全文获取类型
收费全文 | 6687篇 |
免费 | 1277篇 |
国内免费 | 1670篇 |
专业分类
测绘学 | 506篇 |
大气科学 | 1399篇 |
地球物理 | 1586篇 |
地质学 | 3340篇 |
海洋学 | 863篇 |
天文学 | 370篇 |
综合类 | 738篇 |
自然地理 | 832篇 |
出版年
2024年 | 33篇 |
2023年 | 126篇 |
2022年 | 346篇 |
2021年 | 387篇 |
2020年 | 314篇 |
2019年 | 332篇 |
2018年 | 394篇 |
2017年 | 323篇 |
2016年 | 389篇 |
2015年 | 350篇 |
2014年 | 406篇 |
2013年 | 420篇 |
2012年 | 382篇 |
2011年 | 401篇 |
2010年 | 399篇 |
2009年 | 360篇 |
2008年 | 355篇 |
2007年 | 316篇 |
2006年 | 247篇 |
2005年 | 198篇 |
2004年 | 181篇 |
2003年 | 149篇 |
2002年 | 186篇 |
2001年 | 176篇 |
2000年 | 173篇 |
1999年 | 295篇 |
1998年 | 298篇 |
1997年 | 257篇 |
1996年 | 263篇 |
1995年 | 200篇 |
1994年 | 185篇 |
1993年 | 137篇 |
1992年 | 118篇 |
1991年 | 95篇 |
1990年 | 96篇 |
1989年 | 72篇 |
1988年 | 61篇 |
1987年 | 57篇 |
1986年 | 44篇 |
1985年 | 26篇 |
1984年 | 21篇 |
1983年 | 10篇 |
1982年 | 14篇 |
1981年 | 14篇 |
1980年 | 10篇 |
1979年 | 4篇 |
1977年 | 2篇 |
1976年 | 3篇 |
1938年 | 2篇 |
1936年 | 3篇 |
排序方式: 共有9634条查询结果,搜索用时 15 毫秒
201.
The incidence of lung cancer in the Gejiu area of Yunnan Province ranks the first in the world.The radon level(indoor,soil) was measured in the Gejiu area by the SSNTD method from 1990 to 1996,The result indicates an extensive high-level of indoor radon in that area though U and Th are lower in local limestones,The indoor radon level of houses located in the geologic fault zone is 6 times high that 2km far from the fault zone.The reason probably is that the radon level of soil in the fault is 6-8 times high that 1 km far from the faults.our data indicate that a lower range of radon levels,0-100Bq.m^-3,exists in healthy families.However,a higher radon level,over 800 Bq.m^-3,is often found corresponding to that of cancer patients‘ homes(the house-owners are suffering from either lung cancer or leukaemia or liver cancer),Obviously,an increase in lung cancer incidence follows an increase in indoor radon level,The risk of cancer induced by indoor radon is no longer an inference,but a fact. 相似文献
202.
Meihua Lu Albrecht W. Hofmann Maurizio Mazzucchelli Giorgio Rivalenti 《Chemical Geology》1997,140(3-4):207-222
Geochemical data are presented for the meta-igneous, mafic-ultramafic complex near Finero. This complex is in contact with a phlogopite-bearing mantle peridotite and is subdivided into the Internal Gabbro unit, the Amphibole Peridotite unit, and the External Gabbro unit. The Internal Gabbro and the Amphibole Peridotite units consist of coarse-grained, chemically heterogeneous cumulates, whereas the External Gabbro unit is generally massive, chemically more uniform and approximately representative of the residual melt with MgO contents between 6.6 and 9.1% and Mg numbers between 38 and 58. Both whole-rock and mineral contents of Ni and Cr are significantly higher (at similar Mg numbers) in the Amphibole Peridotite unit than in the Internal Gabbro unit. The most straightforward interpretation of this is that the Amphibole Peridotite unit accumulated after the influx of fresh mafic (or ultramafic) magma into the magma chamber. Major-element chemical trends are continuous from the Amphibole Peridotite unit to the External Gabbro unit and are consistent with closed-system fractionation with no further addition of magma or contamination by wall or roof rock assimilation. In the External Gabbro unit, total FeO and TiO2 contents are strongly correlated with each other (and with P2O5 and Zr) and reach values as high as 19 and 4%, respectively, indicating an advanced degree of crystal fractionation along a tholeftic trend. The External Gabbro samples have generally smooth normalized trace element patterns, which are consistent with being representative of a liquid composition. The residual nature of the External Gabbro magma is also indicated by negative Eu and Sr anomalies, clear evidence for prior feldspar fractionation. REE patterns are otherwise indistinguishable from N-type MORB, but Th and U are significantly more depleted than in MORB. This Th and U depletion is similar to that found in olivine basalts and picrites on Iceland and Hawaii; its origin is not well understood. No evidence is seen for any assimilation of crystal material, in sharp contrast with the situation of the igneous complex in Val Sesia near Balmuccia, where the magma composition is dominated by assimilation of crust. We suggest that the heat provided by at most two injections of magma near Finero was insufficient to induce crystal anatexis, in contrast with the excess heat supplied by multiple magma injections at Balmuccia. 相似文献
203.
相山铀矿田成矿作用的地球化学模拟 总被引:4,自引:0,他引:4
相山铀矿田是我国最大的火山岩型热液铀矿田,在地质地球化学和高温高压实研究的基础上,利用地球化学模式程序EQ3/6模拟了成矿热水溶液的形成过程和减压排泄区铀成矿作用。计算机模拟结果表明,通过大气降水与碎斑熔岩相互作用,可以形成富含F和SiO2等矿化剂的含铀热水溶液;由于铀以UO2F^3和UO2(CO3(^2-3等配合形式存在,非常稳定,即使在深部强还原环境中仍能能够迁移;酸性和碱性环境,尤其是强酸性 相似文献
204.
华北克拉通-扬子克拉通与秦岭造山带古地幔组成及状态的对比 总被引:4,自引:1,他引:4
经研究,华北克拉通古地幔以含石榴石的二辉橄榄岩、方辉橄榄岩及纯橄榄岩为主.地幔交代作用强烈,岩石富集不相容元素,明显高于南非及西澳克拉通者.扬子克拉通古地幔主元素亏损程度差,交代作用较弱,岩石为石榴石/尖晶石二辉橄榄岩.秦岭造山带壳、幔交界带的岩石类型复杂,包括蛇纹石化尖晶石二辉橄榄岩(蛇纹岩)、石榴石辉石岩、榴闪岩、变辉长岩及变玄武岩等.蛇纹岩遭受强的塑性流变,剪切变形结构发育.与克拉通相比,地幔交代作用很弱.3个地幔域的古地温状态有差异,秦岭造山带最高,扬子克拉通居中,华北克拉通最低.上述结果表明,两克拉通的古地幔特征相差显著,暗示经历了不同的演化过程.交代作用可能发生在1700Ma以前和1100~500Ma,后者强于前者.造山带地幔的剪切变形明显强于克拉通地幔 相似文献
205.
临沧超大型锗矿床有机质与锗矿化的地球化学特征 总被引:10,自引:3,他引:10
临沧锗矿床是一产于第三系含煤岩系中的超大型矿床。矿床的最初锗源与盆地西缘的二云母花岗岩有关。主矿体产于下煤组沉积旋回的早期地层中,每一沉积阶段早期形成的褐煤和碳质泥岩中富含锗,最高含量达1470×10^-6。褐煤和碳质泥岩在矿化过程中平均富集了164-169倍。根据锗含量,褐煤和碳质泥岩可分为锗含量小于12×10^-6的低锗煤(泥岩)和大于90×10^-6的高锗煤(泥岩)。高锗煤中有机质富含氧官能 相似文献
206.
The temporal and spatial characteristics of the surface air temperature variations over the Antarctic and its surrounding area 总被引:1,自引:0,他引:1
The characteristics of the spatial distribution, temporal variations trend and oscillation for the surface air temperature
variations during 1957—1993 in the Antarctic and its surrounding area were analyzed. The results show that the short-time
climate change in the Antarctic is complex both temporally and spatially. The Antarctic is by no means the strongest responding
region to the global greenhouse effect. There is a distinguished difference in the trends of the temperature changes for the
Antarctic and global mean, which could not be explained simply by the global greenhouse effect.
Project supported by the National Antarctic Key Project of China (85-905). 相似文献
207.
New40Ar/39Ar plateau ages from rocks of Changle-Nanao ductile shear zone are 107.9 Ma(Mus), 108.2 Ma(Bi), 107.1 Ma(Bi), 109.2 Ma(Hb)
and 117.9 Ma(Bi) respectively, which are concordant with their isochron ages and record the formation age of the ductile shear
zone. The similarity and apparent overlap of the cooling ages with respective closure temperatures of 5 minerals document
initial rapid uplift during 107–118 Ma following the collision between the Min-Tai microcontinent and the Min-Zhe Mesozoic
volcanic arc. The40Ar/39 Ar plateau ages, K-Ar date of K-feldspar and other geochronologic information suggest that the exhumation rate of the ductile
shear zone is about 0.18–1.12 mm/a in the range of 107–70 Ma, which is mainly influenced by tectonic extension. 相似文献
208.
图像配准和融合及其在医学影像中的应用 总被引:2,自引:2,他引:2
图像配准和融合是图像分析和处理的基本问题,在医学影像、遥感、计算机视觉等领域有着广泛的应用。本文研究它们在多模态医学影像技术中的应用。本文提出并实现了基于Fourier变换的图像配准和基于子波变换的图像融合方法,在图像融合中,我们采用特征选择的取大原则,这种准则更适合于来自不同图像中的明显特征 相似文献
209.
在计算覆盖整个黄晔裂谷200口人工井(包括少部分探井)沉降量的基础上,总结本区二种基本沉降曲线模式。统计出热沉降(St)与初始沉降(Si)之比为0.6,依此为约束条件与大陆岩石圈伸展的地球动力学正演模式进行对比,与简单剪切模式预测的热沉降与初始沉降之比值及几何效应更接近。进一步证实黄骅裂谷以简单剪切机制形成的地球动力学模式更合理,这与著名的以纯剪模式形成的北海伸展盆地不同 相似文献
210.