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<正>《云南民族大学学报(自然科学版)》为双月刊,逢单月10日出刊,主要刊登基础学科和工程技术的研究性学术论文.目前栏目有:化学与生物、民族药资源、数学及应用数学(经济、金融、统计等方向)、信息与计算机科学、电子电气与自动化、网络与通信技术、无线传感器网络技术、物理及相关学科、教育学与心理学、体育     

我国低压电器发展趋势展望

近年来,低压电器技术随着电子学、计算机科学、电弧等离子体物理、信息和网络以及材料科学的进展,取得了巨大的发展。本文以国内外最新资料为依据,从低压电器智能化与网络化,产品开发手段,环境保护和材料,传统低压电器的发展等几方面介绍低压电器近期发展动向。     

物理网络教学资源建设

随着计算机网络技术的发展,网络教学必将成为一种重要的教学手段,其教学模式也将会呈现多样化,有关网络教学的研究也将会进一步深化.文章从物理网络教学的理论入手,指出了网络教学在心理学、物理教育学等方面的理论依据,介绍了物理网络教学资源--网站制作的过程及评价,对网络资源在物理教学中的应用提出指导性的建议.     

论计算机网络安全问题及防范措施

网络安全是一门综合性学科,涉及到计算机科学、网络技术、密码技术、通信技术、信息安全技术、信息论等多种学科.随着计算机网络技术的广泛应用和飞速发展,网络安全已成为人们关注的焦点,并极力研究和探求科学、有效的安全防范措施.     

新工科背景下的计算机科学与技术专业建设研究

目前,信息已经渗透到社会各个领域,以云计算、大数据、区块链、物联网、机器学习和神经网络为技术基础的智能时代正到来,智能时代深刻地影响着计算机专业教育.从云南民族大学计算机科学与技术专业实际情况出发,系统介绍了计算机科学与技术专业的定位、发展目标以及基础条件,并以新工科为背景,探讨了专业建设中的具体内容以及改革举措.     

赛博空间隐性知识内涵及相关研究

信息时代,大量知识以数字化形式存在于赛博空间中,但是特定类型的数字知识只能被特定的数字系统(程序)直接使用,而不能被其它类型的数字系统充分利用,数字知识呈现相对"隐性"特征,深刻影响了数字知识的共享利用。针对这一问题,在对管理学和信息科学领域等隐性知识相关研究的基础上,提出了赛博空间隐性知识概念,从数字化的角度扩展了隐性知识的内涵,以知识科学与工程领域的数据挖掘和知识发现、机器学习、用户模型、企业应用集成、网格等方面,分析了赛博空间隐性知识的研究现状,并就传统隐性知识和赛博空间隐性知识的区别与联系进行了辨析,以及对下一步工作进行了展望。.     

计算机网络技术中大数据时代的人工智能应用研究

随着我国科学的进步和时代的发展,计算机网络技术的应用是大势所趋,通过计算机网络发展中技术的应用。当新时期科学技术应用到计算机网络技术发展中、大数据技术和人工智能中等,这就是计算机网络技术融合形成的一种新型技术,通过这种新型技术和我们的网络安全技术相结合,可以满足未来计算机网络技术发展的需要。该文将对计算机网络技术、数据时代人工智能应用进行分析和研究,为人工智能在计算机领域中提供一些相应的帮助和参考。     

赛博科学观下的情境化知识

西方科技文化发展至今，赛博科学观成为重要的文化思潮之一。赛博反映了当代人类身体受到现代生物和信息技术的深远影响。赛博科学观的形成顺应科技哲学后实证主义实践转向的趋势，从哲学层面上来看，赛博的出现意味着打破传统的二元论观点，同时意味着一种各异质性要素相互糅合的赛博新本体，与赛博科学观相契合的情境化知识理论强调不同声音、不同视角之间的相互碰撞和交流，为科学客观性的解读提供了一个全新视角。     

全国高校计算机考试机试评分系统方案设计

随着计算机的日益普及、信息技术和计算机网络的迅速发展,利用信息技术和网络技术实现计算机无纸化、自动化考试势在必行.本文阐述了全国高校计算机等级考试一级机试考试评分系统的方案设计和实施过程方案.     

XML技术的跨数据库文献检索

随着计算机和网络技术的不断发展,电子资源类文献资料日益丰富,通过XML技术的跨数据库文献检索系统成为目前信息化建设中一个重要的课题.本文综述了XML技术在跨数据库文献检索中的应用.     

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…     

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.     

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.