亭南煤矿微震监测数据与工作面涌水量关系研究

矿井水害事故的发生,不仅会影响矿井安全生产,造成巨大的经济损失,还严重威胁着井下工作人员的生命安全。为了解决矿井水害的威胁,有效预防水害事故,分析微震监测数据即微震事件数与事件能量级与矿井涌水量之间的相关关系,提出不同时期根据微震监测数据预测矿井涌水量,合理选择排水设备,预测突水事故,达到及时预警的效果。以亭南煤矿二盘区207工作面为研究对象,分析其工作面涌水量与微震数据间的相关性,结果表明:微震事件数、能量级与涌水量呈正相关关系,两者变化趋势基本相同,能够根据微震数据的变化预测涌水量的变化。     

循环载荷作用时不同实验条件下砂岩的声发射特征实验研究

通过循环载荷作用时不同位移速率、不同上限应力、不同下限应力以及不同水饱和度等实验条件下砂岩的声发射特性实验研究,探讨了循环载荷作用时不同实验条件下岩石的破坏损伤演化规律。研究结果表明,上限应力、下限应力、水饱和度等对岩石在承载过程中所发生的声发射事件数均有不同程度的影响,但位移速率对岩石在承载过程中所发生的声发射事件数的影响似乎不大。     

作业现场安全监督精益化研究

当前电网企业面临着巨大的安全生产压力,生产任务繁重,形势严竣。通过实施作业现场安全监督精益化研究,提高月度无违章作业现场比率,大大减少了作业现场违章件数,杜绝事故发生。     

浅谈人的行为和物的状态对安全造成的影响

安全与不安全是相对的概念，事故与安全生产也是相对的事件。这里所说的事故指发生在生产过程中，违背人们意愿且又失去控制的事件。具体到生产活动中，事故是要构成人体伤害或造成财产损失的。虽然，人们并不希望发生任何事故，但是，事故却总是在人们对危险因素控制不力，危险趋势不可遏制后而突然发生。     

煤矿坠仓事故原因动态分析与防治对策

针对煤矿坠仓事故危害严重和目前研究欠缺的情况,利用事件树分析法,对煤矿坠仓事故从事故发生的初始事件、后续事件直至事件结果的全过程进行了全面、动态的分析,分析初始事件可能的发展过程及可能的事件结果,并编制事件树,通过分析事件树中存在的事故连锁、成功连锁,研究导致事故的原因和保证工人安全生产的途径,并在此基础上提出全面、科学的防范措施,以防止类似事故的发生.     

基于贝叶斯方法的高含硫井口气液分离器动态风险分析

传统的定量风险分析方法不能有效利用井口分离器的运行状态数据进行动态风险分析,从而导致评估结果易于偏离实际。构建事件树模型模拟分离器异常事件的发展过程,然后基于贝叶斯方法利用事故先兆数据动态分析分离器安全屏障的失效概率和异常事件后果发生概率,并采用模糊损失率的方法量化事故后果造成的损失,进而完成对分离器的动态风险分析。结果表明,新提出的基于贝叶斯方法的高含硫井口气液分离器动态风险分析方法克服了传统风险评价方法的不足,可动态评估事故发生概率,并可动态反映分离器的风险变化,能够为高含硫井口气液分离器等相关设备的风险分析与控制提供参考。     

氯乙烯生产过程中危险化学反应工艺过程的辨识

化工生产过程危险因素众多,对化工生产过程的安全性分析就是要找出生产过程中可能导致事故的潜在的危险源,在危险源辨识的基础上进行风险分析,从而制定有效的措施,实质上是对化工生产过程进行安全性评价。     

基于ALOHA的氯乙烯储罐泄漏事故模拟研究

为控制危险化学品泄漏引发的事故危害,提高化工生产本质化安全,以天津市滨海新区某化工厂氯乙烯储罐为例,在事件树方法预测其泄漏后果的基础上,分析各后果发生的可能性,利用ALOHA对其后果影响范围进行模拟,得到可能事故场景下的氯乙烯毒气扩散区域、闪火可燃区域和蒸汽云爆炸超压冲击波影响区域,结果表明:毒气扩散事故影响范围最广,蒸汽云爆炸事故冲击波影响后果最严重。根据卫星云图对影响范围进行实地拟合,按照事故后果严重程度划分不同级别的警戒区域,针对各级别提出切合实际的日常管控措施和应急救援对策。该研究为氯乙烯泄漏事故预防管理和救援处置提供有效信息,为危化品泄漏事故的预防管控提供新方法和新思路。     

输油调度常见事故及防范措施

管道运输因运输量大、连续、迅速、经济、安全、可靠、平稳及自动控制程度高等优点而成为国内外油品输送的主要方式.近年来我国输油管道技术的发展速度突飞猛进,而输油调度在油品输送过程中,对现场设备进行控制并对各运行参数进行监控,在管道输送过程中起着中枢神经的作用.随着管道快速发展,管道输送过程中也会不可避免地遇到各种各样的生产事故,在调度日常工作中常见的有憋压,混油,冒罐等事故,为了便于生产人员真正吸取以往事故、事件中的经验教训,在日常生产运行过程中杜绝类似事件的发生,确保生产安全,特列举近年来某管道生产过程中发生的典型生产事故、对其发生的原因进行分析并提出防范措施,尽量减少或避免今后此类事故的发生.     

灰色系统理论在安全——事故预测中的应用

众所周知,事故即人们在日常生产中,由于受到科学技术知识和能力的限制而发生的意外的人身伤害或物质损失的事件,此事件为事物的现象,依唯物辩证法,现象是事物的外表形态;是事物的本质在各个方面的表现,本现象是对立统一的。所以,事故所表现的本质是安全。二者都是较为复杂的系统,而他们的对立统一关系又构成了安全——事故系统。安全预测技术就是运用现代预测技术的原理对安全——事故系统中的信息进行相关     

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.     

A computer generator for randomly layered structures

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

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。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

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     

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

正~~     

An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

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.     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.