we will present a detailed investigation of intersubband transitions process in core-multi shells quantum dots. the confined wave functions and eigenenergies of electrons in quantum dots have been calculated under the effective-mass approximation by solving a three-dimensional schrodinger equation. excellent dependence is found between size effects, time relaxation and degenerate four wave mixi...

In this paper, the two-dimensional Benney system describing long wave propagation of a finite depth fluid motion and the multi-dimensional Russo-Smereka kinetic equation describing a bubbly flow are considered. The Hamiltonian approach established by J. Gibbons for the one-dimensional Vlasov kinetic equation is extended to a multi-dimensional case. A local Hamiltonian structure associated with ...

background: organophosphorus pesticides are one of the most prevalent usages for pest control in the country. such pesti­cides enter into water sources by different routes. since drinking of contaminated water at the higher doses than the standard level, may causes undesirable effects to human health and ecosystem. the object of this research was to investigate the ef­fect of various parameters...

Wang, S. 2017. Finite Difference and Discontinuous Galerkin Methods for Wave Equations. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1522. 53 pp. Uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-554-9927-3. Wave propagation problems can be modeled by partial differential equations. In this thesis, we study wave propagation in fluids and...

We employ the Gross-Pitaevskii equation to study acoustic emission generated in a uniform Bose gas by static impurity. The impurity excites sound-wave packet, which propagates through gas. calculate shape of this wave packet limit long lengths, and argue that it is possible extract properties observing shape. illustrate here possibility for with trapped atom -- an example relevant experimental ...

Repeated simulation of large scale wave propagation problems are prevalent in many fields. In oil exploration imaging problems the use of full wave simulations is becoming routinary and it is only hampered by the extreme computational resources required. In this contribution we study the feasibility of employing model order reduction techniques for the wave equation, in an attempt to decrease t...

We have demonstrated experimentally the existence of a giant frequency down-conversion of the translational oscillatory motion of individual submillimeter acoustic bubbles in water in the presence of a high frequency (500 kHz) ultrasonic standing wave. The frequency of the translational oscillations (~170 Hz) is more than three orders of magnitude smaller than that of the driving acoustic wave....

For the Schumacher model and Adachi–Sato model, which are effective physical models of wind instruments, present study introduces a more precise sound field expression using three-dimensional wave equation, instead one-dimensional analytical solutions instrument bore. The around bell section is expressed by normally differentiated Kirchhoff–Huygens formula, then boundary element method applied ...

We consider an undetermined coefficient inverse problem for a nonlinear partial differential equation describing high-intensity ultrasound propagation as widely used in medical imaging and therapy. The usual term the standard model using Westervelt pressure formulation is of form ppt. However, this should be considered low-order approximation to more complex physical where higher order terms wi...