区域经济地理学理论方法建设简论   总被引：11，自引：0，他引：11  

徐效坡 《云南地理环境研究》1990,2(1):14-20

长期以来,中国区域经济地理学基本上是沿着就空间论空间,就经济论经济,就布局论布局的道路走过来的。10年改革,使学科获得了显著发展。今后的任务似应在实践基础上进一步加强理论方法建设。在理论上,把就空间论空间的区域观念转变为时空统一的区域观念;在内容上,从就经济论经济,就布局论布局扩展到以经济为主体,以自然和社会为两翼的广泛领域;在方法上,从分析——综合转变为全方位(综合——分析——综合)的综合。同时,加强指标体系的建设;重视对区域本质特征、即区域个性的研究,通过把握区域运动的主要矛盾,促进其合乎规律地发展.  相似文献   

A DWT Power Spectrum Analysis of PSCz Galaxies     

Yiao－HuYang  Long－LongFeng 《中国天文和天体物理学报》2001,1(3):200-212

The power spectrum estimator based on the Discrete Wavelet Transformation (DWT) is applied to detect the clustering power in the IRAS Point Source Catalog Redshift Survey(PSCz). Comparison with mock samples extracted from N-body simulation shows that the DWT power spectrum estimator could provide a robust measurement of banded fluctuation power over a range of wavenumbers 0.1-2.0h Mpc^-1. We have fitted three typical CDM models (SCDM, TCDM and ACDM) using the Peacock-Dodds formula including non-linear evolution and redshift distortion. We find that, our results are in good agreement with other statistical measurements of the PSCz.  相似文献   

Orbit Determination Using Satellite—to—Satellite Tracking Data   总被引：3，自引：0，他引：3  

Ying－ChunLiu LinLiu 《中国天文和天体物理学报》2001,1(3):281-286

1 INTRODUCTIONThe tracking arc-length should be increased in order to approve the accuracy in orbitdetermination of LEO (Low Earth Orbit) satellites. The local ground-based tracking networkdoes not provide sufficient orbit coverage for the user satellites. The most promising methodis to use high orbiting satellites, such as GPS and TDRS, as trackers to observe the usersatellites. For examPle, tWO geosynclironous satellites could cover more than 85% of the orbitof any given user sate…  相似文献   

Ballast water sampling as a critical component of biological invasions risk management   总被引：8，自引：0，他引：8  

David M  Perkovic M 《Marine pollution bulletin》2004,49(4):313-318

The human mediated transfer of harmful organisms via shipping, specifically via ballast water transport, leading to the loss of biodiversity, alteration of ecosystems, negative impacts on human health and in some regions economic loss, has raised considerable attention especially in the last decade. Ballast water sampling is very important for biological invasions risk management. The complexity of ballast water sampling is a result of both the variety of organism diversity and behaviour, as well as ship design including availability of ballast water sampling points. Furthermore, ballast water sampling methodology is influenced by the objectives of the sampling study. In the course of research conducted in Slovenia, new sampling equipment for ships' ballast water was developed and tested. In this paper new ballast water sampling methods and equipment together with practical shipboard testing results are presented.  相似文献   

遥感图像大气校正的黑暗像元法   总被引：13，自引：1，他引：13  

郑伟  曾志远 《国土资源遥感》2005,16(1):8-11

介绍黑暗像元法大气校正的思路，阐述了不同黑暗像元法的大气校正模型，选择其中2种模型对一景SPOT图像进行了大气校正 ，最后指出了黑暗像元法需要进一步改进的地方。  相似文献   

测定水中硫酸根方法的概述   总被引：16，自引：1，他引：16  

宋金如  刘淑娟  朱霞萍 《华东地质学院学报》2002,25(2):154-158

介绍了测定水中硫酸根的方法和几种常用方法在水质分析中的应用。  相似文献   

波动方程地震偏移成像方法的现状与进展   总被引：15，自引：19，他引：15  

刘喜武  刘洪 《地球物理学进展》2002,17(4):582-591

综述了波动方程地震偏移成像方法研究的现状，指出了各种算法的问题和解决方案；给出了相空间小波分析步进算法偏移成像以及保幅保结构李群算法偏移成像的最新进展；对波动方程偏移成像发展趋势进行展望。  相似文献   

Anwendung von biologischen Testverfahren an Abwässern der Textilindustrie     

I. Jger  St. Gartiser  R. Willmund 《洁净——土壤、空气、水》1996,24(1):22-30

Testing Effluents of the Textile Refining Industry with Biological Methods The environmental problems caused by the manufacture of finished textiles involve a long chain of individual processes. This “textile chain” includes very diverse enterprises of varied size and structure. The textile refiners occupy a key position in the “textile chain”. On the one hand, this is due to their use of an obscurely large number of chemicals which can end up in the wastewater as well as in the textile products. On the other hand, this key role of the textile refining industry is based on their central position between the preproduction stage and the consumers. This study dealt with the textile refining industry's wastewater. As measured by volume and contents of its wastewater, this industry can be counted among the major industrial plants which discharge into municipal wastewater treatment plants. German wastewater legislation includes the provision that substances which are toxic, persistent, capable of accumulating, carcinogenic, fetotoxic or mutagenic be kept out of natural waters as well as technically possible (Wasserhaushaltsgesetz WHG). Several biotest methods for examining the effect of the substances contained in the wastewater were incorporated into the appendix of the German wastewater regulation (Rahmenabwasser-Verwaltungsvorschrift based on § 7a WHG). The aim of this study was to show, with the aid of biotest methods, how strongly the wastewater of textile refining companies is polluted as compared to other known industrial branches and to what degree the pollution of these wastewaters is eliminated by the treatment in wastewater treatment plants. Finally, we experimented to find out which biotest methods were suited for the examination of these wastewaters. The study's results show that the ecotoxicity of the textile refining industry's wastewater was only extraordinary high in isolated cases as compared to other examined branches of industry. The textile wastewaters exhibit values of G_L = 3 to G_L = 96 in the luminescent bacteria test, G_D = 1 to G_D = 192 (with one exception of G_D > 30000) in the daphnia test and G_F < = 2 to G_F = 32 in the fish test. It turned out though, that a large number of the samples from the textile refining companies (27%) reacted mutagenically in the Ames test in their native state. Consecutive tests for chromosomal aberrations (V79 hamster cell test) also showed mutagenic potential in five out of nine native samples. The employed testing methods with fish, daphnia and luminescent bacteria demonstrate a higher sensitivity of the luminescent bacteria and/or the daphnia as opposed to the fish in most cases. As the fish test is controversial anyway on the grounds of animal protection, a replacement of the fish test by these other tests should be aimed at: on account of the different end points of the luminescent bacteria and the daphnia test, a combination of these tests appears most sensible.  相似文献   

Belastung von Krankenhausabwasser mit gefährlichen Stoffen im Sinne § 7a WHG     

St. Gartiser  L. Brinker  T. Erbe  K. Kümmerer  R. Willmund 《洁净——土壤、空气、水》1996,24(2):90-97

Contamination of Hospital Wastewater with Hazardous Compounds as Defined by § 7a WHG In total, 45 samples of hospital wastewater obtained from different origins (total wastewater, nursing, and laboratories) were investigated using chemical analyses as well as biological testing methods. In parallel, the consumption of several product groups relevant to the wastewater has been calculated. The water consumption strongly influenced the quality of the corresponding wastewater. Most of the values of the chemical parameters determined were found within a range as would have been expected for municipal wastewater. The AOX concentrations were distinctly elevated (0.41 mg/L in total wastewater and 0.95 mg/L in nursing wastewater). As could be shown by the calculated consumption of different compounds, the iodoferous X-ray contrast media represented a predominant proportion of the total AOX load of the clinical wastewaters tested. The values of some of the total wastewater samples and the laboratory wastewater samples showed a high toxicity as determined using the daphnia and luminescent bacteria tests. Using Ames and hamster cell tests, 5 out of 23 samples in the clinical area and 7 out of 9 samples from the laboratories turned out to be mutagenic. The origin of this mutagenic potential could not be determined though.  相似文献   

On the reduction and presentation of data in astronomical two-channel photopolarimetry     

G. Leyshon 《Experimental Astronomy》1998,8(2):153-175

Many different methods exist for reducing data obtained when an astronomical source is studied with a two-channel polarimeter, such as a Wollaston prism system. This paper presents a rigorous method of reducing the data from raw aperture photometry, and evaluates errors both by a statistical treatment, and by propagating the measured sky noise from each frame. The reduction process performs a hypothesis test for the presence of linear polarization. The probability of there being a non-zero polarization is obtained, and the best method of obtaining the normalized Stokes Parameters is discussed. Point and interval estimates are obtained for the degree of linear polarization, which is subject to positive bias; and the polarization axis is found.  相似文献