全文获取类型
收费全文 | 184篇 |
免费 | 20篇 |
国内免费 | 23篇 |
专业分类
测绘学 | 8篇 |
大气科学 | 3篇 |
地球物理 | 32篇 |
地质学 | 78篇 |
海洋学 | 84篇 |
综合类 | 5篇 |
自然地理 | 17篇 |
出版年
2023年 | 2篇 |
2022年 | 4篇 |
2021年 | 5篇 |
2020年 | 3篇 |
2019年 | 7篇 |
2018年 | 4篇 |
2017年 | 1篇 |
2016年 | 5篇 |
2015年 | 7篇 |
2014年 | 9篇 |
2013年 | 19篇 |
2012年 | 15篇 |
2011年 | 13篇 |
2010年 | 7篇 |
2009年 | 11篇 |
2008年 | 12篇 |
2007年 | 10篇 |
2006年 | 13篇 |
2005年 | 8篇 |
2004年 | 7篇 |
2003年 | 8篇 |
2002年 | 5篇 |
2001年 | 2篇 |
2000年 | 5篇 |
1999年 | 11篇 |
1998年 | 3篇 |
1997年 | 7篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1994年 | 5篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1981年 | 3篇 |
排序方式: 共有227条查询结果,搜索用时 15 毫秒
51.
作者阐述了聚甲醛污水的水质特点,提出了聚甲醛污水工程的设计要点,介绍了两个聚甲醛污水工程实例,并对已实施的工程进行了总结。 相似文献
52.
53.
Sewage sludges are potential targets for economic extraction of Au because of the documented Au content of sewage sludges worldwide, which are of the order of some ore deposits currently mined for Au. The sewage of Melbourne, Australia, was stockpiled in large, closed, lagoonal tanks from 1898 until 1980. Reeves, Plimer and Foster, 1999, have conducted, and published, an extensive and exhaustive study of the Werribee sewage reserves utilising RNAA, INAA, GFAAS, ICPMS, and FLAAS to determine 31 elements, including Au, Ag, Sb, As, Cd, Hg, Zn, Cu, and Pb. The study was initiated to determine Au, Ag and other metal variations in both space and time and to investigate the economics of chemical extraction of the precious metals. A total of 149 samples from over 50 hand-auger drillholes to a depth up to 4m were analysed from the stockpiles, with Au assays yielding remarkably consistent results. Average grades of 0.77 g/t Au and 18.8 g/t Ag have been documented for a measured resource of 770,000 m3. Laboratory-based extractive metallurgy of the Werribee sludges has demonstrated that Au, Ag, and Zn can be removed with relative ease by heap-leaching using modified conventional technology, albeit with prohibitive reagent consumption. The extraction of the precious metals also results in the variable removal of contaminant metals such as Cd, As, Sb, Hg and Cr which may render the sludges fit for sale as agricultural fertiliser, provided organic pollutants and pathogenic organisms are below governmental environmental protection limits. 相似文献
54.
Xuyin YUAN Zhiyong SHEN Xu DENG Yun GAO 《中国地球化学学报》2006,25(B08):140-141
Several rivers researched around Taihu Lake in Chinese eastern plain are distributed to the west of the lake. Pollutants of different types from tributaries and inlets flow directly into the main rivers and finally into the lake. They change trace elements of rivers fi'om which we can analyze. Researches about trace elements are helpful for understanding the pollutant characteristics, industrial structure and agricultural cultivation in the area of network rivers in the plain of China. Samples of water column, suspended matter and sediment were collected fi'om the west rivers of Taihu Lake, which represent three typical rivers. Observation in the field and the primary composition analysis showed the Caoqiao River was mainly contaminated by industrial wastewater, the Liangxi River was discharged by domestic sewage and the Dapu River was principally input by farmland runoff. REE concentrations and their normalized curves showed obvious characters for rivers discharged by different sewages. The contents of total REE in water column followed the order of the Caoqiao River, the Dapu River and the Liangxi River fi'om high to low. TREEs in suspended matter and sediments follow the order of the Dapu River 〉 the Caoqiao River 〉 the Liangxi River. REE normalized curves (for Australia shale) suggested that significant diversities were presented in water column, suspended matter and sediments, i.e., heavy REE enrichment in water, middle REE enrichment in suspended matter, and smooth curves for sediments. But the heavy pollution resulted in several anomalous curves in the same rivers. Some element ratios were selected as indices for polluted rivers based on their geochemical properties and diversities between rivers. The results displayed the discriminative indices for water column, suspended matter and sediment. The effective indices were Pb/Fe, Cr/Fe, Ni/Fe, Pb/Ni, Zn/Ni for water column, Cu/Al, Cu/Fe, Zn/Fe, K/Ca, K/Na, Pb/Co, Zn/Co for suspend matter and Pb/Fe, K/Ca, Ca/Mg, Zn/Ni for sediment, respectively. In general, rivers mainly discharged by industrial sewage have high ratios of Pb/Ni, K/Ca, are enriched in the middle REE and have positive Gd anomaly. The domestic sewage flowing into rivers reveals high ratios of Zn/Ni, Pb/Fe, and is enriched in the heavy REE, and has the positive Eu anomaly. If runoff of farmland enters into the rivers, it will have high ratios of Ca/Mg, K/Na, high lanthanum, and show the smooth normalized curves of REE. 相似文献
55.
针对GIS环境下污水管网设计问题,提出了一种快速计算管段设计流量的方法——递归方法。分析了递归的原理、链式表的建立以及递归算法的具体实现等,并以实例阐述了递归计算的各个步骤 相似文献
56.
57.
58.
59.
60.
Geotechnical properties of municipal sewage sludge 总被引:3,自引:0,他引:3
Brendan C. O’Kelly 《Geotechnical and Geological Engineering》2006,24(4):833-850
The geotechnical properties of municipal sewage sludge, in particular those pertinent to the handling and landfilling of the
material, are presented. Index, drying, compaction, shear strength and consolidation tests were conducted on the material
at different states of biodegradation. The organic content and specific gravity of solids were found to be inversely related,
with typical organic contents of 50–70% and specific gravity of solids values of 1.55–1.80. The density of the compacted material
was low in comparison with mineral soils. Standard Proctor compaction yielded a maximum dry density of 0.56 tonne/m3 at 85% water content. Laboratory vane-shear and triaxial compression tests indicated that, below about 180% water content,
the shear strength of the sludge material increased exponentially with reducing water content. Consolidated-undrained triaxial
compression tests on the pasteurised sludge material indicated an effective angle of shearing resistance of 32° for the moderately
degraded material and 37° for the strongly degraded material. Biogas was produced at rates of up to 0.33 L/day/kg slurry due
to ongoing biodegradation and the resulting pore pressure response must be taken into account in any stress analysis. Consolidation
tests using the hydraulic consolidation cell, oedometer and triaxial apparatus indicated that the sludge material was highly
compressible although practically impermeable, for example the coefficient of permeability for the moderately degraded slurry
was of the order of 10−9m/s. However, creep deformation was significant with typical coefficient of secondary compression values of 0.02–0.08 for
the compacted material. A more free-draining material was produced at higher states of biodegradation. 相似文献