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A self-healing coating based on facile pH-responsive nanocontainers for corrosion protection of magnesium alloy

Journal of Magnesium and Alloys 2022年第3期10卷 904-919页

作者： yuejun Ouyang Lin-Xin Li Zhi-hui Xie Lili Tang Fuhui Wang Chuan-jian Zhong Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol(PVA)Fiber Material Huaihua UniversityHuaihua 418000PR China Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province/Institute of Synthesis and Application of Functional Materials College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002PR China Shenyang National Laboratory for Materials Science Northeastern University3-11 Wenhua RoadShenyang 110819PR China Department of Chemistry State University of New York at BinghamtonBinghamtonNY 13902USA

The preparation of pH-responsive nanocontainers by typical silane modification of the mesoporous silica nanoparticle(MSN)surface is usually high-cost,complex,and time-consuming,which remains a great challenge for effective corrosion protection of magnesium ***,a new strategy to construct pH-responsive nanocontainers(MSN-MBT@LDH)is *** nanocontainers consist of corrosion inhibitor(2-mercaptobenzothiazole,MBT)loaded MSN core and layered double hydroxide(LDH)nanosheet shell serving as *** successful loading of MBT and encapsulation by LDH nanosheets were confirmed by a series of characterization such as scanning transmission electron microscopy coupled with energy dispersive X-ray spectroscopy(STEM-EDS)and N2 adsorption/desorption *** pH-responsive feature of the nanocontainers was demonstrated by determination of the MBT concentration in buffer solutions with different pH values.A smart corrosion protection system on Mg alloy is obtained by incorporating the synthesized nanocontainers into a self-assembled nanophase particle(SNAP)*** electrochemical tests and visual observations show that the hybrid coating has the best barrier properties and robustness in corrosion protection in NaCl corrosive solutions in comparison with the control *** present method simplifies the synthesis processes of nanocontainers and eliminates the potential detrimental effect of excess gatekeepers on the *** findings provide new insights into the preparation of scalable *** self-healing coatings are expected to have widespread applications for corrosion protection of Mg alloy and other metals.

关键词： Mg alloy Coating Corrosion Layered double hydroxide Nanocontainer.

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Element analysis method of concealed explosive based on TNA

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Nuclear Science and Techniques 2019年第1期30卷 19-25页

作者： Meng Huang jian-yu Zhu Jun Wu Rui Li Institute of Applied Physics and Computational Mathematics Center for Strategic Studies China Academy of Engineering Physics Software Center for High Performance Numerical Simulation China Academy of Engineering Physics

The detection technology of concealed bulk explosives is related to social security and national defense construction and has important research significance. In this paper, an element analysis method of concealed explosives based on thermal neutron analysis is *** method could provide better reconstruction precision for hydrogen, carbon, and nitrogen ratios, making it possible to discriminate explosives from other compounds with the same elements but different proportions, as well as to identify the types of concealed bulk explosives. In this paper, the basic principles and mathematical model of this method are first introduced, and the calculation formula of the element number ratio(the ratio between the nucleus numbers of two different elements) of the concealed explosive is deduced. Second, a numerical simulation platform of this method was established based on the Monte Carlo JMCT code. By calibrating the absorption efficiencies of the explosive device to c rays, the element number ratios of a concealed explosive model under the irradiation of thermal neutrons were reconstructed from the neutron capture prompt c-ray spectrum. The reconstruction values were in good agreement with the actual values,which shows that this method has a high reconstruction precision of the element number ratio for concealed explosives. Lastly, it was demonstrated using the simulation study that this method can discriminate explosives,drugs, and common materials, with the capability of determining the existence of concealed bulk explosives and identifying explosive types.

关键词： Concealed bulk explosive Explosive type identification TNA Element number ratio

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A social tag clustering method based on common co-occurrence group similarity

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Frontiers of Information Technology & Electronic Engineering 2016年第2期17卷 122-134页

作者： hui-zong LI Xue-gang HU Yao-jin LIN Wei HE jian-han PAN School of Computer and Information Hefei University of Technology School of Economics and Management Anhui University of Science and Technology School of Computer Minnan Normal University

Social tagging systems are widely applied in Web *** users use these systems to create,organize,manage,and share Internet resources ***,many ambiguous and uncontrolled tags produced by social tagging systems not only worsen users' experience,but also restrict resources' retrieval *** clustering can aggregate tags with similar semantics together,and help mitigate the above *** this paper,we first present a common co-occurrence group similarity based approach,which employs the ternary relation among users,resources,and tags to measure the semantic relevance between *** we propose a spectral clustering method to address the high dimensionality and sparsity of the annotating ***,experimental results show that the proposed method is useful and efficient.

关键词： Social tagging systems Tag co-occurrence Spectral clustering Group similarity

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Glu R2-3Y Inhibits the Acquisition and Reinstatement of Morphine-Induced Conditioned Place Preference in Rats

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Neuroscience Bulletin 2016年第2期32卷 177-182页

作者： Xiao-Jing Lin jian-Jun Zhang Long-Chuan yu Laboratory of Neurobiology and the National Laboratory of Biomembrane and Membrane Biotechnology College of Life Sciences Peking University Beijing 100871 China Key Laboratory of Mental Health Institute of PsychologyChinese Academy of Sciences Beijing 100101 China National Institute of Biological Sciences Beijing 102206China

Accumulating evidence indicates that a-amino-3-hydroxy-5-methylisoxazole-4-propionic acid receptors（AMPARs） are involved in the relapse to abused ***, the role of AMPARs containing the Glu R2 subunit in opiate addiction is still unclear. Glu R2-3Y,an interfering peptide, prevents the endocytosis of AMPARs containing the Glu R2 subunit. In this study, we explored the effect of intravenous injection of Glu R2-3Y on the acquisition, expression, and reinstatement of morphine-induced conditioned place preference（m CPP） in rats. We found that infusion of Glu R2-3Y（1.5 nmol/g） one hour before morphine during the conditioning phase inhibited the acquisition of m CPP, while an identical injection one hour before the post-conditioning test had no influence on the expression of m CPP. Injection of Glu R2-3Y（1.5 nmol/g） after m CPP extinction blocked the morphine-induced reinstatement of m CPP. Our results strongly support the hypothesis that inhibition of AMPAR endocytosis provides a new target for the treatment of opiate addiction.

关键词： Glu R2-3Y AMPA receptors Morphine Conditioned place preference Acquisition of mCPP Reinstatement of mCPP

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Angular distribution coefficients of Z(W) boson produced in e^+e^- collisions at s^(1/2) = 240 GeV

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Chinese Physics C 2019年第4期43卷 54-62页

作者： yu-Dong Wang jian-Xiong Wang Institute of High Energy Physics Chinese Academy of Sciences School of Physics University of Chinese Academy of Sciences

At the designed circular electron-positron collider(CEPC), similar to the hadron collider, the angular distribution coefficients of the decay lepton pair from the produced Z(W) boson in e^+e^- collisions are predicted. Their dependence on cosθZ(cosθW) are presented in four different polarization frames. Furthermore, the value of the angular distribution coefficients in different bins of cosθZ are presented in the C-S frame. In comparison with the case at the hadron collider, better accurate measurement for Z(W) is expected because there is less background, and W could be reconstructed from its leptonic decay channel. This works provides a method to precisely test the electroweak production mechanism or some effect induced from new physics in the future measurements at the CEPC.

关键词： Drell-Yan process Z boson CEPC angular distribution coefficients

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气体雾化过程中涉及颗粒形貌和空心颗粒形成的金属液滴变形和破碎数值模拟

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Transactions of Nonferrous Metals Society of China 2024年第7期34卷 2074-2094页

作者：汪鹏黎兴刚周香林陈志培王淼辉甘萍任晓娜余志勇北京科技大学新金属材料国家重点实验北京100083 中机新材料研究院(郑州)有限公司郑州450001 南方科技大学材料科学与工程系深圳518055 北京科技大学材料科学与工程学院北京100083 中国联合重型燃气轮机技术有限公司北京100016

采用考虑液滴冷却和凝固的流体体积(VOF)方法模拟金属液滴在气体雾化过程中的变形和破碎。建立典型粉末形貌和液滴破碎行为之间的相关性,以指导球形粉末颗粒的制备。结果显示,当增加液滴的气动力与黏性力的比值时,球形颗粒的形成得到加... 详细信息

采用考虑液滴冷却和凝固的流体体积(VOF)方法模拟金属液滴在气体雾化过程中的变形和破碎。建立典型粉末形貌和液滴破碎行为之间的相关性,以指导球形粉末颗粒的制备。结果显示,当增加液滴的气动力与黏性力的比值时,球形颗粒的形成得到加强;然而,当减小这个比值时,预期的液滴破碎模型将被改变或仅仅只发生液滴的变形。从空心颗粒的形成和演变过程的数值模拟中观察到几种典型的情况,例如,开放的空心液膜的形成、液膜封闭、气泡的离心和气泡的脱离。通过提高气体速度或液滴温度,实现较高的非平衡拉普拉斯压力或较低的粘性力,促使气泡从液滴内部分离。

关键词：液滴破碎空心颗粒颗粒形貌黏性力金属粉末气体雾化

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双环戊二烯单体预聚增粘及其碳纤维增强复合材料性能评价

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复合材料学报 2024年第1期41卷 155-169页

作者：程超张晨宇裴志磊陈正国周飞周金利张辉孙泽玉余木火东华大学材料科学与工程学院纤维材料改性国家重点实验室上海201620 上海工程技术大学材料工程学院上海201620 上海碳纤维复合材料创新研究院有限公司上海201512 中国石化上海石油化工股份有限公司化工部上海200540 中原工学院纺织学院郑州450007

聚双环戊二烯(PDCPD)作为一种综合性能优异的热固性树脂,可与连续碳纤维进行复合,应用在工程领域上,以满足轻量化和节能环保需求。本文首先通过调节双环戊二烯单体(DCPD)与Grubbs 2代催化剂的质量比使其只聚合不交联,调节黏度以满足真... 详细信息

聚双环戊二烯(PDCPD)作为一种综合性能优异的热固性树脂,可与连续碳纤维进行复合,应用在工程领域上,以满足轻量化和节能环保需求。本文首先通过调节双环戊二烯单体(DCPD)与Grubbs 2代催化剂的质量比使其只聚合不交联,调节黏度以满足真空辅助灌注成型(VARI)工艺对树脂特性的要求。随后对碳纤维表面进行丙酮去浆处理,再与上述加入足量催化剂的预聚物进行复合。对比PDCPD复合材料与通用型环氧树脂复合材料的拉伸、弯曲、V型缺口剪切、层间Ⅰ型以及Ⅱ型断裂韧性、冲击和热力学性能,研究PDCPD复合材料在不同加载模式下的失效机制,探寻其在工程领域应用的关键点和方向。结果表明,去浆后碳纤维与PDCPD界面结合良好,PDCPD复合材料在强度上与环氧树脂相当,在抵抗变形能力上较弱,但是在遭受高于极限强度的载荷后,仍然具有一定程度的承载能力;从层间断裂韧性来看,PDCPD复合材料Ⅰ型断裂韧性和Ⅱ型断裂韧性分别相当于环氧树脂复合材料的406%和250%,具有优异的抵抗分层能力;对比两种复合材料抗冲击性能,3.2 mm的PDCPD复合材料层合板在40 J能量的冲击下,表面产生层合板勉强可见冲击损伤(BVID),背面无明显纤维破裂现象,剩余冲击压缩强度比环氧树脂复合材料高34.7%。

关键词：聚双环戊二烯力学性能复合材料液体成型树脂基复合材料层间断裂韧性

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Repeatability of Ophtha Top topography and comparison with IOL-Master and Lenstar LS900 in cataract patients

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International Journal of Ophthalmology(English edition) 2017年第11期10卷 1703-1709页

作者： Sha-Sha yu hui Song Xin Tang Clinical College of Ophthalmology Tianjin Medical University Tianjin 300020 China Tianjin Eye Hospital Tianjin 300020 China Tianjin Key Laboratory of Ophthalmology and Visual Science Tianjin 300020 China Tianjin Eye Institute Tianjin 300020 China

AIM：To determine the repeatability of Ophtha Top topography and assess the consistency with intraocular lens（IOL）-Master and Lenstar LS900（Lenstar）in measuring corneal parameters among cataract ***：Totally 125 eyes were *** were successively measured with Ophtha Top,IOL-Master and Lenstar at least three *** flattest meridian power（Kf）,the steepest meridian power（Ks）,mean power（Km）,J0 and J45 were ***-class correlation coefficients（ICCs）,the coefficient of variance（COV）,within subject standard deviation（Sw）,and test-retest repeatability（2.77Sw）were adopted to determine the *** 95%limit of agreement（95%LOA）and Bland-Altman plots were used to assess ***：Repeatability of Ophtha Top topography for measuring corneal parameters showed the ICCs were all above 0.93,2.77Sw was lower than 0.31,and the COV of the Kf and Ks was lower than *** keratometric readings with Ophtha Top topography were flatter than with the IOLMaster and Lenstar devices,while the Pearson correlation coefficients were over *** J0 and J45 with Ophtha Top topography were smaller compared with Lenstar and IOL-Master,while was comparable between Lenstar and ***：Ophtha Top topography shows excellent repeatability for measuring corneal ***,differences between the Ophtha TOP topography and Lenstar,IOL-Master both in cornea curvature and the astigmatism should be noted clinically.

关键词： Repeatability of Ophtha Top topography and comparison with IOL-Master and Lenstar LS900 in cataract patients IOL LS

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An Efficient Method for the Synthesis of Acyl-diazenes Using NaNO_2/NaHSO_4·H_2O

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Chinese Chemical Letters 2003年第7期14卷 677-680页

作者： jian Ping LI Ping LIU yu Lu WANG College of Chemistry&Environmental Science Henan Normal UniversityXinxiang 453002 Key Laboratory of Environmental Science and Technology of High Education of Henan Province Xinxiang 453002

An efficient and convenient method for the synthesis of acyl-diazenes is reported. Ten acyl-diazenes have been synthesized from acylhydrazines in excellent yields under mild conditions. There are eight new substances... 详细信息

关键词： Acyl-diazenes acylhydrazines NaNO2/NaHSO4H2O.

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Surface Dislocation Nucleation Mediated Deformation and Ultrahigh Strength in Sub-10-nm Gold Nanowires

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Nano Research 2011年第12期4卷 1261-1267页

作者： Yang Lu Jun Song jian yu Huang Jun Lou Department of Mechanical Engineering ＆ Materials Science Rice University Houston TX 77005 USA Department of Mining ＆ Materials Engineering McGill University Montreal QC H3A 2B2 Canada Center for Integrated Nanotechnologies （C1NT） Sandia National Laboratories Albuquerque NM 87185 USA Present address： Department of Materials Science and Engineering MIT Cambridge MA 02139 USA

The plastic deformation and the ultrahigh strength of metals at the nanoscale have been predicted to be controlled by surface dislocation nucleation. In situ quantitative tensile tests on individual 〈111〉 single crystalline ultrathin gold nanowires have been performed and significant load drops observed in stress-strain curves suggest the occurrence of such dislocation nucleation. High-resolution transmission electron microscopy （HRTEM） imaging and molecular dynamics simulations demonstrated that plastic deformation was indeed initiated and dominated by surface dislocation nucleation, mediating ultrahigh yield and fracture strength in sub-lO-nm gold nanowires.

关键词： Nanowires in situ transmission electron microscope (TEM) mechanical characterization dislocation nucleation plasticity

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