The desire to extrapolate the well-developed quantum mechanics scattering theory to acoustic scattering served the stimulus to write the review. Probably this can help in the solution of acoustic problems of scattering, in particular in solution of problems of acoustic radiation pressure calculation. This part of the review states the identity of both problems of scattering. The results of the central potential quantum mechanical scattering are presented. Special attention is given to the description of analytical properties of radial wave functions, Yost functions, partial scattering amplitudes and their features. The equations for the evaluation of partial phase shifts are given. Resonances caused by scattering matrix poles, distinct from the poles corresponding to the bound states are discussed.

Institute for Analytical Instrumentation of RAS, Saint Petersburg

Based on the analysis of gas-discharge devices forming ion and electron beams in high-voltage gas discharge, a new approach and corresponding gas-discharge device that generates large-format directed flows of the off-electrode plasma for the production of micro- and nano-sized diffractive structures on large-format plates is proposed.

¹S.P. Korolyov Samara State Aerospace University (National Research University)
²Image Processing Systems Institute RAS, Samara

The problems of a low-noise reference oscillator construction for high-sensitive radars based on quartz, SAW and HBAR are considered. The comparative analysis shows a promising application of resonators based on bulk acoustic waves. Problems of constructing generators based on HBAR, associated with high TCF resonator were revealed. The method for HBAR temperature stabilization on the basis of digital frequency lock loop is suggested.

Precise Mechanics and Control Institute, RAS, Saratov

The mathematical model for the two-layer Si-Ge, Si-AsGa, Si-CdTe X-ray energy dispersive detectors is proposed, based on X-ray radiation and photon transport in detector. Also the mathematical model of the energy dispersive spectrometer, based on the detector, is considered. Using Monte-Carlo method, the probabilities of the photon registration in a different parts of the detector response function are calculated. It is shown that using the Si detector as the first layer of the detector, Ge, AsGa or CdTe detector as the second layer, and time anticoincidence scheme it is possible to design the detector with some adventures: with reduction of photo escape peak of the second detector and with high-energy efficiency the same as the second detector. It is shown that in some cases, if the two-layer detector is used, signal to background ration is increased.

¹Irkutsk State University of Transport, Irkutsk
²Applied Physics Institute at Irkutsk State University, Irkutsk

General expressions for radiation pressure forces on any inserts in the field of plane progressive and plane standing waves in an ideal fluid were obtained. Inserts are characterized by scattering amplitude. The obtained general expressions were detailed for a number of interesting special cases. It was shown, that the earlier formulae were a special case of these expressions. Necessity for the account of the real and imaginary scattering amplitude components was shown. Calculations for specific cases are given.

Institute for Analytical Instrumentation of RAS, Saint Petersburg

The work is devoted to successive approximation method intended for the solution of mathematically an incorrect inverse problem for one-layer system with the transparent ultra-thin film. The earlier developed method is not only simplified, but also is considerably improved. First of all it concerns a sign on which optimum value of an absorption constant of a substrate is determined. The new variant of the method can be successfully used to study the superficial structure of different objects, including fluids.

¹Sumy, Ukraine
²Institute for Analytical Instrumentation RAS, Saint-Petersburg

Temperature dependence of parametric nanoparticles colloid solution magnetic susceptibility at the beginning of magnetization curve was studied by NMR method. Magnetic susceptibility was defined as relation between magnetization and tension H of magnetic field inside the sample. Magnetization was defined by difference between induction of magnetic field inside the sample and µ0 H value. The relation obtained is described by Curie’s law.

Saint-Petersburg State Institute of Technology (Technical University)

The article deals with the generalized algorithm space-time filtering signal, which is based on the methods of the theories of nonlinear filtering. The synthesis of the algorithms is done providing theory-group transformations of the signal in time area. The method for co-ordination of symmetries of the signal and facilities of the processing is suggested.

Popov Higher Naval Academy of Radio Electronics, Petrodvorets

The experimental exposure device has been developed to be used in the study of superweak static, alternating and combined magnetic fields effects on living systems. The experiments have been carried out on the biological models of lower eukaryotes — microscopical fungi, cultivated under conditions of the screened and balanced Earth magnetic fields up to 10÷100 nT. The obtained results showed that "magnetic vacuum" (i. e. weakening of Earth magnetic field 200÷600 times) causes anomalous polar growth of micromycetes’ mycelium.

¹A.F. Ioffe Physico-Technical Institute of RAS, Saint-Petersburg
²Saint-Petersburg State University
³V.L. Komarov Botanical Institute of RAS, Saint-Petersburg

A technique for pulsed alternating-current measurements of the electrochemical reaction current is proposed. It differs from the classical and normal pulsed amperometric versions in that the range of the working electrode potentials is selected in the half-wave potential of determined component, and not in limiting diffusion current, and alternating-current scanning is superimposed on the impulse front. Optimal conditions for benzoquinone and phenol detection are selected. Linear dependence of analytical signal on the concentration of these substances was obtained.

Saint-Petersburg State University

Measurement characteristics of spectral pyrometer for recording of series containing hundreds or thousands of thermal spectra of object under study and for determination of temporal dependences of temperature T(t) are discussed. Experimental registration of thermal spectra sequences was performed for the first time. Spectrum collection time equals to 3–5 ms, operation frequency is 200–330 Hz. Dependency of titanium particles temperature and steel plate on time of their laser heating at wavelength of 1064 nm and power of 6–12 W was shown.

Research Institute of Advanced Materials and Technology, Moscow

This work is devoted to the problem of isotopic heavy water control on PIK reactor. The results of IR-spectroscopic heavy water investigation for the purpose of correct isotopic analysis are shown. The methods that are used for the laboratory control of deuterium concentration (aD) of heavy water in reactor system and heavy water installation of PNPI are presented. It is proposed to use infrared spectrometry for isotopic on-line control of heavy water coolant at PIK reactor.

¹PNPI, Gatchina, Leningrad Region
²Saint-Petersburg State University

The article is devoted to the problem of optic processing information devices development and systems in nano execution. Application perspectives of up-to-day achievements in the field of development and manipulation of multiwalled carbon nanotubes for producing optic processing information nano devices, the example — optic minimal signal nanoselector is considered.

Rostov State Transport University, Rostov-on-Don

A algorithmic methods for estimating optical cell parameters for recognition of different types of leucocytes by their microscopic images captured in transmitted light are described. Granulocytes, monocytes and lymphocytes can be identified by relative transparency and granularity (presence of expressed internal structure). To illustrate the application of cell identification methods in cytometry the results of leukocyte analysis of real blood samples are shown.

Institute for Analytical Instrumentation of RAS, Saint-Petersburg

Methods allowing removing obstacles and noising which upper frequency exceeds half of digitization frequency are considered. This operation is performed by means of single-level discrete wavelet transform in optical information digitization. The need in such methods development is due to the fact that such frequencies presence in the spectrum after digitization can distort optical images significantly. The initial data for the considered method application are involved in the digitized optical image, digitization frequency of which along both coordinates exceeds the digitization frequency of the image transmitted to the recipient. Initial image can contain obstacles and noise with frequencies higher than half of digitization frequency. The proposed methods application allows filtering the denoted frequencies, and not to distort information. In conclusion, the theoretical approach for the light field digitization problem is generalized.

¹Scientific Instruments Co., Saint-Petersburg
²A.F.Ioffe Physical-Technical Institute, RAS, Saint-Petersburg
³Institute for Analytical Instrumentation of RAS, Saint-Petersburg

The factors responsible for mass discrimination in quadruple mass spectrometry with the electron impact ionization were analyzed using mathematical modeling methods. The ways of mass discrimination minimization in ion sources are considered

Institute for Analytical Instrumentation of RAS, Saint-Petersburg

Based on numerical simulation a design of fully gridless orthogonal accelerator is proposed for multi-reflecting time-of-flight mass analyzers characterized by small flight time aberrations of ion packets.

Institute for Analytical Instrumentation of RAS, Saint-Petersburg

Contents Vol. 22 N1 >>