氮对灰铸铁初生奥氏体二次枝晶组织的影响

采用单向凝固方法研究了氮对Ｆｅ－Ｃ－Ｓｉ和Ｆｅ－Ｃ－Ｓｉ－Ｍｎ灰铸铁初生奥氏体二次枝晶组织的影响，结果指出，氮使Ｆｅ－Ｃ－Ｓｉ－Ｍｎ灰铸铁初生奥氏体二次臂间减小，二次枝晶组织细化。     

公共建筑被动式太阳能采暖一例

在甘肃省中，小城镇的办公建筑中，从采暖，提供生活热水等方面采取太阳能采暖与建筑相结合的技术，显著地改善了办公环境，节约了常规能源。     

试论瑞利—索末菲衍射公式的理论基础

本文首先对瑞利—索末菲衍射化式进行了质疑,然后,通过考虑真实衍射平面的吸收和散射,并重新确定衍射平面的位置,解决了所存在的问题。     

利用粘弹性原理研究岩层移动下沉

本文提出把岩石表示为开尔文体和弹性元件串联的力学模型,认为地下开采后的采空区上方和煤层上方的顶板为粘弹性基础上的粘弹性悬臂梁.根据悬臂梁受弯曲的理论,推导出了采空区和煤层上方地表下沉计算公式.     

Zircon U-Pb SHRIMP dating for the volcanic rocks of the Xiong’er Group: Constraints on the initial formation age of the cover of the North China Craton

The volcanic rocks of the Xiong‘er Group occur widely in the southern part of the North China Craton, which mark the beginning of the cover in the southern part of the North China Craton. The age of the volcanic rocks is thus crucial to understand the tectonic regime and evolutionary history of the North China Craton in the Proterozoic age. Zircons from five volcanic rocks and intrusions were dated by U-Pb SHRIMP method. The results indicate that the Xiong‘er Group formed in 1.80--1.75 Ga of Paleo-Proterozoic. Since the Xiong‘er Group formed earlier than the Changcheng System, the earliest rocks in the Changcheng System is therefore assumed to be formed in 1.75 Ga. A thermal-tectonic event of ca. 1.84 Ga is indicated by new zircon U-Pb SHRIMP ages in the southern part of the North China Craton. The volcanic rocks of the Xiong‘er Group thus represent the initial magmatism of the Paleo-Proterozoic breakup of the North China Craton. Numerous inherited zircons in the volcanic rocks mainly formed in ～2.20 Ga, indicating that the source magma of the volcanic rocks may be derived from the ～2.20 Ga crust, or from a mantle magma with significant contamination of the ～2.20 Ga crust.     

Synthesis and characterization of semiconductor zinc sulfide nanotubes by soft-template method

ZnS nanotubes have been successfully synthe-sized from solutions containing a surfactant, Triton X-100(t-octyl-(OCH2CH2)χOH, χ=9, 10). X-ray diffraction (XRD),transmission electron microscope (TEM) and selected areaelectron diffraction (SAED) are employed to characterize thestructure and morphology of as-synthesized product. XRDand SAED pattern indicate that as-obtained products consist of pure polycrystalline cubic-phase ZnS structures. TEM images reveal that most of the products are tubular struc-tures, with diameters ranging between 37--52 nm andlengths up to 3 μm. The wall thickness of as-obtained ZnSnanotube is around 9 nm. The growth mechanism of ZnSnanotubes has also be proposed.     

宏观经济智能决策支持系统MEIDSS

ＭＥＩＤＳＳ是一个大型的智能软件系统，本文介绍ＭＥＩＤＳＳ的总体结构和功能特征，主要集中于面向对象（００Ｍ）和ＡＩ相结合的系统开发方法，以及ＭＥＩＤＳＳ实现仿真决策问题自动求解的技术.     

Beatty序列中的无平方因子数

用三角和估计方法研究了无平方因子数在Ｂｅａｔｔｙ序列「ｎθ」中分的布，这里θ〉１是实数，并得到了一个比较强的渐近公式。     

五行学说和“天人相应”的数学模型

本文给出了五行学说和“天人相应”这两个中国古典哲学理论的数学模型,论证了这两个理论和现代控制论的一致性。