全文获取类型
收费全文 | 4100篇 |
免费 | 1013篇 |
国内免费 | 1852篇 |
专业分类
测绘学 | 31篇 |
大气科学 | 17篇 |
地球物理 | 170篇 |
地质学 | 6277篇 |
海洋学 | 59篇 |
综合类 | 295篇 |
自然地理 | 116篇 |
出版年
2024年 | 23篇 |
2023年 | 77篇 |
2022年 | 132篇 |
2021年 | 152篇 |
2020年 | 147篇 |
2019年 | 210篇 |
2018年 | 140篇 |
2017年 | 183篇 |
2016年 | 252篇 |
2015年 | 220篇 |
2014年 | 334篇 |
2013年 | 293篇 |
2012年 | 354篇 |
2011年 | 351篇 |
2010年 | 314篇 |
2009年 | 285篇 |
2008年 | 238篇 |
2007年 | 333篇 |
2006年 | 292篇 |
2005年 | 250篇 |
2004年 | 241篇 |
2003年 | 221篇 |
2002年 | 212篇 |
2001年 | 236篇 |
2000年 | 198篇 |
1999年 | 217篇 |
1998年 | 184篇 |
1997年 | 175篇 |
1996年 | 144篇 |
1995年 | 103篇 |
1994年 | 101篇 |
1993年 | 62篇 |
1992年 | 65篇 |
1991年 | 58篇 |
1990年 | 44篇 |
1989年 | 36篇 |
1988年 | 28篇 |
1987年 | 21篇 |
1986年 | 25篇 |
1985年 | 7篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1975年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有6965条查询结果,搜索用时 15 毫秒
1.
王发君 《中国海洋湖沼学报》1992,10(1):84-91
Based on a puff model . and together with the consideration of convection , dispersion and descent of suspended waste particles in marine environment , a numerical model is presented to predict the initial sedimentation of waste particles discharged from ocean outfalls in coastal waters and to compute the stable sedimentation rate in homogeneous trde current fields with water depth constant . When the time step selected is small enough , the results from this model agree well with that from the semi-analytical solution , and have sufficient precision for evaluating the impact on the environment caused by sedimentation of waste particles discharged from ocean outfalls. A numerical example is given for predicting the sedimentation of waste particles discharged in Heishijiao , Dalian . 相似文献
2.
四川石棉大水沟独立碲矿床堪称世界首例,其矿体两侧的围岩蚀变较窄,且蚀变带与矿脉及未蚀变岩呈清楚而截然的接触关系。主要围岩蚀变为白云石化、白(绢)云母化、云英岩化及电气石化等。这些蚀变作用分别发生于177.7~165.1Ma和91.71~80.19Ma。蚀变作用过程中SiO2大量析出,Al2O3、TiO2、CaO、MgO、K2O、H2O、CO2、Fe2O3、MnO则有不同程度地带入。与此同时,REE在此过程中包集体迁出,Te、Bi、AS等元素的含量则决定于蚀变作用及其强度,而与原岩无关。 相似文献
3.
矿床谱系是对成矿多样性的理论概括,而成矿多样性又是由不同级别、不同性质的致矿地质异常决定的.本文论述了山东省内生金矿矿床谱系及其致矿地质异常. 相似文献
4.
秦岭凤太矿田层控铅锌(铜)矿床的金属物质、硫和成矿溶液主要来自深部基底的岩石,属海底喷流—沉积成因矿床。从这一理论认识出发可进一步分析控矿地质条件及今后在该区有效地寻找同类矿床。 相似文献
5.
张和庆 《广东海洋大学学报》2003,23(5):15-23
介绍了我国海洋倾废的历史、发展过程和管理现状 ,分析了海洋倾倒的现状和面临的困难。文章还提出通过高新技术把疏浚泥迅速转化为再生资源进行利用和污染土无害化处理技术 ,从根本上减少疏浚泥海洋倾倒的数量和缓减海洋倾倒区紧张的状况 ,减少对海洋环境的污染 相似文献
6.
7.
Anhydrite pseudomorphs and the origin of stratiform Cu–Co ores in the Katangan Copperbelt (Democratic Republic of Congo) 总被引:1,自引:1,他引:0
Ph. Muchez P. Vanderhaeghen H. El Desouky J. Schneider A. Boyce S. Dewaele J. Cailteux 《Mineralium Deposita》2008,43(5):575-589
The stratiform Cu–Co ore mineralisation in the Katangan Copperbelt consists of dispersed sulphides and sulphides in nodules
and lenses, which are often pseudomorphs after evaporites. Two types of pseudomorphs can be distinguished in the nodules and
lenses. In type 1 examples, dolomite precipitated first and was subsequently replaced by Cu–Co sulphides and authigenic quartz,
whereas in type 2 examples, authigenic quartz and Cu–Co sulphides precipitated prior to dolomite and are coarse-grained. The
sulphur isotopic composition of the copper–cobalt sulphides in the type 1 pseudomorphs is between −10.3 and 3.1‰ relative
to the Vienna Canyon Diablo Troilite, indicating that the sulphide component was derived from bacterial sulphate reduction
(BSR). The generation of during this process caused the precipitation and replacement of anhydrite by dolomite. A second product of BSR is the generation
of H2S, resulting in the precipitation of Cu–Co sulphides from the mineralising fluids. Initial sulphide precipitation occurred
along the rim of the pseudomorphs and continued towards the core. Precipitation of authigenic quartz was most likely induced
by a pH decrease during sulphide precipitation. Fluid inclusion data from quartz indicate the presence of a high-salinity
(8–18 eq. wt.% NaCl) fluid, possibly derived from evaporated seawater which migrated through the deep subsurface. 87Sr/86Sr ratios of dolomite in type 1 nodules range between 0.71012 and 0.73576, significantly more radiogenic than the strontium
isotopic composition of Neoproterozoic marine carbonates (87Sr/86Sr = 0.7056–0.7087). This suggests intense interaction with siliciclastic sedimentary rocks and/or the granitic basement.
The low carbon isotopic composition of the dolomite in the pseudomorphs (−7.02 and −9.93‰ relative to the Vienna Pee Dee Belemnite,
V-PDB) compared to the host rock dolomite (−4.90 and +1.31‰ V-PDB) resulted from the oxidation of organic matter during BSR. 相似文献
8.
9.
文章通过详细的野外地质调查和系统的岩石化学、稀土元素、微量元素及硅、氧同位素等研究,探讨了羊蹄子山-磨石山钛矿区无矿白色硅质岩和富钛硅质岩的成因及形成地质构造环境。研究结果表明,呈厚层状产出的无矿白色硅质岩具较高的SiO2、Al2O3含量及Al/(Al Fe Mn)、Al2O3/(Al2O3 Fe2O3)比值,稀土元素总量很低,其北美页岩标准化配分模式为向右倾的曲线,无明显铈异常和铕异常,表明其形成于受陆源影响的大陆边缘构造环境;赋矿岩系中薄层状富钛硅质岩的TiO2、Fe2O3、Cu、V含量较高,但Al/(Al Fe Mn)、Al2O3/(Al2O3 Fe2O3)比值较低,稀土元素总量较高,北美页岩标准化曲线为明显左倾型-平坦型,具弱的负铈异常,表明其形成于洋脊及附近环境。两种硅质岩的δ30Si值为变化较小的负值,与热水沉积和某些生物成因硅质岩的硅同位素组成相似,两者的δ18O值范围和平均值均相似。两类硅质岩的成因及形成构造环境不同,富钛硅质岩的地球化学特征表明,该矿床的形成与本区元古宙海底火山热液喷流作用有关。 相似文献
10.
This work deals with disposal of slurries generated during the cutting and polishing processes of slabs of decorative sedimentary
carbonate rocks in the north western Sicily. At present, they are used as fillers of dismantled quarries near the sawmills
and, as a final step of reclamation, are covered with earth layers. In spite of such inexpensive solution, there is lack of
knowledge about the composition of the waste. In order to assess if there is any threat for the environment and to suggest
indications for alternative solutions, such as recycling or inactivation processes, the slurries were analysed by XR diffraction,
simultaneous thermal analysis, ICP/MS, ionic chromatography, FTIR, UV-Vis, COD and TOC measurements, grain size analysis.
Results indicate that the slurries can threaten the groundwater, because of the high chemical oxygen demand; furthermore they
can modify the mechanism of groundwater recharge, because of their grain size distribution. Some laboratory tests show that,
even in very aggressive conditions, the solid pollutants persist in the waste and slowly release into water the products of
their degradation. The slurry therefore should be subjected to inactivation treatment before disposal or, alternatively, recycled
as secondary raw material for a suitable process. 相似文献