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991.
流体地质研究是当代地学研究中的重要前沿课题,已成为发展地质科学、建立新的知识体系的一个主要支柱和知识生长点。本文阐述了当今国内外流体的研究现状、发展水平、流体的涵义、性质、研究方法和研究重点及其与板块构造、变质作用、岩浆作用、成矿作用、成矿作用的重要意义。流体地质为地质科学提出了许多新的研究机会和挑战。该文在简要评述当今花岗岩研究现状的基础上,对花岗岩与金矿的关系进行了深入的讨论,指出了不同成因类型的花岗岩与金矿有着完全不同的关系。人们所说的花岗岩与金矿关系多数情况下应考虑是流体作用的结果。最后指出加强流体地质研究对提高河南地质与金矿的研究水平具有十分重要的实际意义和理论意义。 相似文献
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993.
B. Peng J. M. Sun H. Y. Zhang T. Y. Piao J. Q. Li L. Lei T. Luo D. H. Li Y. J. Zheng R. NAN 《Experimental Astronomy》2004,17(1-3):423-430
Radio frequency interference (RFI) test observations were carried out at one of the candidate Square Kilometre Array (SKA) sites in Guizhou province, following the “RFI Measurement Protocol for Candidate SKA Sites” (hereafter RFI protocol). All data (raw and calibrated) are preserved in some suitable format, such as that set by the international RFI working group of the Site Evaluation and Selection Committee (SESC). An RFI test in December 2003 was performed according to Mode 1 of the RFI Protocol, in order to identify technical difficulties which might arise during a co-ordinated RFI measurement campaign over a period of 1 year. In this paper we describe the current equipment, observational technique and data presentation. The preliminary results demonstrate that the RFI situation at Dawodang depression in Guizhou province makes it quite a promising location for the proposed SKA. Furthermore, the first session of the RFI monitoring program, which was made in May 2004, showed that a complete RFI measurement including both modes 1 and 2 of the RFI Protocol would take about 2 weeks. The possible ways to minimize some limitations of the current equipment are also discussed, which will enable us to meet the RFI protocol. 相似文献
994.
The discovery by Swift that a good fraction of gamma-ray bursts (GRBs) have a slowly decaying X-ray afterglow phase led to the suggestion that energy injection into the blast wave takes place several hundred seconds after the burst. This implies that right after the burst the kinetic energy of the blast wave was very low and in turn the efficiency of production of γ-rays during the burst was extremely high, rendering the internal shocks model unlikely. We re-examine the estimates of kinetic energy in GRB afterglows and show that the efficiency of converting the kinetic energy into γ-rays is moderate and does not challenge the standard internal shock model. We also examine several models, including in particular energy injection, suggested to interpret this slow decay phase. We show that with proper parameters, all these models give rise to a slow decline lasting several hours. However, even those models that fit all X-ray observations, and in particular the energy injection model, cannot account self-consistently for both the X-ray and the optical afterglows of well-monitored GRBs such as GRB 050319 and GRB 050401. We speculate about a possible alternative resolution of this puzzle. 相似文献
995.
The characteristics of the response of equatorial Pacific upper ocean current to westerly wind bursts(WWB)were analyzed in the frequency domain by using wind and ADCP data collected by the Shiyan3 during TOGA-COARE IOP,1992-1993.The preliminary results showed that the response consistedof an eastward surface jet at shallower than 60m depth,a westward counter current centering near100m and a shear layer between them,with the variations of all three being nonlinear and nearlysynchronous.The oceanic responses in the frequency domain were characterized by occurrences of a remotely forced mixed Rossby-gravity wave with period of 8-10 days in the surface jet andcountercurrent at shallower than 110 m depth,and two locally forced waves with periods of 24 daysand 4-5 days limited in shallower than 70m depth.These fluctuations of the responses depended much more on zonal wind than meridional wind.The results also revealed that the oceanic response toWWB resulted from momentum transport and energy propagation assoc 相似文献
996.
辽东、辽西石炭系(地台型)发育,化石丰富,是研究我国北方石炭系及矿产的理想地区。华北缺失下石炭统早已成“定论”,但笔者通过植物化石研究证实东北南部存在早石炭世地层无疑,并建立了Sub-lepidodendron-Achaeocalamites-Cardiopteridiumspetsbergense组合带。与此同时,作者又在辽东、辽西石炭系下部采到了丰富的孢粉化石共36属75种,并归结为Lycosporapusilla-Crassisporakosankei组合,时代为早石炭世晚期,即维宪-纳缪尔A期。从而孢粉、植物大化石互为佐证,进一步肯定辽东、辽西存在早石炭世地层,进而改写了华北地质史的内容,并对古构造、古地理的研究具有重要意义。另外,孢粉层位还发现了丰富的叶肢介化石,这是我国石炭纪的第3处叶肢介产地,对叶肢介的起源、演化及利用多门类生物化石解决石炭系的内部界线划分积累了资料。 相似文献
997.
THE VERTICAL DISTRIBUTION OF AGROTOPOCLIMATIC RESOURCES IN THE WARM SECTORS OF THE THREE GORGES AREA OF THE CHANGJIANG RIVER 总被引:1,自引:0,他引:1
罗洪,邓先瑞THEVERTICALDISTRIBUTIONOFAGROTOPOCLIMATICRESOURCESINTHEWARMSECTORSOFTHETHREEGORGESAREAOFTHECHANGJIANGRIVER¥DengXianrui;... 相似文献
998.
999.
1000.
济宁市保有煤炭资源储量123.9亿t,其中天然焦4.1亿t,约占山东省的一半。随着几大天然焦赋存煤田周边勘探找煤工作的深入,天然焦的资源储量还将增加4亿~11亿t,最终济宁市的天然焦资源储量将达8亿~15亿t。如何综合利用天然焦将直接影响济宁市乃至山东省资源开发利用水平,并关系到“节能降耗”的能源战略和矿区的服务年限。 相似文献