bluuebunny/crossref_metadata_2025 huggingface dataset:
THE USE OF ALUMINUM-CONTAINING WASTE FROM THE PRODUCTION OF METALLIC CHROMIUM TO CREATE ACID-RESISTANT TILES
Authors: Abdrakhimov V. Z. , Abdrakhimovа E. S.
Published: December 2023

The use of aluminum-containing slag from the production of metallic chromium in an amount of 40 % allows to obtain acid-resistant tiles with high physical, mechanical and chemical parameters at a firing temperature of 1300 ?C. Studies have shown that the introduction of slag containing more than 70 % aluminum oxide and more than 8 % chromium oxide (trivalent) into the compositions of ceramic masses promotes the formation of high-temperature minerals: corundum (2050 ?C) and (III) Сr2О3 (sesquioxide, the mineral escolaite in nature), which has a melting point of 2435 ?C, which significantly increases the refractoriness of acid-resistant tiles.
PROPANTS BASED ON DRILLING SLURRIES
Authors: Yatsenko E. A. , Smoliy V. A. , Klimova L. V , Golovko D. A.
Published: December 2023

The work is devoted to the study of the impact of drilling waste on the ecological system, types of drill sludge recycling, the possibility of using drill sludge from the Morozovskoye deposit (Russia) for the production of proppants. In the oil industry, proppants are used for wedging layers. They are a loose material consisting of granules. Currently used proppants have different applications, which depend on the technical characteristics of the material. This study examines the prospects for the use of drilling slurries for the synthesis of aluminosilicate materials. For this purpose, studies of the slurry were conducted and the corresponding conclusion was made based on the obtained data. In the course of the research, the chemical and phase composition of the drilling sludge of the Morozovsky deposit of the Southern Federal District was determined.
METHOD FOR ELIMINATION OF FLATNESS DEFECTS ON GLASS PLATES FOR THEIR THERMAL JOINING
Authors: Milanina K. I. , Agafonov A. N. , Andreeva T. A.
Published: December 2023

A method has been developed to eliminate gaps between glass plates during thermal bonding using a system for distributing the mechanical load. Theoretical and experimental studies of the proposed method have been carried out. The results of numerical and full-scale experiments are presented, confirming the effectiveness of the proposed method.
MINERALOGICAL FEATURESOF THE EXPANDED VERMICULITE ORES
Authors: Rumi M. K. , Urazaeva E. M. , Nurmatov Sh. R. , Irmatova S. K. , Faiziev Sh. A. , Mansurova E. P. , Zufarov M. A. , Iskandarov N. E.
Published: December 2023

The natural minerals of the Tebinbulak deposit, which are used as a thermal insulation material, have been studied, while their swelling coefficient depends on the size of the raw material and ranges from 3.47 to 7.67. The structure of the material has been studied by X-ray diffraction and infrared spectroscopy. The chemical composition has been determined by the microprobe method, and phase transformations during heating by differential scanning calorimetry. The obtained-information allowed us to conclude that this micaceousmineralis at the initial stage of metamorphism: disordered interlayer structure of phlogopite/vermiculite (hydrophlogopite). The information is important when discussing the influence of the structure of hydrosludes on the possibility and nature of their swelling during heating.
ON THE APPLICATION OF CERAMICS IN DEEP WATER BUOYANCY MODULES
Authors: Shchegoleva N. E. , Kachaev A. A. , Lebedeva Y. E. , Belyachenkov I. O. , Chainikova A. S.
Published: December 2023

Today ceramic materials occupy more and more new niches of application. These include deep-water apparatuses for various purposes. For example, at present time oil production industry confronts the problem of discovering new oil and gas reserves, 40 % of which are connected with the development of ever-increasing sea depths that, in its turn, requires certain buoyancy of the submersibles to support the payload. The buoyancy can be provided either by a durable hull, or by using buoyant crafts (modules), or by both methods simultaneously. Due to high values of compressive strength, ceramics are considered as a promising material for operation at great depths, where hydrostatic pressure is significantly increased.
The paper presents the results of analysis of domestic and foreign literature in the field of creation of hollow macrospheres based on ceramics for their use in modules of buoyancy of deep-water vehicles instead of syntactic foams with glass microspheres. It is shown that the most promising material is ceramics based on aluminum oxide. The results of ceramic spheres tests under the influence of pressures corresponding to the work of deep-water apparatus at different depths are presented. The analysis of the strength evaluation of ceramic macrospheres is given, which is necessary to assess their performance efficiency.
DIELECTRIC PROPERTIES OF CERAMICS BASED ON BN–ZrB2 AND BN–ZrO2 PRODUCED BY SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS
Authors: Karpov A. V. , Sytschev A. E. , Boyarchenko O. D. , Kovalev I. D. , Belousova O. V. , Loryan V. E.
Published: December 2023

Dielectric properties of ceramic materials based on BN–ZrB2 and BN–ZrO2 systems synthesized in the mode of self-propagating high-temperature synthesis (SHS) from a mixture of boron B powders, boron nitride BN and zirconium dioxide ZrO2 in an atmosphere of nitrogen N2 have been studied. The experimental results showed that ceramics synthesized from the initial mixture of (30B + 10ZrO2 + 60BN, wt. %) composition have permittivity (?) and tangent of the dielectric loss angle (tg) values of 2.63 and 0.006, respectively, at room temperature.
CERAMIC MATERIALS BASED ON Al2O3 FOR LTCC APPLICATION
Authors: Voloschuk D. S. , Anisimov V. V. , Makarov N. A.
Published: December 2023

In the paper presents an overview on the topic of obtaining high-temperature (HTCC) and low-temperature (LTCC) ceramics. The topic observe transition from a high-temperature process of obtaining ceramic materials to a low-temperature. Typical LTCC production process and the characteristics and properties of a “classic” glass ceramic composite described hereof. The main directions of application glass ceramics obtained by LTCC technology are shown.
FABRICATION A NEW FILM SCINTILLATOR BASED ON (8-HYDROXYQINOLATE) LITHIUM
Authors: Runina K. I. , Zykova S. S. , Strekalov P. V. , Popkova L. V. , Petrova O. B. , Chepurnov A. S. , Do D. T. , Ta T. T.
Published: December 2023

Thin luminescent films of the organometallic complex of lithium 8-hydroxyquinolate (Liq) on glass substrates were fabricated by capillary deposition and lithography. A study of the spectral-luminescent properties of the obtained film structures was carried out. The analysis of the surface of the films was carried out. The light yield and the kinetics of scintillation emission of the obtained film structures are estimated.
Structure of Organic and Organoelemental Compounds. Part 1
Authors:   South Ural State University, Chelyabinsk, Russian Federation, Sharutin V.
Published: December 2023

The structure of seven organic and organoelemental compounds was determined by X-ray structural analysis (XRD). XRD analysis of compounds was performed on an automatic four-circle diffractometer D8 Quest Bruker (МоКα, λ = 0.71073 Å, 293 К. [p-Tol4Sb]{[F3CC(O)CHC(O)CF3]2Li} (1) P-1, a = 8.662(15), b = 11.964(18), c = 20.94(5) Å,  = 65.71(9), β = 95.20(7),  = 102.74(5) deg., V = 2092(7) Å3, Z = 2. [Ph4Sb][PhC(O)CHC(O)Ph] (2), P 21/n, a = 11.335(5) Å, b = 14.975(7) Å, c = 19.017(9) Å, β = 101.671(16) deg., V = 3161(3) Å3, Z = 4. HOC(O)C6H4(NO2-2) (3), P-1, a = 5.023(4), b = 7.556(10), c = 10.611(9) Å,  = 69.16(4), β = 86.07(4),  = 71.10(6) deg., V = 355.6(6) Å3, Z = 2. [Ph3PCH2Ph]Br•DMSO (4), P-1, a = 10.09(3), b = 10.85(2), c = 24.80(5) Å,  = 80.42(7), β = 80.26(9),  = 77.36(12) deg., V = 2588(10) Å3, Z = 2. [(2-MeO)(Br-5)C6H3]3Sb0.5PhH (5), P 21/n, a = 9.082(7), b = 21.248(12), c = 13.802(12) Å, β = 106.09(4) deg., V = 2559(3) Å3, Z = 4. Ph4SbNO3•PhH (6), Cc, a = 10.573(7), b = 17.484(7), c = 14.647(4) Å, β = 92.934(15) deg., V = 2704.1(16) Å3, Z = 4. [(2-MeO)(Cl-5)C6H3]3Bi • ½ PhH (7), P 21/n, a = 8.920(5) Å, b = 21.362(7) Å, c = 13.649(5) Å, β = 107.33(2) deg., V = 2482,8(17) Å3, Z = 4.
Study of Structural Characteristics of Ni-Zn-Co Ferrospinels.
Authors:   South Ural State University, Chelyabinsk, Russian Federation, Sherstyuk D. , Zhivulin V. , Starikov A. , Solizoda I. , Pavlova K. , Punda A. , Zherebtsov D. , Vinnik D. ,   South Ural State Humanitarian Pedagogical University, Chelyabinsk, Russian Federation,   Tajik National University, Dushanbe, Republic of Tajikistan
Published: December 2023

Currently, in the modern scientific literature there is an increased interest in ferrites of all types. Among them, a special place is occupied by Ni-Zn ferrite with a spinel structure. It is known that the functional properties of ferrites can be significantly changed by partial or com-plete replacement of the cations of the initial matrix with other cations differing in magnetic moment and size. Such a change in the structure makes it possible to effectively vary the proper-ties of ferrites, i.e. to provide "tuning" of the material for the required properties. An analysis of the literature in this direction has shown that the cobalt ion Co2+ is an effective substitute cation. In this study we are dealing with the Ni-Zn ferrites of variable composition, with the fixed con-tent x(Co) = 0.1. The general formula is: Co0.1Zn0.9-xNixFe2O4, (where x = 0; 0.3; 0.6; 0.9). The aim of the presented work is to synthesize samples, as well as to study their density and porosity, which in turn have a direct effect on the performance properties of ceramic ferrites. The synthesis of the samples was carried out by the solid-phase reaction method, using a high-temperature furnace in an air atmosphere. Previous studies have made it possible to identify a set of optimal physicochemical conditions under which the initial charge ferritization occurs. The initial components for preparing the charge included oxides. X-ray phase analysis and X-ray structural analysis, electron microscopy and energy dispersive X-ray spectroscopy were used as research methods. As a result of X-ray phase analysis, it has been revealed that the obtained samples are monophasic and belong to spinels of the AFe2O4 type (where element A = Ni, Zn, Co). The study of the surface morphology of the samples has revealed the presence of many crystallites of various sizes, the natural faceting of which corresponds to crystallites with a cubic syngony. Investigations of the true and X-ray density of the obtained samples have been carried out. The dependence of the influence of the substitution value x(Ni) on the porosity (density), as well as on the parameters of the elementary crystal lattice, has been determined.
Structure of Organic and Organoelemental Compounds. Part 2.
Authors:   South Ural State University, Chelyabinsk, Russian Federation, Sharutin V.
Published: December 2023

The structures of five organoantimony compounds Ph4SbOCH2Ph (1), p-Tol4SbBr (2), [Ph4Sb][I3] (3), [Ph3PCH2СHMe2][I3] (4) and [Ph3P(CH2)3PPh3]+2 [I]2  I2 (5) were determined by X-ray diffraction analysis. X-ray diffraction of the compounds was carried out on an automatic four-circle diffractometer D8 Quest Bruker (МоКα, λ = 0,71073 Å, 293 К. (1), crystal size 0.3 × 0.18 × 0.1 mm, P21/c, a = 14.512(7), b = 10.554(4), c = 17.209(9) Å, β = 106.91(2) deg., V = 2522(2) Å3, Z = 4, R1 = 0.0206, wR2 = 0.0457. (2), crystal size 0.38 × 0.22 × 0.18 mm, P21/n, a = 9.896(6), b = 23.349(11), c = 12.149(6) Å, β = 113.393(18) deg., V = 2576(2) Å3, Z = 4, R1 = 0.0321, wR2 = 0.0673. (3), crystal size 0.3×0.21×0.13 mm, P2/n, a = 10.679(18), b = 8.178(14), c = 15.07(3) Å, β = 92.89(11) deg., V = 1315(4) Å3, Z = 2, R1 = 0.0297, wR2 = 0.0589. (4), crystal size 0.27×0.14×0.05 mm, P21/c, a = 10.199(5), b = 17.886(11), c = 13.300(9) Å, β = 91.77(2), deg., V = 2425(2) Å3, Z = 4, R1 = 0.0531, wR2 = 0.1331. (5), crystal size 0.46×0.29×0.18 мм, P21, a = 8.613(3), b = 15.509(6), c = 14.875(5) Å, β = 93.349(11), deg., V = 1940(6) Å3, Z = 2, R1 = 0.0297, wR2 = 0.0678.
Synthesis and Structure of Tris(3-Fluorophenyl) Antimony Bis(2,5-Dimethylbenzenesulphonate) and Bis(Dibromo-fluoroacetate).
Authors:   South Ural State University, Chelyabinsk, Russian Federation, Senchurin V. , Filimonova D. , Khromenko V.
Published: December 2023

The interaction of tris(3-fluorophenyl)antimony with 2,5-dimethylbenzenesulfonic or dibromofluoroacetic acid in diethyl ether in the presence of tert-butyl hydroperoxide has synthe-sized tris(3-fluorophenyl)antimony bis(2,5-dimethylbenzenesulfonate) (1) and tris(3-fluorophenyl)antimony bis(dibromofluoroacetate) (2). The X-ray diffraction pattern has been obtained at 293 K on an automatic diffractometer D8 Quest Bruker (MoKα-radiation, λ = 0.71073 Å, graphite monochromator) for crystal 1 [C34H30F2O6S2Sb, M 777.45, the triclinic syngony, the symmetry group P–1; cell parameters: a 10.634(18) Å, b 11.38(2) Å, c 14.31(3) Å, α = 90.51(8) degrees, β = 90.35(11) degrees, γ = 112.79(5) degrees; V = 1596(5) Å3; the crystal size is 0.5×0.48×0.17 mm; intervals of reflection indexes are –15 ≤ h ≤ 14, –15 ≤ k ≤ 15, –19 ≤ l ≤ 19; total reflections 30473; independent reflections 8318; Rint 0.0920; GOOF 1.894; R1 = 0.1699, wR2 = 0.4237; residual electron density 6.78/–5.48 e/Å3] and crystal 2 [C22H12O4F7SbBr2, M 754.89, the triclinic syngony, the symmetry group P–1; cell parameters: a 8.98(3) Å, b 10.41(2) Å, c 14.92(3) Å, α = 90.77(7) degrees, β = 90.73(9) degrees, γ = 113.95(10) degrees; V = 1275(5) Å3; the crystal size is 0.65 × 0.32 × 0.14 mm; intervals of reflection indexes are –13 ≤ h ≤ 13, –15 ≤ k ≤ 14, –21 ≤ l ≤ 21; total reflections 61066; independent reflections 8511; Rint 0.0863; GOOF 1.983; R1 = 0.1529, wR2 = 0.4647; residual electron density 4.41/–3.48 e/Å3] the antimony atoms have a distorted trigonal-bipyramidal coordination. The axial OSbO angles are 178.2(3) (1) and 174.0(4) (2); the sum of the CSbC angles in the equatorial plane is 360. The Sb–O and Sb–C bond lengths are 2.108(9)–2.131(12) Å and 2.090(14)– 2.21(3) Å. The structural organization of crystals 1 and 2 is controlled by intermolecular bonds O···H 2.53–2.70 Å (1) and 2.57–2.60 Å (2), F•••H 2.46–2.59 Å (1) and Br•••H 3.02 Å (2). In 2 the short contacts C··· F have been observed between the aryl ligands of neighboring molecules 3.079 and 3.085 Å. Complete tables of coordinates of atoms, bond lengths and valence angles for structures 1 and 2 are deposited at the Cambridge Structural Data Bank (no. 2055553, 2055764; depos-it@ccdc.cam.ac.uk; http: //www.ccdc.cam.ac.uk).
Application of Self-Combustion Method for Synthesis of Aluminum-Substituted Barium Hexaferrite
Authors:   South Ural State University, Chelyabinsk, Russian Federation, Chernukha A. , Zvereva A. , Zirnik G. , Mustafina K. , Pashnin D. , Dyukova О. , Malev E. , Vepreva А. , Kroshnina V. , Nekorysnova N. , Zhivulin V. , Mosunova Т. , Vinnik D.
Published: December 2023

Oxide materials have traditionally attracted the attention of researchers around the world. This is due to their wide range of applications: electrical engineering, electronics, special coatings, chemical technologies, etc. Doping of oxide materials with various elements such as Al, Bi, Zn, Co, Sn, Ti, B, Sb and others is widespread in order to fine-tune their physicochemical properties. In particular, doping of barium hexaferrite with aluminum is of particular interest, since this allows one to change such important parameters as saturation magnetization (σS), coercive force (HC), squareness coefficient of the hysteresis loop (K), as well as to influence the anisotropy field and microwave properties of the material. Since the preparation of BaAlxFe12-xO19 by the classical ceramic method requires thorough grinding of the starting materials, preliminary sintering, high temperature (above 1300 °C) and duration of the synthesis, it was decided to test an alternative method for obtaining aluminum-substituted barium hexaferrite. As such, we have chosen the self-combustion method. During the synthesis a solution of nitrates of the corresponding metals with citric acid was prepared. After neutralization and evaporation of the solution, the resulting mass was heated in a muffle furnace to carry out the spontaneous combustion process and remove residual carbon. The final sintering of samples with the composition BaAlxFe12-xO19 (for x = 0, 1, 2, and 3) was carried out in a muffle furnace with a precision temperature controller at 1100 °C for 4 hours. The obtained samples were studied by the powder diffractometry method, scanning electron microscopy, and X-ray spectral microanalysis. It has been established that the self-ignition method makes it possible to obtain homogeneous samples of barium hexaferrite substituted with aluminum at a lower temperature compared to the classical ceramic method. The parameters of the structure of the obtained samples were also determined. The tested method not only makes it possible to obtain aluminum-substituted barium hexaferrite at lower temperatures, but also makes it possible to dope ferrites with highly volatile elements.
Pollination strategies of deceptive orchids – a review
Authors: Steffelová Michaela , Traxmandlová Iva , Štípková Zuzana , Kindlmann Pavel
Published: December 2023

Orchids can be classified in terms of their pollination into rewarding species, which produce nectar in their flowers that serves as a reward for pollinators and deceptive species, whose flowers do not contain nectar and save energy for other purposes. This paper concentrates on the latter. Deceptive orchids attempt to deceive their pollinators by being similar to some non-orchid rewarding species, but not providing a reward. Each of these strategies has its advantages and disadvantages in terms of their effect on future fitness of a plant and/or population and subsequently its survival as a species. In summary, the literature indicates that deceptive strategies may lower reproductive success, but may be compensated for in that they cost less in terms of energy. This should be taken into consideration when developing management strategies for these species, which is often done by non-orchid specialists. This article is intended for such non-specialist audience and includes a description of the main types of deceptive strategies used by orchids, as well as examples of the most typical species.
Diskurzivní prostředky a profesní strategie šedé zóny poskytovatelů lékařské péče na přelomu středověku a raného novověku
Authors: Tomíček David
Published: December 2023

Socioprofesní prostředí poskytovatelů lékařské péče na přelomu středověku a raného novověku bylo charakterizováno silným pluralismem, přičemž elitní menšinu představovali univerzitě vzdělaní lékaři. Ti upevňovali svoji autoritu nad nevzdělanými léčiteli, takzvanými empiriky, jen zvolna a omezeně. Nicméně jejich neformální vliv v podobě medicínského vědění, prostředků sebeprezentace a komunikačních vzorců, to vše bylo klíčově důležité a oni sami značně ovlivňovali prostředí, které nedávné výzkumy chápe jako méně vnitřně strukturované a označuje jako "lékařskou penumbru". Tato studie se zaměřuje na neinstitucionalizované a profesionáně nejasně ohraničené skupiny empiriků, zejména šarlatánů a potulných prodejců léčiv, kouzelníků a léčitelek. Text analyzuje profesionální strategie, s jejichž pomocí v očích potenciálních uživatelů svých služeb budovali obraz své exkluzivity, a také jejich diskurzívní nástroje, jejichž prostřednictvím české prameny z období pozdního středověku a raného novověku konstruovaly narativy o těchto skupinách. Text ukazuje, jak tvůrci diskurzů o jednotlivých skupinách empiriků měnili specifické prvky svých profesionální strategií do podoby nástrojů jak delegitimizovat jejich profesionální status.
Lékařství a mužství v 19. století: nadnárodní trendy a specifika jihozápadní Evropy (Španělsko a Francie)
Authors: Martykánová Darina , Gilarranz Ainhoa , Núñez-García Víctor M.
Published: December 2023

V tom, jak se lékaři v 19. století snažili prezentovat svou profesi, hrál důležitou roli gender. Historičky a historikové lékařství poukazují na skutečnost, že se léčebné pole od raného novověku výrazně maskulinizovalo. K vypuzení žen z pozice léčebné autority přispěla profesionalizace medicíny, tedy rozšíření představy, že léčení by mělo být v rukou osob s odborným vzděláním, které za své služby berou peníze. Svou roli hrála i institucionalizace lékařství, tedy vznik nových nemocnic, veřejných postů pro lékaře a chirurgy, zakládání lékařských komor a také definitivní spojení lékařské profese s formálním odborným vzděláním. Náš autorský tým již několik let zkoumá profesní dynamiky lékařství ve Španělsku a ve Francii a srovnává je s ostatními zeměmi. Došli jsme k závěru, že zatímco gender hrál důležitou roli v lékařském profesním diskurzu a také ve veřejném obrazu lékařů tak, jak ho nalézáme v dobovém tisku, karikaturách, literatuře a jiných formách reprezentace, nedělo se tak vždy a všude stejným způsobem. Například mezi Francií, Velkou Británií a Španělskem existují značné rozdíly v tom, jakým způsobem lékaři a společnost mobilizovali genderové prvky ve snaze posílit autoritu lékařů nebo je naopak kritizovat. Rozdíly a podobnosti by se jistě daly vysledovat i ve srovnání se střední Evropou. Doufáme, že naše teoretické reflexe i praktická analýza vztahu mezi společenskou třídou, mužstvím a expertní identitou lékařů ve Francii a Španělsku 19. století budou k užitku všem.
Diabetic state of human coronary artery endothelial cells results in altered effects of bone mesenchymal stem cell‐derived extracellular vesicles
Authors: Xu Cynthia M. , Karbasiafshar Catherine , Brinck‐Teixeira Rayane , Broadwin Mark , Sellke Frank W. , Abid M. Ruhul
Published: December 2023

Human bone mesenchymal stem cell‐derived extracellular vesicles (HBMSC‐EV) have been used successfully in animal models of myocardial ischemia, yet have dampened effects in metabolic syndrome through unknown mechanisms. This study demonstrates the basal differences between non‐diabetic human coronary artery endothelial cells (HCAEC) and diabetic HCAEC (DM‐HCAEC), and how these cells respond to the treatment of HBMSC‐EV. HCAEC and DM‐HCAEC were treated with HBMSC‐EV for 6 h. Proteomics, western blot analysis, and tube formation assays were performed. Key metabolic, growth, and stress/starvation cellular responses were significantly altered in DM‐HCAEC in comparison to that of HCAEC at baseline. Proteomics demonstrated increased phosphorus metabolic process and immune pathways and decreased RNA processing and biosynthetic pathways in DM‐HCAEC. Similar to previous in vivo findings, HCAEC responded to the HBMSC‐EV with regenerative and anti‐inflammatory effects through the upregulation of multiple RNA pathways and downregulation of immune cell activation pathways. In contrast, DM‐HCAEC had a significantly diminished response to HBMSC‐EV, likely due to the baseline abnormalities in DM‐HCAEC. To achieve the full benefits of HBMSC‐EV and for a successful transition of this potential therapeutic agent to clinical studies, the abnormalities found in DM‐HCAEC will need to be further studied.
Effects of skin and mild core cooling on cognitive function in cold air in men
Authors: Wallace Phillip J. , Gagnon Dominique D. , Hartley Geoffrey L. , Taber Michael J. , Cheung Stephen S.
Published: December 2023

This study tested the effects of skin and core cooling on cognitive function in 0°C cold air. Ten males completed a randomized, repeated measures study consisting of four environmental conditions: (i) 30 min of exposure to 22°C thermoneutral air (TN), (ii) 15 min to 0°C cold air which cooled skin temperature to ~27°C (CS), (iii) 0°C cold air exposure causing mild core cooling of ∆‐0.3°C from baseline (C‐0.3°C) and (iv) 0°C cold air exposure causing mild core cooling of ∆‐0.8°C from baseline (C‐0.8°C). Cognitive function (reaction time [ms] and errors made [#]) were tested using a simple reaction test, a two–six item working memory capacity task, and vertical flanker task to assess executive function. There were no condition effects (all p > 0.05) for number of errors made on any task. There were no significant differences in reaction time relative to TN for the vertical flanker and item working memory capacity task. However, simple reaction time was slower in C‐0.3°C (297 ± 33 ms) and C‐0.8°C (296 ± 41 ms) compared to CS (267 ± 26 ms) but not TN (274 ± 38). Despite small changes in simple reaction time (~30 ms), executive function and working memory was maintained in 0°C cold air with up to ∆‐0.8°C reduction in core temperature.
Low-illumination image enhancement with logarithmic tone mapping
Authors: Du Changqing , Li Jingjian , Yuan Bin
Published: December 2023

For low-illumination video sequences, some existing enhancement algorithms have some problems, such as image over-enhancement, color distortion, and inadequate detail processing. Based on luminance detection, we add logarithmic tone mapping to optimize the existing algorithms. The color space of low-illumination video image is converted from the red, green, blue mode to the hue-saturation-intensity mode, and then, logarithmic tone enhancement is applied to the image. Algorithm in this study has an obvious effect on image luminance enhancement and details processing, which makes the low-illumination video show a clear image with more natural visual effect, thus improving the quality of low-illumination video. This algorithm can avoid the problems of overexposure, color distortion, and blurring of detail processing under low illumination. The infrared spectrum of the object can be captured by infrared detection equipment, and the purpose of image enhancement can be achieved by applying the infrared spectrum of the object.
Correlation between serum vitamin D level and uterine volume in girls with idiopathic central precocious puberty
Authors: Sun Jun , Wang Wei , Xiao Ya , Cao Niu-niu , Wang Yi-fan , Zhang Hong-ru , Jiang Shu-qin
Published: December 2023

Objectives

Investigate serum vitamin D (vit D) levels’ relation to uterine volume in idiopathic central precocious puberty (ICPP) girls and compare findings with normal peers.

Methods

Analyzed 278 ICPP cases from January 2017 to September 2022 alongside 239 normally developing girls. Collected clinical data and lab markers and performed subgroup analysis based on vit D levels. Correlation and regression analyses were conducted.

Results

The ICPP group exhibited elevated uterine volume and lower serum vit D compared to controls (p<0.05). A weak negative correlation was noted between vit D and uterine volume in ICPP (r=−0.193, p=0.004), and no such correlation in controls (r=−0.073, p=0.319). The ICPP vit D deficiency subgroup displayed higher uterine volume than the insufficiency and sufficiency subgroups (p<0.05). Uterine volume in the insufficiency subgroup exceeded the sufficiency subgroup (p<0.05). After adjusting for confounders, lower vit D is linked to increased ICPP uterine volume (non-standardized regression coefficient β=−25.55, 95 % CI= −46.23, −4.87, p=0.016). A Limited correlation between vit D and uterine volume was seen in girls with normal pubertal timing.

Conclusions

We demonstrated a correlation between vit D and uterine volume in ICPP girls, absent in normal peers. ICPP girls often exhibit lower vit D levels and increased uterine volume. Further research is vital for understanding vit D’s role in ICPP pathogenesis and guiding prevention and treatment strategies.
Oktatási és érvényesülési stratégiák a Batthyány család grófi ágán a 18. században
Authors: Zsolt Kökényesi
Published: December 2023

The focus of this paper is on the count branch of the Batthyány family, in particular Zsigmond (I.) (†1728) and his son Imre (I.) (1707–1774) and their children. Th rough the examples of two early modern fathers, we can gain an insight into the efforts of the representatives of an old aristocratic family, its side branches, to preserve their family’s position within Hungarian aristocratic society. In what follows, I will reconstruct the role of two heads of families in the assertion of their children, and I will focus in particular on the education and career development of their sons. The family’s educational strategy was based on both tradition and innovation, for example, for several generations it was common to attend Jesuit grammar schools near the family estates (Kőszeg, Sopron) and then the University of Graz, but they also tried to follow current trends, for example Zsigmond (I.) sent one of his sons to Parma and one to Salzburg to be educated, and Imre (I.) integrated the ever-expanding institutional system of the Th eresian period into his schooling strategy. Education was an important prerequisite for the careers of family members, and many of them were able to rise to the ranks of the elite, such as Adam (III) (1703/1704–1782), master of the treasury, Imre (I), incumbent of the Styrian inkolat and judge of the Table of Seven, Ignác (1741–1798), bishop of Transylvania, and József György (1737–1806), vice-president of the Court Chamber.
Contribución de las inversiones en recursos humanos según el tipo de eficiencia técnica de la banca múltiple peruana
Authors: Flores Gutiérrez José Ovidio , Castillo Inche Lucia Karin , Tejada Portilla Lourdes Belén
Published: December 2023

Se evaluó la contribución de las inversiones en recursos humanos (RRHH) a la eficiencia técnica de la banca múltiple peruana durante el 2021. Además, se demostró qué tipo de frontera de producción prevalece y se generó un plan benchmarking. A una muestra censal de 16 bancos se les midieron tres inputs (remuneraciones al personal, gastos del directorio y activos) y dos outputs (total de depósitos y total de créditos vigentes). Se identificaron siete bancos en la frontera de eficiencia técnica global (ETG), 12 bancos en la de eficiencia técnica pura (ETP) y siete bancos en la de eficiencia de escala (EE). La media de la ETG fue 0.86, la de ETP fue 0.95 y la de EE fue 0.91. Se determinó que prevalecen los rendimientos variables a escala, que la eficiencia de los bancos no varía con el nivel de inversión en recursos humanos, y se formuló un plan de mejoras potenciales.
Pre-supplementary motor cortex mediates learning transfer from perceptual to motor timing
Authors: Sánchez-Moncada Itzamná , Concha Luis , Merchant Hugo
Published: December 2023

When we intensively train a timing skill, such as learning to play the piano, we not only produce brain changes associated with task-specific learning but also improve our performance in other temporal behaviors that depend on these tuned neural resources. Since the neural basis of time learning and generalization is still unknown, we measured the changes in neural activity associated with the transfer of learning from perceptual to motor timing in a large sample of subjects (n=65; 39 women). We found that intense training in an interval discrimination task increased the acuity of time perception in a group of subjects that also exhibited learning transfer, expressed as a reduction in inter-tap interval variability during an internally driven periodic motor task. In addition, we found subjects with no learning and/or generalization effects. Notably, functional imaging showed an increase in pre-supplementary motor area and caudate-putamen activity between the post- and pre-training sessions of the tapping task. This increase was specific to the subjects that generalized their timing acuity from the perceptual to the motor context. These results emphasize the central role of the cortico-basal ganglia circuit in the generalization of timing abilities between tasks.

Significance statementIntensive training in a task can lead to improvements in other behaviors when the neural resources are shared between conditions. Hence, the learning-generalization strategy is now actively used in interventions to improve timing behaviors across tasks. Here we show that timing-precision enhancement after interval discrimination training can be transferred as a decrease in temporal variability during a tapping task in a subgroup of subjects. Crucially, the generalization from perceptual to motor timing increased activity in the pre-supplementary motor area and caudate-putamen in that subgroup. These findings support the notion that magnified recruitment occurs in the cortico-basal-ganglia circuit when an acquired perceptual-timing ability is transferred to a motor-timing task.
Projekt sustavnog terenskog pregleda neolitičkog nalazišta Graduša – Lokve
Authors: Horvat Oštrić Kristina
Published: December 2023

S nalazištem srednjeg i kasnog neolitika Graduša – Lokve u Islamu Grčkom (sjeverna Dalmacija) povezano je mnogo otvorenih pitanja. Veličina i granice nalazišta, međusobni prostorni, stratigrafski i kulturni odnosi između naselja srednjeg i kasnog neolitika, te korelacija distribucije površinskih nalaza s objektima iz neolitičkog naselja koji se mogu prepoznati na površini, samo su neka od njih. Kako bi se dali odgovori na neka od navedenih pitanja, proveden je sustavan terenski pregled tijekom veljače 2023. godine. Rezultati istraživanja pridonose boljem poznavanju nalazišta, te će služiti kao podloga u planiranju budućih istraživanja na nalazištu.
An instructional account for «on the contrary» based on studies on counterargumentative connectors
Authors: Murillo Ornat Silvia
Published: December 2023

The aim of this paper is to contribute to the pragmalinguistic explanation of the English discourse marker on the contrary applying the instructional framework developed by Portolés (2001) for Spanish discourse markers. In order to account for the procedural meaning of this marker, particular attention is paid to his descriptions of the counterargumentative connectors por el contrario, en cambio and al contrario, and to the development of polyphonic instructions (Ducrot 1980, Portolés 2011, Murillo 2016). In the current proposal, on the contrary encodes counterargumentive, informative, and polyphonic instructions, and the main polyphonic configurations are presented and exemplified. A comparison between on the contrary, por el contrario and al contrario is subsequently offered, and some issues for translation are addressed.
Empleos interjectivos y discursivos de la partícula «ojito»
Authors: Hernández Patricia Carmen
Published: December 2023

Este trabajo presenta un estudio de la partícula ojito. Generalmente empleada como interjección, esta forma aparece, en determinados contextos, con valores que se aproximan a los de un marcador discursivo. Los objetivos de esta investigación son (i) describir su comportamiento semántico-pragmático y (ii) caracterizar sus usos interjectivos así como sus usos discursivos dentro de un continuum. Enmarcado en la lingüística cognitiva, nuestro trabajo integra conceptos como el de prototipicidad, gramática emergente y gramaticalización. Sobre la base de ocurrencias extraídas de corpus en línea, se realiza un análisis cualitativo que nos permite llegar a las siguientes conclusiones: la partícula puede marcar (i) refuerzo enfático, (ii) llamado de atención, (iii) advertencia. En sus usos prototípicamente interjectivos, ojito puede constituir un enunciado exclamativo independiente con marcas ortográficas de exclamación mientras que, en sus empleos discursivos, se integra a enunciados no exclamativos, con mayor plasticidad posicional y, por su valor exclusivamente procedimental, resulta prescindible.
Context and coordination in discourse
Authors: Garrido Joaquín
Published: December 2023

Sentences including their deictic information are elementary discourse units linked in constituent structures. They are bound to information from their discourse contexts, and their linking produces rhetorical effects. Discourse is a sequence of linked sentences bound to their discourse contexts. Each sentence or elementary discourse unit is linked to others by means of the information it requires to be interpreted, obtained from its discourse context and its deictic information. Discourse context is the source for the additional information needed for the linking of discourse units and their interpretation in discourse constituent structures, producing the intended intentional rhetorical effects in texts. Subordination in discourse relations between units is analyzed in terms of their topics and frames. Coordination with sentence-initial and has subordination-to-the-left properties in the discourse constituent structure. These properties of discourse coordination, including focus and wider scope, are shown to be effective tools to build and organize, by means of discourse coordination, complex discourse units that represent rhetorical moves in texts.
Las pausas en torno al marcador discursivo «pues» en secuencias narrativas en español
Authors: Méndez Guerrero Beatriz
Published: December 2023

La influencia de la prosodia en la realización e interpretación de los marcadores discursivos es un hecho que nadie cuestiona. Sin embargo, a pesar de reconocerse su importancia, todavía no se sabe con detalle el papel que desempeñan los rasgos prosódicos en la producción e inferencia de estos elementos discursivos. En esta investigación, se presenta un análisis en torno a las pausas que aparecen junto al marcador discursivo pues comentador en las narraciones registradas en el corpus PRESEEA-Alcalá. Los resultados del estudio sugieren que existe una frontera prosódica significativa previa al marcador, marcada por pausa media, cuando pues se utiliza con el valor narrativo; y que también es posible encontrar pausas, aunque más breves, en otras posiciones como la pospuesta o la circundante.
El hablar y los participantes en la interacción comunicativa: cuando el interlocutor es artificial
Authors: Domínguez García María Noemí
Published: December 2023

La proliferación, en los últimos años, de los modelos de lenguaje impulsados por las investigaciones en inteligencia artificial ha hecho que lingüistas de todas las disciplinas se interesen por estudiar las estrategias de estos modelos para generar un lenguaje que imita al de los seres humanos. El objeto de este trabajo es el estudio de la interacción con uno de estos modelos de lenguaje artificial, en concreto de ChatGPT-3. Para ello, se ha analizado un corpus de seis textos que contienen interacciones completas entre un interlocutor humano y este modelo de lenguaje. Se han segmentado los textos tomando como unidad básica de análisis la intervención, en el nivel monologal, y el intercambio, en el nivel dialogal (Briz 2000; Grupo Val.Es.Co. 2014; Pons 2022). También se ha analizado su superestructura, tomando como unidad base la secuencia (Werlich 1975; Adam 1992; Roulet 1991) y, así, poder determinar cuáles son los tipos de texto que pueden observarse en el corpus de referencia
Des(a)nude mi cuerpo. Un ensayo etnográfico sobre la práctica social del nude y su relación con la mirada masculina
Authors: García Domínguez Manuel , Claver Barrios Gadea
Published: December 2023

El envío de imágenes pornográficas a través de redes sociales constituye una de las experiencias más comunes dentro de los nativos digitales, formando parte del argot digital términos como nude o pack. Los nudes están estrechamente relacionados con la cuestión de género desde el planteamiento del mismo como sexualización de la ritualización asociada a la socialización femenina, así como por la habitual circulación de los mismos en redes masculinas. Sin embargo, los análisis sobre el nude tienden a evadir una cuestión central: la mirada masculina, tanto individual como colectiva. Por ello, a través de una línea argumentativa fruto de una revisión bibliográfica y de una serie de entrevistas semiestructuradas a mujeres cis sáficas, trataremos de dar cuenta de la implicación entre la mirada masculina y los llamados nudes, así como la función de tales nudes como uno de los ejes fundamentales en la experiencia corporal de estas mujeres cis. Para ello, en una primera sección, haremos una crítica al monopolio de la vigilancia maquínica en los estudios digitales anglosajones señalando una forma de vigilancia del ecosistema digital poco estudiada: la vigilancia encarnada de la mirada masculina. Posteriormente, se estudiará la relación que tiene esta mirada masculina con la constitución de los desnudos en redes semi-privadas partiendo de los estudios cinematográficos de Laura Mulvey. Por último, recuperando la línea teórica mencionada, se hará un acercamiento comparativo a varias participantes respecto a su experiencia corporal. A la luz de la perspectiva social interaccionista de Goffman y diversos estudios sociales como la antropología del cuerpo, trataremos de comprender cómo se construye la mirada masculina en los cuerpos de las entrevistadas, así como el contraste experiencial de las mismas en los márgenes de esta “mirada” dentro de relaciones fuera de la heteronormatividad.
Pornografía en Chile: ausencia del Estado y promoción del mercado. Breve reflexión desde un feminismo crítico
Authors: Santana Nazarit Paula
Published: December 2023

El presente escrito comparte una reflexión sobre la circulación de la pornografía en el espacio público, su impacto en la vida y sexualidad de las mujeres y los aportes teórico políticos provenientes de un feminismo que problematiza la pornografía como violencia estructural. Se toma como referencia situada a Chile, país que, como muchos otros de la región latinoamericana, ostenta alto consumo pornográfico y una ambigüedad estatal histórica en este tema, siendo objeto de preocupación recientemente sólo por el riesgo que supone para niñas y niños, mientras, que al mismo tiempo, la pornografía se promueve y tolera a través del mercado y los medios de comunicación. El presente escrito es un ensayo, que reúne algunos antecedentes actuales de la pornografía en Chile, que se complementan con aportes teóricos del feminismo y de la autora, con la pretensión de actualizar un debate prácticamente inexistente en el feminismo chileno y motivar al posicionamiento frente a este problema social que afecta de manera particular a las niñas y a las mujeres.
Estructura latente e invarianza factorial del Cuestionario de regulación emocional cognitiva en escolares peruanos
Authors: Barrios Sallo Zoraida , Caycho Caja Aaron
Published: December 2023

Se identificó la estructura latente y la invarianza factorial del CERQ. Para lo cual se estudió una muestra de 430 escolares peruanos de cinco instituciones estatales de Lima (Perú). Se realizó un análisis factorial confirmatorio del instrumento y se analizó la consistencia interna de cada dimensión. Luego, se planteó la hipótesis de invarianza factorial de la versión final según el género de los participantes. Los resultados señalan una estructura latente de nueve factores, de los cuales la versión propuesta mostró una bondad de ajuste favorable (RMSEA = 065, SRMR = .069, CFI = .917, GFI = .972, NFI = .949) con coeficientes de consistencia interna entre buenos y aceptables. Asimismo, desde el enfoque AFCMG, se obtuvo evidencia para la invarianza factorial débil, fuerte y estricta. Se concluye que El CERQ cuenta con una estructura latente definida y se puede emplear tanto en hombres como mujeres.
On the mean square of the periodic zeta-function
Authors: Kačėnas Audrius , Šiaučiūnas Darius
Published: December 2023

There is not abstract.
Zeta functions of cusp forms
Authors: Laurinčikas Antanas
Published: December 2023

There is not abstract.
Geometry of nonholonomic complexes NGr(1, 4, 4)
Authors: Navickis Kazimieras
Published: December 2023

In  this  article  intrinsic  normalizations  of a nonholonomic complexes NGr( 1, 4, 4) in projective space P4 is constructed in an invariant form.
Automatization of proof-search for a fragment of the first-order linear tense logic
Authors: Alonderis Romas
Published: December 2023

There is not abstract.
Statistical distributions of thesauri and their uses in classification of science publications
Authors: Balys Vaidas , Rudzkis Rimantas
Published: December 2023

Automatic keywords assignment is a way to solve the problem of classification of scientific information. Paper deals with idea of implementing this assignement by making use of models for distribution of scientific terms. Some analysis was carried out and on base of its results the conclusions about effectiveness, usefullnes, main shortages and the ways of refinement of simpliest algorithms are drawn. A need for better algorithms is motivated and some ideas about how to create them are proposed.
Tax revenue econometric estimation
Authors: Mačiulaitytė Elena , Rudzkis Rimantas
Published: December 2023

National budget tax revenue in relation with economic changes in Lithuania in 1995–2002 is analyzed in this article. There is also analyzed value added tax (VAT) as it brings the biggest share of Lithuanian National budget and economic factors that influence VAT revenue. Time series models of relational indicators of tax revenue are presented in this paper. Results of statistic hypotheses presented here reflect a quality and tendency of collection of VAT and tax revenue as a whole in different periods of time considering the economic situation in the country.
Optimal estimate of the convergence rate of statistic ρN = |ZNWN|
Authors: Vilkas Robertas , Aksomaitis Algimantas
Published: December 2023

The optimal estimate of the convergence rate of distribution function of statistic ρN is given (for one of the examples in [1]) and unimprovable constants were obtained. Besides, the optimal non-uniform estimate from the right was found together with the unimprovable constant.
Modify possibilities of the secondary structures prediction method
Authors: Špokas Alvydas , Timinskas Albertas
Published: December 2023

It was analyzed dependence of the average accuracy of secondary protein structure prediction on various GOR algorithm modifications. In essence new modification has expanded informational parameter set by taking into account secondary structure of neighboring amino acid. The accuracy of the method with this modification increases almost for 1 percent. This increase in accuracy is quite significant, as the amount of informational parameters increases not much.
Estimation of parameters in ageing model using Bayesian approach
Authors: Augutis Juozas , Žutautaitė Inga , Augutienė Elvyra
Published: December 2023

There is not abstract.
Models for estimating the efficiencies of forest enterprises
Authors: Kaminskienė Janina , Laurinavičius Eligijus
Published: December 2023

A data envelopment analysis (DEA) application in evaluating the efficiency is presented. The models for estimating productive and resource efficiencies of forest enterprises are used.
Generalized product-sum variogram models of the data of the Center of Marine Research
Authors: Krūminienė Ingrida , Dučinskas Kęstutis
Published: December 2023

Environmental data usually depends on both spatial and temporal components. Therefore, it is essential to have statistical models to describe how the data vary across space and time. Structural analysis begins with estimating the space-time covariance or variogram. In this paper a generalised product-sum variogram models has been fitted to the data of the Center of Marine Research by making use of Gstat software.