نتایج جستجو برای: energy level crossing
تعداد نتایج: 1704429 فیلتر نتایج به سال:
مرحله گذارقطع یک راهکار بسیارسودمند جهت تجزیه وتحلیل سری های زمانی تصادفی است. مادراین پایان نامه با معرفی این روش به تحقیق در مورد سری های زمانی فواصل ضربان قلب و سری زمانی شاخص بورس سهام چندشرکت وزبری سطح دررشد لایه های نازک می پردازیم. دراین روش می توان بااستفاده از تابع توزیع چگالی احتمال ?_?^+ نسبت به ? وهمچنین تابع توزیع چگالی احتمال بیشترین نقاط برخورد نسبت به مقدار شیب، تمایز قلب سالم و...
We study the existence and location of resonances a 2×2 semiclassical system coupled Schrödinger operators, in case where two electronic levels cross at some point, one them is bonding, while other anti-bonding. Considering energy just above that crossing, we find asymptotics both real parts imaginary close to such energies. This continuation our previous works considered around crossing.
We present a review of rigorous mathematical results about non– adiabatic transitions in molecular systems that are associated with avoided crossings of electron energy level surfaces. We then present a novel numerical technique for studying these transitions that is based on expansions in semiclassical wavepackets.
We investigate the transition of a quantum wave-packet through a onedimensional avoided crossing of molecular energy levels when the energy levels at the crossing point are tilted. Using superadiabatic representations, and an approximation of the dynamics near the crossing region, we obtain an explicit formula for the transition wavefunction. Our results agree extremely well with high precision...
چکیده ندارد.
the aim of this work is to understand the relation between time and place that an earthquake takes place. in order to answer this question, the modified level crossing (mlc) technique has been implemented. by studying two earthquakes, one in iran and one in california we came to the conclusion that there is a relation between time and place of an earthquake occurrence. as a matter of fact, this...
In this paper we study a dark energy model in which tachyon scalar field non-minimally coupled with kinetic energy and Gauss-Bonnet invariant. Energy density рø, pressure рø and scalar field equation of motion have been calculated and then equation of state parameter has been extracted. We have investigated the conditions required for ω=-1 crossing in such a model. It is shown that phantom divi...
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