全文获取类型
收费全文 | 1352篇 |
免费 | 150篇 |
国内免费 | 198篇 |
专业分类
测绘学 | 452篇 |
大气科学 | 183篇 |
地球物理 | 199篇 |
地质学 | 371篇 |
海洋学 | 112篇 |
天文学 | 3篇 |
综合类 | 163篇 |
自然地理 | 217篇 |
出版年
2024年 | 3篇 |
2023年 | 15篇 |
2022年 | 25篇 |
2021年 | 39篇 |
2020年 | 53篇 |
2019年 | 48篇 |
2018年 | 41篇 |
2017年 | 73篇 |
2016年 | 83篇 |
2015年 | 80篇 |
2014年 | 77篇 |
2013年 | 124篇 |
2012年 | 111篇 |
2011年 | 111篇 |
2010年 | 89篇 |
2009年 | 95篇 |
2008年 | 94篇 |
2007年 | 85篇 |
2006年 | 68篇 |
2005年 | 66篇 |
2004年 | 70篇 |
2003年 | 33篇 |
2002年 | 25篇 |
2001年 | 26篇 |
2000年 | 25篇 |
1999年 | 15篇 |
1998年 | 14篇 |
1997年 | 19篇 |
1996年 | 15篇 |
1995年 | 13篇 |
1994年 | 12篇 |
1993年 | 8篇 |
1992年 | 10篇 |
1991年 | 5篇 |
1990年 | 7篇 |
1989年 | 6篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1982年 | 1篇 |
1980年 | 1篇 |
排序方式: 共有1700条查询结果,搜索用时 15 毫秒
71.
勘探工程地质统计信息法 总被引:2,自引:0,他引:2
勘探工程地质统计信息法试图运用定量评价准则研究勘探工程,而定量评价准则是建立在矿体数学模型基础上。本文在最优勘探方案和最优工程位置选择方面作了一些研究。 相似文献
72.
我国月降水和气温网格点资料的处理和分析 总被引:14,自引:2,他引:14
用逐步搜索逼近法的客观分析技术计算出1951-1992年中国月降水量和月平均气温的格点资料,并利用图象识别原理对格点值和站点观测值进行了比较。 相似文献
73.
本文将分形几何学的思想和方法引进对地学数据的插值处理与计算机成图的研究中,建立了适合于具有随机形特征的地学数据的“局部分数布朗场”数学模型,在讨论和分析了Voss提出的“逐次随机添加”与Barnsley提出的“分形插值函数”这两种可用于分形插值法,并将它们应用到对地貌,化探,物探等地学数据进行插值,网格化和计算机成图上。 相似文献
74.
全球最优插值客观分析 总被引:7,自引:0,他引:7
主要叙述国家气象中心实时运行的全球资料同化系统中的客观分析方案,该方案采用最优插值统计方法,使用所有可以使用的各种类型有不同误差的观测资料和模式的6h预报值,给出数值形式的全球分析值。在两年的业务运行中,为T42中期数值预报谱模式提供了较好的初始场。 相似文献
75.
76.
77.
Interpolated grids of coal bed thickness are being considered for use in a proposed method for taxation of coal in the state of West Virginia (United States). To assess the origin and magnitude of possible inaccuracies in calculated coal tonnage, we used conditional simulation to generate equiprobable realizations of net coal thickness for two coals on a 7
min topographic quadrangle, and a third coal in a second quadrangle. Coals differed in average thickness and proportion of original coal that had been removed by erosion; all three coals crop out in the study area. Coal tonnage was calculated for each realization and for each interpolated grid for actual and artificial property parcels, and differences were summarized as graphs of percent difference between tonnage calculated from the grid and average tonnage from simulations. Coal in individual parcels was considered minable for valuation purposes if average thickness in each parcel exceeded 30 inches. Results of this study show that over 75% of the parcels are classified correctly as minable or unminable based on interpolation grids of coal bed thickness. Although between 80 and 90% of the tonnages differ by less than 20% between interpolated values and simulated values, a nonlinear conditional bias might exist in estimation of coal tonnage from interpolated thickness, such that tonnage is underestimated where coal is thin, and overestimated where coal is thick. The largest percent differences occur for parcels that are small in area, although because of the small quantities of coal in question, bias is small on an absolute scale for these parcels. For a given parcel size, maximum apparent overestimation of coal tonnage occurs in parcels with an average coal bed thickness near the minable cutoff of 30 in. Conditional bias in tonnage for parcels having a coal thickness exceeding the cutoff by 10 in. or more is constant for two of the three coals studied, and increases slightly with average thickness for the third coal. 相似文献
78.
Temporal and spatial rainfall patterns were analysed to describe the distribution of daily rainfall across a medium‐sized (379km2) tropical catchment. Investigations were carried out to assess whether a climatological variogram model was appropriate for mapping rainfall taking into consideration the changing rainfall characteristics through the wet season. Exploratory, frequency and moving average analyses of 30 years' daily precipitation data were used to describe the reliability and structure of the rainfall regime. Four phases in the wet season were distinguished, with the peak period (mid‐August to mid‐September) representing the wettest period. A low‐cost rain gauge network of 36 plastic gauges with overflow reservoirs was installed and monitored to obtain spatially distributed rainfall data. Geostatistical techniques were used to develop global and wet season phase climatological variograms. The unscaled climatological variograms were cross‐validated and compared using a range of rainfall events. Ordinary Kriging was used as the interpolation method. The global climatological variogram performed better, and was used to optimize the number and location of rain gauges in the network. The research showed that although distinct wet season phases could be established based on the temporal analysis of daily rainfall characteristics, the interpolation of daily rainfall across a medium‐sized catchment based on spatial analysis was better served by using the global rather than the wet season phase climatological variogram model. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
79.
This paper presents the results of a study of a watershed experiencing the pressures of land-use change resulting from urban development. The study was undertaken to facilitate an understanding of the water balance of the watershed by developing and implementing watershed procedures that are to be addressed in a watershed plan. There were three components to the research: firstly, observation of the effects of spatially distributed rainfall measurements and their effect on modelling were assessed. Secondly, the model was then calibrated by observing how differing techniques can discretize both the landscape (e.g. land-use and soil type) and incoming precipitation. Finally, a modelling methodology was developed to integrate a Geographic Information System and a hydrologic model (e.g. Storm Water Management Model) in a water balance analysis on a watershed basis. Results show that, under certain conditions, kriging spatially distributed rainfall values can help predict rainfall at ungauged (virtual) sites. Discretization of a watershed was found to affect the differences between measured and generated runoff volumes; however, this can be refined with calibration. It was seen that a strong correlation between measured and predicted rainfall values did not always guarantee a strong relationship between measured and generated runoff Recommendations include the use of a longer time series of rainfall, streamflow and predicted rainfall to observe temporal variations, and the need to assess the differences in modelled rainfall values generated by various surface interpolation methods (e.g. Inverse Distance Weighting and other kriging options) currently available in GIS packages. 相似文献
80.