添加Al_2O_3对95W-Ni-Fe合金微观组织与力学性能的影响

针对钨合金作为预制破片战斗部穿甲后的易碎性,研究了添加不同粒径Al2O3对95W合金微观组织与性能的影响.结果表明,随着添加的Al2O3粒径的减小,钨合金中钨颗粒的平均直径尺寸减小 获得的新型95W合金的静态抗拉强度和延伸率均低于传统95W合金,并且新型95W合金的强度和延伸率随着添加Al2O3初始粉末粒径的降低而增加 添加Al2O3初始粉末粒径的减小增大了新型95W合金的抗压强度 新型钨合金由于Al2O3的存在引发了大量初始裂纹并在承受冲击载荷时导致应力集中,微裂纹迅速连结并扩展后形成裂纹.     

PM Rene 95合金中夹杂物的微观力学行为

采用人工植入Al2O3夹杂物的试样,通过SEM原位观察及非线性有限元分析,研究了在单轴拉伸条件下P/MRene95合金中夹杂物与基体的相互作用机理.结果表明,不同尺寸及位置的夹杂物对拉伸进程影响不同;夹杂物/基体界面的裂纹萌生及扩展取决于界面附近基体材料的应力状态.     

链结构对聚偏氟乙烯介电性质的影响

对已商品化的粘弹、压电、介电联用谱仪进行改进,使其测试精度由1%提高到2‰。利用改进了的仪器对聚偏氟乙烯(PVDF)及偏氟乙烯(95)/氟乙烯(5)共聚物进行了介电性质研究,发现由于5%氟乙烯存在,致使共聚物较之PVDF,其链结构规整性降低,α型介电松弛消失,非晶松弛强度减弱,T_(?)升高3℃,局域松弛活化能增大5.8kJ/mol及松弛时间延长。     

Ca[（Li1／3Nb2／3）0．95Zr0．15]O3＋δ陶瓷的低温烧结

研究了ZnO—B2O3-Na2O（ZBN）玻璃及B2O3复合掺杂对陶瓷的烧结性能及微波介电特性的影响．研究表明,在990℃,掺入质量分数3wt％ZBN＋0．7wt％B2O3,陶瓷微波介电性能最佳：εt=31．8,Qf=13230GHz,τf=-5．2ppm／℃．     

有限元编程与C语言

介绍如何用Ｃ组织结构化的数据类型编写有限元分析程序，探讨在有限元建模过程中，如何生成、删除、插入单元及节点的链表，如何使用存储的动态分配，最后对Ｃ和ＦＯＲＴＲＡＮ作了比较     

Ultrafilter translations

We develop a method for extending results about ultrafilters into a more general setting. In this paper we shall be mainly concerned with applications to cardinality logics. For example, assumingV=L, Gödel's Axiom of Constructibility, we prove that if > then the logic with the quantifier there exist many is (,)-compact if and only if either is weakly compact or is singular of cofinality<. As a corollary, for every infinite cardinals and , there exists a (,)-compact non-(,)-compact logic if and only if either < orcf<cf or < is weakly compact.Counterexamples are given showing that the above statements may fail, ifV=L is not assumed.However, without special assumptions, analogous results are obtained for the stronger notion of [,]-compactness.     

Modelisation of the Association Mechanism of a Series of Huperzine Derivatives Used for Alzheimer Disease with Human Serum Albumin: Effect of the Magnesium Cation

The role of the Mg²⁺ cation on huperzine molecule binding (drugs used for Alzheimer disease) on human serum albumin (HSA) was studied by affinity chromatography. The thermodynamic data corresponding to this binding were determined for a wide range of Mg²⁺ concentrations (x). For each solute, the huperzine binding on HSA was divided into two Mg²⁺ concentration regions. For a low x value, below x_c (1.2 mM), the binding decrease with x. For x above x_c the hydrophobic effect and van der Waals interactions between the huperzine molecule and the HSA implied a decrease in its binding. These results showed that for patients with Alzheimer disease, an Mg²⁺ supplementation during treatment with these huperzine molecules can increase the active pharmacological molecule concentration.     

Chiral 1,4-Morpholine-2,5-diones. Synthesis and Evaluation as Glucosidase Inhibitors

Summary. A series of chiral 1,4-morpholine-2,5-dione derivatives were synthesized. These substrates behave as non competitive inhibitors against -glucosidase showing a moderate inhibition (Ki< 0.8mM) and were found inactive towards -glucosidase.     

Crystal structure of tetraethylammonium bis(tetracarbonylmolybdenum)-tetrathiotungstate, [EtN][(OC)MoSWSMo(CO)] and synthesis, infrared spectra, 95 Mo NMR spectra and cyclic voltammetry of new linear trinuclear Mo(W)–S carbonyl clusters containing mixed-valence metal atoms [(OC)MSM′SM(CO)]− (M, M′=Mo or W)

Four trinuclear molybdenum(tungsten)-sulfur carbonyl cluster compounds, [Et₄N]₂[(OC)₄Mo-S₂MoS₂Mo(CO)₄] (1), [Et₄N]₂[(OC)₄WS₂WS₂W(CO)₄] (2), [Et₄N]₂[(OC)₄MoS₂WS₂Mo(CO)₄] (3), [Et₄N]₂[(OC)₄WS₂MoS₂W(CO)₄] (4) have been prepared by both reaction of [M(CO)₄(S₂CNEt₂)]⁻ with M′S₄²− in MeOH and reaction of MeCN solution of M(CO)₆ with M′S₄²− in MeOH (M=Mo, W; M′=Mo, W). These complexes has been characterized by routine elemental analysis and spectroscopy and the structures of 1 and 3 have been determined by X-ray crystallography. The structure study reveals that the anion of 3 contains a heteronuclear Mo–W–S trimetallic core, [MoS₂WS₂Mo]²−, consisting of two perpendicular rhombic MoS₂W units sharing a tungsten atom. The Mo–W bond distances are 3.028(2) and 3.031(2) Å and the Mo–W–Mo angle is 176.04(5)°. The average bond lengths of W–S and Mo–S are 2.21 and 2.54 Å, respectively. The X-ray, structure, IR, CV (cyclic voltammetry) and 95 Mo NMR studies on these four cluster complexes indicated that these cluster complexes possess wide separated oxidation states of metal atoms and exhibit the charge transfer, M^L→M^HS₄ (M^L represents a low-valance metal atom and M^H a high valence metal atom), between the two different valence metallic centers in the cluster complexes. It has been found that the charge transfer, M^L→M^HS₄, in the complexes are: 1>4, 3>2, 1>3, 4>2, 1>2 and 34 implying the electron-donation ability of low-valence metal atoms in the complexes is Mo⁰>W⁰ and the electron-accepted ability of the high valence metal atoms in the complexes is Mo^VI>W^VI.     

IS—95前向链路可变化特率卷积码编码器的VHDL实现

根据IS－95前向链路标准，介绍了卷积码编码器的原理，给出了IS－95前向链路可变比特率卷积码器的VHDL设计，在MAX＋plusⅡ环境下进行了波形仿真，并下载到EPF10KLC84－3上进行了验证。