冲击压实机在商开高速公路中的试验及应用

结合商丘至开封高速公路介绍了冲击压实机的试验工艺、结果及应用.     

On the Solvability of the Multidimensional Version of the First Darboux Problem for a Model Second-Order Degenerating Hyperbolic Equation

A multidimensional version of the first Darboux problem is considered for a model second-order degenerating hyperbolic equation. Using the technique of functional spaces with a negative norm, the correct formulation of this problem in the Sobolev weighted space is proved.     

Testing deviations from the inverse square law with a freely falling gravity gradiometer at balloon altitudes

Summary We discuss a null experiment to search for the fifth force at ranges around 10 km. It is proposed to use a three-axis gravity gradiometer to measure the trace of the Earth gravity tensor from a freely falling elevator dropped by a balloon. The main error sources are considered to some extent. Paper presented at the V Cosmic Physics National Conference, S. Miniato, November 27–30, 1990.     

科技论文摘要的写作

科技论文摘要作为二次文献，具有举要性、示导性、贮存性、传扬性及商品性等功能，具有客观性、说明性、简练性等特征；摘要的写作要求是以精练的文字高度概括地反映论文的主题、结论及有关实质性信息。在内容在述与文字长短允许的情况下，尽可能运用报道性或报道－指示性文体；要保证摘要的独立性、自含性和完整性。     

用范畴观点划分几何学

本文利用范畴知识来推广克莱因关于几何学的群论原则。其方法是:取由一些等势集合及一一对应组成的范畴来代替由集合到自身的一些一一变换组成的群,考察图形在这些对应下不变的性质与有关的量。     

一类几乎最优循环图{C_p(m,m+1,p/a)}

本文比较了循环图类{c_p(n_1,…,n_p)}和{c-p(n_1…,n_p,p/α)}的直径下界。对于p和α满足一定条件的循环图类{c_p(n_1,n_2,p/α)},本文给出了达到或几乎达到此图类直径下界的一类几乎最优循环图{c_p(m,m+1,p/α)}。     

知识管理与张謇研究特色数据库建设

以张謇研究特色数据库建设为例，简要论述了如何应用知识管理的工具和理念建设特色数据库。     

科技文献检索质量对科研工作的影响

本文对科技文献的作用，特征进行了分析。探讨了科技文献检索途径、方法及质量对科学研究活动的影响。     

Mittlere Schwingungsamplituden von OTeF 5 −

Summary Mean amplitudes of vibration for OTeF ₅ ^– have been calculated from known spectroscopic and structural data in a wide temperature range. The results are briefly discussed in comparison with those of related species.

     

Optimal control problems with applications to the elimination of substrate diffusing and convecting through immobilized enzyme

Some optimization problems concerning a substrate in a fluid are considered. The concentration of the substrate is affected by diffusion, convection, and elimination by enzymes, and the problem is to find the optimal distribution of enzymes. In this paper, the rate of elimination and the transmission coefficient are optimized. Mathematically, these problems are optimal control problems, and they are analyzed by means of Pontryagin's maximum principle.