小块体重的多元线性回归方程在锡铁山铅锌矿床储量计算中的应用   总被引：1，自引：0，他引：1  

曹春祥  李能强 《矿产与地质》2005,19(2):177-183

从锡铁山铅锌矿床小块体重样品原始测定数据入手，运用数学地质中的回归分析，建立了本矿床的小块体重多元线性回归方程，为矿床储量计算提供了科学参数。利用回归方程法计算小块体重进而可以推广到所有贱金属矿床的储量计算中。  相似文献   

社会文化地理学中小区域研究的意义   总被引：2，自引：0，他引：2  

周尚意 《世界地理研究》2007,16(4):41-46

区域分析是地理学的研究范式之一．目前大陆社会文化地理学界出现了一个小区域研究热。本文从三个部分分析了小区域研究的意义，小区域研究需要把握的方向．以及不同方法论下小区域研究的特点。在第一部分中，本文从法国人文地理学的小区域研究入手．分析了小区域与大区域之间的关系，从而指出两者之间的研究不能彼此替代。从而说明．大陆人文地理学中小区域研究增多的趋势，不是地理学家从事小区域应用项目的结果，而是学科自身发展需要。本文第二部分强调，在小区域研究中需要选择与研究问题相当的区域，同时处理好小区域与大区域之间的逻辑关系，并运用小区域研究的方法，尤其是野外的方法。本文第三部分粗略分析了经验主义、实证主义、人文主义、结构主义和后现代主义视野下的小区域研究特点。  相似文献   

Application of <Superscript>137</Superscript>Cs fingerprinting technique to interpreting sediment production records from reservoir deposits in a small catchment of the Hilly Loess Plateau,China   总被引：1，自引：0，他引：1  

Zhang XinBao  Wen ZhongMing  Feng MingYi  Yang QinKe  Zheng JinJun 《中国科学D辑(英文版)》2007,50(2):254-260

According to variations of 137Cs and clay contents, 44 flood couplets were identified in a profile of reservoir deposit with a vertical length of 28.12 m in the Yuntaishan Gully. Couplet 27 at the middle of the profile had the highest average 137Cs content of 12.65 Bq kg-1, which indicated the 1963s' deposits, then 137Cs content decreased both downward and upward in the profile. The second top and bottom couplets had average 137Cs contents of 2.15 Bq kg-1 and 0.92 Bq kg-1, respectively. By integrated analysis of reservoir construction and management history, variations of 137Cs contents over the profile, sediment yields of flood couplets and rainfall data during the period of 1958-1970, individual storms related to the flood couplets were identified. 44 floods with a total sediment yield of 2.36×104 m3 occurred and flood events in a year varied between 1 and 10 times during the period of 1960-1970. 7-10 flood events occurred during the wet period of 1961-1964 with very wet autumn, while only 1-2 events during the dry period of 1965-1969. Average annual specific sediment yield was 1.29×104 t km-2 a-1 for the Yuntaishan Gully during the period of 1960-1970, which was slightly higher than 1.11 ×104 t km-2 a-1 for the Upper Yanhe River Basin above the Ganguyi Hydrological Station and slightly lower than 1.40 ×104 t km-2 a-1 for the nearby Zhifang Gully during the same period. Annual specific sediment yields for the Yuntaishan Gully were correlated to the wet season's rainfalls well.  相似文献   

桩基动力检测技术的现状及存在的问题   总被引：3，自引：0，他引：3  

曹宇春  吴世明  高广远 《上海国土资源》2002,86(1):43-45,60

文章通过对桩基动力检测方法应用现状的简要回顾，分析了桩基高应变和低应变动测的特点和局限性。在此基础上，提出了在桩基检测和测试结果分析中注意的问题。  相似文献   

烟台海域海难事故气象条件分析及预防对策   总被引：5，自引：0，他引：5  

刘学萍 《气象》2001,27(3):55-57

通过对1990－1999年烟台辖区海域海难事故资料及烟台海区相关气象资料统计分析，得出烟台沿海及附近海域难事故发生的一般规律及其与气象的关系，并提出了海难事故的预防对策。  相似文献   

航天遥感立体测绘小卫星目标跟踪与角度测量     

李世忠  王仁礼 《测绘学院学报》2001,18(1):29-32

随着现代小卫星技术的不断发展成熟，利用该技术为地球观测服务将成为一件远景可观，意义深元的事情，文中针对舆型航天遥感立体测绘微小卫星的需求，结合单脉冲测角原理给出了航天遥感测绘小卫星地面站面线系统的整体分析与设计。  相似文献   

Quantitative models for reconstructing catchment ice-extent using physical-chemical characteristics of lake sediments     

P.E. Noon  H.J.B. Birks  V.J. Jones  J.C. Ellis-Evans 《Journal of Paleolimnology》2001,25(3):375-392

The physical characteristics of surface sediments from a suite of pristine lakes on Signy Island, maritime Antarctic, were used to develop a quantitative link between catchment ice-extent and lake-sediment response. Percentage dry weight, median particle size, percentage loss-on-ignition and wet density of the lakes' surface sediments were the most significant variables explaining contemporary catchment ice-extent. Two independent reconstruction models – Partial Least Squares (PLS) and a Modern Analog Technique (MAT) – were applied to dated sediment cores at two sites on Signy Island. The validity of the reconstructions was tested against historical information on catchment ice-extent. With sufficiently high sedimentation rates and sampling resolution, the models can predict sub-decadal changes in ice-extent. The model results are best regarded as indicators of erosion resulting from meltwater activity in the catchment. Comparison of results with Twentieth Century climate records affirms the hypothesis that climatic warming is the most likely cause for the ice retreat observed on Signy Island during the last 40 yrs. Similar reconstruction models using these simple sedimentary measures could be developed for analogous locations in the Antarctic and in Arctic and Alpine regions.  相似文献   

Conceptualising State‐Controlled Resort Islands for an Environment‐Friendly Development of Tourism: The Maldivian Experience     

Manfred Domroes 《Singapore journal of tropical geography》2001,22(2):122-137

The Maldives host a sophisticated and competitive international tourist industry which has replaced fishing as the dominant economic activity. With their rich tropical reef ecosystems and the abundant biodiversity of their marine environment, a total of 86 uninhabited islands had been converted into Resort Islands by the end of 2000. Resort Islands are equipped with comprehensive facilities for accommodation, food, recreation and leisure. They are also strictly reserved for foreign tourists and guarantee complete privacy. This gives the benefit of averting conflicts of acculturation with local islanders. In the arena of impacts on the physical environment, however, the consumptive leisure lifestyle of the tourists has been harmful to the Resort Islands as seen in sewage, garbage and waste pollution, as well as reef destruction and beach erosion. While the government of the Maldives takes great effort to harmonise tourism and the environment, the growth of mass tourism in the last 20 years has engendered grave environmental impacts. For future sustainable development of the Resort Islands, the tourists' environmental awareness must be increased to promote greater responsibility for the protection of the fragile coral and reef ecosystems of the Maldives.  相似文献   

金属矿地震散射波场的数值模拟研究   总被引：7，自引：0，他引：7  

孙明  林君 《地质与勘探》2001,37(4):68-70

地震方法用于寻找石油、煤田等沉积层控矿床已取得许多成功经验和大量的成果；对于金属矿可依据微扰理论，通过地震波散射响应的强弱推断矿体。模拟实验结果表明，散射波相干性的好坏与杂乱散射体的不均匀性有关；不均匀性越强，产生的散射相干性就越好。  相似文献   

Malaria and related environmental issues in India: a case study of Aligarh city     

Abha Lakshmi Singh  Atiqur Rahman 《GeoJournal》2001,53(1):89-99

Malaria is one of the most widespread diseases in the world. Endemic malaria no longer occurs in many temperate zones as a result of social and economic improvement. At present malaria is the Third World's most dreaded killer. It kills over 1 million people and causes 300–500 million episodes of illness. In India, malaria-reported deaths have shown an upward trend. In 1955, a drive to eradicate malaria was launched in India. But after initial success it failed and malaria made a comeback. Malarial mosquitoes generally prefer unpolluted natural breeding sites but now they have adapted to the changed urban environment. In this paper, an attempt has been made to examine the occurrence of malaria and related environmental issues in a small town of India. Aligarh city, lying in the shadow of the country's capital New Delhi, was selected as a case study. Data were collected mainly from household surveys with the help of questionnaire interviews. About 2,185 households belonging to different income groups were sampled. The differences in the occurrence of malaria in the different income households (in 87% low, 69% lower-middle, 65% middle, 14% upper-middle, and 5% upper) suggest that most of these differences are related to the environmental conditions existing inside and outside their homes, such as poor drainage system, poor sullage disposal, open blocked drains, waterlogging and indoor water storage in open containers. Commitment both by the Government and local residents is needed to improve the environmental conditions and eradicate malaria.  相似文献