共查询到19条相似文献，搜索用时 78 毫秒
1.
APPLICATION OF CLAYS TO REMOVAL OF RED TIDE ORGANISMS Ⅲ.THE COAGULATION OF KAOLIN ON RED TIDE ORGANISMS 总被引：18，自引：2，他引：18
This article reports studies on the coagulation of kaolin(from Wuxian,Jiangsu,China)on various red tide organisms,and the observation for the first time that the coagulation of kaolin is much greaterthan that of montmorillonite so that kaolin is a more effective clay for removing red tide organisms.The authors’theoretical explanation and analysis by a mathematical-physical model prove that comparedto montmorillonite,kaolin has greater attraction for organism cells and therefore greater coagulation capabil-ity.This project’s studies on the effects of pH and acid-treatment show that the acid-treatment does not have much influence on the kaolin system;whereas the effect of pH on the kaolin system is the same asthat on the montmonrillonite system. 相似文献
2.
A component (s-factor) with obvious promoting effect on hydrogen evolution of hydrogenase has beenisolated and extracted from a Cell=free preparation of Spirulina platensis.The effect of the s-factor in the re-action system is similar to that of Na_2S_2O_4, but is coupled with ligh. The s-factor has the maximumabsorption peak at 620 nm in the oxidized state, at 590 nm in the reduced state. The partially purifieds-factor showed two bands by SDS-PAGE and is distinctly different from phycocyanin,which has nochange of oxidized state and reduced state absorption spectra, and also has no promoting effect onhydrogenase of Spirulina platensis under the light. 相似文献
3.
HUWei-ping ZHUYin-zhong 《中国地理科学(英文版)》2003,13(1):48-55
From the ecological viewpoint this paper discusses the urban spatial-temporal relationship.We take regional towns and cities as a complex man-land system of urban eco-community,This complex man-land system comprises two elements of “man“ and “land“,Here,“man“ means organization with self-determined consciousness,and “land“ means the physical environment (niche ) that “man “depends on .The complex man-land system has three basic components,They are individual,population and community,Therefore there are six types of spatial relationship for the complex man-land system.They are individual,population,community,man-man,land-land and man-land spatial realtionships,Taking the Pearl(Zhujiang) River Delta as a case study,the authors found some evidence of the urban spatial relationship from the remote sensing data,Firstly,the concentration and diffusion of the cities spatial relationship was found in the remote sensing imagery,Most of the cities concentrate in the core area of the Pearl River Delta ,but the diffusion situation is also significant ,Secondly,the growth behavior and succession behavior of the urban spatial relationship was found in the remote sensing images comparison with different temporal data ,Thirdly,the inheritance,break ,or meeting emergency behavior was observed from the remoted sensing data.Fourthly,the authors found many cases of symbiosis and competi-tion in the remote sensing data of the Pearl River Delta ,Fifthly,The autoeciousness,stranglehold and invasion behavior of the urban spatial relationship was discovered from the remote sensing data. 相似文献
4.
NEW METHOD TO OBTAIN THE POWER SPECTRA OF HIDDEN VARIABLES AND ITS APPLICATION TO OCEAN DATA 总被引：2，自引：0，他引：2
A novel method is proposed to obtain the power spectra of hidden variables in a chaotic time series. By embedding the data in phase space , and recording the conditional probability densityof points that the trajectory encounters as it evolves in the reconstructed phase space, it is possible torecover the power spectra of hidden variables in chaotic time series through a spectral analysis over theconditional probability density time series. The method is robust in the application to Lorenz system, 4-di-mension Rossler system and rigid body motion by linear feedback system (LFRBM). Applying the method the time series of sea surface temperature (SST) of the South China Sea, we obtained the power spectraof the wind speed (WS) from SST data. Furthermore, the results showged that there exists an importantnonlinear interaction between the SST and the WS. 相似文献
5.
6.
John D. Wang 《中国海洋湖沼学报》1985,(2)
The effects of tides, wind and river discharges on the flow patterns in Bohai Sea are investigated. The Finite Element Method is used to cast the vertically integrated, long wave equations into a system of nonlinear ordinary equations in time. For simplicity we adopted linear triangular elements which are easily integrated exactly and lead to matrices of relatively small bandwidth. The system of ordinary differential equations is solved using a simple finite difference scheme.Because of the small contribution from three partial tides S2, K1 and O1, we take only the M2 tide into account. In this study the computations show Liaodong Bay in the north to be the locale of both the maximum flood and ebb strengths; tidal currents in Laizhou Bay in the south are of less importance in the tidal circulation of Bohai Sea. The discharges of four major rivers and wind speed of 7.0 m/s blowing from the north are used for examining the change in the M2 tidal current field. The simulations show that the influence of wi 相似文献
7.
蒋忠信 《中国地理科学(英文版)》1993,3(4):308-325
With the methods of regression analysis and trend surface analysis, taking the bottom and top lines of dark conifer forest, bottom line of permafrost and the snowline of the latest glaciation in China as examples, this paper discusses the zonality regulaties of the distribution of physico-geographical zones in China. (1) Latitude zonality obeys the mathematical model of normal frequency distribution, being approximate to descending straightly within the latitude of China. (2) Longitude zonality shows that the elevation of physico-geographical zone rises straightly with the distance to east coast. (3) The combination of latitude and longitude zonalities appears a plane inclining from SSW to NNE. The decline of physico-geographical zone resembles a semiellipse- sphere inclining from the Qinghai-Xizang (Tibet) Plateau to northeast China, reflecting the effect of relief. (5) Physico-geographical zonation depends on the combination of hydrothermal conditions. Thus the factors influencing the distribution reg 相似文献
8.
SHIChun PhilipJAMES GUOZhong-yang 《中国地理科学(英文版)》2004,14(1):1-8
Meeting the challenge of sustainable development requires substantial advances in understanding the interaction of natural and human systems. The dynamics of regional sustainable development could be addressed in the context of complex system thinking. Three features of complex systems are that they are uncertain, non-linear and self-organizing. Modeling regional development requires a consideration of these features. This paper discusses the feasibility of using the artificial neural networt(ANN) to establish an adjustment prediction model for the complex systems of sustainable development (CSSD). Shanghai Municipality was selected as the research area to set up the model, from which reliable prediction data were produced in order to help regional development planning. A new approach, which could help to manage regional sustainable development, is then explored. 相似文献
9.
GSH system plays a role in the control of the redox balance state,anti-oxidation and protecting life from injury of ROS(reactive oxygen species).In present paper,the possible GSH system of Chlamydomonas sp.ICE-L has been investigated by evaluating GSH and GSH-related enzymatic responses at different temperatures using spectrophotometer methods.The results showed that the GSH system is correlated positively to low temperature,and other factors but GR are correlated negatively to high temperature.So GSH and GSH-related enzymes play an important role in the adaptation of Antarctic ice microalgae to low temperature. 相似文献
10.
A new technique designed to help quantify the degree of damage to the landscape from one area to another shows a close relationship between population density and the degree of landscape damage. The technique establishes a scale of damage from 0 to 5 (zero = no damage; 5 = severe damage) using data from aerial photographs, land-use maps, and field data. The related formula allows one to compare the relative degree of damage across regions using a combination of an absolute index, a theoretical index, a relative index, and population density. Xing'an County is used to demonstrate the technique. 相似文献
11.
任美锷 《地球信息科学学报》2004,6(1):1-3
论述了地理科学系统理论与过去地理学的人地关系理论之间的差异,其不同点:(1)地理科学系统强调人与地之间的相互影响;(2)地理科学系统指出研究范围包括过去、现在和将来;(3)地理科学系统理论既适用于某一国家、地区,也适用于研究全球变化。同时论及了其在现代经济建设中的意义。 相似文献
12.
Human beings have had a tremendous impact on natural ecosystems and are now the principal power to change the biosphere.It is logical that we should pay close attention to the interaction between human systems and environ-mental systems.Taking Minqin bsin ,Gansu Province,as a case,this paper focuses on the evolution of regional physic-cal environments and the cultural systems by which people maintain their relationships with those environments.This pa-per presents the conceptural framework for the man-land system.Expecting to accelerate the regional sustainable develop-ment,it also analyses the evolutionary mechanism of regional man-land system.On the basis of reviewing and analyzing the evolution of man-land system in Minqin basin,the paper also brings forward an adujusting mode for the studied area, which consists of three aspects:to build up a concept that economic growth must harmonize with environmental qualityˊs and land productivityˊs improvement;to make a whole planning and management in the drainage area;and to push for-ward the technique of water-saving irrigation and establish water-saving agricultural system. Itˊs meaningful for resource exploitation and sustainable development of Chinese northwestern arid area,which is represented by Minqin basin,by under-standing what great changes the basin has experienced is experiencing at the global background,and studying its time standing what great changes the basin has experienced and is experiencing at the global background,and studying its time order and territorial structure ,the systemˊs character and law of evolution,trend and the regulating ways to improve man-land relationship. 相似文献
13.
地学信息图谱方法研究的框架 总被引：7，自引：3，他引：4
本文对地学信息图谱方法从地理学的角度提出了概念性的框架 ,认为图谱研究不仅仅局限于表现 ,而且更重要的是一种分析方法。地学信息图谱是图形、方法和认知三者的综合与统一。讨论了对地学信息图谱概念的认识。然后从中国古代的风水理论和地图学 ,以及物理学和生物学方面分析了人类在使用图谱方法上的借鉴意义 ,最后从哲学、理论和技术的层面上分析和论述了地理学存在的问题 ,指出将分析与综合紧密结合在一起的整体综合思想 ,是地学信息图谱方法的哲学基础。地学信息图谱的内容将是联结地理学传统理论和地理信息系统之间的“纽带”。作为地学信息图谱研究的起步工作 ,地理学在区域地理单元及其等级体系 ;主要地理要素的遥感影像特征分析 ;地学信息图谱的表达方法三方面的进展将会使地学信息图谱的研究获得更清晰的思路。 相似文献
14.
交通大数据在人文与经济地理学的应用及学科影响 总被引：2，自引：0，他引：2
交通大数据能够反映人类社会经济活动产生的位移与时空轨迹,不仅能够满足学者们在微观尺度更深入、更精细的研究粒度要求,而且能够为宏观尺度的研究提供广范围、多视角的连续性观测,其研究与发展为人文与经济地理学带来了新思路和新技术。本文以交通大数据的研究前沿为基础,梳理了区位论、时空行为、复杂网络、流空间等理论研究的发展方向,勾勒了“大数据时代”背景下人文与经济地理学的研究框架体系,探讨了新旧技术方法融合的可能性,并讨论了对各个分支学科相关研究的影响。接着,本文总结了交通大数据在人文与经济地理学的主要应用方向与趋势,主要包括出行即服务的交通规划理论与方法,“人工智能+大数据”的城市管理科学,大尺度交通流迁移的模拟,以及“流空间”与“场所空间”的多维度研究等。最后,本文指出了交通大数据应用在获取难度和数据有偏性等方面值得注意的问题并进行了展望。 相似文献
15.
统计物理学用熵来表示分子不规则运动的程度,信息论中则用它来度量信息量,即一个系统越是有序,信息熵就越低。在对浙江省全省城镇土地调查数据汇总统计的基础上,运用信息熵的概念对复杂的城市土地利用结构进行详细的定量分析,用信息熵和均衡度值来说明城市土地利用的特点,利用方式的多样性和复杂性,并提出提高土地利用效益的工作建议。 相似文献
16.
地球信息科学的理解与实践 总被引：11，自引：3，他引：8
地球信息科学的研究对象是人类智慧圈;其任务是以信息流调控人流、物流和能量流的人地关系,服务于和平与发展。同时论述了地球信息科学的理论与方法,以实例作了深刻分析,并提出用地学信息图谱的方法认识自然、掌握自然规律,反演过去、预测未来的观点。最后呼吁GIS领域应尽快引进格网计算技术,推动地球信息科学发展。 相似文献
17.
Geography and Rural Household Income： A Village Level Study in Henan Province, China 总被引：2，自引：0，他引：2
This study uses the data from a sample survey conducted in April 2007 on 1 251 rural households in 11 villages of Henan Province, the largest less developed agricultural province in China, to examine how geography affects rural household income (RHI). The quantitative analysis indicates following results. 1) The significance of the traditional geographical factors reduces as RHI rank increases. 2) The landform does not affect the RHI significantly. The per capita income of rural household in a plain area is lower than that in a mountainous area. And 3) the capital endowment and status of non-farm economic activities contribute to the increase of RHI. But the probability and intensity of non-farm economic activities of rural households in urban outskirts villages are higher than that in non-urban outskirts villages. Based on the results, the paper further concludes that geography still plays a significant role in rural development, but it is changing over time. The agricultural resources (such as per capita arable land) significantly affect RHI with the relatively lower income level, while the geographical location shows a more significant impact on RHI with the relatively high income level. Along with economic development, the proximity replaces the traditional geographical factors such as landform and physical resources as the major determining factor in RHI. 相似文献
18.
李爽 《地球信息科学学报》2004,6(4):15-18
从地球系统科学和地理科学研究内容与研究手段的角度出发,探讨数字地球对人地关系研究的影响,在新技术框架下,地球系统科学所研究的新人地关系,成为实现可计算的人地关系的现代地理学发展关键阶段所必需的理论与技术依托。研究认为在数字地球实验室框架下,可以实现为地理科学的原始性创新提供虚拟创新环境。地理科学虚拟创新环境以不同空间、时间分辨率的数据为基础,或以物质和能量的多种分辨率的有关资源、环境、社会、经济和人口等海量数据或信息进行数据融合后产生的数据,按照一定的地理坐标,从里层到外层,从岩石圈到生物圈、大气圈,从局部到整体,从区域到全球进行整合、融合及多维(如4维)动态模拟,从而为解决地理科学这个复杂巨系统现状描述、历史反演、未来预测研究提供知识创新的平台、技术开发与理论研究的实验基地。 相似文献
19.
Based on Hagget's theory of spatial structure,researches on the nodes and field of tourist origins to Huang-cheng Village in Shanxi Province of China have been explored.Nodal hierarchy structure of tourist origins is analyzed with cluster analysis and the gravity model.And field of tourist origins is analyzed with attraction radius index(R)and geography concentration index(G).In the field analysis,R and G of Huangcheng Village are compared with Xidi Village that is a world heritage located in Huangshan City of Anhui Province in China.According to comparison of loca-tions of two areas,influential factors for field area of Huangcheng Village are identified.It is concluded that:1)cluster analysis and gravity model can be complementary methods to each other for nodal hierarchy structure analysis of tour-ist origins;and 2)as far as location is concerned,the weak intensity effect of tourism resources in the tourist region is a major cause for explaining why tourist origins to Huangcheng Village are mainly its neighboring areas.Moreover,it is suggested that the regional effect of tourist resources should be regarded as a component of destination attractiveness when applying gravity model. 相似文献