环境空气中臭氧的催化消除

在涂有γ-Al2O3的蜂窝陶瓷上担载贵金属，以过渡金属氧化物作助剂，通过改变助剂含量及焙烧温度，寻找较佳的催化剂组成和制备条件，对活性较好的nM/MnO2/γ-Al2O3-蜂窝陶瓷和MnO2/C进行了较详细的考察。     

多功能低温试验台的研制与实验方法

针对食品冻结与解冻，隔热层及其他材料放热，电子膨胀阀特性的研究等工作以及学生教学试验，设计并研制了多功能低温试验台，重点介绍了该低温试验台的系统设计，主要功能以及一系列相关试验的结果。     

一种新的物体连续切片图象的截面三维重建

描述了一种新的截面三维重建方法,它是在截面重建法的基础上,引入仿射变换作为旋转、投影变换,利用线性插值消隐填充算法,生成物体的可视侧面,直接利用重建图象的深度信息计算可视侧面的灰度,在显示平面获得物体可视侧面的三维结构及形状信息.并可通过旋转投影变换获得物体任一可视侧面的重建显示图象.     

Sherman—Morrison公式的一个推广

Sherman—Morrison公式的条件,历史上被表述为充分条件,本文指出它的必要性,同时给出另,一等价条件且将公式中所及向量推广到矩阵。     

石灰石类的石质保护

研制了一种可逆型的石质保护剂，涂刷在大理石、红砂石、和田玉、石灰石、青石等石质上形成保护层。经过一系列实验测试，表明该保护剂具有渗透力较强、憎水、抗酸雨等性能，可使石质耐风、雨、沙、冰冻、可溶盐、日光照射、温差变化和微生物等的侵蚀。     

Synthesis and crystal structure of the trimetallic erbium tetrahydride complex [Li(THF)4][{(ButCp)2Er(μ-H)} 3-(μ3-H)]

Reaction of [(Bu′tCp)2Er(μ-CI)]2 with Bu′Li in 1:1 molar ratio in THF at -78℃, after work-up, afforded the trimetallic erbium tetrahydride complex [Li(THF)4][{(Bu′Cp)2Er(μ-H)}3(μ3-H)] (1) by β-hydrogen elimination reaction. Crystal structure determination reveals that complex 1 has discrete ion pair structure. The anion is composed of three (Bu′Cp)2Er units to form a triangle array connected by three bridged hydrogen atoms, and the fourth hydrogen atom coordinated to three Er^3 ions. The coordination num-ber for each Er^3 ion is 9.     

Sequential reaction of p-toluidine with 2,3-dichloromaleic anhydride: Synthesis and molecular structure of 2-chloro-3-p-toluidino-N-p-tolylmaleimide

The reaction of equimolar amounts of p-toluidine with 2,3-dichloromaleic anhydride in refluxing toluene affords 2,3-dichloro-N-p-tolylmaleimide (1) and 2-chloro-3-p-toluidino-N-p-tolylmaleimide (2), as the major and minor products, respectively. While increasing the amount of p-toluidine relative to 2,3-dichloromaleic anhydride yields the latter compound as the major product, the replacement of the chloro group in 2-chloro-3-p-toluidino-N-p-tolylmaleimide by added p-toluidine was not observed in refluxing toluene. Both 1 and 2 were isolated by column chromatography and characterized in solution by IR and NMR spectroscopies. The solid-state structure of 2-chloro-3-p-toluidino-N-p-tolylmaleimide was solved by X-ray crystallography. Further, 2-Chloro-3-p-toluidino-N-p-tolylmaleimide crystallizes in the monoclinic space group C2/c, a = 33.191(8) Å, b = 4.037(1) Å, c = 24.876(6) Å, = 107.050(4)°, V = 3187(1) ų, Z = 8, and d _calc = 1.362 mg/m³; R = 0.0561, R _w = 0.1246 for 2087 reflections with I > 2 (I).     

Stability of a Pivoting Strategy for Parallel Gaussian Elimination

Gaussian elimination with partial pivoting achieved by adding the pivot row to the kth row at step k, was introduced by Onaga and Takechi in 1986 as means for reducing communications in parallel implementations. In this paper it is shown that the growth factor of this partial pivoting algorithm is bounded above by _n <#60; 3 ^n–1, as compared to 2 ^n–1 for the standard partial pivoting. This bound _n, close to 3 ^n–2, is attainable for class of near-singular matrices. Moreover, for the same matrices the growth factor is small under partial pivoting.This revised version was published online in October 2005 with corrections to the Cover Date.