Sharp Temperature Changes Research Articles

T-phPINN: Physics-informed neural networks for solving 2D non-Fourier heat conduction equations

Non-Fourier heat conduction plays a dominant role in many extreme transient heat conduction processes, such as laser pulses and heat transfer in biological systems, but the heat wave effect makes it difficult to solve the temperature field accurately and quickly. In order to solve this problem, the first order time derivative enhanced parallel hard constraints physics-informed neural networks (T-phPINN) is proposed. T-phPINN comprises two subnetworks and incorporates a first order time derivative to capture sharp temperature changes. Two numerical cases show that the minimum relative error of T-phPINN is 0.001 % and 0.015 %, which is 1.04 % and 12.30 % of the error of conventional PINN respectively, proving the accuracy of our architecture. A transfer learning framework is established for scenarios of different parameters, the training only requires 1/6 iterations of the basic model, and close accuracy is obtained. The computational cost of T-phPINN is evaluated using the finite element method as the baseline. For the two cases, the single calculation time is 33.43 % and 51.50 % of the baseline, while the multiple calculation time under the acceleration of transfer learning is 11.59 % and 17.75 % of the baseline. This study will be helpful for solving large-scale non-Fourier heat conduction equations precisely and expeditiously.

ЗЕРНОПРОДУКТИВНОСТЬ И АДАПТАЦИОННЫЙ ПОТЕНЦИАЛ СОРТОВ ЛЮПИНА УЗКОЛИСТНОГО В УСЛОВИЯХ КРАСНОЯРСКОЙ ЛЕСОСТЕПИ

The aim of research is to evaluate the varieties of angustifolia lupine in terms of grain yield and adaptability parameters in the conditions of the Krasnoyarsk forest-steppe. Long-term field experiments were carried out on the experimental field of the Borsky Scientific and Production Complex of the Krasnoyarsk State Agrarian University in 2020–2022. The objects of the study are the varieties of narrow-leaved lupine: Vityaz, Belozerny 110, Belorozovy 144, Bryansky Kormovoy, Nadezhda, Siderat 46, Uzkolistny 53 and the SN 78-07 variety sample. Meteorological conditions during the years of the study varied. The 2020 growing season was warm and moisture-rich, the environmental conditions index (Ij) was 4.7. In 2021, during the main periods of growth and development, with the exception of the 3rd ten-day period of June, there was a significant moisture deficit against the background of air temperatures exceeding the climatic norm, the environmental conditions index was negative (–3.8). In 2022, uneven moisture was observed, sharp temperature changes at the beginning of plant development, the environmental conditions index was negative (–0.9). The average grain yield varied from 11.5 c/ha (variety Nadezhda) to 20.3 c/ha (variety Siderat 46). The contribution of the "vegetation conditions" factor to the formation of the lupine grain yield was 60.8 %, the contribution of the "variety" factor was 31.2 %. The varieties Belozerny 110 (bi = 1.16) and Siderat 46 (bi = 1.39) have high ecological plasticity. The highest ecological stability was noted in the varieties Siderat 46 and Uzkolistny 53, in both genotypes Sd2 = 0.02. The Vityaz variety surpasses other varieties in stress resistance. The highest genetic flexibility was demonstrated by the varieties Siderat 46, Vityaz, Belorozovy 144 and the variety sample SN 78-07. The yield range was 34.4 % (Vityaz) – 50.0 % (Nadezhda). In gene¬ral, according to the adaptive capabilities, the varieties of narrow-leaved lupine were distributed according to a decreasing trend as follows: Siderat 46 > Vityaz > SN 78-7 = Narrow-leaved 53 > Belorozovy 144 > Belozerny 110 > Nadezhda > Bryansky Kormovoy.

Assessing the Volatility of Daily Maximum Temperature across Germany between 1990 and 2022

Climate change causes a global rise in mean air temperature and an increased frequency of temperature extremes. Recent studies link sharp temperature changes between consecutive days to increased mortality, reduced economic growth, and negative effects on ecosystems. This study assesses the variability of the daily maximum air temperature between two consecutive days (i.e., temperature volatility) across Germany from 1990 to 2022. Using observation-based raster data of maximum daily temperature at 0.1° × 0.1° spatial resolution, we assess temperature volatility regarding: (1) magnitude, (2) seasonality, (3) directionality (day-to-day warming vs. cooling), and (4) trends. Further, we analyse land cover changes during the period and examine their correlation to extreme temperature volatility (Tve). The results show that Tve mostly occurred during spring and summer. The magnitude of Tve increased with distance to the coast north-west to south during all seasons and was highest during spring and summer (>10 °C). Overall, Tve was particularly associated with day-to-day cooling (in spring, summer, autumn), while in winter, >60% of days were associated with warming in north and central Germany. Less than 12% of Germany showed significant trends in median Tve associated with warming over the period. Significant trends included increases (>0.26 °C/year) and decreases (−0.09 °C/year) in extreme day-to-day warming during autumn and winter in northeastern Germany. In spring, the majority (>60%) of southern areas showed significant positive trends (up to 0.16 °C/year) in Tve associated with day-to-day cooling. During winter, summer, and autumn, trends in extreme day-to-day cooling were insignificant in over 80% of Germany. Within all land cover types, Tve predominantly varied between 6 °C and 9 °C. Changes in land cover, especially transforming coniferous forests for agricultural purposes, were accompanied by increasing Tve up to 0.49 °C. Understanding rapid temperature changes is crucial for climate change mitigation strategies and limiting the impacts on human health and on the environment.

Modifications to the CLASS Boundary Layer Model for Improved Interaction Between the Mixed Layer and Clouds

AbstractThe impact of clouds on the mixed layer (ML) is critical for understanding the evolution of boundary layer humidity and temperature over the course of a day. We found that accounting for moistening of the cloud layer (CL) by humidity originating in the ML dramatically alters the interaction between the ML and the CL in a one‐dimensional cloud‐topped boundary layer model: Chemistry Land‐surface Atmosphere Soil Slab (CLASS) (Vilà‐Guerau de Arellano et al., 2015, https://doi.org/10.1017/CBO9781316117422). We demonstrate that enabling CLASS to moisten the lower CL improves the prediction of humidity (and the flux of humidity) both above and below the ML top (h). To account for this moistening, we propose a length scale, L, above h, over which mixing of mass fluxes into the environment occurs. The mass fluxes are assumed to decrease linearly from h to a height L meters above h, analogous to a convective plume detraining into the environment at a height‐independent rate. Accounting for this process is accomplished by modifying the differential equations representing the growth of the jumps (sharp changes in humidity and temperature) at h. From analysis of a large number of diurnal Large Eddy simulations (covering approximately 11,000 different early morning initial conditions), we provide a regression model for parameterizing L from early morning weather variables. With the regression‐based estimate of L, the modified model (CLASS‐L) accounts for moistening the lower CL, and as a result, yields improved humidity dynamics, humidity flux profiles, and cloud growth under a broad range of conditions.

Diurnal warming rectification in the tropical Pacific linked to sea surface temperature front

Sharp and rapid changes in the sea surface temperature (SST) associated with fronts and the diurnal cycle can drive changes in the atmospheric boundary-layer stability and circulation. Here we show how a one-dimensional surface ocean model forced with either high-resolution or daily averaged surface fluxes can be used to distinguish diurnal versus frontal SST anomalies observed from an uncrewed surface vehicle. The model, forced with daily satellite fluxes, shows that the diurnal warming is largest within the equatorial Pacific cold tongue of SST. The strong persistent SST front north of the cold tongue is evident in both the oceanic and atmospheric boundary-layer stability scales and, as a consequence, in the magnitude of the diurnal ocean warming. Using SST, barometric pressure and surface wind measurements from moorings at 0°, 95° W and 2° N, 95° W, we show that the front in the SST diurnal warming results in a weakened SST front in the afternoon and a corresponding reduced meridional gradient in the barometric pressure that appears to contribute to a diurnal pulsing of the surface meridional winds. To the extent that these modulate the surface branch of the Hadley cell, these diurnal variations may have remote impacts.

Study of brittle fracture and temperature resistance in the range of 20-11000С of autoclaved cellular reinforced materials

In this paper, the study of cellular autoclaved reinforced material resistant to brittle fracture and temperatures in the range of 20-1100С. The analysis of the results shows that the studied cellular autoclaved reinforced materials by the value of F (brittle fracture criterion) will not brittle fracture under conditions of a sharp change in temperature from 20 to 300 °C because the value of F ≤ 4. It was determined that on the wall system made of blocks of the material in question with a density of 400 kg/m3, 10 days after the completion of masonry under standardized fire exposure for 180 minutes in the temperature range of 20-1100 °C, there was no loss of thermal insulation, bearing capacity and integrity of the samples. During the tests, the maximum temperature values in the middle of the cross-section of the samples did not exceed 97°C. The values of As, Af, Amin for the test time of 182 minutes were 175074, 175212, 168560 Сmin, respectively, which meets the criterion requirements of DSTU B V.1.1-19:2007 and ensures the fire resistance class REI 180.

The effects of the acoustic resonance induced in the atmosphere

After strong earthquakes and volcanic eruptions, geomagnetic oscillations with frequencies of 3.5–4.0 mHz have sometimes been observed. In this paper, we theoretically study the probable cause of these phenomena, which is related to the vertical acoustic resonance arising between the Earth’s surface and the thermosphere due to the propagation of the atmospheric wave corresponding to the acoustic branch generated by surface displacements. In the plane layered model of the atmosphere and ionosphere with inclined geomagnetic field, we analyze the propagation of two-dimensional (2D) harmonic acoustic wave. The height of the reflecting atmospheric layer corresponds to the region of sharp temperature change close to the thermosphere boundary ∼80–90 km. In this case, the calculated fundamental resonant frequency is close to the frequencies of the observed oscillations. The solution of this problem is used to calculate currents and electromagnetic perturbations in the atmosphere and ionosphere. The ionospheric E-layer is considered in the thin layer approximation. In this approximation, the formulas describing the geomagnetic perturbations (GMP) in the ionosphere and on the Earth’s surface are derived. The GMP spectrum contains a sharp maximum at the frequency corresponding to the acoustic resonance. According to the calculations, close to the resonance frequency, the spectral powers of GMPs on the ground can reach 5–30 nT2/Hz, which is consistent with the results of ground-based measurements.

Cultivation of plants based on new technologies in the dry soil of the Aral Sea

The article presents the results of research aimed at growing plants on the basis of different technologies in the relic-swamp salt-sand desert soils of the Aral Sea. The amount of annual precipitation on the soils of this area formed in the conditions of the arid climate region is 180-200 mm. Many factors should be taken into account for growing plants in these areas. It is necessary to choose a suitable halophyte plant for marshy saline soils and to take into consideration sharp changes in temperature throughout the season. Planting in these soils is due to atmospheric precipitation and groundwater. Therefore, experiments were carried out on plant cultivation in the pipe method, and the efficiency was up to 1.5 times higher than in conventional conditions. The combined use of different technologies with the pipeline method has further increased efficiency.

Conchological variation of widely common species of terrestrial mollusks of Uzbekistan

This article presents current research on the variability of widespread common species of terrestrial mollusks of the family Buliminidae of Uzbekistan. The study of features of the population structure of species - indicators of changes in biocenoses under the influence of various factors, including anthropogenic ones, is an important component of environmental monitoring of various territories. These species, in particular, include terrestrial mollusks Pseudonapaeus albiplicatus, Psendonapaeus sogdianus, Pseudonapaeus secalina, Psendonapaeus miser, Chondrulopsina fedtschenkoi. A number of studies have been devoted to the analysis of intrapopulation variability of these species. In the course of these studies, it has been shown that these species are sensitive to successional processes with the morphology of their shell, as well as the frequency ratio of polymorphic characters. In this work, biotopic variability of morphometric characters, conchological variability of the shell, variability of morphometric characters of different habitats of Pseudonapaeus albiplicatus, Psendonapaeus sogdianus, Pseudonapaeus secalina, Psendonapaeus miser, Chondrulopsina fedtschenkoi were studied.Awhich, living in arid conditions, adapt to sharp changes in temperature and humidity, while acquiring a number of additional characteristics, such as: parietal callus, mouth lips and teeth, which play one or another role in reducing the loss of moisture from the body of mollusks.The indicator ability of these species is enhanced by the relative inactivity of individuals and at the same time by the large number of populations and wide distribution throughout Europe. It seems that the study of populations of these mollusks living in various landscapes will provide a clearer picture of the state of the environment, and, in addition, will add to the range of data on microevolutionary processes currently occurring. Goal of the work. Comparison of intrapopulation variability molluscs of the family Buliminidae living on the territory Uzbekistan.

Patrolling the border: Billfish exploit the hypoxic boundary created by the world's largest oxygen minimum zone.

Pelagic predators must contend with low prey densities that are irregularly distributed and dynamic in space and time. Based on satellite imagery and telemetry data, many pelagic predators will concentrate horizontal movements on ephemeral surface fronts-gradients between water masses-because of enhanced local productivity and increased forage fish densities. Vertical fronts (e.g. thermoclines, oxyclines) can be spatially and temporally persistent, and aggregate lower trophic level and diel vertically migrating organisms due to sharp changes in temperature, water density or available oxygen. Thus, vertical fronts represent a stable and potentially energy rich habitat feature for diving pelagic predators but remain little explored in their capacity to enhance foraging opportunities. Here, we use a novel suite of high-resolution biologging data, including in situ derived oxygen saturation and video, to document how two top predators in the pelagic ecosystem exploit the vertical fronts created by the oxygen minimum zone of the eastern tropical Pacific. Prey search behaviour was dependent on dive shape, and significantly increased near the thermocline and hypoxic boundary for blue marlin Makaira nigricans and sailfish Istiophorus platypterus, respectively. Further, we identify a behaviour not yet reported for pelagic predators, whereby the predator repeatedly dives below the thermocline and hypoxic boundary (and by extension, below the prey). We hypothesize this behaviour is used to ambush prey concentrated at the boundaries from below. We describe how habitat fronts created by low oxygen environments can influence pelagic ecosystems, which will become increasingly important to understand in the context of global change and expanding oxygen minimum zones. We anticipate that our findings are shared among many pelagic predators where strong vertical fronts occur, and additional high-resolution tagging is warranted to confirm this.

Interfacial intermetallic compound layer in friction stir welded Mg/Al joints: Relationship between thickness and the welding temperature history

Thickness of the intermetallic compounds (IMC) layer at the interface has a significant effect on the mechanical properties of Mg/Al dissimilar joints. However, the thickness of IMC layer can be only obtained by metallurgical microscopy, which is destructive and has to break down the weld. Therefore, it is crucial to find a reliable approach that can non-destructively predict the thickness of IMC layer in practical application. In the current study, Mg alloy and Al alloy were friction stir butt welded (FSW) under different tool rotation speeds (TRS) to obtain different thicknesses of IMC layers. As the TRS increased from 400 rpm to 1000 rpm, thickness of the IMC layer increased from 0.4 μm to 1.3 μm, the peak welding temperatures increased from 259 °C to 402 °C, and the Z-axis downforces decreased from 10.5 kN to 3.2 kN during welding process. Higher TRS would generally induce higher welding heat input, which promotes the growth of the IMC layer and the softening of base materials. The IMC layer formed through solid-state diffusion and transformation instead of eutectic reaction according to the welding temperature history and interfacial microstructure, and its evolution process was clearly observed by plan view. In order to incorporate the effect of dramatic change of welding temperature which is the characteristic feature of FSW, PsdVoigt function was used to fit the welding temperature histories. A new prediction formula was then established to predict thicknesses of IMC layers with considering sharp welding temperature change. Predicted thicknesses gave good agreement with measured thicknesses obtained experimentally under different welding parameters, which confirmed the accuracy and reliability of the new prediction formula. Based on this prediction formula, the time period of temperature higher than 200 °C during welding was found critical for the thickening of interfacial IMC layers.

Microwave drying method investigation for the process and kinetics of drying characteristics of high-grade rutile TiO2

Titanium dioxide has been extensively applied in aviation, cosmetics, the chemical industry, and coatings. Currently, the primary way to prepare high-grade rutile TiO2 is the chlorination method, which mainly uses ilmenite or titanium slag as raw material through the chlorination process and then reacts it in an oxidation furnace to prepare titanium powders. However, the TiO2 material produced by the liquid-phase method contains a large amount of water, which makes the equipment vulnerable to corrosion in the subsequent process. Meanwhile, the sharp temperature change will lead to the accumulation of water vapor, which may lead to explosion and severe agglomeration, resulting in high research costs and reduced product performance. Therefore, drying equipment with high drying efficiency, high product quality, and low carbon is urgently needed. This paper used microwave drying equipment to assist in drying rutile TiO2 powders. Results indicated that the microwave power, moisture content, and initial mass positively related to the drying rate. The drying process was simulated and analyzed using four common thin-layer kinetic models. A good agreement was that the Modified Page model was in good agreement with the actual drying process of TiO2. The effective diffusion coefficient was calculated. After calculation, the activation energy of microwave-drying TiO2 was 8.22 g/W. This article offers a kinetic theoretical basis and abundant data guidelines for actual products to reinforce the drying of high-grade TiO2 powders.

ON THE DEPENDENCE OF THE TEMPERATURE INTENSITY OF HEAT TRANSFER IN MULTILAYER ENCLOSURE STRUCTURES IN THE CONDITIONS OF NORTHERN KAZAKHSTAN

"The article presents studies on the intensity of the influence of temperature on the heat transfer inside the cement sandwich panel, taking into account the intensity of the influence of temperatures in the ranges of positive and negative values when determining the temperature distribution curve inside Protective construction for climatic conditions in Northern Kazakhstan. Three-layer cement sandwich wall panels, which contain basalt wool and foam polystyrene materials as insulation layer, are considered. The research was carried out using the computer program «Comsol Multiphysics» using the method of finite elements. The study of temperature change kinetics according to the thickness of the structures of two types of cement sandwich panels with the aim of revealing sharp temperature changes affecting the processes of material destruction. It has been shown that the temperature influence during the transmission of the heat flow under both decreasing and increasing temperature conditions flows under softer conditions during the passage of the heat flow through a structure comprising basalt wool as an insulating agent. Keywords: temperature, heat transfer, intensity of action, enclosing structure, insulation. "

Development of test methods for electromechanical sensors of vehicles used for operation in regions with a hot climate

Currently, there are various methods of testing vehicles and its components used by different car manufacturing companies. Also, these methods are given in the UNECE regulatory documents in the field of transport, but these documents do not take into account the separate operating conditions of cars in different regions. In this regard, the paper presents the road and climatic conditions of Central Asia characterized by peculiar characteristics. Based on the climatic features of the operation in a hot region, technical requirements have been developed for electromechanical sensors of cars for operation in hot climatic conditions, which should ensure the reliability of these components when the car runs at least 250,000 km. The method of testing electromechanical sensors of cars has been presented. It is established that in order to ensure the normal operability of sensors operating in hot climates, it is necessary to conduct tests at a nominal ambient temperature 45 ± 5 °C. The test procedure is built based on this parameter. All developed test methods are consistent with current standards in the field of electromagnetic, electromechanical and other electrical parameters of the automotive industry. Schematic diagrams of stands for testing have been given. The paper reflects the methodology of accelerated reliability tests, in which the temperature is set as the accelerating factor. The tests fully reflect the operational characteristics of the movement of cars in a sharply continental climate with a hot slope of ambient temperature with sharp temperature changes. After each test, it is determined that the nominal parameters of the sensors are checked for compliance with the established requirements. Conclusions reflecting the results of the work carried out have been made.

Testing Electromechanical Sensors to Ensure Reliability in Hot Environments

In the world there are various methods of testing vehicles and its components used by various car manufacturing companies. Many methods are given in the UNECE regulatory documents in the field of transport, but these documents do not take into account the hot and climatic conditions of car operation. This article presents the road and climatic conditions of Central Asia, which is characterized by peculiar characteristics. The test methods are designed in such a way that, when operating cars in hot climatic conditions, the reliability of the sensors should be ensured when the car runs at least 250,000 km. It is established that in order to ensure the normal operability of sensors operating in hot climates, it is necessary to conduct tests at a nominal ambient temperature 45±5 °C, based on this parameter, a test procedure is built. The test methods are designed in such a way that all tests are carried out in accordance with the current standards in the field of electromagnetic, electromechanical and other electrical parameters of the automotive industry. Schematic diagrams of test benches are also given. The scientific work substantiates the methodology of accelerated reliability tests, in which the temperature is set as the accelerating factor. The tests fully reflect the operational characteristics of the movement of cars in a sharply continental climate with a hot slope of ambient temperature with sharp temperature changes, i. e. the impact of cyclical temperature changes. Based on the conducted research, conclusions are drawn, which reflects the results obtained.

A Thermal Profile across the Idaho-Montana Fold-Thrust Belt Reveals a Low-Relief Orogenic Wedge That Developed atop a Pre-Orogenic Basement High

Abstract Growing orogenic wedges cool rocks during exhumation of thrust hanging walls and heat them during burial of footwalls, leaving behind a resilient thermal record of earlier deformation in fold-thrust belts. In order to investigate early burial of deformed strata within the retroarc Idaho-Montana fold-thrust belt, we use Raman spectroscopy of carbonaceous material to construct a maximum temperature profile that constrains the thicknesses of eroded rocks structurally above the Lemhi arch, a pre-thrusting basement high. In the eastern portion of the study area, a sharp maximum temperature change of ~120°C occurs across the Johnson thrust, signifying that regional burial and heating predated late-stage faulting. West of here, cumulative exhumation is irregular, varying by up to 5 km over large (~75 km) wavelength folds; however, maximum temperatures in this same region are consistently ~200°C higher than correlative stratigraphic units in the adjacent foreland. The pre-thrusting, low-relief unconformity above the Lemhi arch, which served as the early décollement to the fold-thrust belt, was everywhere buried to at least ~6.5 km depth, which is ~1.5-5.0 km deeper than can be explained by stratigraphic burial. We hypothesize that between ~145 and 80 Ma, a combination of Cretaceous deposition and folding and thrusting at higher structural levels buried the décollement of the Medicine Lodge-McKenzie thrust system to this depth. These results suggest that the early orogenic wedge had exceptionally low taper. We propose that thin strata over the low-relief Lemhi arch limited the availability of potential décollements, which restricted the maximum surface slope that could be constructed in a thin-skinned system. Subsequent growth of the orogenic wedge required activation of a much deeper décollement and a switch to a thick-skinned structural style, promoting a shift from burial to exhumation of the former décollement and the underlying Lemhi arch. This suggests that the growth of an orogenic wedge is dependent on the thicknesses of the preexisting strata and the availability of potential décollements, with sedimentation and burial heating potentially playing a key role.

Theoretical insights into the role of regiochemistry in thermal stability regulation of energetic materials

In this study, the regioisomerism impact on the thermal stability of two pairs of regioisomers with obvious deviation in decomposition temperature has been thoroughly investigated. The initial decomposition mechanism results indicate that the large gaps in decomposition temperature of both pairs are caused by the change of primary initial decomposition paths. Despite with same molecular formula, the regioisomers may decompose through totally different way, and lead to a sharp change in decomposition temperature, hence, making the regioisomerism be capable of improving the thermal stability of energetic materials.

Clinical Features and Principles of Differential Diagnosis of Erysipelas

Purpose. The purpose is to find out the common and different features of the clinical course of erysipelas from other diseases that can imitate it. Materials and methods. 114 case histories of patients who were hospitalized in the center of purulent-septic surgery in the Non-profit municipal enterprise “City Hospital № 3” in Zaporizhzhia for the period 2019-2020 were analyzed. 123 patients, who underwent hospital treatment in the center during this period of time, were with post-injection abscesses of soft tissue, 184 - with soft tissue abscesses, 203 - with phlegmons of various localizations, 49 - with complicated panaritium, 3 of which - subcutaneous. Over the past 5 years, 127 patients were consulted in the clinic and other therapeutic, infectious, neurological and other departments of the city. A number of criteria and signs have been identified to differentiate erysipelas from diseases that may have similar clinical symptoms and a number of circumstances that need to be clarified. Results. It is established that the diagnosis of erysipelas does not require special laboratory examination and is made on the basis of examination of the patient, epidemiological history and medical history. Provoking factors in the development of erysipelas are: violation of the integrity of the skin (abrasions, scratches, abrasions, cracks, bruises, injuries); mycoses; a sharp change in temperature (supercooling, overheating); emotional stress; increased insolation. Erysipelas has a characteristic summer-autumn seasonality. In people engaged in physical labor, the disease is registered more often than in other types of work. Hereditary predisposition to the disease is observed in 10-15% of cases. In this regard, the presence of such factors as congenital and acquired venous insufficiency of the lower extremities, fungal infection of the lower extremities, the presence of postoperative and post-traumatic scars, lymphostasis, diabetes, cardiovascular disease and diseases accompanied by the development of edema, intake of corticosteroids or cytostatics are of essential significance in the development of the disease.
 Conclusions. Mathematical modeling between erysipelas and other diseases that have similar syndromes in their clinical picture may be useful in making a differential diagnosis between them.

Вплив температури зимівлі на стан антиоксидантої системи Apis mellifera L.

The state of the antioxidant system of protection of honey bees Apis mellifera carnica under the action of different temperatures in order to optimize the temperature regime to keep of bee colonies indoors during the winter was studied. Bee colonies of 81–91-day-old worker bees were transferred from the territory of the Yuriy Fedkovych Chernivtsi National University apiary during the period of sharp changes in temperature (the end of November) in constant conditions of the buildings (5±0.6°С and 14±0.8°C) and were kept there for 12 weeks. The selection of worker bees for biochemical analysis was performed 7 times every two weeks. The level of TBA-active products (TBARS), catalase (CAT) and glutathione-S-transferase (GST) activity in insect tagmas (head, thorax and abdomen) were studied. It has been found that the transfer of bee colonies from unstable temperature conditions to stable ones, regardless of their value, leads to a decrease in the flow rate of lipid peroxidation (TBRAS level) against the background of increasing activity of enzymes (CAT та GST). The tagmospecific response of the antioxidant system of honey bees depending on the wintering temperature was revealed. Keeping bee colonies indoors at constant temperatures (for ten weeks) was accompanied by certain coherence in the work of the antioxidant system of insects. In particular, the TBRAS level, as well as the activity of enzymes, did not change significantly during the study. However, in early February (at the end of the experiment), regardless of the building temperature, the TBARS level was increased in the tissues of the bee’s head, and in the tissues of the abdomen the GST activity was intensified. At the same time, in the middle of winter (on January), the level of TBARS in bees, that were kept at +5°С, was lower in comparison with bees that wintered at +14°С. The optimal temperatures for keeping bee colonies in winter indoors was proposed: for bee colonies of medium strength at temperatures around +5°С, and for bee colonies of weak strength around +14°С by the end of January with further temperature decrease to +10°С.

Results of recording sonic waves by seismic stations in the territory of Karelia

In spite of a relatively low seismic activity level, the detailed study of Karelia is not only of theoretical, scientific interest, but is also of practical value which has increased markedly because there are big industrial complexes, gas pipelines and hydrotechnical facilities in the region. The results of recording sonic waves of various nature by stationary and mobile seismic stations are presented. For the observation period 2000—2020 an array of seismic data has been accumulated. In order to correctly understand the nature of the signals under consideration, it should be noted that North Karelia is known to belong to seismic regions, where 5-point earthquakes have taken place earlier. They were distinguished from earthquakes generated by frost cracking by both visual and instrumental data. They are known throughout Fennoscandia. This group comprises both tremors during frost cracking of the soil, primarily with a sharp change in temperature, and frost cracking of ice in inland water bodies. To decide on the nature of ground shaking, it is necessary to pay attention to such signs as the limited area of oscillations and the nature of the wave record. As a result of seismic monitoring of Karelia, the following frost quakes were also recorded: the passage of the bolidi, the take-off of an aircraft, blasting operations during the disposal of ammunition and mining in the immediate vicinity of residential areas and industrial facilities. A wide range of possible sources and examples of sound waveforms are shown. The data obtained indicate the possibility of some shocks with a force of up to 4ѕ5 points in the immediate vicinity of the place of registration, what should be considered in the routine processing of seismic events and seismic hazard assessment in the southeastern Fennoscandian Shield.