bluuebunny/crossref_metadata_2025 huggingface dataset:
Three-Dimensional Visualization of Adsorption Distribution in a Single Crystalline Particle of a Metal-Organic Framework
Authors: Yamada Emina , Sakamoto Hirotoshi , Matsui Hirosuke , Uruga Tomoya , Sugimoto Kunihisa , Ha Minh-Quyet , Dam Hieu-Chi , Matsuda Ryotaro , Tada Mizuki
Published: December 2023

Many unique adsorption properties of metal-organic frameworks (MOFs) have been revealed by diffraction crystallography, visualizing their vacant/guest-loaded crystal structures at the molecular scale. However, it has been challenging to see the spatial distribution of the adsorption behaviors throughout a single MOF particle in a transient equilibrium state. Here, we report three-dimensional (3D) visualization of molecular adsorption behaviors in a single crystalline particle of a MOF by operando X-ray absorption fine structure spectroscopy combined with computed tomography for the first time. The 3D maps of water-coordinated Co sites in a 100-µm-scale MOF-74-Co crystal were obtained with 1 µm spatial resolution under sever-al water vapor pressures. Through the visualization of the water vapor adsorption process, the 3D spectroimaging revealed the mechanism and spatial heterogeneity of guest adsorption inside a single particle of a crystalline MOF.
Chemical Proteomics-based Target Prioritization through a Residue Agnostic Ligandability Assessment Platform
Authors: Erdogan Fettah , Chowdhury Raiyan , Beldar Serap , Chandy Tom Bobby , Allan Rebecca G. , Araujo Elvin D. de , Gunning Patrick T.
Published: December 2023

The landscape of drug discovery is undergoing a transformative phase with the influx of structural biology and omics data. Identifying optimal drug targets amid this data surge presents a multifaceted challenge. Covalent inhibitors, once undervalued, now hold substantial promise, especially targeted covalent inhibitors (TCIs), effectively engaging 'undruggable' proteins and overcoming resistance mechanisms. Existing ML software can proficiently model covalent ligands but lack comprehensive utility across large chemoproteomics sites. Challenges persist in predicting and assessing cryptic ligandable sites and sites beyond cysteine, demanding advanced computational tools. As cysteine-ligandable proteins represent only ~20% of the quantifiable proteome, there is a requirement for ligandability mapping of other nucleophilic amino acids. This study introduces a pioneering computational pipeline leveraging an AI-based ligandable predictor for meticulous evaluation of chemical proteomics-based reactive sites. The pipeline offers a scalable framework to assess covalent ligandability on a large scale, filter out improbable hits and systematically evaluate potential drug targets. Our work addresses covalent drug design challenges through a pipeline that fills crucial gaps in predicting cryptic ligandable and covalent sites in addition to cysteines to foster more efficient drug discovery methodologies.
INDUCCIÓN DEL PERSONAL Y COMPORTAMIENTO ORGANIZACIONAL EN LOS TRABAJADORES DE LAS FERRETERIAS MI KARINA, SULLANA
Authors: Cornejo Pedrera Angie de los Milagros
Published: December 2023

El estudio tuvo como objetivo Determinar la relación entre la inducción del personal y comportamiento organizacional en los trabajadores de las ferreterías mi Karina, Sullana. El método fue de tipo aplicada, diseño no experimental, nivel correlacional y enfoque cuantitativo. La población y muestra estuvieron conformados por los 32 trabajadores. Para el procedimiento de recolección se usó el análisis exploratorio, evaluando las variables Inducción del personal y comportamiento organizacional con el instrumento-cuestionario que constó de 26 interrogantes para la primera variable y 29 para la segunda de acuerdo a la escala de Likert. Los resultados, para el procesamiento de datos se usó el programa SPSS Vers-26, con datos organizados en cuadros simples de doble entrada, frecuencia relativa y absoluta. Concluyendo la existencia de una correlación directa proporcional, entre las variables Inducción del personal y comportamiento organizacional, determinado que existe una correlación positiva considerable con un valor de Spearman de r=0.745, así se utilizó el Rho de Spearman, donde el resultado de su Sig. Bilateral es 0.00 y por medio de la regla (Sig. 0.000 ≤ 0.05), se puede concluir el rechazo de la hipótesis nula y aceptación de la hipótesis alterna.
EL TELETRABAJO PARA INCREMENTAR EL DESEMPEÑO LABORAL EN LAS ENTIDADES DEL ESTADO
Authors: Ramos Cárdenas Thalya Antonella
Published: December 2023

Este artículo de revisión científica analizó el teletrabajo para incrementar el desempeño laboral de los colaboradores en las Entidades del Estado. Para cumplir este objetivo, se siguió una metodología que implicó la búsqueda de 51 artículos en bases de datos como ProQuest, Scielo, Scopus, Dialnet, EBSCO y Redalyc; dichos artículos se seleccionaron considerando el año de publicación, el área de investigación, el idioma y su relevancia para el tema central. Los resultados de la investigación revelaron que la gestión del teletrabajo se ha convertido en una modalidad viable gracias al uso de las Tecnologías de la Información y la Comunicación (TIC). Esto ha beneficiado a los servidores públicos al permitirles llevar a cabo sus funciones fuera de las instalaciones de la entidad, lo que incluye trabajar desde sus hogares o lugares distintos al centro laboral. Este enfoque ha demostrado ventajas tanto para los trabajadores, al reducir los costos asociados, como para los empleadores, al disminuir los gastos laborales. Se concluyó que, en un mundo en constante cambio, la adopción del teletrabajo ofrece numerosos beneficios a los colaboradores, permitiéndoles un mayor control sobre su tiempo y actividades, lo que, a su vez, contribuye a su bienestar y mejora su desempeño laboral. En resumen, la gestión del teletrabajo, respaldada por el uso de las TIC, ha demostrado ser una estrategia eficaz para mejorar el desempeño laboral de los colaboradores en las Entidades del Estado, al tiempo que ofrece ventajas significativas tanto para los trabajadores como para los empleadores.
FORMATION DIRECTIONS OF PUBLIC ADMINISTRATION OF STRATEGIC DEVELOPMENT OF UKRAINIAN AGRICULTURAL COMPLEX
Authors: Dragan Iryna , Datsii Nadiya , Dragan Ivan
Published: December 2023

The article mentions the importance and urgency of considering the issues of the state policy of the agro-industrial complex of Ukraine, which acquires a new meaning for the military economy in the context of the rapid growth of production and export volumes during the last decade. In the conditions of a full-scale invasion of the Russian Federation, the sharp decline and destruction of industrial production and the curtailment of metallurgical exports led to the accelerated restructuring of Ukraine's economy, significantly increasing the importance of the agricultural sector in its structure and exports.

It was determined that the priority of the development of the agricultural sector and rural areas is determined by the exceptional importance of the production of agricultural products and food in human life.

It has been proven that the development of the policy for the development of the food industry, the implementation of target programs for the development of agriculture in order to ensure the satisfaction of the population's needs in food products are the vectors of the development of the domestic agro-industrial complex.

Among the important and significant directions of the development of innovative processes, the following vectors are highlighted: technological modernization and re-equipment of the infrastructure of the agro-industrial complex; implementation of energy- and resource-saving technologies for obtaining and storing agricultural products, including; maintenance of soil fertility, development of adaptive technologies - agro-ecosystems and agro-landscapes; development of production of organic agricultural products; creation of a modern system of information and infrastructural support for innovative activities in the agricultural sector; strengthening the role of state organizations in the activation of innovative activities.
MANAGEMENT IMPACT OF THE STATE ON TRANSFORMATION PROCESSES IN THE FINANCIAL SECTOR OF UKRAINE
Authors: Kovalchuk Veronika
Published: December 2023

Constant internal crises, corruption, ineffective and inappropriate reforms, the shadow sector -all theseundermine attempts to stabilize Ukraine's economy. It has been established that globalization, economic instability leads to a decline in production, unemployment, the transition of firms into the shadow sector, rising prices, and hence the deterioration of the financial sector. The article aims atstudyingthe theoretical foundations of the concept totransform the financial sector of the economy and providingpractical recommendations for the introduction of a new synergetic concept. The object of theresearch is the financial sector of Ukraine.The article analyzes the theoretical foundations and the current state of the financial sector of Ukraine. The identified shortcomings in the functioning of the model of the state regulation of the financial sector have made it possible to propose ways of its improvement in the conditions of globalization, for example, through the introduction of an effective policy of anti-crisis management at the macro level (national) and macro level (separate financial institutions). Complex application of its mechanisms will reduce the impact of the consequences of the crises of the past years, and timely diagnosis of the global trends will contribute to effective overcoming future crisis phenomena. It is proved that the new synergetic concept should be based on the development of social orientation, that is, the prevention of the collapse of regulatory and value structures and the weakening of theirsocializing and regulatory functions. As a result of the analysis of foreign experience in the transformation of the financial sector, proposals and recommendations for anti-crisis regulation have been developed, which will ensure the coordinated work of the state bodies supervising financial activities, create the necessary conditions for the implementation of financial innovations, the efficient work of all financial institutions and, eventually, will form the necessary environment for stable developmentof the entire Ukrainian economy. In general, the implementation of the above suggestions and recommendations will increase the efficiency of the process of transformation of the financial sector, optimize the organization of banking institutions, and ensure the creation of a program of the state crisis management of the financial sector of Ukraine in the conditions of globalization.
ISSUES OF IMPLEMENTING SUSTAINABLE DEVELOPMENT GOALS IN THE CURRENT CONTEXT
Authors: Bokovykova Yulia
Published: December 2023

The research paper is devoted to the issue of implementing the sustainable development goals in the current context. Based on the analysis of international legal acts and doctrinal provisions, the author states that the issues of the managerial aspect of implementing the sustainable development goals are insufficiently developed. The author defines the content of the concept of "sustainable development" from the perspective of public administration. In the historical retrospective, the process of implementing the sustainable development goals in the legislation of Ukraine is studied. The author identifies a list of sustainable development goals which cannot be implemented without assessing the state of pollution of territories in general and certain types of resources (water, land, forest, atmospheric, subsoil). The article focuses on the need to amend the Rome Statute of the International Criminal Court, in particular, Article 8 "War Crimes", with regard to recording of crimes against the environment. It is stated that the future post-war reconstruction of the country should be based on an assessment of the risks associated with anthropogenic pressure, and the involvement of the international community in financing in the field of risk assessment and mitigation. The author proves the need for the state to stimulate the implementation of the SDGs (using legal, economic, organisational, and other instruments) for business. The process of establishing advisory bodies in Ukraine aimed at coordinating the activities of public authorities in relation to the implementation of the SDGs and targets is described. The author identifies promising areas of scientific research on the subject matter under study: specification of the above-mentioned managerial aspects of implementing the sustainable development goals in assessment methods, practices of interaction between the government, business and society based on benchmarking, training programmes, etc. Based on the results of the study, the author concludes that the following managerial aspects of implementing the Sustainable Development Goals should be identified: risk assessment; recording of environmental crimes and liability for them in international documents; transition of public administration to a proactive approach, which includes, among other things, encouraging society and business to support the SDGs.
GLOBAL MODELS OF STATE REGULATION OF THE BANKING SECTOR
Authors: Veretelnikov Ihor
Published: December 2023

The study and systematization of foreign experience in the organization of the functioning of the banking system, the study of the role of the state in this process, the determination of the best practices that can be applied in Ukraine, is an actual direction of scientific research.

The main criterion for the classification of models of state regulation of the banking sector is the degree of state intervention in banking activity. Based on the analysis of research on approaches to the classification of models of state regulation of the banking sector and considering the most widespread practices in the countries of the world, it is proposed to distinguish liberal, European, American, mixed, transitional, and Islamic models of state regulation of the banking sector. The main characteristics of the models were systematized and the possibilities of their application in Ukraine were assessed.

It was determined that, considering the need to maintain stability and avoid risks, the European model is more appropriate for the conditions of Ukraine. An active role of the state in regulation can help prevent financial crises and ensure the reliability of banks. A mixed model, which allows combining elements of different models, can help create a flexible regulatory framework that considers the unique aspects of the Ukrainian economy and financial system. Under martial law, a transition model characterized by strong state intervention to stimulate development and financial inclusion is the most appropriate.

The study analyzed the degree of suitability of the proposed models in wartime conditions in terms of the priority tasks of the state regarding the regulation of the banking sector in wartime conditions, namely ensuring stability and reliability, efficiency, and flexibility, stimulating the economy and recovery, minimizing risks, and protecting the financial interests of citizens.

The theoretical justification of the role and functions of the central bank in the system of state regulation of the banking sector, as well as the development of mechanisms for increasing its efficiency in the conditions of martial law, may be the direction of further scientific research.
Intersubject connections in the focus of teaching English in higher education institutions
Authors: Nasakina S. , Maiev A.
Published: December 2023

The article is dedicated to the analysis of English language teaching, taking into account the experience of implementing interdisciplinary connections in English classes at agricultural universities. The relevance of the article stems from the necessity to explore the subject relations between humanitarian disciplines and the courses “Foreign Language” and “Business Foreign Language”. The article addresses the current issue of the possibilities for implementing the “Law on the Use of the English Language in Ukraine”.

In the scientific literature, there is a multitude of opinions regarding the definition of the term “interdisciplinary connections”, leading to a significant number of works dedicated to various aspects of interdisciplinary connections. When characterizing the main features of interdisciplinary connections, the authors demonstrate the potential for reevaluating the process of teaching English in non-language higher educational institutions and highlight some advantages of implementing interdisciplinary connections, as observed in the process of teaching a foreign language to bachelorʼs and masterʼs students at Odessa State Agrarian University. These advantages include increased motivation among the students and enhanced communicative interaction among participants in the educational process.

The incorporation of an interdisciplinary approach in the context of using the English language in contemporary settings can find application in the development of work programs, the creation of English language manuals and online textbooks, as well as in the formulation of methodological recommendations. In the context of modern educational policy, the teaching of foreign languages in non-language higher education institutions can be approached from the perspective of both formal and informal education. This approach is characterized by the interdisciplinary integration of the courses “Foreign Language” and “Business Foreign Language” with humanities courses such as “Philosophy and Social Ethics”, “History of Ukrainian Statehood”, and “Ukraine – European Union”.
The linguistic and didactic potential of a culinary recipe in teaching Ukrainian as a foreign language
Authors: Prozhohina I.
Published: December 2023

The primary challenge in teaching Ukrainian as a foreign language is to identify language units, speech genres, or text types relevant for use in the educational process to develop the communicative and linguistic-cultural competence of learners. Given the significance of gastronomic culture in the modern world, a culinary recipe can serve as a valuable source of information about national cultural traditions and material for developing communication and intercultural skills.

The article explores the concept of a ʼculinary recipeʼ and the specific characteristics that make it a distinct type of text with potential applications in teaching Ukrainian as a foreign language. It argues that the linguistic and didactic potential of a culinary recipe is grounded in its features, such as compact size, the presence or potential use of visual aids for information presentation, a typical and repeated text structure, and optimal lexical content in terms of frequency of usage and stylistic neutrality. This content includes background and non-equivalent vocabulary, borrowings, internationalisms, hyperonyms, hyponyms, words related to product names, dishware, and other kitchen utensils, gustatory and deverbative culinary adjectives, as well as culinary verbs and verbs related to food processing.

The article also emphasizes the presence of typical structural models in word combinations and sentences. Special attention is given to the appropriateness and effectiveness of studying dish names and processing productive grammatical models, particularly word combinations. It highlights the importance of avoiding categorical imperatives in language materials and suggests processing culinary instructions primarily with the verb form in the 1st person plural.

In conclusion, the author recommends the integration of culinary recipes into Ukrainian language classes for foreign language learners, particularly for students at proficiency levels approaching A2–B1.
WAYS OF ORGANIZING THE EDUCATIONAL PROCESS OF ACADEMICALLY GIFTED STUDENTS IN HIGHER EDUCATION INSTITUTIONS OF CHINA
Authors: Tiwen Huang
Published: December 2023

In the process of identifying capable and academically gifed students in Chinese higher education institutions and students in secondary comprehensive schools, it is possible to go in several directions:

The ﬁrst of them is the diagnosis of the abilities of students whom we classify as academically gifted.

The second direction in the research of scientists, related to ﬁnding the criteria of giftedness, is based on three component spheres of personality - cognitive, emotional-eﬀective and psychomotor.
European integration of Ukraine as a factor of transformation of legal practice (theoretical and legal aspect)
Authors: Beresten Artem
Published: December 2023

The article discusses the directions for development of legislation that would correspond to the Constitution of Ukraine and its recognized legal principles, which are closely linked to the enhancement of the role of law in the legal system of Ukraine. In the context of Ukraine's European integration processes, as a candidate state for EU membership, the main factors influencing the reform of Ukraine's legal system are analyzed, and priorities for the development of legislative initiatives are identified, including those relating to the problems of organizational and legal support for the development of judicial cooperation in civil and criminal cases, using international and bilateral documents based on the principles of legal certainty and the right to a fair trial. Changes to the legislation "On National Minorities (Communities) of Ukraine" and laws for the implementation of the rights and freedoms of individuals and citizens of Ukraine in accordance with generally recognized norms of international law and European conventions ratified by Ukraine are also discussed. Special attention is paid to the principles of development and improvement of legislation, namely the principles of the rule of law, strict adherence to constitutional provisions, democracy, social expediency, scientific justification, systematic and coordinated legislative activity, the interrelationship and interaction of legislative acts, and the priority of generally recognized norms and principles of international law over national legislation.

In light of the above, an important task in the process of legal practice is to highlight the mechanisms for ensuring the development of legislation, including the legal principles of law-making, organization and coordination of legislative activities. Special emphasis is placed on improving legislative techniques, providing information support for legislative activities, and scientific support for law-making.
Reseacrh of the possibilities of 3d-visualisation model of classrooms of the department
Authors: Pomohaiev Kostiantyn , Tolstoluzhskaya Elena , Artyukh Oleksiy
Published: December 2023

It is difficult to imagine modern technologies without the 3D modeling and 3D visualization. The most important advantage of this technology is the possibility to create and inspect virtually 3D models of any objects which takes much less time than creating these objects physically. Therefore, this technology allows creating cartoons, films, virtual tours, and advertisements. Nowadays there are many programs for creating 3D models, which are constantly developed and updated. In this work the process of creating the 3D model of the V.N. Karazin University classrooms is described, which allows conducting virtual tours of the university. Blender, the free 3D computer graphics software tool has been used to develop the model. The main advantage of Blender over other programs is that, each user is able to create applications for this program. The development stages, namely, a concept phase, a 3D modeling, an application of textures and colors, lighting, and rendering are described. In order to understand the capabilities and functions of the created 3D-model, the methodology of functional modeling IDEF0 has been used. With the help of IDEF0 notation the scheme of 3D-model has been created. The processes of users’ interaction with 3D-model have been considered. The opportunities presented by the 3D model of classrooms have been investigated. The developed interactive 3D model is available to users on the university site. Users can choose an object or field of view, angle, and tilt angles. Users can also zoom in or out of the image. Thus, using the developed 3D model, users can learn about the classrooms and their interior. We are planning to increase the efficiency of the process of creating such 3D models by creating add-ons to Blender in Python language which allows automating the process of creating a 3D object. Their using can reduce the time needed to create 3D models of remaining classrooms, as well as, the number of developers required.
Mathematical modeling of the dynamics of aquatic ecosystems and the possibilities of their self-cleaning at the conditions of global climate change
Authors: Rychak Nataliya , Kizilova Nataliya
Published: December 2023

A detailed review of mathematical models of pollution dispersion in air, water and soil is presented in the article. The models are represented by the systems of differential equations and used for water resources management on urban landscapes. Detailed three-dimensional equations of mass, momentum and heat transfer, averaged two-dimensional dispersion models on terrain maps, one-dimensional dispersion models in river systems and zero-dimensional compartmental models have been considered. The biotic component and the impact of the effects of gradual global climate change have been taken into account. The tasks for external quality management of water, air and soil, as well as the possibilities of the ecosystem for self-management have been considered. The problems of fuzzy data for validation as well as the usage of mathematical models for practical purposes have been discussed.
SINGLE AND DUAL-POINTING DEVICE FOR MOVING THE SAMPLE LU-40 KIPT
Authors: Vodin A. N. , Bykov V. T. , Kushnir V. A. , Malovitza M. S. , Olejnik S. N. , Tuller G. E. , Tertichniy A. V.
Published: December 2023

Developed two electro-mechanical device with remote control, designed to move the samples one and two dimensions in a highbackground radiation. Samples movement carried in mechanical block by stepper motor with holding torque 5.6 kgf·cm and angle precision 1.8°/step. Motor control and control of samples coordinates implements by dint on electronic block, based on PIC16f76 microcontroller and Usart-RS485 interface converter based on Max 485 microchip. Devices can move objects weighing up to 100 g with an accuracy of 0.5 mm. The testing of the two-coordinate device in experiments on electron beam accelerator LU-40 KIPT have been held. The two-dimensional distribution of relative density of the flow distribution of brake γ-rays have been measured by ionization detector.
Self-Consistent Description of Interacting Phonons in a Crystal Lattice
Authors: Poluektov Yu. M.
Published: December 2023

Self-consistent approach for interacting phonons description in lattice, which generalizes Debye model, is proposed. Notion of “selfconsistent” phonons is introduced, speed of which depends on temperature and is determined from non-linear equation. Debye energy is also a function of temperature in this approach. Thermodynamics of “self-consistent” phonon gas is constructed. It is shown, that at low temperatures there is a correction propotional to the seventh power of temperature to the cubic law of specific heat dependence on temperature. This may be one of the reasons why cubic law for specific heat is observed only at rather low temperatures. At high temperatures the theory predicts linear deviation from Dulong-Petit law, which is observed experimentally.
Accounting of the Elasticity Modules Anisotropy in HSP Metals for X-Ray Investigations of Dislocation Structure
Authors: Malykhin D. G.
Published: December 2023

A calculation of X-ray diffraction on the dislocation structure of polycrystalline materials with the biaxial anisotropy of the crystal lattice has been carried out. The task was reduced to definition of the field of lattice distortion in this neighborhood applied to edge dislocations of the «c» type in condition of anisotropy of elastic modules of a crystal. As a result of general solution of this task, a parameter of spatial anisotropy of the distortion field was defined from elastic modules and further included into tensors of transformation of both initial isotropic model of this field and its coordinates. According to this principle a modified mathematical model of the field of elastic atomic displacements in the neighborhood of an edge dislocation has been built. The final result shows that this anisotropy entirely reflects onto dislocation specific parameters of distortion that can be obtained by an XRD method for determination dislocation distributions and density. It is noted that for hcp metals widely used, accounting of this anisotropy would be reduced to small corrections of parameters.
Recularities of Investigation of Mechanical Properties of TVEL Covers From Zr-1%Nb Alloys In Longitudinal and Transverse Directions
Authors: Ozhigov L. S. , Savchenko V. I. , Mitrofanov A. S. , Krainyuk Y. A. , Shramchenko S. V. , Vjugov P. N. , Redkina A. P.
Published: December 2023

There is presented results of mechanical properties testing of different type samples from TVEL tubes from Zr-1%Nb alloy. Held investigations with samples tension in tube type and modified samples, shape and dimensions of that are similar with such parameters of ring samples. Held comparison of mechanical properties in longitudinal and transverse directions at standard and modified samples. Notified significant differences of mechanical properties, mostly, relative lengthening (δ%) at testing of modified samples, and also with testing of ring samples with using deformation at cone insertion, in comparison with deformation in axis direction at 2 supports.
Cable Free Transmission of Electricity: from Nikola Tesla to Our Time
Authors: Borts B. V. , Tkachenko I. V. , Tkachenko V. I.
Published: December 2023

Model of Earth charge resonant oscillations excitations based on Tesla experiment, was offered. Solutions of d'Alembert wave equations for electric and magnetic potentials of the charged perfectly conductive sphere were found. Graphic analyses of perturbed potential distribution on the Earth surface was provided. It was shown that obtained solution provides adequate description of Tesla experiment on wireless transfer of electricity conducted in Colorado Springs in 1899 – 1900. In the very low-frequency area of the electro-magnetic oscillations spectrum it was offered to consider the Earth as capacitors battery, consisting of two put one into another perfectly conductive spheres, between which thin dielectric layers is placed. Own oscillation frequencies of the Earth charge were determined in this area. It was shown that these frequencies most precisely correspond to experimentally measured Schumann resonances.
Refining Ancient Lead by Vacuum Distillation
Authors: Virich V. D. , Gorbenko Yu. V. , Kovtun G. P. , Nagorny S. S. , Potina T. S. , Solopikhin D. A. , Shcherban' A. P.
Published: December 2023

A complex method for refining lead by distillation in vacuum has been described. A brief comparative description of different methods of lead refining was submitted. Analysis of different methods showed that to increase the efficiency of lead deep cleaning the development of complex refining processes is required. The computational studies of the behavior of impurity elements in the ancient lead are performed. The ideal coefficients of impurities separation αi are calculated at lead distillation temperatures. The range of volatile and nonvolatile impurities was detected by magnitude αi in lead. Performed computational studies of the impurity elements behavior in lead formed the basis for developing an integrated method of deep refining of ancient lead. To implement this approach the special distillation device was developed, and the procedure of deep purification of lead was described.The results of the study of the deep refining ancient lead have been demonstrated. The cleaning high efficiency of the proposed approach, combined with high performance and yield of the suitable product, was shown. A pilot batch of ancient lead containing base metal > 99.998 wt. % suitable for growing high quality scintillation crystals PbWO4 and PbMoO4 has been produced.
Numerical Simulation and Analysis of the Modified Burgers' Equation in Dusty Plasmas
Authors: Deka Harekrishna , Sarma Jnanjyoti
Published: December 2023

This paper presents a comprehensive study of the numerical simulation of the one-dimensional modified Burgers' equation in dusty plasmas. The reductive perturbation method is employed to derive the equation, and a numerical solution is obtained using the explicit finite difference technique. The obtained results are extensively compared with analytical solutions, demonstrating a high level of agreement, particularly for lower values of the dissipation coefficient. The accuracy and efficiency of the technique are evaluated based on the absolute error. Additionally, the accuracy and effectiveness of the technique are assessed by plotting L2 and L∞ error graphs. The technique's reliability is further confirmed through von Neumann stability analysis, which indicates that the technique is conditionally stable. Overall, the study concludes that the proposed technique is successful and dependable for numerically simulating the modified Burgers' equation in dusty plasmas.
Impacts of Temperature Dependent Thermal Conductivity and Viscosity on Slipped Flow of Maxwell Nanofluid
Authors: Borgohain Debozani
Published: December 2023

The mathematical model to inspect the effects of changeable thermo-physical properties such as thermal conduction, slip effects and viscosity on Maxwellian nanofluid is proposed. The thermal conductivity increases rapidly due to presence of nanoparticles such as metals, carbides, oxides etc. in base fluid. The flow occurs from the stagnated point pass a stretched sheet with slipped conditions. The characteristics of the Brownian motion as well as the thermophoresis processes are also taken into consideration. By means of similarity transformations, the ODEs are reduced from the equations influencing the fluid flow. A built-in solver of MATLAB namely bvp4c which is a collocation formula implementing the Lobatto IIIa finite differences numerical method is applied to solve these transformed equations numerically. The graphs of the numerical outcomes representing impacts of variations in different parameters on the fluid movement, transfer of heat along with mass are analyzed. This investigation leads to an important aspect that as the thermal conductivity in the flow is intensified, the temperature of the fluid reduces with high aggregation of the nanoparticles near the sheet’s surface. Also, the rates of heat and mass transferral depletes due to the relaxation of Maxwellian fluid. Furthermore, the effectiveness of the present numerical computations is determined by carrying out comparisons of heat and mass transferred rates against the previous analytical results for several values of thermophoresis and Prandtl parameters. The effectiveness of its outcomes can be applied in nanoscience technology and polymeric industries for their developments.
The Mechanism of the Formation of Binary Compounds Between Zn and S Impurity Atoms in Si Crystal Lattice
Authors: Zikrillaev Nurulla F. , Khakkulov Maruf K. , Isakov Bobir O.
Published: December 2023

The paper presents the results of an experimental study of surface morphology, elemental composition, electrophysical and optical properties of Si samples earlier doped with impurity atoms of Zn and S. The results of the study revealed a sufficient concentration of Zn and S elements on Si surface after diffusion (3.1% and 2.6% by weight, respectively). After additional thermal treatment at different temperatures, i.e., at 850°C and 875°C, the samples of I group have regained their initial parameters. However, it’s noteworthy that the mobility of charge carriers in group I samples was comparatively lower than that in group II samples allegedly under the influence of Zn and S binary molecules. After additional heat treatment of all samples at a temperature of 875°C, the authors have studied optical absorption coefficients. And their band gap energies were determined using the Tauc Plot method. According to the results of the study, the optical band gaps in group II and III samples were 1.12 eV, whereas the band gap energy in group I samples after additional thermal treatment at a temperature of 875 °C turned out to be 1.31 eV. Having theoretically calculated the band gap by applying Vegard’s law, the authors suggested that the new structure must be of Si0.92ZnS0.08 - type.
Evolution of Mechanical Properties of Pb–Sb–Sn–As–Se Grid Alloys for Lead-Acid Batteries During Natural Aging
Authors: Dzenzerskiy Victor O. , Tarasov Serhii V. , Sukhova Elena V. , Ivanov Volodymyr A.
Published: December 2023

This study is devoted to the investigation of mechanical properties of a series of low-antimony Pb–Sb–Sn–As–Se grid alloys for lead-acid batteries in as-cast condition and after natural aging during storage. Mechanical properties were characterized by ultimate tensile strength, yield strength, elongation, and Young's modulus determined at room temperature using TIRAtest 2300 and P-0.5 universal testing machines. For most investigated as-cast alloys, an increase in ultimate tensile strength is accompanied by an increase in elongation. Within the temperature range between 70 ºС and 150 ºС, higher heating temperature of a casing mold does not markedly affect average elongation but causes the slight decrease (by ~4 %) in average ultimate tensile strength. When aged during storage for 30–33 days, the Pb–Sb–Sn–As–Se grid alloys, attain higher values of ultimate tensile strength, yield strength, and Young's modulus but lower values of elongation. This is due to precipitation of second-phase particles from lead-based solid solution oversaturated by antimony, arsenic, and selenium. The most noticeable effect of strengthening is observed during first five days of natural aging.
Effect of Compensation Degree and Concentration of Impurity Electroactive Selenium Atoms on Current Auto-Oscillation Parameters in Silicon
Authors: Zikrillaev Nurulla F. , Ayupov Kutup S. , Shoabdirahimova Manzura M. , Urakova Feruza E. , Abduganiev Yoldoshali A. , Sattorov Abdujalol A. , Karieva Latofat S.
Published: December 2023

One of the crucial phenomena is auto-oscillations of current in elementary and binary (AIIIBV, AIIBVI) semiconductor materials, which allow the creation of solid-state oscillators with a wide frequency range from 10-3 to 10-6 Hz. In this paper, we show the results of a study on the effect of the degree of compensation (K) and the concentration of electroactive impurity selenium atoms on the excitation conditions and parameters (amplitude, frequency) of the auto-oscillation current associated with temperature and electrical instability in silicon. In the research, silicon doped with selenium atoms Si of identical geometrical dimensions has been used. The compensation degree of the initial boron atoms with impurity selenium atoms in the samples is in the range of K = 2NB/NSe = 0.94-1.1. It was found that excitation conditions, the amplitude and frequency of auto-oscillation current significantly vary depending on the degree of compensation of selenium atoms with boron atoms in the initial silicon. Obtained experimental results showed that the auto-oscillation current in silicon doped with impurity selenium atoms is characterized by ease of control with stable parameters (amplitude and frequency), which makes it possible based on this unique physical phenomenon to develop and create oscillatory circuits in information technology.
Microstructure, Nano-, and Macro-Indentation Characterization of AISI 302 Steel After High-Temperatures Aging
Authors: Ben Lenda Omar , El Ganich Hajar , Saad El Madani
Published: December 2023

The structural and mechanical studies of the AISI 302 steel aim to design a correct heat treatment in order to optimize its mechanical properties. In this study, we investigated the influence of temperature and time of aging on the structural and mechanical characteristics of the AISI 302 steel. The steel was aged at temperatures of 1100°C and 1200°C and for times ranging from 0 to 6000 minutes. The structural and mechanical characterization techniques used were the metallurgical microscope, nanoindentation technique, and macro-hardness test. At the microstructural level, an increase in the time or temperature of the aging contributed to an increase in the austenite grains size of AISI 302 steel. This microstructural change led to a decrease in the nanohardness and a drop in the macro-hardness between the unaged and aged conditions of AISI 302 steel.
The Computer Model of a Thermal Delayed Neutron Fluxes Forming System for Nuclear Medicine
Authors: Gokov Sergey P. , Horbach Viktor M. , Kasilov Valentin I. , Kolpakova Ludmila N. , Lyukhtan Olena A. , Tsiats’ko Evgen V.
Published: December 2023

In the work the computer model of a cell of a system for generating fluxes of therapeutic beams of delayed neutrons, based on the use of delayed fission neutrons, was developed in the Geant 4 environment. The principle of such a neutron source is that when a powerful electron beam interacts with a combined tungsten target and a target containing fissile material, a fission reaction occurs; as a result of which neutrons are emitted. If we move a target activated in this way several tens of meters into a neutron flux generation system consisting of a heater, protection, collimator and reflector, we will obtain a compact neutron source for nuclear medicine. A significant advantage of such a neutron source is the absence of gamma background from the electron accelerator and the combined target, and a bulky protection system is not required. In the Geant 4 environment, the geometry of this cell was developed and a series of experiments were carried out with 107 neutrons. The QGSP BIC HP physical sheet was used. A study of neutron energy spectra showed that more than half of the neutrons whose fluxes are formed using such a cell of the formation system have an energy <100 keV, which is suitable for use for therapeutic purposes. Analysis of the data obtained in a computer experiment made it possible to develop a modified cell of the system for generating streams of therapeutic beams of delayed neutrons, which differs from the basic one by the presence of a solid polyethylene moderator with holes for activated targets and a graphite reflector. Analysis of the data obtained showed that in this case the number of thermal neutrons hitting the detector increases 10 times compared to the base cell, and the energy of 80% of the particles does not exceed 5 keV, which is much better suited for therapeutic purposes.
To the Theory of Dimensional Quantization in Narrow-Gap Crystals
Authors: Utamuradova Sharifa B. , Rasulov Rustam Y. , Rasulov Voxob R. , Urinova Kamolakhon K. , Fayzullaev Kakhramon M.
Published: December 2023

This article discusses studies of size quantization phenomena in zero-, one-, and two-dimensional semiconductor structures. The main attention is paid to the mechanisms of photon-kinetic effects in these structures. Despite many studies of the physical properties of low-dimensional systems of current carriers, the size quantization of energy spectra in narrow-gap semiconductors and the associated photonic-kinetic effects are still insufficiently studied. Therefore, this study focuses on the quantum mechanical study of size quantization in certain cases using Kane's multiband model. The insolvability of the 8×8 matrix Schrödinger equation in the Kane model for a potential well of arbitrary shape is analyzed. The dependence of the energy spectrum on the two-dimensional wave vector is studied for various cases. In particular, the energy spectra for InSb and GaAs semiconductors are considered, depending on the band parameters and the size of the potential well. Conclusions are presented on the analysis of various cases of size quantization in narrow-gap crystals with cubic or tetrahedral symmetry in the three-band approximation. It is shown that the energy spectrum corresponds to a set of size-quantized levels that depend on the Rabi parameter, band gap, and well size. The size-quantized energy spectra of electrons and holes in InSb and GaAs semiconductors are analyzed in a multiband model.
Non-Relativistic Calculation of Excited-State Ionization Potentials for Li-Like Ions Using Weakest Bound Electron Potential Model Theory
Authors: Mateen Muhammad Rameez , Zafar Roohi , Rajput Ahmed Ali , Ur Rehman Shafiq , Zahid Muhammad Mustaqeem
Published: December 2023

In this study, a well-known Weakest Bound Electron Potential Model (WBEPM) was used to determine the exited-state ionization potential of lithium-like elements for different iso-spectrum series such as 1s2 2p1  P1/2, 1s2 3s2  S1/2 , 1s2 3d2  D1/2, 1s2 4s2  S1/2, 1s2 4p2  P1/2,  and 1s2 4d2  D1/2 having nuclear charges from Z = 3 to Z = 18. On the other hand, to utilize relativistic correction, Briet-Pauli approximation has also been applied to the ionization potential using a fourth-order polynomial expression in the nuclear charge Z. The deviation within the range of 0.1% has been observed between estimated and experimental values that are quite remarkable. Furthermore, new ionization potentials were proposed for iso-series with Z ranging from 19 to 30.
FEATURES OF THE FORMATION OF LOGISTICS EXPENSES OF ENTERPRISES UNDER MILITARY CONDITIONS
Authors: Kulakova Svitlana , Kalembet Alina , Podkopova Daryna
Published: December 2023

The peculiarities of the formation and functioning of logistics activities during the full-scale invasion of Russia into Ukraine were studied.

This article highlights the problems of logistics development in Ukraine during the martial law and the prospects for their solution. Considered the problems faced by the Ukrainian logistics business before the full-scale offensive of the Russian Federation. Logistics costs until February 24, 2022 and after were analyzed, relevant conclusions were drawn, namely the unprofitability of Ukrainian enterprises and their crisis situation.

Attention was also paid to such issues as transportation by land transport and sea vessels - blockade of railways and ports. The consequences of increasing the coefficients of transportation tariffs are highlighted.

Ukraine is one of the world leaders in the export of grain. But due to Russian aggression, the main logistics route for this product — the Black Sea — was blocked. The mentioned aid from Turkey and the creation of the "Grain Corridor", during which the export of Ukrainian grain became possible. The Grain From Ukraine initiative, which was successfully adopted and agreed upon by the President of Ukraine, Volodymyr Zelenskyi, is a project called "Grain from Ukraine", which aims to provide more than five million people with grain by the end of spring 2023. The future of Ukrainian exports of agricultural products will largely depend on the continuation of the "grain agreement".

The problems of Ukrainian ports and railways are identified, and alternative ways of moving transport are given. For cross-border transportation, transit routes with countries such as Poland, Hungary, Moldova, Slovakia, and Romania are used.

The article also mentions business activities in the west, during which investment and fulfillment are increasing. Options for improving the efficiency of logistics supply chains are indicated. It is noted that the situation on the market, both domestic and foreign, changes almost every day, so this trend will continue in the future.

If the situation with the availability of logistics does not improve, not only the Ukrainian agricultural sector will be at risk, but also the macroeconomic stability of the country, as well as global food security.