基于SaaS的矿震远程预警系统关键技术初探

现有的矿震预警系统都是以独立形式运行于各矿区,相互之间没有关联,重复投资严重,且矿震数据海量繁杂,仅依靠现场分析无法满足实时预警需求。文章基于感知矿山物联网示范工程(夹河矿),对采用云计算SaaS模式构建的矿震远程预警系统关键技术进行了相关研究:首先给出了系统整体框架,然后重点探讨了该系统所涉及的三个关键技术,包括基于SaaS的矿震预警专家分析软件架构、多源SaaS数据库构建技术以及基于MapReduce的并发数据过滤接收技术。现场应用表明,所构建的系统已基本具备全国统一远程矿震预警系统的架构,能满足多矿区远程矿震预警的基本要求。     

基于REST架构的矿山数字移动办公平台

基于面向资源思想以及REST架构,首次提出了矿山资源抽象层的概念,将矿山中各个异构系统的功能、文档、界面、工作流等抽象为能够通过标准URI来唯一标识的抽象资源元数据,在决策或智能分析层通过对元数据的分析和处理来实现相应操作或得出相关的分析结果;提出了基于REST框架的矿山数字移动办公平台设计方案,并以神木张家峁矿业有限公司移动办公平台的建设为例,介绍了将多个异构系统快速集成在移动终端的实现方法。应用结果表明,该移动办公平台运行稳定,操作流畅,使得工作人员能够随时、随地、随手办公,大大提高了办公灵活性及效率。     

刑法视角下计算机犯罪概念的辨析

本文首先简要的介绍了几种关于计算机犯罪定义的学说,然后对刑法意义上的＂计算机犯罪概念＂进行了定位,最后论述了计算机犯罪的犯罪构成,为刑法理论和司法实践中准确认定该类犯罪提供了具体依据。     

Polynomial approximation of functions of matrices and applications

In solving a mathematical problem numerically, we frequently need to operate on a vector by an operator that can be expressed asf(A), whereA is anN ×N matrix [e.g., exp(A), sin(A), A^–-]. Except for very simple matrices, it is impractical to construct the matrixf (A) explicitly. Usually an approximation to it is used. This paper develops an algorithm based upon a polynomial approximation tof (A). First the problem is reduced to a problem of approximatingf (z) by a polynomial in z, where z belongs to a domainD in the complex plane that includes all the eigenvalues ofA. This approximation problem is treated by interpolatingf (z) in a certain set of points that is known to have some maximal properties. The approximation thus achieved is almost best. Implementing the algorithm to some practical problems is described. Since a solution to a linear systemAx=b isx=A ^–1 b, an iterative solution algorithm can be based upon a polynomial approximation tof (A)=A ^–1. We give special attention to this important problem.     

An experimental study of the thermodynamic properties of 1,1-difluoroethane

Experimental vapor pressures andP--T data of an important alternative refrigerant, 1, 1-difluoroethane (HFC-152a), have been measured by means of a constant-volume method coupled with expansion procedures. SixtyP--T data were measured along eight isochores in a range of temperaturesT from 330 to 440 K, at pressuresP from 1.6 to 9.3 MPa, and at densities from 51 to 811 kg·m^–3. Forty-six vapor pressures were also measured at temperatures from 320 K to the critical temperature. The uncertainties of the temperature and pressure measurements are within ±7mK and ±2kPa, respectively, while the uncertainty of the density values is within ±0.1%. The purity of the sample used is 99.9 wt%. On the basis of the measurements along each isochore, five saturation points were determined and the critical pressure was determined by correlating the vapor-pressure measurements. The second and third virial coefficients for temperatures from 360 to 440 K have also been determined.     

人民币汇率机制改革中参考一篮子货币的思考

分析了人民币汇率机制改革中选择“参考一篮子货币”制的原因;在肯定这次汇率制度改革给我国带来的有利影响,同时指出了参考一篮子货币制在短期内将面临的问题,并进一步提出关于完善该汇率制度的相关措施和建议,以期对我国汇率制度改革提供参考。     

板料成形模拟后处理中的截面物理量的显示技术*

在自行开发的板料成形有限元后置处理系统FASTAMP_POST中,采用了动态获取截面物理量的算法,实现了截面物理量实时显示功能。该功能真实反映了网格物理量的大小及其变化趋势,具有原理简单、易实现、执行速度快的优点。     

Enhancement by SO2 of initial activity for selective catalytic reduction of NO with CH3OH over \gamma-alumina

The effect of SO₂ on catalytic activity for NO reduction to N₂ by methanol in excess oxygen over $\gamma$ -alumina has been investigated. SCR activity increased initially upon exposure of a fresh $\gamma$ -alumina catalyst to SO₂ which is attributed to formation of Brønsted acid sites. Longer exposure to SO₂ leads to a decline in catalytic activity to a lower steady-state NO_x reduction activity which is independent of the SO₂ content in the feed gas.     

优良水消毒剂——ClO2的性质表现

二氧化氯是优良的水消毒剂,是氧化型消毒剂。二氧化氯对水中的一些还原态的金属阳离子、低价硫化物、氰化物、有机物等均有氧化作用。ClO2对无机物氧化以祛毒为主,对有机物的氧化降解以含氧基团的小分子化合物为主,即最终以无毒害作用的产物为主。