轻型汽车后桥半轴断裂件的组织及断口特征

采用光学显微镜和扫描电子显微镜等手段，对某轻型汽车40Cr后桥半轴断裂件的组织及断口特征进行了分析结果表明：半轴在调质处理时的淬火温度不够高，使其表层和心部组织中存在较多的铁素体相，造成了工件最终的硬度和疲劳强度不足，导致半轴在使用中发生扭转疲劳断裂．     

国内锶的光度分析进展

对国内锶的光度法测定的近年进展概况作了评述,主要涉及自1984年到2006年间在各类显色剂的使用,以及在锶的光度测定中应用催化动力学反应及化学计量学方法等内容,引用文献61篇。     

卤素离子触发亚铁四面体笼的自旋状态转换

合理构筑了3个具有固态自旋交叉特性的亚铁四面体笼状化合物1~3。单晶X射线衍射分析证实了化合物是由6个咪唑席夫碱配体和4个亚铁离子组装形成的边导向封顶胶囊结构。金属中心占据四面体的顶点,而配体组成了四面体的边。这些笼状化合物的内部空腔被咪唑基团环绕,而外部则被取代苯环包围。一个阴离子客体被限域在笼状化合物空腔内,并与笼状化合物主体产生较强的相互作用。当在笼状化合物的乙腈溶液中加入卤素离子（Cl^-和Br^-）时,溶液的颜色和MLCT峰强度会发生明显变化,表明亚铁四面体笼状化合物的自旋状态由低自旋向髙自旋发生了转换。     

香菇生物质基氮掺杂微孔碳材料的制备及其在超级电容器中的应用

采用简易浸泡法和一步碳化/活化法制备香菇生物质基氮掺杂微孔碳材料(NMCs),利用扫描电子显微镜(SEM)、透射电子显微镜(SEM)、X射线衍射(XRD)和X射线光电子能谱(XPS)对材料的结构形貌进行表征,并研究了其超级电容特性。测试结果表明,NMCs的微孔比表面积高达1 594 m~2·g~(-1),且拥有更高数量的含氮官能团,其吡啶型含氮官能团比例也有所提高,展现出优异的超级电容特性。在0.5 A·g~(-1)的电流密度下,其比容量高达325 F·g~(-1),当电流密度上升到20 A·g~(-1)时,其比电容仍然高达180 F·g~(-1),表现出优异的倍率性能;同时,在5 A·g~(-1)的电流密度下,电极经历5 000次充放电循环后具有97.7%的比容量保持率,展现出优异的循环稳定性。这主要归因于NMCs超高的微孔比表面积和丰富的含氮官能团。     

通信网络动态优化与控制研究

引入现代控制科学,建立了一般通信网络的状态控制模型与目标控制模型,利用庞特李亚金极大值原理,研究通信网络最优控制的基本条件、本质意义与一般实现途径,证明了哈密尔顿函数协状态变量稳定解的性质及其在通信网动态优化与控制中的作用与地位。     

Effect of Temperature on the Void Growth in Pure Aluminium at High Strain-Rate Loading

With the environment temperature varying from 273 K to 773 K, the dynamic process of void growth in pure aluminium at high strain-rate loading is calculated based on the dynamic growth equation of a void with internal pressure. The result shows that the effect of temperature on the growth of void should be emphasized. Because the initial pressure of void with gas will increase and the viscosity of materials will decrease with the rising of temperature, the growth of void is accelerated. Furthermore, material inertia restrains the growth of void evidently when the diameter exceeds 10 μm. The effect of surface tension is very weak in the whole process of void growth.     

Measurement and Analysis of Spall Characteristics of High-Pure Aluminium at One-Dimensional Strain Loading

With an impact velocity varying from 196.9m/s to 317.9m/s and ratios of flyer/sample thickness of 2：4 and 3：6, the free-surface velocity profiles of the shock compressed high purity aluminium （HPA 99.999%） samples are measured with a velocity interferometer system for any reflector. Based on the vibrating features of the velocity profiles, the damage behaviour of HPA is analysed. The results indicate that the vibrating amplitude increases with increasing shock stress, and the subsequent reverberations describing the spall become more obvious. When the shock stress in the material is below a critical or smaller than the threshold level, the free-surface velocity profile replicates virtually the form of the compression pulse inside the sample. When the impact stress exceeds a critical value （1.4 GPa）, the micro damage would appear, and the free-surface velocity profile changes significantly, showing a series of short-duration reverberations in the profile. When the impact stress exceeds the threshold of damage, a compressive disturbance called the ＂spall pulse＂ appears in the free-surface velocity profile, and the subsequent reverberation becomes regular again. The measured spall strength of HPA is much higher than those of commercially pure aluminium reported in many references. In addition, the strength of HPA is similar to that of single-crystal aluminium.     

VCSEL with reticular electrode and larger emitting aperture and its optoelectronic characteristics

The enlargement of the emitting aperture is usually one of the important methods of increasing vertical- cavity surface-emitting laser （VCSEL） optical output power. However, in a VCSEL with a larger aperture, the inhomogeneity in the injected current often causes inhomogeneous or even no emission. To solve this problem and to increase VCSEL output power, as well as to improve its thermal characteristics, we develop a new type of injected VCSEL with a larger aperture and a reticular electrode, where the conventional circular injection electrode of the P side is turned into a reticular one, and the heat sink is on the N side. The tests of the new VCSEL show an improvement in homogeneity in not only the injected current but also the emission intensity. The optical output power is also considerably increased, and the device optoelectronic performance is improved.     

含有异噁唑环的β-氨基酮的合成及其抗糖尿病活性的初步研究

为了寻找新型高效低毒的抗糖尿病分子,由Mannich反应一步合成了15个新的含有异噁唑结构单元的β-氨基酮,制备方法简便、反应条件温和、产品易纯化,收率为51.2%～89.3%.所得化合物结构均通过1HNMR,13CNMR,ESIMS和HRMS表征.生物活性实验结果表明,在低浓度范围,目标分子对蛋白质酪氨酸磷酸酶1B和α-葡萄糖苷酶抑制活性不高,但对过氧化物酶体增殖物激活受体的激动活性强度中等,其中化合物1-(3,4-二氯苯基)-3-(5-甲基异噁唑-3-氨基)-3-(6-甲氧基萘-2-基)-1-丙酮(15)的过氧化物酶体增殖因子活化受体(PPAR)激动活性最好,达到75.3%,值得进一步研究.还讨论了目标分子的合成条件及其结构-活性关系.     

4-(3-(4-羟基苯基) -3-氧代-1-芳基丙氨基)-N-(5-甲基异噁唑-3-基)苯磺酰胺的合成与抗糖尿病活性

由磺胺甲噁唑、对羟基苯乙酮和芳香醛反应直接合成了13个未见报道的β-氨基酮,反应选择性发生在羰基α位。产物结构通过¹H NMR、¹³C NMR、MS进行了表征。生物活性试验显示,低浓度范围,所得化合物不仅显示一定的蛋白质酪氨酸磷酸酶1B(PTP1B)和α-葡萄糖苷酶抑制活性,而且具有中等强度的过氧化物酶体增殖物激活受体反应元件(PPRE)的激动活性,8个化合物的激动活性超过40％,其中化合物11的活性达到72.7％。