A singular integral equation for the current density of a conformal microstrip dipole on a dielectric cylinder

Technical Physics Letters - The problem of current-density distribution over the surface of a microstrip dipole antenna conformally arranged on a dielectric cylinder is reduced to a singular...     

Express screening of biological objects using multisensory inversion voltammetry with pattern recognition

Express diagnosis of biological objects is required for operative preliminary estimation of various states of the organism. A new method is proposed for recognition of multidimensional patterns obtained by analysis of multisensory voltammograms of electrochemical test system in the formats of “electronic tongue” and “electronic nose” formats. These formats are realized in the process of electrochemical studies of liquid and gaseous phases. The proximity of the obtained pattern of the tested object to the known patterns accumulated in the database is estimated. Examples of express diagnosis of glaucoma based on the results of electrochemical studies of blood serum are provided.     

A method and integrated circuit for processing random data streams in multichannel experimental physical equipment

An asynchronous data stream processing method in multichannel experimental physical equipment is described. The conversion of an input data stream irregular in time into data synchronized with the fundamental clock frequency of the system is considered. The realization of the proposed method as part of the specialized integrated circuit manufactured by the CMOS process of the UMC Co. (Taiwan) with 0.18-μm design rules is presented. The structure, principle of operation of the microcircuit, and experimental results of its tests are described. The work is performed as a part of the CBM experiment of the new FAIR accelerating facility (GSI, Darmstadt, Germany).     

Exoemission Analysis of Energy Levels in the Surface Layer of Biocompatible Ca10(PO4)6(OH)2

Thermostimulated exoelectron emission from sintered hydroxyapatite (HAP), Ca₁₀(PO₄)₆(OH)₂, prepared by the alkoxy method was studied in the temperature range 300–800 K. The results were used to determine trap depths, the frequency factor in the Boltzmann probability of thermal release, lifetime of conduction-band electrons, and charge density at active centers in the surface layer of the material. The exoelectron emission data are correlated with earlier thermostimulated current measurements and structural studies of phase transitions in HAP. Possible lines of further research are discussed.     

Exoelectron emission and critical phenomena in CuCl crystals

The temperature dependence of thermostimulated exoelectron emission (TSEE) and the specific heat c _p of CuCl single crystals were studied in a broad temperature range. It is suggested that the TSEE peaks observed in the region of 375 and 420°C are due to the polytype formation and the structural transition from a sphalerite to wurtzite polymorph; the peak at 170°C is assigned to Cu²⁺ ions present in the CuCl crystals studied.     

Thermal Expansion of BaO · 2B<Subscript>2</Subscript>O<Subscript>3</Subscript> in the Vitreous and Crystalline States: I. Thermal Expansion and Density of Barium Diborate Prepared from Monolithic Glass of the Same Composition

The thermal expansion and density of vitreous and polycrystalline barium diborates prepared by crystallization of monolithic glasses of stoichiometric composition are investigated in the temperature range 20–700°C. The glass crystallizes in the form of the α and β modifications depending on the heat treatment conditions. The α phase nucleates on the surface of the monolithic sample and grows inward the sample in the form of textured layers. The β phase nucleates in the melt bulk and grows in the form of spherulites. Textured polycrystalline barium diborate in the form of the α phase possesses a pronounced anisotropy of thermal expansion with respect to the direction of crystalline-layer growth. This is associated with the negative expansion along one of the crystallographic axes. The effective temperature coefficients of thermal expansion in the temperature range 20–600°C increase in the order: α phase-glass-β phase. Upon heating above 690°C, the β phase transforms partially into the α phase. This is accompanied by a considerable increase in the volume. The densities of the glass and polycrystalline samples in the temperature range 20–700°C increase in the order: glass-α phase–β phase.     

Effect of the crystal face orientation on the thermostimulated exoelectron emission from leucosapphire and zinc oxide crystals

It is established that the character of thermostimulated exoelectron emission from the surface of leucosapphire and zinc oxide single crystals depends on the crystal face orientation. The temperature of the electron emission peak increases with the surface energy and reticular density of the face studied.