岩土体斜(边)坡滑坡发生的机理

根据滑坡发生的初始条件、滑坡成因及方式表象,对常见的蠕变倾覆滑坡、卸荷滑坡、震动液化平推滑坡、潜蚀塌陷滑坡、溶蚀下陷滑坡、孔隙水压浮动滑坡和人工切蚀或冲(浪)蚀—加载滑坡等机理进行了分析.     

Dielectric and piezoelectric properties of Pb(Ni1/3Nb2/3)O3–PbTiO3–PbZrO3 ceramics modified with bismuth and zinc substitutions

The dielectric and piezoelectric properties of the (Pb_0.985Bi_0.01)(Ni_1/4Zn_1/12Nb_2/3)_x- (Zr_σTi_1-σ)_1-xO₃ piezoelectric ceramic system (0.2 ≤ x ≤ 0.7, 0.1 ≤ σ ≤ 0.9) were systematically investigated. The results showed that, after poling, the dielectric constant, ε ₃₃ ^T , increased for the tetragonal compositions but decreased for the rhombohedral compositions. Furthermore, high values of ε ₃₃ ^T and piezoelectric modulus, d ₃₁ were found for the compositions along the extension of the morphotropic phase boundary. The highest values of the planar electromechanical coupling factor, K _p, and the piezoelectric modulus, d ₃₁, were found to be 0.70 and − 274 × 10^-12 C N^-1, respectively. The Curie temperature, remanent polarization, coercive field and the lattice constants of the a and c axes in relation to the Pb(Ni_1/3Nb_2/3)O₃ content and the Zr/Zr + Ti ratio were also determined. This revised version was published online in November 2006 with corrections to the Cover Date.     

Hydrogen Permeation and Diffusion in Amorphous Alloy Ni_(68)Cr7_Si_8B_(14)Fe_3 at Elevated Temperature

The behaviour of hydrogen permeation and diffusion in amorphous alloy Ni68Cr7Si8B14Fe3 hasbeen investigated by an ultrahigh vacuum gas permeation technique. A comparison experimentwas carried out between the as-quenched and annealed States (400℃/2h) of the amorphousalloy. The results show that, for both states of the amorphous alloy in the temperature rangeof 200～350℃, the diffusivity and permeability of hydrogen are in agreement with Arrheniusrelationship, there does not exist H-trapping effect, and the activation energies of diffusion andpermeation almost keep the same.     

电子聚合物基体碳纳米管复合材料研究进展

电子聚合物是一种新型的功能材料，碳纳米管具有优异的力学性能和独特的电学性能等，是聚合物基体复合材料的理想增强体，按不同电子聚合物基体类型进行了归纳，评述了电子聚合物基体碳纳米管复合材料的制备，性能和应用等情况。     

钠冷快堆中喷雾钠火的计算分析

根据钠冷快堆中喷雾钠火的特点建立了理论模型，编制了SSPRAY程序。该程序模拟钠喷雾燃料过程中钠滴的运动、钠和氧气的燃烧反应、热量传递和质量传递等瞬态过程。用该程序计算了气体和墙壁温度、气体压力、氧气摩尔份额、喷雾流燃烧速率和热量热递速率等主要参数。利用AI实验数据和美国SPRAY－3A的计算结果对程序进行了验证，结果符合较好。     

电沉积Ni-W合金镀层的X射线光电子能谱分析

采用X射线光电子能谱（XPS）对电沉积Ni-W合金镀层表面膜进行了分析。研究结果表明，Ni-W合金镀层表面存在一层薄的氧化膜，而钨的氧化作用远大于镍，Ni-W合金镀层中W含量的提高对耐蚀性起决定作用。     

磨损自补偿添加剂在成品油中的摩擦学效应

利用四球试验机考察了二聚酸－3－氯－2－羟基丙单酯（DAE）在4种成品油中的摩擦学性能。试验结果表明，DAE添加剂在L－HM68液压油和L－DAB100空压机油中具有良好的适应性，使其承载能力增强，摩擦系数降低及耐磨性增强；DAE在L－CKE涡轮蜗杆油中使耐磨性增强；DAE在L－CKC150齿轮油中虽使承载能力提高，减磨性增强，但有使耐磨性减小的趋势，说明DAE在不同的油中有不同的性能。     

Alkali-metal Na Adsorption and Promoted Oxidation on Si(100)2×1 Surface

The alkali-metal Na adsorption on Si(100)2×1 surface and its promoted oxidation and Si oxidegrowth have been investigated by means of thermal desorption,work function,Auger electronspectroscopy and photoemission electron spectroscopy.The experimental data showed that therewas a new state,interface electron state,near the Fermi level after the deposition of Na atoms.It wasfound that the presence of Na always caused an increase of the oxygen initial uptake whereas thepromotion of Si oxide growth was observed only at the coverage of Na greater than 0.5 ML.A newmechanism of Na-promoted Si oxide growth is suggested in this paper.     

自升式平台深水化改造的新模式及其可行性分析

针对我国现有自升式平台存在的不能满足深水域勘探开发的要求以及造价过高等问题,提出一种自升式平台深水化改造新模式——分体坐底自升式平台,在基本不改变原有平台结构的基础上,通过增加可沉浮平台下体,使作业水深增加50m以上,而造价比同工作水深的常规自升式平台低得多。文章介绍了该分体坐底自升式平台的结构方案、作业工况及操作程序,分析了该平台的技术可行性和经济可行性,并提出了深入研究和具体实施需要解决的问题。     

-50℃用20MnMoD钢锻件及其焊接接头性能

研究了-50℃的20MnMoD钢锻件及其焊接接头在不同热处理状态时的综合力学性能。结果表明,-50℃的20MnMoD钢锻件具有良好的低温韧性,可与-50℃级正火型低温压力容器钢15MnNiNbDR配套使用。