The chemical structure of a new insecticidal toxin isolated from the mycelium of micromycete Lecanicillium muscarium was defined. IR-, UV-, mass-spectrometry methods as well as a set of NMR-experiments were used in the work. The isolated toxin is referred to terpenoids and is an interesting for practical use

¹All-Russian Insitute of Plant Protection, Saint-Petersburg
²State Research Center for Applied Microbiology and Biotechnology, Obolensk, Moscow area
³SpbSPU (Saint Petersburg State Polytechnical University), Saint-Petersburg

Experimentally the relation of peak intensities in perfofluorine tributylamine mass spectrum within the range of mass numbers 31–502 a.e.m. obtained in a work with a small quadrupole mass-analyzer with prefilters for ion initial energies 2.5, 3.2, 4.6 and 6 eV was determined. Discrimination on heavy masses was shown to decrease with the increase of ion energy input in a mass-analyzer. In particular, the relation of ion peak intensity with a mass number 502 a.e.m. to intensity ion peak with a mass number 69 a.e.m. increases 5.6 times with the increase of ion initial energy from 2.5 to 6 eV. Decrease of resolving capacity on mass 502 a.e.m. from R₀₁ = 590 to R₀₁ = 375 and increase of absolute intensity of the ion peak with a mass number 502 a.e.m. was observed.

Institute for Analytical Instrumentation of RAS, Saint-Petersburg

The determinations of the mass spectrum, the charge and energy spectra of heavy particles and electrons emitted by solids when they are acted upon by particle and laser beams are effective method in studying physicochemical properties of solids. The paper considers the possibility of developing combined high energy resolution electron and mass spectrometers for research into solids. The spectrometers must have a relative high energy resolution. The device consists of a particle (ions and electrons) source converting particle energy spectrum into the mass spectrum, and energy analyzer with two-dimensional electrostatic field and plane of symmetry. The sources of beams exciting the surface of the sample under study are independent and not considered in the paper. The mathematical simulation of the device performance confirms the realizability of the method suggested

Institute for Analytical Instrumentation of RAS, Saint-Petersburg

The paper deals with a new method of isolating informational attributes from the processed signals, the generalized spectral analysis in the adapted basis. The studies of the functional structure of mathematical foundations and adaptable classification system of different signal types, including the quadrupole mass spectra of air, were carried out. The algorithms for synthesis of basic functions adapted to process signals of orthogonal transforms were developed. Mass spectra which was obtained by a quadrupole mass spectrometer processing, obtained on quadrupole mass spectrometer, for the analysis of air purity was used as an example.

Institute for Analytical Instrumentation of RAS, Saint-Petersburg

Microfluidic chips are the foundation of modern analytical instruments for scientific studies and medical diagnostics. The article deals with the steps for creating microfluidic chips made of glass materials by means of photolithography, wet etching with the following thermal bonding. The influence of the processes and stages of production on the characteristics and properties of the chips was investigated. Technology used in the production of small amounts of analytical chips for various purposes are discussed.

¹Institute for Analytical Instrumentation of RAS, Saint-Petersburg
²Svetlana-Semiconductors Closed Stock Company, Saint-Petersburg

A new class of gas-discharge devices forming directed flows of the off-electrode plasma for the production of micro- and nano-sized diffractive structures on large-format wafers is described.

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

The optical nanodevice for acceleration measurement realizing the idea of using multiwalled carbon nanotubes as a sensitive element and their control by means of optical streams is considered in the article.

Rostov-on-Don

Using physical and mathematical models of the X-ray fluorescence a modelling of the micro-XRF spectrometer is carried out for optimization of the micro-XRF scheme. All the results of theoretical and experimental studies confirm the consistency of the analysis performed and allow to estimate the analytical characteristics of the micro-XRF spectrometer.

Joint-Stock Company "Scientific Instruments", Saint-Petersburg
Institute for Analytical Instrumentation of RAS, Saint-Petersburg

Specific off-axis geometrical points of optical systems with curvilinear optic axis and a new fundamental projective property of conjugate gaussian points are found. This property is called by author a bipolar projective correspondence (BPC); specific off-axis points are called optical poles. Last ones provide the BPC property of gaussian points. Their existence is proved for any optical systems with curvilinear optic axis in case if the optic power of the system is not equal to zero and the deflection angle is not equal πn, where n = 0, 1,... It’s proved that optical poles are placed on the specific straight lines, called foctrices. These specific lines pass through optical foci being parallel to the opposite asymptotic arms of the optic system. Positions of optical poles are conjugated accordingly to well-known Newton’s optic equation.

Institute for Analytical Instrumentation of RAS, Saint-Petersburg ELMITEC,
Elektronen Mikroskopie GmbH, Germany

The problem under consideration includes a simulation of the spreading of liquid on the substrate surface. The possibility of determination the concentration of foreign atoms on the surface of the sample to change in the parameters of the light flux passing through the structure of the fluid substrate is shown. The basic equations describing the process of spreading of liquid droplets on the surface of the substrate, allowing determining numerical value of the concentration of atoms and molecules adsorbed by the surface of the sample, are described. The possibility of implementing rapid control of the purity of the substrate surface, using the measurement of the light flux at the photodetector, which is located on the focal axis of the dynamically changing lenses formed by spreading drop, is shown.

¹Samara State Aerospace University
²Image Processing Systems Institute RAS, Samara

The problem of calculation of a leakage field on the homogeneous, radially-layered and continuously radially-non-uniform elastic ball is discussed. In each case the vector equation of elastic oscillations is solved by means of reducing the last to the independent scalar equations for scalar potentials. Due to insignificant practical suitability of such approach in case of the continuous radial heterogeneity of a ball it is offered to use its approximation by radial piecewise constant heterogeneity that will allow to solve rather simply the problem for the general character of radial heterogeneity of ball elastic parameters

Institute for Analytical Instrumentation of RAS, Saint-Petersburg

On the basis of linearization of the combined Navier—Stokes equations without consideration of thermal effects, SLE of the fourth order, allowing finally to calculate a scattering amplitude of homogeneous elastic ball in a viscous fluid in the linear approach with arbitrary accuracy (to multipoles of arbitrary order) was obtained. In turn this will allow to apply further the procedure of evaluation of radiation pressure through a scattering amplitude in the linear approach, developed earlier to perfect fluids, and in case of weakly viscous fluids. The described procedure for obtaining scattering amplitude in the linear approach is universal and does not depend on the level of fluid viscosity.

Institute for Analytical Instrumentation of RAS, Saint-Petersburg

The article considers the methods of designing and analyzing of digital system regulation of scanning probe microscope. Physical-mathematical model of SPM in atom-force and tunnel modes is presented. This model was realized in software environment for MATLab Simulink modeling. A method for calculation of optimal parameters of digital system regulation is suggested. The results of PID-regulator designing with the suggested method are presented.

¹National Research University Information Technology, Mechanics, Optics, Saint-Petersburg
²Institute for Analytical Instrumentation of RAS, Saint-Petersburg

The previous series of publications describes a new method to control the movement of the charged particles by high frequency electric fields. The paper considers some non-trivial aspects of the derived expression for slowly evolving pseudopotentials which were not outlined in previous publications with necessary details

Institute for Analytical Instrumentation of RAS, Saint-Petersburg

The developed methods and realizing them algorithms of the estimation of spectral and temporary parameter signal in base function of spline-character (BFSH) are suggested. The method for quick transformations of signal in these bases is described. Its high computing efficiency is proved. The advantage in calculation volume in passing from discrete exponential function to particular case BFSH — a base spline-Vilenkin-Krestenson functions — is shown. Methods for the estimation of signal carrying frequencies are considered using global splines. The algorithm of spline-BPF is offered in the base functions of spline-character. Efficiency of the methods for the estimation of signal carrying frequencies from the points of view of accuracy, velocities and noise-immunity of the processing is analyzed. The computing expresses on interpolation with the use of classical and proposed methods on the example of the particular case BFSH — SVKF are evaluated.

Saint-Petersburg