基于Petri网与改进A星搜索算法的矿井机车调度优化

为了提高煤矿井下机车调度效率、防止机车碰撞、堵塞,根据井下调度特点建立了机车运行赋时Petri网模型。针对原有启发式A*搜索算法存在的易陷入局部最优的缺点,提出了基于petri网的并发变迁遴选算法,引入变迁并发度概念,与启发式A*搜索算法相结合,得到改进的A*搜索算法。经过改进后算法的回溯计算,得到Petri可达图上的最佳路径,从而得出最优调度策略。根据以上算法进行MATLAB建模,最终仿真结果表明,经过改进的启发式A*搜索算法有效的避免了陷入局部最优解,其计算得出的调度路径及调度策略资源消耗量最少,调度效率较高且未出现机车堵塞碰撞等问题。     

煤矿机车监控系统的功能分析及应用

煤矿机车是煤矿矿井平巷运输的主要动力,在我国煤矿业发展中应用广泛,但存在监控水平低、调度效率低和安全性不高等问题。该文分析了煤矿机车系统的工况特点,对煤矿机车系统所需要的功能进行了分析,主要包括监控要求和通信要求,以及与之对应的控制设备。在此基础上,设计出一款煤矿机车的监控及调度系统,该系统包括网络、服务器、RFID标签和车载装置等,其中车载装置是整个系统的核心。煤矿机车监控及调度系统在某煤矿矿井中得到了应用,能够满足煤矿机车运行要求。     

基于Petri网与改进A~*搜索算法的矿井机车调度优化

为了提高煤矿井下机车调度效率、防止机车碰撞、堵塞,根据井下调度特点建立机车运行赋时Petri网模型。针对原有启发式A~*搜索算法存在的易陷入局部最优的缺点,提出了基于Petri网的并发变迁遴选算法,引入变迁并发度概念,与启发式A~*搜索算法相结合,得到改进的A~*搜索算法。经过改进后算法的回溯计算,得到Petri可达图上的最佳路径,从而得出最优调度策略。根据以上算法进行MATLAB建模,最终仿真结果表明,经过改进的启发式A~*搜索算法有效地避免了陷入局部最优解,其计算得出的调度路径及调度策略资源消耗量最少,调度效率较高且未出现机车堵塞碰撞等问题。     

铁路GSM-R网络基于位置呼叫限制方案的研究

本文结合目前铁路调度通信业务现状及存在问题进行分析,通过研究智能网提供的基于位置呼叫限制功能,来解决铁路行车调度与机车司机之间通信中存在的问题。     

浅谈运输生产对机车节能的影响

机车能源消耗在铁路运输生产中占较大的成本支出,约占机务系统生产成本支出的70%以上。通过分析影响列车机车能源消耗因素,提出优化列车运行方案及运输调度指挥、提高机车检修质量、提高机车乘务员的操纵水平、加强机车能耗分析、推广机车节能技术等节能措施挖潜。     

机车股道调度命令系统的研究

针对目前存在的机车调度安全问题,特别是对库内作业中的同一时间进库、出库、库调的复杂性进行分析后,研究人员提出设计改造方案,开发出＂机车股道调度命令系统＂。本系统采用先进可靠的无触式传感器和集成模块实现信息共享,采用最优控制网络系统盯控关键部位。该系统对于机车股道能进行实时监测和显示,使调度室、扳道房的道岔信息同步,实现调度室、现场、机车的协调一致,确保了行车安全,提高了经济效益。     

基于GPS技术的铁路货运管理系统研究

基于GPS技术的货运管理系统采用差分GPS与车轮传感器相融合的方式为机车提供准确的位置信息,采用3G/GPRS无线通信方式实现车地通信,在调度中心进行实时监控机车位置,实现机车和调度中心的双向通信。同时,基于GPS数据信息实现了机车运行以及货运信息的统计及记录,机车驾驶室的实时视频监控以及机车接近预警功能。该系统的研发设计将极大的增加行车安全和专用货运线路的调度效率,具有广阔的应用前景。     

基于嵌入式的机车运行状态远程实时监测系统设计

为了实现机车运行状态远程实时监测,综合了嵌入式技术、现场总线技术、GPRS无线通讯技术设计了本系统.系统提取传统机车监测设备数据,各个功能模块在μC/OS-Ⅱ操作系统调度下协调工作,通过稳定可靠的CAN总线通讯及GPRS远程无线通讯实现了机车运行状态实时远程监测.经过与机车设备多次的联机调试实验表明,该系统结构设计合理,工作稳定,可靠性高,车载显示和语音报警效果良好.     

铁水运输系统智能仿真模型

研究了铁水运输系统的建模与仿真问题,建立了三层控制结构的智能运输仿真模型,基于OOCPN建立底层工位的状态演化模型,通过仿真进程控制层驱动调度决策层·利用消息传递机制沟通状态变迁与仿真策略之间的关系,利用分层调度和调度精化思想设计的调度决策专家系统和避碰决策专家系统有效模拟了现实系统中铁水运输调度员和机车司机的智能决策行为·仿真结果表明智能仿真模型为运输调度系统的建模与仿真提供了一种实用的解决方案·     

网络化煤矿单轨吊运输调度系统研究

针对目前煤矿运输系统的不足,提出了一套单轨吊运输调度系统,首次实现了单轨吊运输系统在地面和井下的调度、指挥与监控,实践结果表明此系统为地面调度员更合理地指挥机车运输提供良好的平台,提高了井下安全运输的效率。     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

A computer generator for randomly layered structures

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

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.     

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to