润滑油中微细碳粉颗粒对45~#钢接触疲劳寿命影响的研究

在20~#机械油中添加适量的微细碳粉硬质颗粒可以提高45~#钢(调质处理,HB=300)的接触疲劳寿命。含碳粉油样的调配比例(wt)有两种,即碳粉:分散剂:纯20~#机械油=1:1:100和2:1:100。研究结果表明,在给定的试验条件下,45~#钢于这两种油样中的接触疲劳寿命分别为纯20~#机械油中的2.6倍和5.0倍。作者还就碳粉的作用机理进行了考察,指出添加碳粉之所以能够提高试件的接触疲劳寿命,原因在于它使润滑油的粘度增大及其渗入到疲劳裂纹中减缓了裂纹的扩展     

Theoretical Studies on the Hydrogen Bond Transfer and Proton Transfer between Anamorphoses of the Dihydrated Glycine Complex

The conversion between anamorphoses of the dihydrated glycine complex was studied by means of B3LYP/6-31++G**. It was found that proton transfer was accompanied by hydrogen bond transfer in the process of conversion between different kinds of anamorphoses. With proton transfer, the electrostatic action was notably increased and the hydrogen-bonding action was evidently strengthened when the dihydrated neutral glycine complex converts into dihydrated zwitterionic glycine complex. The activation energy required for hydrogen bond transfer between dihydrated neutral glycine complexes is very low (6.32 kJ·mol-1); however, the hydrogen bond transfer between dihydrated zwitterionic glycine complexes is rather difficult with the required activation energy of 13.52 kJ·mol-1 due to the relatively strong electrostatic action. The activation energy required by proton transfer is at least 27.33 kJ·mol-1, higher than that needed for hydrogen bond transfer. The activation energy for either hydrogen bond transfer or proton transfer is in the bond-energy scope of medium-strong hydrogen bond, so the four kinds of anamorphoses of the dihydrated glycine complex could convert mutually.     

A hyperstructural approach to essentiality

Let M be a hypermodule over a hyperring R such that the intersection of any two subhypermodules of M, is a subhypermodule of M. We introduce the concept of an essential subhypermodule in M relative to an arbitrary subhypermodule T of M, which is called a T-essential subhypermodule of M. Our main goal in this work is to investigate properties of (relative) essential subhypermodules. We apply this concept to introduce extending hypermodules. Examples are provided to illustrate different concepts.     

二维连续型随机变量函数的密度公式及计算

本文直接利用积分推导出了二维连续型随机变量函数Z=g（X，Y）的密度函数的计算公式并进行了推广．同时介绍了比文献[1]更简捷的确定积分限的方法．     

Two Methods for Extending Quantum Key Warehouse

Because the rates of quantum key distribution systems are too low, the interleaving technique and interpolation technique are used to extend the capacity of the quantum key warehouse to increase the quantum key rates of quantum secure communication systems. The simulation shows that the interleaving technique and interpolation technique can extend random sequences and that their randomness are invariable. The correlative theory and technique of digital signal processing is an effective method of extending the quantum key warehouse. Translated from Chinese Journal of Quantum Electronics, 2005, 22(1) (in Chinese)     

应用费希尔信息量评价函数的波前编码系统设计

在兼顾图像恢复能力的基础上,将不同物距下点扩展函数相似性的评价函数费希尔信息量(Fisher Information,FI)应用到波前编码实际光学系统相位板的优化设计中。在焦距和孔径之比为3、有效焦距为100 mm的无穷远成像的双胶合系统的基础上,设计得到了双胶合-波前编码系统。通过解码前后的点扩展函数模拟和实验结果表明,该系统在5 m到无穷远的物距范围内很好地调制了系统的点扩展函数,使得它对物距不敏感。最后通过对位于5 m,10 m和15 m的三人分别进行传统双胶合成像和双胶合-波前编码系统的成像实验对比,有力地证明了双胶合系统的清晰成像的物距范围从10 m到无穷远扩展到5 m到无穷远,这使得光学系统景深得到很大的延拓。     

Synthesis and Structural Characterization of a Cyano-bridged 1-D Lanthanum(Ⅲ)-iron(Ⅲ)Complex [La(DMSO)5(H2O)](μ-CN)2[Fe(CN)4]·H2O

A new lanthanumⅢ-ironⅢ complex [La(DMSO)5(H2O)](μ-CN)2[Fe(CN)4]·H2O 1 (DMSO=dimethylsulfoxide) has been prepared by a facile approach, ball-milling method, and characterized by X-ray diffraction. The crystal belongs to monoclinic, space group P21/n with a=9.7125(3), b=21.5336(7), c=14.3804(5) (A), β=93.242(3)°, C16H34FeLaN6O7S5, Mr=777.55, V=3002.8(2)(A)3, Z=4, Dc=1.720 g/cm3, S=1.053, μ(MoKα)=2.278 mm-1, F(000)=1564, R=0.0490 and wR=0.1270. The crystal structure analysis of 1 reveals a slightly distorted squareantiprism eightfold-coordinated La(Ⅲ) ion and a 1-D zigzag chain structure extending through the Fe-CN-La-NC-Fe linkages. The [La(DMSO)5(H2O)](μ-CN)2[Fe(CN)4] species are held together via hydrogen bonds to form a three-dimensional framework.     

非线性三阶边值问题反对称变号解的无穷可解性

利用Krasnosel′skii不动点定理及延拓正(负)解的方法,证明了一类非线性三阶三点边值问题,当其非线性项满足某些假设条件时,具有无穷多个反对称变号解.     

The analysis of the number of fixed points in the key extending algorithm of RC4

The probabilities of the state transitions of the initial value So in the S table of RC4 are described by a kind of bistochastic matrices, and then a computational formula for such bistochastic matrices is given, by which the mathematical expectation of the number of fixed points in the key extending algorithm of RC4 is obtained. As a result, a statistical weakness of the key extending algorithm of RC4 is presented.