The complete mol-ecules of the title compounds, N2,N5-bis-(pyridin-2-ylmeth-yl)pyrazine-2,5-dicarboxamide, C18H16N6O2 (I), 3,6-dimethyl-N2,N5-bis-(pyridin-2-yl-meth-yl)pyrazine-2,5-dicarboxamide, C20H20N6O2 (II), and N2,N5-bis-(pyridin-4-ylmeth-yl)pyrazine-2,5-dicarboxamide, C18H16N6O2 (III), are generated by inversion symmetry, with the pyrazine rings being located about centres of inversion. ...

A problem of reflection and transmission of a plane shear wave incident at a corrugated interface between transversely isotropic inhomogeneous and visco-elastic half-spaces is investigated. Applying appropriate boundary conditions and using Rayleigh’s method of approximation expressions for reflection and transmission coefficients are obtained for the first and second order approximation of the...

We have localized and identified five rat hepatocyte plasma membrane proteins using hybridoma technology in combination with morphological and biochemical methods. Three different membrane preparations were used as immunogens: isolated hepatocytes, a preparation of plasma membrane sheets that contained all three recognizable surface domains of the intact hepatocyte (sinusoidal, lateral, and bil...

We propose a new transient model which naturally extends the sinusoidal model to nonstationary phenomena. An integrated online-offline segmentation approach is developed, followed by an explicitly time-variant sinusoidal model.

1. In Fennoscandia during winter small rodents spend most of their time in the subnivean space, between the snow cover and the ground. The subnivean space is probably not a uniform habitat, but broken into accessible and inaccessible patches by ice covering the vegetation. This might reduce access to otherwise available food resources. 2. To test whether ice formations reduce access to food and...

The object of research is the processes emergence, perception, and redistribution loads in body a universal railroad gondola with cladding corrugated sheets. To improve strength sheets cladding, it proposed to strengthen most loaded area terms height (1/3 bottom tie-up) horizontal corrugations. Determination geometric parameters corrugation carried out by moment resistance sheet. dynamic load i...

this paper presents a finite element analysis and its related experimental test of corrugated steel web beams subjected to fatigue loading. a particular focus in this study was set on the fatigue failure arising from the web-to-flange welded joint of the corrugated steel web beam. a detailed three-dimensional finite element model which explicitly includes the geometry of the web-to-flange welds...