(Ga0.3In0.7)2Se3 films were deposited by the thermal evaporation technique. As-deposited (Ga0.3In0.7)2Se3 films were irradiated using wideband radiation of Cu-anode X-ray tube at different exposure times. The spectral dependences of refractive index and extinction coefficient were measured by the spectral ellipsometry technique. The optical transmission spectra of X-ray irradiated (Ga0.3In0.7)2Se3 films were studied depending on irradiation time. Parameters of Urbach absorption edge for X-ray irradiated (Ga0.3In0.7)2Se3 thin films were determined and compared with nonirradiated film. The spectral dependences of refractive indices of non-irradiated and X-ray irradiated (Ga0.3In0.7)2Se3 films are described in the framework of Wemple and DiDomenico model. TThe variation of the parameters of Wemple
and DiDomenico model for non-irradiated and X-ray irradiated (Ga0.3In0.7)2Se3 films was discussed.
Periodic fiber structures generally referred to as fiber Bragg gratings are of increasing interest to sensor designers. In recent years, structures in which the phase planes are not perpendicular to the fiber axis have appeared. The paper is devoted to modeling the dependence of the TFBG spectral response on the phase plane tilt angle. The article also contains measurement results of gratings produced on the basis of the model.
KEYWORDS: Data storage, Databases, Neural networks, Artificial intelligence, Data processing, Intelligence systems, Computer programming, Information technology, Data conversion, Computer programming languages
In this study, chatbots creation technology was developed. The main aspects of using the necessary components have been analyzed and suggested to apply structural and architectural principles as in global modern software solutions. The difference between chatbots of use in server-client systems and intelligent chatbots has been reviewed. A prototype of the program was developed for the research, based on the created technology, with the necessary control of efficiency and effectiveness of use.
An inscription of a Bragg grating on a typical telecommunications fibre is difficult to obtain. In inscribing a structure, special fibres with an increased germanium content or classic fibres subjected to the hydrogenation process are used. The following article analyses the dependence of the hydrogen pressure on the parameters of the structures produced, such as grating reflectivity, Bragg wavelength or full width at half maximum (FWHM). The article also verifies how the pressure in the hydrogenation process affects the time of inscribing structures. Two types of fibre were subjected to photosensitisation: the classic one and one with a higher content of germanium. The hydrogenation process was performed at three pressures of 50 bar, 100 bar and 190 bar. Hydrogenation took place under the ambient temperature conditions of the room in which the chamber was located.
KEYWORDS: Signal processing, Phase shifts, Clocks, Digital signal processing, Quantization, Interference (communication), Fiber optics, Data communications, Analytical research, Fourier transforms
The method of improving the dynamic range of analog-to-digital conversion path of jitter analyzers in optical-fiber transmission systems in the conditions of dispersion distortions of optical signals is suggested in the work. The impact of the clock frequency jitter of an analog-to-digital converter on the noise features of the analog-to-digital conversion path by paralleling the process of the analog-to-digital conversion of signals with the correction of clock frequency jitter has been analyzed.
An optical method for determine the quantity of water in milk using the visible optical radiation range is proposed. On the basis of theoretical and experimental studies of the water-milk solution spectral characteristics the proposed method mathematical model was created. The mathematical modeling of passing of the visible range optical radiation through a water-milk solution on certain thickness of the solution layer is carried out. As a result of the modeling, the dependence of the output voltage of the photo-receiver based on a pair of photodiode-operating amplifier from the relative mass fraction of milk in the water-milk solution and the wavelength of the optical radiation in the visible range is obtained.
The paper presents an approach to engineering tasks composition on engineering knowledge portals. The specific
features of engineering tasks are highlighted, their analysis makes the basis for partial engineering tasks integration. The
formal algebraic system for engineering tasks composition is proposed, allowing to set the context-independent formal
structures for engineering tasks elements’ description. The method of engineering tasks composition is developed that
allows to integrate partial calculation tasks into general calculation tasks on engineering portals, performed on user
request demand. The real world scenario «Calculation of the strength for the power components of magnetic systems» is
represented, approving the applicability and efficiency of proposed approach.
The paper presents a method of improving a quality of radiological images for use in medical diagnosing. The method consists in grayscale morphological filtering that is based on local statistics. The essence of the proposed method is a proper modification of Wiener filter using both median and quantiles as local statistics of the morphological filter.
KEYWORDS: Mechanics, Magnetism, Transformers, Sensors, Ferromagnetics, Chemical species, Transducers, Mathematical modeling, Magnetic sensors, Control systems
Developed was a new method of control of mechanic rigidity in assemblies of hydropower units that allows a real-time control of technological process, and proposed was the design for a primary measuring transducer of mechanic intensity as a component of the control method proposed, with its transformation equations obtained.
Two techniques for online nodal load (NL) forecasting using preliminary classification of training set data are proposed. In the first one, a pattern recognition method, the rate evaluation algorithm (REM), is applied to measured load values of the previous day to classify load diagram that is being forecasted. Diagrams from resulting class are used to calculate load predictions. In the second technique, measured load values of a diagram from training set, which is the closest to the one being predicted, are used as estimates of predicted load values. Online NL forecasting using the mentioned above methods has been conducted. The corresponding mean square errors are given.
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