Temporal field dynamics in parametric acoustic resonator

The temporal field dynamics in acoustic resonator at high-frequency spatially uniform modulation of the speed of sound in the resonator material with a time-dependent modulation coefficient is described.     

Ordering of Fe and Zn Ions and the Magnetic Properties of FeZnMo3O8

JETP Letters - In the present paper, the electronic, magnetic, and structural properties of a novel system FeZnMo3O8 with a polar crystal structure are investigated using GGA + U (Generalized...     

Suspension Dynamics in an Optical Field

Dynamics of a suspension of dielectric nanoparticles in an intense laser field is considered for the first time. A two-dimensional model is developed for interaction of laser radiation with nanoparticles in a suspension. A stable spatial configuration of nanospheres in a suspension is found and dispersion relations for low-lying excitations of a multiparticle system are determined within the model.

     

Phase conjugation of sound beams in semiconductors under an AC magnetic field

A new physical mechanism of phase conjugation of sound beams, based on the phononplasmon interaction in a semiconductor upon modulation of longitudinal electron velocity in a Langmuir wave by an external ac magnetic field, is discussed.     

Size-dependent photocurrent switching in chemical bath deposited CdSe quantum dot films

Journal of Solid State Electrochemistry - Size-dependent photocurrent switching has been investigated in chemical bath deposited CdSe quantum dot (QD) films with band gaps 2.26, 2.09, and...     

Search for a ΔΔ(1236) component of the deuteron

The dp → nnpπ⁺, dp → ppnπ⁰ and dp → pppπ^- reactions at 3.33 GeV/c deuteron momentum on the proton target were studied in order to search for a ΔΔ configuration in the deuteron. The frequent backward emission of the (pπ⁺), (nπ^o) and (pπ^?) systems in the deuteron rest frame was observed. The origin of the effect was analysed from the point of view of a possible ΔΔ admixture in the deuteron wave function. Some other sources which may contribute to the signal are indicated.     

“Guest-Host” effect in polymer-dispersed nematic liquid crystals

In this paper we report on a new optoelectronic material representing a polymer-dispersed liquid crystal (PDLC) film. This material exhibits optical response to the applied electrical field and is useful for displays and light gates. The effect of azo and anthraquinone dyes on the optical density of PDLC films has been studied. The proportion of the dye dissolved in an LC cell and the molar absorption coefficients were determined, and the influence of the dyes on the scattering efficiency of PDLC films was calculated.Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences. Translated fromZhurnal Strukturnoi Khimii, Vol. 34, No. 6, pp. 114–117, November–December, 1993.Translated by L. Smolina     

Nonlinear induced reflection of light waves in semiconductors

A scheme of nonlinear optical four-wave mixing of two counterpropagating laser beams on the surface of a semiconductor is proposed and analyzed. It is shown that the density modulation of the electron-hole plasma current carriers in the light-induced grating manifests itself in the probe beam depolarization signal after the reflection from the surface, which is sensitive to the state of the surface and presence of complex molecules on it.     

Small-angle x-ray scattering study of polymer structure: Carbosilane dendrimers in hexane solution

The three-dimensional organization of monodisperse hyper-branched macromolecules of regular structure—carbosilane dendrimers of zero, third, and sixth generations—has been studied by small-angle X-ray scattering (SAXS) in solution. The use of modern methods of SAXS data interpretation, including ab initio modeling, has made it possible to determine the internal architecture of the dendrimers in dependence of the generation number and the number of cyclosiloxane end groups (forming the shell of dendritic macromolecules) and show dendrimers to be spherical. The structural results give grounds to consider carbosilane dendrimers promising objects for forming crystals with subsequent structural analysis and determining their structure with high resolution, as well as for designing new materials to be used in various dendrimer-based technological applications.