Under appropriate cooling condition, intcrfacial phase appeared between α and β phases in Ti-5Al-2M0-3Zr alloy. Its thickness could reach 100 nm. The interfacial phase was either single layer structure or double layer structure. The monolithic layer adjacent to 3 phase was indentified as fee structure with relationship （110）β// （001）m, [11$\\mathop 1\\limits^{{\\rm{ - - }}} $]β /[110]m. The striated layer adjacent to a phase was indentified as hep with twin relationship {10$\\bar 1$1}<1$\\bar 0$12> to α. Thus, the study provided a new experimental fact for the controversial topic on structure of striated layer. Chemical composition of interfacial phase varied slightly with heat treatments, but always between that of α and β phases

一、存在M－M键的化合物称为簇合物（cluster) (M为3以上） 二、羰基原子簇:Rh6(CO)16, Co4(CO)12（0价）（低价） 三、卤化物类原子簇: Mo6Cl84+ （+2价） （高价）

通过快速结晶法制得了2.875%C+1.3%Cr的白口铸铁粉末。然后用热等静压方法在温度720℃,压力150MPa将粉末压3h得到了高密度的粉末压块。压块经63%的变形后,显微组织由晶粒尺寸为1～3μm的铁素体和直径小于3.5μm的渗碳体颗粒组成。在670～770℃的温度区间和3×10-4～1s-1的应变速率范围,对材料在热等静压后和热等静压+63%的墩粗变形后的超塑性行为进行了研究。研究结果表明:材料在720℃和3×10-3～3×10-2s-1的应变速率下显示出低的流动应力和高的应变速率敏感性（m=0.42）

一、钢筋混凝土的缺欠 跨度为5.2m的简支梁,截面尺寸为200×450mm2,作用均布活荷载标准值q=10kN/m,均布恒荷载g=5kN/m

Electronic Commerce Prentice Hall © 2006 2 Learning Objectives 1. Define mobile commerce and understand its relationship to e-commerce. 2. Understand the mobile computing environment that supports m-commerce. 3. Describe the four major types of wireless telecommunications networks

典型习题解析 1图示直杆截面为正方形,边长a=200m,杆长L=4m,F=10k,材料密度 p=20k/m3.考虑杆的自重,计算1-1和2-2截面轴力,并画轴力图

由mn个数排成m行n列的数表称为矩阵，记作 A．其中aij称作矩阵 A的第i行第 j列的元素．

Due Sept 17. 2002 1. a) Mean free path 2= kBI d-p where k=1.38×102,T=293K,p=10mTor=133Pa,d=1A=100m 38×10-3(293 6.9cm ford=1A Jr(m)(332)017mfrd=2A b) Use the ideal gas law pV=nkB T 1.33Pa vk7(138×102X90)33×10m-33×10cm3

第1讲光纤通信概述 1-1光纤、光波;0.85m1.31μm,1.55μm 1-2答:①传输衰减小,传输距离长。 ②频带宽,通信容量大。 ③抗电磁干扰,传输质量好。 ④体积小、重量轻、便于施工。 ⑤原材料丰富,节约有色金属,有利于环保 ⑥易碎不易接续

1紧算子谱的特征 2紧算子构成的算子方程与共轭算子构成的算子方 程解的关系。 Freidhol1m择一定理