The integration of nanosize structures in microfluidic devices makes it possible to develop devices and systems where nanomaterial special properties, features of nanofluidic and various functional possibilities of microfluidics are realized. Nanofluidics features are considered in this paper. The main claimed features of nanoscale structures in microfluidic devices are discussed

Institute for Analytical Instrumentation of RAS,
Saint Petersburg The National Research University of Information Technologies,
Mechanics and Optics, Saint-Petersburg

Hhydrodynamic trap to capture particles in a microfluidic chip with a network of parallel nanoscale channels and the U-trap with nanoscale channels were developed and studied. The simulation of liquid mass transfer process in the trap was performed. A nanoscale structures for traps was made by the method of focused ion beam. The prototype microfluidic chips with traps for high-resolution microscopy were obtained. Experimental studies on the movement of particles and liquid flows in channels of microchips confirm the adequacy of the proposed approach.

¹Saint-Petersburg State University of information technologies, mechanics and optics
²Institute for Analytical Instrumentation of RAS, Saint Petersburg
³Institution of the Russian Academy of Sciences Saint-Petersburg Academic University — nanotechnology research and education centre RAS

By means of focused ion beam technique in the gas-precursor presence wireframe nanostructures (WFNS) consisted of conductive nanowhiskers were created and visualized at the top of W and Si tips. The minimal lateral size of growth nanowhisker was about 15 nm. The perspectives of WFNSs used as specialized SPM-probes for scanning magnetic microscopy and study of surfaces of bottom and vertical walls of deep micro- and nanochannels are discussed.

¹Saint-Petersburg State University of Information Technologies, Mechanics and Optics
²Institution of the Russian Academy of Sciences Saint-Petersburg Academic University — Nanotechnology research and education centre RAS, Saint-Petersburg
³Ioffe Physical Technical Institute RAS, Saint-Petersburg
⁴Institute for Analytical Instrumentation of RAS, Saint Petersburg

For the purpose of getting the estimations of the average meanings for the polarization coefficients of the multi-layer carbon nanotubes (MWCNT) on the basis of the well-known coefficient meanings for the single-layered nanotubes are carried out. The conditions for getting of nanocomposites as the effective materials for the field emission of electrons are discussed. The experimental investigations of the characteristics of the field emission for the non-organized nanocomposite films, indicating to the possibility for getting of emission currents, at least, not less than the structurally organized arrays from carbon nanotube (CNT) are used.

¹Institute for Analytical Instrumentation of RAS, Saint-Petersburg
²Ioffe Physico-Technical Institute RAS, Saint-Petersburg

Construction features of a sector mass spectrometer for gas analyses based on permanent magnet, EI ion source and five collector ion detectors have been discussed.

¹Experimental Factory of Scientific Engineering RAS, Chernogolovka, Moscow region
²PC Industrial Electrochemical Complex, Novouralsk
³Institute for Analytical Instrumentation RAS, Saint-Petersburg

The work is devoted to the further development of the method of progressive approximation in the solution of mathematically incorrect ellipsometry inverse problem for the semiconductors with superthin oxide films. The main task is development of the additional procedure providing the choice of the only solution. The procedure directing convergence process to optimum parameter values mostly approximate to their true values is discussed. This improvement of the method is made on the basis of the real experiment. For this purpose measurements made on the sample of gallium arsenide in several point of the sample were used. Important data concerning heterogeneity of such samples along their surface and associated with the character of sample treatment were obtained. Certification method of semiconductors surface due to certain signs which are not associated with the presence of the expressed damaged layer was questioned.

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

The analytical model of the thermal type flow sensor is developed. Results of model application are used for the manufacture of the flow micro sensor of thermal type with optimum functional characteristics. The manufacturing technology of the micro sensor is described. The prototype of the micro sensor for air mass flow meter is made. The main characteristics of this micro sensor are presented.

¹Ural State University, Ekaterinburg
²Scientific and Production Association of Automatics named after academician N.A. Semikhatov, Ekaterinburg

The method of nonspecific absorption accounting for continuous-flow analysis using two detectors registration and signal processing is proposed. The method was verified using standard manganese solutions with various values of turbidity and chromaticity.

Closed Corporation "Granit-NEMP", Saint-Petersburg

The article critically analyses a conception of electron spectrometers instrument function. By means of a dimensionless mathematical model built here a strict defined integral correlation between a source energy spectrum f(E) and a current J(U) registered by detector in dependence of a device working energy U is defined. It is proved that the instrument function always depends only on a ratio (E/U), but not a difference (E-U), and not an inverse ratio (U/E) as it is declared in some articles. The main integral equation built in the article is of Volterra equation of Ist type, but not one of Fredholm of Ist type. Some concrete structures of instrument function are calculated and presented in the article. Their common features are described and discussed.

Saint-Petersburg Polytechnic State University

The series of publications describes a new method to control the movement of the charged particles by high frequency electric fields. This new class of high frequency electric fields is characterized by pseudopotentials slowly evolving in time. The paper considers the deriving of the basic expression for slowly evolving pseudopotentials. It is shown that the classical pseudopotential is just the leading term of decomposition of the true pseudo-Hamiltonian in a double series: with respect to a small parameter which characterizes the amplitude of the electric field, and with respect to the frequency of the electric field. The classical pseudopotential expression is generalized to include the case of high frequency electric fields which are characterized by "fast" and a "slow" characteristic time scales simultaneously.

Institute for Analytical Instrumentation of RAS, Saint Petersburg

Calculation of the average pressure caused by normally falling progressive plane wave at its dispersion on the laminated inclusion of the final thickness between two homogeneous liquid semispaces with different properties is discussed. Properties of dispersion matrix elements of the resulting one-dimensional problem in terms of reflection and refraction factors are presented. The physical significance of correlation between dispersion matrix elements is analyzed.

Institute for Analytical Instrumentation of RAS, Saint Petersburg

The conception is considered that generate unified view-point on different algorithms for signal separation (including de-convolution of multi-channel mixtures) on the base of signal mixture measurements. Estimating functions method is considered that give the possibility to explain the structure of different adaptive algorithms that realize de-separating matrix estimation and signal form reconstruction using only mixture measurements. The problem of signal mixture separation is formulated on the base of semi-parametric statistical model and estimating functions family. In terms of Li group formulation there is filter manifold considered.

SPbSPU, Saint-Petersburg

The problem of the calculation of radiation pressure on nonhomogenous inclusions on the string in the field of progressive plane wave was studied. The pressure was shown to be expressed through energy densities on the margins of inclusion and equals half-difference of the average density of energy before the inclusion and average density of energy behind it. The obtained data were shown to be true at certain string shift smoothness and its two first derivatives. Like quant mechanics properties of elements of scattering matrix of the resulting one-dimension problem in the terms of reflection coefficients and refraction index at lateral force are given. Physical correlation between matrix elements was analyzed. The results may be of a vast applied significance.

Institute for Analytical Instrumentation of RAS, Saint Petersburg

This article analyzes the formalization method for embedded system initial data behavior description using temporal formulas and Kripke structure. The formalization process is exemplified by the description of automatic cholinesterase activity level analyzer for human plasma and blood "Granat-4". The obtained formalized description can be used for software development, system analysis with Model Checking, formal verification and preparing test planes.

¹Institute for Analytical Instrumentation of RAS, Saint Petersburg
²International Institute for Advanced Aerospace Technologies (Saint-Petersburg State University of Aerospace Instrumentation), Saint Petersburg

Advanced model of real-time PCR signals and methods of its realization on the sigmoid function base is discussed. Numerical experiment showed that the influence of the zero line drift on modeling results can be removed by choosing an appropriate level of threshold model. The criteria of model approximation to actual fluorescence signals growing during the reaction are proposed. Possibility of fully automatic computation of real-time PCR signals threshold cycles was shown.

Institute for Analytical Instrumentation of RAS, Saint Petersburg

Fast algorithm of median filtering using data median determination in filter window by means of local histogram analysis has been suggested. When moving from pixel to pixel in the process of image scanning correction of histogram requires small number of non-complex operations. The suggested algorithm increases considerably the median filtering process compared to the traditional algorithms. This enables median filtering application sphere extending.

Institute for Analytical Instrumentation of RAS, Saint Petersburg

Contents Vol. 21 N3 >>