全文获取类型
收费全文 | 1632篇 |
免费 | 282篇 |
国内免费 | 351篇 |
专业分类
测绘学 | 232篇 |
大气科学 | 324篇 |
地球物理 | 347篇 |
地质学 | 757篇 |
海洋学 | 193篇 |
天文学 | 65篇 |
综合类 | 170篇 |
自然地理 | 177篇 |
出版年
2024年 | 11篇 |
2023年 | 43篇 |
2022年 | 78篇 |
2021年 | 108篇 |
2020年 | 78篇 |
2019年 | 79篇 |
2018年 | 100篇 |
2017年 | 92篇 |
2016年 | 92篇 |
2015年 | 82篇 |
2014年 | 87篇 |
2013年 | 102篇 |
2012年 | 80篇 |
2011年 | 89篇 |
2010年 | 80篇 |
2009年 | 65篇 |
2008年 | 65篇 |
2007年 | 66篇 |
2006年 | 66篇 |
2005年 | 62篇 |
2004年 | 45篇 |
2003年 | 36篇 |
2002年 | 54篇 |
2001年 | 50篇 |
2000年 | 47篇 |
1999年 | 83篇 |
1998年 | 70篇 |
1997年 | 78篇 |
1996年 | 54篇 |
1995年 | 31篇 |
1994年 | 26篇 |
1993年 | 41篇 |
1992年 | 29篇 |
1991年 | 25篇 |
1990年 | 11篇 |
1989年 | 14篇 |
1988年 | 5篇 |
1987年 | 10篇 |
1986年 | 10篇 |
1985年 | 2篇 |
1984年 | 5篇 |
1983年 | 3篇 |
1982年 | 1篇 |
1981年 | 5篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1958年 | 2篇 |
排序方式: 共有2265条查询结果,搜索用时 15 毫秒
231.
The hydrochemical composition of surface water and groundwater is a key parameter for understanding the evolution of water and its quality.In particular, little is known about the impact of transferred water on surface water and groundwater.In this study, Baiyangdian Lake was selected as a typical area for extensive groundwater exploration and surface water transfer in the North China Plain.Surface water and groundwater samples were sampled in dry/wet seasons and then analyzed before/after the water transfer, respectively.Generally, surface water and groundwater are extensively hydrologically connected based on hydrochemical evidence.It was found that the hydrochemical composition of the shallow groundwater is affected by the surface water and that the water quality of the deep groundwater is stable.However, inter-aquifer recharge processes from the shallow groundwater to the deep groundwater existed in the anthropogenic region impacted with high nitrate-ion concentrations.Also, the hydrochemical composition of the surface water and groundwater was dominated by rock-weathering and evaporation-precipitation processes.Due to the existence of the deep vadose zone in the alluvial fan, Na~+was exchanged into soil matrices during the leakage of the surface water.In addition, the transferred water resulted in surface water with good quality, and it also played as an important recharge source to groundwater.As the most important water resource for irrigation and drinking, deep groundwater should be paid more attention in the alluvial fan with frequent water transfer and extensive groundwater exploration. 相似文献
232.
233.
234.
GPS Solutions - Carrier phase ambiguity resolution over long baselines is challenging in BDS data processing. This is partially due to the variations of the hardware biases in BDS code signals and... 相似文献
235.
236.
对东风盐场9个站位卤水中由藻类植物产生的可溶性糖浓度的变化规律及其与海盐产量和质量之间的关系进行了研究。结果表明,各站位可溶性糖含量的变化范围为0.7-124.3mg/L,以6月份最高,2月份最低;卤水中可溶性糖在111mg/L-215mg/L范围内,结晶盐的产量随卤水中可溶性糖含量的增加而提高,但同时降低了NaCl的含量,并增加了可溶性杂质及水分的含量,从而降低了盐质。初始可溶性糖浓度为111mg/L、137mg/L、160mg/L、193mg/L和215mg/L的25.4°Be’的卤水,在日照下实验12天,其对应结晶盐的NaCl含量分别为91.66%、90.63%、90.48%、90.23%和88.46%,可溶性杂质的含量分别为3.05%、3.32%、3.33%和4.54%。 相似文献
237.
238.
Xiaopeng Gong Shengfeng Gu Yidong Lou Fu Zheng Maorong Ge Jingnan Liu 《Journal of Geodesy》2018,92(7):797-809
Global navigation satellite systems (GNSS) are acting as an indispensable tool for geodetic research and global monitoring of the Earth, and they have been rapidly developed over the past few years with abundant GNSS networks, modern constellations, and significant improvement in mathematic models of data processing. However, due to the increasing number of satellites and stations, the computational efficiency becomes a key issue and it could hamper the further development of GNSS applications. In this contribution, this problem is overcome from the aspects of both dense linear algebra algorithms and GNSS processing strategy. First, in order to fully explore the power of modern microprocessors, the square root information filter solution based on the blocked QR factorization employing as many matrix–matrix operations as possible is introduced. In addition, the algorithm complexity of GNSS data processing is further decreased by centralizing the carrier-phase observations and ambiguity parameters, as well as performing the real-time ambiguity resolution and elimination. Based on the QR factorization of the simulated matrix, we can conclude that compared to unblocked QR factorization, the blocked QR factorization can greatly improve processing efficiency with a magnitude of nearly two orders on a personal computer with four 3.30 GHz cores. Then, with 82 globally distributed stations, the processing efficiency is further validated in multi-GNSS (GPS/BDS/Galileo) satellite clock estimation. The results suggest that it will take about 31.38 s per epoch for the unblocked method. While, without any loss of accuracy, it only takes 0.50 and 0.31 s for our new algorithm per epoch for float and fixed clock solutions, respectively. 相似文献
239.
Lin Zhu Ren-Xu Chen Yong-Fei Zheng Jing Wang Bing Gong 《Geostandards and Geoanalytical Research》2023,47(1):105-124
An accurate determination of water content in garnet is critical to quantify the transport of water to the deep mantle by the subducted oceanic crust beyond the breakdown of hydrous phases. Fourier transform infrared spectroscopy (FTIR) is the most widely used approach to determine the species and contents of water in garnet. Accurate quantification of OH in garnet requires independent calibration using an external method, as OH absorbance is mineral and composition specific. To obtain the infrared absorption coefficients of structural hydroxyl in garnet, a combined study of spectrometric analyses by FTIR and a method combining a thermal conversion elemental analyser with isotope ratio mass spectrometry (TC/EA-MS) was carried out for fourteen gem-quality natural garnet crystals with variable compositions. The obtained molar absorption coefficients were 9322 ± 338 and 240 ± 26 l mol−1 cm−2 for grossular- and spessartine-rich garnet and pyrope-almandine garnet, respectively. These results are within the range of previous studies. A new molar absorption coefficient of 689 ± 177 l mol−1 cm−2 was obtained for pyrope-spessartine garnet. The large variation in the absorption coefficient indicates it is controlled by both garnet composition and OH-absorption bands. The obtained absorption coefficients are only appropriate for certain types of eclogitic garnet, and more studies should be carried out on eclogitic garnets. 相似文献
240.
Li Ze Li Gao Yu Hao He Long Jiang Zujun Li Hongzhi Gong Hanbo 《Mathematical Geosciences》2022,54(6):1069-1096
Mathematical Geosciences - Quantitative evaluation of fracability is essential for hydraulic fracturing design, with the distribution of in situ stress being a key parameter. This study focused on... 相似文献