全文获取类型
收费全文 | 9645篇 |
免费 | 1054篇 |
国内免费 | 3565篇 |
专业分类
测绘学 | 446篇 |
大气科学 | 1679篇 |
地球物理 | 3420篇 |
地质学 | 5504篇 |
海洋学 | 1008篇 |
天文学 | 404篇 |
综合类 | 694篇 |
自然地理 | 1109篇 |
出版年
2024年 | 68篇 |
2023年 | 179篇 |
2022年 | 118篇 |
2021年 | 208篇 |
2020年 | 123篇 |
2019年 | 125篇 |
2018年 | 182篇 |
2017年 | 69篇 |
2016年 | 152篇 |
2015年 | 154篇 |
2014年 | 254篇 |
2013年 | 254篇 |
2012年 | 310篇 |
2011年 | 380篇 |
2010年 | 215篇 |
2009年 | 291篇 |
2008年 | 333篇 |
2007年 | 448篇 |
2006年 | 488篇 |
2005年 | 562篇 |
2004年 | 559篇 |
2003年 | 384篇 |
2002年 | 445篇 |
2001年 | 482篇 |
2000年 | 510篇 |
1999年 | 250篇 |
1998年 | 189篇 |
1997年 | 206篇 |
1996年 | 173篇 |
1995年 | 225篇 |
1994年 | 184篇 |
1993年 | 403篇 |
1992年 | 336篇 |
1991年 | 438篇 |
1990年 | 379篇 |
1989年 | 408篇 |
1988年 | 445篇 |
1987年 | 371篇 |
1986年 | 265篇 |
1985年 | 357篇 |
1984年 | 296篇 |
1983年 | 216篇 |
1982年 | 165篇 |
1981年 | 123篇 |
1980年 | 178篇 |
1964年 | 89篇 |
1960年 | 55篇 |
1959年 | 119篇 |
1958年 | 125篇 |
1957年 | 127篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
112.
激光烧蚀微探针等离子体质谱的地质应用。自1989年以来,我们实验室就积极开展了激光烧蚀微探针(LAM)试样引入系统的研究工作,这种技术适合于ICP—MS分析地质样品中小体积矿物(激光烧蚀孔穴直径低于10—100μm).对某些样品.采用Nd:YAG激光的基本IR波长(1064nm),作为多数用途,4倍频率(uv)的波长(266nm)能产生较小的直径,并较好地形成孔穴. 相似文献
113.
114.
This study aimed to test the performance of the amphipod Gammarus locusta (L.) in chronic sediment toxicity tests. It constitutes part of a multi-level assessment of chronic toxicity of estuarine sediments, integrating organism and population-level endpoints with biochemical markers responses. Here we account for organism and population-level effects, while biomarker responses were reported in a companion article. Five moderately contaminated sediments from Sado and Tagus estuaries were tested, comprising 3 muddy and 2 sandy sediments. These sediments either did not show acute toxicity or were diluted with control sediment as much as required to remove acute toxicity. Subsequent chronic tests consisted of 28-day exposures with survival, individual growth and reproductive traits as endpoints. Two of the muddy sediments induced higher growth rates in the amphipods, and improved reproductive traits. This was understood to be a consequence of the amount of organic matter in the sediment, which was nutritionally beneficial to the amphipods, while concurrently decreasing contaminant bioavailability. Biomarker responses did not reveal toxicant-induced stress in amphipods exposed to these sediments. One of the sandy sediments was acutely toxic at 50% dilution, but in contrast stimulated amphipod growth when diluted 75%. This was presumed to be an indication of a hormetic response. Finally the two remaining contaminated sediments showed pronounced chronic toxicity, affecting survival and reproduction. The sex ratio of survivors was highly biased towards females, and offspring production was severely impaired. The particulars of the responses of this amphipod were examined, as well as strengths versus limitations of the sediment test. This study illustrates the utility of this chronic test for toxicity assessment of contaminated estuarine sediments, with potential application all along Atlantic Europe. 相似文献
115.
太平洋西南部铁锰矿化的地球化学特征A.H等对克马德克和新赫布里底岛弧-海沟系不同地貌构造采集了海底样品(1990年科学考察船“A.H”院士号第17航次),在一系列测站上采集到不同的铁锰形成物(жMO)。在采自8个测站的38个样品分析资料的基础上研究了... 相似文献
116.
下地壳基性麻粒岩流变强度实验研究 总被引:3,自引:0,他引:3
镁铁质基性麻粒岩被认为可能是大陆下地壳的主要组成岩石[1,2],涉及当前地球动力学研究中地壳变形和高原隆升,壳幔边界的力学耦合与拆离,底侵和拆沉作用等一系列地球动力学问题阳[3,4],具有重要的地球动力学意义.大陆下地壳的流变学性质是我们深入认识这些地球深部过程的关键点之一. 相似文献
117.
华北克拉通北邻中亚造山带,南接秦岭-大别-苏鲁造山带.它通常被认为是约18亿年固结形成的陆块.其基底的形成与演化,一直受到广泛关注(Zhao et al.,1998,2000,2005;Zhai et al.,2000,2005;Wilde et al.,2002,2005;Guo et al.,2005;Kroner et al.,2005,2006;Lu et al.,2008).大多数研究者都注重于华北克拉通内部、北部和东西陆块结合带(中间带),较少关注东南缘基底的形成与演化研究. 相似文献
118.
为了制定斯摩棱斯克州城市建设发展的总体纲要,对城区进行了地质生态评估。为此,根据所采用的方法,编制了地貌图,以此作为评估的基本要素,并且对该州地区地貌特征进行了分析;同时建议利用这些资料作为制定总体纲要工作的独立要素。 相似文献
119.
Ohishi M Ishikawa SI Amano T Oka H Irvine WM Dickens JE Ziurys LM Apponi AJ 《The Astrophysical journal》1996,471(1):L61-L64
A new interstellar molecular ion, H2COH+ (protonated formaldehyde), has been detected toward Sgr B2, Orion KL, W51, and possibly in NGC 7538 and DR21(OH). Six transitions were detected in Sgr B2(M). The 1(1,0)-1(0,1) transition was detected in all sources listed above. Searches were also made toward the cold, dark clouds TMC-1 and L134N, Orion (3N, 1E), and a red giant, IRC + 10216, without success. The excitation temperatures of H2COH+ are calculated to be 60-110 K, and the column densities are on the order of 10(12)-10(14) cm-2 in Sgr B2, Orion KL, and W51. The fractional abundance of H2COH+ is on the order of 10(-11) to 10-(9), and the ratio of H2COH+ to H2CO is in the range 0.001-0.5 in these objects. The values in Orion KL seem to be consistent with the "early time" values of recent model calculations by Lee, Bettens, & Herbst, but they appear to be higher than the model values in Sgr B2 and W51 even if we take the large uncertainties of column densities of H2CO into account. We suggest production routes starting from CH3OH may play an important role in the formation of H2COH+. 相似文献
120.
Near-infrared (J, H and K bands) spectra of nine dark asteroids (chosen among a sample of supposed primitive objects between C and D classes) have been obtained at the Mauna Kea Observatory (Hawaii) with the 2.2-m telescope using KSPEC as spectrograph. The aim of this work was to search for evidence of the presence of organic materials in these objects as found in other planetary bodies as 5145 Pholus, and in some cometary nuclei. A careful analysis of the data has revealed flat or slightly redder spectra than the solar one for all observed asteroids. No evidence of distinct absorption features was found. 相似文献