全文获取类型
收费全文 | 27525篇 |
免费 | 720篇 |
国内免费 | 1593篇 |
专业分类
测绘学 | 1542篇 |
大气科学 | 2638篇 |
地球物理 | 5182篇 |
地质学 | 13297篇 |
海洋学 | 1416篇 |
天文学 | 1796篇 |
综合类 | 2441篇 |
自然地理 | 1526篇 |
出版年
2024年 | 16篇 |
2023年 | 68篇 |
2022年 | 167篇 |
2021年 | 183篇 |
2020年 | 123篇 |
2019年 | 135篇 |
2018年 | 4865篇 |
2017年 | 4144篇 |
2016年 | 2720篇 |
2015年 | 382篇 |
2014年 | 290篇 |
2013年 | 203篇 |
2012年 | 1147篇 |
2011年 | 2885篇 |
2010年 | 2206篇 |
2009年 | 2480篇 |
2008年 | 2028篇 |
2007年 | 2486篇 |
2006年 | 153篇 |
2005年 | 284篇 |
2004年 | 451篇 |
2003年 | 488篇 |
2002年 | 328篇 |
2001年 | 139篇 |
2000年 | 155篇 |
1999年 | 169篇 |
1998年 | 136篇 |
1997年 | 140篇 |
1996年 | 129篇 |
1995年 | 113篇 |
1994年 | 105篇 |
1993年 | 84篇 |
1992年 | 76篇 |
1991年 | 62篇 |
1990年 | 51篇 |
1989年 | 44篇 |
1988年 | 41篇 |
1987年 | 13篇 |
1986年 | 25篇 |
1985年 | 16篇 |
1984年 | 11篇 |
1983年 | 16篇 |
1982年 | 8篇 |
1981年 | 31篇 |
1980年 | 26篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 7篇 |
1975年 | 2篇 |
1958年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
岩浆流体对冲绳海槽海底成矿热水系统的可能贡献 总被引:20,自引:1,他引:20
海底火山活动区成矿热液流体来源长期存在争议,尽管海水来源说更为流行,但本文提供的下列证据表明,来自长曲质岩浆的流体对冲绳海槽现代活动热水成矿系统有较大贡献:(1)冲绳海槽JADE热水区出现异常高热流,其下方1 ̄2km处存在浅位长英质岩浆房;(2)CO2、烃类、H2等气体在热水成矿体系中极度富集甚至形成独立气流,与热水流体共存。气体的碳、氦同位素资料表明其来自长英质岩浆本系;(3)JADE成矿热水系 相似文献
82.
Characteristics of dry-wet abrupt alternation events in the middle and lower reaches of the Yangtze River Basin and the relationship with ENSO 总被引:1,自引:0,他引:1
During recent decades, more frequent flood-drought alternations have been seen in China as a result of global climate change and intensive human activities, which have significant implications on water and food security. To better identify the characteristics of flood-drought alternations, we proposed a modified dry-wet abrupt alternation index (DWAAI) and applied the new method in the middle and lower reaches of the Yangtze River Basin (YRB-ML) to analyze the long-term spatio-temporal characteristics of dry-wet abrupt alternation (DWAA) events based on the daily precipitation observations at 75 rainfall stations in summer from 1960 to 2015. We found that the DWAA events have been spreading in the study area with higher frequency and intensity since 1960. In particular, the DWAA events mainly occurred in May and June in the northwest of the YRB-ML, including Hanjiang River Basin, the middle reaches of the YRB, north of Dongting Lake and northwest of Poyang Lake. In addition, we also analyzed the impact of El Niño Southern Oscillation (ENSO) on DWAA events in the YRB-ML. The results showed that around 41.04% of DWAA events occurred during the declining stages of La Niña or within the subsequent 8 months after La Niña, which implies that La Niña events could be predictive signals of DWAA events. Besides, significant negative correlations have been found between the modified DWAAI values of all the rainfall stations and the sea surface temperature anomalies in the Nino3.4 region within the 6 months prior to the DWAA events, particularly for the Poyang Lake watershed and the middle reaches of the YRB. This study has significant implications on the flood and drought control and water resources management in the YRB-ML under the challenge of future climate change. 相似文献
83.
中国东部植被NDVI对气温和降水的时空响应(英文) 总被引:4,自引:4,他引:4
Temporal and spatial response characteristics of vegetation NDVI to the variation of temperature and precipitation in the whole year,spring,summer and autumn was analyzed from April 1998 to March 2008 based on the SPOT VGT-NDVI data and daily temperature and precipitation data from 205 meteorological stations in eastern China.The results indicate that as a whole,the response of vegetation NDVI to the variation of temperature is more pronounced than that of precipitation in eastern China.Vegetation NDVI maxi... 相似文献
84.
我国地球物理监测站网主要由GNSS、定点形变、重力、地电、地磁、地下流体六大观测站网组成,由国家站、省级站和市县站构成基本监测单元。市县站观测手段多、站点数量庞大,是地球物理监测站网的重要组成部分。为摸清市县站监测资源底数、统筹利用市县监测数据,中国地震局历时2年完成了我国市县地震监测资源评估工作。基于此项工作,本文从观测环境、观测系统、数据质量和预报应用四个方面对我国市县地球物理监测资源进行简要分析,评估结果显示: 37.8%的测项评估为合格,可直接纳入国家地球物理数据库管理,47.9%的测项评估为基本合格,可纳入国家市县数据库管理,14.3%的测项评估为不合格,需要停测或者优化改造。针对评估结果,简要分析了市县监测运维工作存在的主要问题并提出具体可行的解决建议,为提升市县站监测质量提供参考。 相似文献
85.
86.
西藏地堡那木岗矿区水系沉积物地球化学特征及找矿预测 总被引:1,自引:0,他引:1
利用SPSS等软件对矿区1:5万水系沉积物地球化学数据分析,选用平均值±3倍标准差(X±3S)作为上下限反复剔除原始数据的特值,使元素含量服从正态分布.最后以X+2S作为异常下限(T),以1T、2T、4T三级浓度分带,圈定Cu、Au、Ag、Mo单元素异常和Au-Ag-Mo综合元素异常,揭示矿区内水系沉积物地球化学异常特征.将异常区与矿区地质特征、矿床(点)套合分析,表明异常受地层、断裂、围岩蚀变控制,对寻找矿(化)体、断层、围岩蚀变带有指示作用.最终,优选2处远景区,分别为3号综合异常区中心北北西方向至北东向断裂附近,1号、2号综合异常区及其东侧组成一个走向为东西向的异常带. 相似文献
87.
改进的能量守恒方法及其在CHAMP重力场恢复中的应用 总被引:1,自引:0,他引:1
XU Tianhe HE Kaifei Xi’an Research Institute of Surveying Mapping Middle Yanta Road Xi’an China. 《地球空间信息科学学报》2008,11(3):168-173
An efficient method for gravity field determination from CHAMP orbits and accelerometer data is referred to as the energy balance approach. A new CHAMP gravity field recovery strategy based on the improved energy balance approach IS developed in this paper. The method simultaneously solves the spherical harmonic coefficients, daily Integration constant, scale and bias parameters. Two 60 degree and order gravitational potential models, XISM-CHAMPO1S from the classical energy balance approach, and XISM-CHAMPO2S from the improved energy balance, are determined using about one year's worth of CHAMP kinematic orbits from TUM and accelerometer data from GFZ. Comparisons among XISM-CHAMPO1S, XISM-CHAMPO2S, EIGEN-CGO3C, EIGEN-CHAMPO3S, EIGEN2, ENIGNIS and EGM96 are made. The results show that the XISM-CHAMPO2S model is more accurate than EGM96, EIGENIS, EIGEN2 and XISM-CHAMPO1S at the same degree and order, and has almost the same accuracy as EIGEN-CHAMPO3S. 相似文献
88.
基于交互多模型的水下目标跟踪方法 总被引:1,自引:0,他引:1
According to the requirements of real-time performance and reliability in underwater maneuvering target tracking as well as clarifying motion features of the underwater target, an interacting multiple model algorithm based on fuzzy logic inference (FIMM) is proposed. Maneuvering patterns of the target are represented by model sets, including the constant velocity model (CA), the Singer mode~, and the nearly constant speed horizontal-turn model (HT) in FIMM technology. The simulation results show that compared to conventional IMM, the reliability and real-time performance of underwater target tracking can be improved by FIMM algorithm. 相似文献
89.
Building damage in Dujiangyan during Wenchuan Earthquake 总被引:2,自引:1,他引:1
A field damage survey of 1,005 buildings damaged by the Wenchuan Earthquake in Dujiangyan City was carried out and the resulting data was analyzed using the statistical method. It is shown that buildings that were seismically designed achieved the desired seismic fortification target; they sustained less damage than the non-seismically designed buildings. Among the seismically designed buildings investigated, RC frame buildings performed the best in terms of seismic resistance. Masonry buildings with a ground story of RC frame structure were the second best, and masonry buildings performed the worst. Considering building height, multistory buildings sustained more severe damage than high-rise buildings and 2- and 3-story buildings. Compared to residential buildings, public buildings, such as schools and hospitals, suffered more severe damage. 相似文献
90.
Simulating the effect of hydrate dissociation on wellhead stability during oil and gas development in deepwater 总被引:1,自引:0,他引:1
It is well known that methane hydrate has been identified as an alternative resource due to its massive reserves and clean property. However, hydrate dissociation during oil and gas development (OGD) process in deep water can affect the stability of subsea equipment and formation. Currently, there is a serious lack of studies over quantitative assessment on the effects of hydrate dissociation on wellhead stability. In order to solve this problem, ABAQUS finite element software was used to develop a model and to evaluate the behavior of wellhead caused by hydrate dissociation. The factors that affect the wellhead stability include dissociation range, depth of hydrate formation and mechanical properties of dissociated hydrate region. Based on these, series of simulations were carried out to determine the wellhead displacement. The results revealed that, continuous dissociation of hydrate in homogeneous and isotropic formations can causes the non-linear increment in vertical displacement of wellhead. The displacement of wellhead showed good agreement with the settlement of overlying formations under the same conditions. In addition, the shallower and thicker hydrate formation can aggravate the influence of hydrate dissociation on the wellhead stability. Further, it was observed that with the declining elastic modulus and Poisson’s ratio, the wellhead displacement increases. Hence, these findings not only confirm the effect of hydrate dissociation on the wellhead stability, but also lend support to the actions, such as cooling the drilling fluid, which can reduce the hydrate dissociation range and further make deepwater operations safer and more efficient. 相似文献