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137 results on '"Marcial, José"'

18. Glass structure and crystallization in boro-alumino-silicate glasses containing rare earth and transition metal cations: a US-UK collaborative program

Author

McCloy, John S., Marcial, José, Patil, Deepak, Saleh, Muad, Ahmadzadeh, Mostafa, Chen, Hua, Crum, Jarrod V., Riley, Brian J., Kamat, Hrishikesh, Bréhault, Antoine, Goel, Ashutosh, Barnsley, Kristian E., Hanna, John V., Rajbhandari, Prashant, Corkhill, Claire L., Hand, Russell J., and Hyatt, Neil C.

Published
2019
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22. Micro- and Nanoscale Surface Analysis of Late Iron Age Glass from Broborg, a Vitrified Swedish Hillfort

Author

Matthews, Bethany E, primary, Neeway, James J, additional, Farias, Lorena Nava, additional, Marcial, José, additional, Arey, Bruce W, additional, Soltis, Jennifer, additional, Kovarik, Libor, additional, Zhu, Zihua, additional, Schweiger, Michael J, additional, Canfield, Nathan, additional, Varga, Tamas, additional, Bowden, Mark E, additional, Weaver, Jamie L, additional, McCloy, John S, additional, Sjöblom, Rolf, additional, Hjärthner-Holdar, Eva, additional, Englund, Mia, additional, Ogenhall, Erik, additional, Vicenzi, Edward P, additional, Corkhill, Claire L, additional, Thorpe, Clare, additional, Hand, Russell J, additional, Peeler, David K, additional, Pearce, Carolyn I, additional, and Kruger, Albert A, additional

Published
2023
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24. Effect of network connectivity on behavior of synthetic Broborg hillfort glasses

Author

Marcial, José, primary, Cicconi, Maria Rita, additional, Pearce, Carolyn I., additional, Kloužek, Jaroslav, additional, Neeway, James J., additional, Pokorný, Richard, additional, Vernerová, Miroslava, additional, McCloy, John S., additional, Nienhuis, Emily T., additional, Sjöblom, Rolf, additional, Weaver, Jamie L., additional, Hand, Russell J., additional, Hrma, Pavel, additional, Neuville, Daniel R., additional, and Kruger, Albert A., additional

Published
2022
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29. Effect of network connectivity on behavior of synthetic Broborg hillfort glasses.

Author

Marcial, José, Cicconi, Maria Rita, Pearce, Carolyn I., Kloužek, Jaroslav, Neeway, James J., Pokorný, Richard, Vernerová, Miroslava, McCloy, John S., Nienhuis, Emily T., Sjöblom, Rolf, Weaver, Jamie L., Hand, Russell J., Hrma, Pavel, Neuville, Daniel R., and Kruger, Albert A.

Subjects
*FOAM, *GLASS transition temperature, *GLASS waste, *RADIOACTIVE wastes, *IRON oxidation, *GLASS
Abstract

There is wide industrial interest in developing robust models of long‐term (>100 years) glass durability. Archeological glass analogs, glasses of similar composition, and alteration conditions to those being tested for durability can be used to evaluate and inform such models. Two such analog glasses from a 1500‐year‐old vitrified hillfort near Uppsala, Sweden have previously been identified as potential analogs for low concentration Fe‐bearing aluminosilicate nuclear waste glasses. However, open questions remain regarding the melting environment from which these historic glasses were formed and the effect of these conditions on their chemical durability. A key factor to answering the previous melting and durability questions is the redox state of Fe in the starting and final materials. Past work has shown that the melting conditions of a glass‐forming melt may influence the redox ratio value (Fe+3/∑Fe), a measure of a glass's redox state, and both melting conditions and the redox ratio may influence the glass alteration behavior. Synthetic analogs of the hillfort glasses have been produced using either fully oxidized or reduced Fe precursors to address this question. In this study, the melting behavior, glass transition temperature, oxidation state, network structure, and chemical durability of these synthesized glass analogs is presented. Resulting data suggests that the degree of network connectivity as impacted by the oxidation state of iron impacted the behavior of the glass‐forming melt but in this case does not affect the chemical durability of the final glass. Glasses with a lower degree of melt connectivity were found to have a lower viscosity, resulting in a lower glass transition temperature and softening temperature, as well as in a lower temperature of foam onset and temperature of foam maximum. This lower degree of network connectivity most likely played a more significant role in accelerating the conversion of batch chemicals into glass than the presence of water vapor in the furnace's atmosphere. Future work will focus on using the results from this work with outcomes from other aspects of this project to evaluate long‐term glass alteration models. [ABSTRACT FROM AUTHOR]

Published
2023
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30. Role of Zeolite Structural Properties toward Iodine Capture: A Head-to-head Evaluation of Framework Type and Chemical Composition

Author

Riley, Brian J., primary, Chong, Saehwa, additional, Schmid, Julian, additional, Marcial, José, additional, Nienhuis, Emily T., additional, Bera, Mrinal K., additional, Lee, Sungsik, additional, Canfield, Nathan L., additional, Kim, Sungmin, additional, Derewinski, Miroslaw A., additional, and Motkuri, Radha Kishan, additional

Published
2022
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41. Diseño y fabricación de prótesis mediante tecnologías de prototipado rápido

Author

Sedano Sánchez, Alberto, Aguilar Martín, Juan José, and Dieste Marcial, José Antonio

Abstract

El objetivo principal de este Trabajo de Fin de Grado es el diseño y desarrollo para su fabricación mediante técnicas de prototipado rápido de prótesis transradiales para invidentes, centrado en el caso de un paciente concreto. Las medidas para diseñar dicha prótesis estarán basadas en su fisionomía dada la exclusividad del caso. La prótesis tendrá la capacidad de ser modular para adaptarse a las actividades más relevantes realizadas por el paciente, siendo puramente mecánica; complementará y/o sustituirá las prótesis electrónicas que ya posee el paciente. Para ello se utilizarán métodos de ingeniería inversa e impresión 3D para su máxima adaptación al miembro superior de dicho paciente.

Published
2019

43. Effect of water vapor and thermal history on nuclear waste feed conversion to glass.

Author

Marcial, José, Pokorný, Richard, Kloužek, Jaroslav, Vernerová, Miroslava, Lee, SeungMin, Hrma, Pavel, and Kruger, Albert

Subjects
*RADIOACTIVE wastes, *WATER vapor, *GEOTHERMAL resources, *MOLTEN glass, *CELLULAR glass, *FOAM
Abstract

Water affects the glass melting process by interacting with the foam layer at the glass melt surface and by influencing the batch conversion reactions. Nuclear waste aqueous slurry feed maintains a high water vapor pressure in the melter atmosphere. To investigate to what extent water vapor affects the foaming during vitrification of nuclear waste in joule‐heated cold‐top melters, a series of feed expansion experiments were performed under humid and dry atmospheres using samples of low‐activity waste (LAW) melter feed simulants. Melting of feed pellets in the presence of water vapor slightly decreased the temperature of primary foam onset for an extensively foaming feed, but did not significantly affect the feed volume expansion by foaming or the foam‐collapse temperature. Sets of feed expansion experiments and evolved gas analyses were also performed to check the effect of thermal history on conversion behavior of LAW feed samples. The thermal history was varied by testing feed samples prepared as direct slurry, loose powder, and slow‐ and fast‐dried pellets. The sample preparation methods and the sample shape were not found to influence foaming parameters, except for the direct slurry where the low‐temperature swelling prevented the foam onset and collapse temperatures to be determined. [ABSTRACT FROM AUTHOR]

Published
2021
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