We consider the possibility that a light, sterile-neutrino species νS can be produced by νe scattering during the cooling of a proto-neutron star. If we parameterize the sterile-neutrino production cross section by a parameter A as σ(νeX −→ νSX) = Aσ(νeX −→ νeX), where X is an electron, neutron, or proton, we show that A is constrained by limits to the conversion of νe to νS in the region betwe...

We prove the generalized Hyers--Ulam stability  of $n$-th order linear differential equation of the form $$y^{(n)}+p_{1}(x)y^{(n-1)}+ cdots+p_{n-1}(x)y^{prime}+p_{n}(x)y=f(x),$$ with condition that there exists a non--zero solution of corresponding homogeneous equation. Our main results extend and improve the corresponding results obtained by many authors.

En este artículo se presenta, como producto de la investigación los errores algebraicos que producen nuestros estudiantes primer semestre, una alternativa para prevenir el denominado error linealización, aparece con mucha frecuencia cuando alumnos pretenden desarrollar ejercicios requieren manipulaciones algebraicas; además, trata identificar posible fuente del y implementar utilización herrami...

For the evolution of new pearl millet hybrids with diverse cytoplasmic background suitable for specific areas and condition, there is a need for diversified CMS sources among locally adaptable lines and identification of locally adaptable restorers. The present study was undertaken to screen the male sterile and restorer lines among the crosses of five male sterile lines and thirty inbreds of p...

the main objective of this paper is to study the boundedness character, the periodicity character, the convergenceand the global stability of the positive solutions of the nonlinear rational difference equation/ , n 0,1,2,....0 01      kii n ikin i n i x  x b  xwhere the coefficients i i b , ,  together with the initial conditions ,.... , , 1 0 x x x k  are arbitrary...

Anthony M. Cundell is the director of microbiological development and statistics, Global Quality Technology, at Wyeth Pharmaceuticals, 401 N. Middletown Road, Pearl River, NY 10965-1299, tel. 845.602.2497, [email protected]. icrobial testing is conducted in the sterile pharmaceutical industry in support of sterile product development; for in-process monitoring during aseptic processing and fill...

We consider the quasilinear Kirchhoff's problem$$ u_{tt}-phi (x)||nabla u(t)||^{2}Delta u+f(u)=0 ,;; x in {mathcal{R}}^{N}, ;; t geq 0,$$with the initial conditions  $ u(x,0) = u_0 (x)$  and $u_t(x,0) = u_1 (x)$, in the case where $N geq 3, ;  f(u)=|u|^{a}u$ and $(phi (x))^{-1} in L^{N/2}({mathcal{R}}^{N})cap L^{infty}({mathcal{R}}^{N} )$ is a positive function. The purpose of our work is to ...

the effects of substituents on the symmetry and the nature of halogen bonds in [n∙∙∙x∙∙∙n]+-type systems are presented for the yc5h4n∙∙∙x∙∙∙nc5h5 (y = no2, cn, h, ch3, och3, oh, nh2, x = cl, br, i) complexes. some structural parameters, energy data and electronic properties were explored with the density functional theory (dft) calculations. in addition, electrostatic potentials were used in es...

In most crosses between closely related species of Drosophila, the male hybrids are sterile and show postmeiotic abnormalities. A series of gene expression studies using genomic approaches have found significant down regulation of postmeiotic spermatogenesis genes in sterile male hybrids. These results have led some to suggest a direct relationship between down regulation in gene expression and...