Results Of Measurements Research Articles

Spin‐Thermoelectric Generation Associated with Magnetization Dynamics in the Insulator‐Based Generators Fabricated from Liquid Phase Epitaxial Yttrium Iron Garnet, Bi‐Substituted YIG and Bi‐ and Al‐Substituted YIG Films

An insulator‐based spin‐thermoelectric (STE) generator is composed of a thin paramagnetic metal (PM: Pt) layer for generating the STE voltage VSTE via the inverse spin Hall effect and a ferrimagnetic insulator (FMI) film or slab used for producing spin‐wave spin currents due to a temperature gradient . Yttrium iron garnet (YIG) is a key material used for the FMI of STE generators. We examined in detail the ferromagnetic resonance (FMR) properties of YIG (Y3Fe5O12), Bi‐substituted YIG (Y3‐xBixFe5O12) and Bi‐ and Al‐substituted YIG (Y3‐xBixFe5‐yAlyO12) films grown by liquid phase epitaxy (LPE). Bi‐substituted YIG films exhibited the large FMR damping and high STE voltage when the films were incorporated in the STE generator. The LPE‐grown Y2.35Bi0.65Fe5O12 film exhibited the FMR linewidth ΔH of 30 mT and the VSTE of 70 μV for the ∇T of . This paper comprehensively presents the origin of the STE generation in the insulator‐based generators on the basis of the results of FMR and STE measurements. To clarify the origin of STE generation in the generators fabricated from single crystal YIG (YIG, Bi‐substituted YIG and Bi‐ and Al‐substituted YIG) films grown by LPE, three principal factors are explained: (a) thermal energy transfer from the phonon system to the spin system, which strengthens the heat excitation of spin precession, through the spin–orbit coupling enhanced by the growth‐induced magnetic anisotropy of LPE‐grown YIG films, (b) in the YIG films incorporated in the STE generators, the generation of spin‐wave spin currents owing its origin to the ferromagnetic spin exchange interaction acting between neighboring spins due to , and (c) how the spin currents pumped into the Pt layer from the YIG film at the Pt/YIG bilayer interface are affected by the magnetization processes of single crystal YIG films. It is concluded that the STE generation of insulator‐based STE generators can be explained from a viewpoint of the spin dynamics under the effect of in the Pt/YIG bilayer structure. © 2024 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

Atomistic modeling of electric field poling of PMMA-based polymer material with guest quinoxaline chromophores

The effect of applied electric field strength on the chromophore alignment in composite PMMA-based material is studied by atomistic modeling. Polymer material of real density (1.07 g/cm3), established in the course of modeling using NPT protocol, is considered along with model materials with reduced density (0.6 and 0.9 g/cm3), applied fields ranging from 100 to 1000 V/μm. Glass transition temperature, at which materials simulation was performed, was estimated in the course of multistage simulation. Simulation was performed with OPLS3e force field. Both centric, 〈P2〉, and acentric, 〈cos3Θ〉, chromophores order parameters were estimated. For the polymer material with high density, ρ = 1.07 g/cm3, the value of the order parameter 〈cos3Θ〉 grows from 0.25 to 0.30 for field strength varying from 300 to 1000 V/μm; the values of 〈P2〉 for chromophores are in agreement with the results of measurements by UV–vis spectroscopy. The obtained values of order parameters (both 〈P2(ch)〉 and 〈cos3Θ〉 for model materials with decreased density (0.6 and 0.9 g/cm3) are quite close to each other and seem to be overestimated compared to the values for the material with high density; this observation is in agreement with calculated values of free volume in the composite. The applied approach may provide guidelines for the elaboration of optimal poling protocols used at the development of composite polymer materials with quadratic nonlinear optical properties, containing quinoxaline chromophores-guests possessing high dipole moments (more than 20 D).

An algorithm for determining the geometric parameters of the aperture of an on-board deployable antenna system in an orbital flight

Earth remote sensing complexes placed on light-class spacecraft may have a radiating aperture size of the antenna system exceeding the specified dimensional limits, therefore such antenna system are placed on a multi-section frame. Their design feature is the ability to unfold in space after being put into orbit, which makes it possible to significantly increase the size of the aperture and, as a result, improve the quality of scientific and target remote sensing information. During deployment and in the conditions of orbital flight, under the influence of destabilizing factors of outer space, a distortion of the distribution of amplitudes and phases at the antenna aperture can be observed, which is caused, among other things, by a distortion of geometric parameters caused by a change in the position of the sections of the speaker relative to each other within the tolerances of the aperture installation. In this regard, it is an urgent task to determine the geometric parameters of the aperture of the speaker according to ground measurements, which can be compensated by adjusting the weight coefficients in a multi-channel speaker or by mechanically rotating the sections, depending on the available capabilities. Reducing the influence of destabilizing factors of the deployment of a multi-section radiating aperture on the directional pattern of the antenna system in orbital flight conditions. An algorithm is proposed for determining the geometric parameters of the deployment of the deployed antenna system in the conditions of orbital flight, which allows calculating the angles of the mutual position of the sections based on ground measurements. The main advantage of the developed algorithm is that it does not require measurements of directional patterns at the gain scale or measurement of complex readings of the directional pattern, which require high-precision certified stands. To successfully correct the parameters of the on-board antenna, it is enough to have the results of amplitude measurements. The application of the developed algorithm will make it possible to effectively use the energy potential of space-based on-board radio engineering complexes using large-sized deployable antenna arrays as antenna systems by determining and compensating for the influence of distortions in the geometric parameters of the aperture.

Calibrating ultrasonic sensor measurements of crop canopy heights: a case study of maize and wheat.

Canopy height serves as an important dynamic indicator of crop growth in the decision-making process of field management. Compared with other commonly used canopy height measurement techniques, ultrasonic sensors are inexpensive and can be exposed in fields for long periods of time to obtain easy-to-process data. However, the acoustic wave characteristics and crop canopy structure affect the measurement accuracy. To improve the ultrasonic sensor measurement accuracy, a four-year (2018-2021) field experiment was conducted on maize and wheat, and a measurement platform was developed. A series of single-factor experiments were conducted to investigate the significant factors affecting measurements, including the observation angle (0-60°), observation height (0.5-2.5 m), observation period (8:00-18:00), platform moving speed with respect to the crop (0-2.0 m min-1), planting density (0.2-1 time of standard planting density), and growth stage (maize from three-leaf to harvest period and wheat from regreening to maturity period). The results indicated that both the observation angle and planting density significantly affected the results of ultrasonic measurements (p-value< 0.05), whereas the effects of other factors on measurement accuracy were negligible (p-value > 0.05). Moreover, a double-input factor calibration model was constructed to assess canopy height under different years by utilizing the normalized difference vegetation index and ultrasonic measurements. The model was developed by employing the least-squares method, and ultrasonic measurement accuracy was significantly improved when integrating the measured value of canopy heights and the normalized difference vegetation index (NDVI). The maize measurement accuracy had a root mean squared error (RMSE) ranging from 81.4 mm to 93.6 mm, while the wheat measurement accuracy had an RMSE from 37.1 mm to 47.2 mm. The research results effectively combine stable and low-cost commercial sensors with ground-based agricultural machinery platforms, enabling efficient and non-destructive acquisition of crop height information.

Electrochemical Behaviour of an Au-Ge Alloy in an Artificial Saliva and Sweat Solution

In modern times, more and more different materials (including alloys) are in direct contact with human electrolytes (sweat, saliva, lymph, blood, etc.). One of the most important properties for the use of these materials is therefore their chemical inertness or resistance to corrosion when they are in contact with human electrolytes. Consequently, during the development of such new materials, it is necessary to study and understand their basic electrochemical behaviour in a given environment. The purpose of this research was to monitor the electrochemical behaviour of the new Au-Ge alloy in artificial sweat and artificial saliva solutions, depending on the electrolyte composition and exposure time. This new alloy represents a potential material for use in dentistry or for jewellery. The obtained results of the study show that the immersion time and the pH value have a significantly greater influence on the corrosion resistance of the new Au-Ge alloy than the composition of the electrolyte solution. The results of the SEM/EDX analysis additionally confirm the main results of the electrochemical measurements.

ANATOMICAL STRUCTURE AND MORPHOMETRY OF THE LUNGS OF BALI DUCKS IN THE GROWER PHASE

The lungs are an organ that functions as a place for air exchange, where the incoming air will be used for combustion and energy production. Poultry lungs contain three main elements, namely primary bronchi, secondary bronchi and parabronchi. This study aims to determine the structure and morphometry of new lungs of bali ducks (Anas sp.) of different sexes in the growing phase. This research used 18 balinese ducks which were divided into 2 groups, namely male and female with 9 each (three months old). Anatomical structure examination was carried out by direct observation and histological structure using a binocular light microscope. The results of the anatomical and histological structure data were analyzed using descriptive qualitative analysis, while the morphometric data were analyzed using the Independent Sample T-Test. The anatomical structure of the bali duck's lungs is trapezoidal with conical ends, firmly attached to the thorax, stiff and pink in color, consisting of primary bronchi, secondary bronchi and many parabronchi. The parabronchi consist of the parabronchial wall, parabronchial lumen, septa, arteries/veins, atria, blood capillaries and air sacs. The results of lung morphometry measurements of bali ducks showed that there were no significant differences (P&gt;0.05) in weight, volume, length and width. The results of histomorphometric measurements on the area of the parabronchi, thickness of the parabronchi walls and septa showed significant differences (P&lt;0.05) in the two sexes. There is no difference in the anatomical structure and histology of the lungs of male and female Bali ducks, but there are differences in morphometry. There is no difference in the anatomical structure of the lungs between male and female balinese ducks in the grower phase, no difference in macro morphometry, but in histomorphometric examination there are differences in parabronchial area and septa width, there is no difference in the thickness of the parabronchial walls of male and female Balinese ducks in the grower phase.female Bali ducks are the same, but there are differences in morphometry.

Thigh muscle mass evaluated by point-of-care ultrasound is associated with short-term mortality in patients with sepsis in the emergency department

Muscle mass depletion is associated with mortality and morbidity in various conditions including sepsis. However, few studies have evaluated muscle mass using point-of-care ultrasound in patients with sepsis. This study aimed to evaluate the association between thigh muscle mass, evaluated using point-of-care ultrasound with panoramic view in patients with sepsis in the emergency department, and mortality. From March 2021 to October 2022, this prospective observational study used sepsis registry. Adult patients who were diagnosed with sepsis at the emergency department and who underwent point-of-care ultrasounds for lower extremities were included. The thigh muscle mass was evaluated by the cross-sectional area of the quadriceps femoris (CSA-QF) on point-of-care ultrasound using panoramic view. The primary outcome was 28 day mortality. Multivariable Cox proportional hazard model was performed. Of 112 included patients with sepsis, mean CSA-QF was significantly lower in the non-surviving group than surviving group (49.6 [34.3–56.5] vs. 63.2 [46.9–79.6] cm2, p = 0.002). Each cm2 increase of mean CSA-QF was independently associated with decreased 28 day mortality (adjusted hazard ratio 0.961, 95% CI 0.928–0.995, p = 0.026) after adjustment for potential confounders. The result of other measurements of CSA-QF were similar. The muscle mass of the quadriceps femoris evaluated using point-of-care ultrasound with panoramic view was associated with mortality in patients with sepsis. It might be a promising tool for determining risk factors for mortality in sepsis patients in the early stages of emergency department.

INCREASING THE ACCURACY OF THE POWER LINES MODELING BASED ON PMU

The article discusses the modeling of power lines based on PMU data to assess the state of overhead lines. Current approaches to solving the problem are analyzed. The advantages and disadvantages of these approaches are presented. It has been established that when modeling power lines are traditionally represented in the form of a - circuits scheme, which leads to methodological modeling errors. To reduce the methodological error of modeling, overhead lines (OHLs) can be presented in the form of equations with distributed parameters, which allows for maximum accuracy. However, distributed line equations contain hyperbolic functions and reduce performance in real-time simulations. Based on this, it is noted that the selection of an adequate mathematical model of overhead lines with the appropriate accuracy of synchronized vector measurements in real time when assessing the state of power lines is an important stage of modeling. The article discusses overhead line models using equations with distributed parameters, a -circuits, an equivalent - circuits and chain -circuits depending on the number of links. The results of calculating the mode based on the modeling accuracy using the example of a 500 kV overhead line are presented, as well as the results of comparing various equivalent circuits. It is shown that when modeling overhead line modes based on the results of PMU measurements, representing power lines as chain circuits with links 50 km or less in length is appropriate, since it makes it possible to obtain a model accuracy that is adequate to the PMU measurements. Methodological errors in modeling ultra-high voltage transmission lines using the equations of long lines have been studied. The obtained results can be used for monitoring, analysis and operational management of the electric power system

Ce3Bi4Ni3 – A large hybridization-gap variant of Ce3Bi4Pt3

The family of cubic noncentrosymmetric 3-4-3 compounds has become a fertile ground for the discovery of novel correlated metallic and insulating phases. Here, we report the synthesis of a new heavy fermion compound, Ce3Bi4Ni3. It is an isoelectronic analog of the prototypical Kondo insulator Ce3Bi4Pt3 and of the recently discovered Weyl-Kondo semimetal Ce3Bi4Pd3. In contrast to the volume-preserving Pt-Pd substitution, structural and chemical analyses reveal a positive chemical pressure effect in Ce3Bi4Ni3 relative to its heavier counterparts. Based on the results of electrical resistivity, Hall effect, magnetic susceptibility, and specific heat measurements, we identify an energy gap of 65–70 meV, about eight times larger than that in Ce3Bi4Pt3 and about 45 times larger than that of the Kondo-insulating background hosting the Weyl nodes in Ce3Bi4Pd3. We show that this gap as well as other physical properties do not evolve monotonically with increasing atomic number, i.e., in the sequence Ce3Bi4Ni3−Ce3Bi4Pd3−Ce3Bi4Pt3, but instead with increasing partial electronic density of states of the d orbitals at the Fermi energy. This work opens the possibility to investigate the conditions under which topological states develop in this series of strongly correlated 3-4-3 materials. Published by the American Physical Society 2024

Study of Acoustic Prototypes Based on Plastic Cap Waste

This paper presents the initial prototypes of solutions designed using plastic caps, seeking acoustic applications for both airborne sound insulation and the acoustic conditioning of rooms. Plastic caps are a waste product from the packaging sector and they constitute a major waste problem, given that, if they are not attached to the packaging, they get lost during the recycling cycle and end up in landfill. Finding an application for this waste that can provide acoustic improvements is a sustainable alternative. This paper shows the results of airborne sound insulation measurements obtained in a scaled transmission chamber and sound absorption measurements obtained in a scaled reverberation chamber for different combinations of single and double plastic caps and combinations with thin sheets of sustainable materials, such as jute weaving, textile waste, hemp felt and cork board. Tests have shown that obtaining sound reduction index values of up to 20 dB is possible with plastic cap configurations, or even up to 30 dB is possible at some frequencies with combinations of caps and certain eco-materials. With regard to the sound absorption coefficient tests, close to unity absorption values have been achieved with the appropriate configuration at frequencies that can also be selected. The results indicate that these panels can be eco-solutions for airborne sound insulation as lightweight elements, or they can be used for the conditioning of rooms, tailoring the sound absorption maximums to the desired frequencies.

METHOD FOR GENERATING A DATA SET FOR TRAINING A NEURAL NETWORK IN A TRANSPORT CONVEYOR MODEL

The object of research is a stochastic input flow of material coming in the input of a conveyor-type transport system. Subject of research is the development of a method for generating values of the stochastic input material flow of transport conveyor to form a training data set for neural network models of the transport conveyor. The goal of the research is to develop a method for generating random values to construct implementations of the input material flow of a transport conveyor that have specified statistical characteristics calculated based on the results of previously performed experimental measurements. The article proposes a method for generating a data set for training a neural network for a model of a branched, extended transport conveyor. A method has been developed for constructing implementations of the stochastic input flow of material of a transport conveyor. Dimensionless parameters are introduced to determine similarity criteria for input material flows. The stochastic input material flow is presented as a series expansion in coordinate functions. To form statistical characteristics, a material flow implementation based on the results of experimental measurements is used. As a zero approximation for expansion coefficients, that are random variables, the normal distribution law of a random variable is used. Conclusion. It is shown that with an increase in the time interval for the implementation of the input material flow, the correlation function of the generated implementation steadily tends to the theoretically determined correlation function. The length of the time interval for the generated implementation of the input material flow was estimated.

Comparison of Mechanical Property Simulations with Results of Limited Flexural Tests of Different Multi-Layer Carbon Fiber-Reinforced Polymer Composites.

This article is focused on the experimental study of flexural properties in different multi-layer carbon fiber-reinforced polymer (CFRP) composites and correlations with the results of finite element method (FEM) simulations of mechanical properties. The comparison of the results shows the possibility of reducing the number of experimental specimens for testing. The experimental study of flexural properties for four types of carbon fiber-reinforced polymer matrix composites with twill weaves (2 × 2) was carried out. As input materials, pre-impregnated carbon laminate GG 204 T and GG 630 T (prepreg) and two types of carbon fiber fabrics (GG 285 T and GG 300 T (fabric)) were used. Multi-layer samples were manufactured from two types of prepregs and two types of fabrics, which were hand-impregnated during sample preparation. The layers were stacked using same orientation. All specimens for flexural test were cut with the longer side in the weft direction. Pre-impregnated carbon laminates were further impregnated with resin DT 121H. Carbon fabrics were hand-impregnated with epoxy matrix LG 120 and hardener HG 700. To fulfill the aim of this research, finite element method (FEM)-based simulations of mechanical properties were performed. The FEM simulations and analysis were conducted in Hexagon's MSC Marc Mentat 2022.3 and Digimat 2022.4 software. This paper presents the results of actual experimental bending tests and the results of simulations of bending tests for different composite materials (mentioned previously). We created material models for simulations based on two methods-MF (Mean Field) and FE (Finite Element), and the comparative results show better agreement with the MF model. The composites (GG 285 T and GG 300 T) showed better flexural results than composites made from pre-impregnated carbon laminates (GG 204 T and GG 630 T). The difference in results for the hand-impregnated laminates was about 15% higher than for prepregs, but this is still within an acceptable tolerance as per the reported literature. The highest percentage difference of 14.25% between the simulation and the real experiment was found for the software tool Digimat FE 2022.4-GG 630 T composite. The lowest difference of 0.5% was found for the software tool Digimat MF 2022.4-GG 204 T composite. By comparing the results of the software tools with the results of the experimental measurements, it was found that the Digimat MF 2022.4 tool is closer to the results of the experimental measurements than the Digimat FE 2022.4 tool.

Acrylamide Cross‐Linked Psyllium Polysaccharide with Improved Flocculation Performance for the Removal of Microplastics from Water

AbstractThis article presents a novel material of acrylamide (AM) cross‐linked psyllium polysaccharides (PLP) derivative, PLP‐AM, which can be used as an effective polymeric flocculant for the removal of microplastics (MP) from water. PLP‐AM was produced by radical polymerization of PLP and AM using microwave irradiation instead of conventional radical initiators. The characterization of PLP‐AM was carried out by FT‐IR spectroscopy, elemental analysis, intrinsic viscosity measurement and thermogravimetric analysis (TG). Polystyrene (PS), polyethylene terephthalate (PET) and polyvinyl chloride (PVC) were utilized to examine the flocculation performance of PLP‐AM. The optimum flocculation conditions were obtained by the comprehensive exploration of flocculant concentration, solution pH and temperature. In a solution with a pH 6 at 30 °C, the maximum removal percentages of PS and PVC by 60 mg/L of PLP‐AM were 92.55 % and 94.31 %, respectively, while 93.85 % of the maximum removal of PET percentage could be obtained by 80 mg/L of PLP‐AM. The results of zeta potential measurement revealed that there was adsorption electric neutralization between MP and PLP‐AM besides the adsorption bridging mechanism. These results suggest that PLP‐AM may bring an inspiration for the development of polymer flocculant to remove MP from water.

Assessment of Changes in Water Quality of Enim River, Muara Enim, South Sumatera, Indonesia to Determine Environmental Designations

Enim river flows within several sub-districts in Muara Enim Regency, including Semendo Darat Laut, Semendo Darat Tengah, Semendo Darat Ulu, Tanjung Agung, Lawang Kidul, and Muara Enim. This study examines changes in the water quality of the Enim River due to domestic wastewater discharges and the presence of the coal mining industry and household industries. Water samples were taken from 4 sampling stations along the Enim River in 2018 and 2023. Data consisted of results of physical, chemical, and microbiological parameters. The status of river water quality was assessed from the pollution index. The results of Enim River surface water quality measurements showed that the parameters of total suspended solids, Dissolved Oxygen, iron (Fe), copper (Cu), oil, and grease concentrations had breached the criteria set for Class II water quality, referring to Government Regulation of the Republic of Indonesia Number 82 of 2001. The results showed that there has been a change in the water quality status of Enim River from 2018 to 2023. The river water pollution index was (1.43-2.47) in 2018 and (1.49-3.85) in 2023 (lightly polluted). Comprehensive water treatment and preventive measures are necessary to manage and mitigate additional pollution in the Enim River.

Study of energy transfer and stress wave propagation during SPT through energy measurement and PIV

The blow counts in standard penetration tests (SPT) require suitable corrections to account for energy losses. Over 4,000 energy measurement data collected from four test sites across Hong Kong have been collected and analysed in this study. On average for all instrumented hammer blows, approximately 62% of the theoretical hammer potential energy is transferred to the drill rod assembly. Using high-speed camera imagery and particle image velocimetry (PIV), the detailed mechanism of stress wave propagation has been visualised and assessed. This has revealed new details and allowed nuances in the results of routine energy measurements to be interpreted in new light. It has been confirmed that the initial compressive wave is reflected as a tensile wave for low end-restraint at the SPT sampler and as a second compressive wave for high end-restraint. The commonly observed discrepancy between the theoretical and measured speeds of wave propagation is highlighted and explored. Energy loss arises from friction during free-fall of the hammer, at the anvil, and from other sources such as the horizontal motion of the hammer-anvil system. The proportion of each major source of energy loss is quantified.

Performance analysis of supply chain for construction materials at high rise building project based on Supply Chain Operations Reference Method: A case study

Abstract Supply chain management is an approach to implementing lean construction efforts to minimize construction project problems, such as cost overruns, project delays, and disputes. Implementation of supply chain management is necessary, especially in the procurement of materials. However, there is a need to measure performance during the implementation. Results of measurement can show the extent to which the project operates and use it as a benchmark to determine the end impact of a project. This study’s purpose is to measure of supply chain performance with the supply chain operation reference (SCOR) method and use the analytical hierarchy process (AHP). Compile data using an observation with scoring form based on standards adoption, categories, and SCOR metrics through key performance indicators (KPI) and structured interviews with the contractor to validate. Limited to the study is the supply chain of ready-mix concrete materials. The AHP method give the weight of the output value of the KPI. The results of the KPI measurements from the contractor’s perspective are that one indicator is still at a low value, which is a cycle time for fulfilling orders. An overall result of 84.83 from the measurement KPI suggests a “good” performance category.

Determination of bolometric albedo based on spectroscopic measurements for selected dust analogues and its impact on the change of cometary brightness during its outburst

The paper presents the results of spectroscopic measurements for selected dust analogues, based on which change in cometary brightness was determined. In the first part of the article, we present the results of laboratory measurements of hemispherical albedo for selected dust analogues using a Cary 5000 spectrometer with an integrating sphere. In the case of this system and the tested samples, the obtained hemispherical albedo values ranged from 0.35 ± 0.07% to 41.58 ± 0.07%. The obtained measurement results were used to determine the bolometric albedo and geometric albedo. For the analogue consisting of charcoal, the Bond albedo was equal to AB(charcoal) = 2.15%, whereas the geometric albedo was equal to pv(charcoal) = 6.76%. The second part of the paper presents an analytical method allowing us to calculate the amplitude of the change of cometary brightness during the outburst. The calculations show that the upper value of the amplitude is 6.5 magnitudes, which is within the medium range amplitude of the outburst. Calculations have shown that as the bolometric albedo increases for a given agglomerate porosity, the temperature decreases, which determines a smaller sublimation flux, which translates into a larger change in the cometary brightness.

Новітні можливості оцінки простої зорово-моторної реакції з використанням сучасних мобільних технологій

Purpose: to investigate the novel possibilities of assessing simple visual-motor reaction using modern mobile technologies. Material and methods. Research methods included analysis and synthesis of scientific-methodical literature, psychophysiological measurements, and mathematical statistical methods utilizing licensed programs RStudio and Numbers. The study was conducted in several stages. In the first stage, 135 students from Kharkiv State Academy of Physical Culture and Kharkiv State Academy of Arts of various specializations, aged 18-23 years, participated: martial arts (n=45); sports games (n=28); sports and artistic gymnastics (n=22); dance, choreography (n=40). The second stage presented the results of measurements from over 200 respondents, of different ages and genders, users of the «Reaction Visual &amp; Acoustical» application on the iOS platform who provided their results in the «Game Center». Results: According to the first stage findings, information regarding the characteristics of the manifestation of simple visual-motor reaction in students of various specializations was obtained. It was noted that the level of sports qualification of athletes influences the reaction manifestation level. The least changes outside the upper and lower quartiles were observed in the martial arts group, where more students had higher sports qualifications. The most significant changes outside the upper and lower quartiles were observed in the sports games group, indicating the presence of athletes of different qualification levels in this group. According to the second stage results, a comparative analysis determined that there were no statistically significant differences (p&gt;0,05) between the measurement indicators of «Game Center» users and the indicators of students of various specializations. Comparing the measurement results in the study groups, it was found that the reaction time of martial artists was statistically lower (p&lt;0,05) than the reaction time of representatives of other specializations and «Game Center» users. Conclusions. Modern computer technologies allow for increased accuracy and speed of obtaining results of various measurements, saving time on result processing, making operational conclusions, and making relevant decisions. The results obtained during the study indicate that the level of sports qualification of athletes influences the reaction manifestation level. Thus, it was determined that martial artists with higher sports qualifications, who passed the appropriate selection stages, have more developed psychophysiological capabilities for the manifestation of various types of reactions. According to the comparative analysis results, it can be argued that there are no statistically significant differences (p&gt;0,05) between the measurement indicators of «Game Center» users and the indicators of students of various specializations.

Региональные аспекты оценки результативности и эффективности риск-ориентированной модели контрольно-надзорной деятельности в сфере обеспечения санитарно-эпидемиологического благополучия населения

This research is relevant since it is important to assess performance and effectiveness of activities performed by Rospotrebnadzor bodies and organizations in RF regions. The aim of this study was to assess performance and effectiveness of control and surveillance activities performed by a territorial office of Rospotrebnadzor given the current reduction in scheduled inspections. Control and surveillance activities performed by the Rospotrebnadzor Rostov Regional Office in 2023 were selected as the research object. They were aimed at improving the quality of the environment for the region population and indirectly at reducing population incidence and mortality associated with exposures to harmful risk factors represented by ambient air, water, and soil pollution etc. The study was accomplished relying on methodical instruments developed by the Federal Scientific Center for Medical and Preventive Health Risk Management Technologies and approved by the RF Chief Sanitary Inspector. The basic methodology establishes rules for calculating economic losses associated with population mortality and incidence (children, working age population and population older than working age) caused by environmental exposures. Calculations were based on the results of instrumental measurements of the environment quality in cities in the Rostov region and the results of scheduled and off-schedule control activities performed by the Rospotrebnadzor Rostov Regional Office in 2023. It was established that control and surveillance activities performed by the Service managed to prevent approximately 1760 deaths and more than 152.4 thousand diseases, which could actually occur should the Service fail to perform its regulatory actions. The total prevented economic losses equaled approximately 2.1 billion rubles in 2023. Economic effectiveness was established relying on prevented losses of the gross regional product and equaled 7.25 rubles per 1 spent ruble in 2023 prices. There are several promising trends in the scientific and methodical support provided by practical activities performed by Rospotrebnadzor. They include development and implementation of methodical approaches to assessing effectiveness of prevention activities; searching for new approaches to assessing performance and effectiveness of other activities accomplished by the Service (licensing, registration of new and hazardous chemicals and products, etc.).

Analysis of the Results of Astroclimate Measurements in the Millimeter Wavelength Range Using Machine Learning Methods

Analysis of the Results of Astroclimate Measurements in the Millimeter Wavelength Range Using Machine Learning Methods