Generalized normal form and the formal equivalence of systems with zero approximation (x 2 3 , — x 1 3 )

We consider formal systems of differential equations of the form

Coherence and superconductivity in coupled one-dimensional chains: a case study of YBa2Cu3Oy

We report the infrared (IR) response of Cu-O chains in the high-T(c) superconductor YBa(2)Cu(3)O(y) over the doping range spanning y=6.28-6.75. We find evidence for a power law scaling at mid-IR frequencies consistent with predictions for Tomonaga-Luttinger liquid, thus supporting the notion of one-dimensional transport in the chains. We analyze the role of coupling to the CuO2 planes in establishing metallicity and superconductivity in disordered chain fragments.     

Monomerization of dicyclopentadiene and hydrogenation of cyclopentadiene in a stream of methane over palladium-ruthenium alloy

Russian Chemical Bulletin -     

Optical properties of III-Mn-V ferromagnetic semiconductors

We review the first decade of extensive optical studies of ferromagnetic, III-Mn-V diluted magnetic semiconductors. Mn introduces holes and local moments to the III–V host, which can result in carrier mediated ferromagnetism in these disordered semiconductors. Spectroscopic experiments provide direct access to the strength and nature of the exchange between holes and local moments; the degree of itineracy of the carriers; and the evolution of the states at the Fermi energy with doping. Taken together, the diversity of optical methods reveal that Mn is an unconventional dopant, in that the metal to insulator transition is governed by the strength of the hybridization between Mn and its p-nictogen neighbor. The interplay between the optical, electronic and magnetic properties of III-Mn-V magnetic semiconductors is of fundamental interest and may enable future spin-optoelectronic devices.     

Comparative estimate of the molding capacities of injection molding machines with plunger and screw plastication

An analysis of the mold filling process, based on the equation of nonisothermal flow of an amorphous polymer melt, shows that for thin moldings the molding capacity of the machine, estimated as the maximum shot length, has a limit that does not depend on the pressure at the mold inlet and is determined by the flow rate of the polymer in the mold. As shown by an analysis of the process of compaction of the polymer in the system preceding the mold, this flow rate is many times less for plunger plastication, which is responsible for the reduced molding capacity of plunger machines. The effect can be eliminated by compressing the polymer before injecting it into the mold.Moscow Institute of Chemical Machine Building. Translated from Mekhanika Polimerov, No. 2, pp. 367–372, March–April, 1970.     

Plasmonic tuning of aluminum doped zinc oxide nanostructures by atomic layer deposition

Currently there is a strong interest in plasmonic materials operating in the near‐infrared (NIR), however, conventional metals such as gold and silver possess high optical losses in this region. In this work we demonstrate localized surface plasmon resonances (LSPRs) with low loss in the NIR region by utilizing atomic layer deposition to deposit thin films of aluminium doped zinc oxide onto silicon nanopillars created via nanopshere lithography. The deposited films have excellent conformality and the LSPRs can be tuned from the mid‐infrared to the NIR by controlling the doping concentration, deposition temperature and nanostructure morphology. (© 2014 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)     

Generalized normal forms for two-dimensional systems of ordinary differential equations with linear and quadratic unperturbed parts

Various definitions of normal forms for systems of ordinary differential equations are discussed. The notion of a generalized normal form and the problem of formal equivalency of systems of differential equations in terms of resonant equations are considered. The method of resonant equations is applied to two-dimensional systems whose unperturbed parts are linear in the first equation and quadratic in the second one.