全文获取类型
收费全文 | 884篇 |
免费 | 120篇 |
国内免费 | 175篇 |
专业分类
测绘学 | 196篇 |
大气科学 | 102篇 |
地球物理 | 190篇 |
地质学 | 394篇 |
海洋学 | 101篇 |
天文学 | 42篇 |
综合类 | 100篇 |
自然地理 | 54篇 |
出版年
2024年 | 9篇 |
2023年 | 8篇 |
2022年 | 17篇 |
2021年 | 25篇 |
2020年 | 32篇 |
2019年 | 40篇 |
2018年 | 34篇 |
2017年 | 57篇 |
2016年 | 37篇 |
2015年 | 28篇 |
2014年 | 44篇 |
2013年 | 50篇 |
2012年 | 57篇 |
2011年 | 57篇 |
2010年 | 50篇 |
2009年 | 41篇 |
2008年 | 45篇 |
2007年 | 57篇 |
2006年 | 46篇 |
2005年 | 46篇 |
2004年 | 35篇 |
2003年 | 44篇 |
2002年 | 32篇 |
2001年 | 24篇 |
2000年 | 28篇 |
1999年 | 31篇 |
1998年 | 21篇 |
1997年 | 21篇 |
1996年 | 26篇 |
1995年 | 20篇 |
1994年 | 25篇 |
1993年 | 14篇 |
1992年 | 11篇 |
1991年 | 12篇 |
1990年 | 16篇 |
1989年 | 19篇 |
1988年 | 5篇 |
1987年 | 8篇 |
1986年 | 5篇 |
1985年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有1179条查询结果,搜索用时 375 毫秒
101.
差分VLBI测量的一种实现方案 总被引:1,自引:0,他引:1
差分VLBI通过交替观测目标天体和参考天体,将共同的误差因素从观测量中扣除,能够实现高精度的相对定位,因而在深空探测中有重要作用.然而,差分VLBI高精度的实现要求目标天体和参考天体的角距很近,这大大限制了其应用.讨论设计了差分VLBI测量的一种实现方案,利用多颗参考源的观测内插出目标源的非几何时延修正,放宽了对目标源和参考源的角距限制.该方案在S波段对目标源非几何时延的修正精度可以达到1 ns水平. 相似文献
102.
Inverse Analysis of Deep Excavation Using Differential Evolution Algorithm 总被引:1,自引:0,他引:1
下载免费PDF全文
![点击此处可从《国际地质力学数值与分析法杂志》网站下载免费的PDF全文](/ch/ext_images/free.gif)
This paper presents the applications of the differential evolution (DE) algorithm in back analysis of soil parameters for deep excavation problems. A computer code, named Python‐based DE, is developed and incorporated into the commercial finite element software ABAQUS, with a parallel computing technique to run an FE analysis for all trail vectors of one generation in DE in multiple cores of a cluster, which dramatically reduces the computational time. A synthetic case and a well‐instrumented real case, that is, the Taipei National Enterprise Center (TNEC) project, are used to demonstrate the capability of the proposed back‐analysis procedure. Results show that multiple soil parameters are well identified by back analysis using a DE optimization algorithm for highly nonlinear problems. For the synthetic excavation case, the back‐analyzed parameters are basically identical to the input parameters that are used to generate synthetic response of wall deflection. For the TNEC case with a total of nine parameters to be back analyzed, the relative errors of wall deflection for the last three stages are 2.2, 1.1, and 1.0%, respectively. Robustness of the back‐estimated parameters is further illustrated by a forward prediction. The wall deflection in the subsequent stages can be satisfactorily predicted using the back‐analyzed soil parameters at early stages. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
103.
104.
Frost heave is an upward swelling of soil during cryogenic conditions in cold regions. It is caused by the accumulation of ice crystals in subgrade soil, which grow upwards when freezing temperatures penetrate into the subgrade. This study establishes the allowable soil subgrade frost heave based on the roughness standard of asphalt pavement in China, and aims to balance the pavement design and frost heave resistance of subgrades in cold regions. We formulated a mechanical model of pavement supported by the boundary conditions of differential frost heave, based on the elastic layered system theory. The differential soil subgrade frost heave was modeled as a sinusoidal function, and the allowable frost heave and the roughness index were modeled as the displacement boundaries for the top and bottom of the pavement structure. Then the allowable frost heave was back-calculated according to the roughness standard. Numerical results show that the allowable frost heave depends on the pavement structure, material properties, the highway grade, and other factors. In order to ensure that the actual soil subgrade frost heave is lower than the allowable frost heave, pavement structures and materials need to be selected and designed carefully. The numerical method proposed here can be applied to establish the frost heave resistance of subgrade when the pavement structure and materials are determined. 相似文献
105.
根据大气水平运动方程推导出Ekman层风速随高度分布方程,该分布可用二阶线性微分方程表示,用有限差分法求解该二阶线性微分方程的边值问题的数值解,并给出计算程序,输出结果。将结果与经典解析解比较,讨论了经典解的正确性和适用范围。 相似文献
106.
We present a time-transformed leapfrog scheme combined with the extrapolation method to construct an integrator for orbits in N-body systems with large mass ratios. The basic idea can be used to transform any second-order differential equation into a form which may allow more efficient numerical integration. When applied to gravitating few-body systems this formulation permits extremely close two-body encounters to be considered without significant loss of accuracy. The new scheme has been implemented in a direct N-body code for simulations of super-massive binaries in galactic nuclei. In this context relativistic effects may also be included. 相似文献
107.
Chen Jin ling 《成都信息工程学院学报》1989,(2)
本文简单介绍了LVDT、相敏检波器和三角波发生器的工作原理及自行设计的一种实用的LVDT相敏检波读出电路。 相似文献
108.
董黎明,李向明,冯长春ASTUDYONREGIONALDIFFERENCEOFCHINA'SPAIDURBANLANDUSESYSTEMANDGRADING¥DongLiming;LiXiangming;FengChangchun(PekingUni... 相似文献
109.
110.
Martin Ostoja-Starzewski James M. Longuski 《Celestial Mechanics and Dynamical Astronomy》1992,54(4):295-303
The problem of errant rocket burns in low Earth orbit is of growing interest, especially in the area of safety analysis of nuclear powered spacecraft. The development of stochastic Hill's equations provides a rigorous mathematical tool for the study of such errant rocket maneuvers. These equations are analyzed within the context of a theory of linear dynamical systems driven by a random white noise. It is established that the trajectories of an errant rocket are realizations of a Gauss-Markov process, whose mean vector is given by the solution of a deterministic rocket problem. The time-dependent covariance matrix of the process is derived in an explicit form. 相似文献