检索结果-南通市图书馆

Mitigation of the blast load effects on a building structure using newly composite structural configurations

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2021年第1期17卷 75-84页

作者： Ahmed K.Taha M.S.Zahran zhengguo gao School of Transportation Science and Engineering Beihang University(Beijing University of Aeronautics and Astronautics)Beijing100191PR China Department of Civil Engineering Military Technical CollegeEgypt

In this study,a nonlinear three-dimensional hydrocode numerical simulation was carried out using AUTODYN-3D to investigate the effect of blasting of a high explosive material(TNT)against several configurations of the composite *** numerical models were carried out to study the effect of varying the thickness of the walls and the effect of adding an air layer or aluminum foam layer inside two layers of concrete in mitigating the effect of blast waves on the structure *** results showed that increasing the thickness of walls has a good effect on mitigating the effect of blast *** a layer of air was added,the effect of blast waves was exaggerated,while when a layer of aluminum foam was added the blast wave effects were mitigated with a reasonable percentage.

关键词： Concrete structures Blast waves Numerical simulation TNT

A Review of Anode Materials for Dual‑Ion Batteries

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第11期16卷 618-674页

作者： Hongzheng Wu Shenghao Luo Hubing Wang Li Li Yaobing Fang Fan Zhang Xuenong gao zhengguo Zhang Wenhui Yuan School of Chemistry and Chemical Engineering Guangdong ProvinceSouth China University of TechnologyGuangzhou 510641People’s Republic of China Zhuhai Modern Industrial Innovation Research Institute of South China University of Technology Zhuhai 519125Guangdong ProvincePeople’s Republic of China School of Environment and Energy Guangdong ProvinceSouth China University of TechnologyGuangzhou 510641People’s Republic of China

Distinct from"rockingchair"lithium-ion batteries(LIBs),the unique anionic intercalation chemistry on the cathode side of dual-ion batteries(DIBs)endows them with intrinsic advantages of low cost,high voltage,and ecofriendly,which is attracting widespread attention,and is expected to achieve the next generation of large-scale energy storage *** the electrochemical reactions on the anode side of DIBs are similar to that of LIBs,in fact,to match the rapid insertion kinetics of anions on the cathode side and consider the compatibility with electrolyte system which also serves as an active material,the anode materials play a very important role,and there is an urgent demand for rational structural design and performance optimization.A review and summarization of previous studies will facilitate the exploration and optimization of DIBs in the ***,we summarize the development process and working mechanism of DIBs and exhaustively categorize the latest research of DIBs anode materials and their applications in different battery ***,the structural design,reaction mechanism and electrochemical performance of anode materials are briefly ***,the fundamental challenges,potential strategies and perspectives are also put *** is hoped that this review could shed some light for researchers to explore more superior anode materials and advanced systems to further promote the development of DIBs.

关键词： Dual-ion batteries Anode Carbonaceous materials Metallic materials Organic materials Optimization strategies

Earthquake Response and Isolation Layer Parameter Effect of Seismic Isolation Systems of Transformers With Bushings

在线全文

学校读者我要写书评

暂无评论

中国电机工程学报 2012年第13期32卷 I0023-I0023,206页

作者： CAO Meigen ZHOU Fulin TAN Ping ZHANG Guangping gao zhengguo China Electric Power Research Institute Guangdong Key Laboratory of Earthquake Engineering ＆ Applied Technique （Guangzhou University） Gansu Electric Power Design institute Beihang University

国内外震害表明，变压器在地震中的破坏型式多样，易损性极高。隔震技术是一项能够有效降低地震反应的新型抗震技术，而变压器及套管隔震层的设计和参数选择与普通结构有较大的差异。首先，建立了大型电力变压器及套管隔震体系的多质点... 详细信息

国内外震害表明，变压器在地震中的破坏型式多样，易损性极高。隔震技术是一项能够有效降低地震反应的新型抗震技术，而变压器及套管隔震层的设计和参数选择与普通结构有较大的差异。首先，建立了大型电力变压器及套管隔震体系的多质点分析模型，采用Matlab软件编写计算程序，分别输入人工地震波和Taft地震波，对变压器及套管隔震体系的地震响应进行分析；最后，开展了隔震层等效水平网0度、等效阻尼比、双线性恢复力模型的屈服剪力系数及屈服后刚度等参数的地震响应影响分析。分析结果表明：合理设计变压器及套管隔震体系的隔震层参数，可有效降低变压器及套管的地震响应；另外，通过隔震层的参数分析，得到了相关参数的合理取值范围。该研究对今后变压器及套管隔震体系的设计具有参考与指导作用。

关键词：电力变压器隔震系统隔震层地震反应套管高功率变压器加速度响应抗震可靠性

在线全文

学校读者我要写书评

暂无评论

郑煤集团机关机构改革的实践与启示

中国煤炭 2006年第1期32卷 73-75页

作者：郜振国郑煤集团公司河南省郑州矿区452371

针对郑煤集团公司存在的大企业病问题,2005年2月以来,郑煤集团公司按照“因事设岗,一岗多责,职权分明,精干高效”的原则,进行了机构改革。论述改革的背景、总体目标、基本思路、方法步骤、取得的成果。

关键词：管理机构改革郑煤集团郑煤集团公司机关大企业

Tectonic framework of Qilian orogen: reveal from an aeromagnetic anomaly feature

在线全文

学校读者我要写书评

暂无评论

Applied Geophysics 2024年第3期21卷 528-548,618,619页

作者： Yang Hai Xiong Shengqing Liu Qiankun Zhou Daoqing Yang Xue Fan zhengguo Jia Zhiye Li fang gao xiuhe Liu fuxiang China Aero Geophysical Survey and Remote Sensing Center for Natural Resource Beijing100083China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China

The Qilian Orogenic belt is one of the typical orogenic belts globally and a natural laboratory for studying plate *** researchers have studied the ophiolite and high pressure and ultra-high pressure metamorphic rocks in the Qilian orogen and obtained valuable ***,a hot debate exists on the basement property,the distribution of ophiolite,and the boundaries of tectonic ***-scale high-precision aeromagnetic surveys have recently been conducted in the Qilian Orogenic belt and adjacent *** this study,we are trying to analysis the tectonic framework of the Qilian Orogen using 1:500,000 aeromagnetic *** results provide geophysical perspectives for studying the structural framework and deformation of this *** to the aeromagnetic∆T anomaly map,the central and Southern Qilian have the same magnetic anomaly feature that noticeably differs from the North Qilian Orogenic belt and the Qaidam *** result indicates that the central and Southern Qilian have a unified magnetic basement and differ from the North Qilian orogenic belt and Qaidam *** map shows the distribution of ophiolite in the North Qilian orogenic *** magnetic anomalies represent the ophiolites because the mafic–ultramafic rocks usually have high magnetic *** ophiolite belts are continuously distributed in the western part of North Qilian orogenic belt and have a large ***,the scale of the ophiolite belt and the outcropping of mafic–ultramafic rocks reduces when they pass through Qilian County to the *** results indicate differences in the evolution process between the eastern and western parts of North Qilian,with Qilian County as the transition *** study also systematically defines the geophysical boundaries of the Qaidam Block,Qilian Block,North Qilian Orogenic belt,and Alxa *** is proposed that the sinistral displacement of the Altun Fault is adjusted and absorbed by the series of NE-trending fau

关键词： Qilian orogen tectonic framework aeromagnetic anomaly feature mafic–ultramafic

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

颗粒滚动阻力本构参数标定试验研究

上海理工大学学报 2023年第6期45卷 574-583页

作者：董朋昆高政国北京航空航天大学交通科学与工程学院北京100191

针对颗粒滚动阻力本构参数难以通过阻力测量试验来直接标定,开展了两种离散元滚动阻力模型MDEM(modified discrete element method)和HDEM(hysteresis discrete element method)参数的试验标定方法研究。利用自由滚动颗粒的摆动过程建... 详细信息

针对颗粒滚动阻力本构参数难以通过阻力测量试验来直接标定,开展了两种离散元滚动阻力模型MDEM(modified discrete element method)和HDEM(hysteresis discrete element method)参数的试验标定方法研究。利用自由滚动颗粒的摆动过程建立了颗粒间滚动刚度系数Kr与滚动阻尼系数Cr的试验标定公式,搭建了激光位移传感器测量颗粒微振动的光学试验平台,通过测量试件摆动时程曲线实现了MDEM模型中K_(r)和C_(r)的标定;提出基于材料单轴循环拉伸试验的标定方法,利用颗粒本体材料加卸载循环作用下的滞回曲线实现了HDEM模型中的弹性滞后系数β的标定。试验结果表明,该试验方法能够有效地标定颗粒间滚动阻力本构参数。

关键词：滚动阻力参数 MDEM模型 HDEM模型弹性滞后

含初始裂缝水泥混凝土路面对冲击荷载响应分析

在线全文

学校读者我要写书评

暂无评论

北京航空航天大学学报 2019年第7期45卷 1474-1480页

作者：陈扬童朝霞冯锦艳高政国北京航空航天大学交通科学与工程学院

冲击荷载对水泥混凝土路面的破坏与普通交通荷载有很大不同。采用数值模拟方法,探索了冲击荷载作用下面层具有不同初始裂缝长度和位置的水泥混凝土路面的动态响应特性。研究发现水泥混凝土路面最终扩展的裂缝长度和沉降随初始裂缝长度... 详细信息

冲击荷载对水泥混凝土路面的破坏与普通交通荷载有很大不同。采用数值模拟方法,探索了冲击荷载作用下面层具有不同初始裂缝长度和位置的水泥混凝土路面的动态响应特性。研究发现水泥混凝土路面最终扩展的裂缝长度和沉降随初始裂缝长度的增加而增大,随初始裂缝与荷载作用中心距离的增加而减小。当初始裂缝长度与面层厚度的比超过某一值时,水泥混凝土路面会产生贯穿性的裂缝。初始裂缝长度的不同主要影响的是面层以下约5倍水泥混凝土面层厚度范围内石灰土和黄土的压缩变形。初始裂缝长度和位置的不同对荷载作用中心1 m范围内水泥混凝土路面的沉降有较显著的影响。

关键词：冲击荷载水泥混凝土路面裂缝沉降数值模拟

在线全文

学校读者我要写书评

暂无评论

巨型贮煤筒仓有限元分析

工业建筑 2007年第Z1期37卷 351-355页

作者：周永强高政国北京航空航天大学土木工程系北京100083

对一直径120m、容量达10万t的巨型钢筋混凝土贮煤筒仓在局部堆煤荷载以及温度荷载作用下分别进行有限元分析,其中筒仓基础按三种约束刚度不同的模型进行处理。计算出各种堆煤工况以及温度荷载下的变形与内力。结果表明,局部堆煤对结构... 详细信息

对一直径120m、容量达10万t的巨型钢筋混凝土贮煤筒仓在局部堆煤荷载以及温度荷载作用下分别进行有限元分析,其中筒仓基础按三种约束刚度不同的模型进行处理。计算出各种堆煤工况以及温度荷载下的变形与内力。结果表明,局部堆煤对结构变形与承载产生极为不利的影响,温度作用的影响不容忽视,基础约束刚度对抵抗煤压有利,而对抵抗温度荷载作用不利。可为巨型贮煤筒仓结构设计提供依据。

关键词：巨型筒仓局部荷载温度作用地基基础有限元

南方CASS软件绘制数字化地形图等高线的应用和技巧

在线全文

学校读者我要写书评

暂无评论

科技传播 2010年第22期2卷 227-228页

作者：高正国郑州市自来水总公司设计院河南郑州450013

本文介绍了南方CASS软件的等高线绘制方法,并结合工作经验,提出CASS软件在绘制等高线方面的注意事项和技巧。

关键词： CASS软件等高线技巧