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Multiscale modeling of mechanical behavior and failure mechanism of 3D angle-interlock woven aluminum composites subjected to warp/weft directional tension loading

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Chinese Journal of Aeronautics 2021年第8期34卷 202-217页

作者： Zhenjun WANG Siyuan YANG Shiping SUN Yingfeng ZHANG Changchun CAI Bowen XIONG wei YANG Zhifeng XU Huan yu School of Aeronautical Manufacturing Engineering Nanchang Hangkong UniversityNanchang 330063China Hunan Aviation Powerplant Research Institute Aero Engine Corporation of ChinaZhuzhou 412002China School of Mechanical Engineering Northwestern Polytechnical UniversityXi'an 710072China

The mechanical behavior and progressive damage mechanism of novel aluminum matrix composites reinforced with 3D angle-interlock woven carbon fibers were investigated using a multiscale modeling *** mechanical properties and failure of yarns were evaluated using a microscale model under different loading *** this basis,a mesoscale model was developed to analyze the tensile behavior and failure mechanism of the *** interfacial decohesion,matrix damage,and failure of fibers and yarns were incorporated into the microscopic and mesoscopic *** stress–strain curves and fracture modes from simulation show good agreement with the experimental curves and fracture *** interface and matrix damage initiate first under warp directional ***,interfacial failure,weft yarn cracking,and matrix failure occur *** fracture of warp yarn,which displays a quasi-ductile fracture characteristic,dominates the ultimate composites *** weft directional tension,interfacial failure and warp yarn rupture occur at the early and middle *** failure and weft yarn fracture emerge simultaneously at the final stage,leading to the cata-strophic failure of *** weft directional strength and fracture strain are lower than the warp directional ones because of the lower weft density and the more serious brittle fracture of weft yarns.

关键词： Aluminum matrix composites Failure mechanism Mechanical behavior Progressive damage Multiscale modeling

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Tunneling Anisotropic Magnetoresistance in L1_0-MnGa Based Antiferromagnetic Perpendicular Tunnel Junction

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Chinese Physics Letters 2018年第8期35卷 88-92页

作者： Xu-Peng Zhao Da-Hai wei Jun Lu Si-wei Mao Zhi-Feng yu Jian-Hua Zhao State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083 College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049

We report on the tunneling anisotropic magnetoresistance in antiferromagnetic perpendicular tunnel junction consisting of L10-MnGa/FeMn/AlOx/Pt grown on GaAs（001） substrates by molecular-beam epitaxy. The temperature-dependent perpendicular exchange bias effect reveals an exchange coupling between ferromagnetic L10-MnGa and antiferromagnetic FeMn. The rotation of antiferromagnetic spins in FeMn can be driven by perpendicularly magnetized L10-MnGa due to the exchange-spring effect at the interface and leads to roomtemperature tunneling anisotropic magnetoresistance ratio of 0.86%. We also find that the tunneling anisotropic magnetoresistance strongly depends on temperature and angle. These results have broadened the material selection range for high performance antiferromagnetic spintronic devices.

关键词： AFM LRS HRS As Pt Ga

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Synthesis of Ti_2CT_x MXene as electrode materials for symmetric supercapacitor with capable volumetric capacitance

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Journal of Energy Chemistry 2019年第4期28卷 11-18页

作者： Kai Zhu yuming Jin Fei Du Shuang Gao Zhongmin Gao Xing Meng Gang Chen Yingjin wei yu Gao Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Key Laboratory of Physics and Technology for Advanced Batteries Ministry of Education College of Physics Jilin University State Key Laboratory of Inorganic Synthesis and Preparative Chemistry Jilin University State Key Laboratory of Superhard Materials Jilin University

Two-dimensional(2D)metal carbides,MXene,present the promising application for the energy storage *** the MXene family,Ti_2CT_xas the lightest material,shows its unique electrochemical ***,Ti_2CT_xis synthesized by selective etching Al layer from the Ti_2Al *** the optimized HF treating condition,Ti_2CT_xdisplays high volumetric capacitance and remarkable rate ***,the Ti_2CT_x//Ti_2CT_xsymmetric supercapacitor is designed and assembled,which presents capable capacitance,outstanding rate performance and excellent cycling *** remarkable electrochemical performance is attributed to its 2D structure and high electronic *** work demonstrates the potential application of the Ti_2CT_xfor the supercapacitors and provides a template to design highperformance supercapacitors with 2D electrode materials.

关键词： Supercapacitor Two-dimensional material Ti2CTx MXene

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Sheng-Mai-San attenuates contractile dysfunction and structural damage induced by chronic intermittent hypoxia in mice

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Chinese Journal of Natural Medicines 2015年第10期13卷 743-750页

作者： MO wei-Lan CHAI Cheng-Zhi KOU Jun-Ping YAN Yong-Qing yu Bo-Yang Department of Complex Prescription of TCM China Pharmaceutical University Jiangsu Provincial Key Laboratory for TCM Evaluation and Translational Research China Pharmaceutical University

Sheng-Mai-San(SMS), a well-known Chinese medicinal plant formula, is widely used for the treatment of cardiac diseases characterized by deficiency of Qi and Yin syndrome. A mouse chronic intermittent hypoxia(CIH) model was established to mimic the primary clinical features of deficiency of Qi and Yin syndrome. Mice experienced CIH for 28 days(nadir 7% to peak 8% oxygen, 20 min per day), resulting in left ventricle(LV) dysfunction and structure abnormalities. After administration of SMS(0.55, 1.1, and 5.5 g·kg-1·d-1) for four weeks, improved cardiac function was observed, as indicated by the increase in the ejection fraction from the LV on echocardiography. SMS also preserved the structural integrity of the LV against eccentric hypotrophy, tissue vacuolization, and mitochondrial injury as measured by histology, electron microscopy, and ultrasound assessments. Mechanistically, the antioxidant effects of SMS were demonstrated; SMS was able to suppress mitochondrial apoptosis as indicated by the reduction of several pro-apoptotic factors(Bax, cytochrome c, and cleaved caspase-3) and up-regulation of the anti-apoptosis factor Bcl-2. In conclusion, these results demonstrate that SMS treatment can protect the structure and function of the LV and that the protective effects of this formula are associated with the regulation of the mitochondrial apoptosis pathway.

关键词： Sheng-Mai-San Chronic intermittent hypoxia Contractile dysfunction Left ventricle Mitochondrial apoptosis

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Efficient recovery of tungsten from scheelite concentrates using a sulfur-phosphorus mixed acid leaching system

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Tungsten 2024年第4期6卷 821-832页

作者： Jiang-Tao Li Li-Li Gao Zhong-wei Zhao Xu-Heng Liu Xing-yu Chen School of Metallurgy and Environment Central South UniversityChangsha410083China Key Laboratory of Hunan Province for Metallurgy and Material Processing of Rare Metals Changsha410083China

In recent years,a new process for leaching scheelite concentrates with sulfur-phosphorus mixed acid has been successfully *** process suffers from the elimination of the retarding effect of calcium sulfate,the selective extraction of tungsten from the H_(3)PW_(12)O_(40)-H_(2)SO_(4)-H_(3)PO_(4)mixture solution,and the removal of introduced ***,in this paper,we investigated the inhibition measures of a calcium sulfate-blocking membrane,the selective extraction of tungsten by ion exchange,and the removal of phosphorus by the magnesium ammonium salt *** results showed that the addition of calcium sulfate whisker seeds and a higher H_(3)PO_(4)concentration inhibited spontaneous diffuse nucleation,promoted crystal growth,and avoided the formation of a dense blocking *** 98 wt.%of the scheelite concentrate was digested by H_(2)SO_(4)-H_(3)PO_(4).The selective adsorption of PW_(12)O_(40)^(3-)was realized using D301 resin,and the extraction efficiency of tungsten exceeded 99.9%.After desorption with ammonia water,PW_(12)O_(40)^(3-)was depolymerized into WO_(4)^(2-)and PO_(4)^(3-).99.9 wt.%of phosphorus was removed in the form of MgNH_(4)PO_(4)by the magnesium ammonium salt method,and the residual phosphorus concentration in the solution was lower than 10 mg·L^(-1).After purification,the highest-grade ammonium paratungstate product was prepared by evaporative crystallization.

关键词： Scheelite concentrates Sulfur-phosphorus mixed acid Calcium sulfate Ion exchange Tungsten

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Dyeing bacterial cellulose pellicles for energetic heteroatom doped carbon nanofiber aerogels

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Nano Research 2014年第12期7卷 1861-1872页

作者： Zhen-yu Wu Hai-wei Liang Chao Li Bi-Cheng Hu Xing-Xing Xu Qing Wang Jia-Fu Chen Shu-Hong yu Division of Nanomaterials and Chemistry Hefei National Laboratory for Physical Sciences at Microscale Collaborative InnovationCenter of Suzhou Nano Science and Technology Department of Chemistry University of Science and Technology of China HefeiAnhui 230026 China

The energy crisis and environmental pollution are serious challenges that humanity will face for the long-term. Despite tremendous efforts, the development of environmentally friendly methods to fabricate new energy materials is still challenging. Here we report, for the first time, a new strategy to fabricate various doped carbon nanofiber （CNF） aerogels by pyrolysis of bacterial cellulose （BC） pellicles which had adsorbed or were dyed with different toxic organic dyes. The proposed strategy makes it possible to remove the toxic dyes from waste-water and then synthesize doped CNF aerogels using the dyed BC pellicles as precursors. Compared with other reported processes for preparing heteroatom doped carbon （HDC） nanomaterials, the present synthetic method has some significant advantages, such as being green, general, low-cost and easily scalable. Moreover, the as-prepared doped CNF aerogels exhibit great potential as electrocatalysts for the oxygen reduction reaction （ORR） and as electrode materials for supercapacitors.

关键词： doped carbon nanofiberaerogels electrocatalysts oxygen reduction reaction supercapacitors organic dyes bacterial cellulose

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Platinum nickel alloy-MXene catalyst with inverse opal structure for enhanced hydrogen evolution in both acidic and alkaline solutions

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Nano Research 2023年第1期16卷 195-201页

作者： wei kong Lihong Li Xiaoxia yu Zhongyuan Xiang Yawei Cao Muhammad Tahir Zehua Lu Jinxia Deng Yanlin Song Key Laboratory of Green Printing CAS Research/Education Centre for Excellence in Molecular SciencesInstitute of Chemistry Chinese Academy of Sciences(ICCAS)Beijing 100190China School of Chemistry and Biological Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China

The development of an efficient Pt-based electrocatalyst in acidic and alkaline electrolytes is of great significance to the field of electrocatalytic hydrogen ***,we report a strategy for in situ growth of Pt_(3)Ni truncated octahedrons on Ti3C2Tx nanosheets and then obtain an ordered porous catalyst via a template ***,we use the finite element calculation to clarify the relationship between the component structure and performance and find that the performance of the spherical shell microstructure catalyst is higher than that of the disc structure catalyst,which is also verified by *** experimental analysis shows that the ordered porous catalyst is conducive to enhancing electrocatalytic hydrogen evolution activity in acidic and alkaline *** an acidic solution,the overpotential is 25 mV(10 mA·cm^(−2)),and the Tafel slope is 22.86 mV·dec−*** an alkaline solution,the overpotential is 44.1 mV(10 mA·cm^(−2)),and the Tafel slope is 39.06 mV·dec−*** synergistic coupling between Ti3C2Tx and Pt_(3)Ni nanoparticles improves the stability of the *** in situ growth strategy and design of microstructure with its correlation with catalytic performance represent critical steps toward the rational synthesis of catalysts with excellent catalytic activity.

关键词： hydrogen evolution reaction MXene Pt_(3)Ni truncated octahedrons ordered porous structures

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The Masses of a Sample of Radial-velocity Exoplanets with Astrometric Measurements

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Research in Astronomy and Astrophysics 2023年第5期23卷 236-267页

作者： Guang-Yao Xiao yu-Juan Liu Huan-yu Teng wei Wang Timothy D.Brandt Gang Zhao Fei Zhao Meng Zhai Qi Gao Department of Physics College of ScienceTibet UniversityLhasa 850000China Key Laboratory of Cosmic Rays(Tibet University) Ministry of EducationLhasa 850000China CAS Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of ScienceBeijing 100049China Department of Earth and Planetary Sciences School of ScienceTokyo Institute of Technology2-12-1 OokayamaMeguro-kuTokyo 152-8551Japan Department of Physics University of CaliforniaSanta BarbaraSanta BarbaraCA 93106USA

Being one of the most fundamental physical parameter of astronomical objects,mass plays a vital role in the study of exoplanets,including their temperature structure,chemical composition,formation,and ***,nearly a quarter of the known confirmed exoplanets lack measurements of their *** is particularly severe for those discovered via the radial velocity(RV)technique,which alone could only yield the minimum mass of *** this study,we use published RV data combined with astrometric data from a cross-calibrated Hipparcos-Gaia Catalog of Accelerations to jointly constrain the masses of 115 RV-detected substellar companions,by conducting full orbital fits using the public tool *** them,9 exoplanets with M_(p)sini<13.5M_(Jup)are reclassified to the brown dwarf(BD)regime,and 16 BD candidates(13.5≤Mp sini<80M_(Jup))turn out to be low-mass M *** point out the presence of a transition in the BD regime as seen in the distributions of host star metallicity and orbital eccentricity with respect to planet *** confirm the previous findings that companions with masses below 42.5 M_(Jup)might primarily form in the protoplanetary disk through core accretion or disk gravitational instability,while those with masses above 42.5 M_(Jup)formed through the gravitational instability of a molecular cloud like *** effects and detection biases,which may affect our analysis to some extent,are discussed.

关键词： techniques radial velocities-astrometry--stars formation-catalogs

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An Intelligent Recommendation System for Real Estate Commodity

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Computer Systems Science & Engineering 2022年第9期42卷 881-897页

作者： Tsung-Yin Ou Guan-yu Lin Hsin-Pin Fu Shih-Chia wei Wen-Lung Tsai Department of Marketing and Distribution Management National Kaohsiung University of Science and TechnologyKaohsiung824Taiwan College of Management National Kaohsiung University of Science and TechnologyKaohsiung824Taiwan Department of Information Management Asia Eastern University of Science and TechnologyNew Taipei220Taiwan

Most real estate agents develop new objects by visiting unfamiliar clients, distributing leaflets, or browsing other real estate trading website platforms,whereas consumers often rely on websites to search and compare prices when purchasing real property. In addition to being time consuming, this search processrenders it difficult for agents and consumers to understand the status changes ofobjects. In this study, Python is used to write web crawler and image recognitionprograms to capture object information from the web pages of real estate agents;perform data screening, arranging, and cleaning;compare the text of real estateobject information;as well as integrate and use the convolutional neural networkof a deep learning algorithm to implement image recognition. In this study, dataare acquired from two business-to-consumer real estate agency networks, i.e., theSinyi real estate agent and the yungching real estate agent, and one consumer-toconsumer real estate agency platform, i.e., the, FiveNineOne real estate agent. Theresults indicate that text mining can reveal the similarities and differences betweenthe objects, list the number of days that the object has been available for sale onthe website, and provide the price fluctuations and fluctuation times during thesales period. In addition, 213,325 object amplification images are used as a database for training using deep learning algorithms, and the maximum image recognition accuracy achieved is 95%. The dynamic recommendation system for realestate objects constructed by combining text mining and image recognition systems enables developers in the real estate industry to understand the differencesbetween their commodities and other businesses in approximately 2 min, as wellas rapidly determine developable objects via comparison results provided by thesystem. Meanwhile, consumers require less time in searching and comparingprices after they have understood the commodity dynamic information, therebyallowing the

关键词： Real estate agency web crawler image comparison text mining deep learning real estate object dynamic recommendation system

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Effects of aging treatment processes on microstructures and mechanical properties of AZ63 casting magnesium alloy

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China Foundry 2023年第4期20卷 307-314页

作者： Chun-yu Li Hao-bo wei Shi-hui Ruan Jie-yi Chen Zong-gang Wu Ming-bo Yang Materials Science&Engineering College Chongqing University of TechnologyChongqing 400050China

The effects of three different aging treatment processes,namely single-stage,double-stage,and reverse double-stage aging treatment processes,on the microstructures and mechanical properties of the AZ63(Mg-6Al-3Zn-0.25Mn)casting magnesium alloy were investigated and *** results indicate that the microstructures of all the aged alloys under the three treatment processes are mainly composed ofα-Mg,Mg17Al12),and Al4Mn phases,indicating that the double-stage and reverse double-stage aging treatments have no obvious effect on the type of alloy ***,as compared with the single-stage and double-stage processes,the reverse double-stage process has a great effect on the quantity of the *** the reverse double-stage aging treatment,which results in a stronger drive for decomposition of the supersaturated solid solution,the number of Mg17Al12phases precipitated in the grains significantly *** addition,as compared with the single-stage aged alloy,the tensile properties at room temperature for both the double-stage and reverse double-stage aged alloys are significantly *** them,the reverse double-stage aged alloy achieves the highest tensile strength,yield strength,and elongation of 295 MPa,167 MPa,and 8.6%,respectively.

关键词： magnesium alloys Mg-Al based alloys AZ63 alloy heat treatment aging treatment

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