Ongoing control of the transverse thickness fluctuation of cold-rolled high-strength strip

Minimization of the transverse thickness fluctuation is considered, in the production of cold-rolled strip from a blank of multiple-strip width on a five-cell 630 mill. The forces and torques in the multipass rolling of strip produced from intermediate strip with an asymmetric cross section are determined.     

Electrochemical synthesis of phosphine from the lower phosphorus acids

We have studied the reduction of hypophosphorous and phosphorous acids at mercury and lead cathodes and with potassium and sodium amalgams. Both acids are found to be difficult to reduce. With the mercury cathode, the current efficiency for phosphine is within 2.5%. The phosphine yield with the Pb cathode can be raised by adding sulfuric acid or ethylene glycol to the catholyte.     

Features of surface modes in metamaterial layers

In this paper, we present a study of the waveguiding properties of metamaterial layers. We pay particular attention to peculiar features that have not yet been given sufficient consideration in previous publications, with an emphasis on the physical interpretation of these results. We attempt to follow the transition of waves guided by a solitary “metamaterial–vacuum” boundary (the so-called true surface wave—TSW) to modes guided by the metamaterial layer. We considered the way TSW of different types (forward, backward and degenerated) transform to the layer modes and examined the features arising in the dispersion curves. For example, “pulling” of the dispersion curve into the frequency region where TSWs do not exist separately, presence of the bend for all modes produced by backward TSWs, existence of the waves with complex conjugate propagation constants, etc.     

Sensitized anti-stokes luminescence centers in AgCl crystals

In the AgCl microcrystals with adsorbed methylene blue dye molecules, sensitized anti-Stokes luminescence centers formed as a result of a photostimulated low-temperature (77 K) process are observed. The emission is recorded on excitation of the samples by radiation with the flux density 10¹⁴?10¹⁵ photon cm^?2 s^?1 in the spectral range 620–750 nm corresponding to optical absorption in the adsorbed dye molecules and adsorbed Ag₁, Ag₂, and Ag₃ clusters. It is shown that the anti-Stokes luminescence centers formed by photo-stimulation present (adsorbed dye molecule)—(silver subnanocluster) hybrid nanostructures, in which the bonding between the components is weak but sufficient to provide the possibility for two-photon interband transitions that occur due to transfer of the electron’s excitation energy from the dye molecule to the silver cluster with subsequent photoionization of the cluster.     

Petrographic analysis of contemporary refractory vanadium slags

Results are provided for a thorough study of a valuable variety of engineering stone, i.e. contemporary vanadium slags, that are a class of “artificial (secondary) technogenic ore” for preparing a whole range of vanadium compounds and alloys. Chemical, petrographic, x-ray phase analysis and x-ray microanalysis are used to determine the mineral (phase) composition, to study phase-by-phase distribution of elements, and to specify slag microstructure. Atemperature-time sequence is established for crystallization of spinellid and various silicates during molten slag cooling. The information obtained is necessary for obtaining the required properties of slag, and it is also interesting for the petrology of ore ultramafites. In view of the features of the mineral composition and microstructure contemporary vanadium slags are related to refractory materials (refractoriness ∼1600°C).     

Experimental study of gravitational disturbances during Solar eclipses in the Novosibirsk region

Tidal variations of gravity Δg measured with an error smaller than 1 μGal = 1·10⁻⁸ m/s² during the Solar eclipses on July 31, 1981 and August 1, 2008 with the absolute laser ballistic gravimeters developed and fabricated by the authors are presented.