检索结果-南通市图书馆

Flexible coal-derived carbon fibers via electrospinning for self-standing lithium-ion battery anodes

在线全文

学校读者我要写书评

暂无评论

International Journal of mining Science and Technology 2024年第12期 1753-1763页

作者： Baolin Xing Weibo Meng Hao Liang Weiwei Kang Huihui Zeng Chuanxiang Zhang Ishioma Laurene Egun Peng Li Yijun Cao Zhengfei Chen Henan International Joint laboratory of Coal Clean Utilization College of Chemistry and Chemical Engineering Henan Polytechnic University state Collaborative Innovation Center of Coal Work Safety and Clean-Efficiency Utilization School of Biological and Chemical Engineering NingboTech University Henan Province Industrial Technology Research Institute of Resources and Materials Zhengzhou University

A series of flexible and self-standing coal-derived carbon fibers （CCFs） were fabricated through electrospinning coupled with carbonization using bituminous coal and polyacrylonitrile （PAN） as the carbon *** CCFs were utilized as free-standing lithium-ion battery （LIB） *** carbonization temperature reveals that the CCFs exhibit a one-dimensional solid linear structure with a uniform distribution of graphite-like *** fibers possess a dense structure and smooth surface,with averaging diameter from approximately 125.0 to 210.0 nm at carbonization temperatures ranging from 600 to 900°*** electrospinning and carbonization,the aromatic rings enriched in bituminous coal crosslink with PAN chains,forming a robust three-dimensional （3D） ***3D microstructure significantly enhances the flexibility and tensile strength of CCFs,while increasing the graphite-like sp2microcrystalline carbon content,thus improving electrical *** CCFs carbonized at 700°C demonstrate an optimal balance of sp3amorphous and sp2graphite-like *** average diameter of CCFs-700 is 177 nm and the specific surface area （SSA） is 7.2 m2·***,the fibers contain oxygen-containing functional groups,as well as nitrogen-containing functional groups,including pyridinic nitrogen and pyrrolic *** to its characteristics,the CCFs-700 showcases remarkable electrochemical performance,delivering a high reversible capacity of 631.4 m Ah·***-700 also exhibit outstanding cycle stability,which retains approximately all of their first capacity (400.1 mAh·g-1) after 120 *** research offers an economical yet scalable approach for producing flexible and self-supporting anodes for LIBs that do not require current collectors,binders and conductive additives,thereby simplifying the electrode fabrication process.

关键词：

Implicit Modality mining: An End-to-End Method for Multimodal Information Extraction

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Electronic Research and Application 2024年第2期8卷 124-139页

作者： Jinle Lu Qinglang Guo School of Cyber Science and Technology University of Science and Technology of ChinaHefei 230027Anhui ProvinceChina National Engineering Research Center for Public Safety Risk Perception and control by Big Data(RPP) CETC Academy of Electronics and Information Technology Group Co.Ltd.China Academic of Electronics and Information TechnologyBeijing 100041China

Multimodal named entity recognition(MNER)and relation extraction(MRE)are key in social media analysis but face challenges like inefficient visual processing and non-optimal modality interaction.(1)Heavy visual embedding:the process of visual embedding is both time and computationally expensive due to the prerequisite extraction of explicit visual cues from the original image before input into the multimodal ***,these approaches cannot achieve efficient online reasoning;(2)suboptimal interaction handling:the prevalent method of managing interaction between different modalities typically relies on the alternation of self-attention and cross-attention mechanisms or excessive dependence on the gating *** explicit modeling method may fail to capture some nuanced relations between image and text,ultimately undermining the model’s capability to extract optimal *** address these challenges,we introduce Implicit Modality mining(IMM),a novel end-to-end framework for fine-grained image-text correlation without heavy visual *** uses an Implicit Semantic Alignment module with a Transformer for cross-modal clues and an Insert-Activation module to effectively utilize these *** approach achieves state-of-the-art performance on three datasets.

关键词： Multimodal Named entity recognition Relation extraction Patch projection

Phylogenomic mining of the Mints Reveals Multiple Mechanisms Contributing to the Evolution of Chemical Diversity in Lamiaceae

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2018年第8期11卷 1084-1096页

作者： Mint Evolutionary Genomics Consortium Department of Biochemistry Purdue University West Lafayette IN 47907-2063 USA Department of Plant Biology Michigan State University East Lansing MI 48824 USA Florida Museum of Natural History University of Florida Gainesville FL 32611 USA The John Innes Centre Department of Biological Chemistry Norwich NR4 7UH UK Department of Biology University of Florida Gainesville FL 32611 USA

The evolution of chemical complexity has been a major driver of plant diversification, with novel compounds serving as key innovations. The species-rich mint family （Lamiaceae） produces an enormous variety of compounds that act as attractants and defense molecules in nature and are used widely by humans as flavor additives, fragrances, and anti-herbivory agents. To elucidate the mechanisms by which such diversity evolved, we combined leaf transcriptome data from 48 Lamiaceae species and four outgroups with a robust phylogeny and chemical analyses of three terpenoid classes （monoterpenes, sesquiterpenes, and iridoids） that share and compete for precursors. Our integrated chemical-genomic-phylogenetic approach revealed that：（1） gene family expansion rather than increased enzyme promiscuity of terpene synthases is correlated with mono- and sesquiterpene diversity; （2） differential expression of core genes within the iri- doid biosynthetic pathway is associated with iridoid presence/absence; （3） generally, production of iridoids and canonical monoterpenes appears to be inversely correlated; and （4） iridoid biosynthesis is significantly associated with expression of geraniol synthase, which diverts metabolic flux away from canonical mono- terpenes, suggesting that competition for common precursors can be a central control point in specialized metabolism. These results suggest that multiple mechanisms contributed to the evolution of chemodiversity in this economically important family.

关键词： chemodiversity evolution terpene iridoid

Plasmon-assisted optical trapping and anti-trapping

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2016年第1期5卷 52-57页

作者： Aliaksandra Ivinskaya Mihail I Petrov Andrey A Bogdanov Ivan Shishkin Pavel Ginzburg Alexander S Shalin Department of Nanophotonics and Metamaterials ITMO UniversityBirzhevaja Line14199034 St PetersburgRussia School of Electrical Engineering Tel Aviv UniversityRamat AvivTel Aviv 69978Israel Kotel’nikov Institute of Radio Engineering and Electronics of Russian Academy of Sciences(Ulyanovsk branch) Goncharova Street 48/2432071 UlyanovskRussia Ulyanovsk state University Lev Tolstoy Street 42432017 UlyanovskRussia

The ability to manipulate small objects with focused laser beams has opened a venue for investigating dynamical phenomena relevant to both fundamental and applied *** and plasmonic structures enable superior performance in optical trapping via highly confined *** this case,the interplay between the excitation field,re-scattered fields and the eigenmodes of a structure can lead to remarkable effects;one such effect,as reported here,is particle trapping by laser light in a vicinity of metal *** plasmon excitation at the metal substrate plays a key role in tailoring the optical forces acting on a nearby *** on whether the illuminating Gaussian beam is focused above or below the metal-dielectric interface,an order-of-magnitude enhancement or reduction of the trap stiffness is achieved compared with that of standard glass ***,a novel plasmon-assisted anti-trapping effect(particle repulsion from the beam axis)is predicted and studied.A highly accurate particle sorting scheme based on the new anti-trapping effect is *** ability to distinguish and configure various electromagnetic channels through the developed analytical theory provides guidelines for designing auxiliary nanostructures and achieving ultimate control over mechanical motion at the microand nano-scales.

关键词： Gaussian beam green’s function optical forces optical tweezers surface plasmon

The integrated monitoring system for running parameters of key mining equipment based on condition monitoring technology

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Coal Science & Engineering(China) 2010年第1期16卷 108-112页

作者： BIN Guang-fu LI Xue-jun BALBIR S Dhillon HUANG Zhen-yu GUO Deng-ta key Lab of Health Maintenance for Mechanical Equipment of Hunan Province Hunan University of Science and Technology Xiangtan 411201 China Department of Mechanical Eng. Univ/Ottawa Ottawa K1B 6N5 Canada Xiangtan Liangchuan Coal Mine Machine Co. Ltd. Xiangtan 411104 China Xiangtan Electric Manufacturing Corporation Ltd. Xiangtan 411101 China

An integrated monitoring system for running parameters of key mining equipmenton the basis of condition monitoring technology and modern communication networktechnology was *** system consists of a client computer with functions ofsignal acquisition and processing, and a host computer in the central control *** acquisition module of the client computer can collect the running parameters fromvarious monitoring terminals in *** DSP high-speed data processing system ofthe main control module can quickly achieve the numerical calculation for the *** signal modulation and signal demodulation are completed by the frequencyshift keying circuit and phase-locked loop frequency circuit, ***, the signalis sent to the host computer for logic estimation and diagnostic analysis using the networkcommunication technology, which is helpful for technicians and managers to control therunning state of equipment.

关键词： mining key equipment running parameters condition monitoring signal acquisition and processing integrated monitoring

在线全文

学校读者我要写书评

暂无评论

沿空留巷巷旁充填体稳定性控制技术研究

煤炭科学技术 2019年第9期47卷 273-278页

作者：陈勇孟宁康杨玉贵郝胜鹏中国矿业大学煤炭资源与安全开采国家重点实验室江苏徐州221116 中国矿业大学深部岩土力学与地下工程国家重点实验室江苏徐州221116 Polytechnique Montreal CivilGeological and Mining EngineeringQuebec CanadaH3C3A7

充填体稳定性控制是沿空留巷成功的关键因素之一。为获得合理的充填体稳定性控制技术,以三河尖煤矿7136工作面千米深井沿空留巷为工程背景,采用UDEC6.0的Trigon模型校正了巷旁充填体(高水材料水灰比为1.5∶1.0)的数值模型,然后对充填体... 详细信息

充填体稳定性控制是沿空留巷成功的关键因素之一。为获得合理的充填体稳定性控制技术,以三河尖煤矿7136工作面千米深井沿空留巷为工程背景,采用UDEC6.0的Trigon模型校正了巷旁充填体(高水材料水灰比为1.5∶1.0)的数值模型,然后对充填体稳定控制的钢筋梯子梁直径、对拉锚杆直径及数量不同时的充填体应力应变进行了模拟分析。研究结果表明:充填体的加固作用可有效约束充填体表面位移,综合提升充填体的承载能力可达20%以上,提高了沿空留巷充填体的稳定性,特别是增加对拉锚杆直径和数量在大变形的条件下可有效控制充填体帮部的整体横向变形和鼓包现象,是提高充填体加固系统护表能力、充填体承载能力的重要参数之一。研究成果成功应用于千米深井沿空留巷,加固后的充填体帮平均变形不超过150mm,顶板下沉量不超过250mm,表明充填体加固系统可靠,而且具有良好的适应性。

关键词：沿空留巷充填体对拉锚杆钢筋梯子梁

Dielectric barrier discharge-based defect engineering method to assist flash sintering

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2023年第5期12卷 1046-1057页

作者： Xinhao Zhao Nianping Yan Yueji Li Zikui Shen Rongxia Huang Chen Xu Xuetong Zhao Xilin Wang Ruobing Zhang Zhidong Jia Guangdong Engineering Technology Research Center of Power Equipment Reliability in Complicated Coastal Environments Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China state Grid Jiangxi Electric Power Research Institute Nanchang 330096China School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China Institute of Materials China Academy of Engineering PhysicsMianyang 621907China fSchool of Electrical Engineering Chongqing UniversityChongqing 400044China

Oxygen vacancy OV plays an important role in a flash sintering (FS) process. In defect engineering, the methods of creating oxygen vacancy defects include doping, heating, and etching, and all of them often have complex processes or equipment. In this study, we used dielectric barrier discharge (DBD) as a new defect engineering technology to increase oxygen vacancy concentrations of green billets with different ceramics (ZnO, TiO_(2), and 3 mol% yttria-stabilized zirconia (3YSZ)). With an alternating current (AC) power supply of 10 kHz, low-temperature plasma was generated, and a specimen could be treated in different atmospheres. The effect of the DBD treatment was influenced by atmosphere, treatment time, and voltage amplitude of the power supply. After the DBD treatment, the oxygen vacancy defect concentration in ZnO samples increased significantly, and a resistance test showed that conductivity of the samples increased by 2–3 orders of magnitude. Moreover, the onset electric field (E) of ZnO FS decreased from 5.17 to 0.86 kV/cm at room temperature (RT);while in the whole FS, the max power dissipation decreased from 563.17 to 27.94 W. The defect concentration and conductivity of the green billets for TiO_(2) and 3YSZ were also changed by the DBD, and then the FS process was modified. It is a new technology to treat the green billet of ceramics in very short time, applicable to other ceramics, and beneficial to regulate the FS process.

关键词： flash sintering(FS) ZnO dielectric barrier discharge(DBD) oxygen vacancy OV defect engineering

基于显微CT扫描和统计强度的煤岩损伤破裂特性研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

煤炭科学技术 2023年第S02期51卷 1-12页

作者：张良齐庆新 REN Ting 李祥春高科李春元李晓鹏袁红辉煤炭科学研究总院有限公司深部开采与冲击地压防治研究院北京100013 河南省瓦斯地质与治理重点实验室——省部共建国家重点实验室培育基地河南焦作454000 煤炭资源高效开采与洁净利用国家重点实验室北京100013 School of Civil Mining and Environmental EngineeringUniversity of WollongongWollongong NSW 2522Australia 中国矿业大学(北京)应急管理与安全工程学院北京100083 辽宁工程技术大学安全科学与工程学院辽宁葫芦岛125105

冲击地压与瓦斯等灾害制约了我国煤矿安全高效开采,但诸多煤岩动力灾害的发生机理不明。从巷道围岩冲击-瓦斯灾害实例出发,着重研究煤岩损伤破裂演化规律与模型。开展了X射线高精度显微CT扫描试验,利用三维重构技术获得了冲击倾向性煤... 详细信息

冲击地压与瓦斯等灾害制约了我国煤矿安全高效开采,但诸多煤岩动力灾害的发生机理不明。从巷道围岩冲击-瓦斯灾害实例出发,着重研究煤岩损伤破裂演化规律与模型。开展了X射线高精度显微CT扫描试验,利用三维重构技术获得了冲击倾向性煤高分辨率三维数字岩心图像,定量分析了非连续结构分布特征;采用计盒维数法和三维可视化软件AVIZO编程计算,得到了矿物条带和裂隙结构的表征参数;基于CT扫描重构和统计强度理论,提出了一种考虑三参量韦伯分布、瓦斯作用与有效应力的煤岩损伤破裂模型;进而,开展了含瓦斯煤岩三轴压缩试验,求解模型参数并验证模型可靠,揭示了煤岩渐进破坏过程中的损伤演化规律。具体而言,显微CT扫描重构和分形计算结果表明,冲击倾向煤内部矿物条带的表面积和分形维数分别处于0.0035~0.0137和1.1214~1.2342之间,而裂隙结构的表面积占比和分形维数则分别处于0.0006~0.0040和1.0651~1.1454范围。矿物条带的表面积占比和分形维数整体上大于裂隙结构的,说明冲击倾向煤内部的非连续结构数量多且分布复杂。此外,含瓦斯煤岩三轴压缩试验结果表明,围压作用下煤样应力应变关系呈现出典型的I类曲线特征,以剪切破坏为主,峰值强度和峰值应变随围压升高而增大。进一步,给出了损伤破裂模型7个参数的确定方法,并利用试验结果求解了模型参数和损伤变量。计算结果表明,该模型能较准确地反映煤岩压缩变形、准线弹性变形、塑性变形、峰值强度和峰后软化等渐进破坏特征。而且,在前2个阶段煤岩损伤变量小于0.2,进入塑性阶段尤其是峰后阶段,损伤变量急剧增大直至破裂。因此,提出了损伤阈值的概念,建议将损伤阈值0.2作为煤岩损伤破裂的预警值。研究结果将为煤岩动力灾害的发生机理、预警及防控提供理论支撑。

关键词：巷道围岩冲击-瓦斯灾害显微CT扫描三维重构数字岩心非连续结构三参量韦伯分布损伤变量损伤破裂模型

在线全文

学校读者我要写书评

暂无评论

地质聚合物的制备与应用研究现状

有色金属（冶炼部分） 2024年第5期 126-135页

作者：包申旭周海林张一敏黄慕洋 Dombon Enkhbat 武汉理工大学关键非金属矿产资源绿色利用教育部重点实验室武汉430070 武汉理工大学资源与环境工程学院武汉430070 武汉科技大学国家环境保护矿冶资源利用与污染控制重点实验室武汉430081 School of Geology and mining Engineering Mongolian University of Science and TechnologyUlaanbaatar 155141Mongolian

地质聚合物是由硅铝酸盐原料经激发剂激发得到的一种无机非金属材料,具有原料来源广泛、制备工艺简单、碳排放量低、高强耐久等优点,应用前景非常广阔。介绍了地质聚合物及其性能特点,对制备过程中的原料活化、激发剂、外加剂和养护制... 详细信息

地质聚合物是由硅铝酸盐原料经激发剂激发得到的一种无机非金属材料,具有原料来源广泛、制备工艺简单、碳排放量低、高强耐久等优点,应用前景非常广阔。介绍了地质聚合物及其性能特点,对制备过程中的原料活化、激发剂、外加剂和养护制度等工艺的研究现状进行了总结,列举了地质聚合物在胶凝材料、隔热吸音、催化剂和固封材料等领域的应用实例,并评述了其在制备及应用方面需要进一步探索的问题。

关键词：地质聚合物制备应用激发剂外加剂