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³ , 15(91), 2001


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621.317:681.325:518.5
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539.42+620.19
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Some aspects of material non-destructive testing are represented in terms of its application to the fracture mechanics. The active NDT methods which utilize of the sounding or stimulating physical fields as well as the acoustic emission analysis and the inspection information processing are considered briefly. The modern concept of the NDT methods development for the purposes of technical diagnostics are formulated.

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539.375:620.179.16
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In paper is considered some basic problems of selection and transfer of acoustic emission (AE) waves. Models for processes of AE generation during subcritical growth of internal crack are developed. The dependencies between amplitudes of AE signals and area of growing crack are obtained. New methods and gages for crack growth resistance assessment based on these results are developed.

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621.643.002.5
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Possibility of practical realization of the limited projections ultrasonic computerized tomographic technology for nondestructive testing of sheet products on the basis of the shadow images technigue of data collection at use only one angle of ultrasonic signal introducing into a product have been theoretically and experimentally substantiated.

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621.317.3/4
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The work is dewoted to the problem of investigation electric field in the environment with condactivity. It described the instrumetation and experimental methods measurement such field with verious tipes of the electrode sensores. Various types of salt-bridge switches is considered.

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621.391-519.21
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The concise history of signal investigation in Physics and Methanics Institute and main ideas of the energy theory of stochastic signals is summarized.

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621.77(088.8)
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Main results of researches on the discovering and analysis of hidden periodicities on the basis of their models in the form of periodically correlated random processes are indicated. Examples of developed methodology to the study of probabilistic structure of oscillation with stochastic recurrence are considered

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518.5
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The using of computer algebra methods in numerical mathematics is considered. Examples of building Chebyshev balance spline approximation methods and building optimal iterative procedures are presented.

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629.519
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In this work the characteristic examples of the hierarchically organized systems with the self-organization as a main principle were observed. The first example from the "classical" field of investigation is the researching of the self-organization phenomena in living tissue. Another example taken from modern field of self-organization theory. That is the information processing and storage was considered. The accent was put on the fact, that the similar models could be vised for the researching of self-organization in such fields of exploration.

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550.380.83:621.317.337
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Perspectives of further development of highly effective sensors for measurement of magnetic and mechanical values (magnetic field, mechanical stress, torsion and vibration) on the base of usage of amorphous and nanocrystalline ferromagnetic alloys are shown in the article.

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550.837: 550.83: 621.325
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The structure of the signals arising at pulse and harmonic investigations of objects and environments, and also the methods of suppression of regular, pulse and random high-frequency noise arising at it are described. Specific instances of technical applications of these methods are indicated.

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621.317
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Noise immunity new methods and equipments the time parameters of pulse signals is proposed. Principle of construction micropocessors systems is considered. Results of analysis error systematics and stohastics measurements is passed.

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538.3:550.372:620.1:621.6
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The parameters of traditional corrosion testing of underground pipelines and informative characteristics of pipeline electromagnetic field are analyzed. Gradient and parallax methods and devices for non-contact currents measuring are considered. The procedure and results of pipelines insulating cover and electrochemical protection inspections in exploitation conditions are presented.

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681.325.5
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Empirical method for the quality of image estimation is proposed. Local contrast is shown to be a base for methods of the image enhancement. A new approach for construction methods of the stretch, histograms and ranks transformations, unsharp masking and the local contrast transformations are proposed.

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621/325
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In the article the tasks of digital processing, recognition and analysis for 2-dimentional images of spatial structure of material are considered and solved. The algorithms of image analysis for structure of material have been developed and implemented on the base of the proposed connectivity model.

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681.7:621.391
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The new method for correlation identification of protected objects is proposed. This method is based on usage of an optical mark containing a transformed phase mask. The high efficiency of this method is demonstrated theoretically and experimentally. The optical-digital device for identification of credit cards is created on basis of the proposed method.

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: 10.02.2004