全文获取类型
收费全文 | 13961篇 |
免费 | 3287篇 |
国内免费 | 2400篇 |
专业分类
测绘学 | 914篇 |
大气科学 | 1660篇 |
地球物理 | 8147篇 |
地质学 | 5552篇 |
海洋学 | 1077篇 |
天文学 | 197篇 |
综合类 | 763篇 |
自然地理 | 1338篇 |
出版年
2024年 | 38篇 |
2023年 | 148篇 |
2022年 | 378篇 |
2021年 | 528篇 |
2020年 | 536篇 |
2019年 | 692篇 |
2018年 | 556篇 |
2017年 | 548篇 |
2016年 | 545篇 |
2015年 | 630篇 |
2014年 | 786篇 |
2013年 | 819篇 |
2012年 | 893篇 |
2011年 | 898篇 |
2010年 | 735篇 |
2009年 | 853篇 |
2008年 | 850篇 |
2007年 | 1023篇 |
2006年 | 1050篇 |
2005年 | 906篇 |
2004年 | 871篇 |
2003年 | 762篇 |
2002年 | 625篇 |
2001年 | 490篇 |
2000年 | 511篇 |
1999年 | 436篇 |
1998年 | 435篇 |
1997年 | 364篇 |
1996年 | 391篇 |
1995年 | 276篇 |
1994年 | 262篇 |
1993年 | 230篇 |
1992年 | 148篇 |
1991年 | 97篇 |
1990年 | 70篇 |
1989年 | 72篇 |
1988年 | 67篇 |
1987年 | 40篇 |
1986年 | 31篇 |
1985年 | 10篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1982年 | 2篇 |
1981年 | 5篇 |
1980年 | 4篇 |
1979年 | 16篇 |
1971年 | 1篇 |
1954年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
221.
222.
As shown in comparison and study of the HIRS-Tb12 data and conventional data, temperature,
humidity and vertical motion are structured differently in the Southern and Northern Hemispheres, which are well
depicted with the HIRS-Tb12 data. When high pressures rapidly decrease over the regions of South China Sea
and Arabian Sea with the HIRS-Tb12 less than 200 W/m2, monsoons will set off in the South China Sea, Arabian
Sea and Bay of Bengal, respectively. From a year of significant drought to one of significant floods, the trend of
evolution is significantly different in the downdraft areas of the subtropical highs between the two hemispheres. 相似文献
223.
224.
The electrical aerosol spectrometer (EAS) of the parallel measuring principle at Tartu University is an efficient instrument for rapid measurement of the unstable size spectrum of aerosol particles. The measuring range from 10 nm to 10 μm is achieved by simultaneously using a pair of differential mobility analyzers with two different particle chargers. The particle spectrum is calculated and measurement errors are estimated in real time by using a least-squares method. Experimental calibration ensures reliability of measurement. The instrument is well suited for continuous monitoring of atmospheric aerosol. 相似文献
225.
226.
新疆西天山高硫化型京希-伊尔曼德金矿床的识别标志及其找矿意义 总被引:3,自引:0,他引:3
经过详细的野外地质勘查、热液蚀变及蚀变矿物学研究,流体包裹体和同位素研究,首次将西天山京希-伊尔曼德金矿床确定为高硫化型浅成低温热液金矿床。该矿床的主要识别标志为:发育以多孔状石英为特征的硅化蚀变带和高级泥化蚀变带;成矿流体性质为低盐度[W(NaCl)为0.3-4.2%]、低pH值(3-4)和高氧化态;氧同位素δ(^18O)为1.7 ‰-4.3‰,δ(D)为-60‰--80‰。金主要富集在高级泥化带和中心硅化蚀变带内。系统研究和总结了成矿地质-地球化学制约因素以及区域、靶区和勘探区尺度的找矿标志。 相似文献
227.
An analytical model for high damping elastomeric isolation bearings is presented in this paper. The model is used to describe mathematically the damping force and restoring force of the rubber material and bearing. Ten parameters to be identified from cyclic loading tests are included in the model. The sensitivity of the ten parameters in affecting the model is examined. These ten parameters are functions of a number of influence factors on the elastomer such as the rubber compound, Mullins effect, scragging effect, frequency, temperature and axial load. In this study, however, only the Mullins effect, scragging effect, frequency and temperature are investigated. Both material tests and shaking table tests were performed to validate the proposed model. Based on the comparison between the experimental and the analytical results, it is found that the proposed analytical model is capable of predicting the shear force–displacement hysteresis very accurately for both rubber material and bearing under cyclic loading reversals. The seismic response time histories of the bearing can also be captured, using the proposed analytical model, with a practically acceptable precision. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
228.
The response of low‐ductility reinforced concrete (RC) frames, designed typically for a non‐seismic region, subjected to two frequencies of base excitations is studied. Five half‐scaled, two‐bay, two‐storey, RC frames, each approximately 5 m wide by 3.3 m high, were subjected to both horizontal and/or vertical base excitations with a frequency of 40 Hz as well as a lower frequency of about 4 Hz (close to the fundamental frequency) using a shake table. The imposed acceleration amplitude ranged from 0.2 to 1.2g. The test results showed that the response characteristics of the structures differed under high‐ and low‐frequency excitations. The frames were able to sustain high‐frequency excitations without damage but were inadequate for low‐frequency excitations, even though the frames exhibited some ductility. Linear‐elastic time‐history analysis can predict reasonably well the structural response under high‐frequency excitations. As the frames were not designed for seismic loads, the reinforcement detailing may not have been adequate, based on the crack pattern observed. The effect of vertical excitation can cause significant additional forces in the columns and moment reversals in the beams. The ‘strong‐column, weak‐beam’ approach for lateral load RC frame design is supported by experimental observations. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
229.
The paper presents a numerical investigation aimed at evaluating the improvements achievable through devices for passive seismic protection of buildings based on the use of shape memory alloys (SMA) in place of conventional steel or rubber devices. To get some generality in the results, different resisting reinforced concrete plane frames were analysed, either protected or not. ‘New’ and ‘existing’ buildings were considered depending on whether seismic provisions are adopted in the building design or not. Base isolation and energy dissipation were equally addressed for both conventional and innovative SMA‐based devices. Fragility analyses were performed using specific damage measures to account for comparisons among different damage types; the results were then used to estimate quantitatively the effectiveness of the various protection systems. More specifically, the assessment involved a direct comparison of the damage reduction provided by each protection system with respect to the severe degradation experienced by the corresponding non‐protected frame. Structural damage, non‐structural damage and damage to contents were used on purpose and included in a subsequent phase of cost analysis to evaluate the expected gains also in terms of economic benefits and life loss prevention. The results indicate that base isolation, when applicable, provides higher degrees of safety than energy dissipation does; moreover, the use of SMA‐based devices generally brings about better performances, also in consideration of the reduced functional and maintenance requirements. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
230.
The seismic response of single‐degree‐of‐freedom (SDOF) systems incorporating flag‐shaped hysteretic structural behaviour, with self‐centring capability, is investigated numerically. For a SDOF system with a given initial period and strength level, the flag‐shaped hysteretic behaviour is fully defined by a post‐yielding stiffness parameter and an energy‐dissipation parameter. A comprehensive parametric study was conducted to determine the influence of these parameters on SDOF structural response, in terms of displacement ductility, absolute acceleration and absorbed energy. This parametric study was conducted using an ensemble of 20 historical earthquake records corresponding to ordinary ground motions having a probability of exceedence of 10% in 50 years, in California. The responses of the flag‐shaped hysteretic SDOF systems are compared against the responses of similar bilinear elasto‐plastic hysteretic SDOF systems. In this study the elasto‐plastic hysteretic SDOF systems are assigned parameters representative of steel moment resisting frames (MRFs) with post‐Northridge welded beam‐to‐column connections. In turn, the flag‐shaped hysteretic SDOF systems are representative of steel MRFs with newly proposed post‐tensioned energy‐dissipating connections. Building structures with initial periods ranging from 0.1 to 2.0s and having various strength levels are considered. It is shown that a flag‐shaped hysteretic SDOF system of equal or lesser strength can always be found to match or better the response of an elasto‐plastic hysteretic SDOF system in terms of displacement ductility and without incurring any residual drift from the seismic event. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献