Valence electronic structure and cohesive property of a binary noble metal nitride

The valence electronic structure of a newly synthesized binary noble metal nitride PtN is obtained by utilizing an empirical electronic theory. The results reveal that the valence electron configuration of the nitride is: Pt 6s 0.143, 6p 1.286, 5d 3.0; N 2s 0.5694, 2p 2.4306. Such a configuration is different from that used to generate pseudopotential for the first principle calculations, and may explain why the calculated and experimental values of the bulk modulus of PtN cannot coincide. In addition, we also calculate the cohesive energy of this new phase based on the valence electronic structure, which is -674.75 kJ/mol.     

中国桃文化现象解密--读王焰安的《桃文化研究》

《桃文化研究》恰当地厘定了“桃文化”的概念,追溯了桃文化的起源、产生、衍变、发展与传播的过程,全面分析和阐述了桃文化在各个层面的深刻内涵和对社会产生的各种深远影响,是桃文化的集大成者。它对桃文化的继承和弘扬、传播和发展具有一定的认识与研究价值。     

Phylogeny reconstruction based on protein phylogenetic profiles of organisms

With the coming of the Post Genomic Era, more and more genomes have been sequenced and it has become possible to study phylogeny reconstruction at genome level. The concept of protein phylogenetic profiles of organisms is defined in this work which is used in phylogeny reconstruction by proteome comparisons. This method is more stable than the prevailing molecular systematics methods and can be used widely. It will develop very fast with the rapid progress in genome sequencing.     

Structures of rare earth-transition metal rich compounds derived from CaCu5 type

The properties of materials have a close connect ion to their crystal structures. Rare earth (R)-transition metal (T) rich compo und are the focus of investigation in the search for new hard magnetic materials . As the basis for the study of stabilized effect of the third component on the fo rmation of RT5 derivative and its influence of the occupied sites on magnetic properties, in this paper, the possible derivative compounds based on the RT5 primitive unit cell of the CaCu5 structure type formed through the ordered or disordered substitution of dumbbell pair 2T atoms for the R atoms at some sit es, and the structural relationship between the derivatives and the prototype ar e summarized.     

基于NS2的RPR带宽分配算法参数确定方法

RPR(resiliencepacketring)是一种MAC层的环网络协议,具有全双工,空间可重用,自我护的特点,IEEE正在致力于RPR标准化。带宽分配算法是整个协议(RPRDraft1.0)讨论的重点之一,在分析了RPRDraft1.0中定义的参数Lpcoef和Rampcoef对带宽分配算法效率的影响之后,分别用25种不同的关键参数配置NS2RPR模拟器,模拟经典的两种背景压力情景,综合考虑收敛时间和振荡波形可以选出最优的关键参数组合。实验结果发现Lpcoef=32且Rampcoef=64在收敛时间与振荡方面都优于草案中建议的Lpcoef=64且Rampcoef=64。     

关于Echinoconchus与Echinaria属征及时代问题的讨论

Ｅｃｈｉｎｏｃｏｎｃｈｕｓ与Ｅｃｈｉｎａｒｉａ是特征相似同产出于石炭纪地层中的腕足动物中的两个重要标准化石属。作者针对以往文献资料对该两属属征描述、插图选择、时代分布上混乱，根据自已教学、科研的经验，在分析归纳大量资料的基础上，找出了将原属Ｅｃｈｉｎｏｃｏｃｏｎｃｈｕｓ各个种重新划分其归“属”的意见。在时代分布上，两属相伴而生，均产出于石炭纪，仅Ｅｃｈｉｎａｒｉａ的个别种可出现于早二迭世。     

电场对CuZnAl合金记忆效应的影响

在热处理时加一定的静电场，研究了电场处理对ＣｕＺｎＡｌ合金记忆效应及相变的影响，实验结果表明，正电场处理使相变温度略为下降；而对马氏体相变量及单向恢复率均有提高。     

T-S离散模糊控制系统的二次稳定性研究

研究了Takagi-Sugeno离散模糊控制系统的二次稳定性问题。运用Lyapunov稳定性定理和线性矩阵不等式技术,在一个由模糊子系统的系数矩阵构成的负定矩阵中,充分考虑模糊子系统间的相互作用,得到了在并行分布补偿控制器作用下,闭环离散模糊系统二次稳定的充分条件。这些稳定性条件以线性矩阵不等式的形式给出,因而具有数值易解性。     

应变解除法原理及其在大红山铁矿地应力测量中的应用

将应变解除法应用于云南大红山铁矿的原岩地应力测量中,通过测量4个不同中段6个测点的地应力,获得大红山矿区三维地应力的如下变化规律:矿区最大、最小主应力均大致呈线性变化,矿区的最大主应力为47 MPa,方位角介于南偏西16-到52-之间,平均倾向为南34-西,近似呈南北方向,平均倾角约16-,最小倾角仅2.88-,说明该区域的地应力以水平构造应力为主,且最大主应力随深度的增加而增加;每个测点的最大剪应力均为τxy。