Localization of pulse signal in randomly layered medium

It is shown that in a medium with randomly layered inhomogeneities, a nonstationary pulse signal emitted by a plane (one-dimensional) source is localized in a closed region of space due to the interference of multiply scattered fields. A wave packet emitted by a point source in such a medium is channeled along the layers.Institute of Radio Physics and Electronics, Academy of Sciences of Ukraine. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 35, Nos. 3, 4, pp. 246–251, March–April, 1992.     

Method of constructing shock compression diagrams for foam plastics

A method is proposed for constructing shock compression diagrams for foam plastics based on experimental determination of the residual deformation of a specimen after impact with a rigid obstacle. An approximate diagram is obtained for expanded polystyrene PS-1 of initial density 0.21 g/cm³, and the dynamic yield strength is estimated.Moscow. Translated from Mekhanika Polimerov, Vol. 9, No. 3, pp. 566–568, May–June, 1973.     

Elektronen-Spin-Gitter- und Spin-Spin-Relaxation von Cu(II) in Ni(II)-bis(1,1-dicyanoäthylen-2,2-dithiolat)-Einkristallen

The temperature-dependence of the electron-spin-lattice- and -spin-spin-relaxation times T₁ and T₂ of Cu(II) in (Tetrabutyl-ammonium)-Ni(II)bis(1,1-dicyanoethylene-2,2-dithiolate) single crystals are reported. In the range of the direct processes (T = 2…7°K) a dependence of the spin-lattice relaxation rate on the orientation of the Cu-nuclear spin was observed. From the temperature-dependence of the RAMAN -process the DEBYE -temperature and the averaged soundvelocity of the molecular crystal have been derived being θ = (100 ± 10)°K and 〈v〉 ≈ 0.7. 10⁵ cm/sec. In order to explain the unusual small line-width of the ^63,65Cu-hyperfine structure lines of the EP R-spectrum in the investigated large temperature-range of T = 2.0…300°K the mechanisms contributing to the line width were analyzed. The possible influence of the strong covalency of the Cu-ligand bonds to T₁ is considered.