Moscow State University

About: Moscow State University is a education organization based out in Moscow, Russia. It is known for research contribution in the topics: Catalysis & Laser. The organization has 66747 authors who have published 123358 publications receiving 1753995 citations. The organization is also known as: MSU & Lomonosov Moscow State University.

Optical-damage-resistant LiNbO(3):Zn crystal.

Abstract: Zinc doping is shown to reduce the photorefraction in LiNbO3:Zn. The damage-resistant crystal LiNbO3:Zn has demonstrated a conversion efficiency of approximately 50% for frequency doubling of 1.06-μm radiation. The dependence of optical characteristics on the ZnO concentration in the melt reveals a sharp change of the optical properties at the threshold concentration of 4–6 mol % Zn. The optical and nonlinear-optical data of LiNbO3:Zn are similar to those of LiNbO3:Mg, but the former shows better optical performance.

Mechanical buckling instability of thin coatings deposited on soft polymer substrates

Abstract: Deformation of rubber and poly(ethylene terephthalate) coated with a platinum or a gold film was studied. The thickness of the coating film was approximately ten nanometers. The polymer substrates were 104 to 105-fold softer than the coating. Folding of the coating leading to the appearance of a wave-like pattern on an originally smooth surface was observed both in tension and after shrinkage. In tension the wave crests are oriented along the elongation direction. After shrinkage the wave crests are perpendicular to the shrinkage direction. For rubber substrates, the appearance of the wave is explained by a mechanical buckling instability of the coating under compressive force. The length of the surface wave depends on the thickness of the coating layer and the rigidity of the polymer substrate. In addition to folding, regular fragmentation of the coating film on long and comparatively narrow bands is observed. The cracks are perpendicular to the wave crests both in tension and after shrinkage.

The design of experiments for discriminating between two rival models

Abstract: where the design points xi are known and the random variables Cik are independently normally distributed with zero mean and constant variance 0y2. In the theoretical development, but not in the numerical examples, we shall, without loss of generality, take 0-2 to be unity. The function st(x) is one of two known functions 81(x, 01) and 82(x, 02), where 01 and 02 are sets of unknown parameters of dimension m1 and in2. The purpose of the experiment is to determine which of the two models is true. The design of experiments for discriminating between any number of models has been investigated by several authors. References to this work and some comments on general aspects of the problem are given in the recent paper of Atkinson & Cox (1974) and in the ensuing discussion. Designs specific for discriminating between only two models have been derived by Fedorov & Malyutov (1972) and Fedorov & Uspensky (1975). In the present paper we collect, exemplify and generalize these results on designs for two models and describe the relationship with the designs of Atkinson & Cox, which are based on an extension of D-optimum design theory. In ? 2 we describe nonsequential designs which are the limits to which the sequential designs of ? 3 converge as the number of trials increases. In ? 4 we discuss the relationship between the two approaches when both models are linear. The least squares estimates of the parameters in the two models, which in general need not be linear, are the solutions of the equations

Electron reconstruction and identification efficiency measurements with the atlas detector using the 2011 lhc proton-proton collision data

Abstract: Many of the interesting physics processes to be measured at the LHC have a signature involving one or more isolated electrons. The electron reconstruction and identification efficiencies of the ATLAS detector at the LHC have been evaluated using proton-proton collision data collected in 2011 at TeV and corresponding to an integrated luminosity of 4.7 fb. Tag-and-probe methods using events with leptonic decays of and bosons and mesons are employed to benchmark these performance parameters. The combination of all measurements results in identification efficiencies determined with an accuracy at the few per mil level for electron transverse energy greater than 30 GeV.