X-ray Photoelectron Spectroscopy Investigation on the Low-Temperature Degradation of 2 mol% Y2O3-ZrO2 Ceramics

2 mol% Y₂O₃-ZrO₂ polycrystals were annealed in water and under vacuum to highlight the effect of the presence of H₂O on the low-temperature degradation transformation. The specimen surfaces with monoclinic phases transformed during annealing in the different environments were analyzed by X-ray photoelectron spectroscopy with special interest on the electron binding energy change of the constituent ions of the 2 mol% Y₂O₃-ZrO₂ ceramics after the degradation transformation. It was found that no change occurred for the electron-bonding energies of core levels of zirconium ions after the transformation, whereas Y-OH bonds were formed during annealing in water. This result suggested a possibility that the preferred hydration of yttrium took place at the surface of Y₂O₃-partially-stabilized ZrO₂, which is likely to be the reason for the low-temperature degradation accelerated by the presence of H₂O.     

混流,定浆式转轮特性参数的计算机处理

本文根据混流、定浆式转轮特性多数的特点建立了一种能将高维特性多数用一个具有二阶连续导数且保形的函数给予表达的方法，它的精度高，且能方便生成满足各种用途的特性曲线。     

一种弧焊机器人实时激光扫描视觉系统

研制了一种小型高精度弧焊机器人实时激光扫描视觉系统，对其各项性能进行了测试，并进行了抗电弧光干扰试验，结果表明，此系统精度高，抗干扰能力强，检测范围宽，能广泛地应秀于机器人和自动化焊接中。     

The effect of prior austenite grain size on the transformation behaviour of C-Mn-Ni weld metal

The influence of prior austenite grain size on the transformation behaviour and microstructural development of C-Mn-Ni weld metals was investigated. It was found that increasing the grain size depressed the start temperature of grain-boundary ferrite and slightly increased the acicular ferrite start temperature. The microstructural products also changed from a boundary-dominated effect in the small grain sizes, to an intragranular-dominated effect in the large grain sizes, and at the same time, the morphology of the acicular ferrite was seen to change to a larger aspect ratio.     

提高大口径金属主镜面形精度的方法

分析了影响Ｒｉｔｃｈｅｙ－Ｃｈｒｅｉｔｉｅｎ光学系统中金属主反射镜面形精度因素，采用有限元法对立交易的加工过程及其安装进行了模拟，指出提高主镜的面形镜度，既要合理主镜材料的热处理工艺，也要对加工参数进行控制。良好的稳定化处理可以有效地消除材料内部的残余应力，保证主镜尺寸的稳定性。提高加工基准的精度，并采用组合加工镜面，可以大大提高主镜的面形精度，最后，给出了主镜的干涉仪检测结果。     

筛查基因突变的新技术——循环双脱氧指纹图谱法及其应用

建立了适用于大批量标本基因突变筛查的双脱氧指纹图谱法即ｄｄＦ。该技术民测定ＤＮＡ序列的双脱氧末端终止法及ＳＳＣＰ二者长处于一身，即只作一个双脱氧末端终止反应，然后将反应产物在与ＳＳＣＰ相同的电泳条件下进行聚丙烯酰胺凝胶电泳，这样有突变的样品不会漏检，阳性检出率高达１００％。     

Two highly specialized histone H1 proteins are the major chromosomal proteins of the sperm of the sea anemone Urticina (Tealia) crassicornis

The sperm nuclear basic proteins (SNBPs) from a sea anemone (Urticina crassicornis) have been isolated and characterized for the first time. They consist of two sperm-specific members of the histone H1 family with Mr 22,700 and 24,600. They amount to about 60--70% of the total chromosomal sperm proteins. Their amino acid composition and the primary structure of their trypsin-resistant core indicate a strong relation to histone H5 from the nucleated erythrocytes of birds and amphibians as well as to other high sperm-specific H1-like (PL-I) proteins from phylogenetically distant groups. The major presence of histone H1-like protein in the sperm of an organism belonging to such a low phylogenetic group provides experimental support to the hypothesis that SNBPs may all have evolved from a primitive histone precursor.     

一种实用的数值型伪Hash函数排序方法

本文给出一种具有实用价值的数值型伪Ｈａｓｈ函数排序方法。该方法通过尽量避免比较而直接计算定位的方式提高排序速度。测试结果表明：该算法的排序时间好于比较式排序的代表性算法Ｑｕｉｃｋｓｏｒｔ，Ｓｈｅｌｌｓｏｒｔ。与现有算法相比，该算法简洁，灵活，易于实现，适合于某些应用领域的特殊需求。     

不锈钢网架结构试验研究

对奥氏体不锈钢网架结构的物理力学性能、焊接性能加以分析，并进行了不锈钢焊接空心球节点承载力试验，确定了该种节点的受拉和受压承载能力。在此基础上，又做了不锈钢组合扭网壳模型的破坏性试验研究，试验结果与理论计算值比较，吻合较好。     

Experimental studies of new ductile coupling beams and multi-storey shear walls

The span-depth ratios of coupling beams to interconnect shear walls are generally small, so that brittle shear failure may occur and lead to reduced ductility. In order to improve the ductility of coupling beams for earthquake loading, a new type of ductile coupling beam is proposed in this paper. Along the middle depth of this beam, a slit through the entire thickness (a narrow hole) near each end and two lateral keyways along the remaining middle part of the span are made. The reductions of the stiffness under service load and the ultimate carrying capacity of the beam due to the weakening mentioned above are small and the ductility is greatly increased. Tests of 4-storey walls interconnected by coupling beams in three different constructions (monolithic beams, beams with a through-slit and new-type beams) indicated that shear walls with the new coupling beams possess the best aseismic behaviours under cyclic loading. The proposed new coupling beam has been used in a high-rise building.