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991.
992.
矿床同位素定年方法的应用现状评析 总被引:1,自引:0,他引:1
高质量的年代学数据是矿床研究和对比的基础.针对近二十几年来在具体矿床同位素定年研究中,不同学者对同一矿床采用不同的定年方法常常得出相差十分悬殊的结论,甚至出现与地质事实截然相悖年龄数据的现象,文章对最常用的锆石U-Pb法、自生伊利石K-Ar法、金属硫化物Re-0s和Sm-Nd法、石英流体包裹体40Ar/39Ar法和Rb-Sr等时线法以及释光测年进行了评析.强调一套合理的矿床同位素年龄数据的获得,必须加强对地质背景的研究;明确测年矿物与矿化的成因联系,选择合适的定年方法.综合地质背景及可靠准确的年代学数据,对地质事件与成矿事件的联系做出合理的解释. 相似文献
993.
In this paper, the numerical simulation bias of the non-hydrostatic version GRAPES-Meso (Mesoscale of the Global and Regional Assimilation and Prediction System) at the resolution of 0.18o for a torrential rain case, which happened in May 31st to June 1st 2005 over Hunan province, are diagnosed and investigated by using the radiosondes, intensive surface observation, and the operational global analysis data, and the sensitivity experimental results as well. It is shown in the result that the GRAPES-Meso could reproduce quite well the main features of large-cale circulation and the distribution of the accumulated 24h precipitation and the key locations of the torrential rainfall are captured reasonably well by the model. However, bias exist in the simulation of the mesoscale features of the torrential rain and details of the relevant systems, for example, the simulated rainfall that is too earlier in model integration and remarkable underprediction of the peak value of rainfall rates over the heaviest rainfall region, the weakness of the upper jet simulation and the overprediction of the south-west wind in the lower troposphere etc. The investigation reveals that the sources of the simulation bias are different. The erroneous model rainfall in the earlier integration stage over the heaviest rainfall region is induced by the model initial condition bias of the wind field at about 925hPa over the torrential rainfall region, where the bias grow rapidly and spread upward to about 600hPa level within the few hours into the integration and result in abnormal convergence of the wind and moisture, and thus the unreal rainfall over that region. The large bias on the simulated rainfall intensity over the heaviest rainfall region might be imputed to the following combined factors of (1) the simulation bias on the strength and detailed structures of the upper-level jet core which bring about significant underpredictions of the dynamic conditions (including upper-level divergence and the upward motion) for heavy rainfall due to unfavorable mesoscale vertical coupling between the strong upper-level divergence and lower-level convergence; and (2) the inefficient coupling of the cumulous parameterization scheme and the explicit moisture in the integration, which causes the failure of the explicit moisture scheme in generating grid-scale rainfall in a certain extent through inadequate convective adjustment and feedback to the grid-scale. In addition, the interaction of the combined two factors could form a negative feedback to the rainfall intensity simulation, and eventually lead to the obvious underprediction of the rainfall rate. 相似文献
994.
Variables fields such as enstrophy, meridional-wind and zonal-wind variables are derived from monthly 500 hPa geopotential height anomalous fields. In this work, we select original predictors from monthly 500-hPa geopotential height anomalous fields and their variables in June of 1958 - 2001, and determine comprehensive predictors by conducting empirical orthogonal function (EOF) respectively with the original predictors. A downscaling forecast model based on the back propagation (BP) neural network is built by use of the comprehensive predictors to predict the monthly precipitation in June over Guangxi with the monthly dynamic extended range forecast products. For comparison, we also build another BP neural network model with the same predictands by using the former comprehensive predictors selected from 500-hPa geopotential height anomalous fields in May to December of 1957 - 2000 and January to April of 1958 - 2001. The two models are tested and results show that the precision of superposition of the downscaling model is better than that of the one based on former comprehensive predictors, but the prediction accuracy of the downscaling model depends on the output of monthly dynamic extended range forecast. 相似文献
995.
996.
在介绍城市室内空气污染的现状、空气污染物的主要来源种类及其对人体健康造成危害的基础上,对目前常用的控制室内空气污染、改善室内空气质量的方法进行了对比分析,并提出了一些建设性意见. 相似文献
997.
998.
999.
降水自记纸数据化处理常见问题及解决方法 总被引:1,自引:0,他引:1
结合近年来的实际工作经验,详细分析降水自记纸数据化处理过程中的一些常见的问题,并提出相应的解决方法。 相似文献
1000.
介绍了自动气象站系统中各种传感器、采集器、通讯线路、电源系统、计算机等硬件在日常维护中的维护方法. 相似文献