全文获取类型
收费全文 | 687篇 |
免费 | 140篇 |
国内免费 | 164篇 |
专业分类
测绘学 | 140篇 |
大气科学 | 100篇 |
地球物理 | 179篇 |
地质学 | 339篇 |
海洋学 | 117篇 |
天文学 | 8篇 |
综合类 | 61篇 |
自然地理 | 47篇 |
出版年
2024年 | 5篇 |
2023年 | 6篇 |
2022年 | 20篇 |
2021年 | 17篇 |
2020年 | 30篇 |
2019年 | 30篇 |
2018年 | 17篇 |
2017年 | 30篇 |
2016年 | 28篇 |
2015年 | 28篇 |
2014年 | 36篇 |
2013年 | 46篇 |
2012年 | 40篇 |
2011年 | 51篇 |
2010年 | 47篇 |
2009年 | 36篇 |
2008年 | 34篇 |
2007年 | 44篇 |
2006年 | 36篇 |
2005年 | 38篇 |
2004年 | 43篇 |
2003年 | 48篇 |
2002年 | 28篇 |
2001年 | 28篇 |
2000年 | 32篇 |
1999年 | 33篇 |
1998年 | 33篇 |
1997年 | 15篇 |
1996年 | 13篇 |
1995年 | 21篇 |
1994年 | 30篇 |
1993年 | 10篇 |
1992年 | 7篇 |
1991年 | 4篇 |
1990年 | 5篇 |
1989年 | 11篇 |
1988年 | 3篇 |
1987年 | 4篇 |
1986年 | 4篇 |
排序方式: 共有991条查询结果,搜索用时 31 毫秒
1.
本文提出了一种地震折射液的虚拟射线理论,根据该理论,只要已知地表层的速度,即可直接由折射波信息提取地震参数,从而可实现折射界面的反演。 文中通过实际介质模型的计算机实验结果,验证了该理论的正确性。 相似文献
2.
Qiu Dahong Zang Jun Jia Ying
Academician of the Chinese Academy of Sciences Professor the State Key Laboratory of Coastal Offshore Engineering 《中国海洋工程》1996,(2)
Based on the 2nd order cnoidal wave theory, the characters of shallow water standing waves and their action on vertical walls are studied in this paper. The theoretical expressions of the wave surface elevation in front of and the wave pressure on the vertical wall are obtained. In order to verify the theoretical results, model tests were made in the State Key Laboratory of Coastal and Offshore Engineering at DUT. For the wave surface elevation in front of the wall and the wave forces on the wall at the moment when the wave surface at the wall surface goes down to the bottom of the wave trough, the calculated results coincide quite well with the experimental results. For the wave forces on the wall at the moment when the wave surface at the wall surface goes up to the top of the wave crest, the theoretical expressions are modified by the experimental results. For the convenience of practical use, calculations are made for the wave conditions which usually occur in enginering practice by use of the inves 相似文献
3.
介绍了斜坡式防波堤砌石护面中的插砌条石和干砌块石在波浪作用下的力学图式及作用机理 ,重点给出考虑摩擦力作用时的砌石块体稳定厚度的计算公式 ,并结合工程实例验证了公式的适用性 相似文献
4.
将现代人工神经网络方法应用于地质学的判别分析,通过实例计算表明,无论是对于两组判别分析还是多组判别分析,人工神经网络方法都是切实可行的。 相似文献
5.
本文推导了随机载荷下的疲劳损伤计算公式。数值计算结果表明:P.H.Wirsching给出的公式在宽带情况下与实际情况不符;G.Chaudhury给出的公式在窄带情况下与实际不符;本文绘出的公式不仅适合于窄带,也适合于具有各种不同带宽的宽带随机载荷。 相似文献
6.
长江口泥沙絮凝静水沉降动力学模式的试验研究 总被引:10,自引:1,他引:10
细颗粒泥沙在咸水中的絮凝沉降是河流泥沙向海输送过程中在河口区发生的重要现象,是河口拦门沙形成与发育的主要原因之一。本文根据室内模拟试验研究,提出长江口泥沙絮凝静水沉降的二级动力学模式,通过该式求得不同泥沙含量和盐度情况下絮凝沉降的衰减系数,半衰期和平均沉降速率等动力学参数,定量地分析泥沙含量和盐度对泥沙絮凝沉降过程的影响。 相似文献
7.
8.
The present paper deals with the specification of bed erosion flux that accounts for the effects of sediment-induced stratification in the water column. Owing to difficulties in measuring the bed shear stress b and the erosive shear strength s, we suggest a series of methods that combine laboratory and numerical experiments. A simplified turbulent transport model that includes these effects helps to quantify b and s. Focusing on soft stratified beds, the present study considers erosion rate formulas of the form =f exp {[Tb-Ts]} where is a model constant (=1 for Gularte's (1978) formula and =1/2 for Parchure's (1984) formula). First, the bed erosive strength profile s(Z) is adjusted by forcing the turbulent transport model with measured erosion rates. Second, three procedures are suggested to determine the erosion rate formula coefficients f and : a global procedure and two different layer-by-layer procedures. Each procedure is applied to an erosion experiment conducted in a rotating annular flume by Villaret and Paulic (1986). The use of the layer-by-layer procedure based on a least squares fitting technique provides a closer fit than the global procedure. The present study points out the complementarity of experimental and numerical approaches and also suggests possible improvements in laboratory test procedures. 相似文献
9.
Hydrocyclones are widely used in the mining and chemical industries. An attempt has been made in this study, to develop a CFD (computational fluid dynamics) model, which is capable of predicting the flow patterns inside the hydrocyclone, including accurate prediction of flow split as well as the size of the air-core. The flow velocities and air-core diameters are predicted by DRSM (differential Reynolds stress model) and LES (large eddy simulations) models were compared to experimental results. The predicted water splits and air-core diameter with LES and RSM turbulence models along with VOF (volume of fluid) model for the air phase, through the outlets for various inlet pressures were also analyzed. The LES turbulence model led to an improved turbulence field prediction and thereby to more accurate prediction of pressure and velocity fields. This improvement was distinctive for the axial profile of pressure, indicating that air-core development is principally a transport effect rather than a pressure effect. 相似文献
10.