Mean-square asymptotic stability of linear hereditary systems

A sufficient condition is given for the mean-square asymptotic stability of the trivial solution of time-homogeneous stochastic linear functional differential equations. We use the stochastic Lyapunov function method and the resulting condition is, in some sense, an extension of the condition for linear ordinary differential equations. This condition is especially useful for equations with small noise and small delays and/or small delay terms. Some extensions for the time-inhomogeneous case are also discussed.     

Fine structure and development of the collar enamel in gars, , Actinopterygii

The fine structure of collar enamel and the cells constituting the enamel organ during amelogenesis in Lepisosteus oculatus was observed by light, scanning electron and transmission electron microscopy. In the enamel, slender crystals were arranged perpendicular to the surface and the stripes that were parallel to the surface were observed, suggesting that the enamel in Lepisosteus shares common morphological features with that in sarcopterygian fish and amphibians. Ameloblasts containing developed Golgi apparatus, rough endoplasmic reticulum (rER) and secretory granules were found in the secretory stage. In the maturation stage, a ruffled border was not seen at the distal end of the ameloblasts, while many mitochondria and lysosome-like granules were obvious in the distal cytoplasm. The enamel organ consisted of the outer dental epithelial cells, stratum reticulum cells and ameloblasts, but there was no stratum intermedium. It is likely that the ameloblasts have less absorptive function in comparison with the inner dental epithelial cells facing cap enameloid.     

俄罗斯SVDK 9mm狙击步枪

I俄罗斯SVDK gnlrn狙击步枪发射91llm SN狙击步枪专用弹,弹匣容弹量10发,用于填补7 .62Inlll和12 .7Inln狙击步枪之间的火力空白。9枪专用弹的实际尺寸为9 .3 x 64lllln。二犷唾汾卜俄罗斯SVDK 9mm狙击步枪@SASAGAWA~~