我国取得了信息存储密度比国外相关研究高一个数量级的重要成果

 在国家自然科学基金的连续资助下 ,中科院北京真空物理开放实验室、中科院化学所、北京大学电子学系、北京大学化学学院科研人员组成的联合科研小组 ,采用与国外不同的原理、设计和方法 ,设计、制备了一系列新型有机复合和有机分子信息存储薄膜 ,成功地实现了超高密度的信息存储 ,在有机超高密度信息存储材料领域取得了一系列突破性进展 ,在《应用物理快报》（Ａｐｐｌ．Ｐｈｙｓ．Ｌｅｔｔ．）、《物理评论快报》（Ｐｈｙｓ．Ｒｅｖ．Ｌｅｔｔ．）等国际上有重要影响的杂志上发表了多篇论文。     

我国取得了信息存储密度比国外相关研究高一个数量级的重要成果

在国家自然科学基金的连续资助下 ,中科院北京真空物理开放实验室、中科院化学所、北京大学电子学系、北京大学化学学院科研人员组成的联合科研小组 ,采用与国外不同的原理、设计和方法 ,设计、制备了一系列新型有机复合和有机分子信息存储薄膜 ,成功地实现了超高密度的信息存储 ,在有机超高密度信息存储材料领域取得了一系列突破性进展 ,在《应用物理快报》（Ａｐｐｌ．Ｐｈｙｓ．Ｌｅｔｔ．）、《物理评论快报》（Ｐｈｙｓ．Ｒｅｖ．Ｌｅｔｔ．）等国际上有重要影响的杂志上发表了多篇论文。１９９６年他们采用自行设计、合成和制备的全有…     

超高密度信息存储材料及技术研究进展

信息技术的飞速发展,要求不断开发出具有更高信息存储密度及更快响应速度的材料和器件,因而在纳米尺寸上实现信息存储功能的新型超高密度信息存储材料已成为当前信息领域一个发展速度快、学科交叉多、竞争十分激烈的研究热点.简要介绍了近年来该领域主要的研究方法,并着重对利用扫描隧道显微镜/原子力显微镜(STM/AFM)写入信息的存储材料的最新研究进展进行了综述.     

有机—无机纳米复合材料的研究进展

综述了有机－无机纳米复合材料的最新发展,包括该类材料的制备方法、性能研究和应用前景．三种主要的纳米复合技术为溶胶－凝胶法、嵌入法和纳米微粒填充法．纳米复合材料的光学和磁学等性能可用Ｍａｘｗｅｌ形态理论、层状结构理论和分形结构理论等来研究．这类材料已在力学、热学、电学、磁学、光学、宇航和生物仿生等领域表现出广泛的应用前景．     

信息存储材料:电子器件从"吉时代"到"太时代"跨越

随着信息技术的飞速发展,人类要处理的信息量与日俱增,要求不断开发具有更高信息存储密度及更快响应速度的材料和器件。如何提高读写速度、实现纳米尺度信息存储是目前迫切要解决的问题。超高密度信息存储是指信息存储密度大于1012比特／平方厘米（1太比特／平方厘米）,实现从电子器件从“吉时代”到“太时代”的跨越。与目前市售电子器件的存储密度相比,其信息存储能力堪称惊人。超高密度信息存储材料和器件作为纳米电子学的重要内容之一,将为未来信息技术的发展奠定理论和技术基础。     

快速超高密度外存储基础技术通过鉴定

快速超高密度外存储基础技术通过鉴定我校计算机外存储系统国家重点专业实验室研制的一种新技术能使目前磁盘存储器的信息容量扩大一个数量级，接收速率提高３倍．“快速、超高密度外存储基础技术”已于２月中旬通过了鉴定．专家鉴定认为，该课题研究水平达到了当前国际先...     

提高光盘信息存储的关键技术

本文从光盘的存储密度、数据传输率和超高密度存储三个方面讨论了提高光盘信息存储的关键技术。     

21世纪最有前途的材料Ⅱ——纳米材料的制备与应用

主要介绍了二维纳米薄膜、三维纳米晶体材料和纳米复合材料的制备方法。探讨了各种方法的特点与适用性,并展望了纳米材料在催化、光学、电学、磁学,传感器、陶瓷及生物医学等领域的应用前景。     

一维纳米结构材料的制备与组装

一维纳米结构材料在纳米电子学、纳米光电子学、超高密度存储和扫描探针显微镜诸多领域具有潜在的应用前景,已成为21世纪化学、物理学、材料学及生命科学等科技领域的研究热点。结合近期研究工作,主要介绍了一维纳米结构材料的制备方法和组装策略,并简要概述了一维纳米结构材料的应用前景及其国内外最新研究进展。     

尿素-NaBr低温熔盐体系中Er-Co合金的电沉积

稀土元素内层４ｆ电子的数目从０～１４逐个填充,造成它们之间在光学、磁学、电学性能上出现明显差异．衍生出种类繁多的高新材料［１］．稀土铁族金属合金具有优良的磁性、磁光性并可应用于磁性元件及磁光记录材料,目前多采用蒸镀和激光溅射法制备．但设备成本高、生...     

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.