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http://hdl.handle.net/10261/119
2024-03-19T04:26:16ZEvaluating Reduced Resolution Redundancy for Radiation Hardening in FPGA Designs
http://hdl.handle.net/10261/343035
Título: Evaluating Reduced Resolution Redundancy for Radiation Hardening in FPGA Designs
Autor: García-Astudillo, Luis A.; Lindoso, Almudena; Entrena, Luis A.; Martín, Honorio; García-Valderas, Mario; Martín Holgado, Pedro; Morilla, Yolanda
Resumen: Radiation hardening by design (RHBD) is traditionally performed using triple modular redundancy (TMR), a very effective technique that introduces high overheads in terms of resources and power. The reduced resolution redundancy (RRR) technique presented in this work is a new approximate error mitigation technique that uses redundant circuits with lower resolution to perform computations. In this work, we evaluate this technique under radiation using two different benchmarks implemented in field-programmable gate array (FPGA), namely, a fast Fourier transform (FFT) and an image processing algorithm for a near-infrared (NIR) detector. Experimental results from proton and neutron irradiation, and fault injection campaigns, show that the RRR hardening technique can effectively mitigate errors with reduced overheads.2024-01-22T08:30:03ZIsospin dependence in single-nucleon removal cross sections explained through valence-core destruction effects
http://hdl.handle.net/10261/343030
Título: Isospin dependence in single-nucleon removal cross sections explained through valence-core destruction effects
Autor: Gómez-Ramos, M.; Gómez-Camacho, Joaquín; Moro, A.M.
Resumen: The discrepancy between experimental data and theoretical calculations in one-nucleon removal reactions at intermediate energies (quantified by the so-called “quenching factors”) and its dependence on the isospin asymmetry of the nuclei has been an open problem in nuclear physics for the last fifteen years. In this work, we propose an explanation for this long-standing problem, which relies on the inclusion of the process of core destruction due to its interaction with the removed nucleon. To include this effect, we extend the commonly used eikonal formalism via an effective nucleon density, and apply it to a series of nucleon knockout reactions. The effect of core destruction is found to depend strongly on the binding energy of the removed nucleon, leading to a significant reduction of the cross section for deeply bound nucleons, which reduces the isospin dependence of the “quenching factors”, making them more consistent with the trends found in transfer and (p,pN) reactions.2024-01-22T08:00:17ZGrowth dynamics of nanocolumnar thin films deposited by magnetron sputtering at oblique angles
http://hdl.handle.net/10261/342481
Título: Growth dynamics of nanocolumnar thin films deposited by magnetron sputtering at oblique angles
Autor: Álvarez, Rafael; García-Valenzuela, Aurelio; Regodon, G.; Ferrer, F. J.; Rico, Víctor J.; García-Martín, José Miguel; González-Elipe, Agustín R.; Palmero, Alberto
Resumen: The morphology of numerous nanocolumnar thin films deposited by the magnetron sputtering technique at oblique geometries and at relatively low temperatures has been analyzed for materials as different as Au, Pt, Ti, Cr, TiO, Al, HfN, Mo, V, WO and W. Despite similar deposition conditions, two characteristic nanostructures have been identified depending on the material: a first one defined by highly tilted and symmetric nanocolumnar structures with a relatively high film density, and a second one characterized by rather vertical and asymmetric nanocolumns, with a much lower film density. With the help of a model, the two characteristic nanostructures have been linked to different growth dynamics and, specifically, to different surface relaxation mechanisms upon the incorporation of gaseous species with kinetic energies above the surface binding energy. Moreover, in the case of Ti, a smooth structural transition between the two types of growths has been found when varying the value of the power used to maintain the plasma discharge. Based on these results, the existence of different surface relaxation mechanisms is proposed, which quantitatively explains numerous experimental results under the same conceptual framework.2024-01-16T11:21:49ZSupporting Information Cover Sheet: Transfer of 129I to freshwater fish species within Fukushima Daiichi and Chernobyl exclusion zones
http://hdl.handle.net/10261/340711
Título: Supporting Information Cover Sheet: Transfer of 129I to freshwater fish species within Fukushima Daiichi and Chernobyl exclusion zones
Autor: Teien, Hans-Christian; Wada, Toshihiro; Kashparov, Valery; López-Gutiérrez, J. M.; García-Tenorio, R.; Hinton, Thomas G.; Salbu, Brit
Descripción: 6 pages. -- 1 figure and 2 tables. -- Figure S1. Correlation between concentration of 129I in intestional content and muscle tissues of fish collected in Fukushima waterbody Suzuuchi pond and in Chernobyl waterbodies Glubokoye lake and Staukha lake. -- Table S1. Activity concentration of 137Cs, 129I and 127I, including atomic ratios of 129I with 127I and 137Cs in different tissues of crucian carp (Carassius auratus langsdorfiicarassius) from Suzuuchi pond (n=5). -- Table S2. Fish characteristics and concentration of 129I and 127I in muscle tissue (dry weight) of individual fish collected in Fukushima waterbodies and in Chernobyl waterbodies.2023-12-15T07:35:23Z