bluuebunny/crossref_metadata_2025_split huggingface dataset:
On Fejér-type inequalities for generalized trigonometrically and hyperbolic k-convex functions
Authors: Dragomir Silvestru Sever , Jleli Mohamed , Samet Bessem 
Published: June 2024

Abstract
For

μ
∈

C

1

(

I

)

\mu \in {C}^{1}\left(I)

,

μ
>
0

\mu \gt 0

, and

λ
∈
C

(

I

)

\lambda \in C\left(I)

, where

I

I

is an open interval of

R

{\mathbb{R}}

, we consider the set of functions

f
∈

C

2

(

I

)

f\in {C}^{2}\left(I)

satisfying the second-order differential inequality

d

d
t

μ

d
f

d
t

+
λ
f
≥
0

\frac{{\rm{d}}}{{\rm{d}}t}\left(\phantom{\rule[-0.75em]{}{0ex}},\mu \frac{{\rm{d}}f}{{\rm{d}}t}\right)+\lambda f\ge 0

in

I

I

. The considered set includes several classes of generalized convex functions from the literature. In particular, if

μ
≡
1

\mu \equiv 1

and

λ
=

k

2

\lambda ={k}^{2}

,

k
>
0

k\gt 0

, we obtain the class of trigonometrically

k

k

-convex functions, while if

μ
≡
1

\mu \equiv 1

and

λ
=
−

k

2

\lambda =-{k}^{2}

,

k
>
0

k\gt 0

, we obtain the class of hyperbolic

k

k

-convex functions. In this article, we establish a Fejér-type inequality for the introduced set of functions without any symmetry condition imposed on the weight function and discuss some special cases of weight functions. Moreover, we provide characterizations of the classes of trigonometrically and hyperbolic

k

k

-convex functions.
Invariant means and lacunary sequence spaces of order (α, β)
Authors: Ayman-Mursaleen Mohammad , Nasiruzzaman Md. , Sharma Sunil K. , Cai Qing-Bo 
Published: June 2024

Abstract
In this article, we use the notion of lacunary statistical convergence of order

(

α
,
β

)

\left(\alpha ,\beta )

to introduce new sequence spaces by lacunary sequence, invariant means defined by Musielak-Orlicz function

ℳ
=

(

ℵ

k

)

{\mathcal{ {\mathcal M} }}=\left({\aleph }_{k})

. We also examine some topological properties and prove inclusion relations between newly constructed sequence spaces.
Molecular landscape of borderline ovarian tumours: A systematic review
Authors: Sadlecki Pawel , Walentowicz-Sadlecka Malgorzata 
Published: June 2024

Abstract
Borderline ovarian tumours (BOTs) show intriguing characteristics distinguishing them from other ovarian tumours. The aim of the systematic review was to analyse the spectrum of molecular changes found in BOTs and discuss their significance in the context of the overall therapeutic approach. The systematic review included articles published between 2000 and 2023 in the databases: PubMed, EMBASE, and Cochrane. After a detailed analysis of the available publications, we qualified for the systematic review: 28 publications on proto-oncogenes: BRAF, KRAS, NRAS, ERBB2, and PIK3CA, 20 publications on tumour suppressor genes: BRCA1/2, ARID1A, CHEK2, PTEN, 4 on adhesion molecules: CADM1, 8 on proteins: B-catenin, claudin-1, and 5 on glycoproteins: E-Cadherin. In addition, in the further part of the systematic review, we included eight publications on microsatellite instability and three describing loss of heterozygosity in BOT. Molecular changes found in BOTs can vary on a case-by-case basis, identifying carcinogenic mutations through molecular analysis and developing targeted therapies represent significant advancements in the diagnosis and treatment of ovarian malignancies. Molecular studies have contributed significantly to our understanding of BOT pathogenesis, but substantial research is still required to elucidate the relationship between ovarian neoplasms and extraneous disease, identify accurate prognostic indicators, and develop targeted therapeutic approaches.
Advances in processing and ablation properties of carbon fiber reinforced ultra-high temperature ceramic composites
Authors: Zhu Tanglong , Wang Zhen 
Published: June 2024

Abstract
With the continuous development of hypersonic vehicles, higher demands are being placed on all aspects of the performance of thermal protection materials. Carbon fiber reinforced ultra-high temperature ceramics composites (Cf/UHTCMC) have an extremely bright prospect as thermal structures and anti-ablation components of hypersonic vehicles and rockets, by reason of their superior thermal shock, oxidation and ablation properties, high fracture toughness, and damage tolerance. However, due to the complicated fabrication process and harsh service environment of Cf/UHTCMC, there are still some pivotal scientific issues that need to be clarified on structural evolution and performance mechanisms. The aim of this work is to review the latest research progress in processing methods, matrix modification, oxidation ablation mechanism, structure, and property regulation as well as elevated temperature mechanical properties of Cf/UHTCMC, summary, and prospect of the future research trend of Cf/UHTCMC, to provide reference for further promoting the improvement and development of Cf/UHTCMC.
Plankton and contour algal communities in the ukrainian section of the Western Bug River and its tributaries
Authors: Shcherbak V.I. , Semeniuk N.Ye. , Davydov O.A. , Koziychuk E.Sh. 
Published: June 2024

The taxonomic diversity of algae in the Western Bug River and its tributaries during the low-water summer-autumn season comprised 303 species (318 intraspecies taxa, ist) from 131 genera, 74 families, 45 orders, 16 classes and 8 phyla. Bacillariophyta dominated, Chlorophyta were recorded as subdominants. The phytoplankton taxonomic diversity included 140 ist, microphytobenthos – 191, phytoperiphyton – 172. The floristic nucleus of algal communities was formed by 17 families. In phytoplankton the highest rank belonged to Scenedesmaceae, while in contour algal communities – Naviculaceae. The highest floristic similarity was observed for microphytobenthos and phytoperiphyton, and the highest dissimilarity – for phytoplankton and phytoperiphyton. The spatial differentiation between contour and plankton communities during the low-water period, rather high similarity of their floristic structure indicate the unity of structural organization of algae from different ecological groups as an important component of biodiversity in the transboundary rivers. According to geographic distribution cosmopolites dominated; according to flow and oxygen regime – indifferents; according to pH preference – alkaliphilic and indifferent species; according to salinity preference – indifferent species; according to saprobiological characteristics – χ-ο- and β-mesosaprobic species. According to biotopic preference eurytopic and benthic forms prevailed. The dialectic unity between contour algal communities and phytoplankton to a great extent depends on morphometric and hydrological characteristics of the rivers under study. High taxonomic diversity, clearly marked spatial differentiation between planktonic and contour communities, interesting species of Bacillariophyta – all these features are indicative of the uniqueness and importance of algae in forming the biodiversity of the transboundary Western Bug River and its tributaries as the components of the EU hydrological network.
P2Y2R and Cyst Growth in Polycystic Kidney Disease
Authors: Kraus Andre , Skoczynski Kathrin , Brötsch Martin , Burzlaff Nicolai , Leipziger Jens , Schiffer Mario , Büttner-Herold Maike , Buchholz Bjoern 
Published: June 2024

Key Points

Polycystic kidney disease (PKD) is characterized by continuous cyst growth, which results in a decline in kidney function.Deletion of P2Y2R and pharmacological antagonism of purinergic signaling significantly reduced cyst growth in an orthologous PKD mouse model.P2Y2R was expressed in cysts of human PKD nephrectomies, which makes P2Y2R a reasonable target for treatment of PKD.

Background
Autosomal dominant polycystic kidney disease (ADPKD) is characterized by multiple bilateral kidney cysts that gradually enlarge, resulting in a decline in kidney function. Cyst growth is significantly driven by ATP-dependent chloride secretion mediated by the ion channel TMEM16A. This pathway is further augmented in advanced stages of the disease by hypoxia and activation of hypoxia-inducible factor (HIF)-1α. The mechanisms by which ATP leads to activation of TMEM16A and how HIF-1α contributes to cyst growth in vivo have remained elusive.

Methods
Mice with an inducible tubule-specific deletion of Pkd1 were compared with mice with an additional codeletion of the purinergic receptor P2y2r. Furthermore, animals were challenged by pharmacological activation of HIF-1α and Pkd1-deficient mice were treated with suramin, an antagonist of purinergic signaling. In addition, expression of P2Y2R, TMEM16A, and HIF-1α was analyzed in nephrectomy samples from 27 patients with ADPKD.

Results
Genetic deletion of P2y2r significantly inhibited cyst growth in vivo. In addition, aggravation of the polycystic phenotype mediated by pharmacological activation of HIF-1α was reduced by deletion of P2y2r. Application of suramin to pharmacologically inhibit purinergic signaling also suppressed cyst enlargement in vivo. Analysis of kidney samples from 27 patients with ADPKD revealed significant expression of P2Y2R at the luminal site of the cyst-lining epithelium.

Conclusions
P2Y2R was significantly expressed in human and mouse polycystic kidneys. Deletion and antagonism of P2Y2R reduced cyst enlargement in an ADPKD mouse model.
Glomerular Endothelial Cell Receptor Adhesion G-Protein–Coupled Receptor F5 (ADGRF5) and the Integrity of the Glomerular Filtration Barrier
Authors: Nagase Miki , Ando Hikaru , Beppu Yoshiaki , Kurihara Hidetake , Oki Souta , Kubo Fumimasa , Yamamoto Kazuki , Nagase Takashi , Kaname Shinya , Akimoto Yoshihiro , Fukuhara Hiroshi , Sakai Tatsuo , Hirose Shigehisa , Nakamura Nobuhiro 
Published: June 2024

Key Points

Deletion of endothelial receptor adhesion G-protein–coupled receptor F5 in mice led to abnormal structural and functional properties of the glomerular filtration barrier.Adhesion G-protein–coupled receptor F5 regulates gene expression of glomerular basement membrane components and a mechanosensitive transcription factor.

Background
Glomerular endothelial cells are recognized to be important for maintaining the glomerular filtration barrier. Adhesion G-protein–coupled receptor F5 (ADGRF5), an adhesion G protein–coupled receptor, has been suggested to be involved in endothelial cell function. However, the role of ADGRF5 in the glomerular filtration barrier integrity remains elusive.

Methods
Cellular expression of ADGRF5 in mouse glomerulus was determined by histological analyses. The effect of ADGRF5 deletion on the glomerular morphology, kidney function, and glomerular endothelial gene/protein expression was then analyzed using ADGRF5 knockout (Adgrf5
−/−) mice and human primary glomerular endothelial cells.

Results
ADGRF5 was specifically expressed in the capillary endothelial cells within the glomerulus. Adgrf5
−/− mice developed albuminuria and impaired kidney function with morphological defects in the glomeruli, namely glomerular hypertrophy, glomerular basement membrane splitting and thickening, diaphragmed fenestration and detachment of the glomerular endothelial cells, and mesangial interposition. These defects were accompanied by the altered expression of genes responsible for glomerular basement membrane organization (type 4 collagens and laminins) and Krüppel-like factor 2 (Klf2) in glomerular endothelial cells. Moreover, ADGRF5 knockdown decreased COL4A3 and COL4A4 expression and increased KLF2 expression in human primary glomerular endothelial cells.

Conclusions
The loss of ADGRF5 resulted in altered gene expression in glomerular endothelial cells and perturbed the structure and permselectivity of the glomerular filtration barrier.
Phase relations in the Si–Sn–As system
Authors: Sushkova Tatiana P. , Semenova Galina V. , Proskurina Elena Yu. 
Published: June 2024

The goal of this work was to study phase relations in the ternary Si–Sn–As system: to establish cross sections, to construct a scheme of phase equilibria, and to identify the temperature of non-variant transformations. Ternary alloys were obtained through direct synthesis from simple substances and subjected to long-term solid-phase annealing. Alloys of four polythermal sections of the Si–Sn–As system were examined using X-ray phase and differential thermal analysis. The results of X-ray powder diffraction allowed establishing that the phase subsolidus demarcations was performed by the SnAs–SiAs2, SnAs–SiAs, Sn4As3–SiAs, and Sn4As3–Si sections. As a result of the experiment, taking into account the theoretical analysis, we suggested a scheme of phase equilibria in the system that involved the implementation of eutectic and four peritectic invariant equilibria, and we used differential thermal analysis to determine the temperature of these four-phase transformations. It was found that extended solid solutions were not formed in the system, and only a substitutional solid solution at least 3 mol % wide was formed based along the SnAs–SiAs2 section based on tin monoarsenide
Biocatalysts based on complexes of carbon nanomaterials with cysteine proteases
Authors: Goncharova Svetlana S. , Shchegolevatykh Ekaterina A. , Zhukalin Dmitry A. , Holyavka Marina G. , Artyukhov Valery G. 
Published: June 2024

The purpose of the research is to develop and study biocatalysts based on complexes of cysteine proteases with fullerenes and carbon nanotubes. During the formation of ficin complexes with fullerenes and carbon nanotubes, the activity of hybrid preparations was 70 and 45%, respectively. During the formation of papain complexes with fullerenes and carbon nanotubes, the proteolytic ability of the enzyme remained at the same level for the samples with fullerene and decreased by 27% for the preparations with carbon nanotubes. The formation of bromelain complexes with fullerenes and carbon nanotubes contributed to a decrease in the proteolytic activity of the biocatalyst by 18 and 48% as compared to the free enzyme. While determining the stability of complexes of nanomaterials and cysteine proteases during a 7-day incubation in 0.05 M tris-HCl buffer (pH 7.5) at 37 °C, we noticed a decrease in the proteolytic activity of the samples. Complexation with carbon nanoparticles and fullerenes increased the stability of ficin and bromelain, while the stability of papain in the complexes remained unchanged
Structure and composition of a composite of porous silicon with deposited copper
Authors: Lenshin Alexander S. , Kim Kseniya B. , Agapov Boris L. , Kashkarov Vladimir M. , Lukin Anatoly N. , Niftaliyev Sabukhi I. 
Published: June 2024

Porous silicon is a promising nanomaterial for optoelectronics and sensorics, as it has a large specific surface area and is photoluminescent under visible light. The deposition of copper particles on the surface of porous silicon will greatly expand the range of applications of the resulting nanocomposites. Copper was chosen due to its low electrical resistivity and high resistance to electromigration compared to other metals. The purpose of this research was to study changes in the structure and composition of porous silicon after the chemical deposition of copper. Porous silicon was obtained by the anodisation of monocrystalline silicon wafers KEF (100) (electronic-grade phosphorus-doped silicon) with an electrical resistivity of 0.2 Ohm·cm. An HF solution in isopropyl alcohol with the addition of H2O2 solution was used to etch the silicon wafers. The porosity of the samples was about 70 %. The porous silicon samples were immersed in copper sulphate solution (CuSO4·5H2O) for 7 days. We used scanning electron microscopy, IR spectroscopy, and ultrasoft X-ray emission spectroscopy to obtain data on the morphology and composition of the initial sample and the sample with deposited copper. The chemical deposition of copper on porous silicon showed a significant distortion of the pore shape as well as the formation of large cavities inside the porous layer. However, in the lower part the pore morphology remained the same as in the original sample. It was found that the chemical deposition of copper on porous silicon leads to copper penetrating into the porous layer, the formation of a composite structure, and it prevents the oxidation of the porous layer during storage. Thus, it was demonstrated that the chemical deposition of copper on a porous silicon surface leads to visible changes in the surface morphology and composition. Therefore, it should have a significant impact on the catalytic, electrical, and optical properties of the material.
Sedimentation of bentonite suspensions under the influence of low molecular weight polymers based on amino ester salts
Authors: Vandyshev Dmitriy Yu. , Sleptsova Olga V. , Gazin Vladislav Yu. , Malyutin Stanislav A. , Malkin Naum R. , Shikhaliev Khidmet S. 
Published: June 2024

Among the available technologies for treating natural and wastewater from clay materials, coagulation/flocculation is the most common method due to its high efficiency, simplicity, and cost-effectiveness. Inorganic coagulants such as aluminum sulfate and ferric chloride, widely used as destabilizing agents for colloidal particles, have several significant drawbacks: low efficiency and toxicity. Organic reagents of both natural and synthetic origin are a good alternative. This work is devoted to the evaluation of the flocculation action of new reagents, which are low molecular weight polymers based on amino ester salts on clay suspensions, as well as the selection of their optimal concentration, providing the maximum sedimentation rate. Studies have shown that amino ester salts can be effectively used for the treatment of water-clay suspensions. An important factor is the nature of the anion used, which has a significant influence on the oagulation ability of esters. Thus, 40–50 % (wt.) aqueous solutions of amino ester chlorides added to clay suspensions in an amount not exceeding 0.1% (vol.) can be used to thicken clay suspensions. At the same time, aqueous solutions of amino ester bromides regardless of the concentration, introduced into bentonite suspensions of 0.1–0.4 % (vol.), contribute to improved sedimentation, reducing viscosity, and increasing filtration capacity. These results allow us to recommend the use of amino ester chlorides as athickener in the preparation of drilling muds for strengthening the walls of wells during drilling, and bromides – for flocculation of bentonite suspensions in oil production
Crystallization features and physical properties of the thin-film heterostructure of lead zirconate titanate – lead oxide
Authors: Pronin Igor P. , Kaptelov Evgeny Yu. , Gushchina Ekaterina V. , Senkevich Stanislav V. , Pronin Vladimir P. , Ryzhov Igor I. , Ugolkov Valerii L. , Sergeeva Olga N. 
Published: June 2024

Various diagnostic techniques aimed at studying the structure and physical properties (synchronous thermal analysis, atomic force microscopy operating in the current measurement mode, electron-probe X-ray spectral microanalysis, dynamic method for determining the pyroelectric response) were used to study the crystallization features and physical properties of the thin-film heterostructure PZT – PbO1+x formed by a two-stage technique of RF magnetron sputtering of a ceramic target. During the first stage, amorphous films were deposited on a “cold” platinized silicon substrate, while the second stage involved high-temperature annealing in air. It was shown that annealing of amorphous films and crystallization of the intermediate pyrochlore phase are accompanied by additional oxidation of the structure resulting in the formation of lead orthoplumbate and lead dioxide and additional oxidation of organic inclusions. The presence of a liquid phase of lead oxide contributes to the formation of the pyrochlore phase. It was found that lead oxide layers have significantly higher through conductivity than perovskite blocks. It was assumed that the increased conductivity of lead oxide layers is associated with lead dioxide, which has high conductive properties. Self-polarized thin films were detected to have an abnormal electrical response to the strobing thermal exposure, including the typical pyroelectric response, local photoconductivity shunted by layers of the perovskite phase, and through photoconductivity. The presence of photoconductivity is also associated with the conductive properties of lead dioxide
A study of gallium oxide by using the piezoelectric composite oscillator technique at a frequency of 100 kHz
Authors: Kaminskii Vladimir V. , Kalganov Dmitrii A. , Panov Dmitrii I. , Spiridonov Vladislav A. , Ivanov Andrey I. , Rozaeva Margarita V. , Bauman Dmitrii A. , Romanov Alexey E. 
Published: June 2024

The article presents the results of the study of the mechanical properties and defect structure of gallium oxide (Ga2O3) by using the piezoelectric composite oscillator technique. Bulk samples of the Ga2O3 beta phase in the form of single crystals and their intergrowths were obtained by growth from a melt with a shaper (Stepanov technique). The research involved studying the dependences of the longitudinal elastic modulus and the damping of elastic vibrations at a frequency of 100 kHz on the strain amplitude. Changes in the elastic and microplastic properties of the samples at different temperatures were attributed to possible relaxation phenomena in the structure of the material. Studying the defect structure in samples of pure and doped Ga2O3 is necessary to improve the technology for the production of large single crystals. The fundamental questions in this area are the influence of defects on the anisotropy of electrical conductivity, band structure, and other functional properties of the resulting semiconductor material. The purpose of this article is to establish the features of sample preparation, research, and interpretation of the results obtained by the piezoelectric composite oscillator technique for gallium oxide samples. In the studied samples, the first longitudinal vibration mode was excited, which corresponded to a length of about 27 mm and a small cross-section of the sample. The temperature dependences in the region of low and high strain amplitudes were determined separately. The crystalline quality of the prepared samples was assessed by X-ray diffraction with the analysis of the rocking curve. The value of Young’s modulus obtained along the growth axis (crystalline orientation <010>) in Ga2O3 crystals E≈260 GPa is in line with the results of previous studies. Relaxation peaks corresponding to various dislocation interactions were found on the temperature dependences of internal friction at a temperature of 280 K
National interests as the basis of statehood
Authors: Selyukov A. D. 
Published: June 2024

The article shows that in the context of attempts by Russian society to overcome the crisis, the main role is assigned to the state. The state, adopting the method of carrying out transformations «from above», set the task of reviving national values, strengthening the unity of the entire society in the space of the state, activating economic growth based on widespread innovation, increasing the role of national culture and national spirit.The author justifiably shows that the form of goal-setting of the state’s activities for the implementation of state-building tasks is a guideline for achieving national interests as an integral installation in terms of importance and range of realized values, reflecting the deep strategic interests of the majority of society. At the same time, the mission of the state itself acts as an indicator of the degree of realization of national interests.The author has shown that the defining role for the proper qualification of the interests of the state as the basic concept of this study is played by the concept of «public interest» as opposed to other groups of interests that can be summarized in the concept of «private interests».