中山大学学报(自然科学版)卷期一览表

本刊从1955年创刊至今,从未分卷,且两次中断,为了便于检索,从1989年起,以1年为1卷,顺序编排卷号,在此以前均为虚拟卷号。落总期备注1 年19751976197719781979198019811982198319841985198619871988期总期备注1一41一41一41一41一41一41一41一4l一41一41一41一41一41一4新6一9新     

铁钉、战马与王朝

在英国民间流传着这样一首歌谣：缺了一枚铁钉,掉了一只马掌;掉了一只马掌,失去一匹战马;失去一匹战马,损了一位骑兵;损了一位骑兵,丢了一次战斗;丢了一次战斗,输掉一场战役;输掉一场战役,毁了一个王朝。     

费尔马大定理摘零

定理1设。)1,当:,y,:适合不定方程扩+犷一扩,:>O,鱿>O,:>0时,则 名=max(x,夕,之). 定理2若n)2,且:任N(N表示自然数),:一l,;一l,则方程 扩+犷一扩,夕>0,无整数解. 证因,>0,:>1,故:一1时,由(l)可得 ;一澎护一l,。)2(1),一1一〔(一l)+,:一l一玄(”)(:一l)卜,一1卜l几~艺(.)(z一‘)一’一(:一,)·十艺(”)(:一,)一因,二)2,:>,,故玄(”)(一1)一、。,则广一、>(一,): ‘,1云 (算术根)沙呀二万>:一1(。)2,:>l) 又因扩一1<广, 故了分一l<名(二)2,公>l). 由(2),(3)得 :一1<澎扩一1<;(。)2,:>1). 由(1),(4)得 :一1<鱿<;(:为大于l的整数). 显然夕不能…     

北方之海——阿那亚的海岸,心之所在

正大海不仅仅是一种景观式存在,更是一种情怀,一种生命样式,一种心灵状态,一种精神属性,一种生活方式。远离烦嚣,就是最美的时光。     

关于两个组合恒等式

入bcl值等式【’X一‘二+,+二)一艺(又)‘X、‘·)二一(、。一(,卜一‘)·。(1)Cauehy公式“J艺(又)‘X+“,““十”一‘’一艺(,,、‘二礴,一}一”’(2)(l)的证明:由文〔1〕知只须证明X一(一l一,十·,一乏(;)(X+介)一(,卜一‘)一(3)0‘圣‘。‘己‘3,的右边为“,,,则‘(;,一。里。(:)(·+,卜‘,一:‘,干左’设O镇l成n一1,则,了!)(,卜艺(、)!须又二{礴‘·+一‘,’、一’一““+‘,‘-_孟若n几~‘k艺(·)‘粉’‘厂‘退(·+一‘一“,一‘一“,+‘十‘”“’,孟尸n一乙故f‘,(一x一n)一(n)‘乏 O次夕,军n,乙(一l)、,(”于‘)‘·+·:‘一…     

藏兽医验方、单方和偏方选

一、家畜传染病防治方剂 (一)牛羊口蹄疫 1.沙柳枝叶一斤,常水十五斤煎汤内服,每次一藏碗,连用五～七天。(日服一次) 2.水柏枝一斤,常水十五斤煎汤内服,日服一次,每次一藏碗,连用五～七天。 3.翼首花全草一斤,常水十五斤煎汤内服,日服一次,每次一藏碗,连用五～七天。 (以上诸方均可用于犊牛口蹄疫的预防和治疗)     

幸福是什么

有时候,一个简单的微笑,是一种鼓舞,也是一种亲切的问候。 有时候,一个简单的问候,是一种礼貌,也是一种真诚的关心。     

5″—核苷酸生产工艺

一母一一酵一浓盐抽提;10%工业食盐,托0℃,二小时…儿丫桔青霉一 】 伞一核酸提取液…pH=2.弓,沉淀核酸 C O 4….击丫斜。、培养基… {“8℃一30oC,48小时余,面菌种…{接种入三角瓶一三角瓶培养J_核糖核酸一 72小时2习℃一30oC棉床培养—、}.纱布上滤…—滤液为弓’一磷酸二醋酶一…稼}10%磷酸二醋酶液酶介,“。C一70℃,二小时0.弓一1%核糖核酸四种5混一核昔酸合液真空浓缩,700C,PH=6一7杏浓缩掖为原体积 十分之一 幸 5’一核昔酸浓缩液装瓶,高压杀菌(1公斤压力,1,分钟 伞 供农业大田试用 一 一l"一 一 一 一加入三倍体积工业酒精沉淀l…     

和式■及■的计算

引理1设l>1整数,若l一2nl,则田~l 1产、夏、,、,,,八、,。。、、八z少COS‘以~一一下~,万下一I夕七:e0s气l一乙r少皿十t勺丁I 乙一’、,一沪户丫.0成立。若l一Zm+1,则‘AZ)。0 Sla一子二艺C:一(‘一2·,。“0成立,若l二Zm,则(A3)5 in’q=班艺孟〔艺(一1)乃一C:一(‘一Zr〕·+告C;〕r .0成立,若l~Zm号(A‘1,则5 in’a= 12’一l艺‘一1,’‘c/s‘n“一“r’“成立。 证明由三角函数指数定义c。s。一、(一+一及51·。一誉i(··」一当l~Zm J·。5 la一:、(二+一)三1一借二艺C了·‘,目O士e艺+C少旦卜加、,、一e一(l一z‘)“‘ 2于,二+…     

来自大自然的环保数字

一亩树林的作用一亩树林,每天能吸收 67千克二氧化碳,释放49 千克氧气,足够65个人呼吸之用。一亩树林,一个月可吸收二氧化硫4千克,相当于一台杀菌剂制造机。一亩树林,一年可吸收灰尘22吨至60吨,它是一台天然的吸尘器。     

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.