نتایج جستجو برای: confinement pressure
تعداد نتایج: 426910 فیلتر نتایج به سال:
In this paper, we present a comparative numerical analysis to determine the refractive index of photonic crystal fibers (PCFs) by using FDFD method and used the results to evaluate the confinement losses of PCFs by considering the effects of air-hole rings in the cladding. It is shown that by increasing the wavelength, the imaginary part of refraction index rises, resulting in increase of conf...
A model is developed for the confinement and collimation of a baryon poor outflow by its surrounding medium. Both, confinement by kinetic pressure of a static corona, and confinement by the ram pressure of a supersonic wind emanating from a disk surrounding the inner source are considered. Solutions are presented for the structure of the shocked layers of deflected baryon poor jet (BPJ) and ext...
We perform numerical simulations of a two-dimensional frictional granular system under oscillatory shear confined by constant pressure. found that the undergoes dilatancy as strain increases. confirmed compaction also takes place at an intermediate amplitude for small mutual friction coefficient between particles. depends on confinement pressure while little
Calculations of the binding energy of an on-center and off-center shallow hydrogenic impurity in a GaAs quantum dot under hydrostatic pressure are presented. The variational approach within the effective mass approximation is used as the framework for this calculation. The effect of the pressure is to exert an additional confinement on the impurity inside the dot; therefore the binding energy i...
We have increased substantially the electron and ion temperatures, the electron density, and the total beta in plasmas with improved energy confinement in the Madison Symmetric Torus (MST). The improved confinement is achieved with a well-established current profile control technique for reduction of magnetic tearing and reconnection. A sustained ion temperature >1 keV is achieved with intensif...
The theory of tokamak stability to nonlinear "ballooning" displacements of elliptical magnetic flux tubes is presented. Above a critical pressure profile the energy stored in the plasma may be lowered by finite (but not infinitesimal) displacements of such tubes (metastability). Above a higher pressure profile, the linear stability boundary, such tubes are linearly and nonlinearly unstable. The...
Introduction. Dedekind has determined all groups whose subgroups are all normal (see, e.g., [5, Theorem 12.5.4]). Partially generalizing this, Wielandt showed that a finite group is nilpotent, if and only if all its subgroups are subnormal, and also if and only if all maximal subgroups are normal [5, Corollary 10.3.1, 10.3.4]. Huppert [7, Sätze 23, 24] has shown that if all 2nd-maximal subgroup...
We have reached our goal of implementing a computationally cheap algorithm for realtime rendering of realistic two-dimensional fire. The fire is simulated using computational fluid dynamics, vorticity confinement, and combustion modelling and visualized using black-body radiation. Small rotationally homogenous fires like torches and candles viewed in front are the best candidates when using thi...
Cancer can be a devastating illness causing severe debilitation and prolonged confinement to bed. It is, therefore, not unexpected that oncologists would be required to manage pressure ulcers as part of the comprehensive care of their cancer patients. The consequences of these lesions can be devastating, even fatal. Thus, the common bedsore should not be overlooked as an important clinical prob...
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