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Resistivity-Temperature Behavior of CB-Filled HDPE Foaming Composites

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Chemical Research in Chinese Universities 2008年第2期24卷 215-219页

作者： LI Ji-xin ZHANG Guo LI Zhuo-shi WANG xin-lei LIU Xiu-qi Key Laboratory of Automobile Materials Ministry of Education College of Materials Science and Engineering Jilin University Changchun 130012 P. R. China Petrochemical Engineering School Shenyang University of Technology Liaoyang Campus Liaoyang 111003 P R. China

High-density polyethylene/carbon black foaming conductive composites were prepared from acetylene black（ACEY） and super conductive carbon black（HG-1P） as conductive filler, low-density polyethylene（LDPE） as the second component, ethylene-vinyl acetate（EVA） and ethylene propylene rubber（EPR） as the third component, azobisformamide（AC） as foamer, and dicumyl peroxide（DCP） as cross-linker. The structure and resistivity-temperature behavior of high-density polyethylene（HDPE）/CB foaming conductive composites were investigated. Influences of carbon black, LDPE, EVA, EPR, AC, and DCP on the foaming performance and resistivity-temperature behavior of HDPE/CB foaming conductive composites were also studied. The results reveal that HDPE/CB foaming conductive composite exhibits better switching characteristic; ACET-filled HDPE foaming conductive composite displays better positive temperature coefficient（PYC） effect; whereas super conductive carbon black（HG-1P）-filled HDPE foaming conductive composite shows better negative temperature coefficient（NTC） effect.

关键词： Resistivity-temperature behavior Carbon black High-density polyethylene Foam Positive temperaturecoefficient(PYC) effect Negative temperature coefficient(NYC) effect

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罕见高温干旱对杨梅生长影响的研究

江西农业学报 2024年第1期36卷 102-106页

作者：黄新朱寿燕廖必军陈鑫磊韦颖慈溪市气象局浙江慈溪315300 仙居县气象局浙江仙居317300 浙江蓝天气象科技有限公司浙江杭州310017 中国太平洋财产保险股份有限公司宁波分公司浙江宁波315300

分析了浙江省慈溪市2022/2023年度杨梅生育期的温、光、水等气象条件,尤其是2022年盛夏罕见的高温干旱和后续天气对杨梅生长发育的持续影响,结果表明:盛夏罕见的高温干旱不仅会导致杨梅叶片大面积卷曲、萎蔫,以及当年移栽的杨梅幼树大... 详细信息

分析了浙江省慈溪市2022/2023年度杨梅生育期的温、光、水等气象条件,尤其是2022年盛夏罕见的高温干旱和后续天气对杨梅生长发育的持续影响,结果表明:盛夏罕见的高温干旱不仅会导致杨梅叶片大面积卷曲、萎蔫,以及当年移栽的杨梅幼树大量枯死,而且还严重抑制了夏梢的抽发生长和花芽分化;在旱情解除后,秋梢的大量抽发进一步影响了花芽分化和养分积累,导致花芽发育较弱,并形成了大量秋梢果;采收后期若遇高温,秋梢果则会大量变软或脱落。因此,提出了一些能有效防御高温干旱对杨梅影响的对策措施。

关键词：杨梅浙江高温干旱对策生长

Reduced-order output feedback controllers for the robust H^(∞) performance problem

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Chinese Science Bulletin 1997年第6期42卷 517-522页

作者： GUO lei, xin xin and FENG ChunboRescarch Institute of Automation, Southeast University, Nanjing 210096, China Research Institute of Automation Southeast University Nanjing China

OVER the last decade, the H~∞ control has been recognized as one of the most effective tools for robust control. A lot of researches have been devoted to robust H~∞ problems for uncertain systems. Recently, Zhou et al., presented the notion of strongly robust H~∞ performance, which is an extension of quadratic stability and equivalent to robust H~∞ problem. However. only state-feedback controllers were discussed.

关键词： robust control H∞ control matrix inequality reduced-order controller.

水电站Q345压力钢管爆破模型设计和三维有限元计算分析

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水电站机电技术 2024年第9期47卷 113-115,142页

作者：张学俊刘锡麟雷彬馨中国水利水电第十四工程局有限公司云南昆明650041

为满足压力钢管在各种环境下的应用,需要进行不同的焊接方式和不同的坡口的设计,利用有限元分析出爆破压力,由此来试验各种焊缝性能。本文以实际项目为背景,利用SolidWorks设计建立模型,导入ANSYS进行整体受力分析,最后得到压力钢管的... 详细信息

为满足压力钢管在各种环境下的应用,需要进行不同的焊接方式和不同的坡口的设计,利用有限元分析出爆破压力,由此来试验各种焊缝性能。本文以实际项目为背景,利用SolidWorks设计建立模型,导入ANSYS进行整体受力分析,最后得到压力钢管的受力情况,分析出压力钢管爆破压力值。

关键词：压力钢管 ANSYS 受力分析有限元爆破

Emission characteristics of flue gas during the chemical-looping combustion process for multi-component solid waste

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Clean Energy 2022年第6期6卷 840-847页

作者： Jiang-Bo Qian xin-lei Wang Jin-xing Wang Department of Power Engineering North China Electric Power UniversityBaoding 071003HebeiChina Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology North China Electric Power UniversityBaoding 071003HebeiChina

Solid waste has interactions with its flue-gas products during combustion,which offers the possibility of regulating its pollutant ***,these interaction pathways would be clearer under anaerobic conditions when the chemical-looping combus-tion(CLC)process is *** CLC experiments of multi-component solid waste were conducted on a homemade twin-bed reactor and the characteristics of flue gas were investigated for the effect of the mixing ratio of sewage sludge and polyvinyl chloride(PVC).The results indicated that the combustion efficiency was>99.9%for these CLC processes;the highest carbon-conversion rate was obtained at 96.3%for PVC with 60%*** highest NO and SO_(2)emissions were 26%and 19%,respectively,when the sludge was mixed with 20%*** the proportion of PVC blended into the sludge increased,the time when the concentration of NO in the flue-gas peaks moved backwards,while peak SO_(2)concentration moved *** general trend was to increase first and then *** addition,there were multiple peaks in carbon emissions,corresponding to~10%,30%and~70%of the carbon-conversion rate;nitrogen emissions reached 90%of total emissions before the carbon-conversion rate was 40%;sulphur emissions had a longer cycle and were mainly emitted between 10%and 60%of the carbon-conversion *** results are expected to provide a reference for solid-waste source suppressing to inhibit the generation of pollutants.

关键词： chemical-looping combustion(CLC) flue-gas products solid waste mixing ratio

Ultra-high-energy lithium-ion batteries enabled by aligned structured thick electrode design

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Rare Metals 2022年第1期41卷 14-20页

作者： Chao-Chao Zhou Zhi Su xin-lei Gao Rui Cao Shi-Chun Yang xin-Hua Liu College of Chemistry and Chemical Engineering Xinjiang Normal UniversityUrumqi 830054China School of Transportation Science and Engineering Beihang UniversityBeijing 100191China Dyson School of Design Engineering Imperial College LondonSouth Kensington CampusLondon SW72AZUK

Battery manufacturing holds great promise to build highperformance electrodes with fine-controlled microstructure,geometry and ***,thick electrodes face concomitant challenge of the sluggish transport of both electrons and Li ***,we present a thick electrode with an aligned structure,as an alternative to achieve high-energy lithium-ion *** freeze-drying process with the aid of gum binder and single-walled carbon nanotubes(SWCNT)is originally developed for preparing the LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2))(NCM811)-based aligned structured thick electrode as the representative cathode electrode *** 1-mm-thick cathode with mass loading of 101 mg·cm^(-2) achieves a high specific capacity of 203.4 mAh·g^(-1).Moreover,the as-prepared ultra-thick electrodes with a high mass loading of 538 mg·cm^(-2) and high active material content of 99.5 wt%are successfully demonstrated,delivering an extremely high areal capacity of 93.4 mAh·cm^(-2),which represents a>30-times improvement compared to that of the commercial *** design opens an effective avenue for greener,scalable and sustainable manufacturing processes toward energy storage devices and other related practical applications.

关键词： Battery electrode lithium

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原位合成锆酸钙对镁锆材料性能的影响

冶金能源 2024年第2期43卷 25-29页

作者：谷安琦郑胜利金梓萱曹钟月雷鑫吴锋辽宁科技大学材料与冶金学院

为了研究原位合成锆酸钙对镁锆材料性能的影响,将碳酸钙和脱硅锆(合计加入量分别为10%、20%和30%)与电熔镁砂混合、成型、烘干后,分别于1 600、1 700℃保温3 h煅烧。检测烧后试样的体积密度、显气孔率、烧后线变化率、常温耐压强度、抗... 详细信息

为了研究原位合成锆酸钙对镁锆材料性能的影响,将碳酸钙和脱硅锆(合计加入量分别为10%、20%和30%)与电熔镁砂混合、成型、烘干后,分别于1 600、1 700℃保温3 h煅烧。检测烧后试样的体积密度、显气孔率、烧后线变化率、常温耐压强度、抗热震性、抗渣性,并分析试样的物相组成。结果表明:在同一煅烧温度时,随着锆钙合量增加,烧后试样的体积密度和常温耐压强度逐渐减小,显气孔率和线收缩率逐渐增大;在同一锆钙合量时,随着锻烧温度的升高,烧后试样的体积密度、线收缩率和常温耐压强度逐渐增大,显气孔率逐渐降低;当煅烧温度为1 600℃、锆钙合量为10%时,试样的抗热震性最好;当煅烧温度为1 700℃、锆钙合量为10%时,试样的抗渣性最优。

关键词：原位合成锆酸钙镁锆材料

Numerical simulation of hydraulic fracture propagation in tight oil reservoirs by volumetric fracturing

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Petroleum Science 2015年第4期12卷 674-682页

作者： Shi-Cheng Zhang xin lei Yu-Shi Zhou Guo-Qing Xu College of Petroleum Engineering University of Petroleum

Volumetric fracturing is a primary stimulation technology for economical and effective exploitation of tight oil reservoirs. The main mechanism is to connect natural fractures to generate a fracture network system which can enhance the stimulated reservoir volume. By using the combined finite and discrete element method, a model was built to describe hydraulic fracture propagation in tight oil reservoirs. Considering the effect of horizontal stress difference, number and spacing of perforation clus- ters, injection rate, and the density of natural fractures on fracture propagation, we used this model to simulate the fracture propagation in a tight formation of a certain oil- field. Simulation results show that when the horizontal stress difference is lower than 5 MPa, it is beneficial to form a complex fracture network system. If the horizontal stress difference is higher than 6 MPa, it is easy to form a planar fracture system; with high horizontal stress differ- ence, increasing the number of perforation clusters is beneficial to open and connect more natural fractures, and to improve the complexity of fracture network and the stimulated reservoir volume （SRV）. As the injection rate increases, the effect of volumetric fracturing may be improved; the density of natural fractures may only have a great influence on the effect of volume stimulation in a low horizontal stress difference.

关键词： Tight oil reservoir Volumetric fracturingFracture propagation Horizontal stress difference Stimulated reservoir volume

基于文献计量的全球胶囊内镜研究特征与趋势分析

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中华消化内镜杂志 2024年第8期41卷 647-653页

作者：郝美娟高野程志远辛磊廖专李兆申王洛伟上海理工大学健康科学与工程学院上海200433 贵阳市第四人民医院麻醉手术科贵阳550000 海军军医大学第一附属医院消化内科上海200433 上海交通大学医学院附属第一人民医院消化内科上海200080

目的通过对胶囊内镜领域国际国内发表论文的特征与关键词进行定量分析,阐明胶囊内镜研究发展趋势,为相关研究者提供参考。方法采用文献计量学方法,分别使用Stork文献鸟和CiteSpace可视化工具对PubMed英文数据库和CNKI中文数据库中关于... 详细信息

目的通过对胶囊内镜领域国际国内发表论文的特征与关键词进行定量分析,阐明胶囊内镜研究发展趋势,为相关研究者提供参考。方法采用文献计量学方法,分别使用Stork文献鸟和CiteSpace可视化工具对PubMed英文数据库和CNKI中文数据库中关于“胶囊内镜”的所有发表于2002年至2022年的文献进行检索并分析。结果在此时间段PubMed数据库中共检出6011篇胶囊内镜相关文献,国内外英文论文发表数量和被引频次均呈现上升趋势,全球和国内英文论文的增长率分别为5%和15%。文献发表国家主要集中于美国、日本、中国、意大利和德国。全球研究领域集中于磁控胶囊内镜、结肠胶囊内镜、炎症性肠病、小肠胶囊内镜、胶囊内镜图像、不明原因消化道出血等方向。CNKI数据库中共检索出2027篇文献,研究机构前3名依次为海军军医大学长海医院消化内科、南方医科大学南方医院消化内科、上海交通大学电子信息与电气工程学院,近期最新突现词为人工智能、深度学习、指南。结论目前胶囊内镜领域研究活跃度逐渐增加,我国在国际胶囊内镜领域具有一定学术影响力。

关键词：胶囊内窥镜文献计量学关键词检索趋势分析