KEYWORDS: Data modeling, Analytical research, Metals, Mechanics, Distortion, Analog electronics, Computing systems, Electronics, Information technology, Systems modeling
The description of the problems, solved within the frame of deformability theory is given. The mathematical statement of the basic problem of deformability theory for obtaining the analytical dependеnces of ultimate strains in closed form is considered. It is shown that this problem, even applying the principle of linear damage accumulation is connected with the solution of a nonlinear integral equation, that can be composed in a number of ways. The general solution of the integral equation for the case, set by deformations path, is obtained. Analytical solutions of the basic problem of deformability theory for separate cases are obtained and analyzed, in particular, for deformations path, that occurs on the free surface at axisymmetric compression of cylindric specimen by flat rough plates.
TiO2 thin films were deposited on glass substrates by HiTUS (high target utilization sputtering) technique.
Structural studies of TiO2 thin films of different thickness were performed by X-ray diffraction. Refractive index and
extinction coefficient were measured by spectroscopic ellipsometer. Transmission spectra of TiO2 thin films were
investigated in the temperature interval 77-300 K. The temperature behaviour of Urbach absorption edge for TiO2 thin
film was studied. The effect of temperature on the optical parameters and order-disorder processes in TiO2 thin films was
analysed.
For solving the problem of rate mode of multistage hot deformation optimization in order to reduce the impact of the stages number on the structure of a nonlinear programming problem, it is suggested to search the solution in the form of multistage rate change with the equal duration of stages and with rate change by the path, set by polynomial and exponential functions.
In this work the characteristics research of microelectronic transducers of optical radiation with a frequency output signal on the basis of a hybrid integrated circuit consisting of a bipolar and a field-effect transistor with a Schottky barrier is presented. The connection of an external inductance to electrodes a collector - drain allows to implement the auto generating device. The frequency of the device generation depends on power of optical radiation falling on photosensing elements as a photoresistor, photodiode and photosensing transistors switched on in a circuit of the self-excited oscillator. The impedance on electrodes the collector - drain of bipolar and field transistors has capacitive reactive part and negative active resistance, which compensates power losses in a tuning circuit of the device. On the base of a nonlinear equivalent circuit of the transducer on an alternating current the analytical expressions of function of transformation and equation of sensitivity are obtained. The sensitivity of optical transducers lays in a range from 25 kHz/μWt/cm2 up to 150 kHz/μWt/cm2.
The optical-electronic system for measuring of geometrical parameters of micrometrical objects is a difficult process that requires the observance of certain features designing or improvement. The observance of that will provide a higher measurement accuracy compared with the accuracy metrics of measurement that were developed without compliance with these design features. Every feature of the design reduces the error of the functioning of individual nodes of the system or errors in nodes under the influence of various internal or external factors. When reducing or eliminating each factor of occurrence of the error, respectively, will increase the overall measurement accuracy. In this work, the result of introducing measurement error for each factor is determined experimentally and proved the correctness of such actions.
Experimental researches of the measurement error to the stage of compliance with subtleties in the improvement of the opto-electronic system was 10 ± 1.5 μm, and after improvement with considering of the specifics of the design measurement error of geometrical parameters was 10 ± 0,33 μm.
An intermittent-contact method and means for controlling geometric dimensions of small-size complex-shaped objects is proposed. It provides sub-pixel localization of the object edge points on the image due to introduction of an additional body into the measurement zone.
The paper investigated the possibility of measuring the resistive physical quantity generator using deterministic chaos based RL-diode circuit. A generalized structure of the measuring device using a deterministic chaos signal generator. To separate the useful component of the measurement signal of amplitude detector is proposed to use. Mathematical modeling of the RL-diode circuit, which showed a significant effect of the barrier and diffusion capacity of the diode on the occurrence of deterministic chaotic oscillations in this circuit. It is shown that this type deterministic chaos signal generator has a high sensitivity to a change in output voltage resistance in the range of 250 Ohms, which can be used to create the measuring devices based on it.
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