全文获取类型
收费全文 | 688篇 |
免费 | 113篇 |
国内免费 | 220篇 |
专业分类
测绘学 | 12篇 |
大气科学 | 13篇 |
地球物理 | 18篇 |
地质学 | 741篇 |
海洋学 | 161篇 |
综合类 | 60篇 |
自然地理 | 16篇 |
出版年
2024年 | 3篇 |
2023年 | 9篇 |
2022年 | 37篇 |
2021年 | 23篇 |
2020年 | 22篇 |
2019年 | 27篇 |
2018年 | 24篇 |
2017年 | 13篇 |
2016年 | 16篇 |
2015年 | 26篇 |
2014年 | 35篇 |
2013年 | 29篇 |
2012年 | 35篇 |
2011年 | 57篇 |
2010年 | 30篇 |
2009年 | 25篇 |
2008年 | 36篇 |
2007年 | 25篇 |
2006年 | 57篇 |
2005年 | 37篇 |
2004年 | 20篇 |
2003年 | 39篇 |
2002年 | 37篇 |
2001年 | 50篇 |
2000年 | 31篇 |
1999年 | 28篇 |
1998年 | 27篇 |
1997年 | 27篇 |
1996年 | 29篇 |
1995年 | 16篇 |
1994年 | 25篇 |
1993年 | 31篇 |
1992年 | 21篇 |
1991年 | 22篇 |
1990年 | 14篇 |
1989年 | 19篇 |
1988年 | 1篇 |
1987年 | 4篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1972年 | 1篇 |
1951年 | 1篇 |
1941年 | 1篇 |
排序方式: 共有1021条查询结果,搜索用时 15 毫秒
11.
12.
南海西部表层沉积物钙质浮游生物分布与碳酸盐溶解 总被引:1,自引:0,他引:1
对南海西部300多个表层沉积样品中的浮游有孔虫和钙质超微化石定量分析表明,几乎所有样品均含浮游有孔虫、钙质超微化石,但丰度相差十分悬殊,浮游有孔虫丰度介于0.5~36673个/g之间,钙质超微化石丰度为0~1725个/10个视域,两者的分布规律相似。在陆坡区钙质浮游生物最富集,尤其在西沙群岛西南、南沙西部礁滩附近海区丰度最高;向深海盆区和陆架浅水区,钙质浮游生物丰度均下降。但从两者的丰度分布来看,其溶解程度不同,浮游有孔虫更容易溶解,在200~2000m水深区,丰度最高,2000m以下丰度锐减;而钙质超微化石的最富集区在500~3000m,且3000m以下仍较丰富。从碳酸盐的分布来看,本区碳酸盐的临界补偿深度(CCrD)为3500m,而CCD大于4300m,碳酸盐的溶解主要由有孔虫和钙质超微化石构成。 相似文献
13.
1997年10月,在巴基斯坦外海的聚合大陆边缘得到了新的垂直入射、广角反射和折射数据。似海底反射(BSR)是横穿整个大陆边缘至阿曼海湾的最突出的反射特征。一般这一反射同气体水合物稳定带底的期望深度相一致。增生棱柱体上的BSR是一个清晰的反极性反射,且BSR之下的地层表现出反射率增强,这表明地层间存在被捕获的气体。广角反射和折射数据的联合反演在BSR深度处产生约200m厚的低速带。利用Born展开式,可根据反褶积和平衡处理后的单道数据来计算带限阻抗记录,结果表明BSR处的速度下降约200ms^-1。在朝海岸方向的CDP4400处,Minshull和White(1989)等人得到一个约600ms^-1的速度倒置,此结果表明BSR的特征在越过巴基斯坦外海大陆边缘时显著变化。海湾下的BSR出现在相似的海底地层深度,此处的地震反射出现亮点。然而,其反振幅异常小,且BSR下方的反射地层没有表现出反射率增强。广角反射和折射数据的联合走时反演表明:持续上升的速度暗示了有充足的甲烷以形成游离气和气体水合物,且主要受沉积物同化为增生棱柱体的限制。我们认为当沉积物同化为增生棱柱体时,这些变异与构造抬升和正在进行的沉积引起的一个渐进过程有关。沉积和抬升造成等温线向上偏移,并因此导致气体水合物的分解,释放出的甲烷气体造成BSR增强。我们的地质调查反映了深海平原以及第一个倾斜盆地内水深分别为3300m和2490m处的BSR属性。CDP4400位于近岸的一个隐伏、隆起演化的盆地内,水深为1730m。因此我们提出,在加积楔内,区域构造抬升与正进行的沉积引致稳定区域的向上偏移造成水合物循环。此外,通过甲烷的深度平流,构造脱水作用可以在稳定区域底部积聚水合物。 相似文献
14.
15.
根据酸性凝灰岩和酸性火山事件粘土岩的自然伽马测井曲线,对当前流传的"沉积岩层的放射性强度(或放射性核素的含量)随泥质含量的增加而增高"的概念和用自然伽马值及经验公式求泥质含量提出质凝。酸性凝灰岩的自然伽马曲线有高异常响应,若解释为泥岩显然是误解,故将沉积岩伽马曲线高异常一律解释为泥岩是片面的。各类火山事件粘土岩的伽马值相差悬殊,但其泥质含量几乎相等,用它们的伽马值计算泥质含量误差甚大。最后对铝土矿层的伽马曲线稍加解释,指出核测井应用的远景。 相似文献
16.
17.
18.
Hairong LI Qinbin LIU Wuyi WANG Xuehui LIU Hailong LI Shuhai LI Xiaoyu ZHAO Lizhen WANG 《中国地球化学学报》2006,25(B08):73-74
Tea bush is one of the plants cultivated in acidic soil, and is a typical hyper-accumulator of F and Al. Brick tea is a kind of brick-formed tea compressed using the older and coarse leaves and branches of tea trees. Brick tea mixed with milk is drunk as a daily indispensable beverage for Mongols, Ewenki, and other minority nationalities in the pastoral and semi-pastoral areas of Northwest China. It is reported that drinking brick tea can result in dental and skeletal fluorosis due to the high F content in it. Because Alzheimer's disease (AD) is related with Al in human brain, and Al has potential toxicities for skeletal and neural systems, 相似文献
19.
Stephanie de Villiers 《中国地球化学学报》2006,25(B08):146-146
Acidification is considered the most important one of the primary chemical stress factors that impact on freshwater ecosystems. In unpolluted freshwater systems, the primary controls on the degree of acidification are factors such as the geological substrate of the catchment area, the presence of organic acids secreted by vegetation in the river system, and equilibrium exchange of carbon dioxide with the atmosphere. Anthropogenic factors that can impact on the degree of acidification of freshwater systems include agricultural, mining and industrial activities, either through direct runoff into river systems or through deposition of atmospheric pollutants from these sources. The capacity factors alkalinity and acidity, which represent the acid- and base-neutralizing capacity (ANC and BCN) of an aqueous system, have been used as more reliable measures of the acidic character of freshwater systems than pH. Unlike pH, ANC and BNC are not affected by parameters such as temperature and pressure. Therefore, ANC has been employed as a predictor of biological status in critical load assessments. Freshwater systems with ANC's eq/L isμeq/L are considered sensitive to acidification, ANC=0 μbelow 150 commonly used as the predictor for fish species such as trout in lakes, and an eq/L as more realistic for streams. Acid-neutralizing capacity μANC value of 40 (ANC) can be determined by titration with a strong acid to a preselected equivalence point. Alternatively, it can be calculated as the difference between base cations ([BC]) and strong acid anions ([SAA]): ANC=[BC]- [SAA]=[Ca^2+]+[Mg^2+]+[Na^+]+[K^+]-[SO4^2-]-[NO3^-]-[Cl^-] To date, there has been no attempt to establish the ANC of South Africa's freshwater ecosystems or variability therein, despite the fact that long-term water quality monitoring data exist for all the parameters needed to calculate it according to the above equations. As a result, the relationship between the acid neutralizing capacity of freshwater ecosystems in South Africa and biodiversity factors, such as fish status, is unknown. Results of the first comprehensive (country-wide scale) evaluation of the acid neutralizing capacity of river systems in South Africa will be presented. Long-term monitoring data obtained from the Department of Water Affairs and Forestry (DWAF) from most of South Africa's river systems were used to establish geographic and temporal variabilities in ANC. The results show that the Berg and Breede River systems are most susceptible to acidification, and that geological substrate appears to explain most of the geographic variabilities observed. 相似文献
20.
Weiyang BAI Xinbin FENG Xuewu FU Tianrong HE Guangle QIU 《中国地球化学学报》2006,25(B08):154-154
In order to find out whether Aha Lake was polluted by the acid mining waste water or not, the concentration and distribution of different mercuryspecies in the water columns and sediment profile collected from Aha Lake were investigated. It was found that discernible seasonal variation of different mercury species in water body were obtained in the Aha Reservoir. With regards to the whole sampling periods, the concentrations of HgP in the Aha Reservoir water body were evidently correlated to the concentrations of total mercury, showing that total mercury was mostly associated with particle mercury. The concentrations of methylmercury in water body were also evidently correlated to the concentrations of dissolved mercury. The dissolved mercury evidently affects the distribution and transportation of methylmercury. However, there is no correlation between methylmercury and total mercury. The dissolved mercury, reactive mercury, dissolved methylmercury levels in the water body of high flow period were much higher than those in low flow period. The distribution, speciation and levels of mercury within the Aha Reservoir water body were governed by several factors, such as the output of river, the release of sediment . Discernible seasonal variation of total mercury and methylmercury in porewater was described during the sampling periods, with the concentrations in high flow period generally higher than those in low flow period. The methylmercury in pore water column was evidently correlated to that of the sediment. The results indicated that highly elevated MeHgD concentrations in the porewater were produced at the depths from 2 to 5 cm in the sediment profile, and decreased sharply with depth. A positive correlation has been found between MeHgD formation and sulfate reducing bacterial activity. These highly elevated concentrations of MeHgD at the intersurface between waters and sediments suggest a favorable methylation condition. Moreover, 相似文献