The problem of creating a method for clinical prediction of infertility diagnosis and treatment are formulated and solved in the paper. The existing forecasting models for overcoming infertility are considered. Their advantages and disadvantages are defined including the complexity of accounting and forecasting individual possibilities for conception of the estimated married couples, and the conservatism of the medical and computing technologies used, which reduces the quality and effectiveness of forecasts. The structure of infertility after a comprehensive examination of patients over a long period of time is shown. Five groups of patients were identified, taking into account the characteristics, duration and other causes of infertility. The concepts of the Coefficient of Reproductive Activity, the Indicator of Reproductive Health and the Indicator of Reproductive Readiness are introduced, a variant of calculating these values is proposed, and the ranges of their possible values are indicated. Indicator of Reproductive Readiness is proposed as a key characteristic for clinical prognosis in overcoming infertility. Its values can be projected into four groups of outcomes in the diagnosis and treatment of infertility, three of which involve direct medical treatment in a specialized medical institution. The article presents a generalized algorithm for the use of Indicator of Reproductive Readiness in the prognostic activity of a doctor, gives practical recommendations for Indicator using by the patient. A computational experiment was also performed to calculate the values of Indicator for several patients with further analysis of the results obtained.
The harmonics-related voltage characteristics of the simple quarter-wave-symmetric space vector pulse width modulation (QWS-SVPWM) technique for single-phase multilevel voltage source inverter (MLVSI) are presented. The just offered approach applies the integer part of the reference voltage sample as the coordinate of the first modulating space vector and the fractional part as the duty cycle of the second (adjacent) modulating vector. This significantly reduces the computational costs. The considered harmonics factors are the output voltage THD and n-order weighted THDs. It is the latter that are appropriate for the load circuit elements current and voltage THD assessment when the load simplified equivalent circuits are the respective-order ones. Here the range of the voltage amplitude modulation index is considerably extended for the characteristics dependences thanks to using LabVIEW signal simulation model instead of PSIM model of the whole inverter system. The simulation results confirm the low-frequency QWS-SVPWM readiness to provide a high quality supplying loads by the single-phase MLVSI with enough high number of the levels.
The adequacy assessment is a topical tool for planning the progress of electric power systems and includes several important calculation steps, namely: the formation of random states, minimization of power shortages, and determination of reliability indicators. Modern software complexes use various types of models for minimizing power shortages, flow, including linear and non-linear models, as well as appropriate methods for solving problems based on these models. In current paper, differential evolution methods are used to solve nonlinear problems, and three options for adapting the known differential evolution algorithms DE, aDE and jDE to solving the problems are considered. An important part of the work is the analysis of existing and proposed options for modifying the mutation process. Which can be used in the above methods. The main changes include an additional check of compliance of mutant vectors with upper and lower constrains, and in case of their discrepancy, three options for correcting mutant vectors are considered. The experiments performed involved 3 and 7 node systems and showed the advantage of the implemented methods using the correction of the elements of mutant vectors in the form of an increase in the speed of solving problems up to 47% relative to the existing correction method. (Abstract)
Usually in quantum optics, the theory of large- and small-scale waveguide beam splitters is the same. In this paper, it is shown that the theory of the nanoscale waveguide beamsplitter has a significant difference from a similar device, but of a larger scale. It is shown that the previously known theory of the waveguide beam splitter is a particular case of the theory presented here. The wave function at the output ports of the nanoscale beam splitter is analyzed. The results obtained are sensitive to the size of the beam splitter, the coupling parameter of the two waveguides, and the degree of nonmonochromaticity of the photons entering the first and second ports of the beam splitter. The results are important for quantum technologies using a nanosized beam splitter.
The paper is devoted to the analysis of the application of the Rayleigh reflectometry method for fiber-optic sensing. Initially, it was used in optical telecommunications to measure the attenuation profile uniformity of optical fibers. The method involves the insertion of the short probing pulse into the fiber under test. The work analyzes the evolution of pulse propagation along the probed fiber, which lose some of the power in their path due to various attenuation mechanisms, including Rayleigh scattering. Moreover, this work demonstrates a functional connection between the probing pulse energy and the backscatter power signal. The backscattering power is proved to be a purely exponential function of the position along the fiber. The spatial resolution of the reflectometer is determined by the convolution of the probing pulse waveform, the impulse response of the capture and the impulse response of the fiber at the two-way transition from the starting end to the controlled point and backwards. Methods for solving the problem of low levels of Rayleigh scattering signal are proposed. The study analyses the development trends and the scope of application of Rayleigh reflectometry for distributed probing. At the same time, special emphasis is placed on the use in high-speed telecommunication systems. The results of experimental studies indicating the functional capabilities of the fiber-optic sensing method are presented. The method is very effective at the stages of construction and technical operation of fiber-optic communication lines.
