全文获取类型
收费全文 | 6429篇 |
免费 | 1046篇 |
国内免费 | 1174篇 |
专业分类
测绘学 | 2249篇 |
大气科学 | 645篇 |
地球物理 | 1188篇 |
地质学 | 2705篇 |
海洋学 | 626篇 |
天文学 | 345篇 |
综合类 | 460篇 |
自然地理 | 431篇 |
出版年
2024年 | 21篇 |
2023年 | 59篇 |
2022年 | 229篇 |
2021年 | 285篇 |
2020年 | 302篇 |
2019年 | 316篇 |
2018年 | 234篇 |
2017年 | 368篇 |
2016年 | 350篇 |
2015年 | 341篇 |
2014年 | 433篇 |
2013年 | 486篇 |
2012年 | 467篇 |
2011年 | 466篇 |
2010年 | 364篇 |
2009年 | 416篇 |
2008年 | 475篇 |
2007年 | 404篇 |
2006年 | 439篇 |
2005年 | 408篇 |
2004年 | 324篇 |
2003年 | 230篇 |
2002年 | 249篇 |
2001年 | 163篇 |
2000年 | 135篇 |
1999年 | 125篇 |
1998年 | 113篇 |
1997年 | 82篇 |
1996年 | 56篇 |
1995年 | 58篇 |
1994年 | 57篇 |
1993年 | 52篇 |
1992年 | 41篇 |
1991年 | 25篇 |
1990年 | 25篇 |
1989年 | 10篇 |
1988年 | 14篇 |
1987年 | 6篇 |
1986年 | 6篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1954年 | 3篇 |
排序方式: 共有8649条查询结果,搜索用时 31 毫秒
501.
502.
R. N. Colvile T. W. Choularton J. N. Cape B. J. Bandy K. N. Bower R. A. Burgess T. J. Davies G. J. Dollard M. W. Gallagher K. J. Hargreaves B. M. R. Jones S. A. Penkett R. L. Storeton-West 《Journal of Atmospheric Chemistry》1996,24(3):211-239
Four case studies are described, from a three-site field experiment in October/November 1991 using the Great Dun Fell flow-through reactor hill cap cloud in rural Northern England. Measurements of total odd-nitrogen nitrogen oxides (NO
y
) made on either side of the hill, before and after the air flowed through the cloud, showed that 10 to 50% of the NO
y
, called NO
z
, was neither NO nor NO2. This NO
z
failed to exhibit a diurnal variation and was often higher after passage through cloud than before. No evidence of conversion of NO
z
to NO3
- in cloud was found. A simple box model of gas-phase chemistry in air before it reached the cloud, including scavenging of NO3 and N2O5 by aerosol of surface area proportional to the NO2 mixing ratio, shows that NO3 and N2O5 may build up in the boundary layer by night only if stable stratification insulates the air from emissions of NO. This may explain the lack of evidence for N2O5 forming NO3
- in cloud under well-mixed conditions in 1991, in contrast with observations under stably stratified conditions during previous experiments when evidence of N2O5 was found. Inside the cloud, some variations in the calculated total atmospheric loading of HNO2 and the cloud liquid water content were related to each other. Also, indications of conversion of NO
x
to NO
z
were found. To explain these observations, scavenging of NO
x
and HNO2 by cloud droplets and/or aqueous-phase oxidation of NO2
- by nitrate radicals are considered. When cloud acidity was being produced by aqueous-phase oxidation of NO
x
or SO2, NO3
- which had entered the cloud as aerosol particles was liberated as HNO3 vapour. When no aqueous-phase production of acidity was occurring, the reverse, conversion of scavenged HNO3 to particulate NO3
-, was observed. 相似文献
503.
中低纬地区地磁脉动的研究 总被引:1,自引:0,他引:1
杨少峰 《地震地磁观测与研究》1992,13(1):50-57
近年来我们对中低纬地区地磁脉动进行了大量的观测和研究。本文不仅介绍了观测仪器的设计、台网设置及数据处理方法。而且还简要地介绍了一些主要科研成果,如低纬Pc3脉动特点,低纬Pi2脉动偏振特性。南极地区的地磁脉动观测结果,以及在磁暴和太阳耀斑期间在低纬地区观测的地磁脉动。这对于进一步认识中低纬地区地磁脉动是十分有益的。 相似文献
504.
505.
A. Veldkamp 《地球表面变化过程与地形》1992,17(5):487-500
The combined effects of climate and tectonism on general terrace stratigraphy and valley asymmetry during the last half million years in the Allier system (France) are simulated by a 3-D conceptual model (LIMTER). This model allows the formulation and evaluation of long term terrace formation scenarios for the Allier system. Simulation results suggest that terrace stratigraphy in the study area is mainly the result of internal dynamics and climatic change. Local tectonism contributed to the development of unpaired terraces while the general regional uplift played a dominant role in determining terrace formation and preservation in general. 相似文献
506.
The quantitative probabilistic assessment of the undiscovered mineral resources of the 17.1-million-acre Tongass National Forest (the largest in the United States) and its adjacent lands is a nonaggregated, mineral-resource-tract-oriented assessment designed for land-planning purposes. As such, it includes the renewed use of gross-in-place values (GIPV's) in dollars of the estimated amounts of metal contained in the undiscovered resources as a measure for land-use planning.Southeastern Alaska is geologically complex and contains a wide variety of known mineral deposits, some of which have produced important amounts of metals during the past 100 years. Regional geological, economic geological, geochemical, geophysical, and mineral exploration history information for the region was integrated to define 124 tracts likely to contain undiscovered mineral resources. Some tracts were judged to contain more than one type of mineral deposit. Each type of deposit may contain one or more metallic elements of economic interest. For tracts where information was sufficient, the minimum number of as-yet-undiscovered deposits of each type was estimated at probability levels of 0.95, 0.90, 0.50, 0.10, and 0.05.The undiscovered mineral resources of the individual tracts were estimated using the U.S. Geological Survey's MARK3 mineral-resource endowment simulator; those estimates were used to calculate GIPV's for the individual tracts. Those GIPV's were aggregated to estimate the value of the undiscovered mineral resources of southeastern Alaska. The aggregated GIPV of the estimates is $40.9 billion.Analysis of this study indicates that (1) there is only a crude positive correlation between the size of individual tracts and their mean GIPV's: and (2) the number of mineral-deposit types in a tract does not dominate the GIPV's of the tracts, but the inferred presence of synorogenic-synvolcanic nickel-copper, porphyry copper skarn-related, iron skarn, and porphyry copper-molybdenum deposits does. The influence of this study on the U.S. Forest Service planning process is yet to be determined. 相似文献
507.
2D Coupled 3D:A New Numerical Model forDual-Structured-Aquifer System¥ChenChongxi;FangShuzhen;LinMin(FacultyofEnvironmentalSc... 相似文献
508.
黄卫祖 《吉林大学学报(地球科学版)》1993,(1)
分别论述了在空间域与频率域中由重力资料反演三维密度分布的理论及其实现的方法,并提出了一种简便、实用的频率域三维密度反演算法。 相似文献
509.
3D地震数据不规则采样缺失重建是地震勘探数据处理流程中的重要问题.本文提出了一种基于具有保幅特性的非均匀高阶抛物Radon变换(NHOPRT)地震数据重建方法.在最小二乘反演方程中引入Delaunay三角网格剖分来计算空间不规则加权系数,从而获得最接近完整规则数据的高阶抛物Radon变换域系数.在用SVD求解反演方程过程中,利用高阶抛物Radon变换算子在频率域为指数函数,具有线性可分解特性,将二维空间的高阶抛物Radon变换算子分解为两个独立的一维空间变换算子,减小了变换算子的矩阵大小,从而很大程度地提高了计算效率.理论模型和实际地震数据重建测试证明了本文方法的有效性以及实用性. 相似文献
510.
ABSTRACT In this paper, we propose a method to regenerate Rational Polynomial Coefficients (RPCs) using KOMPSAT-3A imagery and to reduce the geolocation error using minimum ground control points (GCPs). To estimate the new RPCs, the physical sensor model fitted to KOMPSAT-3A imagery was utilized and virtual GCPs over the study area were created. The size of the virtual grid used was 20x20x20. To remove the sensor-related errors in physical sensor model, three different image correction models (image coordinate translation model, shift and drift model, and affine transformation model) were additionally applied. We evaluated our proposed method in two areas within Korea, one in urban (Seoul) and one in rural (Goheung) areas. The results showed that there was a significant improvement after applying the suggested approach in the two areas. The image coordinate translation model is suggested in terms of GCP requirement and expected errors estimated from the error propagation analysis using Gauss–Markov Model (GMM). 相似文献