全文获取类型
收费全文 | 8200篇 |
免费 | 1769篇 |
国内免费 | 2630篇 |
专业分类
测绘学 | 1195篇 |
大气科学 | 1259篇 |
地球物理 | 1511篇 |
地质学 | 4392篇 |
海洋学 | 2112篇 |
天文学 | 173篇 |
综合类 | 720篇 |
自然地理 | 1237篇 |
出版年
2024年 | 60篇 |
2023年 | 174篇 |
2022年 | 491篇 |
2021年 | 552篇 |
2020年 | 445篇 |
2019年 | 523篇 |
2018年 | 495篇 |
2017年 | 482篇 |
2016年 | 485篇 |
2015年 | 466篇 |
2014年 | 516篇 |
2013年 | 668篇 |
2012年 | 608篇 |
2011年 | 686篇 |
2010年 | 678篇 |
2009年 | 592篇 |
2008年 | 619篇 |
2007年 | 604篇 |
2006年 | 601篇 |
2005年 | 485篇 |
2004年 | 391篇 |
2003年 | 287篇 |
2002年 | 335篇 |
2001年 | 349篇 |
2000年 | 242篇 |
1999年 | 161篇 |
1998年 | 111篇 |
1997年 | 72篇 |
1996年 | 79篇 |
1995年 | 61篇 |
1994年 | 43篇 |
1993年 | 28篇 |
1992年 | 41篇 |
1991年 | 21篇 |
1990年 | 21篇 |
1989年 | 11篇 |
1988年 | 12篇 |
1987年 | 15篇 |
1986年 | 21篇 |
1985年 | 11篇 |
1984年 | 10篇 |
1983年 | 10篇 |
1982年 | 7篇 |
1981年 | 5篇 |
1980年 | 2篇 |
1979年 | 4篇 |
1975年 | 3篇 |
1965年 | 2篇 |
1964年 | 2篇 |
1954年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 156 毫秒
1.
2.
Reservoirs of lowland floodplain rivers with eutrophic backgrounds cause variations in the hydrological and hydraulic conditions of estuaries and low-dam reservoir areas, which can promote planktonic algae to proliferate and algal bloom outbreaks. Understanding the ecological effects of variations in hydrological and hydraulic processes in lowland rivers is important for algal bloom control. In this study, the middle and lower reaches of the Han River, China, a typical regulated lowland river with a eutrophic background, are selected. Based on the effect of hydrological and hydraulic variability on algal blooms, a hydrological management strategy for river algal bloom control is proposed. The results showed that (a) differences in river morphology and background nutrient levels cause significant differences in the critical threshold flow velocities for algal bloom outbreaks between natural river and low-dam reservoir sections; there is no uniform threshold flow velocity for algal bloom control. (b) There are significant differences in the river hydrological/hydraulic conditions between years with and without algal blooms. The average river flow, water level and velocity in years with algal blooms are significantly lower than those in years without algal blooms. (c) For different river sections where algal blooms occur and to meet the threshold flow velocities, the joint operation of cascade reservoirs and diversion projects is an effective method to prevent and control algal blooms in regulated lowland rivers. This study is expected to deepen our understanding of the ecological significance of special hydrological processes and guide algal bloom management in regulated lowland rivers. 相似文献
3.
本文讨论了彗星中尘埃粒子的充电机制 ,带电特性和平衡电势的变化规律 ,分析了彗星尘埃的破碎特性和临界半径 ,得出了很有意义的结果 相似文献
4.
滇西动态重力网的分形特征及空间分辨力 总被引:1,自引:1,他引:0
贾民育 《大地测量与地球动力学》1996,(4)
介绍了用分形学描述地球物理观测网非均匀分布和联合应用分形特征与Shannon定理确定最佳网格距的方法。研究了滇西动态重力网的分形特征,它的分形维Df=1.27,最佳网格距r0=28km。讨论了1986年至1994年间网区发生的8次Ms>5.0级地震前重力场变化的可信性,指出这些变化的波长均大于100km,至少2倍于网的最小空间分辨力,因而是可信的 相似文献
5.
A new compilation of N‐isotope and abundance data for metasedimentary rocks, and hyrdothermal micas that proxy for bulk crust, show systematic patterns. (1) δ15N values of kerogen in Precambrian cherts are more negative relative to siliciclastic counterparts, probably due to a mantle hydrothermal component. (2) There is a secular trend from average δ15N 15.3 ± 1.8‰ in Archean shales, through intermediate values in the Proterozoic, to Phanerozoic counterparts where δ15N averages +3.5‰. (3) Hydrothermal micas in metamorphic hydrothermal systems of Palaeozoic and Mesozoic age that proxy for crust have δ15N within the range of contemporaneous sedimentary rocks. (4) Hydrothermal micas track the secular trend of δ15N for kerogen from 2.7 Ga to the Phanerozoic. (5) Within Precambrian datasets δ15N does not increase with decreasing N content; accordingly, high δ15N values cannot stem either from metamorphism or form Rayleigh fractionation. (6) Previous studies show isotopic shifts during metamorphism are only +1 to +3‰ up to amphibolite facies. Values of 10–24‰ are attributed to a high δ15N Archean atmosphere, a residual signature of CI carbonaceous chondrites where δ15N is +30‰ to + 42‰. 相似文献
6.
7.
An algorithm for detecting outliers and cycle slips in single-frequency GPS using a 3rd order polynomial model of the Kalman filter and for estimating the ambiguity by using optimal wavelet is presented in this paper. It is applicable to the carrier phase measurement with sample rate of one per second. The results of calculation with the GPS data aboard satellite Topex on 1995 June 22 show that the algorithm is so efficient that it can accurately estimate the ambiguity even for signals interrupted by a few seconds. 相似文献
8.
BIAN Jian-min LIN Nian-feng TANG Jie College of Environment Resources Jilin University Changchun Jilin China 《东北亚地学研究》2005,(Z1)
Desertification is an environmental issue in the world. The salt-alkalization desertification land area formed by both primary and secondary salt-alkalization has extended in a large scale, which has become a significant eco-environmental problem. Based on the characteristics of eco-environment and the situation of desertification in western Songnen plain, this paper reports the analyzes of its formation in background and cause. An early warning system on the salt-alkalization desertification is established and the GIS technology is used to abstract the information of desertification evaluation index. Supported by the integrated technology of the GIS and ANN, the orientation and quantitative result of desertification are gained, which is helpful to the eco-environment protection and resource development in western Songnen Plain. 相似文献
9.
林一山 《地球信息科学学报》1996,(2):43-46
随着我国人口日益增多,经济形势的飞速发展,加快开发西部的任务日趋紧迫和重要。而西部南水北调则是开发西部必须先行的关键性工程。这项工程是从青藏高原怒江、澜沧江、金沙江、雅砻江、大渡河等五大水系调水,穿过巴颜喀拉山入黄,以黄河大柳树枢纽为总灌渠渠首,把水引向内蒙西部,直至新疆东部地区。引水路线跨越西藏、四川、青海、甘肃、内蒙、新疆等地。此项工程调水量约800亿立方米,一旦实现,将使那里沙漠变绿洲,可开发那里东部地区稀少的矿产及其它资源。 相似文献
10.