共查询到20条相似文献，搜索用时 46 毫秒
1.
陈子林 《大地测量与地球动力学》1994,(2)
简述了耗散系统的自组织演化过程中（特别是临界行为中）Ｌｙａｐｕｎｏｖ指数的变化规律，介绍了Ｌｙａｐｕｎｏｖ指数的定义、理论背景与计算和估计方法，用数值方法计算了Ｒｏｓｓ１ｅｒ吸引子与Ｌｏｒｅｎｚ吸引子的正指数，并以大灰厂水准资料和京津唐地区多台资料为例，计算了蕴震系统在大震前后其正Ｌｙａｐｕｎｏｖ指数值的变化，以此来分析和研究系统的临界行为及其自组织的演化过程，以期为地震预报提供一种实用化的参数。 相似文献
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点簇(即点的集合)具有特定的组织结构;沟谷作为一类自成体系的重要空间实体,表达其形态、结构、发育等关键属性特征的沟谷特征点簇,是有严密的组织结构、密切的空间关系和完整的属性描述的关键特征点的集合。建立沟谷特征点簇的空间结构模型,进行沟谷特征的空间分析与应用,具有重要的科学意义。本文在分析沟谷特征点簇的组成要素、空间与结构特征的基础上,确定了点簇的层次结构模型和非结构化文件存储方式,编程实现了沟谷特征点簇数据模型;然后,构建了点簇文件,并运用C# + AE的开发方式,研发建立了基于点簇的沟谷分析原型系统,实现了沟谷特征点簇数据的可视化、结构空间分析、专题属性特征分析等基本功能;最后,以特征点的沟谷路径追溯查找效率作了对比分析,验证了基于特征点簇模型的沟谷分析具有较高的处理效率。本研究构建的面向沟谷特征点簇的空间结构模型,研发的具有沟谷结构、形态与属性分析功能的沟谷分析原型系统,有一定的应用价值。 相似文献
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分析了耗散结构理论要点,从耗散结构形成和保持的条件入手对断裂活动特点、状态、成矿过程进行了分析。指出了断裂带是地壳内部各种差异最为集中,最为活跃,最经常起作用的地带,并可处于远离平衡的开放状态。而且又经常处于内、外部涨落的影响之下。因此在断裂体系内部可通过某种非线性相干效应而自发产生某种自组织现象即耗散结构。同时运用耗散结构理论对成矿作用进行了分析,指出了成矿作用实质上是成矿元素的一种自组织现象,矿体实质上是一种耗散结构,这样就使断裂作用与成矿过程有机地联系起来。最后,运用耗散结构理论和断裂成矿理论对我国内生金矿的特征进行分析,进一步指出了耗散结构理论在断裂成矿作用理论上的意义。 相似文献
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国内流域产汇流模型与应用分析 总被引：1，自引：0，他引：1
本文对国内流域产汇流研究与应用进行了分析、比较和综述。重点是对流域产流模型结构建立的理论基础分析,流域汇流的单位线方法和流域的实际物理特性和水流运动的内部机制之间的对应关系的分析。流域产汇流模型和遥感技术相结合应用到具体工程实践所产生的新的理论技术和研究方向作了分析。最后应用系统论、控制论和反问题对上述问题进行了系统的归纳和总结。 相似文献
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地球信息科学基础理论纲要(下) 总被引：4，自引：0，他引：4
承继成 《地球信息科学学报》1997,(3):27-29
地理系统熵原理 熵(Entropy)是描述复杂系统状态的物质量,也是耗散结构理论和信息论的一个核心概念。熵是指事物的无序度或不规则性的一种度量,它的应用范围不仅涉及物理、化学、生物学、信息科学及地理科学,而且已渗透到社会学、经济学及其它许多科学领域。熵这一术语起源于经典热力学,最早是由R.Clausius在热机效率研究中提出来的,是耗散结构理论的核心,后来成为能量状态函数和信息量的函数。 相似文献
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资源环境模型库系统集成分析 总被引：9，自引：3，他引：6
基于国内外计算机与系统工程领域的模型库系统建设理论和技术,在对资源环境模型进行汇集、修正、分类的基础上,结合资源环境模型的综合性与复杂性特点,对模型库系统研究进行理论分析,并对资源环境模型库系统通用平台进行总体设计与研发,是高效地利用已有的知识和模型、开发必要模型的前提条件,是研究各种重大资源环境问题的关键性技术手段与支撑平台。论文在对模型库系统理论技术及其应用的研究进展进行阐述的基础上,提出了资源环境模型库系统通用平台的总体框架,并对资源环境模型库系统核心组成部分的功能结构进行了设计。 相似文献
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基于XML-RPC的分布式地理信息系统计算模型 总被引：4，自引：1，他引：3
分布式异构GIS系统集成与互操作是GIS应用发展的趋势和方向。本文在WMS和GML研究基础上,提出了一种基于XML-RPC的分布式GIS计算模型,设计了分布式GIS应用操作与数据的XML抽象与表达,并进行了原型系统的实现研究。 相似文献
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西安地区单桩桩土相互作用数值模拟分析 总被引：1，自引：0，他引：1
随着计算机技术和数值方法的不断发展和完善，使有限元法得到越来越多的应用。根据西安地区原型摩擦桩的地层特点和土性条件，运用有限元基础理论，利用相应的边界条件与假设条件，建立单桩数学模型。通过模型研究了单桩的沉降特性与土共同作用的影响因素，对西安地区单桩桩土相互作用机理进行了探讨。 相似文献
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数据组织模型是对科学数据进行有效管理、共享与应用的基础。日地空间物理学科通常采用基于语义标注的传统数据组织模型,但是该模型忽略了数据间的时空关系,难以支持大规模数据处理与关联分析,应建立一种支持时空计算的数据组织模型,从而有效支持当前日地空间物理领域对数据快速发现、精细结构识别、耦合关系研究与时空演化分析等方面的应用需求。鉴于此,本文提出了HTM-ST离散化时空数据组织模型,该模型在层次三角网格的基础上,在时间维度通过等长剖分进行扩展,从而形成离散化的时空剖分,采用时-空耦合编码将高维的剖分单元组织到一维空间中,并基于上述剖分结构与编码算法在HBase环境下设计了模型的存储方案。本文利用多颗极轨卫星的能量粒子探测数据实现了该数据组织模型的原型示范系统,并设计了基于该模型的时空查询算法和地方时全球数据插值算法,用于对该模型进行实验验证。实验分析表明,HTM-ST模型具有高效性和鲁棒性,可以作为面向时空关系的日地空间物理数据组织与存储基础。 相似文献
10.
从实时数据计算与地理过程模型集成的角度出发,针对流计算模型、系统耦合架构等难点,提出了基于开放标准的传感网与流计算耦合架构、实时内涝信息流计算模型等方法,设计并实现了一种基于流计算的城市内涝模型实时感知原型系统,并通过案例实验结果与分析,验证了方法的可行性。 相似文献
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The ability of cell to modulate the fluidity of plasma membrane was crucial to the survival of microorganism at low temperature. Plasma membrane proteins, fatty acids and carotenoids profiles of Antarctic psychrophilc yeast Rhodotorula sp. NJ298 were investigated at -3 ℃, 0 ℃ and 8 ℃. The results showed that plasma membrane protein content was greater at -3 ℃ than that at 8 ℃, and a unique membrane polypeptide composition with an apparent molecular mass of 94.7 kDa was newly synthesized with SDS-PAGE analysis; GC analysis showed that the main changes of fatty acids were the percentage of unsaturated fatty acids (C18∶ 1 and C18∶ 2) and shorter chain saturated fatty acid (C10∶ 0) increased along with the decrease of the culture temperature from 8 ℃ to -3 ℃; HPLC analysis indicated that astaxanthin was the major functional carotenoids of the plasma membrane, percentage of which increased from 54.6±1.5% at 8 ℃ to 81.9±2.1% at -3 ℃. However the fluidity of plasma membrane which was determined by measuring fluorescence anisotropy was similar at -3 ℃, 0 ℃ and 8 ℃. Hence these changes in plasma membrane's characteristics were involved in the cellular cold-adaptation by which NJ298 could maintain normal plasma membrane fluidity at near-freezing temperature. 相似文献
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《极地研究(英文版)》2014,(4)
正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprehensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose 相似文献
14.
《中国海洋大学学报(英文版)》2014,(4)
<正>Copyright Submfnion of a roanusatpt inks:that the work described has not been published before(exoept In the form of an abstrW or as part of a published lecture,review,or thesis);that it is not under consideration for publication elsewhere that its publication has been approved by ail 相似文献
15.
《中国海洋大学学报(英文版)》2014,(6)
<正>The Journal of Ocean University of China(Oceanic and Coastal Sea Research)is a comprehensive academic quarterly sponsored by the Ocean University of China,published one volume per year.This journal is devoted to the publication of the theoretical and applied research results on oceanography and marine fisheries.The fieldcovered include the physical,chemical,biological,geo- 相似文献
16.
Massimo GRECO 《山地科学学报》2014,(6):1383-1384
<正>The 35th IAHR World Congress was held in Chengdu,China from September 8 to September 132013.The title of the conference was:"The Wise Finds Pleasure in Water:Meandering through Water Science and Engineering".During the congress,1239 papers were presented in 139sessions for oral presentations and 7 sessions for poster presentations.After the Congress,a Committee was appointed to select some of the best papers presented at the Congress for publication,after a 相似文献
17.
As an important component of the cryosphere,sea ice is very sensitive to the climate change.The study of the sea ice physics needs accurate sea ice thickness.This paper presents an electromagnetic-induction(EM) technique which can be used to measure the sea ice thickness distribution efficiently,and the successful application in Bothnian Bay.Based on the electromagnetic field theory and the electrical properties of sea ice and seawater,EM technique can detect the distance between the instrument and the ice/water interface accurately,than the sea ice thickness is obtained.Contrastive analysis of the apparent conductivity data obtained by EM and the value of drill-hole at same positions allows a construction of a transformable formula of the apparent conductivity to sea ice thickness.The verification of the sea ice thickness calculated by this formula indicates that EM technique is able to get reliable sea ice thickness with average relative error of only 12%.The statistic of all ice thickness profiles shows that the level ice distribution in Bothnian Bay was 0.4-0.6 m. 相似文献
18.
Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area. 相似文献
19.
正Rapid changes of Arctic sea ice cover have been in the focus of the international climate research community in recent years.Quite a few of nations have completed a large number of related surveys and research projects in the Arctic Ocean.Up to now,China has performed six research cruises to the Arctic Ocean resulting in a significant volume of research output.Improved knowledge on the atmospheree-sea ice-ocean interactions in the Arctic is a 相似文献
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