检索结果-南通市图书馆

维普期刊数据库博看期刊

Blast response of full-size concrete walls with chemically reactive enamel （CRE）-coated steel reinforcement

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2016年第9期17卷 689-701页

作者： Dong-ming YAN Hua-wei YIN Cheng-lin WU Yan-long LI Jason BAIRD Gen-da.CHEN School of Civil and Architectural Engineering Zhejiang University Hangzhou 310058 China College of Civil Engineering Hunan University Changsha 410082 China Department of Civil Architectural and Environmental Engineering Missouri University of Science and Technology Rolla 654009 USA State Key Laboratory Base of Eco-Hydraulic Engineering in Arid Area Xi'an University of Technology Xi'an 710048 China Rock Mechanics and Explosives Missouri University of Science and Technology Rolla 654009 USA Center for Infrastructure Engineering Studies Missouri University of Science and Technology Rolla 654009 USA

题目：活性瓷釉涂层钢筋混凝土防护墙抗爆性能研究目的：活性瓷釉涂层能够显著增强钢筋的防腐蚀能力，同时能够明显提升钢筋与混凝土的粘结力。通过对活性瓷釉涂层钢筋混凝土防护墙在冲击荷载作用下的破坏特征进行试验和数值模拟，为活... 详细信息

题目：活性瓷釉涂层钢筋混凝土防护墙抗爆性能研究目的：活性瓷釉涂层能够显著增强钢筋的防腐蚀能力，同时能够明显提升钢筋与混凝土的粘结力。通过对活性瓷釉涂层钢筋混凝土防护墙在冲击荷载作用下的破坏特征进行试验和数值模拟，为活性瓷釉涂层技术在钢筋混凝土结构中的应用提供理论基础。创新点：1．对活性瓷釉涂层钢筋混凝土防护墙进行爆炸荷载作用下的破坏试验；2．通过数值模拟，探究活性瓷釉钢纤维对钢筋混凝土结构抗爆能力的影响，为结构设计提出建议。方法1．通过对活性瓷釉涂层钢筋防护墙进行爆炸试验（图2），揭示活性瓷釉涂层钢筋混凝土结构的动力破坏特征（图4和5）；2．通过数值方法研究活性瓷釉涂层对钢筋混凝土防护墙抗爆性能的影响，揭示在不同钢筋．混凝土粘结强度时钢筋混凝土结构整体性的变化规律（图10、13和15）；3．在爆炸试验和数值分析基础上，提出活性瓷釉涂层钢筋混凝土结构抗爆设计建议（图16）。结论：1．活性瓷釉涂层能够显著改善钢筋在混凝土结构中的传力性能：在爆炸荷载作用下，涂层钢筋混凝土结构的破坏程度明显减轻。2．活性瓷釉涂层能够显著改善钢筋混凝土结构的变形特性，并显著增强其耗能能力。3．在采用活性瓷釉涂层进行抗爆设计时，采用直径较小的钢筋可提高结构的吸能能力。

关键词：活性瓷釉涂层爆炸荷载破坏模式粘结力有限元模型

A nucleophilic 1,3-rearrangement leading to 3,4-disubstituted 3,4-dihydroquinolines

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2016年第7期27卷 1036-1039页

作者： Chun-Xian He Zhi-Bo Jiang Hua-Qing Cui da.Li Yin State Key Laboratory of Bioactive Substances and Functions of Natural Medicines Institute of Materia Medica Peking Union Medical College and Chinese Academy of Medical Sciences Department of Medicinal Chemistry Beijing Key Laboratory of Active Substances Discovery and Drugability Evaluation Institute of Materia Medica Peking Union Medical College and Chinese Academy of Medical Sciences

A new nucleophilic 1,3-rearrangement is observed when treating 2-methoxyquinolino-3-lithium with an α-C substituted deoxybenzoin,and this rearrangement yielded an unusual 3,4-disubstituted 3,*** similar reactions were designed and executed to investigate this novel 1,3-rearrangement,and a mechanism involving a nucleophilic addition and a following 1,3-rearrangement with an unusual dearomatization on the quinoline ring is proposed.

关键词： 1,3-Rearrangement Dihydroquinoline derivatives Reaction mechanism

自磨改性对再生粗骨料及再生混凝土性能的影响

在线全文

学校读者我要写书评

暂无评论

材料导报 2023年第16期37卷 157-162页

作者：林一柯何廷树达永琪西安建筑科技大学材料科学与工程学院西安710055

提出了一种新的再生骨料改性技术即自磨改性,系统研究了该技术对再生粗骨料和再生混凝土性能的影响规律,探究了再生微粉附着于再生骨料表面时,对再生混凝土工作性能及力学性能的影响规律。结果表明:自磨改性可以有效改善再生粗骨料的粒... 详细信息

提出了一种新的再生骨料改性技术即自磨改性,系统研究了该技术对再生粗骨料和再生混凝土性能的影响规律,探究了再生微粉附着于再生骨料表面时,对再生混凝土工作性能及力学性能的影响规律。结果表明:自磨改性可以有效改善再生粗骨料的粒形和界面形貌,有利于附着表面砂浆层的剥离,改性后再生粗骨料的表观密度提高了9.7%,压碎指标及吸水率分别降低了37.6%和51.4%,改善了再生混凝土的流动性和黏聚性,有效提升了再生混凝土的抗压强度。再生微粉颗粒尺寸小且表面疏松多孔,同时具有微集料填充效应和火山灰活性,对再生混凝土的后期强度具有明显的提升作用。

关键词：自磨改性再生粗骨料再生混凝土再生微粉二次水化

A reliable and energy-efficient storage system with erasure coding cache

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2017年第9期18卷 1370-1384页

作者： Ji-guang WAN da.ping LI Xiao-yang QU Chao Y-IN Jun WANG Chang-sheng XIE Wuhan National Laboratory for Optoelectronics Department of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

在现代的多副本节能存储系统中,主副本的磁盘总是保持着开启以对外提供服务,而其他副本的磁盘则可以在负载低时保持关闭状态以节能。然而,因为新的写请求不能够被立即同步到所有的磁盘上,所以系统的可靠性被降低了。本文中,我们设计了... 详细信息

在现代的多副本节能存储系统中,主副本的磁盘总是保持着开启以对外提供服务,而其他副本的磁盘则可以在负载低时保持关闭状态以节能。然而,因为新的写请求不能够被立即同步到所有的磁盘上,所以系统的可靠性被降低了。本文中,我们设计了一个基于raID10的具有高可靠性和高能效的副本存储系统——REraID。REraID使用主副本磁盘上的一部分空闲空间结合纠删码构造了一个编码缓存来接收新的写请求。因为通过使用纠删码,编码缓存能够支持2个甚至更多磁盘的故障恢复,所以REraID能够保证与raID10存储系统想当的可靠性。另外,我们还设计了一个纠删码写(erasure coding write,ECW)算法来缓存那些小的随机写,并把它们合并成大的写数据块,然后并行写入编码缓存中以提高写性能。实验结果显示REraID相比现有的方案能够提高写性能并且节省更多的能源。

关键词：可靠性高能效存储系统纠删码缓存管理

Case report of a criminal dismemberment in Northeast Brazil

在线全文

学校读者我要写书评

暂无评论

Forensic Sciences Research 2022年第4期7卷 637-642页

作者： Evelyne Pessoa Soriano Maria do Socorro da.tas de Araújo Francisca de Assis Nascimento Pereira Francisca Divina Silveira de Melo Cristiane Helena da.Silva Barbosa Freire Marcus Vitor Diniz de Carvalho Medico-legal Institute of João Pessoa ParaíbaBrazil Faculty of Dentistry(FOP) Center for Studies in Forensic Anthropology(CEAF)University of Pernambuco(UPE)RecifeBrazil

Several decomposed body parts were received for examination by the Forensic Anthropology section of the Medico-legal Institute of João Pessoa,Paraíba,*** portions of the lower and upper limbs,ribs,vertebrae,and a skull were thoroughly *** biological profile indicated a male individual with an estimated age range between 23 and 57 years and a mean age of 35.2 years(SD=9.4;phase IV,Suchey-Brooks).The skeleton showed injuries caused by sharp force and sharp-blunt force trauma that affected all body ***,the lesions are mainly in the diaphyseal segments of the long bones,sacrum,pelvis,mandible,maxilla,scapulae,sternum,vertebrae,the distal epiphysis of the left fibula,and the distal epiphysis of the left tibia displayed characteristics compatible with injuries produced *** was not possible to determine the cause of *** resulted in a positive *** of common difficulties faced in forensic practice,it is often not possible for forensic anthropologists to go to the crime scene,X-ray or body scanners are frequently unavailable,and the victim’s medical and/or dental records are sometimes *** difficulties make identification ultimately depend on genetic analysis,which is more time-consuming than other identification *** this,bone fragment examination in dismemberment cases is a complex *** Anthropology can shed light on cases involving the identification of dismembered remains,which are challenging because of the number of traumatic injuries,as well as different injury patterns,on bones.

关键词： Forensic sciences forensic anthropology dismemberment human identification

计及分布式资源调节特性差异的虚拟电厂响应策略

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

电力系统自动化 2022年第18期46卷 108-117页

作者：潘明杰解大王西田上海交通大学电子信息与电气工程学院上海市200240

虚拟电厂通过对分布式资源的聚合与调控实现不同形式电能的协同优化运行,同时作为一种潜在的频率调节资源,能够较大程度地提升电力系统的灵活性。文中以分布式资源异构形成的虚拟电厂参与电力系统频率调节为应用背景,考虑不同类型资源... 详细信息

虚拟电厂通过对分布式资源的聚合与调控实现不同形式电能的协同优化运行,同时作为一种潜在的频率调节资源,能够较大程度地提升电力系统的灵活性。文中以分布式资源异构形成的虚拟电厂参与电力系统频率调节为应用背景,考虑不同类型资源的调节特性差异,设计了虚拟电厂有功功率-频率调节模式,研究并提出了分布式资源动态组合的虚拟电厂响应策略。首先,将构成虚拟电厂的分布式资源划分为正电源、负电源和储能电源3类,基于下垂特性分别建立其有功功率-频率调节模型,并考虑资源异构方式推导出虚拟电厂的综合频率调节特性。其次,根据采样得到的分布式资源实时运行状态,构建虚拟电厂的状态空间与状态轨迹,提出资源动态聚合的虚拟电厂功率响应模式与响应效果预测模型。最后,选取某35 kV变电站台区作为仿真算例,验证了典型日不同时段下虚拟电厂的响应效果,并分析了影响虚拟电厂调节能力的关键因素。

关键词：分布式资源虚拟电厂下垂特性频率调节动态聚合响应策略

COMPUTATIONAL RESEARCH ON WAVE MAKING OF MOVING WIGLEY HULL IN TIME DOMAIN

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2008年第4期20卷 469-476页

作者： YANG Xiang-hui YE Heng-kui FENG da.kui LIU Juan College of Traffic Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China Ship Information Center Beijing 100085 China

Based on Green＇s theorem, a time domain numerical model was constructed to simulate wave making phenomenon caused by a moving ship. In this article, the rankine sources and dipoles were placed on bounda.y surfaces （i.e., the ship surface and free surface）, and a time-stepping scheme was employed. Its unique characteristic is that steady state can be realized from initial value by employing the time-stepping scheme and unsteady free surface conditions. In time domain, if the results of unsteady flow problem tend to da.a stabilization after many time steps of computation, they could be regarded as the da.a of steady ones. This model could be employed to steady or unsteady problems. Theoretical reasoning and computational process of this method was described in detail The linear and nonlinear bounda.y conditions on body surface were studied, and the relative means to realize these bounda.y conditions in iterative computation were also discussed. Some proper parameters about the model of the Wigley hull were determined by many numerical tests, and their influences on wave making resistance and wave pattern were discussed. According to the comparison between numerical results and da.a available in relative references, the method used in this work is proven to be a reliable method in time domain. And the lattice reorganization in every time step computation is a feasible numerical approach.

关键词： rankine source dipole time domain Wigley hull lattice reorganization time-stepping scheme Green's theorem

In situ synthesis of Co_(3)O_(4)nanoparticles confined in 3D nitrogendoped porous carbon as an efficient bifunctional oxygen electrocatalyst

在线全文

学校读者我要写书评

暂无评论

rare Metals 2020年第12期39卷 1383-1394页

作者： Zhi-Yuan Wang Shun-da.Jiang Chan-Qin Duan da. Wang Shao-Hua Luo Yan-Guo Liu School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Key Laboratory of Dielectric and Electrolyte Functional Material-Hebei Province Qinhuangdao 066004China

The rational exploitation of non-precious metal catalyst with high activity,strong durability and low cost for the oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)is of vital importance for metalair ***,a composite of Co_(3)O_(4)nanoparticles confined in three-dimensional(3 D)N-doped porous carbon(Co-NpCs)was prepared by a simple freeze-drying and in situ pyrolysis *** effect of different dosages of Co(NO_(3))_(2)on the catalytic performance was *** Co-NpC-12%exhibits the best catalytic performance(E_(1/2)=0.78 V,better stability than 20%Pt/C)in ORR and in OER among all the as-synthesized ***,it also exhibits the best bifunctional activity(ΔE=0.849 V).The excellent properties of Co-NpCs are mainly due to the synergy between Co_(3)O_(4)and ***,a high Co_(3)O_(4)loading amount can boost the defect level of the N-doped hierarchical porous carbon and expose more active ***,the unique in situ pyrolysis guarantees a largearea contact between Co_(3)O_(4)and carbon as well as a strong C-O-Co bonding,which promotes charge transfer,avoids the peeling of Co_(3)O_(4)nanoparticles and effectively improves the stability of the *** work is expected to offer a feasible strategy to produce metal oxide/carbon nanocomposite and push forward the development of bifunctional electrocatalyst with high activity and stability.

关键词： Bifunctional electrocatalyst Co_(3)O_(4) Nitrogendoped porous carbon In situ synthesis

Diameter-controlled growth of aligned single-walled carbon nanotubes on quartz using molecular nanoclusters as catalyst precursors

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2013年第5期58卷 433-439页

作者： PENG Fei LUO da.SUN Hao WANG JinYong YANG Feng LI RuoMing YANG Juan LI Yan Beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and Applications Key Laboratory for the Physics and Chemistry of Nanodevices Peking University

Molecular nanoclusters containing Fe and Mo atoms have been used as catalyst precursors for the growth of single-walled carbon nanotubes (SWNTs) on stable temperature (ST)-cut quartz substrates by chemical vapor deposition. Attribute to the uniform catalyst nanoparticles and the confinement effect of the crystalline substrates, well-aligned SWNTs with narrow diameter distribution have been synthesized. Atomic force microscopy measurements show that the mean diameter of the nanotubes obtained by thermal decomposition of ethanol at 900°C is 0.76 ± 0.16 nm, which is the smallest among all reported results for aligned SWNTs. The mean diameter of the nanotubes increases with growth temperature. In addition to using identical nanoclusters as the catalyst precursors, the avoida.ce of annealing treatment of catalyst precursors is also a key point for obtaining SWNTs with controlled diameters. Using these identical nanoclusters as catalyst precursors and carefully tuning the growth parameters make us closer to the ultimate goal of controlling the chirality of SWNTs.

关键词：单壁碳纳米管催化剂前体控制生长纳米团簇直径分布石英衬底分子原子力显微镜