全文获取类型
收费全文 | 866篇 |
免费 | 36篇 |
国内免费 | 10篇 |
专业分类
测绘学 | 18篇 |
大气科学 | 63篇 |
地球物理 | 198篇 |
地质学 | 376篇 |
海洋学 | 82篇 |
天文学 | 104篇 |
综合类 | 3篇 |
自然地理 | 68篇 |
出版年
2023年 | 3篇 |
2022年 | 6篇 |
2021年 | 13篇 |
2020年 | 18篇 |
2019年 | 17篇 |
2018年 | 25篇 |
2017年 | 33篇 |
2016年 | 32篇 |
2015年 | 36篇 |
2014年 | 41篇 |
2013年 | 62篇 |
2012年 | 39篇 |
2011年 | 52篇 |
2010年 | 64篇 |
2009年 | 65篇 |
2008年 | 46篇 |
2007年 | 55篇 |
2006年 | 43篇 |
2005年 | 44篇 |
2004年 | 39篇 |
2003年 | 21篇 |
2002年 | 19篇 |
2001年 | 8篇 |
2000年 | 9篇 |
1999年 | 10篇 |
1998年 | 8篇 |
1997年 | 9篇 |
1996年 | 10篇 |
1995年 | 4篇 |
1994年 | 5篇 |
1993年 | 3篇 |
1992年 | 5篇 |
1991年 | 3篇 |
1989年 | 6篇 |
1988年 | 2篇 |
1987年 | 5篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1984年 | 5篇 |
1983年 | 3篇 |
1982年 | 4篇 |
1981年 | 5篇 |
1980年 | 4篇 |
1979年 | 3篇 |
1977年 | 4篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1972年 | 2篇 |
1969年 | 2篇 |
1968年 | 3篇 |
排序方式: 共有912条查询结果,搜索用时 0 毫秒
911.
Pyrolysis in the presence of tetramethylammonium hydroxide (TMAH) has been widely used to characterize natural organic matter from various environments and affords methylated counterparts of amino acids, especially glycine and alanine. The present study, based on TMAH pyrolysis of dipeptides, shows that caution should be exercised in interpreting the presence of such compounds, as amino acids other than glycine and alanine may be responsible for the formation of N,N-dimethylglycine methyl ester and N,N-dimethylalanine methyl ester, even when present in peptide bonds. 相似文献
912.
Nicolas Estrade Jean Carignan Jeroen E. Sonke Olivier F.X. Donard 《Geostandards and Geoanalytical Research》2010,34(1):79-93
With the emergence of new analytical techniques and the expansion of scientific fields explored by using mercury isotopes, the community needs reference materials (RM) to validate and assure the accuracy of the results. The present work investigates (1) the characterisation of secondary RM in order to validate analytical systems, (2) the effects of two complex matrices on isotopic determination using stannous chloride cold vapour generation coupled to MC-ICP-MS (CV-MC-ICP-MS), (3) the effects of multiple digestion techniques for total Hg extraction and (4) the characterisation of nine geo-bio-environmental RM. Two secondary mono-elemental RMs analysed using two different analytical setups yielded isotopic compositions on δ202Hg of −3.54 ± 0.27‰ (CRPG-F65A, 2SD, n = 38) and +2.59 ± 0.19‰ (CRPG-RL24H, 2SD, n = 30) relative to the CRM NIST SRM 3133. These two RMs cover the whole range of Hg isotopic fractionation in natural samples and are made available to the scientific community. Complex fly ash and hydroxysulfate green rust matrices were synthesised, spiked with NIST SRM 3133, then digested and finally analysed versus the mono-elemental NIST SRM 3133 to show potential effect of these complex matrices during CV-MC-ICP-MS. Three digestions techniques, including traditional acid digestion, microwave digestion and high pressure-high temperature digestion, were applied to the lichen RM BCR-482 in order to compare advantages and drawbacks of these methods. Finally, the isotopic compositions of nine RMs including soils (NIST SRM 2711; GXR-2; GSS-4), sediment (GSD-10), jasperoid (GXR-1), ore deposit (GXR-3), fly ashes (BCR-176; BCR-176R) and lichen (BCR-482) are reported. These selected materials have δ202Hg values ranging from −1.75‰ to +0.11‰. Some RMs also presented mass-independent fractionation with Δ199Hg and Δ201Hg of up to −0.6‰. 相似文献