公路施工组织网络资源优化的启发式算法

对于工期限定、资源均衡和资源有限、工期最短的2种资源约束情况，分别提出了逐步调优法和资源分配法2种启发式算法。在工期限定、资源均衡中，通过利用平衡性指标变动公式计算非关键工序的ΔHR值作为工序能否进行移动的判定界限，且应用平衡性指标HR作为网络计划实现优化的定量指标。在资源有限、工期最短中，通过计算每道工序的优先系数Pij，按其值由大到小作为各工序调整的优先准则，从而合理安排各工序的开始时间，以保证实现网络的资源优化。     

资源受限条件下公路工程进度计划优化方法

针对资源限制条件下的公路工程进度安排问题，讨论了资源分配的优先准则和工作调整步骤，对比分析了优先系数方法和资源调配方法的优化结果，在优先系数计算公式中考虑“工作最早完成时间”参数，对优先系数计算公式进行了改进，以提高模型的适应性；应用“约翰逊-贝尔曼”法则，对新参数的合理性作了进一步论证。分析结果表明，改进后的模型能够更合理地确定发生资源冲突时各项工作的先后顺序，可迅速有效地得到资源限制条件下的最短工期计划。     

多资源均衡的网络计划优化方法

给出了可行计划、可行部分计划等一些概念，介绍了可行部分计划间的优势关系以及与之有关的两个定理，在此基础提出了一种解决工期最短、多资源均衡的网络计划方法。     

复杂工程施工系统资源优化模型及其应用

对于复杂工程施工系统，工期一定、资源均衡的资源进度计划是需要解决的一个重要且有相当难度的问题．首先利用程序实现了在工程实践中运用的两种经典模型，即削峰填谷模型和最小方差模型，并对比分析了各自的特点；然后引入近年发展起来的遗传算法模型，并加以改进实现．最后将三种模型应用到某大型水电站地下洞室群施工系统资源优化中，获得了各自的仿真优化计算结果．通过比较分析可知，遗传算法模型相对最优，能够很好地满足实际的施工需要。同时也为此类问题的模型选择提供了依据．     

一种网络计划的综合优化模型

从网络计划中工期、费用和资源三者的综合优化更具有理论、现实和经济上的意义出发 ,提出了一种综合优化模型 .首先进行工期 费用的优化 ,再进行资源有限 工期最短的优化 ,最后运用模糊综合评判选出最优的方案 .在该优化方法的基础上 ,开发了综合优化的软件系统 ,并已用于实际工程 ,取得满意效果     

一种网络计划的综合优化模型

从网络计划中工期、费用和资源三者的综合优化更具有理论、现实和经济上的意义出发,提出了一种综合优化模型。首先进行工期－费用的优化,再进行资源有限－工期最短的优化,最后运用模糊综合评判选出最优的方案,在该优化方法的基础上,开发了综合优化的软件系统,并已用于实际工程,取得满意效果。     

CPM中工期分阶段控制及资源消耗均衡优化

本文为解决工程计划中分阶段控制工期问题,在CPM网络的基础上提出一种新的网络形式—连锁网络、及其相应的工期控制数学模型与计算方法;针对这种网络计划中的一种主要资源消耗均衡优化问题,给出数学模型及其求解方法,对多种资源消耗均衡优化问题提出简便的处理意见;并介绍了为实现上述两目标所编制的通用电算程序的功能及其适用性.     

结合工期与成本的工程管理优化方法

在建筑工程中，工期短、成本低、质量优是人们追求的目标。其中，工期与成本是相互联系和相互制约的，要加快施工速度、缩短工期，资源的投入就增加、有些费用也会增加，结果成本提高、效益下降。因此，费用优化是寻最低成本时的最短工期，或按要求工期条件下寻求最低成本的施工计划。     

网络计划的优化在工程进度控制中的应用

简要介绍网络计划技术,分析了资源有限,工期最短及工期—成本优化原理,并通过实例表示优化计算的方法与过程。     

多模式下装配式建筑工程资源受限调度方法

针对以往装配式建筑调度研究中,主要基于一个活动只有一种固定资源投入和固定工期的执行模式,而实际调度过程中多种资源投入和不同工期的多种执行模式普遍存在的问题,以及装配式建筑一体化建造建模方法的不足,建立以装配空间工期最短,以及在装配空间工期最短限定下的生产空间工期最短的多模式资源约束模型,在该多维空间调度模型的基础上,设计了一种搜索能力强、能有效求解该问题的布谷鸟算法(CS)。最后通过装配式建筑项目实际案例分析和遗传算法(GA)的性能对比,证明本文构建的调度模型和算法设计能有效的解决多模式下装配式建筑工程资源受限调度问题,丰富了装配式建筑项目调度这一领域的理论方法。     

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…     

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.     

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).     

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。