Anisotropic Strain on GaN Microdisks Grown by Plasma-Assisted Molecular Beam Epitaxy

Lattice relaxation on wurtzite GaN microdisks grown by plasma-assisted molecular beam epitaxy was systematically studied. The lattice constants of GaN microdisks were evaluated from high-resolution transmission electron microscopy, and the anisotropic strain was then analyzed by observing the microscopic atomic layers. We found that the vertical lattice strain along the c-axis followed a linear relationship, while the lateral lattice strain along the a-axis exhibited a quadratic deviation. The lattice mismatch is about 0.94% at the interface between the GaN microdisks and the γ-LiAlO2 substrate, which induces the anisotropic strain during epi-growth.

Simulation of the Effect of Turning Steering Wheel Intensity on the Vehicle Stability

In this article, a mathematical model has been developed to show the effect of the drivers’ steering wheel turning intensity on the vehicle’s stability. The developed mathematical model was compared with the results of experiment and its adequacy was evaluated. 3 conditional drivers turn the steering wheel of the vehicle at different speeds. When the conditional drivers were analyzed in the “J-turn” maneuver, it was determined that the indicators of 1,2,3 - conditional drivers are close to the standard. The conditional 2-driver recorded an indicator close to the standard. As for the “Single Lane Change” maneuver, the value of the smallest quadratic deviation from the trajectory of conditional 1-driver was recorded, the correlation index was equal to 0.102, respectively, 0.88

Titrimetric method determination of the content of the mass part of siliciumin feed additives

The results of the development of the method for determining the mass fraction of silicium in powder samples of feed additives by the titrimetric method are presented in the article. The implementation and validation of the method was carried out with the use of feed additive of mixed type "Mikasil" produced by LLC «Globus», Ukraine. The procedure was reproduced ten times with the determination of the mass fraction of siliciumin two parallel samples. The method is based on the precipitation of silicic acid in the form of silicium-fluoride of potassium, followed by hydrolysis with hot water in the presence of chlorous calcium. The isolated hydro-chloric acid in an amount equivalent to the content of hydro-fluoric acid is titrating with alkali solution in the presence of an indicator. The results of the studies showed that the specified method for determining the mass fraction of silicium meets the standards of accuracy control for this method, namely the standard quadratic deviation (σ) is 0.52, when norm up to 0.7, when determined in two parallel samples. The results obtained indicate that the titrimetric method for determining the mass fraction of silicium in powder samples of feed additives is accurate, reliable, reproducible and economically available.

Studying Innovation as the Factor in Professional Self-Development of Specialists in Physical Education and Sport

Lifetime employment of specialists in physical education and sport is possible only under the conditions of enhancing their professional self-development, whose essential component is innovative activity. The article aims to identify the current level of innovation of professional activities of specialists in physical education and sport. It is also essential to determine the main characteristics of the innovation indicator during professional self-development of specialists in physical education and sport. The selected psychodiagnostic methods have made it possible to diagnose specialists in physical education and sport and reveal the main characteristics of the innovation indicator, namely, average, quadratic deviation, asymmetry and excess. The paper also used following methodologies: self-efficacy diagnosis, the level of subjective control and the style of response to changes. The research sample comprised of specialists in physical education and sport of different age groups, with different experience and qualification degree. In total, the study involved 209 participants. The total dispersion of the selected factors for the research groups with a prevailing conservative style is approximately 61%. The development of capability for innovation in specialists in physical education and sport involves enhancing their psychological qualities such as particular sensitivity to professional changes, readiness to take risks and be responsible for possible failures, independent judgment while taking professional decisions, focus on personal and professional self-development, willingness to search for new professional ideas.

MODELO MATEMÁTICO PARA DETERMINAÇÃO DO DIÂMETRO ECONÔMICO DE TUBULAÇÕES DE RECALQUE

MODELO MATEMÁTICO PARA DETERMINAÇÃO DO DIÂMETRO ECONÔMICO DE TUBULAÇÕES DE RECALQUE BRUNA DALCIN PIMENTA1; ADROALDO DIAS ROBAINA1; MARCIA XAVIER PEITER1; JHOSEFE BRUNING1; MIGUEL CHAIBEN NETO1 E YESICA RAMIREZ FLORES1 1Programa de Pós-Graduação em Engenharia Agrícola, Universidade Federal de Santa Maria/RS, Av. Roraima, nº 1000, Bairro Camobi, Santa Maria/RS, Brasil, CEP 97105-900, [email protected], [email protected], [email protected], [email protected], [email protected], [email protected]. 1 RESUMO O conhecimento do diâmetro econômico de tubulações é de grande importância em dimensionamentos de sistemas de recalque, pois, assim, é possível otimizar os custos de sistemas de irrigação. O objetivo deste trabalho foi propor um modelo matemático para o cálculo do diâmetro econômico de tubulações de recalque utilizadas em sistemas de bombeamento de água para irrigação. Na modelagem matemática do cálculo do diâmetro econômico foi utilizada, para mensurar a perda de carga, a equação de Hazen-Williams, levando em consideração o custo das tubulações, o custo do conjunto motobomba, o custo da energia consumida e o fator de recuperação do capital. Nas simulações foram utilizadas vazões de 25 a 500 l s-1, em intervalos de 25 l s-1, fator de recuperação do capital de 10, 15 e 20%, e preço da energia consumida de US$0,09, US$0,10 e US$0,11 kWh-1, para tubos de aço com espessura de 2,00mm, 2,65mm e 3,00mm. Para validação do modelo proposto, por meio da comparação com um modelo que utiliza a formulação de Darcy-Weisbach, foram utilizadas a raiz média do desvio quadrático, a raiz média do desvio quadrático normalizado, a eficiência do modelo e o índice geral de desempenho do modelo. Os resultados indicam que o modelo proposto apresenta índice geral de desempenho próximos a 1,00 em todos os cenários, podendo, dessa forma, ser utilizado com precisão para determinação do diâmetro econômico de tubulações de recalque sem necessidade do uso de equações que necessitam de processos iterativos para sua solução. Palavras-chave: modelagem, irrigação, consumo de energia, Hazen-Williams. PIMENTA, B. D.; ROBAINA, A. D.; PEITER, M. X.; BRUNING, J.; CHAIBEN NETO, M. E FLORES, Y. R. MATHEMATICAL MODEL FOR DETERMINING THE ECONOMIC DIAMETER OF PRESSURIZED PIPES 2 ABSTRACT The knowledge of the economic diameter of pipelines is of great importance in the design of water pumping systems because it makes possible to optimize costs of irrigation systems. The objective of this work was to propose a mathematical model for the calculation of the economic diameter of pressurized pipes used in water pumping systems for irrigation. In the economic diameter calculation mathematical modeling Hazen-Williams equation was used to measure loss of load, taking into account the pipes’ cost, the cost of the motor pump, the cost of the energy consumed and the recovery factor of the capital. In the simulations, flow rates of 25 to 500 l s-1 were used, in intervals of 25 l s-1, capital recovery factor of 10, 15 and 20%, and energy price of US$0.09, US$0.10 and US$0.11 kWh-1, for steel pipes with thickness of 2.00mm, 2.65mm and 3.00mm. For validation of the proposed model, through comparison with a model using Darcy-Weisbach formulation, the mean root of the quadratic deviation, the mean root of the normalized quadratic deviation, the model efficiency and the overall performance index of the model were used. The results indicate that the proposed model presents a general index of performance close to 1.00 in all scenarios and can therefore be used with precision to determine the economic diameter of pressurized pipes without the use of equations that require processes solutions. Keywords: modeling, irrigation, energy consumption, Hazen-Williams.

Ovarian characteristics in the fetal period: topographic and morphometric parallels

Defects of the urinary system take the 3rd place by their occurrence including 6% of developmental defects of the female reproductive organs. Therefore modern studies in the field of perinatal anatomy are of a special importance. Objective of the study was to determine age peculiarities in the structure and topography of the fetal ovaries as well as similar and different tendencies in changes of the ovarian morphological parameters of the two groups of fetuses, remote in time. The study was conducted in the two groups of human fetuses, 4-10 months of development, 161.0-500.0 mm of the parietal-calcaneal length. The first group consisting of 35 specimens divided into 7 subgroups according to the month of development (4, 5, 6, 7, 8, 9 and 10), was formed with fetuses died during 2017-2019 years. The second group included specimens of fetuses collected during 1970-1990. The obtained results were statistically processed in the licensed statistical package “Statistica 6.0”. The character of distribution for every obtained variation lines, mean values for every sign, standard quadratic deviation, percentile scope of the parameters were evaluated. Reliability of differences in the indices between independent quantitative values was determined by means of Mann-Whitney U-criterion. The conducted study determined that the ascending position of the ovaries in the early fetuses can be considered normal for the given age group, though the topography is indicative of developmental retardation at the late stages of perinatal development. The length of the ovary in both groups increases gradually from the 4th to the 10th month with a certain delay during the 6th month. It might be associated with intensified growth of its parenchyma, and intensive increase of its width and length respectively. The majority of the ovarian parameters of 9-10 month fetuses do not differ reliably, which is indicative of a complete development of the ovarian definite structure at the 9th month of the intrauterine development. Comparison of the parameters of the two groups of fetal specimens, remote in time, is indicative of the fact that in the majority of the parameters they do not differ. Although in modern studies the length of the right ovary in 8-month fetuses, and the length of the left ovary in 7-month fetuses is shorter than that of the archival specimens. Similarly the width of the left ovary in 4-month fetuses appears to be reliably shorter than that of the archival specimens. The thickness of the right ovary of 7 and 10-month modern fetuses is reliably less than that of the appropriate groups of the archival specimens. The thickness of the left ovary of modern fetuses is reliably less than that of the archival specimens during the 10th month. Therefore, a reliable difference was found only in 2 pairs of the parameters included in 42 pairs of the examined morphometric parameters of both groups. It is indicative of inconsiderable changes of these parameters during the period of 27-49 years.

Regulation of Requirements for Quality Indicators of Paint Covering

We adduce the information about methodology of decision-making on conformity of quality of the painted surface of building products and constructions to the established requirements. General methodology consists of obtaining, analyzing the facts on the normalized indicator and calculation and establishment of the norm.When calculating the allowed value of the adhesive strength can be determined for 3-σ deviation from mathematics expectation. The maximum permissible values of average-quadratic deviation should be determined by standard value coefficient of variation. Formulas are given for determining the permissible value of the coefficient of variation. The normative values of the coefficients of variation for some protective and decorative coatings are given

Clinical and morphological aspects of myocardial damage and cardioprotection in patients with leukemia

Myocardial damage in the background of leukemia is considered as a manifestation of the disease and various types of therapy. It is noted that myocardial damage in this category of patients is the result of multifactorial effects on the myocardium in the oncohematologic patient. The problem of cardioprotection is quite actively studied in order to develop effective prophylaxis and reduce the cardiotoxicity of the most common groups of cytostatic drugs. Purpose — to investigate the features of myocardial damage in patients with leukemia and the prospects of therapeutic intervention. A comprehensive clinical and laboratory study was conducted for 92 patients with leukemia who were on examination and treatment in the hematological department of the Vinnitsa Regional Clinical Hospital named after M.I. Pirogov and received cytostatic therapy in accordance with the nosology and protocol of medical care of the Ministry of Health of Ukraine. Additionally, patients were screened for quality of life indicators according to the methods proposed by us. The statistical processing of the obtained results was carried out in the license package “STATISTICA 6.1” with the use of nonparametric methods for evaluating the obtained results. Evaluated the correctness of the distribution of characteristics for each of the variation series received, the mean of each studied feature, and the standard quadratic deviation. The reliability of the difference between independent quantitative values was determined using the Man-Whitney U-criterion. Signs of myocardial damage were detected in all patients prior to cytostatic therapy. The analysis of medical correction of myocardial damage in patients is carried out. All patients received metabolic therapy in the form of Meldonium, Arginine, Tivortin and aspartic acid. However, these appointments were not standardized, which did not allow to assess the effectiveness of their appointment. Therapy for heart failure was performed by metabolic, diuretic, accompanied by clinical and laboratory improvement. Prospects of standardization of pharmacological cardioprotection in patients with leukemia are considered.

METHODOLOGICAL RECEPTION FOR DETERMINATION OF DICAMBA RESIDUES IN SOYBEANS BY GC-MS

Introduction. In this paper, there are presented results of investigations on the development and validation of the method for the determination of dicamba residues in import foodstuff (soybeans). The identification and quantitative determination of dicamba are performed by capillary gas-liquid chromatography with mass-selective detection (ionization-electron impact). Material and methods. The stages of sample preparation include four steps as extraction with acidified acetonitrile, followed by the filtration and evaporation; freezing the sample with filtration and evaporation; dissolving the dry residue in a mixture of acetone: water (1:20); purification by repeated redistribution in a system of immiscible solvents under varying the pH of the aqueous medium (pH 9-10: dichloromethane, hexane, pH 2: hexane-tert-butyl methyl ether). The chromatographic measurement was preceded by the derivatization of the acid to the corresponding methyl ester by the treatment with a solution of diazomethane in diethyl ether Results. The lower limit of the quantitative evaluation of dicamba in samples of soybean beans is of 0.01 mg/kg, the signal-to-noise ratio at the detection limit accounts of 20:1. The completeness of extraction of dicamba, established on the basis of analysis of model samples with the introduction of a substance at four points within the defined range, amounted to 85-95%. The average quadratic deviation of the repetition varies in the range of 3.3-4.9%. Discussion. The use of diethyl ether containing dibutylhydroxytoluene (6 ppm) as a stabilizer, as well as the interfering effect of phthalates, led to the formation of poorly resolved peaks of the methyl ester of dicamba, dibutylhydroxytoluene, and dibutyl phthalate. The combination of the use of different methods of data collection (in the scanning mode and in the mode of recording individual ions) made it possible to identify these components. Replacement of the used diethyl ether, as well as variation of chromatographic conditions, for separation of dicamba and phthalate peaks, made it possible to achieve the necessary selectivity of detection of the analyte.

Optimum prediction of atmospheric temperature using GPS radio occultation measurements

The matters of optimum forecasting atmospheric temperature using GPS radio occultation measurements are considered. The analysis of the available data regarding to the comparison of temperature measurements using radio occultation method and radiosondes was made. As a result it was concluded that the mean value of those results’ difference and also the mean quadratic deviation of these difference increases in common by increase of the forecasting time. In order to prevent surplus loading of telemetry channels and broadcasting inaccurate forecast values via them the optimization of general procedure of radio occultation temperature measurements are carried out using fine functions method. For optimization the concurrent parameters, changing on antiphase order are determined. It is found out that utilization of fine function method taking into account the applied optimization criterion and some limitation conditions make it possible to optimize the whole procedure of forecasting atmospheric temperature using the GPS radio occultation measurements.