Influence of small dozes ultra-violet radiation on motion of dislocation in alkali-halide crystals

The purpose of this work was research into influence of ultra-violet radiation on size of run of regional and screw dislocations in beams of dislocation sockets, formed at indentation surface of alkali-halide crystals. In experiments it was used crystals NaCl, with the quantitative maintenance of impurity 10-2 -10-3weight%, the wave length of UV-radiation λ=250 nanometers, the sizes of samples 10mm× 20mm× 2mm,temperature of samples was constant T=290 K.It is established that indentation and the simultaneous irradiation of samples a ultraviolet is increases size of run of head dispositions in dislocation sockets..It is marked, that influence UV-radiation nonequivalence for various times of an exposition. At small times (till 5 minutes) the size of run grows. The length of beams increases on ～ 50 %. At the further increase in time of influence of a ultraviolet the length of beams is reduced till the sizes corresponding stressing without an irradiation (Figs. 1, 2, 3). The effect is observed on dislocation beams of regional and screw orientations and most expressed at small loadings (in our experiments-10 grams) (Fig. 3).Observable effects are explained from positions dislocation-exciton interactions. At UV-radiation exciton cooperates with the charged step on a disposition, causing movement of a step along a disposition on one internuclear distance. Due to this interaction overcoming by a disposition of a grid of stoppers is facilitated.Big times of endurance cause a relaxation of pressure directly in a print that provides convertible movement of dispositions in area of a print and as consequence, reduction of length of beams of dislocation sockets.     

进给运动对铣削工作角度的影响

基于对铣削加工过程的分析 ,得出了有进给运动时 ,铣刀工作角度的数学模型 ,定量地讨论了进给运动对铣刀工作角度的影响 ,证明了对称铣削的实质不对称性 ,求导出进给运动的临界速度公式。     

Influence of gas pressure state on the motion parameters of coal-gas flow in the outburst hole

Carried on the one-dimensional analysis to the motion state of coal-gas flow in the outburst hole, and deduced the relational expression between the motion parameters （containing of velocity, flow rate and density etc.） of bursting coal-gas flow and gas pressure in the hole, then pointed out the critical state change of coal-gas flow under different pressure conditions which had the very tremendous influence on both stability and destructiveness of the entire coal and gas outburst system. The mathematical processing and results of one-dimensional flow under the perfect condition are simple and explicit in this paper, which has the certain practical significance.     

Effect of slurry properties on particle motion in IsaMills

IsaMill? is a high-speed stirred mill for a range of milling duties from ultra-fine to relatively coarse grinding in the mineral processing industry. This work investigated particle and slurry flow in a mill using a combined Discrete Element Method and Computational Fluid Dynamics (DEM-CFD) approach. Slurry properties, such as flow density and viscosity, were varied to study their effects on the flow properties in terms of flow velocity, power draw, collision frequency, collision energy and total impact energy. Significant differences were observed when slurry was introduced and other conditions unchanged. With increasing density, fluid and particle flows showed stronger circulation in the axial direction due to the larger drag forces. Increased relative velocity and interaction between particles with disc led to higher collision frequency and collision energy. Increase in flow viscosity limited particles from moving towards the outer wall and the particles were more dispersed due to the larger circulating velocity in the axial direction. The total impact energy of the media and power draw also increase with slurry density and viscosity. The developed model provides a useful framework for further analysis of particle–slurry interactions in IsaMills?.     

充气式液固流化床内颗粒运动研究

为提高充气式变径液固流化床内细粒级(1 mm)的金属和非金属混合物的分选效率,有必要对床内颗粒运动特性进行探讨。首先对颗粒在充气式变径液固流化床中受力状况进行了理论分析;然后采用高速动态图像分析系统宏观记录了充气式液固流化床内塑料颗粒和玻璃颗粒的运动轨迹和分选过程,得到了颗粒运动的位移及速度随时间变化曲线,为细颗粒的物理分选回收提供理论依据与技术支持。     

浅谈厚煤层错层位巷道布置采煤法

能源资源是发展生产、保障人民生活的重要物质基础。随着社会发展、科技进步和人口的增长,化石能源的消耗速度也越来越快。因此,最大限度地节约与综合利用能源已是矿业乃至科学技术发展的明显趋势。论文通过对错层位巷道布置采煤法的介绍,阐明了该采煤法对提高煤炭回采率所具有的重要意义。     

Action of laser radiation on rocks

Journal of Mining Science -     

中小型露天煤矿设备管理与维护对生产效率的影响

设备是露天煤矿从事生产的主要工具和手段,设备效率直接影响到矿山生产能力和效率。在分析露天煤矿挖掘机生产能力的基础上,讨论了影响挖掘机生产能力的因素,确定设备的管理与维护是影响和决定挖掘机生产能力的重要因素。加强露天煤矿设备管理与维修,对提高露天煤矿设备出动率、实动率,保证露天煤矿设备作业效率,降低生产成本,提高露天煤矿经济效益具有重要意义。从加强操作人员和设备维修人员的技能培训、规范设备管理、实行"四定"机制、加强预防性维修4个方面提出了对中小型露天煤矿设备管理与维护的基本措施,并分析其能力与相关因素的相互关系,并从生产组织管理角度提出了提高挖掘机作业效率的具体措施。     

浅析我国小矿立法

小矿是我国矿业经济的重要组成部分。近些年来,小矿立法逐渐提上议事日程。本文通过对国外小矿法律政策的分析,并结合我国小矿自身特点,从小矿立法的模式、法律主体的关系,以及法律实施等角度出发,提出我国小矿规制的方案和思路。     

小错距上下煤层反向同采对上工作面巷道的影响

根据新集一矿已有的工程地质资料和科研成果建立模型,采用FLAC3D进行了数值模拟,并结合现场观测,研究了小错距上下煤层工作面反向同采时,上工作面巷道围岩应力、塑性区和变形情况,研究结果表明,上工作面巷道围岩变形在两工作面推进过程中呈现两个阶段的变化,该巷道围岩一定范围内发生塑性破坏是其围岩变形不断增长的主要原因,因此上工作面巷道支护的关键是加固其围岩的塑性破坏区,提高围岩的自承载能力.     

小型矿井中陀螺定向测量方法探讨

本文介绍了在小型矿井中使用陀螺经纬仪进行定向测量的简易方法,并分析了它的精度.     

深海采矿扬矿管的横向运动响应分析

在陆地矿产资源日渐枯竭与工业需求不断增长的矛盾下,深海矿物的开采已是势在必行。深海采矿扬矿管有区别于石油平台立管的特殊之处,由于处于悬垂状态而具有高自由度,因此其水平运动响应值得关注。采用有限元软件Abaqus的Aqua模块对其进行有限元模拟,通过建模计算,得到扬矿管在作业状态与不同拖航速度下的水平偏移与弯矩分布情况,得到了一些具有参考价值的结论。     

流膜磁分离技术中颗粒的运动特性研究

针对我国贫、细、杂特征的铁矿资源开发的流膜磁分离技术,能有效地提高难选复杂铁矿物的铁回收率。本文描述了颗粒在流膜矿浆分选中的运动过程,分析了流膜颗粒在分选过程中的运动状态与运动规律,有助于掌握和应用流膜磁分离技术。     

Spreadsheet-based modeling of liner wear impact on charge motion in tumbling mills

Grinding remains the major constituent of the total cost of processing minerals in most applications. Charge motion is one of the key parameters affecting grinding efficiency and mill power draw. Although there have been numerous investigations on the effect of liner design on charge motion, the effect of charge profile due to liner wear during mill operation along the mill length has not received much attention. In this research, Powell’s analytical approach to calculate the charge trajectory with respect to the liner profile was used to develop a software based on Microsoft Excel© . As a case study, the liner wear profile of the Sarcheshmeh copper complex SAG mill was used to model the liner wear rate and calculate the changes of lifter face angle and lifter height during mill operation. Results were then used to determine charge motion in the SAG mill at any given operation time. The results indicated that after 4000 h of operation the lifters face angle increased from 14° to 47.1° and the height of lifters decreased from 15.2 to 5.8 cm. Modeling charge motion in the mill after 3000 h of operation showed 34° difference between the maximum and minimum of angles of impact along the mill length due to the nonuniform wear profile. It was also found that the variation in the pattern of the charge motion depends on the mill working hours and the distance of the desired point from the feed end. It was determined that the ratio of spacing to the height of lifters (S/H) plays an important role in the grinding efficiency and throughput. After 4000 h of operation, S/H ratio of the Sarcheshmeh SAG mill increased from 1.7 to 4.6.     

基于SimMechanics的平面四杆机构运动分析与仿真

四杆机构是机械设计中常用的一种机构，机构运动分析就是根据给定的原动件运动规律，求出机构中其它构件的运动。通过分析可以确定某些构件运动所需的空间，校验它们运动是否干涉，运动轨迹仿真动画则更为形象直     

浅议我国小煤矿安全生产

通过对我国目前小煤矿安全生产现状进行分析,找出了安全生产存在的问题,并针对存在的问题,提出了具体解决措施。     

基于波动理论的煤炭期货市场运行规律研究

以波动理论的视角,从影响煤炭期货价格的关键因素出发论述了煤炭期货市场的运行规律,并将煤炭期货市场分为季节波动、周期波动、地域波动三种类型进行阐述.