国外漂白粘土和澄清粘土的产销现状综述   总被引：1，自引：0，他引：1  

孟翠鸣 《化工矿产地质》2003,25(2):110-114,122

漂白粘土和澄清粘土应具有较大的表面积、较高的吸附性能及褪色能力,多由膨润土经活化(酸化)处理后制成。当前,德国、美国在世界漂白土生产中占据重要地位。漂白粘土和澄清粘土世界市场销量约86万t/a,其中70％～80％用于食用油和油脂工业。漂白粘土的发展受食用油工业发展的影响最大,亚洲还有较大的发展空间。澄清粘土多用作葡萄酒、果汁等的澄清剂,也有一定的发展前景。漂白土再利用的途径,仍在探索中。  相似文献   

邛崃4.5级地震与震后趋势判断     

袁海良  朱昌保  宋杰  高进  任寰 《地震地磁观测与研究》2003,24(4):80-83

邛崃地震发生后，成都市地震局很快做出反应，及时开展了地震考察并做出了正确的震后趋势判断，取得了较好的社会效益。  相似文献   

绿色能源,世纪工程——西气东输工程          下载免费PDF全文

史兴全  陈永武 《第四纪研究》2003,23(2):125-133

西气东输工程是国家实施西部大开发战略的重要举措.在鄂尔多斯盆地和塔里木盆地进行的大规模天然气勘探工作表明,可以为西气东输工程准备较为充分的天然气可采储量.同时,根据对河南、安徽、江苏、浙江和上海等五省市天然气需求的预测,天然气需求市场的形势良好.西气东输工程是中国境内第一条达到国际标准的大口径、高压力、长距离输气管道.通过技术攻关和高新技术的应用,西气东输工程从管材及制管、焊接、内涂敷、压缩机增压系统优化、自动化控制到流量计量和焊接的无损检测技术等方面都取得了突破性进展.西气东输工程跨越多个自然环境区和地质构造区带,在工程可行性研究中就环境保护和地质灾害的预防做了大量的研究工作,提出了一系列的保护和预防措施.  相似文献   

Classification of artificial (man-made) ground   总被引：1，自引：0，他引：1  

M. S. Rosenbaum  A. A. McMillan  J. H. Powell  A. H. Cooper  M. G. Culshaw  K. J. Northmore 《Engineering Geology》2003,69(3-4):399-409

The legacy inherited from anthropogenic processes needs to be addressed in order to provide reliable and up-to-date ground information relevant to development and regeneration in the urban environment. The legacy includes voids as well as anthropogenic deposits (artificial ground). Their characteristics derive from former quarrying and mining activities industrial processes creating derelict ground, variably consolidated made ground, and contaminated groundwater and soils. All need to be systematically assessed to inform the planning process and provide the basis for engineering solutions. Site-specific investigation needs to be conducted on the back of good quality geoscientific data. This comes from ‘field’ survey, remotely sensed data interpretation, historical maps, soil geochemical sampling, and geotechnical investigation. Three-dimensional and, in the future, four dimensional, characterization of superficial deposits is required to reach an understanding of the potential spatial lithological variability of artificial ground and the geometry of important surfaces, i.e. the boundary conditions. The classification scheme for artificial ground outlined in this paper and adopted by the British Geological Survey, will help in achieving this understanding.  相似文献   

On the origin of late Quaternary palaeolandslides in the Liège (E Belgium) area     

Demoulin  A.  Pissart  A.  Schroeder  C. 《International Journal of Earth Sciences》2003,92(5):795-805

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Empirical correlations of soil parameters based on Cone Penetration Tests (CPT) for Greek soils     

A. Anagnostopoulos  G. Koukis  N. Sabatakakis  G. Tsiambaos 《Geotechnical and Geological Engineering》2003,21(4):377-387

This study presents the results of Cone Penetration Tests (CPT) and estimated correlations with the results of other in-situ tests (standard penetration test, cross-hole, seismocone) and laboratory tests (classification and undrained shear strength tests). These tests cover nearly all types of penetrable soils in Greece and, together with the formulation of empirical correlations, complement and improve on previous studies due to the significant number of CPT measurements.  相似文献   

气象科技服务的当前形势分析     

熊文兵  周能 《气象研究与应用》2003,24(2):61-63

从市场的角度介绍国内外气象科技服务的现状,分析我国气象科技服务存在的问题和面临的形势,提出应对策略和建议。  相似文献   

试论中国缩微旅游资源     

陈建斌 《地域研究与开发》1997,16(4):80-83

９０年代以来，我国缩微旅游景点出现巨大的投资热潮，随之而来的是巨大的浪费。作者通过对缩微旅游资源的特征与功能、市场容量及其在旅游资源中的地位分析，认为目前中国缩微旅游资源开发区域可分为３个等级，不同等级的区域所采取的缩微旅游资源开发措施及应开发的主题和规模也应有所不同。  相似文献   

Looting, collecting, and the destruction of archaeological resources     

Ricardo J. Elia 《Natural Resources Research》1997,6(2):85-98

Archaeological sites, the material remnants of our human past, are finite and nonrenewable cultural resources that are under constant threat from environmental forces, development activities, warfare, vandalism, and looting. Site looting is the destructive removal of archaeological objects to supply the art market. Looting is part of an economic system, the antiquities market, that works to supply the demand of collectors for archaeological objects. The destruction of archaeological resources by looters is an international crisis and threatens to obliterate the world’s cultural heritage and our ability to understand past cultures. The scale and intensity of the looting problem can be estimated by studying the extent of site destruction in countries of origin and by investigating the sources of antiquities held by collectors. Finding a solution to the problem of looting will require a focus on the demand side of the market (i.e., collectors) instead of the traditional focus on the supply side (looters, dealers)  相似文献   

Race,Gender, and Spatial Segmentation in the Twin Cities*     

Elvin K. Wyly 《The Professional geographer》1996,48(4):431-444

This study analyzes commuting trends in a relatively vibrant setting during the 1980s to determine (a) how labor market segmentation correlates with differences in the spatial dimensions of local labor markets, and (b) whether this link represents a direct spatial effect, independent of earnings, travel mode, and part-time work. I use 1980 and 1990 PUMS data to analyze changes in racial and gender divisions in the workforce, and I develop an estimate of work trip distance to adjust for different travel modes. For all groups except white men, employment in a job “typical” of one's gender and racial group is associated with more localized commutes, but this effect is strongly mediated by variations in earnings and part-time work. Using a covariance structure model to control for these effects, I find no independent link between segmentation and longer commutes among African Americans. Earnings and commute distances remained unchanged over the decade for African Americans, providing no evidence of a purely spatial mismatch manifest in lengthening work trips without corresponding wage gains. The spatial dimensions of an employment mismatch for inner-city minorities are concealed through the replacement of production jobs by poorly paid service work in the expanding downtown economy of a vibrant regional center.  相似文献