Achievable performance of turbo codes over the correlated Rician channel

The performance of turbo codes is evaluated through analysis and simulation over the Rice multiplicative fading channel. The analysis is conducted extending the results presented by A.M. Viterbi and A.J. Viterbi (see Proc. ISIT'98, p.29, 1998) to the Rice multiplicative fading channel case. Simulation results are obtained using an extended version of the improved Jakes' channel simulator, first presented by M.F. Pop and N.C. Beaulieu (see IEEE Trans. Commun., vol.49, p.699-708, 2001).     

Determination of the tension in a jet of polymer solution

Conclusions A contactless, high-sensitivity method has been developed, which permits one to measure the tension in various points over the length of a jet from the form of the bend in a jet of polymer under the action of a directed air stream.The dependence of the tension in jets of solutions of polyacrylonitrile of various concentrations on rate of take-up has been investigated.Translated from Khimicheskie Volokna, No. 6, pp. 31–32, November–December, 1984.     

Properties of aluminum alloys with a titanium nitride coating

The creation of a titanium nitride coating on the surface of articles is one of the most effective methods of enhancing the wear resistance of materials. This coating is also promising from the standpoint of the possibility of achieving high hardness, strength, and simultaneously good protective-and-decorative surface properties. We investigated the possibility of improving the tribotechnical characteristics and corrosion resistance of the widely known aluminum alloys PV-90, D16, and 1420 using the titanium nitride coatings applied by the ionplasma method.N. É. Bauman Moscow State Technical University. All-Union Scientific-Research Institute of Aviation Materials. L. Ya. Karpov Scientific Institute of Physical Chemistry. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 20–23, June, 1994.     

An Experimental Investigation of an Avalanche of Relativistic Runaway Electrons under Normal Conditions

The development of avalanches of relativistic runaway electrons is investigated in an experiment similar to the classical Townsend experiment, but in the relativistic energy region. A large-scale laboratory setup is developed with an operating voltage of up to 1.2 MV, which is a chamber with flat electrodes separated by a segmented insulator. A sensitive collector method of analyzing the spectra of high-energy electrons is developed, which is used in electron detectors with a large collecting surface. The multiplication of relativistic electrons in the air is investigated at voltages of up to 1.0 MV. The initial stage of a relativistic electron avalanche is realized for the first time. The results of measurements agree with the results of Monte Carlo simulation.     

Effect of the Structure of Lithium-Silicate Glasses on the Mechanical Properties of Transparent Glass-Ceramic Materials

Strength of Materials - The development prospects of high-strength transparent glass-crystalline materials on the basis of lithium disilicate for protection of optical systems are found to be...     

Efficient catalysts for olefins from alkanes: sol–gel synthesis of high surface area nano scale mixed oxide clusters

High surface area nano scale Li/MgO oxide clusters with low lithium loadings are prepared by sol–gel method. Appreciable amounts of lithium present can be incorporated into the magnesia gel during preparation and retained in the oxide matrix after gel combustion. This limits presence of free lithium phases and helps prevent the associated sintering and loss of surface area during thermal treatments. The sol–gel method also allows to circumvent the high temperature treatments necessary to incorporate lithium into the magnesia oxide matrix, a prerequisite for the formation of [Li⁺O⁻] type defect sites which are the catalytically active sites for oxidative dehydrogenation of alkanes.     

Effect of electron overheating on the tunneling current of a molecular transistor

The effect of overheating of the electron subsystem on the Coulomb blockade in a structure (molecular transistor) based on a metal cluster containing a finite number of atoms has been theoretically studied. The electron energy spectrum in such quantum grains of cylindrical and spherical shape has been calculated. An increase in the electron subsystem temperature in the cluster leads to vanishing of the current gap and pronounced smoothening of the quantum and Coulomb steps on the current-voltage characteristic of the structure, in agreement with experimental observations.