全文获取类型
收费全文 | 19373篇 |
免费 | 2147篇 |
国内免费 | 2339篇 |
专业分类
测绘学 | 8737篇 |
大气科学 | 2192篇 |
地球物理 | 2140篇 |
地质学 | 5302篇 |
海洋学 | 1699篇 |
天文学 | 507篇 |
综合类 | 1960篇 |
自然地理 | 1322篇 |
出版年
2024年 | 204篇 |
2023年 | 729篇 |
2022年 | 971篇 |
2021年 | 1201篇 |
2020年 | 720篇 |
2019年 | 1079篇 |
2018年 | 745篇 |
2017年 | 851篇 |
2016年 | 742篇 |
2015年 | 906篇 |
2014年 | 1254篇 |
2013年 | 979篇 |
2012年 | 1107篇 |
2011年 | 945篇 |
2010年 | 1006篇 |
2009年 | 1028篇 |
2008年 | 1107篇 |
2007年 | 980篇 |
2006年 | 815篇 |
2005年 | 778篇 |
2004年 | 706篇 |
2003年 | 680篇 |
2002年 | 551篇 |
2001年 | 469篇 |
2000年 | 385篇 |
1999年 | 319篇 |
1998年 | 339篇 |
1997年 | 369篇 |
1996年 | 304篇 |
1995年 | 309篇 |
1994年 | 305篇 |
1993年 | 186篇 |
1992年 | 188篇 |
1991年 | 176篇 |
1990年 | 137篇 |
1989年 | 122篇 |
1988年 | 32篇 |
1987年 | 16篇 |
1986年 | 18篇 |
1985年 | 7篇 |
1984年 | 11篇 |
1983年 | 5篇 |
1982年 | 13篇 |
1981年 | 6篇 |
1980年 | 7篇 |
1979年 | 5篇 |
1977年 | 4篇 |
1957年 | 9篇 |
1954年 | 7篇 |
1935年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 375 毫秒
981.
TOPEX/POSEIDON altimeter data from October 1992 to June 2002 are used to calculate the global barotropic M2 tidal currents using long-term tidal harmonic analysis. The tides calculated agree well with ADCP data obtained from the South China Sea (SCS). The maximum tide velocities along the semi-major axis and semi-minor axis can be computed from the tidal ellipse. The global distribution of M2 internal tide vertical energy flux from the sea bottom is calculated based on a linear internal wave generation model. The global vertical energy flux of M2 internal tide is 0.96 TW, with 0.36 TW in the Pacific, 0.31 TW in the Atlantic and 0.29 TW in the Indian Ocean, obtained in this study. The total horizontal energy flux of M2 internal tide radiating into the open ocean from the lateral boundaries is 0.13 TW, with 0.06 TW in the Pacific, 0.04TW in the Atlantic, and 0.03 TW in the Indian Ocean. The result shows that the principal lunar semi-diurnal tide M2 provides enough energy to maintain the large-scale thermohaline circulation of the ocean. 相似文献
982.
李兆新 《中国海洋湖沼学报》2009,27(3):468-472
We investigated the metabolism of pectenotoxins in brown crabs(Cancer pagurus).The crabs were fed with blue mussels(Mytilus edulis) for 21 d then depurated for 42 d.We extracted the toxins from the digestive glands of contaminated crabs,uncontaminated crabs(control group),and the meat of blue mussels using methanol.Extracts of the crab digestive glands were fractionated by liquid-liquid partitioning and solid phase extraction.The fractions were analyzed by liquid chromatography coupled with tandem mass spec... 相似文献
983.
Improvement of Urban Impervious Surface Estimation in Shanghai Using Landsat7 ETM+ Data 总被引:2,自引:2,他引:0
Wenze Yue 《中国地理科学(英文版)》2009,19(3):283-290
This paper explores the potential to improve the impervious surface estimation accuracy using a multi-stage approach on the
basis of vegetation-impervious surface-soil (V-I-S) model. In the first stage of Spectral Mixture Analysis (SMA) process,
pixel purity index, a quantitative index for defining endmember quality, and a 3-dimensional endmember selection method were
applied to refining endmembers. In the second stage, instead of obtaining impervious surface fraction by adding high and low
albedo fractions directly, a linear regression model was built between impervious surface and high/low albedo using a random
sampling method. The urban impervious surface distribution in the urban central area of Shanghai was predicted by the linear
regression model. Estimation accuracy of spectral mixture analysis and impervious surface fraction were assessed using root
mean square (RMS) and color aerial photography respectively. In comparison with three different research methods, this improved
estimation method has a higher overall accuracy than traditional Linear Spectral Mixture Analysis (LSMA) method and the normalized
SMA model both in root mean square error (RMSE) and standard error (SE). However, the model has a tendency to overestimate
the impervious surface distribution.
Foundation item: Under the auspices of National Natural Science Foundation of China (No. 40701177) 相似文献
984.
日前,中国国土资源航空物探遥感中心成功获取了三峡库区首批高精度航空遥感数据,标志着长江中上游(江津-宜昌段)1:5万航空遥感地质调查项目库区航空遥感调查工作全面展开。三峡地区属中低纬度亚热带气候区,常年以阴雨天居多,日照少,雾气重。为在最短时间内获取库区4万km^2高分辨率航空遥感影像,航遥中心积极与空军协调, 相似文献
985.
Evaporation (E) rate and precipitation (P) rate are two significant meteorological elements required in the ocean baroclinic
modeling as external forcings. However, there are some uncertainties in the currently used E/P rates datasets, especially
in terms of the data quality. In this study, we collected E/P rates data from ERA-40, NCEP/NCAR Reanalysis, HOAPS for the
Bohai Sea and nine routine stations around Laizhou Bay, and made comparisons among them. It was found that the differences
in E/P rates between land and sea are remarkable, which was due to the difference in underlying surfaces. Therefore, the traditional
way of using E/P rates acquired on land directly at sea is not correct. Since no final conclusion has been reached concerning
the net water transport between the Bohai Sea and the Yellow Sea, it is unfeasible to judge the adequacy of the four kinds
of data by using the water budget equation. However, the E/P rates at ERA-40 sea points were considered to be the optimal
in terms of temporal/spatial coverage and resolution for the hindcast of salinity variation in the Bohai Sea. Besides, using
the 3-D hydrodynamic model HAMSOM (HAMburg Shelf Ocean Model), we performed numerical experiments with different E/P datasets
and found that the E/P rates at sea points from ERA-40 dataset are better than those from NCEP/NCAR Reanalysis dataset. If
NCEP/NCAR Reanalysis E/P rates are to be used, they need to be adjusted and tested prior to simulation so that more close-to-reality
salinity values can be reproduced. 相似文献
986.
(编者按]桃源县位于湖南省西北部,东西直线距离75公里,南北直线距离118公里,土地面积4447平方公里,居全省第四,耕地面积141万亩,居全省第一,全县辖40个乡镇、878个村(居)委会.在全省第二次土地调查实施方案中,桃源县被列为全市唯一的第二批土地调查单位. 相似文献
987.
Oracle数据库管理系统已成为我国国家级和省级国土资源基础数据库建设的主流技术平台。该文就国家级和省级数据库的建设,提出了在Oracle数据库技术环境下,如何在物理上合理组织和布局各种类型的数据,如何设置和管理各衍生数据,如何实施数据完整性要求,其目的是实现国土资源基础数据的高效管理和可持续更新支持,更好地满足国土资源基础数据库之上各业务应用系统运转的要求。 相似文献
988.
989.
990.