Riemann－CartanR＋R~2引力场方程和能量动量张量

给出一有挠Ｒ＋Ｒ２型引力理论的Ｅｉｎｓｔｅｉｎ方程和Ｃａｒｔａｎ方程．由广义位移交换下引力场作用量的不变性导出能量动量的协变守恒律，并求得了引力场的能量动量张量和超势．     

Riemann—Cartan R＋R^2引力场方程和能量动量张量

给出一有挠Ｒ＋Ｒ＾２型引力理论的Ｅｉｎｓｔｅｉｎ方程和Ｃａｒｔａｎ方程，由广义位移变换下引力场作用量的不变性导出能量动量的协变守恒律，并求得了引力场的能量动量张量和超势。     

一种定域洛伦兹规范协变的有挠时空引力理论(下)(英文)

本文建立了一种符合定域洛伦兹规范协变的有挠时空引力理论。它是爱因斯坦引力理论在有挠时空中的推广,它是考虑了物质自旋的引力理论。它消除了爱因斯坦引力理论与狄拉克电子理论之间的矛盾。本文中新的引力理论自然地要求:应该存在一种新的独立的第五种力场—自旋场。本文表明:(1)符合定域洛伦茨规范协变的有挠时空引力理论包括引力场运动方程和自旋场运动方程。(2)引力场运动方程与爱因斯坦理论一样包含能量动量运动定律。(3)自旋场运动方程包含角动量运动方程。(4)本文建立的引力场理论一定程度上等价于一种特殊的爱因斯坦-嘉当理论,因此我们称之为爱因斯坦-嘉当-唐理论(ECT理论)。本文的对应于黎曼-嘉当几何的挠率张量分解为标架场的微分和自旋场。(5)真实的物理时空应该是由引力场(标架场)和自旋场(标架仿射联络)描述的有挠时空,其时空几何是黎曼-嘉当几何。本文中,挠率张量表征引力场场强,曲率张量表征自旋场场强。     

一种定域洛伦兹规范协变的有挠时空引力理论

本文建立了一种符合定域洛伦兹规范协变的有挠时空引力理论。它是爱因斯坦引力理论在有挠时空中的推广,它是考虑了物质自旋的引力理论。它消除了爱因斯坦引力理论与狄拉克电子理论之间的矛盾。本文中新的引力理论自然地要求：应该存在一种新的独立的第五种力场-自旋场。本文表明：（1）符合定域洛伦茨规范协变的有挠时空引力理论包括引力场运动方程和自旋场运动方程;（2）引力场运动方程与爱因斯坦理论一样包含能量动量运动定律;（3）自旋场运动方程包含角动量运动方程;（4）本文建立的引力场理论一定程度上等价于一种特殊的爱因斯坦-嘉当理论,因此我们称之为爱因斯坦-嘉当-唐理论（ECT理论）。本文的对应于黎曼-嘉当几何的挠率张量分解为标架场的微分和自旋场;（5）真实的物理时空应该是由引力场（标架场）和自旋场（标架仿射联络）描述的有挠时空,其时空几何是黎曼-嘉当几何。本文中,挠率张量表征引力场场强,曲率张量表征自旋场场强。     

ECT自旋-引力场理论在黎曼背景时空下的表述和规范条件

ECT自旋-引力场理论(或称TFL自旋-引力场理论)是Einstein引力场理论在有挠弯曲时空中的推广理论,它消除了Einstein引力场理论与Dirac电子场理论之间的矛盾,其简化形式的ECT自旋-引力场理论有Einstein引力场理论极限,因此,它应是比Einstein引力场理论更加正确的引力理论.标准的ECT自旋-引力场理论认为自旋-引力场完全是一种有挠弯曲时空的几何结构,为了得到清晰的物理图像和对具体的引力问题进行分析,我们需要认为自旋-引力场也是一种在黎曼背景时空下的动力学场.本文将ECT自旋-引力场理论中的自旋-引力场看作是黎曼背景时空的几何结构及在黎曼背景时空下的动力学场的复合体,自旋-引力场在给定黎曼时空背景下的物理效应用动力学场描述.应用这种思想,我们建立了ECT自旋-引力场理论在黎曼背景时空下的表述,并且在黎曼背景下讨论了自旋场和引力场的规范条件.     

形式守恒量在物理学中的应用

作者通过摩擦谐振子的能量 ,说明了在物理学中形式守恒量的意义 .然后 ,根据经典引力场中守恒的龙格 -楞次 (Runge -Lense)矢量对斯瓦兹西德场为形式守恒量 ,用牛顿引力势的相对论修正项讨论了水星近日点进动 .最后 ,导出了带电粒子在假设的磁单极子场中作非有心力稳定运动的守恒矢量 ,并讨论了该矢量因电磁辐射而成为形式守恒量后对运动轨道的影响 .     

引力场方程的新标架形式及定域化的引力场能量动量张量

本文通过引入标架空间定叉了引力场场强张量和引力场拉格朗日密度,根据最小作用量原理导出了引力场运动方程的一种新的半度规形式(或称标架形式)及具有标架空间和坐标空间的双重协变的引力场能量动量张量.我们用这种定域化的能量表达式和球对称真空外部场席瓦兹希德解(当β1+β2=0,B3=0时)计算出在r≥R区域中的球对称引力场的总能量为E=MC2 1-√1-2GM/C2R/1+√1-2GM/C2R.它把爱因斯坦引力理论作为一个特例(满足条件β1=β2=β3=0)包含其中,是对爱因斯坦度规引力理论的重大发展.本文通过求解球对称真空外部场解得到以下结论:满足条件β1+β2=0,β3=0时的球对称真空外部场解就是席瓦兹希德外部解,基于球对称真空外部场解的任何检验Einstein引力场方程的实验验证都无法确定Einstein引力场方程是唯一正确的.最后根据粒子在引力场中的运动方程确定了待定常数的值为β1=2β,β2=β3=0.本文得到的引力理论与平移引力理论具有相同的形式.本文建立的引力理论采用的几何是黎曼几何,没有采用平移引力理论中的weitzenbock几何,并且对其中的能量问题和待定常数问题作了更深入的讨论.     

平移引力规范理论中的能量动量及其哈密顿表述

分析了平移引力规范理论中引力场的能量动量的变换特性,证明了引力场的能量动量可以表示为洛仑兹规范势的二次齐式因而在局域洛仑兹变换下不协变。另一方面,引力场的能量动量又可以表示为平移规范场强的二次齐式因而在广义坐标变换下协变。给出平移引力规范理论的一个新的简化的哈密顿表述,其约束代数与广义相对论的约束代数形式相同,从而证明了平移引力规范理论与广义相对论在哈密顿表述下的等价性。     

一种标——张量引力理论的引力波辐射

本文通过一种单位变换导出了文献[4]提出的标—张量引力理论方案的另一种表述形式,由此得到的引力场张量方程和守恒律完全类似广义相对论的Einstein方程和守恒律;变换后的标量场视为“物质场”,在张量方程中起着一种“引力源”的作用。应用变换后的理论表述研究引力辐射问题,其结果是引力场的总辐射强度为引力张量场和引力标量场的辐射强度之和。求出了引力张量场和引力标量场的辐射强度公式,详细地讨论了双星的引力波辐射。     

挠率几何与有挠引力

本文提出一种统一描述引力场、规范场及自旋自相互作用的纤维丛理论.它把现有的挠率概念包含在其中,如Cartan理论、Brans-Dicke理论、规范引力理论等.本文还给出了一种拉伸纤维的映射,它为进一步探讨挠率产生的几何机制和物理机制提供了新的研究方式.     

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.