نتایج جستجو برای: vector wave functionsvwf
تعداد نتایج: 409708 فیلتر نتایج به سال:
accurate permeability estimation has always been a concern in determining flow units, assigning appropriate capillary pressure andrelative permeability curves to reservoir rock types, geological modeling, and dynamic simulation.acoustic method can be used as analternative and effective tool for permeability determination. in this study, a four-step approach is proposed for permeability estimati...
ساختارهای مزوسکوپیک شامل لایه های فرومغناطیس و ابررسانا مورد توجه زیادی قرار گرفته اند. این ساختارها همبستگی کوانتومی بین آثار همدوسی در فلز عادی یا فرومغناطیس و همدوسی ذاتی ابررسانایی را که توسط بازتاب آندریو تامین می شود، به نمایش می گذارند. در این پایان نامه رسانندگی تونلی یک پیوند ابررسانای نوع-p/ فلز عادی/ فرومغناطیس ( f/n/p-wave sc) بر پایه گرافن را با استفاده از معادله دیراک-بوگولیوبو...
This work presents a comprehensive analysis of electromagnetic wave propagation inside a two-dimensional photonic crystal in a spectral region in which the crystal behaves as an effective medium to which a negative effective index of refraction can be associated. It is obtained that the main plane wave component of the Bloch mode that propagates inside the photonic crystal has its wave vector k...
Abstract- In this article, the design of conformal antennas has been discussed using the characteristic modes (CM) method. For this purpose, the vector wave function(VWF) has been utilized to achieve a two-dimensional mapping of the conformal antenna. In designing and analyzing of cone-shaped antennas applicable for multi-input multi-output (MIMO) systems, the most important goal is to achieve ...
In the case of a source-free plane-layered elastic medium, and for direct rays, the formal series ‘solution’ of the elastic equations in inverse powers of frequency can be obtained to any desired order by a process of integration by parts of a suitable iterate. The second iteration of the standard wave vector must be employed to ensure that all O(w-‘) terms are included in the iterative solutio...
We show that a small number of intentionally introduced defects can be used as a spectroscopic tool to amplify quasiparticle interference in 2H-NbSe2 that we measure by scanning tunneling spectroscopic imaging. We show, from the momentum and energy dependence of the quasiparticle interference, that Fermi surface nesting is inconsequential to charge density wave formation in 2H-NbSe2. We demonst...
The Peierls instability in multichannel metal nanowires is investigated. Hyperscaling relations are established for the finite-size, temperature, and wave-vector scaling of the electronic free energy. It is shown that the softening of surface modes at wave vector q=2kF, leads to critical fluctuations of the wire’s radius at zero temperature, where kF, is the Fermi wave vector of the highest occ...
Momentum and spin represent fundamental dynamic properties of quantum particles and fields. In particular, propagating optical waves (photons) carry momentum and longitudinal spin determined by the wave vector and circular polarization, respectively. Here we show that exactly the opposite can be the case for evanescent optical waves. A single evanescent wave possesses a spin component, which is...
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