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Low-frequency damping behavior of closed-cell Mg alloy foams reinforced with SiC particles

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International Journal of Minerals,Metallurgy and Materials 2017年第6期24卷 701-707页

作者： Wen-zhan Huang hong-jie luo Yong-liang Mu Hao Lin Hao Du School of Metallurgy Northeastern University Shenyang 110819 China Engineering Research Center of the Ministry of Education for Advanced Materials Preparation Technology Shenyang 110819 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The damping properties of an Mg alloy foam and its composite foams were investigated using a dynamic mechanical thermal analyzer. The results show that the loss factors of both the Mg alloy and its composite foams are insensitive to temperature and loading frequency when the temperature is less than a critical temperature Tcrit. However, it increases when the temperature exceeds the Tcrit values, which are 200 and 250°C for the Mg alloy foam and the Mg alloy/SiCp composite foams, respectively. The Mg alloy/SiCp composite foams exhibit a higher damping capacity than the Mg alloy foam when the temperature is below 200°C. By contrast, the Mg alloy foam exhibits a better damping capacity when the temperature exceeds 250°C. The variation in the damping capacity is attributed to differences in the internal friction sources, such as the characteristics of the matrix material, abundant interfaces, and interfacial slipping caused by SiC particles, as well as to macrodefects in the Mg alloy and its composite foams.

关键词： magnesium alloys foams silicon carbide damping

Dynamic Compressive Property of Closed-Cell Mg Alloy Composite Foams Reinforced with SiC Particles

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Acta Metallurgica Sinica(English Letters) 2019年第11期32卷 1320-1328页

作者： Wen-Zhan Huang hong-jie luo Yong-Liang Mu Jian-Rong Xu Ai-Chun Zhao School of Metallurgy Northeastern UniversityShenyang 110819China Engineering Research Center of Ministry of Education for Advanced Materials Preparation Technology Shenyang 110819China School of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China

The high-strain-rate mechanical response of Mg alloy/SiC_p composite foams has received increased attention in recent years due to their light weight and potential to absorb large amounts of energy during deformation. Dynamic compressive properties of closed-cell Mg alloy/SiC_p composite foams with diff erent relative densities(0.162, 0.227 and 0.351) and diff erent SiC_p additions(0, 4 and 8 wt%) have been investigated using Split-Hopkinson pressure bar. It is shown that peak stress and energy absorption capacity signifi cantly increase as the relative density increases at the range of testing strain rates. Peak stress and energy absorption display strain rate dependence. The peak stress of specimens with 0 wt% and 4 wt% SiC particles additions grows with increasing strain rate. Meanwhile, the increment in the peak stress of specimens with 8 wt% addition is not signifi cant with strain rate increasing. The increase in strain rate increases the energy absorption capacity. The suitable amount of SiC particles addition has great advantages over increasing the peak stress and energy absorption capacity at the high strain rate. The strain-rate-sensitive matrix, cell morphology, morphological defects and gas pressure have an impact on the strain-rate sensitivity of Mg alloy/SiC_p composite foams.

关键词： Mg alloy SiC particles Mg alloy/SiC_p composite foam Split-Hopkinson pressure bar system(SHPB) Dynamic compressive

High catalytic activity for formaldehyde oxidation of an interconnected network structure composed of δ-MnO_(2) nanosheets and γ-MnOOH nanowires

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Advances in Manufacturing 2020年第4期8卷 429-439页

作者： Ying Tao Rong Li Ai-Bin Huang Yi-Ning Ma Shi-Dong Ji Ping Jin hong-jie luo State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050.People's Republic of China Institute for the Conservation of Culture Heritage Shanghai UniversityShanghai 200444.People's Republic of China University of Chinese Academy of Sciences Beijing 100049People's Republic of China Department of Criminal Science and Technology Jiangsu Police InstituteNanjing 210031People's Republic of China

Among the transition metal oxide catalysts,manganese oxides have great potential for formaldehyde(HCHO)oxidation at ambient temperature because of their high activity,nontoxicity,low cost,and polybasic *** this work,a MnO_(2)-based catalyst(M-MnO_(2))with an interconnected network structure was successfully synthesized by a one-step hydrothermal *** M-MnO_(2) catalyst was composed of the main catalytic agent,δ-MnO_(2) nanosheets,dispersed in a nonactive framework material of γ-MnOOH *** catalytic activity of M-MnO_(2) for HCHO oxidation at room temperature was much higher than that of the pure δ-MnO_(2) *** is attributed to the special interconnected network *** special interconnected network structure has high dispersion and specific surface area,which can provide more surface active oxygen species and higher surface hydroxyl groups to realize rapid decomposition of HCHO.

关键词： MnO_(2) Formaldehyde Catalytic oxidation Hydrothermal synthesis

Review on thermochromic vanadium dioxide based smart coatings： from lab to commercial application

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Advances in Manufacturing 2018年第1期6卷 1-19页

作者： Tian-Ci Chang Xun Cao Shan-Hu Bao Shi-Dong Ji hong-jie luo Ping Jin State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of Sciences Shanghai 200050 People'sRepublic of China Research Center for Industrial Ceramics Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200050 People's Republic of China University of Chinese Academy of Sciences Beijing 100049People's Republic of China School of Materials Science and Engineering ShanghaiUniversity Shanghai 200444 People's Republic of China National Institute of Advanced Industrial Science andTechnology (AIST) Moriyama Nagoya 463-8560 Japan

With an urgent demand of energy efficientcoatings for building fenestrations, vanadium dioxide（VO2）-based thermochromic smart coatings have beenwidely investigated due to the reversible phase transition ofVO2 at a critical transition temperature of 68 ℃, which isaccompanied by the modulation of solar irradiation, espe-cially in the near-infrared region. As for commercialapplications in our daily life, there are still some obstaclesfor VO2-based smart coatings, such as the high phasetransition temperature, optical properties （luminous trans-mittance and solar modulation ability）, environmental sta-bility in a long-time period, as well as mass production. Inthis review, recent progress of thermochromic smart coat-ings to solve above obstacles has been surveyed. Mean-while, future development trends have also been given topromote the goal of commercial production of VO2 smartcoatings.

关键词： Vanadium dioxide (V02) Thermochromic Multilayer films Nanoparticles Commercial production

水稻与雍菜间作对水稻生长、产量和病虫害控制的影响

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生态学杂志 2017年第10期36卷 2866-2873页

作者：宁川川陈权洋胡洪婕骆世明蔡昆争华南农业大学资源环境学院广州510642 农业部华南热带农业环境重点实验室广州510642

间作是一种高效利用光、热、水、土资源的优良作物种植方式,但是以往间作研究大多集中在旱地作物。本研究在水田条件下,通过连续两年(2014—2015)四季的大田试验,研究水稻与雍菜不同比例间作对水稻生长发育、物质积累、病虫害防控及产... 详细信息

间作是一种高效利用光、热、水、土资源的优良作物种植方式,但是以往间作研究大多集中在旱地作物。本研究在水田条件下,通过连续两年(2014—2015)四季的大田试验,研究水稻与雍菜不同比例间作对水稻生长发育、物质积累、病虫害防控及产量的影响。试验包括5个处理,即水稻单作、雍菜单作和3种比例的水稻与雍菜间作(2∶2,3∶2,4∶2)。结果表明:水稻和雍菜间作对水稻株高和叶绿素含量没有影响,显著增加水稻的分蘖数和地上部生物量,且随着水稻行数比例的减少而增加;与水稻单作相比,间作显著提高水稻单位面积的产量,增产优势表现为2∶2间作>3∶2间作>4∶2间作,产量的提高主要通过增加有效穗数和总粒数,甚至提高结实率来实现;间作还能有效减轻水稻纹枯病和稻纵卷叶螟的危害程度,其中对纹枯病的控制效果为39.8%~68.8%,卷叶螟为36.7%~56.0%。研究表明,水稻与雍菜间作是一种可行的利用生物多样性控制病虫害且增加作物产量的生态农业模式。

关键词：水稻雍菜间作产量病虫害

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深海地热探针控制系统设计与实现

海洋技术学报 2016年第6期35卷 72-76页

作者：吕九红刘颉罗玉玺国家海洋技术中心天津300112

介绍了一种原位测量深海地热探针的控制系统设计方法。描述了探针控制系统总体设计思路,采用分散与集中相结合的控制策略,合理安排了控制任务,优化了控制系统设计;介绍了测温部件的优化设计方法,给出了系统控制电路与软件的设计方法和... 详细信息

介绍了一种原位测量深海地热探针的控制系统设计方法。描述了探针控制系统总体设计思路,采用分散与集中相结合的控制策略,合理安排了控制任务,优化了控制系统设计;介绍了测温部件的优化设计方法,给出了系统控制电路与软件的设计方法和系统控制流程;介绍了操作软件的设计要点,对软件设计过程中的关键点给出较详细说明;最后进行了系统整体测试,验证了系统设计的可行性和稳定性。

关键词：地热探针海底原位测量温度变送器分散与集中结合的控制系统

腹腔镜胆总管探查取石术治疗复杂性肝内胆管结石的效果及对血清炎症因子的影响

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中国内镜杂志 2022年第8期28卷 41-46页

作者：刘东亮罗红杰季春勇郑州大学附属郑州中心医院肝胆胰微创外科河南郑州450000

目的分析腹腔镜胆总管探查取石术治疗复杂性肝内胆管结石的临床价值。方法选取2018年2月-2020年2月该院复杂性肝内胆管结石患者106例,随机分为常规组(n=53)和治疗组(n=53),治疗组接受腹腔镜胆总管探查取石术,常规组接受传统开腹胆总管... 详细信息

目的分析腹腔镜胆总管探查取石术治疗复杂性肝内胆管结石的临床价值。方法选取2018年2月-2020年2月该院复杂性肝内胆管结石患者106例,随机分为常规组(n=53)和治疗组(n=53),治疗组接受腹腔镜胆总管探查取石术,常规组接受传统开腹胆总管探查取石术。比较两组患者治疗后的手术效果、炎症因子水平、并发症发生率、结石复发率和生活质量评分。结果治疗组肛门恢复排气时间、住院时间和手术时间均明显短于常规组,术中出血量明显少于常规组(P<0.05)。术后3 d,C反应蛋白(CRP)、肿瘤坏死因子-α(TNF-α)、白细胞介素-6(IL-6)和白细胞介素-1(IL-1)水平明显低于常规组(P<0.05)。治疗组并发症发生率和结石复发率明显低于常规组(P<0.05),生活质量评分明显高于常规组(P<0.05)。结论采用腹腔镜胆总管探查取石术治疗肝内胆管结石,不仅可以提高治疗效果,降低结石复发率,还抑制炎性因子释放,促进机体恢复。

关键词：复杂性肝内胆管结石腹腔镜手术胆总管探查取石术炎症因子并发症生活质量

An Automatic Classification Pipeline for the Complex Synaptic Structure Based on Deep Learning

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Journal of Systems Science & Complexity 2022年第4期35卷 1398-1414页

作者： SHEN Lijun MA Chao luo jie hong Bei Faculty of Information Technology Macao University of Science and TechnologyMacaoTaipai999078China Faculty of Mathematics and Statistics Hubei UniversityWuhan430062China

As a hallmark of brain complexity,synapses in the nervous system have always received extensive *** diversity of the synaptic structure reflects various functions and mechanisms,some research indicates that,as one of the complex synaptic structures,multiple synapses can strengthen the synaptic connection,what’s more,it is closely associated with the procedure of memory and *** by the fast advancement of electron microscopy(EM)technology,it is possible to detect the composition of multiple synapse with high *** this basis,there have been various meaningful studies concerning the relationship between the multiple synapse and cognitive *** the extensive studies have been made by different researchers on multiple synapse,no attention has been paid to the classification accuracy of the type of multiple *** current research puts forward an effective method for the automatic classification of multiple synapse,which should be performed in three steps,namely the segmentation of synaptic clefts,the segmentation of vesicle bands,as well as the segmentation of multiple *** to experimental results based on four data sets,the mean classification rate of the method is approximately 97%.In addition,the experimental result on the public dataset shows that the accuracy can reach 96.5%.The classification results provide a basis for quantitative statistics of follow-up ***,this automatic classification method can reduce the time in artificial statistics,and thus researchers can focus more attention on the analysis of statistical results.

关键词： Classification deep learning electron microscopy multiple synapses synaptic cleft vesicle band

数字经济赋能养老服务业跨越“低水平均衡陷阱”

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河北学刊 2025年第1期45卷 152-161页

作者：夏杰长罗敬蔚中国社会科学院财经战略研究院中央财经大学法学院

中国养老服务业正面临低水平需求与高成本供给之间的矛盾,这直接导致养老服务业陷入“低水平均衡陷阱”。数字经济在优化养老资源配置、降低养老服务成本和完善养老生态系统等方面发挥了重要作用,是跨越养老服务业“低水平均衡陷阱”的... 详细信息

中国养老服务业正面临低水平需求与高成本供给之间的矛盾,这直接导致养老服务业陷入“低水平均衡陷阱”。数字经济在优化养老资源配置、降低养老服务成本和完善养老生态系统等方面发挥了重要作用,是跨越养老服务业“低水平均衡陷阱”的重要力量。借力数字经济推动养老服务实现高水平均衡,进而实现养老服务业高质量发展,需要综合施策:适当延长老年群体工作年限;对老年人口进行数字技术培训,助力他们跨越数字鸿沟;利用数字技术优化养老服务的资源配置;多渠道降低养老服务业成本;提升从业人员数字素养。

关键词： “低水平均衡陷阱” 老龄化数字经济养老服务业