一种基于手写签名的网络责任文件认证系统

研究一种网络责任文件认证系统。网络消息的认证通常采用基于公钥体制的数字签名方法．尽管数字签名在理论上已发展得较为成熟，但在应用方面仍存在若干不足考虑到手写签名验证方法在个人通信网络身份认证中的良好发展前景，采用将数字签名与手写签名相结合的方法，使系统既保留了数字筌名应有的特性，又具有手写签名对责任文件的认证作用。     

前所未有的历史机遇

炎炎的夏季，信息化建设好戏连台。近期国务院办公厅下发了关于《鼓盛软件产业和集成电路产业发展若干政策》的文件，文件提出的政策目标和鼓盛政策，对于加快我国软件和集成电路产业的健康、有序发展营造了十分有利的环境。全国政府系统办公自动化协作网络技术咨询组汇聚春城，共同研讨政府系统办公自动化“十五”规划，提出要高起点、高质量地加快全国政府系统办公自动化的建设和应用，预示着我国政府信息化即将迎来前所未有的挑战和机遇。国际上，美国克林顿总统首次使用电子签名，使电子商务的发展又向前迈进了一步，而他首次发表网上演…     

IP网络性能测试系统的设计与实现

网络性能的实时监测已经成为一项必要的工作，网络性能测试终端正是这样一种设备。用嵌入式系统实现网络测试终端是一个理想的选择。文中介绍了一种以若干个测试终端组成一个测试网络来监控网络性能的方法，具体分析了嵌入式网络性能测试终端的软硬件设计，利用GPS解决多个测试终端时间同步的问题。给出了修改操作系统内核以获取高精度时间和文件系统设计及配置的方法。     

《龙岩学院学报》（双月刊）投稿规则

《龙岩学院学报》是经国家新闻出版总署批准的、国内外公开发行的本科大学学报。2007年1月9日龙岩学院专门发布文件《关于进一步加强学报专业化、规范化建设的若干规定》，现依据此文件，制订如下投稿规则：     

《龙岩学院学报》(双月刊)投稿规则

《龙岩学院学报》是经国家新闻出版总署批准的、国内外公开发行的本科大学学报。2007年1月9日龙岩学院专门发布文件《关于进一步加强学报专业化、规范化建设的若干规定》，现依据此文件，制订如下投稿规则：     

《龙岩学院学报》(双月刊)投稿规则

《龙岩学院学报》是经国家新闻出版总署批准的、国内外公开发行的本科大学学报。2007年1月9日龙岩学院专门发布文件《关于进一步加强学报专业化、规范化建设的若干规定》，现依据此文件，制订如下投稿规则：     

《龙岩学院学报》(双月刊)投稿规则

《龙岩学院学报》是经国家新闻出版总署批准的、国内外公开发行的本科大学学报。2007年1月9日龙岩学院专门发布文件《关于进一步加强学报专业化、规范化建设的若干规定》，现依据此文件，制订如下投稿规则：     

《龙岩学院学报》（双月刊）投稿规则

《龙岩学院学报》是经国家新闻出版总署批准的、国内外公开发行的本科大学学报。2007年1月9日龙岩学院专门发布文件《关于进一步加强学报专业化、规范化建设的若干规定》，现依据此文件，制订如下投稿规则：     

《龙岩学院学报》（双月刊）投稿规则

《龙岩学院学报》是经国家新闻出版总署批准的、国内外公开发行的本科大学学报。2007年1月9日龙岩学院专门发布文件《关于进一步加强学报专业化、规范化建设的若干规定》，现依据此文件，制订如下投稿规则：     

发达国家农村基础设施供给制度的经验

<正>新世纪以来指导"三农"工作的第7个中央一号文件于2010年1月31日公布,文件题为《中共中央、国务院关于加大统筹城乡发展力度,进一步夯实农业农村发展基础的若干意     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

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…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

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。     

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.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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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     

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