谈介质中BIOT SAVART‘S定律的应用

用矢量场理论，推导出介质中Ｂｉｏｔ ｓａｖａｒｔ’ｓ定律的基本形式，论述了介质中应用该定律的条件及内涵，进而拓宽了该定律的适用范围。     

一类二阶非线性泛函微分方程的振动性

在二阶泛函微分方程振动理论研究成果的基础上,利用Riccati变换、微分与积分、不等式的放大与缩小等方法,讨论了更一般的一类二阶非线性泛函微分方程的振动性,得到了该类方程所有解振动的新的充分条件,改进了已有文献中的某些条件,推广了文献中的一些已知的结果。     

大型非线性偏泛函微分方程的不变集和吸引性

对一类大型非线性偏泛函微分方程的渐近行为进行研究,利用非负矩阵性质和适当的分析技巧,建立了判断其不变集和吸引性的充分条件.     

基于单片机的磁滞回线测试系统

探讨了基于凌阳单片机的铁磁材料磁滞回线测量的基本原理及其硬、软件设计实现.测试表明,该测量系统具有工作性能稳定可靠,测量精度高等特点.     

3D virtual reconstruction of the Pleistocene cheetah skull from the Tangshan, Nanjing, China

The development of computer tomography and image processing has made it possible to establish virtual 3D reconstruction and non-invasive dissection of fossil specimens. We used these methods to reconstruct a virtual 3D skull of a Pleistocene cheetah skull from the Tuozi cave, Tangshan, Nanjing, and virtually dissected it for anatomic studies, and measured the volumes of different parts of the endocranium. The endocranium of the cheetah skull has showed that its frontal sinus is beehive-like, the frontal lobe of cerebra is relatively large but the temporal lobe is relatively small, its cerebral sulcus and gyrus are more complicated than those of the domestic cat, similar to those of the domestic dog, but simpler than those of giant panda, pig, cattle and horse. The technology of virtual 3D reconstruction and non-invasive dissection of fossil specimens can extend the morphological study from the exterior to the interior, and it can also help to study fragile specimens and virtually backup rare and precious specimens.     

电流强度的相对论效应

本文讨论了关于电流方向习惯说法存在的问题,并从相对论的观点给以解释。     

FeRhN原子簇几何结构和磁性

采用离散变分局域自旋密度泛函方法，对ＦｅＲｈＮ原子族（Ｎ＝２－６，１２，４２和５４）的几何结构和磁性进行了系统研究。发现小ＦｅＲｈＮ原子簇几何结构的相对稳定性同原子簇中的相邻原子间成键数目成正比，小ＦｅＲｈＮ原子簇的在态倾向于有较多近邻键合的高维几何结构。所讨论的所有ＦｅＲｈＮ原子簇比相应的ＲｈＲｈＮ原子簇的磁矩都大。因此，用Ｆｅ替换Ｒｈ后，铁确实能提高原子簇的磁矩。这个结论同相关的实验结果相一致     

关于数论函数δ（n）的一个方程

对于正整数n，设δ（n）是n的不同约数之和．该文证明了：方程δ（1）δ（n）＋δ（2）δ（n-1）＋…＋δ（n）δ（1）=nδ（n）仅有正整数解n=1和2.     

Reliability Estimations of Control Systems Effected by Several Interference Sources

In order to establish the sufficient and necessary condition that arbitrarily reliable systems can not be constructed with function elements under interference sources, it is very important to expand set of interference sources with the above property. In this paper, the models of two types of interference sources are raised respectively: interference source possessing real input vectors and constant reliable interference source. We study the reliability of the systems effected by the interference sources, and the lower bound of the reliability is presented. The results show that it is impossible that arbitrarily reliable systems can not be constructed with the elements effected by above interference sources.     

磁位计在交流大电流测量中的应用

基于对磁位计特点的分析，介绍了以磁位计为采样元件的交流大电流自动测量方法．安匝模拟试验结果表明，该测量装置线性度好、精度高，误差不超过0．5％．