162 research outputs found
Ecological and economic efficiency of growing on dark gray soils of bean-cereal grasses
No full textSaabunud / Received 02.05.2022 ; Aktsepteeritud / Accepted 14.07.2022 ; Avaldatud veebis / Published online 14.07.2022 ; Vastutav autor / Corresponding author: Yevheniia Butenko ; [email protected] efficiency of growing leguminous and cereal
agrophytocenoses (Trifolium pratense and Medicago sativa sown with the
addition of Bromus inermis, Lolium multiflorum, Festuca rubra),
highlighted their economic and energy advantages over cereal grasses. The
article presents the results of the study of the influence of grass mixtures
on the main indicators of the efficiency of growing sowing phytocenoses
during haymaking in the Carpathians on dark grey soil. Growing
agrophytocenoses without mineral fertilizers ensures the maintenance of
370–520 € ha–1 of net profit, with the profitability of 151–187%, the cost
of 1 ton of feed units – 56.7–66.7 €, bioenergy coefficient – 2.5–2.9,
energy efficiency ratio – 5.8–6.5 and energy consumption per 1 ton of feed
units – 4.0–4.7 GJ. The cultivation of alfalfa-cereal grasses is ensured on
dark-wet soil with three years of use of the best indicators of economic
and energy efficiency. It was found that on both experimental bean–cereal
grasses the highest efficiency is maintained when P60K60 is applied in
combination with inoculation of seeds of bean strains of nodule bacteria
Structural Characterization and Functional Properties of Epoxy/Graphite Composites for Fuel Cell Bipolar Plates
No full textTitle: Structural Characterization and Functional Properties of Epoxy/Graphite Composites for Fuel Cell Bipolar Plates Author: Mgr. Alina Madalina Darabut Department: Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University Supervisor: Mgr. Yevheniia Lobko, Ph.D., Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University Advisor: Prof. RNDr. Vladimír Matolín, DrSc., Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University Abstract: Bipolar plates are crucial components in proton exchange membrane fuel cells, impacting performance, cost, and weight. Polymer composites are promising materials due to their lightweight nature, cost-effectiveness, and tunable electrical, thermal, mechanical, and gas barrier properties. This thesis focuses on developing epoxy resin/graphite composites for bipolar plates, investigating filler conductivity, polymer- filler interactions, and composite formulation strategies. The first chapter examines the synthesis of thermally expanded graphite and its temperature-dependent morphology, chemical structure, and electrical and thermal conductivity. The findings identify an optimal expansion temperature to maximize conductivity and structural integrity, leading to..
Advanced Iridium-Based Catalysts: Design and Characterization for Unitized Regenerative Fuel Cells and Water Electrolyzers
No full textTitle: Advanced Iridium-Based Catalysts: Design and Characterization for Unitized Regenerative Fuel Cells and Water Electrolyzers. Author: Mgr. Lucinda Blanco Redondo. Department: Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University. Supervisor: Mgr. Yevheniia Lobko, Ph.D. Abstract: Developing efficient and durable bifunctional catalysts is essential for advancing hydrogen production and energy storage technologies, including Proton Exchange Membrane Water Electrolyzers (PEMWE) and Unitized Regenerative Fuel Cells (URFCs). This doctoral thesis investigates iridium-based catalysts, focusing on iridium-decorated platinum nanoparticles for URFCs and titanium-supported iridium nanoparticles for PEMWEs. Iridium-decorated platinum nanoparticles with several Ir-to-Pt ratios (Ir10/Pt90, Ir20/Pt80, and Ir40/Pt60) were studied to determine the catalyst composition that optimizes the performance for oxygen reduction (ORR) and evolution reactions (OER). Among these, Ir40/Pt60 exhibited the highest OER mass activity (571.4 mA mgIr⁻¹), while Ir20/Pt80 demonstrated enhanced bifunctional efficiency (57.7%), making it the most promising URFC catalyst. For PEMWEs, iridium nanoparticles supported on TiO2, TiC, and TiN were evaluated. Ir/TiO2 and Ir/TiC achieved improved OER..
Strukturální charakterizace a funkční vlastnosti epoxidových/grafitových kompozitů pro bipolární desky palivových článků
No full textTitle: Structural Characterization and Functional Properties of Epoxy/Graphite Composites for Fuel Cell Bipolar Plates Author: Mgr. Alina Madalina Darabut Department: Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University Supervisor: Mgr. Yevheniia Lobko, Ph.D., Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University Advisor: Prof. RNDr. Vladimír Matolín, DrSc., Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University Abstract: Bipolar plates are crucial components in proton exchange membrane fuel cells, impacting performance, cost, and weight. Polymer composites are promising materials due to their lightweight nature, cost-effectiveness, and tunable electrical, thermal, mechanical, and gas barrier properties. This thesis focuses on developing epoxy resin/graphite composites for bipolar plates, investigating filler conductivity, polymer- filler interactions, and composite formulation strategies. The first chapter examines the synthesis of thermally expanded graphite and its temperature-dependent morphology, chemical structure, and electrical and thermal conductivity. The findings identify an optimal expansion temperature to maximize conductivity and structural integrity, leading to...Název práce: Strukturální charakterizace a funkční vlastnosti epoxidových/grafitových kompozitů pro bipolární desky palivových článků Autor: Mgr. Alina Madalina Darabut Katedra / Ústav: Katedra fyziky povrchů a plazmatu, Matematicko-fyzikální fakulta, Univerzita Karlova Vedoucí: Mgr. Yevheniia Lobko, Ph.D., Katedra fyziky povrchů a plazmatu, Matematicko-fyzikální fakulta, Univerzita Karlova Konzultant: Prof. RNDr. Vladimír Matolín, DrSc., Katedra fyziky povrchů a plazmatu, Matematicko-fyzikální fakulta, Univerzita Karlova Abstrakt: Bipolární desky jsou klíčovými součástmi palivových článků s protonově vodivou membránou, které ovlivňují jejich výkon, náklady a hmotnost. Polymerní kompozity představují perspektivní materiály díky své nízké hmotnosti, ekonomické dostupnosti a možnosti ladění jejich elektrických, tepelných, mechanických a plynotěsných vlastností. Předložená dizertační práce se zaměřuje na vývoj kompozitních materiálů na bázi epoxidové pryskyřice a grafitu pro bipolární desky a zkoumá vodivost plniva, interakce polymeru s plnivem a strategie formulace kompozit. První kapitola se věnuje syntéze tepelně expandovaného grafitu a analýze jeho teplotně závislé morfologie, chemické struktury, a elektrické a tepelné vodivosti. Výsledky identifikují optimální teplotu expanze pro maximalizaci vodivosti a...Katedra fyziky povrchů a plazmatuDepartment of Surface and Plasma ScienceMatematicko-fyzikální fakultaFaculty of Mathematics and Physic
Розвиток педагогічної освіти і науки у Ніжинській вищій школі
No full textThe contribution of Nizhyn Higher School to the development of pedagogical science is analyzed in the article. The author distinguishes four periods of this process. The first period is from 1805 to 1875. It covers the activity of Count Bezborodko’s Gymnasium of Higher sciences, Physical and Mathematical and Law Lyceums. Elaboration of the Gymnasiem’s and Lyceums’ Charters and determination of the aims, content and methods of teaching and upbringing in secondary and higher schools took place. Attention is drawn to the pedagogical views of I. C. Orlay. The second period (1875–1920) covers the activity of the Institute of History and Philology. The author analyzes training of teachers of history and language and the contribution of its lecturers and graduates to the pedagogical science (M. O. Lavrovsky, O. F. Muzychenko, M. F. Dadenkov, M. I. Demkov). The third period (1920–1991) – the Soviet period. During this time the Institute of History and Philology was reorganized into a research institute (1920–1921), then into an institute of public education (1921–1930), into an institute of social education (1930– 1933), and since 1933 – into a pedagogical institute. The department of pedagogy was established in 1922. The author shows its impact on the development of pedagogical education. The activities of the department in the pre-war and post-war periods are also analyzed. The most prominent graduates of this period were T. F. Bugaiko, Y. K. Kasianenko, I. A. Korovay, O. V. Tkanko, M. I. Burda, A. P. Gryschenko, S. V. Kyrylenko. The forth period (from 1991 to the present time). The pedagogical institute is transformed into a classical university. The author minutely analyzes the activity of the pedagogical department in this period: implementation of integrated research themes “Ways of Improving Pedagogical Mastery of Teachers” and “The Development of Pedagogical Ideas and Education in Ukraine in the 19 th –20 th ”; publication of textbooks for secondary school and university; preparation of dissertations; establishment and development of the scientific school of the history of pedagogy; organization of international and all-Ukrainian theoretical and practical conferences; establishment ofscientific cooperation with institutions of the NAPS of Ukraine, higher educational institutions of Ukraine and foreign countries.У статті аналізується внесок Ніжинської вищої школи у розвиток педагогічної науки й освіти. Автор виділяє чотири періоди цього процесу. І період від 1805 до 1875 рр. Цей період охоплює діяльність Гімназії вищих наук кн. Безбородька, фізико-математичного і юридичного ліцеїв. Відбувається розробка статутів Гімназії і ліцеїв, визначення мети, змісту, принципів і методів організаціїнавчально-виховного процесу у середній і вищій школі. Акцентується увага на педагогічних поглядах І. С. Орлая. ІІ період – з 1875 до 1920 рр. – існування історико-філологічного інституту. Проаналізовано підготовку вчителів історії та словесності, розкрито внесок у педагогічну науку його викладачів та випускників, зокрема М. О. Лавровського, О. Ф. Музиченка, М. Ф. Даденкова, М. І. Демкова. ІІІ період – з 1920 до 1991 року – радянський період. В цей час було реорганізовано історико-філологічний інститут у науково-дослідний (1920–1921), в інститут народної освіти (1921–1930), інститут соціального виховання (1930–1933) і з 1933 – у педагогічний інститут. Кафедра педагогіки була створена у 1922 році. Автор показує її вплив на розвиток педагогічної освіти. Окремо проаналізовано діяльність кафедри в довоєнний та післявоєнний періоди. Представлено також найвидатніших випускників цього періоду (Т. Ф. Бугайко, Є. К. Касьяненко, І. А. Коровай, О. В. Тканко, М. І. Бурда, А. П. Грищенко, С. В. Кириленко).ІV період – з 1991 по теперішній час: зміна статусу – від педагогічного інституту до класичного університету. Автор детально аналізує діяльність кафедри педагогіки в цей час: виконання комплексних наукових тем "Шляхи вдосконалення педагогічної майстерності вчителя" та "Розвиток педагогічної думки та освіти в Україні у ХІХ –ХХІ ст."; видання навчальних посібників для середньої школи та університету, підготовка дисертаційних робіт, становлення та розвиток історико-педагогічної наукової школи, проведення науково-практичних конференцій міжнародного та всеукраїнського рівнів, встановлення наукових зв’язків з установами НАПН України, вишами України та зарубіжжя
Growth of nanoparticles in liquid medium using magnetron sputtering technique
No full textNázev práce: Růst nanočástic v kapalném prostředí technikou magnetronového naprašování Autor: Josef Kučera Katedra / Ústav: Katedra fyziky povrchů a plazmatu Vedoucí bakalářské práce: Mgr. Yurii Yakovlev, Ph.D., Katedra fyziky povrchů a plazmatu Abstrakt: Tato práce zkoumá přípravu nanočástic platiny a platino-rutheniové slitiny pomocí metody magnetronového naprašování na kapalný substrát. Jako použitý kapalný substrát byl zvolen polypropylenglykol se třemi různými molekulárními hmotnostmi 425, 1000 a 4000. U těchto substrátů bylo prozkoumáno, jak jejich rozdílná viskosita ovlivňuje velikost a morfologii nanočástic připravených v magnetronu. Pro určení velikosti nanočástic byly využity metody dynamického rozptylu světla a transmisní elektronové mikroskopie. Dále byla prozkoumána katalytická aktivita vytvořených nanočástic v alkalickém prostředí pomocí techniky rotační diskové elektrody. Klíčová slova: Nanočástice, magnetronové naprašování, polypropylenglykol, vodíkové palivové články, elektrolyzéry vody, vodíkové redoxní reakce.Title: Growth of nanoparticles in liquid medium using magnetron sputtering technique Author: Josef Kučera Department: Department of Surface and Plasma Science Supervisor: Mgr. Yurii Yakovlev, Ph.D., Department of Surface and Plasma Science Abstract: This thesis investigates the preparation of platinum and platinum-ruthenium alloy nanoparticles using magnetron sputtering method on a liquid substrate. Polypropylene glycol with three different molecular weights of 425, 1000, and 4000 was chosen as the liquid substrate. The influence of the different viscosities of these substrates on the size and morphology of the nanoparticles produced in the magnetron was investigated. Dynamic light scattering and transmission electron microscopy methods were used to determine the size of the nanoparticles. Furthermore, the catalytic activity of the produced nanoparticles in an alkaline environment was investigated using the rotating disk electrode technique. Keywords: Nanoparticles, Magnetron Sputtering, Polypropylene glycol, Hydrogen Fuel Cells, Water Electrolyzers, Hydrogen oxidation/reduction reactions.Department of Surface and Plasma ScienceKatedra fyziky povrchů a plazmatuMatematicko-fyzikální fakultaFaculty of Mathematics and Physic
Laimės samprata Makso Frajaus romane Geltonojo metalo raktas: Hamletas ir Sidhartha
No full textThis article explores the motif of an ‘(un)happy prince’ as it is manifested through the evocation of Hamlet’s and Siddhartha’s imagery within Max Frei’s novel The Key of Yellow Metal (2009). The research offers an in-depth analysis of the functioning of these references within the broader intertextual landscape of the novel, placed within the Vilnius narrative. The theme of the happy prince\u27s perception of human suffering is entwined with the topoi of hell and paradise, as well as home or lost paradise. Traditional imagery plays a pivotal role in shaping the concept of inspiration and madness as dynamic forces that exert a profound influence on the surrounding world, counterbalancing the notion of eternal suffering. The shift of focalization allows us to reconsider Sartre’s idea of ‘Hell is other people’. The paper emphasizes the role of the author as a narrator/reteller of well-known stories and tales, both for the author as an actual person and as a literary mystification. The article demonstrates the transformation of the fairy-tale notion of ‘happiness’ into the concept of acquiring meaning as a prerequisite of the main character’s individuation.Šiame straipsnyje nagrinėjamas „(ne)laimingo princo“ motyvas, atpažįstamas Makso Frajaus romano „Geltonojo metalo raktas“ (2009) Hamleto ir Sidharthos personažuose, lygia greta detaliai analizuojamas šių tapatumų funkcionavimas plačioje ir intertekstualioje Vilniaus naratyvo erdvėje. Pasakojimas apie tai, kaip laimingas princas suvokia žmogaus kančią, susipina su pragaro ir rojaus, taip pat namų ar prarasto rojaus toposais. Svarbiausių tradicinių įvaizdžių dėka romane kuriama įkvėpimo ir beprotybės tema. Pastarieji atsiskleidžia kaip dinamiškos jėgos, darančios didžiulę įtaką visam supančiam pasauliui taip subalansuojant amžinosios kančios sampratą. Fokalizacijos pokytis leidžia iš naujo apmąstyti Sartre’o idėją, kad „Pragaras – tai kiti“. Straipsnyje pabrėžiamas autoriaus, gerai žinomų istorijų ir pasakų naratoriaus/pasakotojo vaidmuo, kai autorius suprantamas ir kaip realus asmuo, ir kaip literatūrinė mistifikacija. Straipsnyje parodoma, kaip pasakiškos „laimės“ sąvoka virsta prasmės įgijimo konceptu ir tampa būtina sąlyga herojaus individualizacijos kelyje
Напрями розвитку навичок тайм-менеджменту у здобувачів вищої освіти в процесі професійної підготовки
No full textThe article highlights the peculiarities of developing time management skills for modern professionals. It is also analyzed that success in educational activities depends on successful time planning by students. The basic concepts on which the use of time planning technologies is based are defined. The article contains the author's own interpretation of the directions of development of time management skills in higher education students in the process of professional training.Висвітлено особливості розвитку навичок тайм-менеджменту для сучасних фахівців. Також проаналізовано, що успішність в навчальній діяльності залежить від вдалого планування часу студентами. Визначено базові концепції, на яких ґрунтується застосування технологій планування часу. Стаття містить авторське трактування напрямів розвитку навичок тайм-менеджменту у здобувачів вищої освіти в процесі професійної підготовки
E-catalogue «Periodicals» Database of V. O. Sukhomlynskyi State Scientific and Pedagogical Library of Ukraine: Experience of Formation and Prospects of Development
No full textThe article presents one of the areas of information and bibliographic activity of Sukhomlynsky State Scientific and Pedagogical Library of Ukraine - the formation of «Periodicals» e-database. This resource reveals the content of the contemporary periodicals library stock and serves as a guide in searching documents published on the pages of periodicals. Organizational bases, principles and process of database formation are studied. The author emphasizes a number of tasks concerning modernization of the resource, the solution of which can provide for potential of the database technological platform - IRBIS-64 Library Automation System (LAS). Carrying out tasks will make it possible to improve the quality and efficiency of the automatized analytical-synthetic processing of periodicals and the level of bibliographic service of readers considerably
Trauma and Fairy Tales in Lonely Castle in the Mirror by Mizuki Tsujimura
No full textThis article deals with the metaphoric representation of childhood traumatic experiences through references to European fairy tales in the novel Lonely Castle in the Mirror by Mizuki Tsujimura, “an innovative and tender blend of social commentary and magical realism” as defined by Riyoko Shibe. The paper traces the different ways the author incorporates European fairy tales and introduces the fantastic to describe the traumatic experiences of the children who went through severe bullying at school. The article attempts to demonstrate that these references serve both as symbolic representations of these experiences and as an escape from them, as they provide a metaphorical means to deal with the psychological distress.IAFOR Journal of Literature and Librarianship, 12(1), pp.67-80; 2023journal articl
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