全文获取类型
收费全文 | 2544篇 |
免费 | 320篇 |
国内免费 | 357篇 |
专业分类
测绘学 | 1236篇 |
大气科学 | 542篇 |
地球物理 | 347篇 |
地质学 | 373篇 |
海洋学 | 239篇 |
天文学 | 62篇 |
综合类 | 315篇 |
自然地理 | 107篇 |
出版年
2024年 | 3篇 |
2023年 | 19篇 |
2022年 | 42篇 |
2021年 | 69篇 |
2020年 | 94篇 |
2019年 | 86篇 |
2018年 | 68篇 |
2017年 | 114篇 |
2016年 | 130篇 |
2015年 | 148篇 |
2014年 | 157篇 |
2013年 | 201篇 |
2012年 | 180篇 |
2011年 | 211篇 |
2010年 | 143篇 |
2009年 | 156篇 |
2008年 | 149篇 |
2007年 | 178篇 |
2006年 | 168篇 |
2005年 | 129篇 |
2004年 | 99篇 |
2003年 | 82篇 |
2002年 | 76篇 |
2001年 | 66篇 |
2000年 | 38篇 |
1999年 | 43篇 |
1998年 | 80篇 |
1997年 | 47篇 |
1996年 | 44篇 |
1995年 | 35篇 |
1994年 | 31篇 |
1993年 | 24篇 |
1992年 | 24篇 |
1991年 | 14篇 |
1990年 | 16篇 |
1989年 | 18篇 |
1988年 | 10篇 |
1987年 | 8篇 |
1986年 | 7篇 |
1985年 | 3篇 |
1984年 | 6篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1954年 | 1篇 |
排序方式: 共有3221条查询结果,搜索用时 171 毫秒
51.
An adaptive substepping explicit integration scheme is developed for a porosity‐dependent hydro‐mechanical model for unsaturated soils. The model is referred to as the modified σ –Θ model in this paper, which features the employment of the subloading surface plasticity and the stress–saturation approach. On numerical aspects, convex/nonconvex subloading surfaces in the σ –Θ space may result in incorrect loading–unloading decisions during the integration. A new loading–unloading decision method is developed here to solve the problem and then embedded into the explicit integration scheme for the modified σ –Θ model. In addition, to enhance the accuracy of the explicit integration, local errors from both hydraulic and mechanical components are included in the error control for each substep. A drift correction method is also developed to ensure the state point lies on the subloading surface in the σ –Θ space within a set error level. The performance of the loading–unloading decision method for the modified σ –Θ model is discussed through comparing it with the conventional loading–unloading decision method. The importance of involving the hydraulic component in the error control is also demonstrated. The accuracy and efficiency of the proposed adaptive substepping explicit integration scheme for the modified p–Θ model are also studied via several numerical examples. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
52.
Numerical modeling of toxic nonaqueous phase liquid removal from contaminated groundwater systems: mesh effect and discretization error estimation 下载免费PDF全文
Numerical modeling has now become an indispensable tool for investigating the fundamental mechanisms of toxic nonaqueous phase liquid (NAPL) removal from contaminated groundwater systems. Because the domain of a contaminated groundwater system may involve irregular shapes in geometry, it is necessary to use general quadrilateral elements, in which two neighbor sides are no longer perpendicular to each other. This can cause numerical errors on the computational simulation results due to mesh discretization effect. After the dimensionless governing equations of NAPL dissolution problems are briefly described, the propagation theory of the mesh discretization error associated with a NAPL dissolution system is first presented for a rectangular domain and then extended to a trapezoidal domain. This leads to the establishment of the finger‐amplitude growing theory that is associated with both the corner effect that takes place just at the entrance of the flow in a trapezoidal domain and the mesh discretization effect that occurs in the whole NAPL dissolution system of the trapezoidal domain. This theory can be used to make the approximate error estimation of the corresponding computational simulation results. The related theoretical analysis and numerical results have demonstrated the following: (1) both the corner effect and the mesh discretization effect can be quantitatively viewed as a kind of small perturbation, which can grow in unstable NAPL dissolution systems, so that they can have some considerable effects on the computational results of such systems; (2) the proposed finger‐amplitude growing theory associated with the corner effect at the entrance of a trapezoidal domain is useful for correctly explaining why the finger at either the top or bottom boundary grows much faster than that within the interior of the trapezoidal domain; (3) the proposed finger‐amplitude growing theory associated with the mesh discretization error in the NAPL dissolution system of a trapezoidal domain can be used for quantitatively assessing the correctness of computational simulations of NAPL dissolution front instability problems in trapezoidal domains, so that we can ensure that the computational simulation results are controlled by the physics of the NAPL dissolution system, rather than by the numerical artifacts. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
53.
双能X射线计算机断层成像技术(DECT)能够准确地重建物质的有效原子序数和电子密度信息,是一种有效的物质辨别技术.基材料分解法是求解DECT重建问题的主要方法之一.但目前应用此方法得到的重建结果误差较大,并且对于金属伪影抑制能力也较差.本文分析了DECT基材料分解法重建结果的误差来源和形成机制,阐释了其对金属伪影抑制作... 相似文献
54.
55.
提高气介式超声波水位计测量精度的探讨 总被引:1,自引:0,他引:1
分析了影响气介式超声波水位计水位测量精度的各种因素,提出了消除这些影响因素的对策措施。其中,对超声波水位计测量回波因距离、反射角和发射面的变化带来的误差进行了分析,提出了一种利用数字采样技术对超声波测量回波前沿进行分析补偿来提高测量精度的方法。采用该技术的气介式超声波水位计在回波信号强弱变化时,数据重复性明显提高,使较短时间的采样就可获得较好测量精度,适合野外功耗要求小而采用间歇工作的方式。 相似文献
56.
57.
减小离散误差的时频峰值滤波算法 总被引:1,自引:0,他引:1
提出减少时频峰值滤波分段点处阶跃误差的改进方法。经过研究时频峰值滤波在频率调制和时频平面峰值滤波时产生的离散误差以及尺度变换方式,发现分段点处阶跃误差与离散傅里叶变换的长度成反比,且与零点在尺度变换后产生的不确定值有关。提出基于定零点尺度变换的时频峰值滤波,在信号尺度变换时将零点变换到瞬时频率区间上的固定值,使各段时频峰值滤波零点偏移量一致,从而消除分段点处的阶跃误差。仿真实验和实际地震信号时频峰值滤波处理结果表明,改进的时频峰值滤波算法能够有效消减随机噪声,减少分段滤波在分段处的阶跃。 相似文献
58.
59.
60.
三维激光扫描点转换到工程测量坐标系时,误差来源多、类型多,目前尚没有一套完整的精度评定方法体系。本文对误差源进行分析,将其误差归纳为标准控制点测量误差、扫描误差和坐标转换模型误差三大类;探讨了扫描点在工程测量坐标系中的位置误差指标体系,给出了体系中各项精度指标的计算方法,为三维激光扫描测量在不同的应用中提供一套系统的精度评定参考。 相似文献