共搜索到27370条信息,每页显示10条信息,共2737页。用时:0小时0分0秒359毫秒
面由1条竖直线与抛物线的一半构成,竖线长度为h,抛物线顶点为下表面的末端.由于规定相变材料体积不变,据以上参数可将唯一地确定外壳上表面的长度以及抛物线的形状.通过选取侧面竖线长度h/H为0.1~1.0,可得9种不同的改进的外壳结构(h/H=1时为基准外壳结构). 图6 优化结构的管壳式相变储热单元 Fig. 6 Shell-and-tube latent heat thermal energy...避开了基准管壳式储热单元中自然对流微弱的角落死区. 图7 h/H=0.9时优化结构的储热单元中的相界面演化 Fig. 7 Evolution of the melting front in the optimized shell-and-tube latent heat thermal energy storage unit with h/H=0.9 图8 h/H=0.5时优化结构的储热单元中......
-clusters during rapid solidification process of liquid metal Al [J]. Science in China Ser G, 2005, 48(1): 101-112. [18] MARTIN T P, NAHER U, SCHABER H. Evidence for octahedral shell structure... Formation and evolution properties of clusters in liquid metal copper during rapid cooling processes YI Xue-hua(易学华)1, 2, LIU Rang-su(刘让苏)1, TIAN Ze-an(田泽安)1, HOU Zhao-yang(侯兆阳)1, LI Xiao-yang(李晓......
bonding between the rigid metal hydroxide particles and LLDPE matrix should be arise from the entanglement of LLDPE molecular chains and organic layer shell of metal hydroxides. The uniform dispersion...J. Cent. South Univ. Technol. (2008) 15: 779-785 DOI: 10.1007/s11771-008-0144-2 Flame retardancy effect of surface-modified metal hydroxides On linear low density polyethylene KONG Xiang-jian(孔祥建......
Characteristics of shell thickness in a slab continuous casting moldDi-feng Wu1) ,Shu-sen Cheng1) ,and Zi-jian Cheng2) 1) School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China 2) Steelmaking Plant,Jiuquan Iron and Steel Co. Ltd.,Jiayuguan 735100,China摘 要:The key to reduce shell breakout......
alloy was fabricated by mechanical mixing method, and the SiCp/Al composite billet was formed by thixo-forging to manufacture the electronic packaging shell. The microstructure of the produced part was investigated. Two different thixo-forging procedures for manufacturing electronic packaging shell were analyzed. The results show that after being heated to 600℃ and held for 3 h, SiCp has good......
Metal Dusting-Mechanisms and Preventions () 摘要:Metal dusting attacks iron, low and high alloy steels and nickel-or cobalt-base alloys by disintegrating bulk metals and alloys into metal particles... mechanism is still not well understood. Current methods of protection against metal dusting are either directed to the process conditions-temperature and gas composition-or to the development of a dense......
Spin-Relaxation of NiO Encapsulated Gd2O3 Core–Shell NanoparticlesA.Rajesh1,M.Manivel Raja2,K.Gurunathan11. Department of Nanoscience and Technology,Science Block,Alagappa University2. Defence Metallurgical Research Laboratory摘 要:Nickel oxide encapsulated gadolinium oxide(Gd2O3/NiO) core–shell nanoparticles(Nps) has been synthesized by polyol method......
by mechanical alloying was studied, and the absorption rate equations at different absorption steps were founded by using shell and shrinking core model. Moreover, the factors influencing the reaction process were discussed. The results show that the hydrogen absorption mainly includes surface decomposition controlling step and shell diffusion controlling step. In the beginning of the reaction, surface......
Strain in solidifying shell of continuous casting slabsGuosen Zhu, Xinhua Wang, Huixiang Yu, and Wanjun WangMetallurgical Engineering School, University of Science and Technology Beijing, Beijing 100083, China摘 要:<正> Two-dimension unsteady heat transfer model was applied to obtain the surface temperature and the shell thickness of continuous......
Electrorheological Particles Composed of Polyaniline Core and BaTiO3 Layer Shell魏建红摘 要:Composite particles consisting of polyaniline( PAn) core and barium tilanate ( BaTiO3) Layer shell were synthesized. The PAn-BaTiO3 composites particles were characterized with TEM and XRD. The dielectric behavior of particles was tested and the electrorhcologicak(ER......