检索结果-南通市图书馆

维普期刊数据库

Roadmap of amorphous metal-organic framework for electrochemical energy conversion and storage

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第3期16卷 4107-4118页

作者： Hang Wang Qi Yang Nan Zheng Xingwu Zhai Tao Xu zhixin sun Liang Wu Min Zhou Hefei National Laboratory for Physical Sciences at the Microscale School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China

Metal-organic frameworks(MOFs),a well-known coordination network involving potential voids,have attracted attention for energy conversion and *** far as is known,MOFs are not only believed to be *** amorphous MOFs(aMOFs)are starting as supplementary to crystalline MOF(cMOF)in various electrochemical energy fields owing to intrinsic superiorities over crystalline states,greater ease of processing,and distinct physical and chemical *** retain the basic skeletons and connectivity of building units but without any long-range *** structural features over long range possess the isotropy without grain boundaries,resulting in fast ions flux and uniform ***,distinct shortrange characteristics provide diverse pore confined environment and abundant active sites,and thus accelerate mass transport and charge transfer during electrochemical *** understandings and controllable design of aMOF may broaden the opportunities for both scientific researches beyond crystalline materials and practical *** date,comprehensive reviews about aMOFs in the fields of energy conversion and storage remain woefully ***,we summarize the roadmap of aMOF from the development,structural design,opportunity,application,bottleneck,and ***-depth structure-activity relationships with aMOF chemistry are highlighted in the typical electrochemical energy conversion like water oxidation and energy storage,including supercapacitor and *** combination of disordered nature at long range and short range,alongside the dynamic structural changes,is promising to reinforce cognition of aMOF domains with MOF versatility,shedding light on the design for efficient electrochemical energy applications via amorphization.

关键词： metal-organic frameworks amorphization energy conversion energy storage

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于OBE教育理念的创新创业教学模式研究

河北旅游职业学院学报 2024年第2期29卷 84-90页

作者：孙志新王秋颖刘静波崔永红河北旅游职业学院河北承德067000

基于OBE教育理念开展创新创业教学模式改革,结合专业岗位需求重构递进式学习内容,反向设计多阶段可评可测的学习目标。探索以学生为中心、以项目为驱动、以团队为组织、以实践为模拟的教学组织形式,创设“自主、合作、探究”新型体验式... 详细信息

基于OBE教育理念开展创新创业教学模式改革,结合专业岗位需求重构递进式学习内容,反向设计多阶段可评可测的学习目标。探索以学生为中心、以项目为驱动、以团队为组织、以实践为模拟的教学组织形式,创设“自主、合作、探究”新型体验式学习课堂。推进信息技术与课堂教学深度融合,多渠道学习资源为保障拓宽学生学习场景,构建线上线下智慧教学,开展全程化多元混合式课程评价,构建“专创融合”“思创融合”“课赛融合”“赛创融和”的一体化教学模式。

关键词： OBE 教育创新创业

维普期刊数据库

Enabling End-to-End Communication Between Wireless Sensor Networks and the Internet Based on 6Lo WPAN

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2015年第3期24卷 633-638页

作者： LUO Bingqing sun zhixin College of Internet of Things Nanjing University of Posts and Telecommunications

In the paradigms of the Internet of things(Io T), sensor nodes could collect the data through the Wireless sensor network(WSN), and could be managed and accessed by human users through the Internet. There are many challenges remain. Taking advantage of IPv6,IPv6 over Low-power personal area networks(6Lo WPANs)implemented on resource constrained devices makes the connection possible and easier. This paper is contributing on constructing architecture of the end-to-end communication system based on 6Lo WPAN gateway, which enabled convergence of IPv6 network and low-power wireless networking, featuring encapsulating 6Lo WPAN adapter layer in a Network adapter driver(NAD) of personal computer. Using real commercial deployment, the result of application test bed shows that the IPv6 hosts could be interactive with IP-based sensor nodes through 6Lo WPAN gateway with acceptable latency and packet loss.

关键词： 6Lo WPAN IP-based wireless sensor network Gateway Network adapter driver

On Least Squares Weighted Recursive Estimation of Clock Skew and Offset in Wireless Sensor Networks

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2017年第5期26卷 1041-1047页

作者： HU Bing sun zhixin Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and Telecommunications

Three clock synchronization algorithms for Wireless sensor networks(WSNs) in Pairwise broadcast synchronization(PBS) mechanism are *** include the joint Least squares estimator(LS),joint Least squares weighted estimator(LSW) and joint Least squares weighted Recursive estimator(R-LSW).For these estimators,the corresponding algorithms are derived and described by assuming a Gaussian random delay *** PBS,these estimators can achieve the Cramer-Rao lower bound(CRLB) for both listening node and active node without knowledge of the deterministic *** purpose of considering R-LSW is to reduce the use of storage space with the method of estimating while *** and analytical results verify that the estimators are efficient.

关键词： Clock synchronization Wireless sensor networks(WSNs) Pairwise broadcast synchronization(PBS) Least squares estimator(LS)

Research on the Model of a Lightweight Resource Addressing

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2015年第4期24卷 832-836页

作者： LUO Bingqing sun zhixin College of Internet of Things Nanjing University of Posts and Telecommunications

This paper discussed the characteristics of addressing from the perspective of Internet addressing mechanism. An Internet of things(IOT) resource addressing iteration model was defined. In the model, a direct addressing mode for active nodes and an indirect addressing mode for passive codes were proposed, which meet the requirement for multiple encoding mode. A unified IOT resource lightweight addressing scheme based on IPv6 has been proposed to implement the two addressing modes. The scheme utilized the virtual domain to solve the problem of the heterogeneous encoding. The paper implemented the addressing process from the Internet host to the sensor node based on IPv6 over low-power wireless personal area networks(6Lo WPAN) protocol. The experiment results show that the scheme is performed to realize communication between wireless sensor networks and IPv6 networks.

关键词： Addressing Lightweight IPv6 networks Iteration model Unified addressing scheme

LANDMARC Localization Algorithm Based on Weight Optimization

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2018年第6期27卷 1291-1296页

作者： HU Bing PENG Huijun sun zhixin Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and Telecommunications

In order to solve the problem that the difference of Received signal strength(RSS) between tags will become large when tags are close to the reader, which exists in LANDMARC system, a LANDMARC localization algorithm based on weight optimization is proposed in the paper. We optimize the weight by redefining the formulas of in-weight and ex-weight. In-weight formula is discussed under the free space propagation model. The definition of ex-weight is obtained by analyzing the relationship between RSS and distance under the log-distance path loss model. We evaluate the performance of the proposed algorithm and compare it with the algorithm based on normalized weight. The simulation results show the superior performance of the proposed algorithm in terms of location accuracy.

关键词： Location identification based on dynamic active RFID calibration(LANDMARC) system Radio frequency identification(RFID) Indoor localization Weight optimization

The middle Cambrian Linyi Lagerst?tte from the North China Craton: a new window on Cambrian evolutionary fauna

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2022年第7期9卷 152-161页

作者： zhixin sun Fangchen Zhao Han Zeng Cui Luo Heyo Van Iten Maoyan Zhu State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontologyand Center for Excellence in Life and PalaeoenvironmentChinese Academy of Sciences College of Earth and Planetary Sciences University of Chinese Academy of Sciences Department of Geology Hanover College Department of Invertebrate Paleontology Cincinnati Museum Center

The rapid appearance of major animal groups and complex marine communities during the Cambrian explosion is recorded in large part in Burgess Shale-type ***,the restricted temporal and spatial distribution of known lagerstatten continues to hinder the formation of a comprehensive perspective on Cambrian evolutionary *** we describe the Linyi Lagerstatte(ca.504 mya),a new Cambrian Miaolingian lagerstatte from the Zhangxia Formation in Shandong Province,North *** Linyi Lagerstatte contains a variety of well-preserved soft-bodied fossils,among which the non-trilobite arthropods,particularly the mollisoniids and radiodonts,are the most important *** new assemblage is remarkable for its excellent preservation of arthropod limbs,eyes and guts,as well as for its close similarity in taxonomic composition to Laurentian *** distinctive Linyi Lagerstatte holds great promise for providing additional insights into the morphological disparity,community structure and paleogeographic range of marine faunas during the middle Cambrian(Miaolingian).

关键词：

微细粒锡石涡流强化浮选及CFD数值模拟研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

矿产保护与利用 2024年第1期44卷 16-23页

作者：葛昱谦李晓恒孙志新韩鑫定张明青闫小康中国矿业大学化工学院江苏徐州221116 中国矿业大学国家煤加工与洁净化工程技术研究中心江苏徐州221116 中国矿业大学环境与测绘学院江苏徐州221116

为提高微细粒锡石矿物的浮选回收效果,采用基于湍流涡调控技术的新型涡流浮选装置对微细粒锡石(d50=16.45μm)进行了浮选实验研究,考察了涡流发生器结构及矿浆循环量对微细粒锡石浮选的影响。通过涡流矿化管内部流场CFD数值模拟,分析了... 详细信息

为提高微细粒锡石矿物的浮选回收效果,采用基于湍流涡调控技术的新型涡流浮选装置对微细粒锡石(d50=16.45μm)进行了浮选实验研究,考察了涡流发生器结构及矿浆循环量对微细粒锡石浮选的影响。通过涡流矿化管内部流场CFD数值模拟,分析了涡流矿化改善微细粒浮选效果的原因。浮选实验表明,使用矩形涡流发生器诱导方式且在循环量0.6 m3/h(Re=21 220)时锡石的回收率为92.96%,精矿锡品位为3.32%。在获得精矿锡品位几乎相同的情况下,回收率相较于光管提高了25.73个百分点;CFD模拟分析结果表明内置矩形涡流发生器的矿化管内平均湍流耗散率和平均湍流动能最高,分别是光管的13.01倍和7.03倍,碰撞概率从1.07%提高到2.32%,矩形涡流发生器能显著改善矿化管的湍流环境,增大了微细颗粒-气泡的碰撞概率,从而起到强化微细粒锡石浮选的作用。

关键词：锡矿微细粒浮选涡流发生器数值模拟

维普期刊数据库

Secure P2P topology based on a multidimensional DHT space mapping

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2013年第5期56卷 224-237页

作者： sun zhixin LUO BingQing CHEN YaDang BU Kai Key Laboratory of Broadband Wireless Communication and Sensor Network Technology(Nanjing University of Posts and Telecommunications) Ministry of Education State Key Laboratory for Novel Software Technology Nanjing University

Distributed search and routing algorithms based on the DHT(distributed hash table) protocol have attracted considerable attention in structured P2P(peer-to-peer) research as a result of favorable properties such as distribution,self-organization,and high *** with a traditional C/S(client/server) network,the probability of peers initiating malicious behavior increases dramatically because of their self-governing and dynamic characteristics,which also make it harder to satisfy the peers’ security required by *** this paper,we propose a new secure DHT protocol based on a multidimensional mapping *** mechanism maps peers to a multidimensional space by dividing the identifiers into ***,a series of secure methods and routing algorithms are provided to achieve secure DHT in smaller *** with state-ofthe-art approaches,the theoretical analysis and experimental results show that the multidimensional mapping mechanism can effectively improve the average success rate of a resource search by inhibiting malicious behavior.

关键词： multidimensional mapping DHT(distributed hash table) structured P2P(peer-to-peer) network routing attack security