铜盐改性PAN的结构与导电性

介绍通过化学反应方法，将铜的硫化物引入到聚丙烯腈的纤维或粉末中，使其具有良好导电性。通过与温度的变化关系，Ｖ－Ｉ特性以及ＳＥＭ、ＸＰＳ、Ｘ射线等对导电ＰＡＮ的微结构和导电机理进行了研究。     

制约胶结充填采矿法发展的若干充填体力学问题

文章概述了充填体力学的概念和研究内容。指出了胶结充填体的力学作用，胶结充填体所需强度的确定，一定强度的胶结充填体所需材料的配比设计，三个充填体力学问题正制约着胶结充填采矿法的发展。结合作者的研究，全面讨论了三问题国内外的研究现状，已取得的研究成果和尚待深入进行的工作，提出了解决这些问题的措施。     

一种新型水电站多变量自校正调节器

介绍一种新型水电站综合优化多变量自校正调节器，它可使频率调节和负荷优化分配同时实现．在每一次调节完毕后，频率和功率均达到最优，在调节过程中负荷分配始终遵循优化分配原则，从而缩短了调节时间，并改善了调节过程的动态品质     

The effect of microstructure of ferritic spheroidal graphite cast irons on intergranular fracture at intermediate temperatures

The effect of microstructure, by varying cooling rate, and the independent influence of ferrite grain size, by varying annealing temperature, on intermediate temperature embrittlement of ferritic spheroidal graphite cast irons have been investigated. The intermediate temperature embrittlement of ferritic spheroidal graphite cast irons depends on the triaxial stress field around the graphite nodules and also depends on ferrite grain size. When the carbon content of ferritic spheroidal graphite cast irons is constant, the hydrostatic tensile stress does not change by varying microstructure. Therefore, intergranular fracture will exist when the ratio of the hydrostatic tensile stress to equivalent stress is larger than one (σ _m /σ _eq 1). It can still be eliminated by decreasing the ferrite grain size.     

The Medium-Energy Particle Analyzer (MEPA) on the AMPTE CCE Spacecraft

The medium-energy particle analyzer (MEPA) was designed to measure the spectra and composition of magnetospheric particle populations from 10 keV per nucleon (for oxygen) to more than 6 MeV The instrument provides for high background rejection and a geometry tactor large enougn (10-2 cm2 * sr) to be sensitive to rare natural species and tracer ions beyond geosynchronous orbit, while having the ability to operate without saturation in the very high flux regions of the inner magnetosphere. The MEPA telescope measures time of flight and thus velocity of energetic ions from a thin front foil to a rear solid-state total-energy detector, determining the incident ion mass. The telescope is capable of isotopic resolution of hydrogen and helium, of elemental resolution up through oxygen, and can resolve major species and groups to beyond iron with 32-sector angular resolution and temporal resolution of 0.2-24 s. MEPA represents a new and extremely promising technology for space-particle instrumentation in that it has the capability of measuring low-energy heavy ions with high efficiency while discriminating against high natural fluxes of protons.     

Stability design criteria for steel members and frames in the United States

This paper attempts to give designers an insight into the beam-column problem. The important parameters such as (i) the ultimate strength of columns and beams which are special cases of beam-columns and (ii) secondary effects (P-δ and P-Δ), that should be considered in the ultimate strength design of beam-columns, are identified and discussed. Ultimate strength design interaction equations recommended and proposed in the United States for different categories of beam-columns are then presented. Important features of these equations are summarized. Directions of further research are indicated.     

Study on the relationship between intermediate-temperature embrittlement and triaxial stress induced by the ellipsoidal graphite in hot-rolled ferritic spheroidal graphite cast iron

The intermediate-temperature embrittlement of a hot-rolled ferritic spheroidal graphite cast iron was studied with the consideration that triaxial stress is induced by the ellipsoidal graphite particles of three unequal axial radii. The graphite shape was changed by various rolling reductions, and the tensile tests were performed at 673 K. The results show that the elongation and flow stress are independent of rolling reduction, and intergranular fracture occurs in all specimens. In the plasticity analysis, the triaxiality ratio (σ _m σ_eq) at a point in the ferrite matrix center can be expressed in terms of graphite shape ratio (b _d ) and graphite interparticle spacing (2a _d ) as σ _m /σ_eq = 1/3 +a _d /(2b _d ) where σ _m is the hydrostatic tensile stress and σ_eq is the equivalent stress. Accordingly, the average triaxiality ratio in the matrix center region is independent of rolling reduction and greater than one, a result that is consistent with the fact that the elongation is about constant, and all specimens undergo intergranular fracture. Moreover, the rolling reduction independent flow-stress behavior can be rationalized by the analytical result that the average σ _m /σ_eq is unchanged with rolling reduction, where σ _z is the internal stress along the tensile direction.     

用动态有序弹性匹配方法识别手写印刷体汉字

本文为手写印刷体汉字分类提供了一种新的实用解决方法。本方法采用日本山本氏提出的用松驰匹配方法识别手写印刷体汉字的基本思想。给出了用汉字轮廓点的差分作为轮廓跟踪及折断点选择的算法,提高了轮廓折线化速度;分类是按汉字四周的外轮廓线分二级进行匹配的,提出了动态有序弹性匹配方法,使全域松弛匹配得以在局部区域进行,从而有效地提高了匹配速度;在进行第一级粗分类时,采用多个模板,有效地提高了按偏旁位置分布进行分类的正确率;最后利用内轮廓折线与字典逐字匹配,达到手写印刷体汉字识别的目的。本识别系统在386微机上用C语言编程实现,对国标一级3755个汉字进行了三万余字的识别试验,前十位的累计正确分类率达92%,第一位的累计正确分类率达84%。识别时间为每字1.8秒。     

锦 7-048-37 井三维绕漏设计与施工

介绍了辽河油田锦７－０４８－３７井三维绕漏设计与施工情况。探讨了三维绕漏定向钻井设计程序和绕漏点确定方法。总结分析了易漏区域绕障钻井的钻具组合方式、钻井液性能要求及钻井参数优选等技术问题。该井的钻探成功为今后处理浅层井漏提供了一条新途径。