Collective and single-particle spin-flip excitations of a two-dimensional electron gas in a semimagnetic Cd1−xMnxTe quantum well are observed by resonant Raman scattering. Application of a magnetic field splits the spin-subbands and a spin-polarization is induced in the electron gas. Above some critical field, a collective spin-flip mode, which disperses with in-plane wave vector, dominates the...

It is shown that the interaction of helicity-1 waves of gravity and matter in a thin slab configuration produces new types of instabilities. Indeed, a spin2 helicity-1 mode interacts strongly with the shear motion of matter. This mode is unstable above a critical wavelength, λc = √ πc2/2Gρ. This should be compared with Jeans wavelength, λJ = √ πcs/Gρ, where cs is the sound speed. The two instab...

In the present research, free vibration and modal stress analyses of thin circular plates with arbitrary edge conditions, resting on two-parameter elastic foundations are investigated.  Both Pasternak and Winkler parameters are adopted to model the elastic foundation. The differential transform method (DTM) is used to solve the eigenvalue equation yielding the natural frequencies and mode shape...

This paper describes a 158 MS/s JPEG 2000 codec with an embedded block coder (EBC) based on a bit−plane and pass−parallel architecture. The EBC contains bit−plane coders (BPCs) corresponding to each bit−plane in a code−block. An upper BPC transfers significance states and sign bits to a lower BPC via a first−in−first−out buffer (FIFO) to synchronize BPCs themselves. The upper and the lower bit−...

the current study presents a new analytical method for buckling analysis of circular plates with constant thickness and poisson’s ratio, made of functionally graded material subjected to radial load. governing equations are based on energy method for thin plates. the boundary conditions of the plate are assumed to be simply supported and clamped. the stability equations were obtained by using c...

With the aim of achieving stable operation of circular saws, this study finds the solution for the optimization problem that involves choosing a set of tensioning parameters in a rotating circular saw that is subjected to both a local temperature distribution and the in-plane plastic strain over a double annular domain. The solution for the in-plane forces is obtained on the basis of plate bend...

New insight on mode coupling in waveguiding structures is obtained from the theory of Morse critical points (MCP’s). It is shown that the traditional coupled-mode formalism has a clear analytical connection with functional properties of the characteristic determinant in the vicinity of the Morse critical point, which determines the minimum of coupling. The relationship between perturbed and ind...