关于煤矿斜巷跑车防护装置的探讨

煤矿斜巷运输中发生的跑车事故,是斜巷运输过程中的一大安全隐患,着重探讨了如何科学合理地设置运用跑车防护装置,在斜巷运输过程中发挥作用,以使斜巷运输的跑车事故能够得以有效的预防。     

浅谈涤纶全拉伸丝油剂

介绍了涤纶全拉伸丝(FDY)工艺对纺丝油剂的要求,概括了国内外涤纶FDY纺丝油剂的研究状况,就油剂用表面活性剂原料的选择、油剂的配制、油剂配方设计以及油剂使用过程中应注意的一些问题进行了阐述。     

滑动弧放电等离子体-溶液系统协同零价铁降解酸性橙Ⅱ

为探究等离子体-溶液系统联合零价铁(ZVI)Fenton反应对酸性橙Ⅱ(AOⅡ)的降解效果,考察ZVI对降解过程的促进作用及降解机理,建立了滑动弧等离子-溶液系统进行了实验研究。以质量浓度200 mg/L的AOⅡ为例,改变ZVI投加量分别为0、4、7、10、13 g。结果显示ZVI投加量为10 g时,AOⅡ的降解程度最高,为97.8%。等离子体-溶液系统中滑动弧放电产生的H2O2与加入的ZVI结合发生Fenton反应,AOⅡ降解过程遵守一级动力学规律。对比不加入ZVI时的AOⅡ反应速率常数,加入10 g ZVI后初始质量浓度为100、150、200、250、300 mg/L的AOⅡ反应速率常数分别提高了12.9%、31.0%、39.4%、44.3%、47.8%。溶液化学需氧量(COD)去除率也表明了在降解过程中加入ZVI能够有效地提高降解率。运用色谱-质谱联用仪(GC-MS)测定了AOⅡ的降解机理,认为*OH攻击AOⅡ分子上与萘环相连的—N N—键,导致—N N—键的断裂,并经过一系列的氧化过程后形成无机小分子物质。     

开采沉陷中的层面效应研究

根据复合岩梁理论，推出了开采沉陷中层面滑移函数和层面滑移判断式。获得了层面滑移规律：即当弹性模量一定时，随主要影响半径ｒ的增大和最大下沉值减小，滑移间距增大；当ｒ和最大下沉值一定时，随着弹性模量的增加，滑移间距减小；随层面抗滑力的增加，滑移间距增大。     

滑翔增程弹导航系统误差修正方法研究

为了提高滑翔增程制导炮弹的姿态测量精度,分析了单GPS天线测量弹体姿态角的计算方法,应用GPS和INS全组合的方式,采用INS和GPS的位置、速度和姿态误差信息作为观测量,设计了卡尔曼滤波器,将滤波估计的结果反馈给INS,实现对测量系统全参数的误差修正.数值计算和仿真结果表明,采用基于GPS姿态测量信息的Kalman滤波方法,对INS惯导系统测量误差进行修正,降低了3个姿态角的测量误差,加快了系统误差收敛速度,提高了滑翔控制系统的控制精度,增加了制导炮弹滑翔增程的效果.     

引入侧向加速度反馈的侧滑转弯控制方法

针对大展弦比滑翔增程弹大侧滑飞行时滚转干扰力矩大,容易导致滚转舵饱和并造成滚转控制困难的问题,提出了大展弦比滑翔增程弹自动驾驶仪引入侧向加速度反馈的侧滑转弯(STT)控制方法。该方法通过在传统侧滑转弯自动驾驶仪的倾斜通道引入侧向加速度反馈,实现了倾斜角对侧向加速度的跟随,相当于在传统的侧滑转弯控制上增加了倾斜转弯(BTT)控制的效果。六自由度非线性仿真实验表明:大展弦比滑翔增程弹侧滑转弯自动驾驶仪倾斜通道引入侧向加速度反馈后,显著降低了飞行过程的侧滑角,使滚转舵偏远离饱和状态,提高了驾驶仪的滚转控制裕度。     

滑动弧放电等离子体法用于二甲醚重整制氢简

Gliding arc gas discharge plasma was used for the generation of hydrogen from steam reforming of dimethyl ether （DME）. A systemic procedure was employed to determine the suitable experimental conditions. It was found that DME conversion first increased up to the maximum and then decreased slightly with the increase of added water and air. The increase of total feed gas flow rate resulted in the decrease of DME conversion and hydrogen yield, but hydrogen energy consumption dropped down to the lowest as total feed gas flow rate increased to 76 ml. min^-1. Larger electrode gap and higher discharge voltage were advantageous. Electrode shape had an important effect on the conversion of DME and production of H2- Among the five electrodes, electrode 2# with valid length of 55 mm and the radian of 34 degrees of the top electrode section was the best option, which enhanced obviously the conversion of DME.     

Optimizing tape‐burnishing/wiping process of magnetic recording media through Taguchi method

For the ever‐increasing recording density in hard disk drives, ultra‐low gliding height media are required. It is an immense challenge for the tape‐burnishing/wiping process of media to reduce the asperities effectively and efficiently while no scratches occur. The purpose of this paper is to characterize and then optimize the tape‐burnishing/wiping process as so to minimize the asperities without leaving any scratches on the media surface. A Taguchi experiment design method is adopted to analyze the data and acquire an optimal level combination of process parameters. The resulting optimal combination is practically implemented in tape‐burnishing/wiping the several magnetic recording media, which reveals that the average pass ratio of 5 nm glide avalanche testing increases nearly doubly to a level of 96%. Copyright © 2008 John Wiley & Sons, Ltd.     

赣中安福煤田重力滑覆构造带变形岩石的显微构造研究

安福重力滑覆构造带中变形岩石的显微构造反映了:(1)该构造带变形的温压具有中间高两侧低的特点;(2)北缘滑覆带的三条断层变形的温压自北向南依次增高;(3)石英C轴组构具有“不完全小圆环带加点极密”的特点。这些证据说明了该区在近南北向应力作用下发生了多次重力滑覆。     

Forecast of Geological Gas Hazards for “Three-Soft” Coal Seams in Gliding Structural Areas

Gas outbursts from "three-soft" coal seams (soft roof, soft floor and soft coal) constitute a very serious problem in the Ludian gliding structure area in western Henan.By means of theories and methods of gas geology, structural geology, coal petrology and rock tests, we have discussed the effect of control of several physical properties of soft roof on gas preservation and proposed a new method of forecasting gas geological hazards under open structural conditions.The result shows that the areas with type Ⅲ or Ⅳ soft roofs are the most dangerous areas where gas outburst most likely can take place.Therefore, countermeasures should be taken in these areas to prevent gas outbursts.