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The paper investigates iterative algorithms for solving the equation according to the Kalendar-Van Dusyn formula, which describes the dependence of the electrical resistance of the Pt100 family sensor on temperature. This family of platinum sensors is considered quasi-linear, but for high-precision measurements the nonlinearity of the sensor cannot be neglected, so it is necessary to solve the nonlinear equation of Pt100. At minus temperatures, the equation according to the Kalendar-Van Dusyn formula reaches the fourth power and has no solution with respect to temperature in an analytical form. The analysis of the previously published iterative algorithm for the approximate solution of the equation reveals a desadvantage of this algorithm. The residual error of the solution is not a monotonic function of the argument, because it contains extrema, moreover, the sign of the error changes to the opposite after each extremum. The purpose of this study was to obtain an algorithm that provides the residual error in the form of a monotonic deterministic function of the argument with the minimization of the maximum error value. The possibility to modify the iterative algorithm-prototype in an elementary way by fixing the number of iterations is shown. The residual error of solving the equation according to the modified algorithm has the form of a monotonic deterministic function of the argument. It is assumed that any iterative calculation algorithm can be improved in this way. At the same time, the minimization of the error values of the modified algorithm is achieved by setting the maximum number of iterations compared to the prototype algorithm. To overcome this desadvantage of the modified algorithm, a new algorithm is proposed, in which, in addition to a fixed number of iterations, the property of the smallness of the components of higher degrees is used. The high efficiency of the new algorithm is shown, which reduces the residual error of the solution to a negligible value in just four iterations. It is claimed that the high efficiency of the new algorithm makes further research in the direction of its improvement unnecessary. The article presents a scheme of the new algorithm and a corresponding program on the VBA platform for Excel, which is suitable for direct use in the software of temperature meters based on Pt100 resistance temperature sensors. References 5, figures 4, tables 3. [ABSTRACT FROM AUTHOR]

Copyright of Radio Electronics, Computer Science, Control is the property of Zaporizhzhia National Technical University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Technical Electrodynamics / Tekhnichna Elektrodynamika is the property of National Academy of Sciences of Ukraine, Institute of Electrodynamics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The article presents data on the association of the rs1800012 polymorphism of the procollagen type I alpha (α) 1 COL1A1 gene and the stigma of non-differentiated connective tissue dysplasia with the development of vaginal prolapse in the Ukrainian population. The objective: to determine the prognostic significance of the rs1800012 polymorphism of the procollagen type I alpha (α) 1 COL1A1 gene and the clinical and anamnestic stigmata of non-differentiated connective tissue dysplasia as factors associated with the development of vaginal prolapse in the Ukrainian population. Materials and methods. In order to achieve the research aim, polymorphism in the rs1800012 locus of the COL1A1 gene was studied by polymerase chain reaction in venous blood samples of 120 women. The main group included 60 patients with vaginal prolapse III, IV, who had indications for surgical correction; to the comparison group – 60 women without pelvic floor dysfunction. The diagnostic algorithm included a physical examination, taking the general and gynecological history, evaluation of the state of the pelvic floor and urogenital dysfunction. The severity of pelvic floor prolapse was assessed based on the Pelvic Organ Prolapse Quantification (POP-Q) classification. Results. During the analysis of clinical and anamnestic data in women of both research groups, concomitant pathology with a possible connection with signs of non-differentiated connective tissue dysplasia was identified as risk factors for the development of pelvic floor dysfunction: 37 people in the main group versus 21 patients in the comparison group (x² =8.5428; p=.003469). The prevalence of rs1800012 polymorphism of the gene procollagen type I alpha (α) 1 COL1A1 in the homozygous variant (TT) in this study was found in the main group in 8 samples (13.33%) and only in 2 (3.33%) – in the comparison group. The presented polymorphism in the heterozygous variant (GT) in the main group was determined in 19 samples (31.67%) and only in 12 (20.00%) – in the comparison group (x² =7.3199; p=.025734). Conclusions. The association of the rs1800012 polymorphism in the COL1A1 gene (p=.025734) and clinical and anamnestic stigmata of non-differentiated connective tissue dysplasia (NDST) (p=.003469) with the development of pelvic organ prolapse was established, which is evidence of the importance of genetic changes and connective tissue remodeling in the etiology of genital prolapse The presence of NDST stigma increases the risk of pelvic organ prolapse by 3 times (OR=3.788; 95% CI: 1.664–8.624), polymorphism rs1800012 in the COL1A1 gene – by 2 times with the heterozygous variant (OR=2.400; 95% CI: 1.230–6.633) and 3 times with the homozygous variant (OR=3.275; 95% CI: 1.300–19.969). [ABSTRACT FROM AUTHOR]

Copyright of System Research & Information Technologies / Sistemnì Doslìdžennâ ta Ìnformacìjnì Tehnologìï is the property of Institute for the Applied System Analysis at the NTUU KPI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of System Research & Information Technologies / Sistemnì Doslìdžennâ ta Ìnformacìjnì Tehnologìï is the property of Institute for the Applied System Analysis at the NTUU KPI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Purpose. Development of methodology and experimental studies of the layout of the active screening of technogenic power frequency magnetic fields with different control algorithms with a single coil magnetic executive body. Methodology. In the course of mathematical modeling to determine geometrical size of the magnetic coil executive body based on the size of the protected area, and the configuration of the coil magnetic executive body is determined based on the required uniformity of the magnetic field distribution in the protected area. Results. Experimental studies of open, closed and combined systems of active screening of technogenic power frequency magnetic fields with a single coil magnetic executive body. Originality. For the first time experimentally confirmed the possibility of reducing the level of induction of man-made power frequency magnetic fields in a given area 3-5 times with a single coil magnetic executive body.. The possibility of reducing the level of the magnetic field in a limited area of the space by 15-20 times Practical value. On the basis of the calculations the layout of active screening of technogenic power frequency magnetic fields with different control algorithms with a single coil magnetic executive body has been made. [ABSTRACT FROM AUTHOR]