全文获取类型
收费全文 | 105篇 |
免费 | 4篇 |
国内免费 | 2篇 |
专业分类
测绘学 | 4篇 |
大气科学 | 4篇 |
地球物理 | 26篇 |
地质学 | 32篇 |
海洋学 | 23篇 |
天文学 | 6篇 |
自然地理 | 16篇 |
出版年
2021年 | 1篇 |
2020年 | 1篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2016年 | 6篇 |
2014年 | 5篇 |
2013年 | 12篇 |
2012年 | 8篇 |
2011年 | 10篇 |
2010年 | 4篇 |
2009年 | 2篇 |
2008年 | 7篇 |
2007年 | 8篇 |
2006年 | 10篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 1篇 |
2002年 | 4篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1999年 | 1篇 |
1997年 | 5篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1980年 | 1篇 |
排序方式: 共有111条查询结果,搜索用时 15 毫秒
81.
A Numerical Framework for Modeling Folds in Structural Geology 总被引:1,自引:1,他引:0
A numerical framework for modeling folds in structural geology is presented. This framework is based on a novel and recently published Hamilton–Jacobi formulation by which a continuum of layer boundaries of a fold is modeled as a propagating front. All the fold classes from the classical literature (parallel folds, similar folds, and other fold types with convergent and divergent dip isogons) are modeled in two and three dimensions as continua defined on a finite difference grid. The propagating front describing the fold geometry is governed by a static Hamilton–Jacobi equation, which is discretized by upwind finite differences and a dynamic stencil construction. This forms the basis of numerical solution by finite difference solvers such as fast marching and fast sweeping methods. A new robust and accurate scheme for initialization of finite difference solvers for the static Hamilton–Jacobi equation is also derived. The framework has been integrated in simulation software, and a numerical example is presented based on seismic data collected from the Karama Block in the North Makassar Strait outside Sulawesi. 相似文献
82.
The heat flow content in vitrinite reflectance (VR) observations is studied based on a simple model of burial at a constant
rate. The model is made dimensionless, and it has just one parameter except for the paleo heat flow. The question of existence
and uniqueness of a solution is studied, and there exist in general no paleo heat flow that will reproduce a given VR-depth
curve. But a solution is unique if it exists. A computed VR-depth function is shown to be smooth, even for piecewise constant
heat flow histories. The paleo heat flow can be obtained from a VR-depth function after two times with derivations. It is
also shown how the present day thermal gradient can be obtained by derivation of a VR-depth representation. The one-parameter
model allows for approximate expressions for the optimal paleo heat flow as a step function. The results obtained from the
one-parameter model is also compared with similar results from a real case study from the North Sea using a state-of-the-art
basin simulator. 相似文献
83.
Pressure and temperature evolution in sedimentary basins 总被引:1,自引:0,他引:1
Magnus Wangen 《Geophysical Journal International》1992,110(3):601-613
84.
85.
正1Swedish Meteorological and Hydrological Institute, Folkborgsv?gen 17, 60361 Norrk?ping, Sweden2Norwegian Meteorological Institute, Henrik Mohns Plass 1, 0371 Oslo, Norway 相似文献
86.
Worldwide status and perspective on gadoid culture 总被引:3,自引:2,他引:3
87.
The chlorophyll-a concentration is generally overestimated for the southern China coastalwaters if the default algorithm of the SeaDAS is employed. An algorithm is developed for retrieval of chlorophyll-a concentration in the Zhujiang Estuary, Guangdong Province, China, by using simulated reflectance data. The simulated reflectance is calculated corresponding to the SeaWiFS wavelength bands, via a general model by inputting measured water components, i.e. , the suspended sediment, chlorophyll-a, and yellow substance (DOC) concentration data of 130 samples. Empirical relationships of the chlorophyll-a concentration to 240 different band combinations are investigated based on the simulated reflectance data, and the band combination, R_5R_6/R_3R_4, is found to be the optimum one for the development of an algorithm valid for the Zhujiang Estuary. This algorithm is then employed to determine the chlorophyll-a concentration from SeaWiFS data. The estimated concentrations have a better accuracy than those obtai 相似文献
88.
89.
90.
O. Magnus Karlsson J. Mikael Malmaeus Sarah Josefsson Karin Wiberg Lars Håkanson 《Estuarine, Coastal and Shelf Science》2010
A dynamical, process-based mass-balance model was applied to quantify the transports of polychlorinated-p-dibenzodioxins and dibenzofurans (PCDD/Fs) to, within and from the Kallrigafjärden Bay, a coastal estuary in the Baltic Sea, and to predict the PCDD/F levels in the water and sediments of the bay. Before the modelling, a one-year sampling programme was implemented in 2007–2008 to measure the flows of PCDD/Fs in tributaries entering the system, the fluxes from the adjacent sea and the levels in water, sediment and fish within the estuary. The collected data set was used as input data to the model and for validation purposes. 相似文献