤监测技术,实现了全井筒温度剖面及井底压力的实时动态监测。现场应用结果表明:分布式光纤温度监测剖面与地层梯度测试温度剖面误差0.1%,光纤压力计监测结果与注入压力、地层压力误差0.05%,根据光纤数据监测的分布解释结果可反演二氧化碳回注剖面,从而指导注气参数动态调整。

关键词：二氧化碳回注永久式光纤井筒完整性管外窜流

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越南地方政府公务员培训问题与对策研究 ——以越南和平省为例

越南地方政府公务员培训问题与对策研究 ...

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作者： BUI dang khoa（裴登科）华东师范大学

学位级别：硕士

随着经济全球化的进一步发展、科学技术的不断创新,世界各个国家的竞争日益加强,人们对于政府替公共服务质量和效率的要求也越来越高,这在客观上要求世界各个国家的公务员要不断的提高自身的素质和能力,以适应快速发展的社会要求,更好... 详细信息

随着经济全球化的进一步发展、科学技术的不断创新,世界各个国家的竞争日益加强,人们对于政府替公共服务质量和效率的要求也越来越高,这在客观上要求世界各个国家的公务员要不断的提高自身的素质和能力,以适应快速发展的社会要求,更好地为公众提供共服务。而公务员不断提高自身素质和能力最重要的途径就是参见公务员培训,不断提升素质、改善自身能力结构。与此同时,人力资源开发与管理理论的不断发展完善为公务员培训提供了理论支撑和技术工具,这种情况下世界各国不断探索和创新公务员培训的理念,方法与途径。当前,越南正处于经济与社会发展的关键时期,从1986年实行改革开放以来,越南政府通过深化改革、大力吸引外资等手段,使得经济稳步增长,发展迈上了一个新台阶。越南共产党和政府要想拥有更强大的能力和竞争优势,必须全面提高政府工作人员的素质,因此,对公务员进行有效的培训,便被提到议事日程上来。越南公务员培训是在逐步借鉴世界各国公务员培训的普遍做法的基础上建立起来的。公务员培训作为提高国家公务员整体素质的一个重要手段,直接影响着政府工作。建立和完善公务员培训制度,是适应当前越南国情和国际大环境的必然要求。然而,目前越南公务员培训仍存在着一些不足之处,尤其是地方政府公务员培训的质量不高,实效欠佳,是个不容忽视的客观问题,影响实效的因素是多方面的。这需要及时的发现并积极寻找对策,增强越南地方政府公务员培训工作实效性的途径和思路,提高在市场经济体制下地方政府公务员培训的质量,以完善公务员培训的工作,是一个很现实意义的课题。本论文以越南和平省为例,对越南地方政府公务员培训进行研究,其研究内容由五章组成。第一章为导论,主要阐述了本课题的研究背景,研究目的和意义,描述当前国内外公务员培训的研究现状,介绍论文的研究方法,研究的思路和篇章逻辑设计;第二章主要介绍地方政府公务员培训的相关概念与理论基础;第三章结合越南地方政府公务员培训的现状分析—以越南和平省为例,第四章指出越南地方政府公务员培训存在的问题和原因分析通过分析越南和平省公务员培训工作;第五章在前面分析研究的基础上提出完善越南地方政府公务员培训的相关对策;第六章得出了本论文的结论。

关键词：越南地方政府和平省公务员培训问题与对策

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