全文获取类型
| 收费全文 | 204篇 |
| 免费 | 32篇 |
| 国内免费 | 24篇 |
专业分类
| 测绘学 | 5篇 |
| 大气科学 | 6篇 |
| 地球物理 | 36篇 |
| 地质学 | 90篇 |
| 海洋学 | 2篇 |
| 综合类 | 7篇 |
| 自然地理 | 114篇 |
出版年
| 2023年 | 5篇 |
| 2022年 | 6篇 |
| 2021年 | 8篇 |
| 2020年 | 6篇 |
| 2019年 | 7篇 |
| 2018年 | 7篇 |
| 2017年 | 6篇 |
| 2016年 | 6篇 |
| 2015年 | 5篇 |
| 2014年 | 12篇 |
| 2013年 | 13篇 |
| 2012年 | 8篇 |
| 2011年 | 10篇 |
| 2010年 | 4篇 |
| 2009年 | 5篇 |
| 2008年 | 2篇 |
| 2007年 | 14篇 |
| 2006年 | 7篇 |
| 2005年 | 16篇 |
| 2004年 | 7篇 |
| 2003年 | 7篇 |
| 2002年 | 6篇 |
| 2001年 | 6篇 |
| 2000年 | 8篇 |
| 1999年 | 9篇 |
| 1998年 | 9篇 |
| 1997年 | 6篇 |
| 1996年 | 10篇 |
| 1995年 | 6篇 |
| 1994年 | 7篇 |
| 1993年 | 8篇 |
| 1992年 | 10篇 |
| 1991年 | 5篇 |
| 1990年 | 1篇 |
| 1988年 | 1篇 |
| 1987年 | 5篇 |
| 1986年 | 1篇 |
| 1979年 | 1篇 |
排序方式： 共有260条查询结果，搜索用时 15 毫秒
101.
We use Monte Carlo Markov chains to solve the Bayesian MT inverse problem in layered situations. The domain under study is divided into homogeneous layers, and the model parameters are the conductivity of each layer. We use an a priori distribution of the parameters which favours smooth models. For each layer, the a priori and a posteriori distributions are digitized over a limited set of conductivity values.
The Markov chain relies on updating the model parameters during successive scanning of the domain under study. For each step of the scanning, the conductivity is updated in one layer given the actual value of the conductivity in the other layers. Thus we designed an ergodic Markov chain, the invariant distribution of which is the a posteriori distribution of the parameters, provided the forward problem is completely solved at each step.
We have estimated the a posteriori marginal probability distributions from the simulated successive values of the Markov chain. In addition, we give examples of complex magnetotelluric impedance inversion in tabular situations, for both synthetic models and field situations, and discuss the influence of the smoothing parameter. 相似文献
The Markov chain relies on updating the model parameters during successive scanning of the domain under study. For each step of the scanning, the conductivity is updated in one layer given the actual value of the conductivity in the other layers. Thus we designed an ergodic Markov chain, the invariant distribution of which is the a posteriori distribution of the parameters, provided the forward problem is completely solved at each step.
We have estimated the a posteriori marginal probability distributions from the simulated successive values of the Markov chain. In addition, we give examples of complex magnetotelluric impedance inversion in tabular situations, for both synthetic models and field situations, and discuss the influence of the smoothing parameter. 相似文献
102.
电磁法综合探测系统研究 总被引：15，自引：1，他引：14
针对地下隐伏资源勘查对大深度、多参量电磁法技术的发展要求,利用天然场音频大地电磁的大深度探测及人工场激电法的多参量探测,在对分布式的场量接收和大功率的发射仪器硬件研制,以及数据处理资料解释研究基础上,成功研制了阵列天然场电磁法探测技术及混场源电磁法探测技术系统。经矿区试验应用表明,阵列天然场电磁法探测技术系统具有轻便高效大深度探测的特点,适宜于不同地貌景观尤其是困难条件下隐伏资源的大深度探测,而混场源电磁法探测技术系统不仅可获取大深度的天然场电阻率信息,还能获取人工场激电信息,可广泛应用于金属矿资源、地下水资源及油气资源的勘查。 相似文献
103.
104.
105.
R. J. Banks 《Geophysical Journal International》1998,135(2):553-563
106.
107.
In order to explore the regularity between Wanrendong gold deposit and geophysical electrical characteristics and expand thoughts for Wanrendong gold deposit prospecting, the authors comprehensively investigated the electrical structural characteristics of Wanrendong gold mine area, through the introduction of geological and physical characteristics of Wanrendong gold deposit, as well as the CSAMT (controlled source audio magnetotelluric method) basic theory and the transitivity measurement work. The spatial distribution characteristics of gold deposit-related geologic body, structure, and alteration was identified, and the prospecting geophysical rules of gold deposit were summarized in this paper. The gold deposit was mostly distributed in the geophysical low resistance anomaly areas, or transition areas between high resistance and low resistance. This method proved to be effective and dependable after later borehole certification. These achievements could provide geophysical exploration method of gold-prospecting for Wamrendong gold deposit area or similar areas. 相似文献
108.
109.
介绍了DAB(数字音频广播)主业务信息通道的传输结构及其作用,提出了一种应用于DAB发射机在主业务信息通道传输文字模块的设计方案.该设计针对现有DAB发送文字信息所需的多样性、实时性和经济性的要求,基于MOT(多媒体对象传输)协议传输规范,利用自适应分组模式传输机制提高了DAB发射系统发送文本信息(气象预警信息、交通信息等)的灵活性和子信道容量的利用率.该方案已通过自适应分组编码软件实现. 相似文献
110.