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Abstract

Cloud-based computational environments can offer elastic and flexible services to wide audiences. Małopolska Educational Cloud was originally developed to support the day-to-day collaboration of geographically scattered schools with universities which organized online classes, led by university teachers, as an amendment to face-to-face teaching. Due to the centralized management and ubiquitous access, both the set of services provided by MEC and their usage patterns can be adjusted rapidly. In this paper we show how – during the COVID-19 pandemic – the flexibility of Małopolska Educational Cloud was leveraged to speed up the transition from in-class to remote teaching, both in the classes and schools which were already involved in the MEC project, and newly added ones. We also discuss the actions that were required to support the smooth transition and draw conclusions for the future.
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Bibliography

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  17.  C.M. Toquero, “Challenges and opportunities for higher education amid the COVID-19 pandemic: The Philippine context,” Pedag. Res., vol. 5, no. 4, 2020.
  18.  K.H. Mok, W. Xiong, G. Ke, and J.O.W. Cheung, “Impact of COVID-19 pandemic on international higher education and student mobility: Student perspectives from mainland China and Hong Kong,” Int. J. Educ. Res., vol. 105, p. 101718, 2021.
  19.  S.P. Becker, R. Breaux, C.N. Cusick, M.R. Dvorsky, N.P. Marsh, E. Sciberras, and J.M. Langberg, “Remote learning during COVID-19: Examining school practices, service continuation, and difficulties for adolescents with and without attention-deficit/hyperactivity disorder,” J. Adolesc. Health, vol. 67, no. 6, pp. 769–777, 2020.
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Authors and Affiliations

Łukasz Czekierda
1
Filip Malawski
1
Robert Straś
1
Krzysztof Zieliński
1
ORCID: ORCID
Sławomir Zieliński
1

  1. AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland
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Abstract

Heat transfer augmentation has become the utmost industrial desire. Turbulence promoters seems to be a better option for better heat transfer but at the expense of enormous pressure drop. In the current study, experimental optimization of heat transfer and pressure drop in various configurations of ribbed and corrugated surfaces on the bottom wall of the Solar Air Heater channel, having aspect ratio of 26:5 was performed. The results were evaluated in terms of enhancement in heat transfer (Nu/Nu s), friction factor ratio (f/f s) and thermal performance factor ( η). Three different cases and nine configurations with a pitch to rib/corrugation height ratio of 4.0 were studied. Case A consists of a smooth, continuous square rib, inline and staggered broken ribs. Case B comprises 30°, 45°, 60° and 90° trapezoidal corrugated geometries while Case C is the comparison of smooth, wavy corrugated and the best configurations of cases A and B. The results show that rectangular duct with staggered broken ribs and trapezoidal corrugation at 45° are the best configurations for case A and B, respectively. The 45° corrugated configuration is the best one amongst all, with values of 1.53, 1.5 and 1.33% for Nu/Nu s, f/f s and η respectively.
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Authors and Affiliations

Waseem Siddique
1
Aneeq Raheem
1
Muhammad Aqeel
2
Sualeh Qayyum
2
Tareq Salamen
3
Khalid Waheed
2
Kamran Qureshi
1

  1. Department of Mechanical Engineering, Pakistan Institute of Engineering & Applied Sciences, Nilore, Islamabad, Pakistan
  2. Department of Nuclear Engineering, Pakistan Institute of Engineering & Applied Sciences, Nilore, Islamabad, Pakistan
  3. Sustainable and Renewable Energy Engineering Department, University of Sharjah, United Arab Emirates
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Abstract

The paper presents a numerical analysis carried out to determine the influence of the ground surface fire on the strain level of shelter housing with the ground cover. It is assumed that the underground shelter is longitudinal and the fire spans on an extensive area. The area surrounding the housing was treated as a material with average constant thermodynamic values. The heating and cooling processes were described on the basis of the Fourier’s equation concerning heat conduction in consideration on material, ground and concrete heterogeneous nature. The numeric analysis was carried out in two stages. In the first stage, a quasi-stationary initial temperature distribution was sought in the ground centre and shelter shield. In the second stage of analysis, the fire effect was considered according to the time profile of temperature variation in object.
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Authors and Affiliations

Adam Baryłka
1
ORCID: ORCID

  1. Centre of Construction Expertise, Warsaw, Poland
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Abstract

The article describes how different friction coefficients under certain cutting conditions and parameters affect the formation of the stress-strain and thermal states of the product when titanium alloy machining. A new research methodology is used for the study. Firstly, in the initial data for simulation, each time a different declared coefficient of friction is proposed, and every such task of the cutting process modelling is solved for various cutting parameters. The second stage analyzes how these coefficients influence the stress-strain and thermodynamic state of the workpiece and tool during cutting, as well as the tool wear dynamics. In the third stage of the study, ways for ensuring these analytically-grounded tribological cutting conditions are proposed. The analysis of different wear criteria in the simulation models of titanium alloys cutting is carried out. Experimental studies confirm simulation results.
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Authors and Affiliations

Vadym Stupnytskyy
1
ORCID: ORCID
Xianning She
1
ORCID: ORCID

  1. Lviv Polytechnic National University, Lviv, Ukraine

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