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6. Using Distance Learning to Impact Access of Diverse Learners to Advanced Placement Programs

Author

Fenty, Nicole S. and Allio, Andrea

Abstract

Distance learning has been used as one method to increase access for students who have otherwise been underrepresented in college preparatory courses like Advanced Placement (AP). This study evaluated the impact of a statewide Virtual Advanced Placement (VAP) program on access to AP courses for students from underrepresented populations. Survey and interview data indicate a heavy focus on recruiting students from diverse racial and ethnic backgrounds. However, English language learners and students with disabilities continued to be underrepresented in VAP programs. A discussion of the findings and implications for research and practice are also provided.

Published
2017

7. Development of an equivalent porous medium model for a tubular receiver equipped with Raschig Rings.

Author

Ebadi, Hossein, Allio, Andrea, Cammi, Antonio, and Savoldi, Laura

Subjects
*POROUS materials, *MASS transfer, *HEAT transfer, *NUCLEAR reactors, *ELECTRONIC equipment, *COST control, *SOLAR power plants
Abstract

The porous insert has become one of the promising methods for heat transfer enhancement in many industrial applications ranging from small electronic devices to nuclear reactors, and large solar fields. For the assessment of such systems, the CFD numerical studies are usually employed by scientists to investigate the heat and mass transfer inside the region in micro or macro scales. Although micro studies are accurate and provide a detailed analysis of the process, they cannot be used for every study due to complex and costly computational resource they may demand for the case under study. Therefore, sometimes macro-scale simulations become more favorable thanks to the reduction in time and cost as well as the simplification over the morphology of the porous medium they offer. For these reasons, this study aims at developing a macro model for a novel porous disc made of Raschig Rings, to be applied to the tubular solar absorber for future simulations. The methodology devised in this study was to exploit detailed micro-scale simulations, achieving the macro properties and then developing a new equivalent macro model of a porous medium, based on the obtained properties. Numerical data indicated that when the developed macro model is compared to the micro simulations, the thermo-hydraulic results are in good agreement. Applying the macro model to a solar absorber working under linear Fresnel heating showed that the proposed porous disc could reduce the temperature rise on the tube wall by 40%. [ABSTRACT FROM AUTHOR]

Published
2023
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8. Assessment of the Performance of Different Cooling Configurations for the Launcher Mirrors of the ECRH System of the DTT Facility

Author

Allio, Andrea, primary, Bruschi, Alessandro, additional, Busi, Daniele, additional, Bussolan, Andrea, additional, Fanale, Francesco, additional, Fanelli, Pierluigi, additional, Garavaglia, Saul, additional, Giorgetti, Francesco, additional, Romano, Afra, additional, Salvitti, Alessandra, additional, and Savoldi, Laura, additional

Published
2022
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10. Progress on TH1509U 170 GHz 1 MW European Gyrotron Program

Author

Leggieri, Alberto, primary, Albajar, Ferran, additional, Alberti, Stefano, additional, Allio, Andrea, additional, Avramidis, Kostantinos A., additional, Bariou, David, additional, Bin, William, additional, Bruschi, Alex, additional, Chelis, Ioannis, additional, Difonzo, Rosa, additional, Fanale, Francesco, additional, Gantenbein, Gerd, additional, Goodman, Tim, additional, Hogge, Jean-Philippe, additional, Illy, Stefan, additional, Ioannidis, Zisis, additional, Jelonnek, John, additional, Jin, Jianbo, additional, Latsas, George, additional, Legrand, François, additional, Lietaer, Gerald, additional, Lievin, Christophe, additional, Marchesin, Rodolphe, additional, Rzesnicki, Tomasz, additional, Sanchez, Francisco, additional, Savoldi, Laura, additional, Stanculovic, Sebastian, additional, Tigelis, Ioannis, additional, Torreblanca, Humberto, additional, and Thumm, Manfred, additional

Published
2022
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11. TH1509U European 170 GHZ 1 MW CW Industrial Gyrotron Upgrade

Author

Leggieri, Alberto, Bariou, David, Hermann, Virgile, Legrand, Francois, Lietaer, Gerald, Lievin, Christophe, Marchesin, Rodolphe, Thouvenin, Philippe, Albajar, Ferran, Sanchez, Francisco, Avramidis, Kostantinos A., Gantenbein, Gerd, Illy, Stefan, Ioannidis, Zisis, Jelonnek, John, Jin, Jianbo, Pagonakis, Ioannis Gr, Rzesnicki, Tomasz, Thumm, Manfred, Alberti, Stefano, Hogge, Jean-Philippe, Allio, Andrea, Difonzo, Rosa, Savoldi, Laura, Chelis, Ioannis, Tigelis, Ioannis, Latsas, George, Bin, William, Bruschi, Alex, and Fanale, Francesco

Subjects
Technology, gyrotron, ech&cd, millimeter waves, ddc:600
Abstract

This paper describes the status on the upgrade of the first European gyrotron prototype for ITER, manufactured by Thales. The upgraded prototype, TH1509U, is now being tested to verify the performance improvements and to assess the compliance with ITER ECRH requirements.

Published
2022

15. TH1509U European 170 GHZ 1 MW CW Industrial Gyrotron Upgrade

Author

Leggieri, Alberto, primary, Bariou, David, additional, Hermann, Virgile, additional, Legrand, Francois, additional, Lietaer, Gerald, additional, Lievin, Christophe, additional, Marchesin, Rodolphe, additional, Thouvenin, Philippe, additional, Albajar, Ferran, additional, Sanchez, Francisco, additional, Avramidis, Kostantinos A., additional, Gantenbein, Gerd, additional, Illy, Stefan, additional, Ioannidis, Zisis, additional, Jelonnek, John, additional, Jin, Jianbo, additional, Pagonakis, Ioannis Gr., additional, Rzesnicki, Tomasz, additional, Thumm, Manfred, additional, Alberti, Stefano, additional, Hogge, Jean-Philippe, additional, Allio, Andrea, additional, Difonzo, Rosa, additional, Savoldi, Laura, additional, Chelis, Ioannis, additional, Tigelis, Ioannis, additional, Latsas, George, additional, Bin, William, additional, Bruschi, Alex, additional, and Fanale, Francesco, additional

Published
2021
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17. READERS WRITE

Author

Bethea, Sally, Sherwood, Steve, Noe, Denise, Monahan, Jane, Allio, Andrea E., Richards, Thomas, and Carpenter, Kimball I.

Subjects
General interest, News, opinion and commentary
Abstract

Cumberland on road to ruin More than 25 years ago, I spent Thanksgiving Day camping on Cumberland Island, the largest undeveloped island on the East Coast. Experiences such as this [...]

Published
2004

19. Two-fluid modelling for poly-disperse bubbly flows in vertical pipes: Analysis of the impact of geometrical parameters and heat transfer

Author

Allio, Andrea, Buffo, Antonio, Marchisio, Daniele, and Savoldi, Laura

Abstract

The bubbly flow of air or steam in subcooled water are investigated here in several test cases, characterized by different pipe sizes, bubble dimensions and flow rates, by means of CFD using a Eulerian-Eulerian approach. The performance of models that differ for the turbulence closure in the continuous phase, as well as for the description of the lift force on the dispersed phase, are compared in detail. When air is considered, the space of the experimental parameters leading to a reasonable performance for the selected models are identified and discussed, while the issues left in the modelling of the concurrent condensation are highlighted for the cases where steam is used.

Published
2022
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20. Assessment of the Performance of Different Cooling Configurations for the Launcher Mirrors of the ECRH System of the DTT Facility

Author

Andrea Allio, Alessandro Bruschi, Daniele Busi, Andrea Bussolan, Francesco Fanale, Pierluigi Fanelli, Saul Garavaglia, Francesco Giorgetti, Afra Romano, Alessandra Salvitti, Laura Savoldi, Allio, Andrea, Bruschi, Alessandro, Busi, Daniele, Bussolan, Andrea, Fanale, Francesco, Fanelli, Pierluigi, Garavaglia, Saul, Giorgetti, Francesco, Romano, Afra, Salvitti, Alessandra, and Savoldi, Laura

Subjects
Electromagnetic heating, Nuclear and High Energy Physics, Mirrors, Cooling, Heating systems, Spirals, Plasma temperature, Plasmas, microwave technology, mirrors, simulations, temperature control, Astrophysics::Instrumentation and Methods for Astrophysics, Cooling, microwave technology, mirrors, simulations, temperature control, Condensed Matter Physics, Physics::Plasma Physics
Abstract

The launcher mirrors will allow the injection of microwave power from the gyrotrons in the plasma of the Divertor Tokamak Test facility, under construction in Italy. The active cooling of the elliptical M1 (curved and not-steerable) and M2 (flat and steerable) mirrors, both subject to a significant heat load, is investigated in this article. Several cooling solutions are analyzed: a spiral cooling for M1, both in a massive and in a lightened configuration, and also a radial-azimuthal cooling for M2, both in a massive and in a lightened configuration. Figures of merit are computed for the different configurations.

Published
2022
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