排序方式: 共有73条查询结果,搜索用时 31 毫秒
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Li Yang Zhi-Chun Zhong Yi-Chun Zhou Wang Zhu Zhi-Biao Zhang Can-Ying Cai Chun-Sheng Lu 《Acta Mechanica Sinica》2016,32(2):342-348
In this paper, acoustic emission (AE) and digital image correlation methods were applied to monitor interface cracking in thermal barrier coatings under compression. The interface failure process can be identified via its AE features, including buckling, delamination incubation and spallation. According to the Fourier transformation of AE signals, there are four different failure modes: surface vertical cracks, opening and sliding interface cracks, and substrate deformation. The characteristic frequency of AE signals from surface vertical cracks is 0.21 MHz, whilst that of the two types of interface cracks are 0.43 and 0.29 MHz, respectively. The energy released of the two types of interface cracks are 0.43 and 0.29 MHz, respectively. Based on the energy released from cracking and the AE signals, a relationship is established between the interface crack length and AE parameters, which is in good agreement with experimental results. 相似文献
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配体3,5-二(2-吡咯)吡唑(HL)与二硝酸根桥联双钯配合物在溶液中通过配位作用形成了一系列吡唑基双钯(Ⅱ,Ⅱ)夹子[Pd2(bpy)2L2]2+(1)、[Pd2(dmbpy)2L2]2+(2)和[Pd2(phen)2L2]2+(3)(bpy=2,2''-联吡啶,dmbpy=4,4''-二甲基-2,2''-联吡啶, phen=1,10-菲咯啉)。运用1H NMR、13C NMR、 ESI-MS和X射线单晶衍射等测试手段对1~3的结构进行了表征。其晶体结构中存在弱的Pd…Pd键(0.303~0.313 nm)相互作用,通过分子间的氢键作用形成一维二重螺旋结构,可作为一种新颖的Suzuki-coupling反应的高效催化剂。 相似文献
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LAN Ting-Yan CHEN Jian-Xin WEI Chun-Xia LI Zhong-Shui HUANG Yuan-Biao ZHANG Wen-Jie ZHANG Zhi-Chun 《结构化学》2006,25(3)
A Keggin-type tungstohosphate compound [CuI(2,2'-bipy)2]3[PWVI12O40] 1 (bipy = bipyridine) was prepared by the hydrothermal method for the first time. Single-crystal X-ray diffraction revealed that 1 (C60H48Cu3N12O40PW12) crystallizes in the monoclinic system, space group P21/c with a = 16.9837(10), b = 17.9732(13) c = 27.8701(13)(A), β = 96.1039(10)°, V = 8459.2(9)(A)3, Mr = 4004.89, Z = 4, Dc = 3.145 g/cm3, μ = 17.089 mm-1, F(000) = 7208, S = 1.005, the final R = 0.0469 and wR = 0.0827 for 10807 observed reflections (I > 2σ(I)). Compound 1 consists of one discrete normal Keggin polyanion [PWVI12O40]3- and three isolated coordinated cat- ions [CuI(2,2'-bipy)2]+. Significantly, there exist three crystallographically independent asymmetric reduced copper (I) centers in 1. Furthermore, the compound shows strong photoluminescence property in solid state at room temperature. 相似文献
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Xin-Wei Zha Zhi-Chun Zou Jian-Xia Qi Hai-Yang Song 《International Journal of Theoretical Physics》2013,52(6):1740-1744
A theoretical scheme for bidirectional quantum controlled teleportation is presented using the entanglement property of five-qubit cluster state. This means that Alice wants to transmit a entangled state of particle a to Bob and Bob wants to transmit a entangled state of particle b to Alice via the control of the supervisor Charlie. 相似文献
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ZHANG Li ;CHEN Jian-Xina ;ZHANG Wen-Jie ;LI Ai-Ke ;ZHU Mei-Ping ;LIN Xin-Rong ;YU You-Yi ;ZHANG Zhi-Chun 《结构化学》2009,28(12):1666-1670
The title compound,bromo-(2-diphenylphosphino-N-(2-oxybenzylidene)-aniline)- nickel,was synthesized by simple condensation of 2-diphenylphosphino-N-(2-oxybenzylidene)- aniline with NiBr2·6H2O and characterized by elemental analysis,IR spectra and single-crystal X-ray diffraction. The crystal belongs to the triclinic system,space group P1 with a = 9.756(2),b = 10.232(2),c = 13.313(3)A,α = 95.09(3),β = 102.48(3),γ = 95.45(3)o,V = 1283.5(4) A^3,C29H23BrNNiO2P,Mr = 587.07,Z = 2,Dc = 1.519 g/cm^3,λ(MoKα) = 0.71073 A,F(000) = 596 and μ = 2.402 mm^-1. The structure was refined to the final R = 0.0408 and wR = 0.0965 for 4507 observed reflections (I 〉 2σ(I)). Intermolecular π-π interactions (with distances of about 3.705 A) are pronounced in the crystal structure. Under methylaluminoxane (MAO) activation,the title compound was able to catalyze norbornene polymerization,exhibiting good polymerization activities. 相似文献
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A new pseudo three-dimensional framework structure of the title compound {[CuⅡ(1,10-phen)]2[PMoⅥ11MoⅤO40]}[CuⅠ(C8N4H6)(C9H6NO)(H2O)](1) has been prepared by the hydrothermal method for the first time and characterized by elemental analyses,X-ray single-crystal diffraction and IR spectra.1 consists of two building blocks,one {[CuⅡ(1,10-phen)]2[PMoⅥ11MoⅤO40]} and one [CuⅠ(C8N4H6)(C9H6NO)(H2O)] coordinated group.Singlecrystal X-ray diffraction revealed that 1 crystallizes in the monoclinic system,space group P2/c with a=13.498(4),b=12.890(3),c=21.465(8),β=97.314o,V=3704(2)3,Mr=2693.61,Z=2,Dc=2.415 Mg/m3,μ=2.915 mm-1,F(000)=2562,S=1.009,the final R=0.0583 and wR=0.1406 for 5129 observed reflections with I2σ(I).Furthermore,compound 1 shows strong fluorescent properties in the solid state at room temperature.The electrochemical behavior of 1 has also been studied by cyclic voltammograms. 相似文献
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环路热管是一种靠蒸发器的毛细芯产生毛细力来驱动回路运行,利用工质相变来传递热量的高效传热装置.本文研制了一套不锈钢外壳,以氨为工质的小型平板式环路热管(mLHP),并着重研究其在不同热负荷条件下启动特性及变工况条件下的稳定运行特征,通过对平板 mLHP 运行机制理论分析,建立了合理的数学物理模型,实现了对整个系统动态仿真.实验结果表明,小型平板式 mLHP 可以在不同热流密度下快速启动,并具有良好的适应变热负荷能力.实现了平板式 mLHP 系统中各个主要节点的压力、温度和流量的动态仿真,与实验数据对比,仿真结果和实验数据吻合较好,加深了对 LHP 系统运行机理的理解.通过实验和动态仿真结果对系统结构进行优化,为应用在电子器件散热的高效率平板式 mLHP 系统的设计与优化提供依据. 相似文献
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