IDENTIFICATION OF ORGANIC COMPONENTS OF SOLID WASTE ON SATELLITE IMAGERY WHILE MANAGING ENVIRONMENTAL SAFETY

Solid domestic wastes contain a components which can become nutrients for a pretty wide spectrum of types of microorganisms some of which are harmful for human and environment. The climate on territory of Ukraine promotes their intensive reproduction in such conditions. All organisms, including microorganisms, mainly consist of carbon and therefore represent the carbon containing components of waste dumps, namely organic. Monitoring of the conditions of microbiological pollution of urban systems on the territory of which surely there are solid waste damps as part of technogenic and ecological safety of these systems, can take one of main places in ecological safety management systems

The use of porous indium phosphide as substrates supercapacitors – new word in green energy

В работе рассмотрена возможность применения пористого фосфида  индия в качестве материала для создания суперконденсаторов. Предложен метод  по лучения пористых слоев фосфида индия и проанализирована морфология поверхности полученных наноструктур. The paper considers the possibility of using porous indium phosphide as a  material to create supercapacitors . Proposed a method of obtaining porous layers of indium  phosphide and analyzed the surface morphology of the obtained nanostructures

Effect of the type of electrolyte аnion on the porous InP morphology obtained by the electrochemical etching

In this work the analysis of the dependence of the porous InP morphology on the type of reacting anion is presented. It is shown that nanoporous InP layers are obtained under certain conditions of electrochemical etching. При цитуванні документа, використовуйте посилання http://essuir.sumdu.edu.ua/handle/123456789/9352У даній роботі подано аналіз залежності морфології поруватого фосфіду індію від типу аніону що бере участь у реакції пороутворення. Показано, що за певних умов електролітичного травлення, можливе отримання нанопоруватих шарів InP. При цитировании документа, используйте ссылку http://essuir.sumdu.edu.ua/handle/123456789/9352В данной работе представлен анализ зависимости морфологии пористого фосфида индия от типа участвующего в реакции аниона. Показано, что при определенных условиях электролитического травления, получаются нанопористые слои InP. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/935

Забезпечення екологічної безпеки шляхом використання пористих напівпровідників для сонячної енергетики

The paper considers the ways of provision of environmental safety. A scheme of multilevel decomposition of the problems of provision of environmental safety through the use of innovative technologies for solar energy sector is presented. It is demonstrated that it is possible to increase efficiency of photoelectric modifiers of energy through the use of nanostructured semiconductors. The possibilities of minimizing the reflection ability (due to catching light in pores), an increase in the width of the restricted band of porous layer (due to quantum retaining of charges in microcrystallites) due to changing the porosity allow the use of layers of porous semiconductor both as anti-reflecting coating and as a broadband photosensitive layer. Under condition of using nanostructured semiconductors, the sensitivity of solar panels to the surface contamination decreases greatly. The economic benefits of using porous silicon in solar power include low cost of an area unit of a solar battery, which is provided for by the cost parameters of basic technology for manufacturing porous material. The method of electrochemical etching of nanostructures was used to obtain nanostructures. Basic regularities of the formation of porous layer at the surface of semiconductors of the A3V5 group and silicon were established. Technological conditions are selected individually for each semiconductor. The establishment of these regularities allows the optimization of the etching process and the fabrication of porous layers with the assigned parameters. Представлена схема многоуровневой декомпозиции задач обеспечения экологической безопасности путем использования инновационных технологий для солнечной энергетики. Показано, что повышение КПД фотоэлектрических преобразователей энергии становится возможным за счет использования наноструктурированных полупроводников. Для получения наноструктур использовали метод электрохимического травленияПредставлено схему багаторівневої декомпозиції задач забезпечення екологічної безпеки шляхом використання інноваційних технологій для сонячної енергетики Показано, що підвищення ККД фотоелектричних перетворювачів енергії стає можливим за рахунок використання наноструктурованих напівпровідників. Для отримання наноструктур використовували метод електрохімічного травленн

Science in times of crisis: How does the war affect the efficiency of Ukrainian scientists?

This study aims to assess how to prevent the loss of academic potential due to the full-scale war unleashed by Russia on the territory of Ukraine. The paper establishes the relationship between the location of Ukrainian researchers and their ability to engage in scientific activity and determines the factors that decrease scientific efficiency during the war. Moreover, it identifies the influence of the scientists’ place of residence on their scientific efficiency. The sample comprises 172 lecturers from Berdyansk State Pedagogical University, Ukraine. This university was chosen because it was located in the temporarily occupied territory at the beginning of the war and later was relocated to another city. 40.8% of respondents who left the temporarily occupied territory for the Ukraine-controlled territories noted a decrease in the effectiveness of their scientific activities. Furthermore, 33.8% could not think about science at all. The most challenging situation is for those who went abroad: 55.6% show decreased scientific activity, and 27.7% note its complete absence. The most significant reasons that prevent scientific activity are financial instability, lack of access to equipment, loss of relevance of previously started research, inability to concentrate on science, poor quality or lack of Internet, and adaptation to a new residence.--//-- This is an open access article Yana Suchikova, Natalia Tsybuliak, Hanna Lopatina, Liudmyla Shevchenko and Anatoli I. Popov (2023). Science in times of crisis: How does the war affect the efficiency of Ukrainian scientists?. Problems and Perspectives in Management, 21(1), 408-424. doi:10.21511/ppm.21(1).2023.35 published under the CC BY 4.0 licence.The Institute of Solid State Physics, University of Latvia as the Centre of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016- 2017-TeamingPhase2 under grant agreement No. 739508, project CAMART

Ukrainian universities at the time of war: From occupation to temporary relocation

Introduction: This paper presents a deep analysis of the impact of the Russian occupation on the activities of Berdyansk State Pedagogical University in Ukraine. This reflection sheds light on numerous challenges faced by the university community under occupation due to the the Russia’s full-scale war against Ukraine, particularly emphasizing human rights violations and academic freedom. Methods: Utilizing a qualitative research approach, this study employs document analysis, online surveys, and semi-structured interviews. Results: The findings reveal a profound impact of war and occupation on academic and physical freedom. We share the experiences of staff and students during life under occupation, which are filled with fear of violent actions by the occupiers. Berdyansk State Pedagogical University had to adapt to changing conditions, transitioning to a digital educational platform and decentralizing its structure while concurrently fulfilling its third mission: social service and support of the university community and Berdyansk local community.Discussion: Our research-reflective piece calls for immediate intervention and further research toward developing effective strategies to protect the rights of staff and students of higher educational institutions in conditions of war and occupation. We urge the academic community, civil society orgnisations, international orgnisations, and governments to direct their efforts to protect the rights of academic communities during war and occupation. Conclusions provide a critical view of the catastrophic consequences for academic communities and science if timely measures are not taken. Keywords: war, Ukraine, university, occupation, relocation, educational process, scientific work, higher education.Introducción: Este artículo examina el impacto de la guerra en el sistema educativo y analiza la reubicación de las instituciones educativas en zonas neutrales en caso de una amenaza a la seguridad. Específicamente, este artículo examina la experiencia de la Universidad Pedagógica Estatal de Berdyansk durante la invasión militar a gran escala de Ucrania por parte de la Federación Rusa, desde el comienzo de la ocupación hasta su reubicación temporal. Este estudio nos permitirá conocer qué desafíos se presentaron y cómo la universidad, su dirección y docentes los superaron. Objetivo: Este documento tiene como objetivo proporcionar un relato reflexivo de la intervención de las fuerzas de ocupación rusas en la ciudad de Berdyansk y los cambios en la Universidad Pedagógica Estatal de Berdyansk como resultado. Describe las estrategias que se integraron para preservar la vida y la salud de la comunidad universitaria y restablecer el proceso educativo en las condiciones de ocupación de la ciudad de Berdyansk. Resultados: A partir de los datos de la encuesta a estudiantes y personal académico de la universidad, se han realizado conclusiones relacionadas con la actitud de los encuestados ante las situaciones que se presentan en el momento de la guerra a gran escala y la ocupación temporal por parte de las tropas. Bajo ocupación temporal, la universidad tiene como objetivo la misión a la sociedad: el apoyo de la comunidad universitaria en todos los niveles, pero no puede realizar la misión principal: educativa, así como una actividad científica. Conclusiones: Se demostró que para restablecer la actividad universitaria bajo ocupación, los pasos más efectivos son la reubicación temporal por seguridad

Characterization of CdxTeyOz/CdS/ZnO Heterostructures Synthesized by the SILAR Method

The study was supported by the Ministry of Education and Science of Ukraine via Project No. 0122U000129 “The search for optimal conditions for nanostructure synthesis on the surface of A3B5, A2B6 semiconductors and silicon for photonics and solar energy” and Project No. 0121U10942 “Theoretical and methodological bases of system fundamentalization of the future nanomaterials experts training for productive professional activity”. In addition, the research of A.P. and Y.S. was partly supported by COST Action CA20129 “Multiscale Irradiation and Chemistry Driven Processes and Related Technologies” (MultIChem). A.P. thanks to the Institute of Solid-State Physics, University of Latvia. ISSP UL as the Center of Excellence is supported through the Framework Program for European universities, Union Horizon 2020, H2020-WIDESPREAD-01–2016–2017-TeamingPhase2, under Grant Agreement No. 739508, CAMART2 project.CdxTeyOz/CdS/ZnO heterostructures were obtained by the SILAR method using ionic electrolytes. A CdS film was formed as a buffer layer for better adhesion of the cadmium-tellurium oxides to the substrate surface. In turn, the ZnO substrate was previously prepared by electrochemical etching to form a rough textured surface. In addition, an annealing mode was used in an oxygen stream to complete the oxidation process of the heterostructure surface. The resulting nanocomposite was investigated using RAMAN, XRD, SEM, and EDX methods. We assume that the oxides CdO and TeO4 initially form on the surface and later evolve into TeO2 and TeO3 when saturated with oxygen. These oxides, in turn, are the components of the ternary oxides CdTeO3 and CdTe3O8. It should be noted that this mechanism has not been fully studied and requires further research. However, the results presented in this article make it possible to systematize the data and experimental observations regarding the formation of cadmium-tellurium films. © 2023 by the authors.--//-- This is an open access publication Suchikova Y., Kovachov S., Bohdanov I., Popova E., Moskina A., Popov A.; Characterization of CdxTeyOz/CdS/ZnO Heterostructures Synthesized by the SILAR Method (2023) Coatings, 13 (3), art. no. 639; DOI: 10.3390/coatings13030639; https://www.scopus.com/inward/record.uri?eid=2-s2.0-85152654514&doi=10.3390%2fcoatings13030639&partnerID=40&md5=3ea72367de513202fc87a3a5b99df07f published under the CC BY 4.0 licence.Ministry of Education and Science of Ukraine via Project No. 0122U000129 and Project No. 0121U10942; COST Action CA20129; The ISSP UL as the Center of Excellence is supported through the Framework Program for European universities, Union Horizon 2020, H2020-WIDESPREAD-01–2016–2017-TeamingPhase2, under Grant Agreement No. 739508, CAMART2 project

Electrochemical Growth and Structural Study of the AlxGa1−xAs Nanowhisker Layer on the GaAs Surface

The study was supported by the Ministry of Education and Science of Ukraine via Project No. 0122U000129 “The search for optimal conditions for nanostructure synthesis on the surface of A3B5, A2B6 semiconductors and silicon for photonics and solar energy”, Project No. 0121U10942 “Theoretical and methodological bases of system fundamentalization of the future nanomaterials experts training for productive professional activity”, and Project No. 0123U100110 “System of remote and mixed specialized training of future nanoengineers for the development of new dual-purpose nanomaterials”. In addition, the research of A.I.P. and Y.S. was partly supported by COST Action CA20129 “Multiscale irradiation and chemistry driven processes and related technologies” (MultiChem). Y.S. was partly supported by COST Action CA20126—Network for research, innovation, and product development on porous semiconductors and oxides (NETPORE). A.I.P., thanks to the Institute of Solid State Physics, University of Latvia, ISSP UL as the Center of Excellence, is supported through the Framework Program for European Universities, Union Horizon 2020, H2020-WIDESPREAD-01–2016–2017-TeamingPhase2, under Grant Agreement No. 739508, CAMART2 project.This work presents a novel, cost-effective method for synthesizing AlxGa1−xAs nanowhiskers on a GaAs surface by electrochemical deposition. The process begins with structuring the GaAs surface by electrochemical etching, forming a branched nanowhisker system. Despite the close resemblance of the crystal lattices of AlAs, GaAs, and AlxGa1−xAs, our study highlights the formation of nanowhiskers instead of layer-by-layer film growth. X-ray diffraction analysis and photoluminescence spectrum evaluations confirm the synthesized structure’s crystallinity, uniformity, and bandgap characteristics. The unique morphology of the nanowhiskers offers promising implications for solar cell applications because of the increased light absorption potential and reduced surface recombination energy losses. We conclude by emphasizing the need for further studies on the growth mechanisms of AlxGa1−xAs nanowhiskers, adjustments of the “x” parameter during electrochemical deposition, and detailed light absorption properties of the formed compounds. This research contributes to the field of wideband materials, particularly for solar energy applications, highlighting the potential of electrochemical deposition as a flexible and economical fabrication method. --//-- This is an open access article: Suchikova, Y.; Kovachov, S.; Bohdanov, I.; Abdikadirova, A.A.; Kenzhina, I.; Popov, A.I. Electrochemical Growth and Structural Study of the AlxGa1−xAs Nanowhisker Layer on the GaAs Surface. J. Manuf. Mater. Process. 2023, 7, 153. https://doi.org/10.3390/jmmp7050153 published under the CC BY 4.0 licence.Ministry of Education and Science of Ukraine via Project No. 0122U000129, Project No. 0121U10942, Project No. 0123U100110; COST Action CA20129 MultiChem; COST Action CA20126 NETPORE; the Institute of Solid State Physics, University of Latvia, ISSP UL as the Center of Excellence, is supported through the Framework Program for European Universities, Union Horizon 2020, H2020-WIDESPREAD-01–2016–2017-TeamingPhase2, under Grant Agreement No. 739508, CAMART2 project

Statistical evaluation of morphological parameters of porous nanostructures on the synthesized indium phosphide surface

A constructive method for estimating the surface morphology of nanostructured semiconductors, which consists in determining the main statistical characteristics of the aggregate structure of nanoscale objects on their synthesized surface is presented. In terms of the indium phosphide semiconductor with a synthesized porous layer on its surface, it is shown that the evaluation of the main statistical characteristics allows a deeper understanding of the kinetics of the pore formation process during typical electrochemical treatment of the crystal. The determination of the main statistical metrologically based characteristics (indicators of the distribution center, variation, and shape of the distribution) allows us to understand in more detail view the processes occurring during electrochemical processing of crystals. In the long run, this will make it possible to create nanostructures with predetermined properties, which will become the basis for the industrial production of high-quality nanostructured semiconductors

Synthesis of porous indium phosphide with nickel oxide crystallites on the surface

In this paper, the technology of synthesis of crystallites and nanocrystallites of nickel oxide on the surface of indium phosphide is described. This technology consists of two stages. In the first stage, porous indium phosphide is formed on the surface of a single crystal of indium phosphide. The formation of such a porous layer provides better adhesion to the surface of the sample. The second stage involves the preparation of the solution that contains nickel ions, application of this solution to the surface of porous indium phosphide, followed by annealing. As a result, NiO/NiC2O4∙2H2O/por- -InP/mono-InP structure was formed. Surface morphological parameters were obtained using scanning electron microscopy and EDX-analysis of chemical composition. Chemical analysis confirmed the partial formation of nickel oxide from nickel oxalate layer by thermal annealing. Using scanning electron microscopy, it has been established that the crystallites have a large scatter in diameter, but they may be divided into three characteristic groups: macro-; meso- and nano­crystallites. Such structures may find prospects for application in electrochemical capacitors and lithium-ion batteries. Further research is needed for methodology improvement to obtain structures with predetermined controlled properties