基于CMS实测的露天转地下开采采空区群稳定性分析

针对石人沟铁矿在露天转地下开采过程中形成的大量采空区处理问题,采用先进的三维激光空区探测系统CMS,探测获取了采空区的三维形态和准确的空间坐标数据,借助大型矿床三维建模软件3Dmine建立起三维形态模型,综合运用数值模拟分析软件FLAC3D对采空区(群)进行稳定性分析,为矿柱回采和采空区处理提供了科学依据,为石人沟铁矿露天转地下安全开采提供技术支撑。     

隐伏峪耳崖型金矿找矿线索

峪耳崖金矿是一个产于小型花岗岩体中的大型金矿床,为了找到同类型金矿,从研究和总结峪耳崖金矿成矿条件和成矿规律入手,采用沿控制峪耳崖岩体NE向断层带追索的方法,在其南西约7 km的二河店东山发现了一条NE走向的花岗斑岩脉。该花岗岩脉宏观特征及岩性特征与峪耳崖含矿花岗岩极为相似,只是其中的石英多为六方双锥体,属高温β石英,预示着其深部可能有中低温花岗岩体发育。在该岩脉南侧发育有2条NW向含金石英脉,其品位和厚度变化趋势显示成矿溶液来自该岩脉的深部。另外,通过化探扫面在该岩脉周围圈出一个金的化探异常。根据这些情况,预测在该处地下的深部可能有隐伏的第二个峪耳崖型含金花岗岩体存在。期望这一认识能够成为寻找隐伏峪耳崖型金矿的一个依据和线索。     

基于FPGA的Twofish加／解密芯片设计

针对安全的数据传输及个人隐私权的保护等问题,研究基于FPGA的改进型Twofish加／解密芯片的设计。采用16组Rijndael-like S-boxes设计Twofish算法,提高算法的安全性,加入伪随机数器决定每回合使用的S-boxes,增加攻击者破解的难度。以Altera公司的Stratix EPI S20验证该芯片的功能,结果证明其能达到高安全性的要求。     

全相位偶对称频率采样法设计FIR滤波器

提出FIR滤波器全相位偶对称频率采样设计方法,此方法可以根据截止频率的要求设置移位因子,将两个子滤波器分别进行相反方向的移位,并构造补偿滤波器,最后将子滤波器和补偿滤波器组合而成所需的低通、高通、带通、陷波等滤波器,这种设计方法概念明确,简单易行,解决了传统FIR滤波器设计方法不能精确控制截止频率的难题.     

Synthesis of highly-oriented polyacetylene film in a liquid crystal solvent

The synthesis of oriented polyacetylene films is investigated by using a nematic liquid crystal as polymerization solvent. Highly-oriented thin films are obtained under a flow of catalyst solution in which a nematic liquid crystal is used instead of common solvents such as hexane and toluene. Nematic liquid crystals that could be used as solvents for the Ziegler-Natta catalysts are limited due to their reactive substituents with the active species and/or the components of the catalyst. Among the available nematic liquid crystals, phenylcyclohexane type is stable in the presence of Ziegler-Natta catalysts. Since fibril alignment in the oriented films is found to be along the flow direction of the catalyst solution, it appears that the direction of fibril growth coincides with that of the liquid crystal orientation, which is caused by an alignment effect of the liquid crystal molecules under a flow of the solution.This new and simple method allows quite large highly-oriented films to be synthesized, which makes it possible to investigate various kinds of anisotropic properties of polyacetylene.     

面向SOA的燃气企业信息化架构规划

针对企业信息化规划的发展现状,结合SOA的优势及其与企业架构的契合性,提出了通过企业架构实现SOA的落地,从而对企业信息化架构进行规划的解决方法.对信息化规划、企业架构以及TOGAF SOA的实现进行了研究与分析,并通过对燃气企业的规划实例论述了TOGAF SOA在企业信息化规划中的应用与实现方法,验证并总结了面向SOA的企业信息化架构应用于信息化规划的先进性、适用性和可推广性,同时结合SOA和企业架构SCADA系统的发展趋势对面向SOA的企业信息化架构规划的应用前景进行了展望.     

基于Virtools的虚拟小区漫游系统的设计与实现

虚拟建筑小区漫游系统是虚拟现实技术的综合应用,作者使用三维建模软件-3DMAX软件和多功能三维开发工具软件-Virtooh软件,设计实现了南堡盐场西苑小区虚拟漫游系统.此系统可以为用户提供多视点、多场景的浏览,使人有身临其境之感.     

唐山地区农村电价问题探讨

分析唐山地区当前农村电网维护费标准不统一等农网电价执行中存在的问题,提出规范农村电网维护费收取标准、规范销售电价分类、规范终端电价政策差异等相关建议,为规范农村电价提供参考。     

The effects of chloroform toxicity on methane fermentation

The methanogenic phase of anaerobic digestion is often considered to be the most sensitive step in the overall process. Chloroform, a model industrial toxicant was assayed with methane fermentation, acetate enrichment cultures. Commonly, microbial toxicity response studies have observed the toxicity response over a relatively short time span, on the order of a few hours or days. In addition, cessation of observed cell function has often been assumed to be equated with death of the cells. The purpose of this study was to determine the toxicity response under various conditions over prolonged periods, on the order of months, with major emphasis on the recovery pattern. The following parameters were observed: concentration of toxicant, solids retention time, biomass concentration, toxicant exposure time, cell age, toxicant administration pattern and temperature.The methane fermentation culture was able to acclimate to the presence of chloroform while fermenting acetate to methane. Inhibition of unacclimated cultures was noted at 0.5 mg l⁻¹, but with acclimation 15 mg l⁻¹ could be tolerated. There was a clear correlation between dose and inhibition. Recovery from inhibition was a function of SRT and biomass concentration. Younger cells were more resistant than older cells. The duration of chloroform exposure was directly related to the degree of residual inhibition. Reduced temperature delayed recovery of gas production from slug doses of chloroform. Radio tagged chloroform studies indicated that recovery of methane production occurred due to acclimation of the methanogens to the presence of chloroform and not from the disappearance of chloroform by microbial degradation.     

转炉扩容的炉体温度测试及炉壳综合应力分析

对某钢铁公司炼钢厂扩容后的2号转炉炉壳进行现场温度测试,由测试结果运用有限单元法对炉体进行温度场模拟以及三维热机耦合应力分析,分析炉壳的温度场及应力分布,为转炉炉体的扩容改造与安全性提供了数据参考。