We study the properties of a model system that exhibits a transition between ferromagnetic and helical order at a Lifshitz point, as interaction parameters R and S compete.neighbour and next-nearest-neighbour spin pairs respectively in the z direction, and J,, is a nearest-neighbour interaction between spin pairs in each xy plane. We calculate the high-temperature susceptibility series to order...

Title of Dissertation: ACTIVE CONTROL OF SOUND TRANSMISSION INTO THREE-DIMENSIONAL ENCLOSURES Moustafa Al-Bassyiouni, Doctor of Philosophy, 2004 Dissertation directed by: Professor B. Balachandran Department of Mechanical Engineering The aim of this dissertation work is to understand active control of sound fields inside a three-dimensional rectangular enclosure into which noise is transmitted ...

Ceramic/fiber composite armor is a hot research topic of bulletproof equipment. The lightweight design ceramic materials and structures has attracted much attention. In this work, in the light remarkable performance against elastic oblique penetration, novel honeycomb panel with hexagonal prism spherical body was designed. splicing ceramic/fiber plate bonded PE plate. prepared, target test cond...

in this paper, we propose to extend the hierarchical bivariatehermite interpolant to the spherical case. let $t$ be an arbitraryspherical triangle of the unit sphere $s$ and  let $u$ be a functiondefined over the triangle $t$. for $kin mathbb{n}$, we consider ahermite spherical interpolant problem $h_k$ defined by some datascheme $mathcal{d}_k(u)$ and which admits a unique solution $p_k$in the ...

in hilbert space l2(rn), we prove the equivalence between the mod-ulus of smoothness and the k-functionals constructed by the sobolev space cor-responding to the fourier transform. for this purpose, using a spherical meanoperator.

the flame propagation through a coal dust-air mixture in a spherical vessel was studied by means of a one-dimensional, arrhenius-type kinetics and quasi-steady model. the model includes the evaporation of the volatile matter of dust particles into a known gaseous fuel (methane) and the single-stage reaction of the gas-phase combustion. effect of venting devices as safety idea and the radiation ...

the combined effect of hydrostatic pressure and temperature on correlation energy in a triplet state of two electron spherical quantum dot with square well potential is computed. the result is presented taking gaas dot as an example. our result shows the correlation energies are i)negative in the triplet state contrast to the singlet state ii) it increases with increase in pressure  iii)further...