全文获取类型
收费全文 | 418篇 |
免费 | 99篇 |
国内免费 | 89篇 |
专业分类
测绘学 | 41篇 |
大气科学 | 68篇 |
地球物理 | 67篇 |
地质学 | 185篇 |
海洋学 | 68篇 |
天文学 | 51篇 |
综合类 | 39篇 |
自然地理 | 87篇 |
出版年
2023年 | 9篇 |
2022年 | 10篇 |
2021年 | 13篇 |
2020年 | 14篇 |
2019年 | 21篇 |
2018年 | 18篇 |
2017年 | 18篇 |
2016年 | 13篇 |
2015年 | 16篇 |
2014年 | 24篇 |
2013年 | 24篇 |
2012年 | 15篇 |
2011年 | 23篇 |
2010年 | 24篇 |
2009年 | 22篇 |
2008年 | 9篇 |
2007年 | 7篇 |
2006年 | 24篇 |
2005年 | 15篇 |
2004年 | 14篇 |
2003年 | 34篇 |
2002年 | 52篇 |
2001年 | 32篇 |
2000年 | 27篇 |
1999年 | 23篇 |
1998年 | 16篇 |
1997年 | 16篇 |
1996年 | 14篇 |
1995年 | 13篇 |
1994年 | 10篇 |
1993年 | 6篇 |
1992年 | 3篇 |
1991年 | 8篇 |
1990年 | 4篇 |
1989年 | 3篇 |
1988年 | 6篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有606条查询结果,搜索用时 15 毫秒
551.
形状记忆合金超弹性阻尼性能的试验研究 总被引:6,自引:3,他引:6
本文分析了形状记忆合金(SMA)超弹性阻尼减振的机理,通过试验研究了温度、加载频率、循环次数及预变形等因素对SMA超弹性阻尼的影响。研究结果表明,利用SMA的超弹性阻尼特性可以研制出性能良好的耗能减振装置,在工程结构振动控制方面具有比较好的应用前景。 相似文献
552.
反演地震断层破裂过程是研究地震震源性质的一条重要途径.本研究中,我们选择了两个具有相近发震时间和地点的台湾地震,使用全球数字地震台网的宽频带和长周期记录以及自适应混合全局反演算法,反演了断层平面上的滑动振幅、倾伏角、上升时间和破裂时间,并对两次事件进行了对比.对每一子断层滑动率的计算,提供了断层面上应力和强度的有关信息.前一个地震(面波震级MS=6.0),最大滑动振幅2.4 m和最小上升时间1.2 s都位于震中;后一个地震(MS=6.6)由两个子事件组成,第2个子事件有4 s的延迟.位于震中附近的最大滑动振幅0.9 m对应最小上升时间1.4 s.相应最大滑动率值0.7 m/s,与其它大滑动率区域的峰值相近.我们认为,后一个地震比前一个地震有更复杂的时空分布. 相似文献
553.
为探讨长英质岩浆作用过程中金属成矿元素的地球化学行为及其成矿意义,我们进行了常压下花岗岩-KBF3-Na2MoO4-WO3体系的实验研究。结果表明,高温(1250℃)条件下呈均一状态的花岗岩-KBF4-NaMoO4-WO3体系,当温度降低时发生液态不混溶,从中分离出含矿熔体的小液滴,体系中的Mo(W)几乎全部富集在这种小液滴中。含矿熔体中极富含Ca、Mg和P,而贫Si、Al和K,H2O和F富集在含矿熔体中。此实验结果表明:长英质岩浆中液态不混溶作用的发生可以使成矿元素W和Mo富集到与硅酸盐熔体不混溶的独立的非硅酸盐熔体中。这种熔体在适当的地质条件下继续演化可形成类似镁铁质岩浆演化过程中常出现的岩浆熔离型矿床。本实验结果可能为斑岩矿床的形成机理提供一种新的解释。 相似文献
554.
555.
Yang Ai 《Contributions to Mineralogy and Petrology》1994,115(4):467-473
A comprehensive experimental dataset was used to analyse the compositional dependence of the garnet-clinopyroxene Fe2+/Mg partition coefficient (K
d). The Mg no. of garnet was found to have a significant effect on the K
d, in addition to calcium content of garnet. An empirical model was developed to relate these effects with equilibrium temperature and pressure in the form of a conventional geothermometer, T(K) = { – 1629[XGt
Ca]2 + 3648.55[XGt
Ca] – 6.59[Mg no. (Gt)] + 1987.98 + 17.66P (kbar)}/(In kd + 1.076). Application of this thermometer produced reasonable temperature estimates for rocks from the lower crust (garnet amphibolites, granulites and eclogites) and the upper mantle (eclogite and lherzolite xenoliths in kimberlites, mineral inclusions in diamonds). 相似文献
556.
557.
558.
559.
Distribution, partitioning and fluxes of dissolved and particulate organic C, N and P in the eastern North Pacific and Southern Oceans 总被引:1,自引:0,他引:1
Ai Ning Loh James E. Bauer 《Deep Sea Research Part I: Oceanographic Research Papers》2000,47(12):2287-2316
Concurrent distributions of dissolved and suspended particulate organic carbon (DOC and POCsusp), nitrogen (DON and PONsusp) and phosphorus (DOP and POPsusp), and of suspended particulate inorganic phosphorus (PIPsusp), are presented for the open ocean water column. Samples were collected along a three-station transect from the upper continental slope to the abyssal plain in the eastern North Pacific and from a single station in the Southern Ocean. The elemental composition of surface sedimentary organic matter (SOM) was also measured at each location, and sinking particulate organic matter (POMsink) was measured with moored sediment traps over a 110-d period at the abyssal site in the eastern North Pacific only. In addition to elemental compositions, C : N, C : P and N : P ratios were also calculated. Surface and deep ocean concentrations of dissolved organic matter (DOM) and inorganic nutrients between the two sites displayed distinct differences, although suspended POM (POMsusp) concentrations were similar. Concentrations of DOM and POMsusp displayed unique C, N and P distributions, with POMsusp concentrations generally about 1–2 orders of magnitude less than the corresponding DOM concentrations. These differences were likely influenced by different biogeochemical factors: whereas the dissolved constituents may have been influenced more by the physical regime of the study site, suspended particulate matter may have been controlled to a greater extent by biological and chemical alteration. Up to 80% of total particulate P in POMsusp, POMsink and SOM consisted of PIP. For all organic matter pools measured, elemental ratios reveal that organic P is preferentially remineralized over organic C and organic N at both sites. Increases in C : P and N : P ratios with depth were also observed for DOM at both sites, suggesting that DOP is also preferentially degraded over C and N as a function of depth. A simple one-dimensional vertical eddy diffusion model was applied to estimate the contributions of dissolved and suspended particulate organic C, N and P fluxes from the upper mixed layer into the permanent thermocline. Estimated vertical DOM fluxes were 28–63% of the total organic matter fluxes; POMsusp and POMsink fluxes were 8–20 and 28–52% of the total. 相似文献
560.
阐述了建立物质本构关系时应满足的基本公理,较详细地推导了各种类型粘弹性物质的本构关系,论述了变率理论与泛函数论之间的关系,推导了对于粘弹性问题求解具有实用意义的对应定理,并以简单的例子说明对应定理的应用。 相似文献