城市交通通口污染特征及控制对策研究

通过对交通路口娥浓度,车流量和气象调查和监测,研究了污染物的特征及其与交通流量和气象因子的对应关系。结果表明（１）车流量随时间变化明显。（２）污染物浓度与车流量有较为密切的关系。（３）交通噪声随车流量增大,声级值也相应增大,影响交通噪声的实质因素是机动车的车速和车间距。     

基于MIV-BP神经网络的公交场站污染物暴露水平测评

为了研究城市居民在公交场站污染物暴露水平下的影响程度, 分析交通、公交场站、气象条件及周边环境对污染物浓度的影响, 本文通过测量早晚高峰以及平峰期间的PM2.5浓度、CO浓度、风速、温度、车流量等10个因素, 采用平均影响值（MIV）与BP（back propagation）神经网络相结合的方法, 确定公交场站污染物暴露水平的主要影响因素, 并在此基础上建立MIV-BP神经网络测评模型。评估结果表明：公交场站PM2.5的暴露浓度与公交停靠站类型、车流量、小车流量、大车流量、风速、湿度、降雨量有关;CO的暴露浓度与瞬时停靠车辆数、公交停靠站类型、湿度、风速、温度、车流量有关;改进后的MIV-BP神经网络模型较BP神经网络具有更高的预测精度和准确度, 可有效对公交场站污染物暴露水平进行测评。     

厦门西海域二氧化碳体系

由ｐＨ和碱度测定值计算了厦门西海域海水中ＣＯ＿２体系及ＣａＣＯ＿３的饱和度，结果表明ΣＣＯ＿２、和ＣＯ＿［２（．Ｔ）］的浓度分别是１．９６～２．３０ｍｍｏｌ／Ｌ、１．８２～２．１６ｍｍｏｌ／Ｌ、０．１０～０．１２ｍｍｏｌ／Ｌ和０．０１７～０．０２６ｍｍｏｌ／Ｌ。ＣａＣＯ＿３的饱和度是１５０．１％～２０８．５％。讨论了叶绿素ａ对ΣＣＯ＿２和ＣＯ＿（２（Ｔ））的影响以及ＣａＣＯ＿３饱和度与Ａｌｋ的关系。     

过氧化氢对小麦种子萌发和幼苗生长的影响

试验结果表明，外源Ｈ２Ｏ２浓度低于０．４％时，对小麦种子萌发有促进作用；Ｈ２Ｏ２浓度超过０．４％时，则抑制种子萌发，其抑制程度随着Ｈ２Ｏ２浓度的增大而加强；Ｈ２Ｏ２对主胚根和胚芽的伸长均有抑制作用，并且对主胚根的抑制强于胚芽；低浓度（小于０．４％）Ｈ２Ｏ２能够促使侧生胚根的伸长，增加胚根数；叶片中ＰＯＤ活性和ＭＤＡ含量与Ｈ２Ｏ２浓度均存在密切的相关性。     

常用化肥对长沙多索线虫生活力的影响

研究了五种氮肥对长沙多索线虫生活力的影响，结果表明，对成虫，ｗ（ＣＯ（ＮＨ２）２大于２．０％，ｗ（ＮＨ４ＮＯ３）大于１．０％ｗ（ＮＨ４）２ＳＯ４）大于０．２５％ｗ（ＮＨ４ＣＩ）大于０．５％时就有致死作用；而ｗ（ＮＨ４ＨＣＯ３）的致死作用更强，浓度大于０．１％时线虫死亡，对寄生前期幼虫，四种常用化肥的质量分数大于０．２％时致死或抑制其活力。     

模拟污水中氮,磷对水稻劝苗过氧化氢酶和乙醇酸氧化酶…

以水稻为材料，研究了不同深度的模拟污水中Ｎ、Ｐ对幼苗过氧化氢酶（Ｃａｔａｌａｓｅ，ＣＡＴ，ＥＣ１．１１．１．６）、乙醇酸氧化酶（Ｇｌｙｃｏｌａｔｅｏｘｉｄａｓｅ，ＧＯ，ＥＣ１．３．３．１）、过氧化和物酶（Ｐｅｒｏｘｉｄａｓｅ，ＰＯＤ，ＥＣ１．１１．１．７）和叶绿素含量的影响。结果表明：低浓度Ｎ、Ｐ浓度分别超过８．５６ｍｍｏｌ．Ｌ＾－１和０－０．２ｍｍｏｌ．Ｌ＾－１范围）可诱导ＣＡＴ活性增大，而后下     

亚硒酸钠对麦穗鱼的遗传毒性效应研究

４ｐｐｍ的Ｎａ２ＳｅＯ３对麦穗鱼的微核率有显的影响（Ｐ＜０．０５），所以ｓｅ在定浓度下是致突变剂，而０．１ｐｐｍ的ＮａＳｅＯ３对麦穗鱼的核异常率有极显的影响（Ｐ＜０．０１），因此，０．１ｐｐｍ应视为有毒效应浓度。麦穗鱼可用作淡水水体致突变物污染的监测生物。     

三辛基氧化磷（TOPO）萃取钯机理的研究

本报道了三辛基氧化磷（ＴＯＰＯ）从高氯酸体系中萃取钯的机理。结果表明：钯的萃取率随ｐＨ的增大而增大与高氯酸根离子浓度无庆,采用斜率法测得萃合物组成为：Ｐｄ．Ｌ４。萃取反应方程为：４ＴＯＰＯ（Ｏ）＋Ｐｄ＾２＋（Ａ）＋２ＸＩＯ４＝「Ｐｄ．ＴＯＰＯ４」（ＣＬＯ４）２（０）。     

Nd_(0.9)Ca_(0.1)Ba_2Cu_3O_(7-δ) 超导体的结构

用固相反应法制备，并通过不同条件的热处理得到了一组不同氧含量的Ｎｄ０．９Ｃａ０．１Ｂａ２Ｃｕ３Ｏ７－δ样品。用ＸＲＤ确定了预烧粉末的结构特征，发现其为（Ｎｄ，Ｃａ，Ｂａ）ＣｕＯ３钙钛矿结构，较之典型立方钙钛矿（ＳｒＴｉＯ３）出现新的１１３峰，且晶胞参数相应增大了一倍。随着氧含量的增大，Ｎｄ０．９Ｃａ０．１Ｂａ２Ｃｕ３Ｏ７－δ的结构发生从四方到正交相变，并讨论了其结构与超导电性的关系。     

（Ba_（1－x）Nd_x）TiO_3系陶瓷的电性能

研究了不同Ｎｄ３＋浓度（０．１ｍｏｌ％～２ｍｏｌ％）掺杂的ＢａＴｉＯ３陶瓷的电性能．结果表明，当Ｎｄ３＋浓度为０．１ｍｏｌ％～０．２ｍｏｌ％时，轻度Ｎｄ３＋掺杂的ＢａＴｉＯ３陶瓷是半导性，而当Ｎｄ３＋为０．６ｍｏｌ％～２ｍｏｌ％时呈绝缘性．ＢａＴｉＯ３陶瓷室温下的体电阻车ρＶ随Ｎｄ３＋浓度的变化呈Ｕ型特性曲线，当Ｎｄ３＋＝０．１５ｍｏｌ％时材料具有最低的ρＶ和最佳的正温系数（ＰＴＣＲ）效应，相应于最大的平均晶粒尺寸ＡＧＳ和介电常数ε。随着Ｎｄ３＋浓度的增加．材料的ε和居里常数Ｃ下降，同时ε与Ｃ值密切相关．ＳＥＭ照片显示了Ｎｄ３＋含量对材料晶粒尺寸的强烈影响．此外，还分析了ＺｒＯ２对（Ｂａ１－ｘＮｄｘ）ＴｉＯ３系陶瓷电性能的影响．     

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)

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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.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.