Linux下多系统引导安装实例

介绍不需要专用的多系统安装软件,在一台计算机上实现Windows系统与Linux系统的共存,满足用户对多系统的应用需求.     

VC下实现基于Modbus协议的DCS与远程I/O系统通信

本文在分析Modbus协议及其通信原理的基础上，结合工程实际，提出了一种在工业PC机上实现串行通信的方法，并在Visual C 6．0环境下开发了通信的应用程序，实现了基于Modbus协议的DCS与远程I／O系统通信。     

面向对象的柴油机燃油供给系统计算机仿真程序设计

建立了柴油机燃油供给系统计算机仿真的数学模型，提出了其面向对象的仿真设计思想和设计方法。运用该设计方法可有效提高仿真系统的可适用性、可维护性和可靠性。     

不同直径匹配度封堵气囊的工作机理和试验验证

为研究气囊作为临时性封堵装置在隧道工程中的应用情况,建立其受力分析模型,得到了气囊内压和形状随外压增长的变化规律,得到了两种失效模式和正常工作时需要满足的3个控制条件,特别是外压不能大于内压这一独特的控制条件.由于气囊直径与隧道匹配度的大小直接影响封堵效果,因此确定直径允许误差范围在工程设计中至关重要.分别采用直径大于、等于、小于隧道直径的3种气囊进行堵气和堵水的模型试验,得到不同直径匹配度的气囊在气压和水压作用下的变形规律、内外压关系及失效极限状态的控制条件.试验结果表明:直径适中的气囊匹配性最好,气囊的变形和失效模式完全符合理论公式;直径略偏大的气囊若不出现初始贯通的褶皱,其封堵效果和失效模式与直径适中的气囊类似;直径偏小的气囊,由于一部分内压用于抵消使其膨胀至贴紧隧道壁所产生的材料拉力,容易导致其摩阻力不足而在外压作用下产生整体滑动.据此提出了气囊制作误差允许范围上下限的标准,为气囊制作过程中的误差控制提供依据.     

火炬集液罐动态模拟计算

采用动态模拟软件DYNSIM对火炬集液罐进行动态模拟计算,研究火炬液相量的变化情况,为火炬集液罐的设计提供参考。     

Investigating the influence mechanism of hydrogen partial pressure on fracture toughness and fatigue life by in-situ hydrogen permeation

In this work, we investigate the influence mechanism of hydrogen partial pressure on fracture toughness and fatigue life of a high strength pipeline steel. Both fracture toughness test and fatigue life test are carried out under different hydrogen partial pressure. The experimental results show that with the increasing of hydrogen partial pressure, fracture toughness and fatigue life decrease and the decrease trends gradually flatten out. Hydrogen has a larger effect on fatigue life than fracture toughness. Only 3% hydrogen gas can cause a 67.7% decrease of fatigue life. The in-situ hydrogen permeation test is performed respectively in 2 MPa, 5 MPa and 8 MPa hydrogen partial pressure. With the increasing of hydrogen partial pressure, the increase trend of hydrogen permeation current gradually tends to be gentle, which indicates that the hydrogen atoms entering into the material gradually become saturated. This result can be used to clarify the influence mechanism of hydrogen partial pressure on fracture toughness and fatigue life.     

基于EGSnrc仿真的二维空气电离室剂量探测器收集电极影响研究

收集电极是二维空气电离室剂量探测器的重要组成部分，影响剂量测量的准确度。为了研究收集电极对剂量测量的影响规律，采用蒙特卡罗程序EGSnrc，分别在不同射线能量下对不同材质（C、Al、Cu）、不同收集电极厚度（5~70 μm）进行模拟仿真，给出了影响规律的定量分析。结果表明，在工艺允许的情况下，应优先选择C作为收集电极材料；当只能采用Cu作为收集电极材料时，应采用工艺可达的最小厚度，并在使用中进行标定。     

Separation and analysis of lignite bioconversion products

The bioconversion of coal at ambient conditions is a promising technology for coal processing, although the mechanisms of coal degradation are still not understood fully. In this work, the bioconversion of lignite was studied using a fungus isolated from decaying wood. The lignite samples were oxidized with nitric acid under moderate conditions and then the oxidized samples were placed on a potato medium with isolated fungus for lignite bioconversion. Lignite, oxidized lignite and residual products after bioconversion of lignite were sequentially extracted with petroleum ether, CS₂, methanol, acetone and tetrahydrofuran (THF), and then each extract was characterized by gas chromatography–mass spectrometry (GC/MS). The differences in composition and structure among the samples were inferred by comparing the differences between the extracts. The results show that aromatics with one or several benzene rings and their derivatives; and some long-chain alkanes containing oxygen decreased in the methanol-, acetone-, and THF-soluble fraction from residual lignite, whereas long chain or a few branched alkanes and small quantities of aromatic compounds increased in petroleum ether and CS₂ soluble fractions.     

全断面锚索施工钻机辅助支架的研制

普通锚索钻机难以在巷道帮部和底板施工,极大地制约了锚索支护的使用范围.为此,鹤煤公司六矿研制了一种可以实现全断面锚索施工的辅助支架,井在现场得到了应用.实践表明,使用该支架节省工时且安装方便,移动及维护简单,实现了全断面锚索施工.     

同步辐射微区X射线荧光和吸收谱技术在大气、土壤和动植物分析中的应用

同步辐射微区X射线荧光(Synchrotron micro-X-ray fluorescence spectroscopy,μ-SXRF)能够对物质进行元素分布分析和微区原位测定,具有高灵敏度、低检出限的特点。同步辐射X射线吸收谱技术(X-ray absorption fine spectroscopy,XAFS)能够提供原子周围的配位环境和化学形态,适用于进行元素形态分析。大气飘尘、土壤和动植物等是环境中元素迁移转化的重要载体,获取具有生物学意义的元素分布和形态,以及准确的定性或定量信息对研究这些元素在环境和生物体中的作用至关重要。随着研究的发展,同步辐射微区分析技术在此领域中得到越来越多的应用。本文介绍了同步辐射技术的基本原理和发展历程,回顾了近几年μ-SRXRF和XAFS技术在大气飘尘、土壤、植物和蚯蚓中元素的分布与形态研究领域的应用进展,对目前应用于此领域遇到的一些挑战进行了概括,并对其未来发展趋势提出了展望。