基于VR技术的非煤矿山火灾应急培训系统的开发

为了克服非煤矿山矿井火灾传统应急培训方式效果不佳和部分培训内容难以实现的问题,设计了包含项目基本介绍、事故场景体验、人员角色体验和综合考核评价4个子系统的矿井火灾应急培训系统功能框架。利用3Ds Max三维建模软件和Unity3D游戏引擎建立了矿井火灾虚拟场景,通过C#语言脚本编程和HTC VIVE头显设备实现学员与矿井火灾虚拟场景的交互,从而完成了系统的开发,并对系统进行了评估。评估结果表明,VR培训系统的用户体验指标一般是PPT培训的2~4倍,其中沉浸性是PPT培训的22.5倍,培训效果指标一般是PPT培训的1~2倍,说明基于VR技术的矿井火灾应急培训系统的用户体验和培训效果更好。     

锂辉石与绿柱石浮选分离的试验研究

通过单矿物浮选试验考察了无机调整剂Na2S和六偏磷酸钠，有机小分子抑制剂柠檬酸、草酸、乳酸、酒石酸和EDTA二钠对受Fe^3 活化的锂辉石、绿柱石两种矿物浮选行为的影响。结果表明，柠檬酸和乳酸对锂辉石与绿柱石的抑制作用具有一定的选择性，但这种选择性并不高；酒石酸和草酸可强烈抑制这两种矿物，其抑制作用无任何选择性；硫化钠、六偏磷酸钠和EDTA二钠对锂辉石和绿柱石都具有较强的选择性抑制作用，且六偏磷酸钠和EDTA二钠对这两种矿物抑制作用的选择性优于硫化钠。锂辉石与绿柱石表面ζ—电位测定结果表明，锂辉石比绿柱石更易与EDTA二钠和Na2S发生吸附。     

选择性絮凝技术及其在矿物分选中的应用

介绍了选择性絮凝技术的原理、方法以及在矿物分选中的应用现状,提出了选择性絮凝技术的发展方向。     

水力旋流器选型计算新程序

根据作者提出的水力旋流器分离过程中工作流体呈组合螺线涡或由其简化的组合涡中的最大切线速度轨迹特征,导出生产能力、分离粒度和基本直径3个基本公式,编制出水力旋流器选型计算新程序,并用生产实例印证了该程序的适应性和可靠性,供读者在实际工作中参考或应用。     

西南地区典型胶磷矿中稀土元素的赋存特征

采用化学选择性浸出方法对沉积型胶磷矿中稀土元素的赋存状态进行研究.研究发现沉积型磷矿主要南碳酸盐相、磷酸盐相和硅酸盐相三相组成.各相最佳分相反应条件为:碳酸盐相控制乙酸浓度0.3％～0.5％,浸出温度为60℃,浸出时间90 min,分步浸出两次:磷酸盐相浸出条件是在10％～20％硝酸,浸出温度为60℃,浸出120 mi...     

Bohm Criterion for Collisionless Sheaths in Two-Ion-Species Plasmas

The sheaths of a plasma containing two species of positive ion generated in a low pressure discharge （- mTorr） are studied using a fluid model. It is shown anal...     

Numerical study of equilibrium solutions for axisymmetric plasmas with toroidal flow obtained using Solovev approach

Solovev approach of finding equilibrium solutions, which was extended to include the vacuum solutions provided by Zheng, Wooton, and Solano, was found extremely useful for the purpose of shaping studies. Its extension to toroidal equilibria with a general plasma flow was examined theoretically in a companion paper by Chu, Hu and Guo. The only meaningful extension was found for plasmas with a pure toroidal rotation and with a constant Mach number. A set of functions {SOLOVEV_ZWSm} was obtained which fixed location of the magnetic axis for equilibria with quasi-constant current density profile, with toroidal flow at constant Mach number and with specific heat capacity 1. The set {Solovev_ZWSm} should have complete shaping capability for plasma shapes with positive curvature at the boundary; but not for plasmas with negative curvature boundary points, i.e. the doublets or bean shaped tokamaks. We report here extensive numerical studies showing the shaping capability of {Solovev_ZWSm} for plasmas with pure toroidal rotations, including the change in topology of the solution when the rotation mach number changes. Included plasma topology are the sphere (spheromaks); and the tokamaks (including the doublets).     

Axial Shock in a Cylindrical Plasma with Current

Hugoniot relations of a two-dimensional axial shock with current and magnetic field in a cylindrical shock tube were investigated by a numerical method. The radial profiles of the magnetic field, electric current, pressures, flow velocities and temperatures between the up- and down-stream radial force-balanced plasma of the shock were revealed by numerical analysis. It is clearly found that the axial shock can lead to two effects： one is an inverse skin effect （i.e., the current density rises towards the center of the conductor）, the another is a reversed current effect which occurs near the edge and about a half radius. It is also found that the radial gradient of pressure, density and temperature all become very large near the center due to the axial shock.