首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   3042篇
  免费   357篇
  国内免费   278篇
测绘学   1086篇
大气科学   334篇
地球物理   691篇
地质学   703篇
海洋学   274篇
天文学   26篇
综合类   263篇
自然地理   300篇
  2024年   7篇
  2023年   20篇
  2022年   58篇
  2021年   74篇
  2020年   97篇
  2019年   155篇
  2018年   109篇
  2017年   154篇
  2016年   151篇
  2015年   149篇
  2014年   163篇
  2013年   223篇
  2012年   168篇
  2011年   180篇
  2010年   141篇
  2009年   149篇
  2008年   165篇
  2007年   161篇
  2006年   143篇
  2005年   151篇
  2004年   130篇
  2003年   124篇
  2002年   76篇
  2001年   78篇
  2000年   74篇
  1999年   70篇
  1998年   76篇
  1997年   69篇
  1996年   58篇
  1995年   47篇
  1994年   40篇
  1993年   43篇
  1992年   20篇
  1991年   24篇
  1990年   18篇
  1989年   18篇
  1988年   17篇
  1987年   14篇
  1986年   15篇
  1985年   12篇
  1984年   7篇
  1983年   1篇
  1982年   9篇
  1981年   6篇
  1980年   6篇
  1979年   2篇
  1978年   1篇
  1976年   2篇
  1973年   1篇
  1954年   1篇
排序方式: 共有3677条查询结果,搜索用时 31 毫秒
981.
总结了现有单桩竖向承载力检测技术存在的一些问题,结合实例提出了一种预测单桩承载力的间接方法———瞬态面波法。剪切波速与标贯击数之间也存在着相关关系,通过标贯击数建立起剪切波速与桩侧摩阻力及桩端阻力的相关模型,应用瞬态面波测试技术可快速检测桩周土剪切波速,确定单桩承载力。  相似文献   
982.
We test a flexible, idealized mean wind profile for the loweratmosphere that can easily be matched to whatever windobservations may be available. Its intended function is to providea `best guess' wind profile from limited observations, e.g., foruse in dispersion models, and to this end, following earlierauthors, we have matched a Monin–Obukhov layer to a baroclinic Ekman layer.To demonstrate the flexibility of the two-layer wind profile, weoptimize its free parameters to provide best interpolative fits toa sample of multi-level wind profiles. These include model windprofiles extracted from the Canadian Global EnvironmentalMulti-scale weather model (GEM), as well as experimental profilesfrom the Wangara experiment, and from an over-ocean dispersionexperiment (LROD). In most cases the two-layer profile fit issatisfactory.  相似文献   
983.
在利用正交小波对图像进行分解的基础上,提出了一种考虑不同尺度子分量的小波系数之间是相互关联的系数概率密度函数模型,而不同尺度的系数的选择依赖于其父层系数的大小,从而保证在消除噪声的同时保留图像的边缘信息,然后再对图像进行重构。实验证明,该方法取得了较好的降噪效果。  相似文献   
984.
一种解算病态问题的方法--两步解法   总被引:10,自引:0,他引:10  
提出了一种解算病态问题的方法———两步解法。在两步计算中,均采用L曲线法来确定正则化参数α。通过算例,比较了该方法和LS估计、岭估计及截断奇异值方法的效果。结果表明,该方法要明显优于LS估计、岭估计及截断奇异值法。  相似文献   
985.
对SRTM3和GTOPO30地形数据质量的评估   总被引:30,自引:0,他引:30  
高分辨率的地形数据在基础地理信息系统、地球重力场建模和大地水准面求定等工程中至关重要。SRTM有3″×3″(SRTM3)和1″×1″(SRTM1)两种分辨率。就全球而言,SRTM3的原始数据已于2004年解密。SRTM3的高程基准是EGM96的大地水准面,平面基准是WGS84;标称绝对高程精度是±16m,绝对平面精度是±20m。SRTM3的数据只覆盖60°N至54°S带状区域内的DSM。对覆盖全球的GTOPO30的DTM也作了概要介绍。  相似文献   
986.
The findings of this paper are summarized as follows: (1) We propose a sign-constrained robust estimation method, which can tolerate 50% of data contamination and meanwhile achieve high, least-squares-comparable efficiency. Since the objective function is identical with least squares, the method may also be called sign-constrained robust least squares. An iterative version of the method has been implemented and shown to be capable of resisting against more than 50% of contamination. As a by-product, a robust estimate of scale parameter can also be obtained. Unlike the least median of squares method and repeated medians, which use a least possible number of data to derive the solution, the sign-constrained robust least squares method attempts to employ a maximum possible number of good data to derive the robust solution, and thus will not be affected by partial near multi-collinearity among part of the data or if some of the data are clustered together; (2) although M-estimates have been reported to have a breakdown point of 1/(t+1), we have shown that the weights of observations can readily deteriorate such results and bring the breakdown point of M-estimates of Huber’s type to zero. The same zero breakdown point of the L 1-norm method is also derived, again due to the weights of observations; (3) by assuming a prior distribution for the signs of outliers, we have developed the concept of subjective breakdown point, which may be thought of as an extension of stochastic breakdown by Donoho and Huber but can be important in explaining real-life problems in Earth Sciences and image reconstruction; and finally, (4) We have shown that the least median of squares method can still break down with a single outlier, even if no highly concentrated good data nor highly concentrated outliers exist. An erratum to this article is available at .  相似文献   
987.
One of the typical approaches to linear, inequality-constrained adjustment (LICA) is to solve a least-squares (LS) problem subject to the linear inequality constraints. The main disadvantage of this approach is that the statistical properties of the estimate are not easily determined and thus no general conclusions about the superiority of the estimate can be made. A new approach to solving the LICA problem is proposed. The linear inequality constraints are converted into prior information on the parameters with a uniform distribution, and consequently the LICA problem is reformulated into a Bayesian estimation problem. It is shown that the LS estimate of the LICA problem is identical to the Bayesian estimate based on the mode of the posterior distribution. Finally, the Bayesian method is applied to GPS positioning. Results for four field tests show that, when height information is used, the GPS phase ambiguity resolution can be improved significantly and the new approach is feasible.  相似文献   
988.
The objective of this paper is the comparison of various types of estimators that can be used in linear models with uniformly biased data. This particular case refers to adjustment problems where the available measurements are affected by a common, unknown and uniform offset. The classic least-squares (LS) unbiased estimators for this type of models are reviewed in detail, and some additional remarks on their properties and performance are given. Furthermore, a family of biased estimators for linear models with uniformly biased data is introduced, which has the potential to provide better performance (in terms of mean squared estimation error) than the ordinary LS unbiased solutions. A number of different regularization viewpoints that can be equivalently associated with these biased estimators are presented, along with a discussion on various selection strategies that can be employed for the choice of the regularization parameter that enters into the biased estimation algorithm.  相似文献   
989.
一种新的运动检测及轮廓追踪方法   总被引:7,自引:0,他引:7  
构建了基于块区域二阶矩比的三帧差分运动检测模型,应用文献[1]中的核密度估计模型来滤除其中的非运动区域,并采用支持向量聚类实现多目标检测。给出了运动物体轮廓快速追踪的RW算法,该算法不必考虑检测区域内部的细节问题,能够充分利用所检测到的边缘信息,比较符合人眼对轮廓的搜索习惯。最后给出了实验结果。  相似文献   
990.
小型水库泥沙淤积成因分析及淤积量的初步估算   总被引:3,自引:0,他引:3  
孙和平 《地下水》2005,27(3):221-222,224
从河流动力学角度分析了小型水库淤积的物理成因,探讨了小型水库入库泥沙量的估算方法,以便根据淤积量和淤积速度估算小型水库运行年限,为合理地规划小型水库的蓄水量以及兴利库容、防洪库容,发挥小型水库的最佳效益,提供基础资料.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号