基于防护速度的高速磁浮辅助停车区设置

为了在满足高速磁浮列车安全连续运行需求的前提下节约建设成本,提出了一种基于速度防护曲线的辅助停车区设置算法.在此基础上给出了一种基于基准运行速度曲线的辅助停车区算法,同时能满足多目标速度曲线并存的线路上列车安全连续运行的要求.考虑了列车运行控制系统安全性的要求,给出了工程应用中相应的辅助停车区调整方法,并在一定工况条件下进行了仿真计算,结果表明该辅助停车区算法能在一定程度上降低高速磁浮交通系统的建设成本.     

多目标列车节能调度模型及模糊优化算法

在保证行车安全、满足乘客需求的基础上,以节能为目标的列车调度模型及算法得到了广泛研究与应用。伴随着欧盟制定了全球首个碳排放交易体系,碳排放指标交易费用受到越来越多的重视,并逐步成为列车运营成本的重要组成部分。本文建立了以能耗成本、碳排放成本、列车运行时间为优化目标的单线列车调度模型,并采用多目标模糊优化算法进行求解。算例以一条铁路线路为研究对象,在Lingo下对算例进行求解分析,结果表明了多目标模糊优化算法具有很好的优化能力,并能达到节能减排的效果。     

基于多目标混沌遗传算法的列车控制策略优化

为得到一组满意的行车控制策略,构建了列车运行多目标模型,并以列车运行动力学模型为基础求得列车局部运行控制策略制定方法。使用基于混沌优化的多目标遗传算法对列车控制策略进行优化研究,以相位转换点作为基因序列,多个基因组成染色体形成一套控制策略。使用混沌初始化种群,结合精英保留策略,增加了种群的多样性,并提高算法收敛能力。最后采用Matlab软件仿真验证了方法的可行性及有效性。     

高速铁路区间完全中断场景双向到发线运用优化

针对高速铁路区间完全中断场景下的列车运行调整问题，提出了双向到发线运用优化策略。从宏观角度将列车运行过程抽象为由事件和活动构成的网络，对提出的双向到发线运用策略进行建模，建立高速铁路区间完全中断场景下列车运行调整混合整数线性规划（MILP）模型。根据现场实时性要求，采用自编算法与商业优化软件Gurobi相结合的方式对模型进行求解。运用模型和算法对构建的9个现场中断案例进行算例测试。结果表明，双向到发线运用优化策略可以有效减少中断事件对列车运行的影响，相比于目前到发线运用策略，最多可减少10%的列车延误时间。     

基于乘客等待时间的城市轨道交通列车运行调整模型

研究突发事件导致列车晚点情况下城市轨道交通列车运行调整问题.从乘客角度出发,提出了“首站控制”和“多站协调控制”两类列车运行调整策略.考虑列车能力约束和列车区间运行时间、追踪间隔时间等运行条件约束,以受突发事件影响的全部乘客等待时间最小为优化目标,建立了基于两类调整策略的列车运行调整模型,采用Lingo软件进行求解.以某简化线路为算例,与不采取控制策略相比,两类策略下乘客等待时间均节省约9％,结果表明了模型的有效性,能够为轨道交通列车运行调整提供辅助支持.     

考虑辅助停车区约束的中速磁浮列车速度曲线节能优化方法

在分析中速磁浮列车动力学模型和节能运行工况转换序列的基础上,提出一种先以运行线路参数为依据划分场景,然后在特定场景中以双限速度防护曲线的临界点为依据进一步细分区间的建模思想,进而构建满足目标运行时间约束下的多区间列车速度曲线节能优化模型,并给出一种基于不同运行工况转换点的求解思路以及多区间列车节能速度曲线的Pareto优化方法。研究结果表明:与现有列车速度曲线节能优化方法对比,本文优化方法针对磁浮列车运行的适用性和优化效果更好。     

求解复杂多目标优化问题MOEA/D-GEP算法

针对复杂多目标优化问题,提出一种基于演化建模的MOEA/D（基于分解的多目标遗传算法）求解算法（MOEA/D-GEP）.该算法利用MOEA/D算法思想分解多目标优化问题,对分解后得到的可行解用基于模拟退火的GEP算法建模,从中选取预测值较好的点进入下一次真实适应值的计算.采用国际公认的ZDT,DTLZ等测试函数进行实验验证,并与MOEA/D-EGO演化多目标优化算法进行了比较.实验结果表明：该算法在IGD性能指标上有较好的表现,说明将演化建模技术引入MOEA/D算法提高了种群个体分布模型的精度,降低了求解复杂多目标优化问题的计算成本.     

列车节能运行模型和操纵策略优化

分析了列车能量流程 ,描述了列车节能控制目标 ,并以站间运行时间和运行距离为约束条件 ,以列车运行能耗作为目标函数 ,给出了机械能模型以及具有有限手柄级位的列车离散型控制模型和无级控制连续型模型 .针对无级控制连续型模型 ,建立了哈密顿函数 ,并应用 Pontryagin算法得到了优化操纵策略和模型解     

利用模型管理框架求解多目标优化问题

为了提高演化算法的效率，减少优化时间，提出一种多目标模型管理框架。利用该模型管理框架可以在整个寻优区域内建立比较精确的目标及约束的近似模型，从而避免了大量耗时的高精度分析计算。将该多目标模型管理框架与单纯形-多目标粒子群算法（SM-MOPSO）相结合，对某轻型飞机齿轮箱减速器进行多目标优化设计，使高精确分析计算的次数减少88％。该多目标模型管理框架及SM-MOPSO算法可用于求解大型、复杂的工程优化问题。     

复杂建筑火灾中的人员疏散路径多目标规划

针对复杂建筑火灾中的人员疏散动态路径优化策略问题,以火灾情境下的动态疏散网络数据模型为基础,结合网络流优化和群智能方法,构建以最短时间、最小风险水平和最大疏散容量为目标的路径优化模型.通过改进的自适应果蝇算法,实现了节点和路径容量受限的动态疏散路径规划.通过对所建模型的性能测试和疏散过程实验,验证了多目标路径优化模型的有效性.实验结果也反映了多目标路径规划策略更加贴近复杂建筑火灾中的人员疏散实际情况,对于规划不确定因素影响下的复杂空间疏散路径具有可行性.     

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.