نتایج جستجو برای: geophysical technique

تعداد نتایج: 620629  

2006
J. ASFAHANI

A new and simple method based on constrained nonlinear programming concepts is being proposed in this research to interpret the self-potential (SP) anomaly due to two-dimensional inclined sheets of finite depth extent. A constrained nonlinear model has been formulated to describe the geophysical problem related to this buried inclined structure. Thereafter this model has been solved by the famo...

2004
B. L. N. Kennett

Both geophysical and geochemical techniques contribute to our understanding of the complex nature of the Earth’s mantle, but the two sources of information provide very different viewpoints. Most geophysical evidence provides an instantaneous snapshot of current structure, whilst geochemical evidence has much more information on age. Further, geophysical probes are naturally integrative since t...

Journal: :J. Spatial Information Science 2013
Annalisa Appice Anna Ciampi Donato Malerba Pietro Guccione

Ubiquitous sensor stations continuously measure several geophysical fields over large zones and long (potentially unbounded) periods of time. However, observations can never cover every location nor every time. In addition, due to its huge volume, the data produced cannot be entirely recorded for future analysis. In this scenario, interpolation, i.e., the estimation of unknown data in each loca...

2017
Guilherme S. Rosa

In this paper we present an efficient mode-matching technique to analyze tilted-coil antennas in anisotropic geophysical formations. In this problem, a number of coil antennas with arbitrary relative tilt angle with respect to the symmetry axis are used to radiate electromagnetic fields in a cylindrically layered medium comprised of a metallic mandrel, a borehole, and a surrounding layered Eart...

2000
Shinsuke Nakao Julie Najita Kenzi Karasaki

Ž . Ž . Cluster variable aperture CVA simulated annealing SA is an inversion technique to construct fluid flow models in fractured rocks based on the transient pressure data from hydraulic tests. A two-dimensional fracture network system is represented as a filled regular lattice of fracture elements. The algorithm iteratively changes element apertures for a cluster of fracture elements in orde...

Journal: :زمین شناسی اقتصادی 0

introduction tekieh lead-zinc ore deposit that is located in the sanandaj-sirjan structural zone has been recognized as one of the most important mineralized regions in malayer-isfahan metallogenic sub-state, south east of arak (momenzadeh and ziseman, 1981). carbonate host units have been developed along (or across) the vishan-tekieh anticline as the main structure extended in nw-se trends (an...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه گیلان - دانشکده علوم انسانی 1391

the present study sought to investigate the impact of using mind-mapping technique instruction on female elementary efl learners reading comprehension; it also investigated their attitudes towards using mind-mapping technique as a tool to improve their reading comprehension. this study followed a quasi-experimental design with two intact groups as experimental, and control groups. the participa...

Journal: :Remote Sensing 2017
Julián Martínez Violeta Montiel Javier Rey Francisco J. Cañadas-Quesada Pedro Vera-Candeas

Low yields in ornamental rock mining remain one of the most important problems in this industry. This fact is usually associated with the presence of anisotropies in the rock, which makes it difficult to extract the blocks. An optimised planning of the exploitation, together with an improved geological understanding of the deposit, could increase these yields. In this work, marble mining in Mac...

2003
Daniel Castaño Angela Kunoth

In [3] an adaptive method to approximate unorganized clouds of points by smooth surfaces based on wavelets has been described. The general fitting algorithm operates on a coarse–to–fine basis and selects on each refinement level in a first step a reduced number of wavelets which are appropriate to represent the features of the data set. In a second step, the fitting surface is constructed as th...

Journal: :Neural networks : the official journal of the International Neural Network Society 2003
Vladimir M. Krasnopolsky Helmut Schiller

A broad class of neural network (NN) applications dealing with the remote measurements of geophysical (physical, chemical, and biological) parameters of the oceans, atmosphere, and land surface is presented. In order to infer these parameters from remote sensing (RS) measurements, standard retrieval and variational techniques are applied. Both techniques require a data converter (transfer funct...

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