bluuebunny/crossref_metadata_2025 huggingface dataset:
Spor Yapan ve Yapmayan Öğretmenlerin Duygu ve Kişilik Özellikleri Arasındaki İlişkinin İncelenmesi
Authors: Güley Arslan Sevcan , Yıldız Mehtap
Published: December 2024

Araştırmanın amacı, öğretmenlerin spor yapma durumlarına göre duygu ve kişilik özellikleri arasındaki ilişkinin incelenmesidir. Araştırmada betimsel araştırma modeli kullanılmış, araştırma örneklemini Ankara ilinde görev yapan 978 öğretmen oluşturmuştur. Araştırma verileri Frenzel ve ark. (2016) tarafından geliştirilen, Alpaslan ve Ulubey (2017) tarafından Türkçe’ye uyarlanan “Öğretmen Duygu Ölçeği” ve Gençöz ve Öncül (2012) tarafından Türk kültürüne uyarlanmış “Temel Kişilik Özellikleri Ölçeği” kullanılmıştır. Verilerin analizinde bağımsız örneklem t testi, tek yönlü varyans analizi (Anova) testi, Tukey post hoc testi, Tamhane’s post hoc testi ve Pearson Korelasyon testi uygulanmıştır.
Araştırma sonucunda, öğretmenlerin kişilik özellikleri ve duygu durumlarından olumlu bir özelliğin artışının diğer olumlu özelliklerin artışına sebep olduğu, olumsuz özelliklerin de azalmasına sebep olduğu belirlenmiştir. Bireylerin olumsuz özellikleri azaldıkça iletişimi güçlü, sosyal ilişkileri gelişmiş, hayattan zevk alan bir yapıya sahip olacakları bunun da mental olarak huzurlu, öz güven düzeyi yüksek bireyler olmalarını sağlayacağı, gelişime açıklık, uyumluluk, dışadönüklük düzeylerinin de olumlu etkilendiği tespit edilmiştir. Kişilik özelliklerinde olumsuz özelliklerin azalmasının ve olumlu özelliklerin artmasının öğretmenlerin ders içerisindeki duygu durumlarını da doğrudan etkilediği saptanmıştır. Spor yapmanın öğretmen duygu düzeylerine ve kişilik özelliklerine olumlu etkisi olduğu saptandığından tüm öğretmenlerin spora teşvik edilmesi için farkındalık seminerleri yapılabilir.
CORRECTION OF EXOGENOUS RISK FACTORS FOR PERIODONTAL LESIONS IN PATIENTS WITH NON-ALCOHOLIC FATTY LIVER DISEASE AND THEIR SPOUSES
Authors: Petrushanko T.O. , Emelyanov D.V.
Published: December 2024

Reduction of periodontal adaptive capacity to the constant action of exogenous factors occurs against the background of non-alcoholic fatty liver disease. Correction of such factors creates favorable conditions for the treatment and prevention of comorbid pathology. The study involved 44 married couples and 25 somatically healthy patients who were clinically examined by a dentist and a gastroenterologist, and questioned about their eating habits and oral care. It was determined that the most common habit among the subjects was the abuse of simple carbohydrates. In 88.6% of patients in the main group, inflammatory periodontal disease was diagnosed, the most common clinical form in 61.3% of patients was chronic generalized periodontitis of the second degree of severity, while in the observation group such pathology was detected in 43.1% of patients (13.6% had chronic catarrhal gingivitis, 20.4% had chronic generalized periodontitis of the first degree). After 12 months of implementation of treatment and prevention measures, there was a significant decrease in the presence of various combinations of habits in patients of both groups with positive dynamics of inflammatory diseases of periodontal tissues.
THE LEVEL OF IMMUNOGLOBULINS IN THE ORAL FLUID OF PATIENTS WITH SECRETORY IMMUNOGLOBULIN A DEFICIENCY AND GENERALIZED PERIODONTITIS
Authors: Sylenko H.M. , Skrypnikov P.M. , Sylenko Yu.I. , Izmailova O.V. , Sylenko B.Yu.
Published: December 2024

One of the major challenges in dentistry is generalized periodontitis (GP). Periodontitis is characterized by the destruction of connective tissue, loss of periodontal attachment, and resorption of alveolar bone. Tissue destruction in periodontal diseases occurs as a result of the action of pathogenic microflora and the interaction of the immune and inflammatory response. The immune system is activated to protect against local microbial attack and the products of their destruction as a result of the spread or penetration into the gingival tissues.
Materials and methods. We examined 85 patients who visited the dental clinic with generalized periodontitis and, based on clinical manifestations of secondary immunodeficiency, conducted a study of the state of their humoral immunity of the oral cavity. During the study, two research groups were established: the control group (group I), which consisted of 10 individuals with clinically healthy periodontal tissues, and the main group (group II). The main group was further divided into two subgroups: subgroup 1 included patients with stage II-III GP and normal levels of sIgA (10 individuals), while subgroup 2 comprised patients with stage IIIII GP and sIgA deficiency in oral fluid (15 individuals). The levels of sIgA, IgG, and IgM in oral fluid were measured using an immunoenzymatic method.
Results. The level of sIgA in the oral fluid of patients in the second subgroup was reduced 58.0 87.83 μg/ml, the concentration of this immunoglobulin in the first subgroup was 173.43-258.82 μg/ml, in the control group this indicator was 192.6-278.18 μg/ml. Detecting a deficiency of secretory immunoglobulin A (sIgA) in the oral fluid of patients with GP enables the appropriate adjustment of treatment regimens. All patients with AP received comprehensive treatment. The treatment of the second subgroup was supplemented with a complex periodontal dressing, which included an immunomodulatory drug, a solution of sodium deoxyribonucleate 0.25%, ascorbic acid, rutin, calendula ointment, etc. It was prescribed in the form of periodontal dressings on the gums for 2-3 hours 5 days.
In patients with GP, there is a significant decrease in sIgA levels, along with an increase in IgG and IgM levels, compared to individuals in the control group and subgroup 1. Implementing the proposed treatment regimen to correct humoral protection deficiencies results in a significant increase in sIgA levels in the oral fluid, along with the normalization of IgG and IgM levels.
Conclusions. The implementation of targeted immunocorrection enhances the clinical effectiveness of chronic GP treatment, as evidenced by long-term results demonstrating stable remission in patients.
MODERN DENTAL ALLOYS: STATUS OF THE ISSUE
Authors: Kindii V.D.
Published: December 2024

Modern dentistry offers a wide range of materials for restoration of lost teeth and aesthetic restoration. Dental alloys occupy a special place among them. Their properties directly affect the durability, aesthetics and biocompatibility of dental structures.
An analysis of modern available domestic and foreign sources of literature concerning dental alloys, their properties and areas of application was carried out.
Results. A selection of 33 scientific articles was formed as a result of the conducted search and selection of scientific works that most closely corresponded to the set goal of the research. It has been established that the choice of the optimal dental alloy for each specific case should be made by a dentist taking into account all the individual characteristics of the patient. Dental alloys play an important role in modern orthopedic dentistry. The constant development of technologies and materials allows to create more and more perfect dental structures that provide high functionality, aesthetics and durability.
The constant development of dentistry is aimed at creating new materials that will be not only strong and durable, but also absolutely safe for the patient's health. Nickel-free alloys and bioactive materials are among the most promising directions in this field.
Nickel-free alloys are a modern solution for dentistry that allows you to ensure high quality treatment and minimize the risk of complications. The constant development of technologies and materials allows to create more and more perfect dental designs that meet the highest requirements of patients.
Conclusions. The analysis of available sources of literature on the issue of dental alloys allows to systematize the available modern developments, conduct their detailed analysis and make the obtained data available to practicing orthopedist dentists.
The perspective of research consists in a detailed study of the latest trends in the development of modern dental alloys for various orthopedic structures.
RECONSTRUCTION OF THE ALVEOLAR RIDGE IN PERIODONTAL TISSUE PATHOLOGY UNDER COMPLEX ANATOMICAL CONDITIONS (CLINICAL CASE).
Authors: Kіnash Yu.O. , Kіnash L.V.
Published: December 2024

The optimal placement of dental implants in the jawbone tissue in cases of periodontal disease ensures conditions for the long-term success of osteointegration and the functioning of the prosthetic construction. However, the anatomical features of the mandible and maxilla often prevent dental implant surgeons from achieving the desired results after the placement of dental implants in cases of horizontal atrophy of the alveolar bone tissue [3,5-7].
Objective. To improve the treatment of patients with periodontal tissue pathology and horizontal alveolar ridge atrophy using an alveolar ridge split technique and to share our experience of applying this technique without bone augmentation.
Materials and Methods. Preliminary examination was conducted using generally accepted subjective and objective examination methods. Targeted X-rays and computed tomography with 3D reconstruction were performed using the Morita Veraviewepas 3D Model X-550 (Japan).
A 40-year-old female patient Z. presented to the Department of Therapeutic Stomatology, Periodontology, and FPGE Stomatology, complaining of the absence of tooth 24 and the damaged crown of tooth 25.
Results and Discussion. In our study, we decided to apply our developed technique of gradual alveolar ridge split using a piezoelectric periotome in the affected area without using bone substitutes. We named this technique "stepwise splitting," using several sizes of spreader chisels (from larger to smaller sizes). The phosphorus-to-calcium ratio in the bone tissue preserves not only strength but also flexibility and elasticity, allowing the bone to act as a shock absorber while stretching the alveolar ridge transversely almost twice its size. This approach reduces stress loading during the osteointegration of dental implants under complex conditions.
Conclusion. Modern research on the effectiveness and safety of dental implants under complex anatomical conditions associated with periodontal tissue pathology is impossible without the practical skills and experience of the dentist along with auxiliary diagnostic technologies. Therefore, new approaches have been introduced into clinical practice for the treatment of horizontal alveolar ridge atrophy of the mandible and maxilla using "stepwise" alveolar ridge splitting.
INFLUENCE OF METHODS OF AUGMENTATION OF THE ALVEOLAR PROCESS DURING TOOTH EXTRACTION OPERATION ON THE STABILITY OF DENTAL IMPLANTS
Authors: Kolisnychenko M.O. , Lokes K.P.
Published: December 2024

The issues of functional and aesthetic optimum are extremely important in the field of providing dental care to the population nowadays. Different materials are used to solve the issue of bone atrophy after tooth extraction: bone substitutes (autografts, allografts, xenografts or alloplastic materials), resorbable and nonresorbable membranes, etc.
The aim of the study was to determine the influence of the type of healing of the alveola of the removed mandibular molar on the effectiveness of dental implantation.
Materials and methods. The study enrolled 75 patients aged 25 to 45 years who were indicated for removal of a single mandibular molar with subsequent planning of dental implantation.
The results. Patients were enrolled into three clinical groups depending on the method of alveolar process augmentation. Before the surgical stage of dental implantation, which corresponded to the 90th day after the tooth extraction operation, the lowest indicator of the optical density of bone tissue was noted in patients of the control group, where the healing of the socket of the removed tooth took place traditionally under a blood clot. In the first and second clinical groups, on the 90th day after the installation of the implant, a higher optical density of bone tissue in the area of the installed dental implant, compared to the control group, continued to be observed by 20.3% and 57.0%, respectively.
Conclusion. The combined use of granules of bone substitute of animal origin and keratoxenoimplant after the operation of removal of the mandibular molar leads to the optimal formation of newly formed bone tissue in the area of the socket of the removed tooth, which contributes to the processes of osseointegration of the intraosseous dental implant.
VİYOLA EĞİTİMİNDE KULLANILAN AYFER TANRIVERDİ “VİYOLA II” KİTABINDAKİ ETÜTLERİN TEKNİKSEL AÇIDAN İNCELENMESİ
Authors: Yazıcı Derya
Published: December 2024

Bu araştırma, Ayfer Tanrıverdi “Viyola II” metodunda bulunan I., II. ve I-II. pozisyon geçişli etütlerin sol ve sağ el tekniklerinin viyola eğitimi bakımından incelenmesine yöneliktir. Yapılan inceleme ile tespit edilen sol ve sağ el teknikleri hakkında öğrenci ve öğretmenlere bakış açısı kazandırmak hedeflenmiştir. Araştırma verilerinin toplanmasında belgesel tarama tekniği kullanılmıştır. Verilerin analizi için metottaki pozisyon geçişli etütler incelenmiş, her etüt bestecisi, hızı belirtilerek, sol ve sağ el teknikleri tespit edilmiş, tablolaştırılmış ve sunulmuştur. Araştırma sonucunda metotta yer alan 78 etütte sol el teknikleri açısından entenasyon, modülasyon, parmak tutma, parmak hazırlama, çift ses basma, 3 ve 4 sesli akor sesleri basma, dizi ve arpej seslerini basma tekniklerinin kullanıldığı; Metottaki sağ el teknikleri incelendiğinde orta yayda detaşe, bütün yayda detaşe ve legato, bağlı ve bağsız staccato, kol dengesi çalıştırma amacı ile tel atlama çalışmaları, iki teli aynı anda çalma, 3 sesli ve 4 sesli akoru bölerek çalma, nüans ve aksan çalma tekniklerinin kullanıldığı sonucuna ulaşılmıştır.
Instability of solid-body rotation of heton type
Authors: Kalashnik M. V.
Published: December 2024

It is traditionally believed that in a liquid of uniform density, an axisymmetric barotropic flow with solid-body rotation is stable. Within the framework of a two-level quasi-geostrophic model, this work shows that this is not in the case of a baroclinic flow with solid-body rotation of the heton type. Such a flow has different directions of rotation at two levels. Due to the vertical velocity shift, this flow is always unstable. The paper develops a linear theory of the instability of such flows both in a model without friction and in a model with Ekman friction. It is shown that for instability in a model with friction, the horizontal wave number of the disturbance should not exceed a certain critical value. It has been established that instability with respect to long-wave disturbances in the model without friction is absolute in nature, i.e. always exists. The development of instability may be associated with the formation of observed disturbances in the axial zone of intense atmospheric vortices.
A hysteretic response of the global carbon cycle to anthropogenic СО2 emissions into the atmosphere
Authors: Eliseev A. V. , Gizatullin R. D.
Published: December 2024

Idealized numerical experiments were performed with the Earth system model developed at the A. M. Obukhov Institute of Atmospheric Physics of the Russian Academy of Sciences (IAP RAS ESM) under anthropogenic CO2 emissions into the atmosphere, which increase initially and decrease afterwards. These numerical experiments revealed the inertia of various components of the Earth system, leading to a delay in the response of various components of the carbon cycle relative to the anthropogenic emissions by several decades. The inertia of the carbon cycle components leads to a hysteresis response of its characteristics to non-monotonic in time anthropogenic CO2 emissions into the atmosphere, noticeable, in particular, for the gross primary production and respiration of plants and soil. In turn, the hysteretic response of the characteristics of the global carbon cycle indicates the irreversibility of its changes on the scale of (at least) several decades. The latter should be taken into account when planning adaptation and/or mitigation of climate change.
Study of wind and wave parameters at the Gorky reservoir: field measurements and numerical simulation
Authors: Kuznetsova A. M. , Baydakov G. A. , Troitskaya Yu. I.
Published: December 2024

The paper provides an overview of a series of articles aimed at creating a regional model based on the WAVEWATCH III spectral wave model adapted to the conditions of an inland water body using the WRF atmospheric model. Adaptation and verification of the models was carried out on the basis of the results of a series of field experiments to study the wind-wave regime of the Gorky reservoir performed in 2012–2019 using an autonomous buoy station based on the Froude oceanographic buoy. Within the framework of the WAVEWATCH III model, an analysis was made of the influence on the simulation result and subsequent adjustment of the parameters of the WAM 3 wind input parameterization, as well as the scheme for the approximate calculation of the Boltzmann integral Discrete Interaction Approximation (DIA). Within the framework of the WRF model, calculations were carried out using various parameterizations of the planetary boundary layer and the near-surface layer of the atmosphere, and the advantage of using the Large Eddy Simulation method was shown. In addition to the review, the paper presents preliminary results of coupling the wave and atmospheric models, which makes it possible to adjust the interchange of parameters between the models at each time step.
Peculiarities of radio pulsars with long periods
Authors: Malov I. F.
Published: December 2024

The analysis of parameters of radio pulsars with periods P 5 sec has been carried out. It was found that there is not a clear dependence dP / dt on P on the diagram {dP / dt, P}. Such lack of any dependence can be explained in the frame of the disk model. It is shown that the pulse width decreases with increasing period for the sample considered. It is the opposite of the dependence in the generally accepted pulsar model. Such a behavior can be explained by the dependence of the level of radiation on the period, The alternative explanation is a non-dipole structure of magnetic field in the region of the generation of observed radiation. We consider the possibility of the description of extremely long intervals between successive pulses in pulsars J0901–4046 and J0250+5854 using the model of drift waves at the periphery of the magnetosphere. In the drift model rotation periods of these pulsars are several times shorter than the intervals between observed pulses.
Rotation of the Milky Way halo in the solar neighborhood based on GAIA DR3 catalog
Authors: Tkachenko R. V. , Bryndina A. P. , Zhmailova A. В. , Korchagin V. I.
Published: December 2024

The rotation of the Milky Way halo in the solar neighborhood is investigated using kinematic data from the GAIA DR3 catalog for RR Lyrae variable stars with parallax errors of less than 20%. Two criteria were used for selecting halo stars — kinematic and spatial. In both approaches, we confirm the existence of weak rotation of the halo in the direction opposite to the rotation of the Galactic disk with velocities of 4.08 ± 2.19 km/s for the kinematic criterion and 9.49 ± 2.59 km/s for the spatial criterion.
Equilibrium figures of two liquid masses with synchronous rotation. Dynamics of a double asteroid (190166) 2005 UP156
Authors: Kondratyev B. P.
Published: December 2024

The problem of equilibrium figures of two liquid masses in a state of tidal mutual capture is posed and solved. The condition of complete synchronous (orbital plus spin) rotation is satisfied in the system, both bodies have the same masses and congruent ellipsoidal surfaces. For each figure, in addition to its own gravity and centrifugal forces, the attraction from the second body is taken into account in the tidal approximation. The spatial form of equilibrium figures in the form of triaxial ellipsoids is found by an analytical and numerical method. It is established that the spin rotation of ellipsoidal equilibrium figures occurs not around small axes, as is usually assumed, but around the middle axes of the ellipsoids. This method is used to study the binary asteroid (190166) 2005 UP156, which approximately satisfies the initial conditions of the problem. The study showed that with the parameters known today, the system of two asteroids (190166) 2005 UP156 is nonequilibrium.
Secular evolution and stability of rings around rotationally asymmetrical bodies. Revisiting the problem
Authors: Kondratyev B. P. , Kornoukhov V. S.
Published: December 2024

A method has been developed for studying the secular evolution and stabilization of the shape of rings in small celestial bodies that do not have shepherd satellites. A model of a compound ring consisting of two close, generally non-coplanar elliptical Gaussian rings has been constructed. The self-gravitation of the ring is taken into account through the mutual gravitational energy of the boundary rings. The function is presented as a series with an accuracy of up to the 4th power of small eccentricities and mutual inclination of the rings. The secular evolution of a compound ring is described by differential equations in special (collective) variables. For rings without a central body (problem 1), a closed system of 8 differential equations is obtained using the mutual energy function. The evolution of rings in the azimuthally averaged potential of a rotating triaxial body is also studied (problem 2); a second system of eight differential equations is derived for it. In both problems, in addition to the general case, two particular ones are considered: i) the case of coplanar elliptical rings, and ii) the case of circular rings with a tilt. The theory is applied to study the recently discovered ring of the dwarf planet Haumea. It is shown that without taking into account self-gravity, the nodal precession time of the Haumea ring is equal to but taking into account the self-gravity of the ring can reduce this period. It is established that self-gravity does indeed contribute to the preservation of the ring shape without invoking the hypothesis of shepherd satellites. Criteria for the preservation of the ring shape are obtained, which made it possible to estimate the interval for the ratio of the ring mass to the mass of Haumea. Taking into account the optical thickness of the ring, it is shown that the Haumea ring with a mass can consist of ice particles of size d0≈0.7÷1m.
Tashanta as a promising astropoint of the Altai mountains: the first results of the astroclimate study
Authors: Bolbasova L. А. , Kopylov E. A. , Potanin S. А.
Published: December 2024

For the Tashanta point, 49°43ʹ4ʺN, 89°11ʹ31ʺE, Gorny Altai, data from continuous measurements of astroclimatic parameters of the surface layer, monthly average values of the total cloud cover, suspended water vapor from the ERA5 atmospheric reanalysis database and primary measurements of the altitude distribution of turbulence are presented. The results show unique astroclimatic and operational conditions, which probably make it one of the best places in the Russian Federation for submillimeter and optical range observatories.
Fundamental plane distances and peculiar velicities of 140 groups and clusters of galaxies at low redshifts: the Hubble diagram
Authors: Kopylova F. G. , Kopylov A. I.
Published: December 2024

We used the fundamental plane (FP) of early-type galaxies (data from the Sloan Digital Sky Survey) to measure the relative distances and peculiar velocities of 140 groups and clusters of galaxies at low redshifts ( z0.12). We have constructed the Hubble diagram between the distances of galaxy groups/clusters and their radial velocities in the CMB reference frame in the flat ΛCDM model ( Ωm=0.3, H0=70km · s –1 Mpc –1 ).
We found that the standard logarithmic scatter of groups and clusters of galaxies on the Hubble diagram (minus peculiar velocities) is ± 0.0173 ( N = 140), which corresponds to the deviation of the Hubble constant 70 ± 2.8 km · s –1 Mpc –1 . For a sample of galaxy systems ( N = 63) with X-ray luminosity in the interval 0.151÷4×1044erg/s we got 70 ± 2.1 km · s –1 Mpc –1 . The standard deviations of peculiar velocities with quadratic allowance for errors are equal to null714 ± 7 km/s and 600 ± 7 km/s, respectively.
Five large superclusters of galaxies from the SDSS region show an average peculiar velocity relative to the CMB reference frame +240 ± 250 km/s. We did not detect the outflow of galactic systems from the void (Giant Void, α≈13h, δ≈40°, z≈0.107) formed by groups and clusters of galaxies.
A survey of high mass star forming regions in the line of singly deuterated ammonia NH2D
Authors: Trofimova E. A. , Zinchenko I. I. , Zemlyanukha P. M. , Thomasson M.
Published: December 2024

Present survey is a continuation of our research of high mass star forming regions in the lines of deuterated molecules, the first results of which were published in [1]. This paper presents the results of observations of 50 objects in the line of ortho modification of singly deuterated ammonia NH 2 D 111s-101aat frequency 85.9 GHz, carried out with the 20-m radio telescope of the Onsala Space Observatory (Sweden). This line is detected in 29 sources. The analysis of obtained data, as well as the fact that gas density in the investigated sources, according to independent estimates, is significantly lower than the critical density for this NH 2 D transition, indicate non-LTE excitation of NH 2 D. Based on non-LTE modeling estimates of the relative content of the NH 2 D molecule and the degree of deuterium enrichment were obtained, and the dependencies of these parameters on temperature and velocity dispersion were analyzed with and without taking into account detection limits assuming the same gas density in all sources. An anticorrelation between the NH 2 D relative abundances and the kinetic temperature is revealed in the temperature range 15–50 K. At the same time, significant decrease in the ratio of the NH 2 D/NH 3 abundances with increasing temperature, predicted by the available chemical models, is not observed under the adopted assumptions. An anti-correlation was also revealed between the relative content of the main isotopologue of ammonia NH 3 and the velocity dispersion, while no statistically significant correlation with the kinetic temperature of sources in the same temperature range was found.
Determining the structure of the atmosphere exoplanet HD 189733 b based on multicolor photometric transit observations
Authors: Bekesov E. V.
Published: December 2024

The work carried out an analysis and interpretation of light curves obtained with observing with the HST telescope the transit of the exoplanet HD 189733 b across the disk of the star. Observations were carried out in a wide range of wavelengths 5500–10500 Å, which made it possible to identify the relationship between the wavelength and the data obtained during the interpretation of the radius of the planet. It has also been shown that this dependence can be explained by the presence of a Rayleigh atmosphere on the planet, and an approximate assessment of the possible parameters of this atmosphere was also carried out.
Aeronomy of the atmosphere of ultra-hot Jupiter Kelt9B taking into account the kinetics of hydrogen atom levels
Authors: Shaikhislamov I. F. , Miroshnichenko I. B. , Rumenskikh M. S. , Shepelin A. V. , Berezutsky A. G. , Sharipov S. S. , Golubovsky M. P. , Chibranov A. A. , Khodachenko M. L.
Published: December 2024

Ultra-hot Jupiter Kelt9b impels to reconsider existing models of the upper atmospheres of hot exoplanets, which were previously developed using the example of G or M star systems such as HD209458b and GJ436b. The unique conditions of interaction between the radiation of an A-class star and the atmosphere necessitate kinetic modeling of excited levels of elements, primarily the hydrogen atom. For Kelt9b, the absorption was measures for several Balmer lines and lines of a number of heavy elements, the quantitative interpretation of which is an urgent task. In this work, for the first time, 3D modeling of the atmosphere of a planet with a close location of the Roche lobe has been implemented, taking into account the aeronomy and kinetics of excited hydrogen.
Variations in the radiation intensity of the pulsar B0950+08: 9 years of monitoring at a frequency of 110 MHz
Authors: Smirnova T. V. , Toropov M. O. , Tyul'bashev S. A.
Published: December 2024

The analysis of variations in the radiation intensity of the pulsar B0950+08 from 2014 to 2022 with scales from minutes to years was carried out. The observations were obtained in a round-the-clock daily survey conducted on the Large Phased Array (LPA) radio telescope. The high variability of radiation is shown not only from pulse to pulse, but also at scales greater than 3 min. The average value of the estimated amplitude of these variations in 3.2 minutes is 25 Jy, the modulation index is 1. The average relative amplitude of the interpulse (IP) is 2.00 ± 0.28 % of the main pulse. In individual pulses, the amplitude of the interpulse may exceed the amplitude of the main pulse (MP), but this is a rare event. Radiation is observed in almost the entire period of the pulsar. For the first time, the relative amplitude of radiation between the main pulse and the interpulse (radiation bridge) was measured. When averaging about 10 hours, it varies from 0.8% to 1.31% with an average value of 1.04 ± 0.28 %. A high correlation was found between MP and IP amplitude variations both when averaging profiles over 3.2 minutes and when averaging over years. This correlation is due to refractive interstellar scintillation. The frequency scale of IP diffraction interstellar scintillation was measured for the first time and it was shown that the spectral forms for IP and MP are well correlated and have the same frequency scale. There are strong variations in the frequency scale of scintillation f dif from session to session (time interval from one day) on scales of 200–800 kHz. The refractive scale of scintillation for 1–2 days has been determined. A modulation of radiation with a characteristic scale of about 130 days was detected, which, apparently, is also associated with refractive scintillation.
Non-thermal processes of nitrogen oxide formation during precipitation of auroral electrons into the upper atmospheres of terrestrial planets
Authors: Shematovich V. I. , Bisikalo D. V. , Tsurikov G. N. , Zhilkin A. G.
Published: December 2024

Nitric oxide is a potential biomarker in the N 2 -O 2 atmospheres of terrestrial exoplanets, which can be detected by space missions, including the planned launch of the Russian Spektr-UF observatory. From observations of the Earth's thermosphere in the polar regions, it is known that important sources of formation of this molecule are the precipitation of high-energy electrons into the planet's atmosphere, as well as the non-thermal processes accompanying them. In this paper the non-thermal processes of nitrogen oxide formation in the polar regions of the Earth's upper atmosphere are investigated, as well as the atmospheres of exoplanets located in the potential habitability zone of active stars. For this purpose, a numerical kinetic Monte Carlo model of the interaction of high-energy electrons with atmospheric gas has been developed; a kinetic Monte Carlo model of the interaction of suprathermal N( 4 S) atoms formed as a result of dissociation of N 2 molecules by electron impact with the surrounding gas; as well as a model of odd nitrogen chemistry with taking into account the molecular and turbulent diffusion. According to the results of calculations, it is confirmed that the process of dissociation of N 2 by an electron impact during the interaction of the stellar wind with the atmosphere of the planet is an important source of suprathermal N atoms, which contribute to a significant increase in the non-thermal formation of NO in the N 2 -O 2 atmospheres of terrestrial planets (both locally, in the case of a planet's own magnetic field, and throughout the planet's surface, in the case of its absence). Because the column concentration of NO during flares becomes larger, therefore the chances of detecting of nitric oxide biomarker in the atmospheres of the terrestrial-type exoplanets located in the potential habitability zone of active stars are also become larger.
Synthesis OF Bi1.5CoSb1.5O7 pyrochlore under hydrothermal conditions and its catalytic properties in the CO oxidation
Authors: Egorysheva A. V. , Golodukhina S. V. , Liberman E. Yu. , Razvorotneva L. S. , Kirdyankin D. I. , Popova E. F.
Published: December 2024

The pyrochlore solid solution region in the Bi2O3–CoO–Sb2O5 system is determined. A previously unknown ternary oxide Bi3Co2/3Sb7/3O11 with cubic KSbO3 structure (sp. gr. Pn-3, a = 9.5801(1) Å, wR =0.0132) is found. An isothermal section of the system is constructed in the region of CoO-Bi3SbO7-CoSb2O6-BiSbO4 at 650°C. It is shown that cobalt state in pyrochlore crystal lattice is Co2+. For pyrochlore composition Bi1.5CoSb1.5O7, the synthetic methods under hydrothermal conditions of both without microwave-assisted treatment and with it have been developed. Based on the data of X-ray diffraction analysis, local energy-dispersive X-ray analysis, scanning microscopy and IR spectroscopy, a mechanism for the pyrochlore phase formation under hydrothermal condition is proposed. The dispersed Bi1.5CoSb1.5O7 samples (SCD = 30 nm) are synthesized and the prospects of their use as catalysts for CO oxidation are shown.
Synthesis of ferromagnetic alloys of the InSb–Ni2–yMnSb system (y = 0; 1)
Authors: Pashkova O. N. , Oveshnikov L. N. , Ril A. I. , Dmitryakov P. V. , Sanygin V. P.
Published: December 2024

Composite alloys of the InSb–Ni2–yMnSb system (y = 0, 1) have been synthesized. According to X-ray diffraction data, all samples contained a ferromagnetic phase based on the NiMnSb compound in the form of nano-sized inclusions and agglomerates with characteristic sizes of 50-90 nm and Curie temperature Tc = 727–732 K. Absence of the Ni2MnSb phase in the sample (InSb)100–x (Ni2MnSb)x (x = 5) indicates its instability when alloyed with InSb.
New lithium tungstophosphate complex. synthesis, crystal structure. Catalytic properties of a tetranuclear cobalt complex with tungstenphosphate ligands and lithium countercation in the reaction of photochemical water oxidation in artificial photosynthesis
Authors: Dzhabieva Z. M. , Shilov G. V. , Avdeeva L. V. , Savinykh T. A. , Dzhabiev T. S.
Published: December 2024

Polyoxotungstophosphate complex Li7[γ-PW10O36] · 7H2O was synthesized. Structure was studied by the X-ray method. Rhombic crystals, space group P21212, a = 12.401(3) b = 18.948(4), c = 9.636(2) Å, V = 2265 Å3, Z = 2 (the heteropolyanion sits on a crystallographic twofold axis), λ = 0.71069 Å. The complex is thermostable. The interaction of Li7W10PO36 with Co(NO3)2 forms a tetranuclear complex Co(II) Li7[Co4(H2O)2(γ-PW10O36)2] · 36H2O – an effective catalyst for the water oxidation to O2. The number of turns of the catalyst is TON = 330, the quantum yield of photogenerated oxygen is ФO₂ = 0.46.
Synthesis, structure and magnetic properties of Mn-substituted magnetite for magnetorheological materials
Authors: Haiduk Yu. S. , Korobko E. V. , Radkevich L. V. , Golodok R. P. , Usenko A. E. , Pankov V. V.
Published: December 2024

Iron(II)-manganese(II) ferrite with the composition Mn0.3Fe2.7O4 was synthesized using the coprecipitation method (with various options for subsequent thermal and mechanical treatment of the precipitate). The material was studied by X-ray phase analysis, infrared spectroscopy, scanning electron microscopy and magnetometry. The powder, which was fired in argon at 740°C (8.0 h) and high-energy grinding (1.0 h) at the final stage of synthesis, is a promising functional filler for magnetorheological materials. An oil suspension based on this powder shows a high shear stress value (3500 Pa at 625 mT). In addition, this powder has a high oil absorption capacity, which ensures sedimentation stability of the suspension.
Influence of synthesis method on morphology and functional properties of li-rich layered oxides
Authors: Medvedeva A. A. , Makhonina E. V. , Klimenko M. M. , Politov Y. A. , Rumyantsev A. M. , Koshtyal Y. M. , Goloveshkin A. S. , Kurlykin A. A.
Published: December 2024

The influence of the precursor synthesis method on the functional properties of cathode material based on lithium-rich oxides was studied. Precursors were obtained by co-precipitation method (hydroxide and carbonate precursors) and solvothermal method (hydroxide and oxalate precursors). Within the selected synthesis methods, the parameters were changed by varying the precipitant and pH of precipitation during the synthesis by co-precipitation method and the reaction medium/precipitant combinations during the solvothermal synthesis method. The solid-phase reaction of the investigated precursors with lithium source and subsequent high-temperature annealing resulted in lithium-rich layered oxides of the composition Li1.2Ni0.133Mn0.534Co0.133O2. The sample synthesized by solvothermal method exhibits high discharge capacity values of 233.2 mAh/g (0.1 C) and 175.3 mAh/g (0.5 C) with residual discharge capacity of 94 and 80.5%, respectively. The samples with comparable electrochemical performance are similar in morphology. These materials are agglomerated and characterized by a bimodal distribution with maxima in the 14–19 μm and 55–60 μm regions. An approach that takes into account the relationship between morphology and electrochemical properties will allow the preparation of higher performance electrode materials for lithium-ion battery.
Polymeric iodobismuthates Cat{[BiI4]} with pyridinium-derived cations: structure and properties
Authors: Shentseva I. A. , Usoltsev A. U. , Korobeynikov N. A. , Korolkov I. V. , Sokolov M. N. , Adonin S. A.
Published: December 2024

Two novel bismuth(III) iodide complexes – (1,3,4-MePy){[BiI4]} (1) и (3-Br-1-MePy){[BiI4]} (2)) – were synthesized by the reaction of iodides of corresponding cations with BiI3 in organic solvents. Crystal structure of the compounds was determined by X-ray diffraction; For both complexes, the thermal stability was studied, and the optical band gap values were experimentally estimated.
Three-dimensional metal-organic coordination polymers of Zn(II) based on 1,2-бис(4-pyridyl)ethylene and anions of iodoterephthalic and iodizophthalic acids
Authors: Zaguzin A. S. , Bondarenko M. A. , Korobeynikov N. A. , Usoltsev A. N. , Fedin V. P. , Adonin S. A.
Published: December 2024

[Zn2(2-I-bdc)2bpen]n (1) and [Zn(I-ipa)bpen]n (2) are two new metal-organic frameworks based on zinc, 2-iodoterephthalate (2-I-bdc), 5-iodisophthalate (5-I-ipa), and 1,2-bis(4-pyridyl)ethylene (bpen). Using single-crystal X-ray diffraction, crystal structures of 1 and 2 were determined.
Synthesis and thermal transformations of tungstenphosphatemetallate complexes with hexamethylenetetramine
Authors: Lozinskii N. S. , Lopanov A. N. , Moroz Ya. A. , Pekhtereva T. M.
Published: December 2024

The results of the synthesis and identification of complex compounds of hexamethylenetetramine (CH2)6N4 (HMTA) with tungstenphosphatemetallates are presented. The processes and crystalline products of thermal decomposition of compounds with the general formula: Cat5[PW11O39Z(HMTA)] ∙ nH2O, Cat=Na+, NH4+; Z=Co2+, Ni2+, Zn2+; n = 10–13 and the schemes for their thermolysis were established. It has been shown that ammonium salts during thermolysis form phases of the composition ZO ∙ 0.5P2O5 ∙ 11WO3 or Z6/73P6/73W66/73O3 with the structure of phosphotungsten bronze. The decomposition products of sodium salts are a mixture of phases with the structures of sodium tungstates Na2W2O7 and Na2W4O13. The research results can be used to predict thermal transformations and the composition of thermolysis products of similar complexes of HMTA and tungstenphosphatemetallates of other 3d-elements.
Study of co-crystallization of neodymium and strontium sulphates in the absence of potassium ions
Authors: Bushuev N. N. , Tatosyan G. K.
Published: December 2024

The processes of co-crystallization of neodymium and strontium sulfates have been studied using X-ray phase, X-ray spectral analyses and microscopy. For the first time, high absorption activity of crystal matrices of trigonal modification SrSO4 · 0.5H2O and its dehydrated monoclinic modification SrSO4 to isomorphic heterovalent inclusion of Nd3+ ions with the formation of moisture-resistant solid solutions were established. The parameters of the elementary cells of solid solutions and their structural proximity are determined. In a humid environment, solid solutions decompose within 6–10 hours to form stable poorly soluble individual compounds Nd2(SO4)3 · 8H2O and rhombic modification SrSO4.
Co-leaching of Li, Fe, Al, and Cu from active materials of LFP batteries
Authors: Salomatin A. M. , Zinov’eva I. V. , Zakhodyaeva Yu. A. , Voshkin A. A.
Published: December 2024

Co-leaching of the cathode and anode materials of lithium iron phosphate (LFP) batteries was studied. It was determined that the nature of mineral acid (nitric, sulfuric, hydrochloric) affects the degree of leaching of Li, Fe, Al, and Cu. Hydrochloric acid was chosen as the most suitable leaching agent. The effect of the following parameters of the leaching of active materials was investigated: process duration, temperature, hydrochloric acid concentration, and solid : liquid ratio. For complete leaching of copper, hydrogen peroxide was used as an oxidizing agent. The conditions for the most complete extraction of target elements were found to be 25°C, 2 h, 2 M hydrochloric acid solution, 0.05 M H2O2 solution, solid : liquid ratio 1 : 50. The possibility of sufficiently complete leaching of the main elements from spent LFP batteries at room temperature was demonstrated.
Features of the Synthesis of InGaMgO4 from Nitrate-Organic Precursors and the Study of Its’ Physical Properties
Authors: Smirnova M. N. , Kondratyeva O. N. , Nikiforova G. E. , Yapryntsev A. D. , Averin A. A. , Khoroshilov A. V.
Published: December 2024

This work reports on the possibility of producing the InGaMgO4 oxide by two-stage heat treatment of glycine-, starch- and PVA-nitrate precursors. The products formed as a result of their heating at low temperatures (≈ 90°С) were studied by powder X-ray diffraction. It was found that the powder formed from the glycine-nitrate precursor contains nanocrystalline In2O3, and drying of the polymer-nitrate compositions leads to the production of a thermally stable X-ray amorphous product. Its' annealing at temperatures above 800°C allows synthesizing InGaMgO4 powder free of impurity phases. High-temperature treatment of the powder formed from the glycine-nitrate precursor also leads to the production of InGaMgO4, but does not remove the In2O3 impurity. Using scanning electron microscopy, it was found that single-phase InGaMgO4 powders synthesized from polymer-nitrate precursors have a similar grain structure but differ in grain size distribution. Presumably, this difference is due to the structural features of starch and PVA macromolecules used for the preparation of precursors. The InGaMgO4 oxide was characterized using differential scanning calorimetry, Raman and diffuse reflectance spectroscopy. The value of its' band gap energy Eg was determined using the Tauc method.
Synthesis, Crystal Structure and Magnetic Properties of Y3–xCex(Fe0.5Ga0.5)5O12 (х = 0, 0.5)
Authors: Romanova Е. S. , Smirnova M. N. , Nikiforova G. E. , Ketsko V. A. , Yanushkevich K. I.
Published: December 2024

The specific magnetisation and magnetic susceptibility of ferrogranates of the composition Y3–xCex(Fe0.5Ga0.5)5O12 (x = 0, 0.5) obtained by the gel combustion method have been measured. It was found that after synthesis and subsequent crystallisation at pressure ≈ 10–2 Pa at 1023 K for 2 h, the temperature of magnetic phase transformation in the studied compositions Y3–xCex(Fe0.5Ga0.5)5O12 increases with the replacement of yttrium ions Y3+ by Ce3+. Partial substitution of iron ions in the ferrogranate lattice by gallium leads to the appearance of antiferromagnetic ordering with sufficiently high Curie-Weiss temperature Θef.
Low-Temperature Synthesis of Highly Dispersed Calcium Aluminate
Authors: Kozlova L. O. , Voroshilov I. L. , Ioni Yu. V. , Son A. G. , Popova A. S. , Kozerozhets I. V.
Published: December 2024

A new approach to prepare highly dispersed calcium aluminate at temperatures from 900°C with desired properties (bulk density starting from 0.015 g/cm3, particle size falling in the range of 7–42 described, which consists of step-by-step heat treatment of a concentrated aqueous solution of Al(NO3)3, Ca(NO3)2, and C6H8O7 in the molar ratio CaO : Al2O3 = 1 : 2. The main stages of the synthesis X-ray powder diffraction, IR spectroscopy, as well as scanning and transmission electron microscopies. dispersed calcium aluminate obtained using the developed approach has pronounced luminescent features.
Influence of Ionic Liquid on the Extraction of Actinides and Lanthanides(III) with Phosphorylureas from Nitric Acid Solutions
Authors: Turanov A. N. , Karandashev V. K. , Goryunov E. I. , Goryunova I. B. , Brel V. K.
Published: December 2024

The effect of the ionic liquid 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide on the extraction of U(VI), Th(IV) and lanthanides(III) from nitric acid solutions with phosphorylureas RR'P(O)NHC(O)NHC8H17 n differing in the nature of the substituents at the phosphorus atom was studied. A significant synergistic effect was discovered during the extraction of metal ions in the presence of an ionic liquid in the organic phase. The stoichiometry of the extracted complexes was determined. The influence of the structure of the extractant, the nature of the organic diluent, and the concentration of HNO3 in the aqueous phase on the efficiency of the extraction of metal ions into the organic phase is considered.
Muscle System of Aspidogaster limacoides (Trematoda, Aspidogastridae )
Authors: Yastrebova I. V. , Yastrebov M. V.
Published: December 2024

The article describes the musculature of the body, the pharynx and the ventral disc of Aspidogaster limacoides. The body wall contains three muscle layers: circular, longitudinal and diagonal. Numerous chordal muscles oriented both transversely and longitudinally, along with body wall and radial musculature, precondition the oral funnel mobility. Apart from radial, the pharynx musculature includes outer longitudinal, inner circular and outer circular muscles, the latter forming the anterior sphincter. The ventral disc being alveolar in its structure, the diversity of its musculature is restricted: the septa contain no chordal muscles or sphincters. The architectonics of parenchymal musculature has three main features resulting from large disc size, i.e. the presence of two muscle septa in the parenchima, dorso-ventral musculature being located latero-ventrally from muscle septa and a considerable development of viscero-motor muscles.
Mutual Influence of Cyanobacteria and Green Algae in Cocultures Using the Example of Dolichospermum spiroides, Planktothrix agardhii, and Chlorella vulgaris
Authors: Gaysina L. A. , Novikova N. Y. , Gibadullina N. B. , Padalka A. A. , Pavlyuk T. E.
Published: December 2024

The excessive intake of biogenic elements into water bodies leads to the active development of planktonic algae, water bloom pathogens, which mostly include cyanobacteria. In vitro studies have allowed us to test a working hypothesis on the absence of any inhibitory effect of metabolites of the Chlorella vulgaris BIN strain on the CALU 799 Dolichospermum spiroides (Klebhan) Wacklin, L. Hoffmann Komárek and CALU 1749 Planktothrix agardhii (Gomont) Anagnostidis Komárek cyanobacterial cultures in working concentrations of 1 : 1, 10 : 1, 100 : 1, and 1000 : 1 (cyanobacteria : chlorella). In a series of experiments, no effect of chlorella culture on the viability of cells of the studied cyanobacteria has been detected. However, high cyanobacteria densities (concentrations of 1 : 1, 10 : 1, 100 : 1, and 1000 : 1) are associated with an increase in the number of dead chlorella cells. The toxic effect of the CALU 799 D. spiroides strain is more pronounced in comparison with that of CALU 1749 Planktothrix agardhii.