1,1,1,2,3,3,3-七氟丙烷的热力性质

为获得不破坏臭氧层的环保工质的热物性数据 ,对HFC- 2 2 7ea的热力学性质进行了研究 ,精确测量了 2 43～375 K的饱和蒸气压 ,使用膨胀 -定容法测量了 2 78～ 377K,压力 0 .2 6～ 2 .6 MPa的 HFC- 2 2 7ea的气相 p VT性质 ,温度和压力测量的最大不确定度分别为± 10 m K和± 5 0 0 Pa。使用测量结果关联了 HFC- 2 2 7ea的蒸气压方程 ,导出了维里系数、饱和气相密度、饱和蒸发焓 ,并关联了截断维里型的状态方程用于再现 HFC- 2 2 7ea气相区的热力性质。     

二甲醚热物理性质的研究

对二甲醚热物理性质的研究现状进行了详细分析,同时对西安交通大学在二甲醚热物理性质,包括临界参数、饱和气液相密度、饱和蒸气压、标准沸点、偏心因子、气相PVT性质、维里系数、表面张力、饱和液相粘度等方面的研究进展进行总结和分析,提供了相关的计算方程.其中饱和液相和气相密度方程的温度适用范围为301～400K,计算的不确定度小于0 35%和4 83%,饱和蒸气压方程的温度适用范围为233～400K,计算的不确定度小于0 1%,气相PVT方程的适用温度范围为298～353K,计算的不确定度小于0 5%,表面张力方程的适用温度范围为213～368K,计算的不确定度小于0 2mN·m-1,粘度方程的适用温度范围为227～343K,计算的不确定度小于2 0%,为其他研究人员今后从事二甲醚的应用研究提供了急需的基础热物性数据.     

氢氟烃(HFC)二元混合物表面张力测量

氢氟烃(HFC)混合物是长期性的制冷剂替代物,其表面张力数据对于制冷空调设备的设计计算必不可少。对HFC-32/125,HFC-32/134a,HFC-32/227ea,HFC-143a/227ea和HFC-143a/134a5种二元混合制冷剂的表面张力进行了实验研究,用毛细管内液面上升高差法(DCRM)精确测量了其253～333K的表面张力数据,温度和表面张力的最大不确定度分别为±10mK和±0.15mN.m-1。使用测量结果拟合得到了对应混合工质的表面张力关联式,并与目前已有的文献数据进行了比较。     

HFC-227ea的MBWR状态方程

以文献提供的大量精确P订实验数据为基础，拟合了制冷工质七氟丙烷HFC-227ea的modified benedict—webb-rubin（MBWR）状态方程，给出了32个参数值．该方程适用压力从0．03至53MPa，密度从2．9至1800kg／m^3，温度从204至473K．将该方程计算的HFC-227ea的pVT数据与实验数据比较后表明：两者的气相压力平均绝对值偏差为0．296％，饱和蒸气压平均绝对值偏差为0．213％，液相密度平均绝对值偏差为0．148％．     

二甲醚饱和液相导热系数的实验研究

研制了高精度瞬态双热线法导热系数测量装置及数据采集系统,整个测量系统的不确定度小于±1%.用液相甲苯标定213~363 K温度区间的饱和液相导热系数,并与标准值进行了比较,测量的平均偏差为0.37%,最大偏差为0.73%.用此装置对245~385 K温度区间的二甲醚饱和液相导热系数进行了实验研究,利用测量得到的饱和液相导热系数数据,拟合了二甲醚饱和液相的导热系数方程,该方程的计算值与实验数据的平均偏差为0.32%,最大偏差为0.85%,为二甲醚作为替代制冷剂和替代燃料等研究提供了急需的热物性数据.     

HFC-227ea的焓、熵、比热容计算

根据熵、内能及焓等物性参数的微分关系式,利用HFC-227ea的MBWR状态方程（pVT关系式）及比热容的关系式,推导了HFC-227ea的焓、熵、比热容的计算方程,并给出HFC-227ea的压焓图（p-h图,温度245-455K,压力0．03-10MPa,密度2～1500kg／m^3）和温熵图（T-s图,温度235-450K,压力0．0015～20MPa,密度0．2～1400kg／m^3）,以及比定压热容曲线图（cp-T图,温度280-460K,压力1～5MPa）．     

293～347 K温度区间二甲醚饱和蒸气压的实验研究

为了给二甲醚作为替代燃料和制冷剂的研究提供基本物性数据 ,对 2 93 7762～ 3 47 464 3K温度区间的二甲醚饱和蒸气压进行了测量 ,其中实验结果的温度不确定度小于± 2mK ,压力不确定度小于± 0 7kPa .同时 ,利用获得的实验数据拟合了一个新的Wagner型二甲醚饱和蒸气压方程 ,新方程与实验结果的平均偏差为 0 0 2 3 % ,最大偏差为 0 0 96% ,适用温度范围为 2 93～ 40 0K .     

碳酸二甲酯饱和液体粘度的实验研究

为将碳酸二甲酯作为替代清洁燃料的研究提供基本物性数据，使用改型的乌别洛特毛细管粘度计对283.273～383.104K温度区间的碳酸二甲酯饱和液体粘度进行了实验研究，并利用实验得到的饱和液体粘度实验数据，拟合了碳酸二甲酯饱和液体的粘度方程。实验结果表明，粘度测量结果的不确定度小于3．0％，实验数据与粘度方程的最大偏差为2．10％，平均偏差为0．58%。     

热线探针测定液体导热系数及其校正

本文深入研究了线热源探针和它的测试条件与理想线热源的求解边界条件之间不可能完全一致后,提出了利用实验所得数据回归的近似式进行自身校正的“两点式还原法”;使探针测定导热系数的准确度和可靠性提高到一个新的高度,扩大了探针的适用范围。所测定的水和甲苯等介质的导热系数与近期发表的据认为是最准确的数据相比,不确定度在±0.72%以内。     

PR导热系数普遍化模型及其精度预测分析

在原PR导热系数模型基础上，改进建立了一个PR导热系数普遍化模型，在温度80～1400K和压力0.1～350MPa内对油气藏流体中常见的22个纯组分的气、液相导热系数总共3263个数据点进行了拟合，总平均相对误差为7．34％。对13个二元和三元混合物总共260个数据点预测的总平均相对误差为7．94％；对3个石油馏分总共22个数据点导热系数预测的总平均相对误差为9．68％。对极性纯物质的总共810个数据点预测的总平均相对误差为6．86％；对极性二元混合物的共439个数据点预测的总平均相对误差为6．03％。该模型的计算精度明显优于石油工程中常用的导热系数模型。     

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).     

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.