氧化铝陶瓷缺口件循环疲劳及断裂机理

用实验方法研究了Ａｌ＿２Ｏ＿３陶瓷缺口试件在循环载荷作用下的疲劳寿命。结果表明，缺口导致的应力集中效应显著降低了循环疲劳寿命；若用缺口根部最大应力为应力水平，则不同缺口半径陶瓷试件具有相同疲劳断裂规律，说明陶瓷材料的疲劳集中系数和理论应力集中系数相同。本文还分析讨论了陶瓷材料的循环疲劳寿命表达式和循环疲劳断裂机理。     

计算机自动结构解析专家系统研究─—一个新的子结构自动生成算法

为了结构的自动解析，本文定义了４１个结构片断，这些结构片断是带有键属性的。在此基础之上，利用组合数学，穷举生成一层子结构，以用于子结构／子光谱相关约束条件的生成。     

有机化合物中碳原子化学环境的分类

进行碳－１３ＮＭＲ波谱模拟的一种常用方法为线性回归，其数学模型则由已知结构所测得的化学位来建立。显然，每一数学模型仅可用于某种相似的化学环境。因此，为了进行化学环境的分类，本文提出权重层次位图法和分子连接性指数法两种方法以进行一些参数的计算，同时采用多元分析手段，如主成分分析和聚类分析，以进行多维空间数据点的显示，所得结果比较满意，从而可为碳－１３波谱模拟中回归方程的选择提供理论依据。     

An algebraic theory of object-oriented systems

The paper presents an algebraic specification of net objects. By net objects we mean those that are defined in object-oriented paradigms and those defined with nested relations in complex database models. An algebraic specification is set up that involves structures of net objects, accesses of net objects, and some features of object-oriented programming, such as multiple inheritance and polymorphism. Objects and their relationships are then characterized formally in the modeling, which utilizes the hierarchical approach in the algebraic theory of abstract data types, and is further developed by adding mechanisms from existing object systems. Categories of net objects are presented with the properties of accesses among them     

SnO2超微粒子薄膜的气敏特性研究

作者用自行设计的直流气体放电活化反应蒸发装置制备出平均粒径约为40nm的SnO_2超微粒子薄膜.研究了不同氧分压下所得SnO_2超微粒膜的形貌、结构和组成等特性,以及不同样品对各种易燃气体的气敏特性,得出了灵敏度随氧分压及灵敏度随工作温度的变化曲线.     

绿色计算机与相关标准规范

本文简述了绿色计算机相关的标准和规范。     

Protein analysis of human von Ebner saliva and a method for its collection from the foliate papillae

The lingual serous glands of von Ebner are located close to the foliate and circumvallate papillae. Saliva secreted by these glands provides the immediate environment of the taste buds, and it has been hypothesized that it modulates taste perception. The purpose of this study was to develop a technique for collection of unstimulated and stimulated saliva from human von Ebner glands. Saliva was collected under resting conditions and after application of various gustatory stimuli (sweet, sour, salt, and bitter) by insertion of periostrips into the folds of the foliate papillae of healthy human volunteers. Stimulated saliva was also collected in glass microcapillaries or micropipettes. The flow-rates of unstimulated von Ebner saliva were 2.3 +/- 0.6 (S.E.) microL/min and 4.5 +/- 1.2 (S.E.) microL/min with 1% citric acid stimulation. The protein content was 2.5 +/- 0.5 (S.E.) mg/mL. The SDS gel electrophoretic profile of von Ebner saliva revealed two protein bands of Mr 18,000 that were identified on Western blots as von Ebner gland (VEG) proteins. Although lingual lipase activity was detected at very low levels by enzyme assay, this protein was not detected on Western blots. This collection technique should prove useful for analysis of specific functions associated with secretion from von Ebner glands.     

液相颗粒包裹法制备PbNb2O6微粉的研究

本文介绍了一种采用液相颗粒包裹技术制备功能陶瓷微粉的新方法.这种方法有如下特点:(1)方法简便,不需要特殊的设备,便于扩大应用于工业生产;(2)粉体颗粒尺寸小而均匀;(3)粉体化学组成偏离小、且均匀;(4)适应性强,从双组分至十多组分的材料微粉制备均可采用;(5)特别适用于一些含有难溶组分、用液相法无法制备的材料.本工作采用这一方法,成功地制备出 PbNb_2O_6微粉,其平均腰粒尺寸<0.5μm,分散性及化学均匀性好,烧结活性高,烧结温度可以降低近100℃,瓷坯密度可达理论密度的96%以上.     

聚氧乙烯油酸酯的合成与物性

论述了合成聚氧乙烯油酸酯的较佳反应条件,探讨了不同EO加成数的聚氧乙烯油酸脂的表面物性规律。