矿井安全监控平台中的智能决策系统研究

针对当前矿井监控系统只提供阈值报警的不足,充分利用监控系统数据库中丰富的历史数据,先甄选出正常数据样本与异常数据样本,分别对正常、异常样本建模,再提取各样本的特征向量,最后利用支持向量机训练各样本的特征向量,得到以矿井瓦斯为主的在线预测模型。仿真结果表明,支持向量机预测模型能够实现矿井瓦斯的在线测量与危险性提前预测,为矿井管理人员提供智能决策指导,进一步完善了矿井监控系统的整体功能。     

Mie散射法测量矿井粉尘浓度技术研究简

本文介绍了矿井粉尘测量的不同方法,系统阐述了Mie散射理论,对其理论公式的推导、以及各系数的获得,采用Matlab进行数据模拟,最后得出用Mie散射法对矿尘浓度测量的关系式,并显示其测量方法的优越性.通过对矿井粉尘测试系统设计,最终使用仪器对某矿井进行了实地数据测量,并且分析了对测量仪产生影响的因素,并阐述相关的解决方法.     

贝叶斯原理的不确定度评定方法比较

针对仅依据测量样本信息进行不确定度评定的局限性,利用贝叶斯信息融合原理,分别研究了基于无信息先验、共轭先验和最大熵先验分布的测量不确定度评定与更新方法,使评定过程充分融合历史先验信息和当前样本信息,提高了测量不确定度评定的可靠性。仿真实例表明:无信息先验方法没有将各组测量数据融合,其仿真结果波动最大;共轭先验方法仿真结果波动较大,经过多次数据融合逐渐趋于理论值;最大熵先验方法仿真结果波动较小,经过数据融合逐渐趋近于理论值。     

一种抗频偏的PN相位测量方法

PN相位测量是直扩系统时间同步的关键环节,为了使测量系统能够适用于航空航天等具有大多普勒偏移的环境中,文中提出了一种改进的基于时域相关值的三点二次内插PN相位测量方法.通过理论分析,对接收到的两路采样数据进行分段相关取模累加,可以很大程度上消除了载波频偏的影响;数值仿真验证了改进后的方法不仅具有良好的测量性能,同时具有很好的抗频偏能力.     

矿井勘探钻孔多参量监测系统设计

为了有效的对矿井勘探钻孔数据进行长期监测,设计了一套地勘钻孔实时监测系统.系统以STM32F103RCT6为主控芯片,采用LoRa低功耗传输网络为通信方式,上位机软件采用Python程序设计,实现实时数据的监测和存储.其中系统监测上位机软件能够实现包括用户登录和管理、串口参数设置、数据实时显示、数据存储、显示当前时间及蓄电池电压、表格打印等功能.试验结果表明,矿井勘探钻孔多参量监测系统可扩展性强,运行稳定,能够满足对矿井勘探钻孔多参量监测的需求,具有较好的应用前景.     

矿井通风仿真系统可视化研究

矿井通风仿真系统可视化,是矿井通风信息化管理的表现。矿井通风的信息化管理,能够保证施工过程和矿井生产安全可靠,对煤矿生产技术的改进也有一定的支持作用。该文就此阐述了矿井通风仿真秉统可视化的开发趋势,并分析了构建矿井通风仿真系统可视化的不足之处。通过矿井通风理论．GIs理论和计算机图形理论等,研究了矿井通风仿真秉统可视化的仿真平台,拓扑关系维护．双线图生成和通风网络解算。这些对矿井通风仿真系统可视化具有一定的参考价值和促进意义。     

基于B/S模式的矿井及典型灾害仿真系统框架与原型

针对数字矿山的发展与建设需要,以面向对象的思想,设计了一个基于Web的矿井及典型灾害三维仿真系统的框架结构.该系统框架包括核心功能模块、数据管理模块和辅助模块等三个功能模块.基于Web技术和可视化技术,形成了一套面向浏览器/服务器(B/S)模式的矿井及典型灾害三维仿真系统实现技术.运用这些技术,通过对某金矿实际数据的采集和处理,实现了基于B/S模式的地表地形、矿体及井巷工程仿真.     

基于LabVIEW的振动式悬移质测沙系统

利用虚拟仪器技术和网络通讯技术,使用LabVIEW和其中的通讯功能模块DataSocket,实现振动式悬移质测沙系统实时数据的采集处理及其远程传输.基于LabVIEW的振动式悬移质测沙系统作为在线实时测量河流含沙量的仪表系统,能够更方便精确地完成在线测量、密度显示、含沙量计算结果显示等,其用户界面更便于人机交流,而且实时数据的远程在线传输提高了测沙系统的性能,有利于推广使用.     

基于迭代测量更新的UKF方法

针对无迹滤波器(UKF)使用线性最小均方估计测量更新方法的不足,提出了一种易于工程实现的迭代测量更新方法.该方法多次使用状态的估计值代替预测值进行测量更新,能够得到更高精度的非线性估计.迭代时,每次使用标准UKF方法得到的均值和方差作为初始参数重新进行UT变换,从而能够得到更加准确逼近真实估计的采样点.仿真结果表明:基于迭代测量更新的UKF算法不仅具有无需计算雅可比矩阵的优点,而且具有较高的非线性近似精度和较高的运算效率,在相同数量级运算时间的情况下,其估计性能明显优于标准UKF和EKF等非线性滤波器.     

矿井粉尘浓度在线监测技术

解决在矿井监控中传统粉尘采样器不能满足在线监控粉尘浓度的问题,采用一台主机带多台分机的实时监测模式,将改进的数据融合算法应用到主机和分机中对粉尘数据进行实时处理.结果表明:改进的数据融合算法使粉尘传感器测量结果的误差得到了有效的控制;一台主机带多台分机分别计算测量参数的模式使矿井粉尘浓度测量实时性得到解决.该成果对煤矿井下粉尘数据在线监控具有一定的理论价值和实用意义.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the