Quantum Optics, Quantum Electronics |
|
Tabatchikova K. S., Taichenachev A. V., Yudin V. I. Suppression of the Field Shift of Ramsey Resonance on Forbidden Transitions of Atoms and Ions We perform a theoretical analysis of the Ramsey scheme with pulses of different duration and with a phase step in the second pulse with account for the finite width of laser line. We define optimum features of pulses that correspond to maximum suppression of the field shift and maximum amplitude of resonance for both schemes. Ramsey scheme with a phase step in the second pulse provides effective suppression of the field shift and it is less sensitive to the Rabi frequency fluctuations in comparison with Ramsey scheme with pulses of different duration. First experiments on ytterbium single-ion optical clock (Germany, PTB) confirm theoretical predictions. |
|
Batomunkuev Yu. Ts. Aberrations of Volume Cylindrical Holographic Optical Element The analytical expressions allowed to calculate the third-, fifth- and seventh-order monochromatic and chromatic aberrations are obtained for the cylindrical volume holographic optical element by method of the characteristic function. The formulas for coefficients of third-, fifth- and seventh-order aberrations are presented. It is noted that coefficients of the aberrations arising because of photo induced, thermally induced and deformation changes of refractive index and of sizes of the cylindrical volume holographic optical element can be isolated in these coefficients. It is shown that width of the working spectral range for reflection cylindrical volume holographic optical element is inversely proportional to its thickness and for transmission holographic element is inversely proportional to square its thickness. |
|
Radiophysics and Electronics |
|
Kozak V. R., Kuper E. A., Vinokurov N. A., Serednyakov S. S., Tararyshkin S. V., Tribendis A. G., Selivanov P. A. The Control System of the Novosibirsk Free Electron Laser The Novosibirsk free electron laser (FEL) is the source of the coherent radiation with tunable wave length and operates
on the basis of the multiple-turn energy recovery linac. The whole FEL itself represents the large physical facility, |
|
High-Energy and Accelerator Physics, Physics of High-Temperature Plasma |
|
Burdin P. N., Devyataikina T. A., Kazantseva E. S., Rybitskaya T. V., Skarbo B. A., Starostenko A. A., Tsyganov A. S. Improvement of Quadrupole Magnets Field Quality in Serial Production Technology of production of quadrupole magnets with high quality fields is presented in the article. The technology
was developed in Budker Institute of Nuclear Physics. It includes method of correction octupole and sextupole harmonic |
|
Physics of Field, Neutral and Ionized Gases |
|
Kornilov V. I. Study of Possibility of Simulation of Thick Turbulent Boundary Layer on a Flat Plate of Limited Length The experiments directed to the study of possibility of simulation of thick equilibrium (according to Clauser) incompressible turbulent boundary layer on a flat plate of limited length have been performed. It is shown that the artificial generators manufactured from circular cylinders (pins) of adjustable height h, which were mounted normal to the wall in a staggered order in two rows in х in vicinity of the plate leading edge are quite effective means of artificial boundary layer thickening. In most cases both the averaged and fluctuation boundary-layer characteristics at a downstream distance about 530 cylinder diameters have values typical for naturally-developed turbulent boundary layer. Mean velocity profiles in the artificially thickened boundary layer taken in wall-law variables are approximated with a good accuracy by the wellknown velocity law valid for canonic boundary layer and they are generalized by a unified dependence using empirical velocity scale. |
|
Aulchenko S. M., Zamuraev V. P., Kalinina A. P. Controlling of the Streamline of Elements of the Airplane by Means of the External Energy Supply The studies of acting of pulsed-periodic energy supply on the transonic flow regimes of streamline of the body of
revolution were performed for different models of the energy source. The possibility of a significant restructuring of the |
|
Ganeev O. V., Zudov V. N., Tretyakov P. K., Tupikin A. V. Diffusion Flame of Propane in a Weak Electric Field Now burning fuel in technological devices is made in a diffusion condition. To one of problems remains to stabilization
of a flame at large flow rate of air. The affecting of electrical fields is an effective remedy of control of a flame since |
|
Fominykh E. G., Petrova-Bogdanova O. O., Anisimov M. P. Vapor Multifold Nucleation Rate Surfaces for Case of the Polimorfous Enantiotropic Phase Transitions of a Condenced Phase Examples of the nucleation rate topologies for systems which are having the enantiotropy polymorphic phase transitions, using the idea of the nucleation rate surface semiempirical design over the phase equilibria diagrams, are presented. It was shown that multichannel vapor nucleation in according the independent set of the nucleation rate surfaces are realized in these cases. The traditional using for these systems one channel approximations of the nucleation rate theories is wrongful. The nucleation rate surfaces designed can be used as illustration of the phase sequence rule, the first version of which was formulated earlier by Ostwald. |
|
Chernyavskiy A. N., Pavlenko A. N. Semiempirical Method of Boiling Expectation Time Calculation in Falling Wavy Liquid Film The Mathematical model which allows to calculate boiling expectation times in falling wavy liquid films on nonsteady heat release has been represented. It has been shown that it is necessary to take a convective constituent of a heat transfer into account in heat exchange modeling in falling films. The effective thermal conductivity coefficient which invlolves a convective constituent of a heat transfer calculated from average wave characteristics using Vorontsov method has been used. The method of accounting of the wave moving influence on a heat exchange process has been presented. The comparison of results of a numerical simulation and experimental data has been done. |
|
Khodakov M. D., Zarvin A. E., Kalyada V. V., Korobeishchikov N. G. Mass-Spectrometry of Supersonic Cluster Jets of Methane and Argon-Methane Mixtures We describe a new experimental facility LEMPUS-2, which provides experimental research in supersonic flows of
gases and gas mixtures in the oil-free vacuum. Model experiments in a flow of pure argon in order to verify and test the |
|
Syzrantsev V. V., Bardakhanov S. P., Lysenko V. I. Viscosity of the Water Dispersions Containing Nanodimensional Silica Powders The dependences of dynamic viscosity of the dispersions containing nanodimensional silica powders, on concentration, the size of particles and a specific surface of powders are received. Comparison of such dependences for the nanopowders received by two different methods is carried out, and the reason of different extent of influence various by origin powders on viscosity of dispersions is proved. |
|
Solid-State and Semiconductor Physics, Physics of Nanostructures |
|
Naumov V. N., Tagaev A. B., Musikhin A. E. The Phonon Density of States of Solids from the Experimental Heat Capacity The new method of determining the spectrum phonon density of states g(?) from the experimental data in the heat capacity C(T), obtained in the wide temperature interval is suggested. At the primary stage g(?) is described in symptomless ones (near zero and limit frequencies). The parameters can be determined from the C(T) curve. So the obtained zero coming for the phonon density of states g(?) is made by the iteration process when the redistribution in the frequencies of the vibrating modes of the zero coming is done. The iteration process is connected with the difference reduction in the made and experimental heat capacity and managed by the redistribution of the vibrating modes. The method is viewed for the number of the model spectra with different degree of complication. The obtained results show the possibility of the singling out three peaks in g(?) with the right description of their form. The phonon density of states for aluminum is determined and the comparison with the investigation results represented in the list of literature is done. |
|
Popov V. N., Kovalev O. B., Smirnova E. M., Tsivinskaya Yu. S. Numerical Evaluation of the Effect of a Surface-Active Component on the Convective Mass Transfer during the Metal Surface Melting by the Laser Impulse Under consideration is a mathematical model of the alloying process of the metal surface by the pulsed laser radiation. The dependence of the surface tension on the surface-active impurities in the melt is analyzed. The numerical simulation enabled to determine the possibility of development of flows and distribution of the alloying material into the metal. |
|
Chemical, Biological and Medical Physics |
|
Matskevich N. I., Bryzgalova A. N., Wolf Th., Greaves C., Naumov B. N., Vyazovkin I. V., Chupakhina T. I. Structure, Ionic Conduction and Thermodynamics of New Compounds Based on Bismuth and Renium Oxides New compounds Bi14ReO24.5, Bi12.5Lu1.5ReO24.5, Bi12.5Ho1.5ReO24.5 were synthesized by solid-state method with bismuth oxide, Bi2O3, ammonium perrhenate, NH4ReO4, lutecium oxide, Lu2O3, and holmium oxide, Ho2O3. The lattice parameters and space group were determined by X-ray diffraction spectroscopy. Bi14ReO24.5 has tetrahedral symmetry, space group I 4/m, Bi12.5Ho1.5ReO24.5 и Bi12.5Lu1.5ReO24.5 have cubic symmetry, space group Fm3m. Ionic conduction of Bi12.5Lu1.5ReO24.5 phase was measured by impedance spectroscopy in a temperature range from 500 to 900 °C. It was shown Bi12.5Lu12.5ReO24.5 is one of the best ionic conductors in range of medium temperatures and has the same conductivity as that for BiCuVOx, Bi12.5Ln12.5ReO24.5 (Ln = La, Nd) at 800 K. The heat of solution for Bi12.5Lu1.5ReO24.5 was measured by solution calorimetry in hydrochloric acid with concentration 2 mol*L-1 (2M). The heat of formation from binary oxides was estimated using finding and literary data; it was shown Bi12.5Lu1.5ReO24.5 is thermodynamically stable at room temperatures. |
|
Computer Science, Information-Communication Technologies |
|
Golitsyn A. A., Seyfi N. A. The Architecture of the Digital Device for Round-The-Clock Surveillance The article describes the hardware development of the image processing system which is used as a viewer in digital day-and-night surveillance device. During the work the most suitable image sensor for the surveillance in low luminance conditions is selected, image processing module based on FPGA is developed and the printed circuit board of the device is designed. |
|
Educational and Methodical Provision of Teaching of Physics |
|
Yakovlev V. I. The Energy-Momentum Balance of Radiation Emitted by a Charged Particle in Relativistic Motion Methodical work containing the elementary derivation of the energy-momentum balance at the relativistic charged particle radiation reached at the expense of using the rate of energy loss by a independent of radiation power. |
|
|
Our Contributors |
|
|
Instructions to Contributors |
|
|
|
|