bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development of logical thinking of high school students through a problem-based approach to teaching mathematics
Authors: Lovianova I V , Yu Kaluhin R , Kovalenko D A , Rovenska O G , Krasnoshchok A V 
Published: June 2022

Abstract
This article considers the search for new methodological approaches to teaching high school students mathematics that will promote the development of their logical thinking. Based on the analysis conducted by the authors of the study identified an urgent need to develop the logical thinking of students in mathematics lessons through various methods of solving problems. The authors of the article set out to investigate the factors that will ensure the implementation of a problem-based approach to teaching mathematics. These factors include the choice of a certain type of mathematical problem; selection of a method for solving mathematical problems; compiling a system of problems of one type that require the selection of methods for solving them. The authors reveal the introduction of the problem approach as a method of developing students’ logical thinking in the article on the example of solving irrational equations with parameters. The authors of the study explain the value of problems with parameters by the fact that the process of solving them contributes to the formation of students’ research skills. In the study, the authors focused on the analytical method of solving problems with parameters. Structural analysis of problems allowed the authors to formulate the following didactic requirements for the system of mathematical problems such as compliance with the problems of the course content and the principle of gradual increase in complexity; the rational relationship between the logical and heuristic components of educational activities; the presence of ideological and technical complexity, etc. To confirm the effectiveness of the introduction of the problem-based approach to the educational process, as a method of developing students’ logical thinking, an experiment was conducted. The main objectives of the experiment were to identify the level of logical thinking of students; development and implementation in the educational process of a system of problems with parameters in the study of the topic “Irrational equations”, which contribute to the development of logical thinking of students; analysis of the results of the experiment. The obtained results and their statistical processing confirmed significant differences in the levels of development of logical thinking in the control and experimental groups, respectively. This proved the effectiveness of a problem-based approach to teaching mathematics and the development of logical thinking of students.
Mathematical competence and mathematical abilities: structural relations and development methodology
Authors: Semenets S P , Semenets L M , Andriichuk N M , Lutsyk O M 
Published: June 2022

Abstract
In the presented work, the concept of mathematical abilities is rational as both an essential internal characteristic of mathematical competence and an immanent attribute that prevails in its personal and psychological dimension. In view of the spatial Cartesian implementation the role and place of mathematical abilities in the three-dimensional structure of the internal manifestation of mathematical competence are substantiated. The semantic and system analysis of structural components of the studied phenomenon is made. It is established that complex correlations of four structural components of mathematical abilities (system-forming, coding-formalized, cognitive-generalizing, mnemonic-generalizing) can exist with three dimensions of the external manifestation of mathematical competence (semantic-theoretical, procedural-active, personal-psychological). It is introduced that the development of mathematical abilities is provided by updating the external dimensions of mathematical competence in educational and mathematical activities. The method of developing the mathematical abilities of students is presented according to the results of the implementation of this idea and the principle of developmental continuity. The basis of this technique is the developmental-problem method of teaching mathematics as a four-level problem structure which embodies the methods of mathematical and educational (educational-theoretical) modeling, the method of ascent from the abstract to the concrete, provides a reflection of the process and results of educational and mathematical activities. Due to the problem raised in the work the authors highlight the content and results of a pilot study on the development of mathematical abilities of future mathematics teachers (freshmen and graduates). The effectiveness of the created developmental methods of mathematical education was experimentally tested.
Personal e-Learning Environment of the Maths teacher’ online course as a means of improving ICT competency of a Mathematics teacher
Authors: Vlasenko K V , Chumak O O , Lovianova I V , Achkan V V , Sitak I V 
Published: June 2022

AbstractThe paper studies the issue of increasing the ICT competency of a Maths teacher. The study analyzes the concept of ICT competency of a Maths teacher and considers the possibilities of its formation in different countries. One of the ways to increase the ICT competency of a Maths teacher is to use the “Personal e-learning environment of the Maths teacher” online course. The authors describe the model of the developed course, which is based on the ADDIE model and takes into consideration the key activities of a teacher. The experiment, conducted among master’s students majoring in “Secondary education. Mathematics” showed the positive effects of the developed course on the level of their ICT competency. The redistribution of the percentage of the students towards normative and high levels of ICT competency formation was observed.
Computer addiction as a new way of personal self-realization of student youth
Authors: Yakovytska L S , Pomytkina L V , Synyshyna V M , Ichanska O M , Hordiienko K O 
Published: June 2022

Abstract
The article presents the results of an empirical study of computer addiction of student youth in the context of personal self-realization by parameters: motivation to succeed, volitional self-regulation, development of emotional intelligence. The aim of the article is to analyze the manifestations of computer addiction as a new way of personal self-realization, to empirically investigate the relationship of individual psychological factors of self-realization of personality by parameters: motivation to succeed, volitional self-regulation, development of emotional intelligence with subjective assessment of computer addiction by the student youth. Psychodiagnostic methods were used: test for Internet addiction of K. Young; Shostrom’s personal orientation (short form) in the modification of E. Jones and R. Crandall; N. Hall’s emotional intelligence test, a questionnaire to study the motivation to succeed of T. Ehlers; questionnaire “Study of volitional self-regulation” by A. Zverkov and E. Eidman. The study allowed to obtain significant correlations between computer dependence and the level of self-actualization, volitional self-regulation and its components, self-management of emotions as a component of emotional intelligence. Virtual space for the younger generation in modern conditions serves as a means of meeting those significant needs that are frustrated in real conditions. In particular, personal self-realization in student youth is transferred to cyberspace through new hobbies, acquaintances and attributions of their own “I”. Thus, computer addiction in this study was considered as a new way of personal self-realization of student youth, which is still treated mainly as a form of deviant behavior. Self-realization on the Internet for modern youth is a significant area of personal self-realization in general, which under favorable conditions complements self-realization in reality, and under adverse conditions replaces self-realization in reality. Taking into account these points will allow to build a system of psychological work with different levels of computer addiction of student youth in the context of their personal self-realization.
Preliminary evaluation of inverse scattering-based plasma-profilometry application to fusion plasmas
Authors: Mascali D. , Torrisi G. , Di Donato L. , Sorbello G. , Naselli E. , Pavone S. C. , Ceccuzzi S. 
Published: June 2022

Abstract
A new diagnostic method able to perform plasma profilometry is investigated in this work to retrieve the plasma electron density profile in front of the Ion Cyclotron Range of Frequencies (ICRF) antennas. As a reference scenario for our numerical study, the Divertor Tokamak Test (DTT [1]) ICRF antennas and plasma will be considered. Specifically, the profilometry needs to solve an inverse scattering problem, which is non-linear and ill-posed. In some recent papers [2, 3], plasma imaging profilometry in compact plasma reactors, such as the electron cyclotron ion sources (ECRIS), has been proposed and tested numerically by means of proof-of-concept examples. In particular, proper formulation of electromagnetic inverse scattering techniques have been proposed, requiring measurements of the reflection coefficient in presence of a metallic reflecting surface or, alternatively, both the reflection and transmission coefficients through two antennas facing one each other. In this paper, we would like to investigate this method also for large-size (scale-length) fusion reactors by addressing the profilometry of DTT-like plasma, assuming a very high-frequency probing regime (∼0.5 THz) for the accessibility of both O and X-modes in the DTT plasma (electron density up to 1020 m−3 and magnetic field up to 9 T). To this aim, we adopt COMSOL Wave Optics® module based on beam propagation method (or slowly varying envelope approximation) for simulating the wave propagation and to determine the probing frequencies. A proper formulation allowed to reconstruct a tiny scrape-off plasma layer, approximated as an isotropic medium, thanks to the high probing frequency.
Numerical analysis of radon behavior in radon-suppressed clean room environments
Authors: Di Marcello V. , Ianni A. , Panella G. 
Published: June 2022

Abstract
Radon-free clean rooms are essential for the production and
assembly of components adopted in low-background experiments. In
particular, long-lived radon decay products are often problematic
for rare events searches, such as low energy neutrino interactions,
direct dark matter detection, and neutrinoless double beta decay.
These isotopes can easily deposit onto surfaces exposed to radon,
leading to a residual background that can limit the sensitivity of
experiments. In order to mitigate this background source,
construction of detectors in radon-reduced environments is
essential. In this framework, design and building of
radon-suppressed clean rooms require a deep understanding of the
radon behavior and the different sources of contamination. In the
paper, computation fluid-dynamics (CFD) analyses of the
radon-suppressed clean rooms built for the DarkSide-50 experiment
are reported. The numerical model including the main radon
contributions, such as structural materials, equipment, and
operators activity, provides very promising results in a remarkable
agreement with available experimental data, confirming the validity
of the current modelling approach for future applications.
Sustainable irrigation technologies: a water-energy-food (WEF) nexus perspective towards achieving more crop per drop per joule per hectare
Authors: Taguta Cuthbert , Dirwai Tinashe Lindel , Senzanje Aidan , Sikka Alok , Mabhaudhi Tafadzwanashe 
Published: June 2022

Abstract
Sustainable agricultural intensification requires irrigation methods and strategies to minimize yield penalties while optimizing water, land and energy use efficiencies. We assessed, from a silo-based and integrated water-energy-food (WEF) nexus perspective, the performance of irrigation technologies in different agro-climatic regions. Secondary to this, we assessed the impact of adopting systematic approaches such as the WEF nexus on improving efficiency in irrigated agriculture through irrigation modernization. The evidence-based perspectives of silo-based performances individually considered the metrics of yield (Y), water use efficiency (WUE), and energy productivity (EP). The WEF nexus approach applied sustainability polygons to integrate the three metrics into a nexus index representing the holistic performance of the irrigation technologies. Silo-based performance in temperate regions suggests net gains for WUE (+1.10 kg m−3) and Y (+6.29 ton ha−1) when transitioning from furrow to sprinkler irrigation, with a net loss in EP (−3.82 ton MJ−1). There is potential for a net loss on EP (−3.33 ton MJ−1) when transitioning from furrow to drip system in temperate regions. The best performance of irrigation technologies in dry regions in water, energy and food silos was achieved by sprinkler, drip and furrow irrigation systems, respectively. Thus, appraising irrigation technologies from a silos perspective promotes individual silos, which renders an unsustainable picture of the performance of irrigation systems. The integrative WEF nexus approach successfully highlighted the trade-offs and synergies in the nexus of water, energy and food in irrigated agriculture. Drip irrigation led all irrigation technologies in WEF nexus performance in dry (21.44 unit2), tropical (23.98 unit2), and temperate regions (47.28 unit2). Overall, the irrigation modernization pathway to drip technology from either furrow or sprinkler systems improves irrigated agriculture’s WEF nexus performance in all three regions for more crop per drop per joule per hectare under climate change. This can promote inclusive and sustainable irrigation development within the planetary boundaries.
Development of solid phase extraction with carbon nanoonion-polyaniline composite sorbent followed by microextraction method for the extraction of pesticides residues before gas chromatography
Authors: Shokouhmandi Zahra , Shokrollahi Ardeshir 
Published: June 2022

Abstract
Organophosphate and triazole compounds are among the pesticides and fungicides that are classified as highly toxic materials because of their chronic and dangerous effects at low and moderate oral doses. Therefore, the measurement and extraction of small amounts of these compounds are of great importance for human and environmental health. In the present study, solid-phase extraction (SPE) was performed with carbon nano onion (CNO)-polyaniline (PANI) nanocomposite sorbent for the extraction of residual organic pesticides before gas chromatography (GC), so CNO was synthesized and covered with a layer of PANI for this purpose. The synthesized sorbent was analyzed and studied using different characterization methods. The prepared sorbent was used to extract pesticides from an aqueous medium. Then, for further preconcentration, the eluent of the SPE column was followed by a dispersive liquid-liquid microextraction (DLLME) method that had acceptable repeatability to the point that a wide linear range in 0.1–1000 μg l−1 (R2 > 0.99) was obtained for most analytes. Finally, pesticides determination in rainwater, apple juice, and cherry juice samples was conducted by the developed method.
Preparation and fluorescence properties of MgAl2O4: Tb3+ nanorod-like phosphors
Authors: Lu Yang , Wang Jing , He Lijie , Hao Chunlai , Wang Fudong , Zhang Jiaming 
Published: June 2022

Abstract
A series of MgAl2O4: x% Tb3+ (x = 1.0–6.0) phosphors was prepared by a hydrothermal-assisted light burning method. The crystal structure, morphology and fluorescence properties of the samples were investigated. The results indicated that when the the hydrothermal and light burning temperatures were determined to be 120 °C and 1100 °C, respectively, the crystallinity for Mg4Al2(OH)14 and NH4Al(OH)2CO3 biphasic precursors is the best, conducive to generating pure phase MgAl2O4 nanorod-like phosphors. The entry of Tb3+ into the MgAl2O4 lattice can cause lattice distortion, but the main structure of the spinel does not change. The main emission peaks for the series of phosphors are located in the green light region of 546 nm. The MgAl2O4: 4.0% Tb3+ phosphor has the highest fluorescence intensity and shows the best colour quality. Its CIE coordinates (x, y), CCT and colour purity are determined to be (0.3171, 0.5290), 5845 K and 53.50%, respectively. The series of MgAl2O4: Tb3+ phosphors exhibits typical cold green light emission and have good application prospects in solid-state display devices.
Poly(lactic acid) toughen by aromatic sulfonamide toward balanced rheology processing and mechanical properties
Authors: Chu Wenpeng , Yan Song , Cai Ziqing , Yang Shiwen , Hu Xinghui , Yin Xianze 
Published: June 2022

Abstract
The inherent brittleness of poly(lactic acid) (PLA) usually limits its application in the high ductile requirements sector. To address the above issue, n-ethyl-p-toluenesulfonamide (N-PTSA) as the toughening agent, was utilized to optimize the rheological and mechanical performance of the PLA matrix. The microstructure, thermal stability, rheological behavior, and mechanical properties of PLA/N-PTSA were systematically investigated. A rheological test showed that N-PTSA can reduce the melt processing viscosity of PLA matrix and the decreasing of processing viscosity strongly depended on the N-PTSA content rather than shear rate. Mechanical properties results confirmed that the 14.7% N-PTSA can improve the toughness of PLA/N-PTSA without deteriorating the tensile strength and Yong’s modulus. This reason was ascribed to the reduction of hydrogen bonds of PLA matrix caused by N-PTSA to accelerate the movement of PLA molecular chain meanwhile forming new hydrogen bond between PLA and N-PTSA. By adding N-PTSA, the thermal stability of PLA was decreased. With the synergistic effect of plasticizing and toughening N-PTSA, the rheology and mechanical properties of PLA had been effectively improved.
A robust statistical analysis of the role of hydropower on the system electricity price and price volatility
Authors: Owolabi Olukunle O , Lawson Kathryn , Sengupta Sanhita , Huang Yingsi , Wang Lan , Shen Chaopeng , Getmansky Sherman Mila , Sunter Deborah A 
Published: June 2022

Abstract
Hydroelectric power (hydropower) is unique in that it can function as both a conventional source of electricity and as backup storage (pumped hydroelectric storage and large reservoir storage) for providing energy in times of high demand on the grid (S. Rehman, L M Al-Hadhrami, and M M Alam), (2015 Renewable and Sustainable Energy Reviews, 44, 586–98). This study examines the impact of hydropower on system electricity price and price volatility in the region served by the New England Independent System Operator (ISONE) from 2014-2020 (ISONE, ISO New England Web Services API v1.1.” https://webservices.iso-ne.com/docs/v1.1/, 2021. Accessed: 2021-01-10). We perform a robust holistic analysis of the mean and quantile effects, as well as the marginal contributing effects of hydropower in the presence of solar and wind resources. First, the price data is adjusted for deterministic temporal trends, correcting for seasonal, weekend, and diurnal effects that may obscure actual representative trends in the data. Using multiple linear regression and quantile regression, we observe that hydropower contributes to a reduction in the system electricity price and price volatility. While hydropower has a weak impact on decreasing price and volatility at the mean, it has greater impact at extreme quantiles (>70th percentile). At these higher percentiles, we find that hydropower provides a stabilizing effect on price volatility in the presence of volatile resources such as wind. We conclude with a discussion of the observed relationship between hydropower and system electricity price and volatility.
Deepening the knowledge of rare diseases dependent on angiogenesis through semantic similarity clustering and network analysis
Authors: Pagano-Márquez Raquel , Córdoba-Caballero José , Martínez-Poveda Beatriz , Quesada Ana R , Rojano Elena , Seoane Pedro , Ranea Juan A G , Ángel Medina Miguel 
Published: June 2022

Abstract

Background
Angiogenesis is regulated by multiple genes whose variants can lead to different disorders. Among them, rare diseases are a heterogeneous group of pathologies, most of them genetic, whose information may be of interest to determine the still unknown genetic and molecular causes of other diseases. In this work, we use the information on rare diseases dependent on angiogenesis to investigate the genes that are associated with this biological process and to determine if there are interactions between the genes involved in its deregulation.

Results
We propose a systemic approach supported by the use of pathological phenotypes to group diseases by semantic similarity. We grouped 158 angiogenesis-related rare diseases in 18 clusters based on their phenotypes. Of them, 16 clusters had traceable gene connections in a high-quality interaction network. These disease clusters are associated with 130 different genes. We searched for genes associated with angiogenesis througth ClinVar pathogenic variants. Of the seven retrieved genes, our system confirms six of them. Furthermore, it allowed us to identify common affected functions among these disease clusters.

Availability
https://github.com/ElenaRojano/angio_cluster.

Contact
seoanezonjic@uma.es and elenarojano@uma.es
Serum potassium changes during hypothermia and rewarming: a case series and hypothesis on the mechanism
Authors: Boubes Khaled , Batlle Daniel , Tang Tanya , Torres Javier , Paul Vivek , Abdul Humaed Mohammed , Rosa Robert M 
Published: June 2022

ABSTRACT

Introduction
Hypokalemia is known to occur in association with therapeutically induced hypothermia and is usually managed by the administration of potassium (K+).

Methods
We reviewed data from 74 patients who underwent a therapeutic hypothermia protocol at our medical institution.

Results
In four patients in whom data on serum K+ and temperature were available, a strong positive correlation between serum K+ and body temperature was found. Based on the close positive relationship between serum K+ and total body temperature, we hypothesize that serum K+ decreases during hypothermia owing to decreased activity of temperature-dependent K+ exit channels that under normal conditions are sufficiently active to match cellular K+ intake via sodium/K+/adenosine triphosphatase. Upon rewarming, reactivation of these channels results in a rapid increase in serum K+ as a result of K+ exit down its concentration gradient.

Conclusion
Administration of K+ during hypothermia should be done cautiously and avoided during rewarming to avoid potentially life-threatening hyperkalemia. K+ exit via temperature-dependent K+ channels provides a logical explanation for the rebound hyperkalemia. K+ exit channels may play a bigger role than previously appreciated in the regulation of serum K+ during normal and pathophysiological conditions.