bluuebunny/crossref_metadata_2025 huggingface dataset:
VALIDATION OF A METHOD FOR MEASURING THE FECAL GLUCOCORTICOID METABOLITES IN THE MIDDAY GERBIL (MERIONES MERIDIANUS PALLAS 1773, MURIDAE, RODENTIA): BIOLOGICAL AND PHYSIOLOGICAL APPROACHES
Authors: Surkova E. N. , Savinetskaya L. E. , Tchabovsky A. V.
Published: April 2024

Estimating the level of stress in natural populations opens the opportunities for studying various populational processes, including population dynamics, range expansions, and colonization. Over two last decades, methods for a non-invasive assay of the glucocorticoid levels have been actively developed and widely implemented in various biological fields. They are most suitable for assessing long-term stress, but require a validation procedure for each new animal species studied. We have conducted a biological and physiological validation of a non-invasive method for the determination of fecal glucocorticoid metabolites (FGM) in the Midday gerbil, Meriones meridianus. Both methods showed a significant increase in the concentration of FGM after a similar time after manipulations (4–5 h after the stressful procedures or the administration of ACTH), and peak values were twice the baseline. Saline injection (control group) did not cause a significant increase in FGM concentration, this confirming that the non-invasive measuring a smoothed level of FGM is more suitable for assessing a long-term stress, in contrast to the assay of glucocorticoids in the blood. The biological validation was as effective as ACTG-test, which is commonly considered more reliable. Given the low invasiveness of the biological method, this expands the possibilities for its application.
This research was supported by the Russian Science Foundation (project number 22-14-00223, https://rscf.ru/project/22-14-00223/).
ON THE PATTERNS AND CAUSES OF CHRONOGRAPHIC VARIABILITY OF MORPHOLOGICAL CHARACTERISTICS IN SOME MAMMALS: THE ORDERS RODENTIA AND CARNIVORA
Authors: Lobkov V. A.
Published: April 2024

Chronographic variations in some craniological features in the Spotted ground squirrel, the Red fox and the Wolf in the middle of the 20th to early 21st centuries have been established. They represent their temporary deviations from the average size towards an increase which, after several generations, is replaced by a return to the original values. The influence of trophic and climatic factors, parasites, diseases and population densities during the development of young individuals is considered. Chronographic changes in the condylobasal length and zygomatic width of the skull are established as temporary and reversible, increases in their values being replaced by their decreases. Increases in the size of the skull of the Spotted ground squirrel and the Red fox occur “suddenly” in individuals of one generation, and their return to the initial values occurs gradually in individuals of several subsequent generations. Chronographic variations in the size of the skull of the Spotted ground squirrel and the Red fox correlate with changes in reproduction rates and some other varying factors. They correspond to certain phases of population abundance. Increased sizes of the Red fox and Wolf skulls are observed in the phases of quitting a depression to the beginning of a population growth. The probable causes of chronographic changes lie in somatic heterosis, caused in natural habitats by the alternation of the prevailing mating types (inbreeding or outbreeding), these being due to massive rearrangements of individuals as a result of deep population reductions from natural or anthropogenic impacts.
FIRST RECORD OF CRYPTOPS HORTENSIS (DONOVAN 1810) (SCOLOPENDROMORPHA, CRYPTOPIDAE) IN THE CIS-URALS
Authors: Farzalieva G. Sh. , Vilkova E. S.
Published: April 2024

The species Cryptops hortensis (Donovan 1810), as well as the family Cryptopidae and the order Scolopendromorpha to which it belongs, were first discovered in the Urals. All records of this species in the Cis-Urals and in the Asian part of Russia were made in greenhouses. Distribution notes are given, and all records of Cryptops hortensis in Russia are mapped.
Iron Tricarbonyl Complexes Based on N,N'-Disubstituted Phenanthrenediimines
Authors: Kazakov G. G. , Druzhkov N. O. , Baranov E. V. , Cherkasov V. K.
Published: April 2024

The oxidative addition of N,N'-disubstituted phenanthrenediimines to iron carbonyls was studied. The reactions of acceptor phenanthrenediimines with Fe2(CO)9 give iron(I) tricarbonyl complexes with anion-radical forms of the ligands. The synthesized compounds were characterized by NMR and IR spectroscopy. The structures of the complex based on N,N'-bis(3-trifluoromethylphenyl)phenanthrenediimine and imidazol-2-one ligand was established by X-ray diffraction (XRD) (CIF files СCDC nos. 2173471 and 2173472, respectively).
Crystal Structure of Magnesium Comenate
Authors: Ivashchenko L. I. , Kozin S. V. , Vasil’eva L. V. , Vasil’ev A. M. , Dotsenko V. V. , Aksenov N. A. , Kravtsov A. A.
Published: April 2024

The coordination compound [Mg(HCom)2(H2O)6]·2H2O (I) was obtained by the reaction of comenic acid (H2Com) with magnesium acetate in water. The formation of a new phase was confirmed by powder X-ray diffraction. The molecular formula of the compound was determined from energy dispersive X-ray fluorescence and thermogravimetry data. The thermo-oxidative stability of magnesium comenate was studied by simultaneous thermal analysis in air. The molecular structure of the complex was discussed on the basis of spectral data (NMR, IR, and UV spectroscopy) and studied in detail using X-ray diffraction (CCDC no. 2 207 835). Magnesium comenate crystallizes in the triclinic system, space group P1¯,the structure is stabilized by intra- and intermolecular hydrogen bonds between the coordinated water molecules, acid anions, and [Mg(H2O)6]2+.
Second Example of a Cubane-Like Nickel(II) Complex in a Series of N-Derivatives of Taurine
Authors: Zemlyakova E. O. , Khamidullina L A. , Puzyrev I. S. , Tobysheva P. D. , Petrova Yu. S. , Neudachina L. K. , Slepukhin P. A. , Pestov A. V.
Published: April 2024

A new homometallic cubane-like nickel(II) complex based on N-2-(2-pyridyl)ethyl-2-aminoethanesulfonic acid [Ni4L4(OH)4]·2H2O (I) is synthesized, and its structure is studied by X-ray diffraction (XRD) (CIF file CCDC no. 2211359). In crystals of the complex, the metallocenters are joined into tetrahedra with the Ni…Ni distances (3.144–3.201 Å) supplemented to cubanes by the μ3-bridging oxygen atoms of the hydroxy groups. The coordination environment of each metallocenter is a distorted octahedron. The ligand is deprotonated, exists in the facial conformation, and performs the tridentate function to form two six-membered conjugated chelate cycles.
Influence of the Aromatic Ligand Nature and Synthesis Conditions on the Structures of the Copper Pentafluorobenzoate Complexes
Authors: Kovalev V. V. , Shmelev M. A. , Kuznetsova G. N. , Erakhtina V. I. , Razgonyaeva G. A. , Ivanova T. M. , Kiskin M. A. , Sidorov A. A. , Eremenko I. L.
Published: April 2024

New pentafluorobenzoate (Рfb) copper complexes with 2,3- and 3,5-lutidine (2,3- and 3,5-Lut, respectively), quinoline (Quin), and 1,10-phenanthroline (Рhen) ([Cu2(MeCN)2(Рfb)4] (I), [Cu(2,3-Lut)2(Pfb)2] (II), [Cu(3,5-Lut)4(Pfb)2] (III), [Cu(Quin)2(Pfb)2] (IV), and [Cu2(Phen)2(Pfb)4] (V)) are synthesized by the newly developed methods and characterized. The unusual heteroanionic pentafluorobenzoate benzoate (Вnz) ionic compound [Cu2(Рhen)2(Рfb)3]+(Рnz)– (VI) is synthesized. It is shown that the four-bridge binuclear metal cage of complex I is not retained in the reactions with various pyridine derivatives. In the case of such α-substituted pyridines as 2,3-lutidine and quinoline, the compositions and structures of the final products of the reactions with copper pentafluorobenzoate are independent of the initial ratio of the reagents and crystallization conditions. It is revealed by the Hirshfeld surface analysis that π···π, C–F···π, C–H···F, and F···F interactions make the major contribution to the stabilization of crystal packings of the synthesized complexes.
Praseodymium and Erbium 1,2,4-Triphenylcyclopentadienyl Complexes
Authors: Degtyareva S. S. , Bardonov D. A. , Lysenko K. A. , Minyaev M. E. , Nifant’ev I. E. , Roitershtein D. M.
Published: April 2024

The reaction of triphenylcyclopentadienyl potassium with praseodymium and erbium chloride tetrahydrofuranates gives, depending on the reactant ratio, tetranuclear ate complexes, [{(Ph3C5H2)-Pr(THF)}2(µ2-Cl)2(µ3-Cl)3K]2(C7H8)4 (I) and [{(Ph3C5H2)Er(THF)}2(µ2-Cl)2(µ3-Cl)3K(THF)]2 (III), or binuclear ate complexes [(Ph3C5H2)2LnCl(KCl)]2 Ln = Pr (II), Er (IV) (CCDC nos. 2224244 (I), 2224243 (II), 2224245 (III), 2224242 (IV)). The structurally similar complexes I and III are based on the {[Ln2(µ-Cl)3]2(µ-Cl)2K2} core, and in III, the potassium cation is additionally coordinated to the THF molecule. The isostructural complexes II and IV have the binuclear [Ln(µ-Cl)2K]2 core.
Cytotoxic Copper(II) Complexes Based on 2,2'-Bipyridine/1,10-
Phenanthroline and 5-(4-Chlorophenyl)-1H-tetrazole:
Synthesis and Structures
Authors: Golubeva Yu. A. , Smirnova K. S. , Klyushova L. S. , Berezin A. S. , Lider E. V.
Published: April 2024

Five coordination compounds [Cu2(Bipy)2L4]·C2H5OH (Iа, Ib), [Cu2(Dmbipy)2L4] (II),[Cu2(Phen)2L4]·H2O (IIIa), [Cu2(Dmphen)2L4] (IVa), and [Cu2(Phendione’)2L4]·2C2H5OH·2H2O (V) aresynthesized from 5-(4-chlorophenyl)-1H-tetrazole (HL), where Bipy is 2,2'-bipyridine, Dmbipy is 4,4'-dimethyl-2,2'-bipyridine, Phen is 1,10-phenanthroline, Dmphen is 4,7-dimethyl-1,10-phenanthroline, andPhendione’ is 6-ethoxy-6-hydroxy-1,10-phenanthrolin-5-one. The crystal structures of the complexes aredetermined by X-ray diffraction (XRD) of single crystals (CIF files CCDC nos. 2225368 (Ia), 2225369 (Ib),2225370 (II), 2225372 (IIIa), 2225373 (IVa), and 2225371 (V)). The compounds are binuclear due to thebridging function of the tetrazolate anion, and the coordination number of copper is five in all synthesizedcomplexes. The cytotoxic activity of the complexes against the Hep2 and HepG2 cancer cell lines and noncanceroushuman fibroblasts MRC-5 is studied. The complexes exhibit pronounced cytotoxic properties, andcompound V has the maximum selectivity index with respect to the cancer cells.
Complexes of Silver 1,1,1,5,5,6,6,6-Octafluorohexane-2,4-dionate with π-Donor Ligands: Synthesis, Structure, and Thermal Properties
Authors: Vikulova E. S. , Il’in I. Yu. , Sukhikh T. S. , Artamonova P. K. , Morozova N. B.
Published: April 2024

Two new Ag(I) complexes with 1,1,1,5,5,6,6,6-octafluorohexane-2,4-dionate ion (Ofhac) and π‑donor neutral ligands, vinyltriethylsilane (VTES) or cycloocta-1,5-diene (COD), were synthesized with the goal to expand the library of silver precursors for chemical vapor deposition. The products were characterized by elemental analysis and IR and NMR spectroscopy. The complex [Ag(VTES)(Ofhac)] (I) was liquid under standard conditions; the temperature of its crystallization was below –20°C. Treatment of I with benzene gave rise to crystals of [Ag4(C6H6)2(Ofhac)4]∞ (II), which was confirmed by NMR and X-ray diffraction (CCDC no. 2232810). The structure of [Ag(COD)(Ofhac)]2 (III) was established by X-ray diffraction (CCDC no. 2232809). The binuclear molecules are formed due to the μ2-κ1(O):κ1(O') function of the Ofhac ligands (Ag–O, 2.458(2)–2.461(2) Å), while COD is κ2-η2:η2-coordinated (Ag–C, 2.420(17)–2.684(11) Å). The thermal properties of I and III in comparison with analogues containing 1,1,1,5,5,5-hexafluoropentane-2,4-dionate ion (Hfac) were studied by thermogravimetry.
Synthesis and Structure of Heterometallic Compounds with Dimethyl Pyridine-2,6-dicarboxylate
Authors: Bulhac I. , Ureche D. , Kravtsov V. , Bourosh P.
Published: April 2024

Dimethyl pyridine-2,6-carboxylate (L) was prepared by refluxing pyridine-2,6-dicarbonyl dichloride in methanol. The reactions of L with Ca(II), Sr(II), and Ba(II) salts and with cobalt(II) thiocyanate resulted in the formation of three heterometallic complexes: [CaL3][Co(NCS)4] (I), [SrL3][Co(NCS)4] (II), and [BaCoL3(μ-NCS)2(NCS-κN)2] (III). The composition and structure of compounds L and I–III were determined by elemental analysis, infrared spectroscopy, and X-ray diffraction (CCDC nos. 2166019–2166022, respectively). It was found that isostructural Ca(II) and Sr(II) compounds are ionic and are formed by the [CaL3]2+ and [SrL3]2+ complex cations and [Co(SCN)4]2– complex anion, while the Ba(II) derivative is a molecular complex in which [BaL3]2+ and [Co(NCS)4]2– moieties are linked by two (NCS)– bridging units of the complex anions. In any of the three compounds, three tridentate L ligands are coordinated to the alkaline earth metal ion.
Low-temperature behavior of heat capacity and pho-toluminescence of a binuclear pivalate complex [Eu2(bath)2(piv)6]
Authors: Fomina I. G. , Tyurin A. V. , Zavorotny Yu. S. , Eremenko I. L.
Published: April 2024

The low-temperature behavior of the heat capacity and photoluminescence of the previously structurally characterized binuclear pivalate complex [Eu2(bath)2(piv)6] (monoclinic, I2/a) (1), where bath = 4,7-diphenyl-1,10-phenanthroline, piv = (CH3)3CCO2-. Using the adiabatic calorimetry method, the temperature dependence of the heat capacity was measured in the temperature range 5.96–302.88 K and the thermodynamic functions Cp0(T), S0(T), Ф0(Т) and Н0(Т) - Н0(0) were calculated. The absence of low-temperature phase transformations of complex 1 was shown. It was established that in the temperature range 98-295 K, complex 1 demonstrates high temperature stability of the integral intensity of photoluminescence of the transitions of the Eu3+ ion 5D0-7Fj (j = 0.6).
Reactions of palladium(II) chloride with monoiminoacenaphthenones
Authors: Lukoyanov A. N. , Romashev N. F. , Komlyagina V. I. , Kokovkin V. V. , Cherkasov A. V. , Gushchin A. L.
Published: April 2024

When PdCl2 reacts with [2,6-diisopropylphenyl]iminoacenaphthenone (dpp-mian) in dichloromethane, the compound 2[Pd(dpp-mian)Cl2]*[Pd(dpp-mian)2Cl2] (1) is formed. It contains two structural units: [Pd(dpp-mian)Cl2], in which dpp-mian is coordinated to Pd(II) in a bidentate-chelate manner by nitrogen and oxygen atoms, and [Pd(dpp-mian)2Cl2], in which two dpp-mian molecules are bonded to palladium only through a nitrogen atom. On the other hand, when PdCl2 interacts with [4-methoxyphenyl]iminoacenaphthenone (4-MeOPh-mian) in dichloromethane, a rearrangement of the ligand structure occurs, followed by the formation of the previously described in the literature complex of Pd(II) with 1,2-bis-[4-methoxyphenyl ]iminoacenaphthene (4-MeOPh-bian) of the composition [Pd(4-MeOPh-bian)Cl2] (2). Compound 1 was obtained for the first time and characterized by X-ray diffraction, as well as by X-ray diffraction, elemental analysis, IR spectroscopy and cyclic voltammetry.
A New Biocompatible Metal-Organic Framework Prepared by Green Chemistry Methods
Authors: Maiorova E. A. , Pak A. M. , Nelyubina Yu. V. , Novikov V. V.
Published: April 2024

A new biocompatible metal-organic framework [Mg(Mal)(H2O)](H2O) (H2Mal = malic acid) (I) was synthesized under solvothermal conditions, isolated in a pure state, and characterized by elemental analysis and X-ray diffraction. Compound I, which is the second example of a magnesium metal-organic framework based on malic acid, was prepared under drastic conditions of solvothermal synthesis. Cysteine or products of its decomposition were found to have a template effect on the formation of malic acid-based metal-organic frameworks under the chosen drastic conditions.
Cationic Complexes of 3a,6a-Diaza-1,4-diphosphapentalenes
Authors: Sushev V. V. , Panova Yu. S. , Khristolyubova A. V. , Zolotareva N. V. , Grishin M. D. , Baranov E. V. , Fukin G. K. , Kornev A. N.
Published: April 2024

The reactions of annulated 1,4-dichloro-3a,6a-diaza-1,4-diphosphapentalenes (DDPCl2) with 1 equiv. of trimethylsilyl triflate (TMSOTf) lead to replacement of one chlorine atom with the triflate group, thus giving cationic diazadiphosphapentalenes [ClDDP]+[TfO]−. In the presence of 2 equiv. of TMSOTf and 2 equiv. of 4‑dimethylaminopyridine (DMAP), the DDP dication stabilized by two DMAP molecules, [DDP(DMAP)2]2+[(CF3SO3)−]2, is formed. The DMAP molecules are located on one side of the DDP skeleton and lie in parallel planes. Free diazadiphosphapentalene was detected in solutions of [DDP(DMAP)2]2+[(CF3SO3)−]2 in CH2Cl2 by UV-Vis spectroscopy and CV. This implies that this compound disproportionates under these conditions; it is unstable in dilute solutions and decomposes to give [DMAP∙HOTf] in a quantitative yield. Crystallographic data for the obtained compounds: CCDC nos. 2182881–2182883.
Crystallochemical Role of Benzoate and Phenylacetate Ions in Structures of Coordination 3d-Metal Compounds
Authors: Karasev M. O. , Fomina V. A. , Karaseva I. N. , Pushkin D. V.
Published: April 2024

A crystal chemical analysis of the 3d-metal benzoate- and phenylacetate-containing compounds is carried out in terms of the stereoatomic crystal structure model using characteristics of the Voronoi–Dirichlet polyhedra. Coordination types of benzoate and phenylacetate anions toward the transition metals from Ti to Zn are considered. The influence of the coordination type on the characteristics of M–O bonds in the crystal structures is revealed. The electron-donating ability of benzoate and phenylacetate anions toward 3d metals is quantitatively estimated using the 18-electron rule.
Chemical transformations of bimetallic complex [Pd(OOCMe)4Mn] in reactions with 1,10-phenanthroline, pivalic acid and 5-nitro-1,10-phenantroline
Authors: Sosunov E. A. , Maksimova A. D. , Yakushev I. A. , Ogarkova N. K. , Vargaftik M. N. , Popova A. S.
Published: April 2024

A number of new bimetallic acetate and pivalate complexes of the Pd–Mn system have been synthesized and structurally characterized. The starting complex [Pd(OOCMe)4Mn] reacts with N donor ligands such as 1,10-phenanthroline to form [Pd(OOCMe)4Mn(phen)]·MeCN (I) (CIF file CCDC no. 2217716). The reactions of substitution of acetate bridges for pivalate bridges in heterometallic carboxylate Pd–Mn complexes have been studied; It has been shown that complete replacement of all acetate bridges with pivalate bridges is possible both in the heterometallic complex (I), in which there is a ligand coordinated to an additional metal atom, with the formation of the compound [Pd(Piv)4Mn(phen)]·C6H6, (II) ( CIF file CCDC No. 2217717), structurally close to the original acetate complex, and in the acetate complex [Pd(OOCMe)4Mn]. The heterometallic pivalate cocrystallizate [Pd(Piv)4Mn 2HPiv] (III) obtained in the latter case (CIF file CCDC No. 2217718) is capable of reacting with 5-nitro-1,10-phenanthroline to form the complex [Pd(Piv)4Mn( nphen)] (IV) (CIF file CCDC No. 2217719).
Image of Mantle Plume Processes in the Satellite Magnetic Field Over Africa Territory
Authors: Abramova L. M. , Varentsov I. M. , Abramova D. Yu.
Published: April 2024

The spatial distribution of the lithospheric magnetic anomalies field carries information about its sources – deep tectonic structures – and reflects the processes occurring at mantle depths. Based on the geomagnetic data measured by the CHAMP satellite at an observation altitude of ~290 km, the lithospheric magnetic field parameters over the territory of the African continent were calculated. A lot of maps of the lithospheric magnetic anomalies field total intensity Ta based on various scales and degrees have been constructed. The distribution of Ta over the territories of South and East Africa is given. An analysis of lithospheric magnetic anomalies maps over the territories of African superplume influence showed good agreement with the existing hypothesis about the mantle superplume flow intrusion from the lower mantle to the upper mantle in the northeast direction and its further spread under the East African rift zone. The obtained parameters of the anomalous lithospheric magnetic field contain information about the magnetization of the lithosphere deep layers, reflecting the magnetic properties of large regional tectonic structures and the topography of the Curie surface, which is associated with the geothermal regime and tectonic setting at different levels of the lithosphere. The work shows the perspective of the geomagnetic field satellite observations using in the study of the active zones tectonics and mapping of deep lithosphere heterogeneities in hard-to-reach areas.
Structure of the Earth’s Crust According to the Gravity Data of the GOCE Satellite Mission and Spatial Position of Polymetallic Deposits in the Frame of the Siberian and Eastern European Platforms
Authors: Galyamov A. L. , Volkov A. V. , Lobanov K. V. , Murashov K. Yu.
Published: April 2024

The results of recent study of the Earth’s crust based on the gravity data of the GOCE satellite were used for a comparative metallogenic analysis of the geodynamic settings of polymetallic deposits in the folded frame of Siberian and East European platforms. It is shown that deposits of the SEDEX type are more often located in the earth’s crust with the predominant development of the lower “basalt” layer. Pyrite copper and lead-zinc deposits (VMS), as well as some occurrences of the SEDEX type, are known in subduction island-arc and accretionary settings on the crust with the predominant development of the middle “granite” layer. Pb–Zn ores of the MVT-type are localized in deep pericratonic sedimentary oilgas basins on the shelf and continental slope, with no spatial relationship with the stratification of the earth’s crust. The Ag-polymetallic mineralization of Taimyr and Western Verkhoyansk are confined to deep pericratonic rift troughs on the passive continental margin, have a similar ore-bearing environment and may be considered as a single silver-polymetallic Taimyr-West Verkhoyansk belt. The obtained results to confirm the prospects of Pb–Zn deposits in Central and Eastern Taimyr, as well as the Saurey ore region (Polar Urals) and the need for their further research.
Satellite-Based Mapping of the Negative Impact of Gold Mining Enterprises on the Natural Environment of the Cryolithozone (On the Example of the Magadan Region)
Authors: Ilyushina P. G. , Shikhov A. N. , Makarieva O. M.
Published: April 2024

Gold mining at ore and alluvial deposits causes a substantial negative impact on the natural environment, in particular land degradation and contamination of watercourses with suspended solids. In this study, we consider a methodology for identifying and mapping the negative impact of gold mining enterprises on the natural environment based on a long-term series of free-available Landsat and Sentinel-2 satellite images. The study was carried out on the example of Tenkinsky, Susumansky and Yagodninsky districts of the Magadan region, where the largest gold deposits are located. Identification features of active mining areas, as well as abandoned ones (on which vegetation began to recover), have been found on satellite images. Based on expert interpretation of the images and NDVI analysis, it was found that about 2% of the study area was affected by gold mining. The processes of vegetation recovery were identified only on 10% of the degraded lands. In the Tenkinsky district, the area of disturbed lands for the period 2001–2021 increased by more than 7 times, which is associated with a substantial increase in gold mining. Using the C2RCC processor (module of the SNAP software package), the content of suspended solids in the water of the most impacted rivers Berelekh, Ayan-Yuryakh and Kolyma, was estimated in comparison with natural values (typical for non-contaminated water). We found that the main source of suspended matter in the rivers is the alluvial gold deposits located in the floodplain of the Berelekh river. At the same time, the seasonal variability of water contamination is determined by hydrological situation. In particular, water turbidity decreases during low water periods and increases during high-flow periods.
Model Calculations of Ozone Content in the Atmosphere by Earth’s Outgoing Radiation
Authors: Shishigin S. A.
Published: April 2024

The model of the atmosphere in the form of a sequence of homogeneous layers 100 meters thick from the surface of the Earth to a height of 40 kilometers is considered. Layer parameters are defined for the standard atmosphere. Spectral sections 1002–1003 and 1020–1021 cm–1 with opposite dependence of ozone absorption coefficient on its temperature change are selected. This model was transformed into one efficient homogeneous layer. The contribution to the outgoing radiation of the atmosphere in the selected spectral regions of the ozone absorption band (1002–1003 and 1020–1021 cm–1) is equal to the contributions to the outgoing radiation of the Earth by all non-uniform layers constituting them. The possibility of adjusting the temperature of the Earth’s underlying surface is shown. The method of calculating the ozone content in the atmosphere by the outgoing radiation of the Earth is considered.
Retrieval of Cloud Liquid Water from MSU-GS Data On-Board Arctica-M No. 1
Authors: Filei A. A. , Shamilova Yu. A.
Published: April 2024

The paper presents the method for cloud water path retrieval from daytime MSU-GS measurements on board the Russian hydrometeorological satellite Arktika-M No. 1. The presented technique based on the physical principles of the interaction of electromagnetic radiation with cloud particles at wavelengths of 0.55 and 4.0 μm. Cloud water path estimates obtained from the MSU-GS radiometer where compared with similar estimates from the AMSU/MHS and AHI radiometer data. Based on the results of the comparison, the required estimates of the cloud water path of drop clouds are within the permissible limits of the measurement error, not exceeding 50 g/m2. At the same time, due to its design features, the MSU-GS radiometer does not allow retrieving the cloud water path of ice clouds with the required accuracy. On average, the cloud water path estimate of ice clouds according to the MSU-GS data is underestimated by 110 g/m2, and the root-mean-square error is 158 g/m2 compared to the AHI radiometer data. The obtained estimates of the cloud water path introduced into the geographic information system Arktika-M, which provides access to the Arktika-M No. 1 data and the results of their thematic processing in a near real time mode.
Developing the Model of the Morphological Pattern for Thermokarst Plains with Fluvial Erosion Involving Remote Sensing Data
Authors: Victorov A. S. , Kapralova V. N. , Orlov T. V.
Published: April 2024

The paper reports a new variant of the model of the morphological pattern for thermokarst plains with fluvial erosion involving numerous remote sensing data. This variant of the model takes into account different trends of the thermokarst processes for watershed plains and lowered bottoms of khasyreis (drained thermokarst lakes). The given model is tested at eight key sites located in different physiography, climate and geocryology. Testing was based on the high-resolution remote sensing data. The developed model is verified with a statistical analysis of lake area distributions within both watershed plain surface and lowered bottoms of khasyreis, demonstrating a state of dynamic balance in the course of emergence, growth and drainage of the thermokarst lakes. The analysis shows that the morphological pattern of the thermokarst plains with fluvial erosion changes evolutionarily, with reducing the area of the main watershed surface according to a dependence close to exponential; the specific type of the dependence results primarily from the ratio of the lake generation density and the location density of the fluvial sources.
Geoinformation Analysis of the Impact of State Protective Forest Belts on the Productivity of Agricultural Land
Authors: Vypritskiy A. A. , Yuferev V. G.
Published: April 2024

Determining the patterns of changes in the productivity of agricultural land in different areas used for growing agricultural land in the zone of influence of State Forest Strips (GZLP) is relevant due to the need to assess the future crop yield in fields with differences in geomorphological, soil and climatic conditions in the research area. An object. Sowing of winter grain crops in fields mixed within the influence of State forest strips. Materials and methods. The research methodology is based on the geoinformation analysis of the results of the decryption of actual satellite images, both to identify the distribution of cultivated fields located in the zone of influence of GZLP, and the state of crops on them. At the same time, the soil zonality of the research area was taken into account in view of the considerable length of forest strips. The assessment of the condition of winter grain crops as they move away from the planting was carried out using the NDVI vegetation index calculated from the high-resolution spectral channels of satellite images. Results and conclusions. Based on the results of the research, a database of spatial data of the processed fields has been compiled. The grouping of fields was carried out both according to the similarity of the conditions of the places of cultivation of crops and by agricultural crops. Their placement and geomorphological parameters have been established. With the use of geoinformation technologies for groups of fields using statistical processing tools, the average values of the width and area of the selected zones of influence, as well as terrain parameters, were determined. During geoinformation mapping, data on the state of crops at the end of May were obtained based on the change in the NDVI index by field groupings in the zone of GPLP impact. These data are the basis for the forecast of crop yields, taking into account the spatial location of fields.
Lithospheric Magnetic Anomalies According to the CHAMP Satellite Data over the Western Himalayan Syntaxis and Surrounding Areas
Authors: Abramova D. Yu. , Abramova L. M.
Published: April 2024

The spatial distribution of the lithospheric magnetic anomalies field obtained from the German Earth satellite CHAMP measurements for several years of its mission is investigated over the territory of the Indo-Asian collision, in particular, the Tarim region and the Western Himalayan Syntax (WHS). Maps of the total intensity Ta of the lithospheric magnetic field for these regions are give. The lithospheric magnetic anomalies field as a reflection of the consequences of the Indian lithospheric plate subduction under the Eurasian plate is discussed in the context of modern ideas about the regional geological and tectonic structure. The inversion of the magnetic anomalies sign over the northern part of the Indian Plate observed on Ta maps is supposed as a result of the lower crust heating due to mantle processes, the rise of the Curie isotherm and, as a consequence, the loss of the initial magnetization of the lower crust. In order to study in detail the WHS and surrounding territory, maps of the lithospheric magnetic anomalies field are constructed at the lowest level of CHAMP orbit which leads to increase their resolution by nearing to the field sources. The relationship of detected regional anomalies with tectonic processes in this seismically active area and with other available geophysical information is discussed. Interpretation of the revealed information shows that the images of lithospheric magnetic anomalies distinctly correlate with modern view at the large-scale geological and tectonic structures location.
Influence of the Quasi-Biennial Oscillation on the Dynamics of the Stratospheric Polar Vortices According to Satellite Observations
Authors: Zuev V. V. , Maslennikova E. A. , Savelieva E. S.
Published: April 2024

The duration of polar ozone depletion events depends on the phase of the quasi-biennial oscillation (QBO). The QBO determines the location of the subtropical critical wind line that influences the propagation of planetary waves into the stratosphere. As a result, the polar vortex intensifies during the western phase of the QBO and weakens during the eastern phase, which manifests itself in the timing, duration, and intensity of stratospheric ozone depletion. Polar ozone depletion occurs inside the strong polar vortex from late winter to spring due to the occurrence of heterogeneous and photochemical ozone destruction reactions in the presence of solar radiation. We studied the effect of QBO phases at different isobaric levels on the dynamics of the stratospheric polar vortices based on satellite data from the Goddard Space Flight Center NASA. It is shown that the QBO at the 30 hPa pressure level has a predominant effect on the dynamics of the polar vortices. This is observed from September to December, especially in October and November, in the dynamics of the Antarctic polar vortex, and throughout the entire period of its existence in the dynamics of the Arctic polar vortex.
Changes in the Nature of Temperature Anomalies of the Black Sea Surface During the Warming Period of the Late 20th–Early 21st Centuries
Authors: Polonsky A. B. , Serebrennikov A. N.
Published: April 2024

Based on the analysis of satellite data from 1982 to 2021 with a spatial resolution of about 0.05° × 0.05°, the total increase in the Black Sea surface temperature was confirmed. Annual temperature averaged over the entire Black Sea rises with the rate of about 0.6°C/10 years. The annual temperature increment due to the linear trend is at a maximum in May–June. In these months of the hydrological spring, the rate of increase in sea surface temperature (SST) is about one and a half times greater than in October–November. For most of the year, the general warming of the surface water layer is not accompanied by a significant increase in the intra-monthly SST variance. Such an increase is observed only in some months of the transition seasons, especially during the hydrological spring, when the absolute magnitude of extreme thermal anomalies and their area significantly increases. The maximum amplitudes of interannual variations of SST are confined to the northwestern part of the Black Sea. Changes in atmospheric pressure and wind fields significantly impact on the spatiotemporal SST structure of the. Long-term trends of driving pressure above the Black Sea indicate an intensification of regional cyclonic activity in the atmosphere (especially pronounced since 2009), which leads to increased generation of the negative SST anomalies of significant amplitude. Such anomalies occur mainly in the warm half-year (especially in May and October) due to the development of wind-driven upwelling. The May and October negative SST anomalies from the range of –(6–5)°C are characterized by maximum areas. Warm anomalies are also most often recorded in May and (to a lesser extent) in October. They are generated by abnormal heat fluxes on the sea surface, including in shallow areas of the shelf and spread to open areas of the Black Sea due to horizontal advection of mainly wind origin. The described patterns of spatio-temporal SST variability and their causes are illustrated by a case-study of extreme thermal anomalies using comprehensive analysis of wind and SST fields of high spatial resolution.
Circulation and Mesoscale Eddies in the Sea of Japan from Satellite Altimetry Data
Authors: Zhabin I. A. , Dmitrieva E. V. , Taranova S. N. , Lobanov V. B.
Published: April 2024

The spatial distribution and seasonal variability of mesoscale eddies in the Sea of Japan were investigated based on the regional database created from the AVISO Atlas of Mesoscale Eddies (1993–2020). The database contains information about the trajectories and parameters of mesoscale eddies in the ocean. The eddies detection method is based on the analysis of altimetric maps of absolute dynamic topography. A total of 578 eddies with a with a lifetime of more than 90 days were identified (273 anticyclonic and 305 cyclonic). The average lifetime for the Sea of Japan regional data set of eddies is 202 days for anticyclonic and 143 days for cyclonic and mean radius of 59 ± 11 km for anticyclonic and и 61.0 ± 12 km for cyclonic. The mean speed of anticyclones and cyclones along their trajectories was 2.8 and 3.7 cm/s, the average orbital velocities of geostrophic currents were 19.0 and 15.1 cm/s, respectively. The maximum number of cases of formation and destruction of anticyclones falls in July–September during the period with high values of water inflow through the Korea Strait. Most of the cyclonic eddies are generated between January and June and decay the cold half of the year (October–March). Тhe joint analysis of maps of the mean surface circulation in the Sea of Japan (satellite altimetry data) and the spatial distribution of mesoscale eddy showed that the stable eddies of the Sea of Japan are associated with the quasi-stationary meanders of the of the East Korea current, Subpolar Front, and Tsushima current. The position of meanders is mainly determined by the interaction of the currents with the bottom topography.
Satellite Registration of Anomalies of Various Geophysical Fields during the Preparation of Destructive Earthquakes in Turkey in February 2023
Authors: Bondur V. G. , Tsidilina M. N. , Gaponova E. V. , Voronova O. S. , Gaponova M. V. , Feoktistova N. V. , Zima A. L.
Published: April 2024

Studies of variations in the parameters of various geophysical fields were carried out using satellite data during the preparation of destructive earthquakes with magnitudes of 6 ≤ M ≤ 7.8 that occurred in Turkey in February 2023. It was found that the anomalies of these parameters manifested themselves from 34 to 25 days before the earthquakes as a sharp decrease in the values of relative humidity and outgoing longwave radiation, as well as in an increase in the density of local lineaments. An increase in surface skin temperature, surface air temperature, relative humidity, outgoing longwave radiation, as well as in the values of the aerosol optical depth and ionospheric total electron content was revealed 19–9 days before the analyzed seismic events. 5–2 days before these earthquakes, a decrease in the surface skin temperature, surface air temperature, the flux of outgoing longwave radiation, the ionospheric total electron content, as well as an increase in relative humidity and in the length of the secants of the rose diagrams of regional lineaments were recorded. Quantitative characteristics of these anomalies were identified.
Transmission functions of transmissive multilayer inhomogeneous holographic photopolymer liquid crystal diffraction structures
Authors: Sharangovich S. N. , Dolgirev V. O.
Published: April 2024

A new analytical model of diffraction of quasimonochromatic light beams on spatially inhomogeneous multilayer diffraction structures formed in photopolymer material with nematic liquid crystals having smooth optical inhomogeneity in the thickness of layers is presented. It is shown that when an applied electric field isapplied to diffraction layers containing a photopolymer composition with a high proportion of liquid crystalline component, a transformation of the selective response with a significant shift in angular selectivity occurs
Floquet spectrum of Dirac crystal in the field of pulsed radiation
Authors: Kryuchkov S. V. , Kukhar E. I. , Silivanov D. A.
Published: April 2024

The Floquet spectrum of a Dirac crystal placed in the field of electromagnetic radiation which is the superposition of two waves polarized in perpendicular directions has been calculated. Each of the waves is a sequence of pulses of Gaussian profile. The quasi-energy gap dependence on both duty cycle of the signals and time shift between the signals has been studied.
Frequency multiplication in a high-current relativistic gyrotron for obtaining high-power THz-band radiation
Authors: Leontiev A. N. , Rozental R. M. , Ginzburg N. S. , Zotova I. V. , Malkin A. M. , Sergeev A. S.
Published: April 2024

Using averaged equations and 3D particle-in-cell simulations, we investigate the frequency multiplication regime in a high-current relativistic gyrotron operating in 0.1 THz frequency band. We demonstrate that the ratio of the 3rd harmonic power and the fundamental cyclotron resonance power can reach 0.4–0.8%, which aloows for obtaining the 0.3 THz radiation with sub-MW output power level.
Object structure reconstruction using correlation processing of the acoustic field of active noise sources
Authors: Dmitriev K. V.
Published: April 2024

The iterative algorithm is proposed for reconstructing the acoustic characteristics of an inhomogeneous medium based on the values of the coherence matrices obtained at several exposure angles using noise signals. Numerical simulations show good quality and fast convergence of the resulting estimates.
Analysis of cognitive load in the Sternberg problem: eye-tracker study
Authors: Brusinsky N. A. , Badarin A. A. , Andreev A. V. , Antipov V. M. , Kurkin S. A. , Hramov A. E.
Published: April 2024

We studied physiological and behavioral characteristics of a person during prolonged solution of a cognitive task based on Sternberg paradigm. We found that evaluation of subjective fatigue and physiological characteristics such as blink duration and pupil size range of motion during the task solution are correlated to each other.
Upgraded optical complex in ‘Verkhnetulomsky’ observatory: equipment and first results
Authors: Belov A. A. , Klimov P. A. , Kozelov B. V. , Murashov A. S. , Roldugin A. V. , Trofimov D. A.
Published: April 2024

A new photometer with spatial resolution was installed in addition to the all-sky camera at the “Verkhnetulomsky” observatory of the Polar Geophysical Institute, located inside the auroral zone, to study the fine space-time structure of the auroral luminescence. We described the scientific equipment and the case of simultaneous observations of pulsating auroras with internal modulation in the hertz range.
Relationship of the stable auroral red arcs height to solar activity. The observation results at the Yakutsk meridian
Authors: Ievenko I. B. , Parnikov S. G. , Sokolnikov A. V.
Published: April 2024

We presented the first results of triangulation measurements of the stable auroral red arcs height at the Yakutsk meridian in 2015–2020. The heights of the lower luminosity boundary in arcs of 350–370 km near the maximum and 250–290 km during the minimum of solar activity in the 24th cycle are obtained. The decrease of the red arcs height in the minimum years is due to the significant density decrease of the upper neutral atmosphere.
Analysis of the anomalous event GLE66 on October 29, 2003
Authors: Balabin Yu. V.
Published: April 2024

Event GLE66 (29.10.2003) is a selected study in a series of three GLE events that occurred in the fall of 2003. there was this most powerful magnetic storm and a deep Forbush effect, during which GLE66 occurred. The appearance of the T-05 drilling model of the magnetosphere and the availability of a methodology debugged on dozens of less complex GLE events for solving the problem of achieving results for this complex event. Obtaining the values of the parameters of the cosmic ray flux at subsequent moments of time. A pattern typical of GLE events is observed: the spectrum of observed cosmic rays at the initial phase has an exponential shape, and then ends in a power law. The obtained spectra are in good agreement with measurements of cosmic ray precipitation on spacecraft at lower energies.
The role of manganese substitutions of iron cathiones in changes of magnetic and electrical characteristics of BiFe1 – xMnxO3 magnetoelectrics (x = 0.05 and 0.15)
Authors: Tarasenko T. N. , Mikhaylov V. I. , Kravchenko Z. F. , Burkhovetskyi V. V. , Izotov A. I. , Legenkii Yu. A. , Zhyvulka A. M. , Yanushkevich K. I. , Aplesnin S. S.
Published: April 2024

The samples of BiFe1 – xMnxO3 solid solution system (x = 0.05 and 0.15) are ferromagnetics and semiconductors unlike BiFeO3. Growth of x leads to a decrease in Curie temperature (TC = 605 K for x = 0.05 and 550 K for x = 0.15) and growth of dielectric permittivity ε at room temperature. The decrease in the value of specific magnetization with increasing x is due to the redistribution of the volumes of ferromagnetic and antiferromagnetic phases.
Magnetic properties of nano- and microsized crystalline powders of terbium–lithium tetrafluoride
Authors: Andreev G. Iu. , Romanova I. V. , Korableva S. L. , Morozov O. A. , Semakin A. S. , Kiiamov A. G. , Tagirov M. S.
Published: April 2024

Microsized and nanosized powders of terbium tetrafluoride were synthesized. The decrease of Curie temperature of the nanosized sample was observed: TC = 2.88(4) K for the microsized sample, TC = 2.78(4) K for the nanosized sample. The field dependences of the magnetization of the microsized sample in magnetic fields up to 9 T at temperatures from 2 to 300 K were measured and calculated.
Electronic properties of the Mn3Z (Z = Ga, Ge) alloys: first-principles studies
Authors: Obambi M. A. , Zagrebin M. A. , Buchelnikov V. D.
Published: April 2024

The structural and electronic properties of Mn3Z alloys (Z = Ga, Ge) are studied ab initio. It is shown that in the cubic and tetragonal phases, the configuration with antiparallel orientation of magnetic moments of Mn atoms on different sublattices is energetically favorable. Calculations of the electronic densities of states show that the spin polarization of the tetragonal phase is about 60%. The results obtained are in good agreement with the experimental data.
Ab initio study of the heterostructure BaTiO3/Si
Authors: Zagidullina A. E. , Gumarova I. I. , Evseev А. A. , Mamin R. F.
Published: April 2024

We presented ab initio calculations of a heterostructure based on the ferroelectric phase of barium titanate and silicon. The spectra of the density of states for various configurations of the heterostructure are considered, from which it follows that a conducting state can be created in a system consisting of nonconducting components.
Influence of the supramolecular and crystal structure of polylactide on the realization of the shape memory effect
Authors: Zimina A. I. , Kovaleva P. A. , Kiselev D. A. , Krupatin I. N. , Senatov F. S.
Published: April 2024

The influence of different methods of polylactide processing on its structural parameters were studied. The thermal properties and crystallinity of the material and the relationship between these properties and its supramolecular structure were studied, as well as the impact of these parameters on the realization of the shape memory effect of polylactide.
Obtaining and research of the properties of magnetic-luminescent hybrid structures based on iron oxide (Fe3O4) with semiconductor shells
Authors: Kafeeva D. A. , Kurshanov D. A. , Dubavik A. Y.
Published: April 2024

The high-temperature organic synthesis of hydrophobic superparamagnetic nanocomposites of the Fe3O4/ZnS and Fe3O4/ZnSe core–shell type is discussed. An analysis of the absorption, luminescence, magnetic circular dichroism (MCD) and morphology spectra of hydrophobic magnetoluminescent nanocomposites is presented. It is shown that nanocomposites have luminescent properties, and the growth of the shell on the Fe3O4 core retains the magnetic properties of the particles. An analysis of the MCD spectra shows that the magnetic field induces spin-dependent chiral magneto-optical activity. An estimate of the dependence of the g factor on the magnitude and sign of the external magnetic field demonstrates a change in the magnetization of the resulting nanocomposites relative to Fe3O4.