新时期加强和改进马钢企业文化建设的调研与思考

新时期马钢企业文化建设在继承传统的基础上全面展开和稳步推进,为马钢的生产经营建设和改革发展不断迈上新台阶提供了强大的精神动力,为马钢提升企业核心竞争力提供了有力的发展平台.     

Nuclear state density calculations: An exact recursive approach

Using single-particle level scheme as input, we have developed a code to calculate total and particle-hole state densities both for even and odd nuclei. A mathematically exact recursive method is used for the solution of the problem within Fermi gas model. No residual interaction is considered.     

HSDPA系统中分组调度方法的性能比较

讨论了高速下行链路分组接入(HSDPA)系统中适合采用的分组调度方法。依据HSD-PA系统的特点,讨论了MaxC/I、RoundRobin和Max/Min三种调度方法,并通过计算机仿真,对其性能进行了分析、比较。结果表明,Max/Min调度是一种适合于HSDPA系统的调度方法。     

水胶炸药生产排放污水中三种成分快速测定法

文中叙述了用电极电位,分光光度法快速测定水胶炸药生产排放污水中硝酸铵、硝酸钠、硝酸甲胺含量的分析方法及基本原理.其中硝酸铵、硝酸钠采用离子选择性电极Ritter和Ma法.试验表明,该法具有快速、准确、灵敏度高的特点.适用于化工厂排放污水中三种成分的快速测定.     

Three-dimensional imaging in double aberration-corrected scanning confocal electron microscopy, part I: elastic scattering

A transmission electron microscope fitted with both pre-specimen and post-specimen spherical aberration correctors enables the possibility of aberration-corrected scanning confocal electron microscopy. Imaging modes available in this configuration can make use of either elastically or inelastically scattered electrons. In this paper we consider image contrast for elastically scattered electrons. It is shown that there is no linear phase contrast in the confocal condition, leading to very low contrast for a single atom. Multislice simulations of a thicker crystalline sample show that sample vertical location and thickness can be accurately determined. However, buried impurity layers do not give strong, nor readily interpretable contrast. The accompanying paper examines the detection of inelastically scattered electrons in the confocal geometry.     

Effects of amorphous layers on ADF-STEM imaging

A study of high-resolution ADF imaging in uncorrected and aberration-corrected STEMs was carried out by multislice simulation. The presence of amorphous layers at the surface of a crystalline specimen is shown to significantly alter the visibility of the atomic columns. After propagating through an amorphous layer a portion of the beam passes without any alteration while scattered electrons introduce a Gaussian background. The dependence of the image contrast on the crystal structure, orientation and the types of the atoms present in the crystal was studied. In the case of uncorrected probes an amorphous layer thicker than 200 A is necessary to achieve considerable reduction of the visibility of the atomic columns, but with aberration-corrected probes only 60 A is necessary. With changes in defocus, crystalline specimens with amorphous layers on the top can also be imaged and high-resolution ADF images can be obtained. An amorphous layer at the beam entry surface affects the ADF image more than that of an amorphous layer at the exit surface. Approximately linear reduction of the contrast (with a slop of 1) is expected with increased thickness of amorphous layer.     

母材含碳量对珠光体-奥氏体异种钢焊接熔合区形态的影响

用同一焊接规范制成A402在DT3、20^#、45^#、T8钢上单道堆焊样品，用显微硬度、SEN EDS、TEM研究了母材含碳量不同时异种钢焊接熔合区的特征．实验结果表明：低碳钢母材接头熔合区由较平整的白亮带和针状类马氏体层组成；中、高碳钢母材接头熔合区由“锯齿形”组织和不完全混合区组成，其中，中碳钢母材接头的不完全混合区组织为类马氏体，高碳钢母材接头不完全混合区类马氏体层消失，为奥氏体．     

军用数字地图符号化处理技术

军用数字海图、地形图、航空图采用不同的数学基础、编码体系和符号体系。针对多军兵种联合作战的使用需求,该文给出了一种通用的军用数字地图符号化处理方法。     

提高马25井区开发效果的主要做法及效果

马25井区油层断失现象比较普遍,断失层剩余油富集,利用老井侧钻挖掘断失层剩余油是有效的增油手段;马25井区注入水水质差,对地层产生了严重的伤害,只有改善注水水质,利用水井增注解除地层伤害,方能保证油井稳产;马25井区的层间差异大,非主力层储层物性差,要保证挖潜效果,必须油、水并重。