نتایج جستجو برای: inversion structures

تعداد نتایج: 497111  

Journal: :Journal of South American Earth Sciences 2017

Journal: :Genetics 2005
Agustí Munté Julio Rozas Montserrat Aguadé Carmen Segarra

The adaptive character of inversion polymorphism in Drosophila subobscura is well established. The O(ST) and O(3+4) chromosomal arrangements of this species differ by two overlapping inversions that arose independently on O(3) chromosomes. Nucleotide variation in eight gene regions distributed along inversion O(3) was analyzed in 14 O(ST) and 14 O(3+4) lines. Levels of variation within arrangem...

2000
A. I. Olayinka U. Yaramanci

The ability of a block inversion scheme, in which polygons are employed to define layers andror bodies of equal resistivity, in determining the geometry and true resistivity of subsurface structures has been investigated and a simple strategy for deriving the starting model is proposed. A comparison has also been made between block inversion and smooth inversion, the latter being a cell-based s...

2016
Peter K Morse Eric I Corwin

There are deep, but hidden, geometric structures within jammed systems, associated with hidden symmetries. These can be revealed by repeated transformations under which these structures lead to fixed points. These geometric structures can be found in the Voronoi tesselation of space defined by the packing. In this paper we examine two iterative processes: maximum inscribed sphere (MIS) inversio...

Journal: :فیزیک زمین و فضا 0
منصوره منتهایی مؤسسه ژئوفیزیک دانشگاه تهران- دانشجوی دکتری هاینریش براسه دانشگاه برلین- استاد بهروز اسکویی مؤسسه ژئوفیزیک دانشگاه تهران- استادیار

the deep internal structure of the crust can be determined using appropriate seismic and electromagnetic methods. the natural source magnetotelluric (mt) method is the most suitable electromagnetic technique for probing into the deep crust. a long period magnetotelluric data set obtained in the southern chilean andes is investigated in this paper. dimensionality analysis shows that the data may...

2008
M. Zhdanov

of the traditional smooth inversion this information is provided as [2J The two-dimensional (2-D) magnetotelluric inverse problem an assumption that the solution, the geoelectrical model in the MT has been addressed by several authors. The most well-known case, should be represented by smooth functions. At the same time, approaches are the search for a smooth model [de Groot-Hedlin in some geol...

2015
Shrey Sharma Gunjan Kumar

High density electrical prospecting has been widely used in groundwater investigation, civil engineering and environmental survey. For efficient inversion, the forward modeling routine, sensitivity calculation, and inversion algorithm must be efficient. This paper attempts to provide a brief summary of the past and ongoing developments of the method. It includes reviews of the procedures used f...

Journal: :SIAM J. Matrix Analysis Applications 2003
Siegfried M. Rump

In the second part of this paper we study condition numbers with respect to componentwise perturbations in the input data for linear systems and for matrix inversion, and the distance to the nearest singular matrix. The structures under investigation are linear structures, namely symmetric, persymmetric, skewsymmetric, symmetric Toeplitz, general Toeplitz, circulant, Hankel, and persymmetric Ha...

Journal: :فیزیک زمین و فضا 0
نازلی صبا کارشناس ارشد ژئومغناطیس، مؤسسه ژئوفیزیک دانشگاه تهران، ایران بهروز اسکویی استادیار، گروه فیزیک زمین، مؤسسة ژئوفیزیک دانشگاه تهران، ایران

two dimensional single frequency scalar vlf data modeling has been studied in this research. vlf method is one of the electromagnetic investigation methods. radio frequency waves are used for investigation of conductive deposits (paal, 1968). synthetic modeling and inversion of single frequency and multiple frequencies of vlf signals was done by oskooi (2004) for two dimensional simple structur...

Journal: :Physical Review B 2021

We characterize non-Hermitian band structures by symmetry indicator topological invariants. Enabled crystalline inversion symmetry, these indicators allow us to short-cut the calculation of conventional In particular, we express three-dimensional winding number point-gapped systems, which is defined as an integral over whole Brillouin zone, in terms eigenvalues at high-symmetry momenta. Further...

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