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Progress in Natural Science:Materials International 2019年第4期29卷 425-431页

作者： Zhenghua Deng Haiqing Yin Cong Zhang Guofei Zhang Tong Zhang ZiKui Liu Haibao Wang Xuanhui Qu Collaborative Innovation Center of Steel technology University of Science and Technology Beijing Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and technology University of Science and Technology Beijing Department of Materials Science and Engineering The Pennsylvania State University Chongqing Engineering technology Research Center for Light Alloy and Processing Chongqing Three Gorges University

The sintering behavior of Cu-9A1 alloys prepared from die pressing of elemental powders was *** experimental results and kinetic analysis showed the formation of three consecutive layers of Al;Cu,Al;Cu;,and AlCu phases,with Al;Cu appearing first in the initial solid phase sintering stage.A liquid phase formed in the intermediate stage,resulting from the eutectic reaction between A1 and Al;Cu phases at 500℃,which is 47℃lower than the equilibrium reaction *** occurred when the liquid phase infiltrated the gaps between the copper particles,leaving pores at the original sites of A1 particles and Al;*** the final stage of sintering,the Al-rich phases（Al;Cu and AlCu） transformed to Al-poor phases（Al;Cu;and a-Cu） in the temperature range of 500-565℃.Al;Cu;and a-Cu then transformed to AlCu;（β） above the eutectoid reaction temperature（565℃）,whereas AlCu;transformed to a-Cu and eutectoid phases（α-Cu+Al;Cu;） during *** pure copper transformed to AlCu;) and the pore volume decreased at 1000℃.The microstructure study helps manipulate precisely the sintering process of Cu-Al alloys and optimize the microstructure with a high dimensional accuracy.

关键词： Cu-9Al alloy Liquid phase sintering Swelling behavior Diffusion

Acute and Chronic Toxicity of Indole Alkaloids from Leaves of Alstonia scholaris (L.) R. Br. in Mice and Rats

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Natural Products and Bioprospecting 2020年第2期10卷 77-88页

作者： Yun-Li Zhao Min Su Jian-Hua Shang Xia Wang Guy Sedar Singor Njateng Guang-Lei Bao Jia Ma Qing-Di Sun Fang Yuan Jing-Kun Wang Xiao-Dong Luo state key laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunming 650201People’s Republic of China Yunnan Institute of Medical Material Kunming 650111People’s Republic of China key laboratory of Medicinal Chemistry for Natural Resource Ministry of Education and Yunnan ProvinceSchool of Chemical Science and TechnologyYunnan UniversityKunming 650091People’s Republic of China laboratory of Microbiology and Antimicrobial Substances Faculty of ScienceUniversity of DschangP.O.Box 67DschangCameroon Jiangsu Nhwa Pharmaceutical Co. LtdXuzhou 221009People’s Republic of China

Alstonia scholaris(L.)***.(Apocynaceae)is an evergreen tree that has been used to treat lung *** this study,the toxicity profile of indole alkaloids from leaves of *** was *** acute toxicity tests,mice were adminis-tered total alkaloids(TA)and five indole *** a chronic toxicity test,rats were continuously administered TA(50,100,and 300 mg/kg bw)for 13 weeks,followed by a 4-week recovery.A single administration of TA affected the behavior of mice,and at 12.8 g/kg bw,prone position,shortness of breath,wheezing,and convulsion were *** half-lethal dose(LD50)in mice was 5.48 g/kg bw,almost 2740 times the clinical dose in *** the five indole alkaloids,the maximum tolerance dose in mice ranged from 0.75 to 4 g/kg *** TA-treated rats did not die and showed no adverse effects or dose-dependent changes in weight or food and water consumption,despite fluctuations in hematological and bio-chemical parameters compared with historical ***,both gross and histopathological observations revealed no abnormalities in any *** daily oral administration to rats,the non-observed-adverse-effect-level of TA was 100 mg/kg *** results indicate that TA is safe for clinical use.

关键词： Alstonia scholaris Indole alkaloids Acute toxicity Chronic toxicity Non-observed-adverse-effect-level

Microstructure and Temperature Distribution in ZnAl_2O_4 Sintered Body by Pulse Electric Current

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Journal of Materials Science & technology 2003年第6期19卷 526-528页

作者： Dongming ZHANG, Zhengyi FU and Jingkun GUOstate key Lab. of Advanced technology for Materials Synthesis and Processing, Wuhan University of technology, Wuhan 430070, China Wuhan Univ Technol State Key Lab Adv Technol Mat Synth & Proc Wuhan 430070 Peoples R China

Microstructure of reaction sintering of ZnAl2O4 at 1500℃ by hot-pressing(HP) and pulse electric current was investigated. The results indicated that the existed cracks in sintered body were caused by structure mismatch. It is the evidence that periodical temperature field existed during pulse electric current sintering of nonconductive materials. The distance between high temperature areas was related to die diameter.

关键词： Pulse electric current sintering Reaction sintering ZnAl2O4,Microstructure Temperature distribution.

Experimental research and application of cold cutting to hot stamping parts based on multiphase microstructure

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宝钢技术研究:英文版 2023年第3期17卷 1-8页

作者： WU Yanjun LUO Aihui WANG Chenlei Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201999China state key laboratory of Development and Application technology of Automotive Steels(Baosteel) Shanghai 201999China

Among the bottlenecks that hinder the improvement of the production efficiency of hot stamping are high strength and difficulty in edge cutting and hole *** from the preparation of hot stamping multiphase microstructure materials,this paper developed a plate quenching die system with controllable surface temperature and prepared four types of hot stamping plates with different martensite volume ***,straight edge cold cutting experiments were performed to study the influence of cutting clearance and cutting force on fracture *** results show that the bright zone is the largest when the cutting clearance is 0.14 mm,and the cutting experience coefficient of the hot stamping sheet with each martensite volume fraction is obtained when the cutting clearance is 0.14 *** research results of this paper were applied to the production of hot stamping parts.

关键词： hot stamping cold cutting multiphase microstructure

New development on additive manufacturing technology and its applications

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Engineering Sciences 2013年第1期11卷 48-53页

作者： Tian Xiaoyong Li Dichen Zhang Anfeng Lu Zhongliang Lu Bingheng School of Mechanical Engineering Xi'an Jiaotong University state key laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University

Additive manufacturing technology has been developed in Xi＇ an Jiaotong University for almost 20 years. Up to now~ it is still attracting the attentions of the researchers or manufacturers all over the world. Some in- novative processes and frontier application research are all being conducted here to catch up with the new develop- ment of this technology. In the paper, newly developed processes, such as ultraviolet-light emitting diode （UV- LED） stereolithography, ceramic stereolithography, and direct metal forming, were described. Some results of the frontier application researches, such as indirect fabrication of ceramic casting mould, wind-tunnel-testing models, photonic crystals and metamatcrials, were also briefly reviewed.

关键词： additive manufacturing rapid prototyping stereolithography

The Role of Processing Solvent on Morphology Optimization for Slot-die Printed Organic Photovoltaics

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Chinese Journal of Polymer Science 2023年第6期41卷 842-850,I0005页

作者： Lei Wang Jun-Zhe Zhan Wen-Kai Zhong Lei Zhu Guan-Qing Zhou Tian-Yu Hao Ye-Cheng Zou Zhen-Hua Wang Gang Wei Yong-Ming Zhang Feng Liu School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Frontiers Science Center for Transformative Molecules Center of Hydrogen ScienceSchool of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai200240China state key laboratory of Fluorinated Functional Membrane Materials and Dongyue Future Hydrogen Energy Materials Company Zibo 256401China

The morphology manipulation of the active layers is important for improving the performance of organic photovoltaics(OPVs).The choice of processing solvent has great impact on the crystallization and phase separation during film formation,since solvent properties,including solvent effect on molecular crystallization,boiling point,and interaction parameters,can directly change the evolution pathways associated with thermodynamics and ***,revealing the underlying solvent-regulated morphology mechanism is potential to provide guiding strategies for device *** this study,chloroform,chlorobenzene,and toluene are used to process PM6:Y6 blends by slot-die printing to fabricate OPV *** chloroform printed film forms a fibrillar network morphology with enhanced crystallization,facilitating exciton dissociation,charge transport and extraction,resulting in an optimal power conversion efficiency of 16.22%.However,the addition of the additive chloronaphthalene in chloroform solution leads to over-crystallization of Y6,and thus,increasing domain size that exceeds the exciton diffusion length,resulting in lower device *** addition,both the chlorobenzene and toluene suppress the crystallization of Y6,which drastically decreased short-circuit current and fill *** results demonstrate the important role of processing solvent in dictating film morphology,which critically connects with the resultant printed OPV performance.

关键词： crystallization chloroform film

Advances and Trends on Tube Bending Forming Technologies

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Chinese Journal of Aeronautics 2012年第1期25卷 1-12页

作者： YANG He LI Heng ZHANG Zhiyong ZHAN Mei LIU Jing LI Guanjun state key laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China Chengdu Aircraft Industry(Group)Corporation Ltd. Chengdu 610092China

As one kind of key components with enormous quantities and diversities, the bent tube parts satisfy the increasing needs for lightweight and high-strength product from both materials and structure aspects. The bent tubes have been widely used in many high-end industries such as aviation, aerospace, shipbuilding, automobile, energy and health care. The tube bending has become one of the key manufacturing technologies for lightweight product forming. Via the analysis of bending characteristics and multiple defects, advances on exploring the common issues in tube bending are summarized regarding wrinkling instability at the intrados, wall thinning （cracking） at the extrados, springback phenomenon, cross-section deformation, forming limit and process/ tooling design/optimization. Some currently developed bending techniques are reviewed in terms of their advantages and limitations. Finally, in view of the urgent requirements of high-performance complex bent tube components with difficult-todeform and lightweight materials in aviation and aerospace fields, the development trends and corresponding challenges are presented for realizing the precise and high-efficiency tube bending deformation.

关键词： tube bending forming lightweight high strength defects aviation aerospace

Highly Sensitive Poly-N-isopropylacrylamide Microgel-based Electrochemical Biosensor for the Detection of SARS-COV-2 Spike Protein

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Biomedical and Environmental Sciences 2023年第3期36卷 269-278页

作者： CHEN Hao HOU Zhi Yuan CHEN die LI Ting WANG Yi Ming DE LIMA Marcelo Andrade YANG Ying GUO Zhen Zhong Department of Anaesthesiology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030HubeiChina Hubei Province key laboratory of Occupational Hazard Identification and Control Wuhan University of Science and TechnologyWuhan 430065HubeiChina Department of Pharmacy Medical CollegeWuhan University of Science and Technology Wuhan 430065HubeiChina School of Public Health Medical CollegeWuhan University of Science and Technology Wuhan 430065HubeiChina School of Life Sciences Keele UniversityStaffordshire ST55BGUK School of Pharmacy and Bioengineering Keele UniversityStaffordshire ST47QBUK

Objective Late 2019 witnessed the outbreak and widespread transmission of coronavirus disease 2019(COVID-19),a new,highly contagious disease caused by novel severe acute respiratory syndrome coronavirus 2(SARS-CoV-2).Consequently,considerable attention has been paid to the development of new diagnostic tools for the early detection of *** In this study,a new poly-N-isopropylacrylamide microgel-based electrochemical sensor was explored to detect the SARS-CoV-2 spike protein(S protein)in human *** microgel was composed of a copolymer of N-isopropylacrylamide and acrylic acid,and gold nanoparticles were encapsulated within the microgel through facile and economical *** electrochemical performance of the sensor was evaluated through differential pulse *** Under optimal experimental conditions,the linear range of the sensor was 10-13-10-9 mg/m L,whereas the detection limit was 9.55 fg/***,the S protein was instilled in artificial saliva as the infected human saliva model,and the sensing platform showed satisfactory detection *** The sensing platform exhibited excellent specificity and sensitivity in detecting spike protein,indicating its potential application for the time-saving and inexpensive detection of SARS-CoV-2.

关键词： Microgel SARS-CoV-2 Spike protein Detection

Shining light on transition metal sulfides:New choices as highly efficient antibacterial agents

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Nano Research 2021年第8期14卷 2512-2534页

作者： Hecheng Han Jingjing Yang Xiaoyan Li Yuan Qi Zhengyi Yang Zejun Han Yanyan Jiang Martina Stenzel Hui Li Yixin Yin Yi Du Jiurong Liu Fenglong Wang key laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong UniversityJinan 250061China Department of Endodontics School and Hospital of StomatologyCheeloo College of Medicine&Shandong Key Laboratory of Oral Tissue Regeneration&Shandong Engineering Laboratory for Dental Materials and Oral Tissue RegenerationShandong UniversityJinan 250012China Suzhou Institute of Shandong University Suzhou 215123China ShenZhen Research Institute of Shandong University Shenzhen 518057China School of Chemistry University of New South WalesSydneyNSW 2052Australia Oral Implantology Center Jinan Stomatology HospitalJinan 250001China

Globally,millions of people die of microbial infection-related diseases every *** more terrible situation is that due to the overuse of antibiotics,especially in developing countries,people are struggling to fight with the bacteria *** emergence of super-bacteria will be an intractable environmental and health hazard in the future unless novel bactericidal weapons are ***,it is critical to develop viable antibacterial approaches to sustain the prosperous development of human *** researches indicate that transition metal sulfides(TMSs)represent prominent bactericidal application potential owing to the meritorious antibacterial performance,acceptable biocompatibility,high solar energy utilization efficiency,and excellent photo-to-thermal conversion characteristics,and thus,a comprehensive review on the recent advances in this area would be beneficial for the future *** this review article,we start with the antibacterial mechanisms of TMSs to provide a preliminary ***,the state-of-the-art research progresses on the strategies for TMSs materials engineering so as to promote their antibacterial properties are systematically surveyed and summarized,followed by a summary of the practical application scenarios of TMSs-based antibacterial ***,based on the thorough survey and analysis,we emphasize the challenges and future development trends in this area.

关键词： antibacterial mechanisms transition metal sulfides surface functionalization strain-selective bactericidal strategies metabolism and toxicology