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Flexural Wave Bandgap Property of a Periodic Pipe with Axial Load and Hydro-Pressure

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Acta Mechanica Solida Sinica 2019年第2期32卷 173-185页

作者： Jiangwei Liu Dianlong Yu zhenfang zhang Huijie Shen Jihong Wen Vibration and Acoustics Research Group Laboratory of Science and Technology on Integrated Logistics Support College of Mechatronics Engineering and Automation National University of Defense Technology Changsha 410073 China College of Power Engineering Naval University of Engineering Wuhan 430033 China

A periodical composite material pipe is proposed based on the Bragg scattering mechanism of phononic crystals (PCs). The band gap (BG) properties of the flexural wave in this PC pipe under axial load and hydro-pressure are calculated using the transfer matrix (TM) method. The frequency response functions (FRFs) of the PC pipe under axial load and hydro-pressure are calculated using the finite element approach, and the mechanism is elucidated to illustrate the phenomenon. The results show that axial load and hydro-pressure and their combination all have a great influence on the flexural vibration proper ties. This research offers theoretical support for research on PC pipes with complex conditions and is of great significance in solving the problem of high pressure.

关键词： Phononic crystals Flexural vibration properties Axial load Hydro-pressure

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缅甸地质矿产特征与矿业投资环境分析

西北地质 2024年第2期57卷 197-208页

作者：何学洲陈秀法张振芳李玉龙陈喜峰张伟波吴松洋中国地质调查局发展研究中心北京100037 中国地质调查局成都地质调查中心四川成都611230

缅甸位于中国西南和印度洋之间,是“一带一路”中缅经济走廊的重要节点,也是中国西南通向印度洋、连接东南亚的便捷通道。缅甸固体矿产资源较为丰富,但地质工作研究程度较低,因而具有良好的矿业投资前景,尤其是近年来缅甸政府陆续更新... 详细信息

缅甸位于中国西南和印度洋之间,是“一带一路”中缅经济走廊的重要节点,也是中国西南通向印度洋、连接东南亚的便捷通道。缅甸固体矿产资源较为丰富,但地质工作研究程度较低,因而具有良好的矿业投资前景,尤其是近年来缅甸政府陆续更新了矿业政策,对外国赴缅矿业投资的限制进行了优化,以此吸引更多的投资者在缅进行矿业勘查开发,振兴缅甸矿业经济。文中介绍了缅甸地质与矿产资源概况、近十年勘查开发形势及主要矿山开发现状,重点解读了近年来缅甸政府颁发的新的《矿业法》和《矿业法实施细则》等文件,以期更加深入地理解缅甸矿业政策的新变化、新动向和新趋势,为中资企业开展缅甸矿业投资开发提供依据。同时,提出相关的建议,包括需要及时跟进矿业市场动态、了解在缅项目负面清单、科学把握政策要点、提前研判与缅甸政府合作的优劣模式以及履行企业社会责任等。笔者分析缅甸资源禀赋和矿业开发现状、深入解读缅甸新颁布的矿业法和矿业政策,对企业在缅甸矿产勘查和矿业投资合作具有一定指导意义。

关键词：区域地质矿产资源矿业政策矿业管理投资环境

Self-assembled thermosensitive luminescent nanoparticles with peptide-Au conjugates for cellular imaging and drug delivery

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Chinese Chemical Letters 2020年第3期31卷 859-864页

作者： Xiaoyuan zhang Wei Liu Haixia Wang Xinne Zhao zhenfang zhang Gerd Ulrich Nienhaus Li Shang Zhiqiang Su State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Advanced Functional Polymer CompositesBeijing University of Chemical TechnologyBeijing 100029China Faculty of Physics and Astronomy Friedrich Schiller University JenaJena 07743Germany Institute of Applied Physics Karlsruhe Institute of Technology(KIT)Karlsruhe 76128Germany Institute of Nanotechnology Karlsruhe Institute of Technology(KIT)Eggenstein-Leopoldshafen 76344Germany e Institute of Toxicology and Genetics Karlsruhe Institute of Technology(KIT)Eggenstein-Leopoldshafen 76344Germany Department of Physics University of Illinois at Urbana-ChampaignUrbanaIL 6J801 United States State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityShaanxi Joint Laboratory of Graphene(NPU)Xi'an 710072China

A facile and efficient strategy has been developed to fabricate a multifunctional,theranostic anticancer drug delivery platform featuring active targeting,controlled drug release and fluorescence imaging for real-time control of *** this end,thermo sensitive poly(N-isopropyl acrylamide)(PNIPAM)nanospheres are decorated with peptide-Au cluster conjugates as a smart nanomedicine platform.A sophisticated trifunctional peptide is designed to release the anticancer drug doxorubicin(DOX),target cells and reduce Au^3+ions to form luminescent Au cluste ***,the peptide-Au cluster moieties are attached to the PNIPAM nanospheres via amide bonds rather than noncovalent interactions,significantly improving their stability in biological medium and drug release *** in vitro experiments showed that DOX was released in an efficient and controlled manner under physiological conditions.

关键词： Peptide-Au bioconjugates PNIPAM nanoparticles Fluorescence Drug delivery Cell imaging

Experimental Study about Activated Water Generated by the Electro-hydraulic Impulse Strengthening the Mechanical Performance of Concrete

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Journal of Materials Science & Technology 2002年第4期18卷 290-292页

作者： Shijin zhang, zhenfang LIAO and Changlin YANGCollege of Mechanical Engineering, Chongqing University, Chongqing 400044, China Chongqing Univ Coll Mech Engn Chongqing 400044 Peoples R China

On the basis of a great number of experiments, it is proved that the strength of concrete is improved greatly when it is mixed with activated water produced by the electro-hydraulic impulse. With the proper parameters, the compression strength of concrete can be increased by 45%. The reason for improvement of concrete strength by using activated water is discussed from the aspect of the structure of molecule.

关键词： Concrete Electro-hydraulic impulse Activated waterx

Unlock the full potential of carbon cloth-based scaffolds towards magnesium metal storage via regulation on magnesiophilicity and surface geometric structure

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Journal of Energy Chemistry 2024年第3期90卷 423-434,I0010页

作者： Jing Liu Min Wang Zhonghua zhang Jinlei zhang Yitao He zhenfang Zhou Guicun Li College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina Department of Pharmacy Jining Medical UniversityRizhao 276826ShandongChina Department of Energy and Power Engineering School of Energy and EnvironmentAnhui University of TechnologyMa’anshan 243000AnhuiChina

The development of rechargeable magnesium(Mg) batteries is of practical significance to upgrade the electric energy storage devices due to exceptional capacity and abundant resources of Mg-metal ***,the reversible Mg electrochemistry suffers from unsatisfied rate capability and lifespan,mainly caused by non-uniform distribution of *** this work,a fresh design concept of threedimensional carbon cloths scaffolds is proposed to overcome the uncontrollable Mg growth via homogenizing electric field and improving magnesiophilicity.A microscopic smooth and nitrogen-containing defective carbonaceous layer is constructed through a facile pyrolysis of ZIF8 on carbon *** revealed by finite element simulation and DFT calculation results,the smooth surface endows with uniform electric field distribution and simultaneously the nitrogen-doping species enable good magnesiophilicity of *** fine and uniform Mg nucleus as well as the inner electrodeposit behavior are also *** a result,an exceptional cycle life of 500 cycles at 4.0 mA cm^(-2) and 4.0 mA h cm^(-2) is firstly realized to our best ***,the functional scaffolds can be cycled for over 2200 h at 2.0 mA cm^(-2) under a normalized capacity of 5.0 mA h cm^(-2),far exceeding previous *** work offers an effective approach to enable the full potential of carbon cloths-based scaffolds towards metal storage for next generation battery applications.

关键词： Magnesium metal anodes Electrodeposition Heterogeneous nucleation

Non-viral gene carrier mediated short hairpin RNA interference for inhibition of tumor cells growth

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Chinese Science Bulletin 2009年第17期54卷 2947-2952页

作者： DUAN YaJun YANG CuiHong zhang zhenfang LIU JianFeng ZHENG JunNian XU Yong KONG DeLing YU YaoTing Key Laboratory of Bioactive Materials Ministry of Education College of Life Science Nankai University Tianjin 300071 China Laboratory of Urology Affiliated Hospital of Xuzhou Medical College Xuzhou 221002 China Department of Urology Second Hospital of Tianjin Medical University Tianjin Institute of Urology Tianjin 300211 China

A tumor-targeting gene vector G250mAb-PEI-PEG has been prepared by modification of polyethylenimine (PEI) with polyethyleneglycol (PEG) and G250, a monoclonal antibody against the G250 antigen on tumor cell surface. The transfection efficiency was as high as 70% in G250 positive HeLa cells, whereas the transfection efficiency was relatively low (30%) in normal NIH3T3 cells. A plasmid encoding the short hairpin RNA (shRNA) specific for nucleostemin gene (NS) was efficiently transfected into the HeLa cells with this nonviral gene vector. RNA interference down-regulated the expression of NS gene in HeLa cells, inhibited cells proliferation and induced apoptosis. However, the growth and activity of the NIH3T3 cells were not affected under the same treatment. These results indicate that the reported nonviral gene vector, G250mAb-PEI-PEG, can target and efficiently deliver genes into HeLa cells, and has the potential for the cervical cancer treatment.

关键词：短发夹RNA RNA干扰病毒基因肿瘤细胞细胞生长载体介导 NIH3T3细胞 HeLa细胞

21世纪以来亚洲大陆勘查新发现主要铜矿床地质特征

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中国地质 2024年第2期51卷 710-718页

作者：陈喜峰张潮张振芳王秋舒陈秀法张福良黄霞张伟波赵东杰李玉龙于瑞王靓靓何学洲王杨刚郝丽荣王小宁中国地质调查局发展研究中心北京100037

1勘查新发现铜矿床概况2000年以来,全球勘查新发现了115个大型铜矿床(S&P Global Market Intelligence, 2024),其中有26个分布在亚洲(图1),占全球勘查新发现大型铜矿床总数量的22.61%,是除拉丁美洲外勘查新发现大型铜矿床数量最多的大... 详细信息

1勘查新发现铜矿床概况2000年以来,全球勘查新发现了115个大型铜矿床(S&P Global Market Intelligence, 2024),其中有26个分布在亚洲(图1),占全球勘查新发现大型铜矿床总数量的22.61%,是除拉丁美洲外勘查新发现大型铜矿床数量最多的大洲。从国家看,2000年以来,亚洲勘查新发现的大型铜矿床主要分布在中国、印度尼西亚、土耳其、菲律宾、蒙古、哈萨克斯坦、伊朗、巴基斯坦等国家;其中,中国是亚洲勘查新发现大型铜矿数量最多的国家,有9个,其余国家新发现大型铜矿床数量均不足5个(表1)。

关键词：铜矿床大型铜矿亚洲大陆矿床地质特征哈萨克斯坦印度尼西亚土耳其巴基斯坦

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地球化学数据处理与分析软件设计与实践

北京测绘 2024年第9期38卷 1277-1283页

作者：何学洲向运川陈秀法王建雄王杨刚吴发富张振芳中国地质调查局发展研究中心北京100037 中国地质调查局武汉地质调查中心湖北武汉430205

为加强我国与世界各国的国际地学合作,推广我国具有自主知识产权的软件技术方法,支撑世界一流新型地质调查局建设,本文利用现代计算机技术、地理信息技术、空间数据库技术和多元统计分析方法等,以组件对象模型(COM)组件技术为基础,利用... 详细信息

为加强我国与世界各国的国际地学合作,推广我国具有自主知识产权的软件技术方法,支撑世界一流新型地质调查局建设,本文利用现代计算机技术、地理信息技术、空间数据库技术和多元统计分析方法等,以组件对象模型(COM)组件技术为基础,利用美国环境系统研究所(ESRI公司)的ArcGIS Engine应用程序编程接口(API)作为地理空间分析处理的研发框架,使用C和C++作为软件各项功能的开发语言,研发了地质勘查数据处理与分析系统(GeoExpl)国际版软件系统,搭建了地球化学数据处理、数据分析、数据管理和地球化学多类型专题图制作一体化的勘查地球化学业务处理流程体系,创造性地以工作空间为管理单元实现了分析数据、处理数据、图形数据和制图成果等综合数据的数据集成管理。通过GeoExpl国际版软件的研发,实现了地球化学数据处理到成果共享的全流程一体化,打破了以往单一国外软件在技术上的垄断,实现了地球化学数据处理与分析各类方法的整合与创新算法研发,本软件在多个项目和国家应用得到积极反馈,证明了该软件技术符合国际合作的需求。

关键词：地球化学填图多元统计分析地理信息系统工作空间 GeoExpl

Research on Marketing System of Railway Freight Oriented by Customer Value

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Research on Marketing System of Railway Freight Oriented by ...