149 research outputs found
The Impact of COVID-19 on Higher Education in South Korea
The COVID-19 pandemic forced universities worldwide to switch from face-to-face teaching to online remote teaching. The majority of students are dissatisfied as their college lives are completely ruined, and they are not able to maintain their social networks. South Korean higher education has long been troubled by decreasing tuition revenues, an aging problem, the low-level internationalization of university education, and administrative redundancies, and now the pandemic has greatly aggravated these structural defects. Furthermore, course content creation posed a major challenge to professors, while the lack of student motivation and commitment led to a rapid decline in the quality of education and evaluation. Accordingly, students requested a refund of their tuition fees, or at least compensation, and called for the improvement of online courses
A mezőgazdaságban alkalmazott szemcsés anyagok (vetőmagvak, műtrágyák) fizikai jellemzői, technológiai folyamatban való részvétele = Physical properties and joining in the technological process of the agricultural granula materials (grain and fertilizers)
A mezĹ‘gazdaságban használt szemcsĂ©s anyagok (vetĹ‘magvak, műtrágyák) legfontosabb fizikai jellemzĹ‘inek: mĂ©ret, alak, tĂ©rfogattömeg, sűrűsĂ©g, nedvessĂ©gtartalom, sĂşrlĂłdási jellemzĹ‘k, aerodinamikai tulajdonságok ismerete alapvetĹ‘ fontosságĂş a mezĹ‘gazdasági gĂ©pek pontos tervezĂ©sĂ©nĂ©l, cĂ©lszerű kialakĂtásánál. Ennek megfelelĹ‘en kutatásunk cĂ©lja kĂĽlönbözĹ‘ műtrágyaszemcsĂ©k Ă©s vetĹ‘magvak fizikai jellemzĹ‘inek meghatározása a vetĹ‘-, szĂłrĂł-, betakarĂtĂł-, anyagmozgatĂł-, tisztĂtĂł-, szárĂtĂł-, tárolĂł- stb. berendezĂ©sek Ă©s gĂ©pek fejlesztĂ©sĂ©nek támogatása Ă©rdekĂ©ben. További cĂ©l a fizikai jellemzĹ‘k meghatározásához pontosabb eszközök fejlesztĂ©se, valamint megfelelĹ‘ vizsgálati mĂłdszerek kidolgozása. A vetĹ‘magvak Ă©s műtrágyaszemcsĂ©k fizikai jellemzĹ‘i közĂĽl az alábbiakat vizsgáltuk Ă©s elemeztĂĽk: mĂ©ret, mĂ©reteloszlás, alaki jellemzĹ‘k, tömeg, tĂ©rfogattömeg, sűrűsĂ©g, szilárdsági jellemzĹ‘k, sĂşrlĂłdási jellemzĹ‘k (rĂ©zsűszög, belsĹ‘ sĂşrlĂłdás, sĂşrlĂłdás, kĂĽlönbözĹ‘ felĂĽleten), aerodinamikai jellemzĹ‘k (lebegtetĂ©si sebessĂ©g, lĂ©gellenállási tĂ©nyezĹ‘). Vizsgálataink eredmĂ©nyeit 25 publikáciĂłban -közte 9 angolul-, jelentettĂĽk meg. | The knowledge of the most important physical characteristics: size, shape, density, real density, moisture content, friction characteristics, aerodynamic qualities of granular particles (seeds, fertilisers) used in agriculture is essential in the precise construction and reasonable operation of agricultural machines. Knowing this he aim of our research is the definition of the physical properties of fertiliser particles and various grains with respect to the development of seeding, spreading, harvesting, particle moving, cleaning, drying, storing etc. equipment and machines, as well as to improve the necessary, precise machines needed for the definition of physical properties. Out of the properties we have investigated the following ones: size and size distribution, shape characteristics, mass, density, real density, strength characteristics, friction characteristics (angle of repose, inner friction, friction on various surfaces), aerodynamic properties (terminal velocity, aerodynamic drag coefficient). We have published our research results in 25 publications including 9 in English
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