Reflection and transmission of Rayleigh waves in a wedge

An approximate theory of the reflection and transmission of Rayleigh waves in an elastic wedge is developed on the basis of the representation of the wedge by a system of two coupled surface-wave wave-guides. The theory is in good agreement with the existing experimental data and permits the prediction of a number of new results, which can be tested experimentally

Quasi-one-dimensional intermittent flux behavior in superconducting films

Intermittent filamentary dynamics of the vortex matter in superconductors is found in films of YBa2Cu3O7-δ deposited on tilted substrates. Deposition of this material on such substrates creates parallel channels of easy flux penetration when a magnetic field is applied perpendicular to the film. As the applied field is gradually increased, magneto-optical imaging reveals that flux penetrates via numerous quasi-one-dimensional jumps. The distribution of flux avalanche sizes follows a power law, and data collapse is obtained by finite-size scaling, with the depth of the flux front used as crossover length. The intermittent behavior shows no threshold value in the applied field, in contrast to conventional flux jumping. The results strongly suggest that the quasi-one-dimensional flux jumps are of a different nature than the thermomagnetic dendritic (branching) avalanches that are commonly found in superconducting films

Nonlinear acousto-electric transport in a two-dimensional electron system

We study both theoretically and experimentally the nonlinear interaction between an intense surface acoustic wave and a two-dimensional electron plasma in semiconductor-piezocrystal hybrid structures. The experiments on hybrid systems exhibit strongly nonlinear acousto-electric effects. The plasma turns into moving electron stripes, the acousto-electric current reaches its maximum, and the sound absorption strongly decreases. To describe the nonlinear phenomena, we develop a coupled-amplitude method for a two-dimensional system in the strongly nonlinear regime of interaction. At low electron densities the absorption coefficient decreases with increasing sound intensity, whereas at high electron density the absorption coefficient is not a monotonous function of the sound intensity. High-harmonic generation coefficients as a function of the sound intensity have a nontrivial behavior. Theory and experiment are found to be in a good agreement.Comment: 27 pages, 6 figure

МАЗЬ ОФЛОМЕЛИД. КЛИНИКО-ЛАБОРАТОРНАЯ ЭФФЕКТИВНОСТЬ И ПЕРЕНОСИМОСТЬ У БОЛЬНЫХ С ИНФЕКЦИОННЫМИ ПРОЦЕССАМИ КОЖИ И МЯГКИХ ТКАНЕЙ

The paper presents the results of a multicenter postmarketing study of Oflomelid ointment versus levosin and levomecol ointments in 301 patients with different purulent diseases of the skin, soft tissues, and bones, diabetic foot syndrome, trophic ulcers of different etiologies, postoperative purulent wounds, chronic posttraumatic osteomyelitis, burns and frostbites, acute and chronic purulent diseases of the skin and soft tissues. Oflomelid ointment shows a high clinical and bacteriological efficacy in stages I and II wound process along with good analgesic activity for the topical treatment of purulent processes of different etiologies and sites. Objectivization of the findings is based on the results of qualitative and quantitative microbiological analyses, wound imprint cytology, and trends in the systemic and local clinical picture.В статье представлены результаты многоцентрового постмаркетингового сравнительного исследования мази Офломелид по сравнению с мазями левосин и левомеколь у 301 пациента с различными гнойными заболеваниями кожи, мягких тканей и костей, синдромом диабетической стопы, трофическими язвами различной этиологии, послеоперационными гнойными ранами, хроническим посттравматическим остеомиелитом, ожогами и отморожениями, острыми и хроническими гнойными заболеваниями кожи и мягких тканей. Показана высокая клиническая и бактериологическая эффективность мази Офломелид при I и II стадиях течения раневого процесса наряду с хорошим анальгезирующим действием для местного лечения гнойных процессов различной этиологии и локализации. Объективизация полученных данных основана на результатах качественных и количественных микро-биологических исследований, цитологии раневых отпечатков, динамики общей и местной клинической картины