检索结果-南通市图书馆

Study on performance of PVDF piezoelectric film for the separator in Li-ion rechargeable cell

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2013年第11期56卷 2646-2648页

作者： LIU YingQi LI XiuWan wei xiucheng HE DeYan School of Physical Science and Technology and Key Laboratory for Magnetism and Magnetic Materials of the Ministry of EducationLanzhou University

The properties of piezoelectric PVDF films as separators are studied in NiO/Li electrodes Li-ion power *** results show that the PVDF piezoelectric film with excellent insulation is suitable for the environmental energy harvesting *** is attributable to the compact structure of the piezoelectric PVDF film,and which make it has low leakage current and low charge-discharge current characteristics.

关键词： PVDF piezoelectric film Li-ion rechargeable cell separator

Preparation and electrochemical performance of MWCNTs@MnO_2 nanocomposite for lithium ion batteries

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2014年第6期57卷 1077-1080页

作者： LIU YingQi LI XiuWan wei Zhiwei ZHANG LiPing wei xiucheng HE DeYan School of Physical Science and Technology and Key Laboratory for Magnetism and Magnetic Materials of the Ministry of EducationLanzhou University

Tubular nanocomposite with interconnected MnO2 nanoflakes coated on MWCNTs(MWCNTs@MnO2)was fabricated by an aqueous solution method at 80°*** electron microscopy,X-ray diffraction and galvanostatic charge-discharge tests were used to characterize the structures and electrochemical performances of the as-prepared *** capacity reaches 1233.6 mA h g-1 at a current density of 100 mA g-1 for the first discharge,and it can still maintain a capacity of 633.1mA h g-1 after 100 charge-discharge *** results show that MWCNTs with good electrical conductivity as anchors of MnO2 can provide fast electron transport channels for MnO2 in the electrochemical reactions,and the as-prepared MWCNTs@MnO2 nanocomposite is a potential anode material for lithium ion batteries.

关键词： manganese dioxide multi-walled carbon nanotubes nanocomposite aqueous solution preparation electrochemical performances lithium ion battery

Detection of gas reservoirs by the joint use of P- and PS-waves: A case study on the Ordos basin, China

在线全文

学校读者我要写书评

暂无评论

Earthquake Science 2009年第3期22卷 307-313页

作者： xiucheng wei Xiangyang Li Yang Liu Songqun Shi weidong Jiang Petroleum Exploration and Production Institute China Petroleum and Chemical Corporation Beijing 100083 China Edinburgh Anisotropy Project British Geological Survey Edinburgh EH9 3LA UK Faculty of Resources and Information China University of Petroleum Beijing 102249 China Changqing Research Institute China National Petroleum Corporation Xi'an 710021 China Changqing Institute of East Geophysical Company China National Petroleum Corporation Xi' an 710021 China

We present an example of using converted-waves for characterizing onshore gas reservoirs in the Ordos basin in Northwest China. The Ordos basin is the largest gas province in China. The main gas reservoirs （about 3 300 m in depth） are in upper Paleozoic sandstone that has low or reversed P-wave impedance and is immediately above a coal seam. This makes it very difficult to image the gas reservoirs using conventional P-wave data. Analysis of core, log and VSP data shows a weak PP reflection but a relatively strong PS-converted wave reflection, or both strong PP- and PS-reflections but with opposite polarity from the gas bearing sands, which indicates the potential of using PS-waves to image the gas reservoirs in the Ordos basin. Subsequently, thirteen seismic lines were acquired, processed and interpreted to verify the PP- and PS-responses, and two corresponding attributes （PP- and PS- amplitude ratio and polarity ratio） are used to map the reservoirs through joint PP and PS analysis.

关键词： gas reservoir P- and PS-waves well log data processing

Reservoir prediction using multi-wave seismic attributes

在线全文

学校读者我要写书评

暂无评论

Earthquake Science 2011年第4期24卷 373-389页

作者： Ye Yuan Yang Liu Jingyu Zhang xiucheng wei Tiansheng Chen State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China CNPC Key Laboratory of Geophysical Prospecting China University of Petroleum Beijing 102249 China Petroleum Exploration and Production Research Institute SINOPEC Beijing 100083 China

The main problems in seismic attribute technology are the redundancy of data and the uncertainty of attributes, and these problems become much more serious in multi-wave seismic exploration. Data redundancy will increase the burden on interpreters, occupy large computer memory, take much more computing time, conceal the effective information, and especially cause the ＂curse of dimension＂. Uncertainty of attributes will reduce the accuracy of rebuilding the relationship between attributes and geological significance. In order to solve these problems, we study methods of principal component analysis （PCA）, independent component analysis （ICA） for attribute optimization and support vector machine （SVM） for reservoir prediction. We propose a flow chart of multi-wave seismic attribute process and further apply it to multi-wave seismic reservoir prediction. The processing results of real seismic data demonstrate that reservoir prediction based on combination of PP- and PS-wave attributes, compared with that based on traditional PP-wave attributes, can improve the prediction accuracy.

关键词： seismic attribute multi-wave exploration independent component analysis supportvector machine reservoir prediction

Pure S-waves in land P-wave source VSP data

在线全文

学校读者我要写书评

暂无评论

Applied Geophysics 2007年第3期4卷 173-182页

作者： Liu Yang Zhang Qinghong Bao Leiying wei xiucheng Key Laboratory of Geophysical Exploration of CNPC China University of Petroleum Beijing 102249 China Borehole Seismic Center East Geophysical Company of CNPC Zhuozhou Zhuozhou 072751 China Exploration and Production Research Institute of SINOPEC Beijing 100083 China

Conventional land vertical seismic profiling （VSP） exploration usually uses P-wave sources and three-component geophones for receivers, emphasizing P- and converted S-waves. Previous studies show that both dynamite borehole shots and vertical vibrations from controllable seismic sources at the surface will produce relatively strong pure P-waves and weaker pure S-waves. Interfaces with a large Poisson＇s ratio difference have a positive influence on the formation of strong transmitted converted S-waves. By a comparative analysis of pure S-waves from sources and converted downgoing S-waves, we believe that the main frequency of pure S-waves is usually lower than pure P-waves while the main frequency of downgoing converted S-waves is close to that of P-waves. We have studied zero-offset and offset VSP data from land P-wave sources. Results show that pure S-waves commonly exist in these data with differences in wave intensity. S-wave velocity can be obtained from the P-wave source zero-offset VSP data. Finally, we discuss the bright future of joint application of VSP P-and S-waves and the full use of S-waves in P-wave source VSP data.

关键词： Land VSP P-wave source pure S-wave

Simulation and Traffic Safety Assessment of Heavy-Haul Railway Train-Bridge Coupling System under Earthquake Action

在线全文

学校读者我要写书评

暂无评论

Structural Durability & Health Monitoring 2024年第6期18卷 835-851页

作者： Liangwei Jiang wei Zhang Hongyin Yang xiucheng Zhang Jinghan Wu Zhangjun Liu Engineering Research Center of Disaster Prevention and Mitigation of Southeast Coastal Engineering Structures(JDGC03) Fujian Province UniversityPutian351100China School of Civil Engineering and Architecture Wuhan Institute of TechnologyWuhan430073China Hubei Provincial Engineering Research Center for Green Civil Engineering Materials and Structures Wuhan430073China

Aiming at the problem that it is difficult to obtain the explicit expression of the structural matrix in the traditional train-bridge coupling vibration analysis,a combined simulation system of train-bridge coupling system(TBCS)under earthquake(MAETB)is developed based on the cooperative work of MATLAB and *** simulation system is used to analyze the dynamic parameters of the TBCS of a prestressed concrete continuous rigid frame bridge benchmark model of a heavy-haul *** influence of different driving speeds,seismic wave intensities,and traveling wave effects on the dynamic response of the TBCS under the actions of the earthquakes is *** results show that the bridge displacement increase in magnitude in the lateral direction is more significant than in the vertical direction under the action of an *** traveling wave effect can significantly reduce the lateral response of the bridge,but it will significantly increase the train derailment *** the earthquake intensity exceeds 0.2 g,the partial derailment coefficient of the train has exceeded the limit value of the specification.

关键词： Train-bridge coupling vibration analysis dynamic response earthquake action traveling wave effect

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

高精度转换波速度分析

石油勘探与开发 2000年第2期27卷 57-59页

作者：魏修成刘洋石油大学

转换波速度分析在多波地震资料处理中占有重要地位。常规转换波速度是先抽CCP道集 ,然后进行转换波分析 ,而抽CCP道集需要速度 ,转换速度分析的目的又是为了计算速度 ,因此常规转换波速度分析是一个迭代的过程。精确的无迭代分析方法在... 详细信息

转换波速度分析在多波地震资料处理中占有重要地位。常规转换波速度是先抽CCP道集 ,然后进行转换波分析 ,而抽CCP道集需要速度 ,转换速度分析的目的又是为了计算速度 ,因此常规转换波速度分析是一个迭代的过程。精确的无迭代分析方法在速度扫描过程中 ,根据转换波层位时间、纵波速度和横波速度 ,动态地抽取相应层位的CCP道集和计算速度分析检测因子 ,来实现精确无迭代转换波速度分析。实际资料处理结果表明该方法可行。

关键词：转换波速度分析地震勘探地震波地震数据

Matching pursuit time-frequency decomposition using wideband B-spline wavelet

在线全文

学校读者我要写书评

暂无评论

Matching pursuit time-frequency decomposition using wideband...

中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Liu Lanfeng Li Lihua wei xiucheng Huang Zhongyu Petroleum Research Institute of Exploration & Development SINOPEC China University of Petroleum(Beijing) Beijing Yadan Technology Development Co. Ltd

A new time-frequency decomposition method is implemented based on the general matching pursuit in virtue of the high resolution and the parameter -adjustment flexibility of wideband B-spline wavelet with four *** paper discusses the accuracy and validity of the method through theoretic model *** time-frequency spectrum calculated by this algorithm has higher resolution and better time-frequency localization than that calculated by Morlet *** apply it to the real seismic data successfully,and the low-frequency energy section calculated by this method can well reflect the reservoir heterogeneity and detail information in the reservoir.

关键词： wideband B-spline wavelet matching pursuit time-frequency decomposition instantaneous spectrum

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

紧密纺纱疵产生原因及预防措施

棉纺织技术 2013年第4期41卷 47-49页

作者：魏秀成山东东营市宏远纺织有限公司

探讨三罗拉网格圈紧密纺几种纱疵产生的原因及预防措施。分析阐述了紧密纺毛羽纱、条干不匀纱及竹节纱等纱疵的产生原因。实际生产中,应更加细致、严格地做好各项管理工作,采取有针对性的技术措施,才能有效地降低纱疵,纺出档次较高、满... 详细信息

探讨三罗拉网格圈紧密纺几种纱疵产生的原因及预防措施。分析阐述了紧密纺毛羽纱、条干不匀纱及竹节纱等纱疵的产生原因。实际生产中,应更加细致、严格地做好各项管理工作,采取有针对性的技术措施,才能有效地降低纱疵,纺出档次较高、满足用户质量要求的紧密纱。

关键词：紧密纺毛羽条干竹节纱纱疵网格圈负压