关于人防地下室通风设计的几点思考

对于在进行人防地下室的通风设计中遇到的一些问题,（如风机的选型设计、平战结合的处理连接等）及自己对工程的风机房布置的一些看法进行阐述。     

既有混凝土建筑与新建钢结构建筑连接设计分析

本文对改、扩建工程的基本思路进行了描述,然后结合实际,以某工程为例,对工程中既有混凝土建筑与新建钢结构建筑连接设计中的一些情况以及问题进行了分析,并在关键问题上,如对钢梁和原有钢筋混凝土柱的连接、钢梁与和原有的混凝土梁的连接、新老建筑地下室底板衔接处放水节点的处理等,本文的目的就是为了为以后在工程中遇到此类问题提供参考。     

某中学教学楼抗震加固设计研究

通过工程实例的介绍,强调在加固设计中充分注重改善结构体系,提高房屋的整体抗震性能,加强构件的连接构造等设计理念;文章从方案选择、计算分析、节点构造等几个方面总结了加固设计的方法,希望为工程建设者提供一些经验和参考。     

高速公路与城市关系的探讨

高速公路是连接城市、满足城市间快速交通需求的公路运输载体,是为城市而生、为城市而服务的.依据国家高速公路网规划目标,高速公路是连接目前(编制年)城镇人口超过20万的城市的高效运输网络.作为高速公路与城市结合最为紧密的环城高速公路,多年来在规划和设计上并未给予足够的重视,出现了一些不尽人意的现象.随着人们对高速公路愈来愈多地了解,过去一些观点也在发生着变化.     

关于钢结构连接中螺栓合理排列问题的探讨

钢结构螺栓连接中的螺栓排列问题除了需要考虑受力、构造和施工要求,还要特别考虑截面削弱和截面受力的问题。不同的螺栓排列方式,净截面强度是不同的。本文通过具体实例说明螺栓连接的合理排列问题,为土木工程专业钢结构课程的教学和钢结构设计提供一些参考。     

公路工程测量教学和实践探析

本文描述了工程测量中一些较敏感的问题，如怎样连接联测导线、测量和设计中人员的合理安排以及CAD软件比较规划的标识方法和导线布置图等在教学和实践工作中运用的知识，并对测量精度进行了分析，得出一些有益的结论供相关人员作为参考。     

健美操团体动作的编排与创新

从音乐选配、动作设计、队型变化、连接配合等方面对健美操六人操编排与创新提出了一些建议。     

取水头部设计与施工要求

本文主要介绍本人承担的广州市自来公司某水厂扩建工程取水泵站取水头部设计，重点对钢管混凝土桩、连系梁、承台连接的设计以及对施工要求的一些问题作介绍。     

基于实例的钣金工艺设计技术研究

钣金工艺对于板会的设计以及制造等起着重要的连接作用,钣金设计以及制造水平随实践和技术的发展不断的提高,但是我们看到钣金工艺的设计水平还是相对滞后的,在很大程度上制约了整体生产效率的提升。本文从基于实例的钣金工艺设计出发,分析当前存在的一些问题的基础上来讨论想过的技术措施。     

钢结构高强螺栓连接设计的探讨

通过在施工与设计上对高强螺栓摩擦型连接设计与承压型连接进行对比,提出了按照承压型连接在其应用范围内具有的明显的优势,建议在设计中予以积极推广。另外,对于我国规范未提及的镀锌高强螺栓、具有镀锌涂层摩擦面、栓焊混合连接、在非标准孔情况下高强螺栓摩擦型连接承载力设计等问题,提供了国外的相关规范作为参考。     

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.     

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.     

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)

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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).     

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.