723 research outputs found
Numerical assessment of a Tension-leg platform wind turbine in intermediate water using the Smoothed Particle Hydrodynamics method
No full textThe open-source code DualSPHysics, based on the Smoothed Particle Hydrodynamics method for solving fluid mechanics problems, defines a complete numerical environment for simulating the interaction of floating structures with ocean waves, and includes external libraries to simulate kinematic- and dynamic-type restrictions. In this work, a full validation of the SPH framework using experimental data available for an experimental test campaign on a 1:37-scale floating offshore wind turbine tension-leg platform (TLP) is presented. The first set of validation cases includes a surge decay test, to assess the quality of the fluid–solid interaction, and regular wave tests, which stimulate the mooring system to a large extent. During this phase, tendons (tension legs) that are simulated by MoorDyn+ are validated. Spectral comparison shows that the model is able to capture the surge and pitch dynamic amplification that occurs around the resonant fundamental mode of vibration. This work concludes with a numerical investigation that estimates the response of TLP under extreme events defined using multiple realizations of irregular sea states; the results suggest that the tendon loads are sensitive to the sea-state realization, providing maximum tendon peak forces in a range of ±10% about the mean. Furthermore, it is shown that the load pattern that forms from considering the relative position of the tendons to the incident wave direction leads to higher forces (≈20%)
Performance assessment of a planing hull using the smoothed particle hydrodynamics method
No full textComputational Fluid Dynamics simulations of planing hulls are generally considered less reliable than simulations of displacement hulls. This is due to the flow complexity around planing hulls, especially in the bow region, where the sprays are formed. The recent and constant increasing of computational capabilities allows simulating planing hull features, with more accurate turbulence models and advanced meshing procedures. However, mesh-based approaches based on the finite volume methods have shown to be limited in capturing all the phenomena around a planing hull. As such, the focus of this study is on evaluating the ability of the Smoothed Particle Hydrodynamics mesh-less method to numerically solve the 3-D flow around a planing hull and simulate more accurately the spray structures, which is a rather challenging task to be performed with mesh-based tools. A novel application of the DualSPHysics code for simulating a planing hull resistance test has been proposed and applied to the parent hull of the Naples warped planing hull Systematic Series. The drag and the running attitudes (heave and dynamic trim angle) are computed for a wide range of Froude’s numbers and discussed concerning experimental values
Norberto González Crespo: entre el trabajo de campo y la docencia. 1 Año 1 (2014) enero-marzo. Rutas de Campo. Estudiosos de Guerrero: Semblanzas
No full textÁlvarez, Ticul, “Informe del recorrido de superficie en el territorio de Baja California”, México, Archivo del Departamento de Prehistoria, 1965.Antúnez, María Cristina, Silvia Garza y Rafael Gutiérrez, “La ruta de Colón”, en Tamoanchán. Una crónica de historia regional, Cuernavaca, Centro Regional Morelos-INAH/SEP/ Diario El Regional del Sur, 9 de octubre de 1988.Cornwall, Ian, “Estudios estratigráficos en la carretera México-Puebla”, México, Archivo del Departamento de Prehistoria, 1966.Garza, S. y C. Alvarado, “Guía práctica, Xochicalco, Morelos”, Arqueología Mexicana, 2005.Garza, S. y A. Molina, Xochicalco. Guía, México, INAH/Salvat, 1994.Garza, S. y B. Palavicini, “Proyecto de Investigación Xochicalco”, Revista de la Universidad de México, nueva época, núm. 629, noviembre de 2003.Garza, Silvia, Claudia Alvarado y Beatriz Palavicini, “Storage at Xochicalco, Morelos, México”, en prensa.Garza, Silvia, Claudia Alvarado y Beatriz Palavicini, “Xochicalco en la secuencia mesoamericana”, Coordinación Nacional de Arqueología/DEA/Museo del Templo Mayor, en prensa.Garza T., Silvia, “La cerámica de Xochicalco”, en L. Mirambell y A. García Cook (eds.), La producción alfarera en el México antiguo, México, INAH, 2006, pp.125-160.Garza T., Silvia, “Un marcador en Xochicalco”, en Homenaje a Jaime Litvak, Antonio Benavides, Linda Manzanilla y Lorena Mirambell (coords.), México, IIA-UNAM/INAH (Científica, 458), 2004, pp.195-203.Garza T., Silvia, Xochicalco, Morelos. Miniguía, México, INAH, 2001 [1998].Garza T., Silvia, “Xochicalco”, en The Oxford Encyclopedia of Mesoamerican Cultures, 2000.Garza T., Silvia, La Pirámide de las Serpientes Emplumadas. Xochicalco, Morelos. Miniguía, México, INAH, 1999.Garza T., Silvia, “La Pirámide de las Serpientes Emplumadas”, Arqueología Mexicana, vol. V, núm. 30, 1998a, pp. 22-25.Garza T., Silvia, “José Antonio Alzate y Ramírez (1737-1799)”, Arqueología Mexicana, vol. 30, núm. 24, 1998b.Garza T., Silvia, “Xochicalco. La Acrópolis de Xochicalco”, Instituto de Cultura, 1995, pp: 89-144.Garza T., Silvia, “Xochicalco”, Arqueología Mexicana, vol.II, núm. 10, 1994, pp. 70-74.Garza T., Silvia, Los eclipses en época prehispánica. Estado de Morelos, Cuernavaca, Gobierno del Estado de Morelos, 1991.Garza T., Silvia, “Comunicaciones y accesos externos de Xochicalco”, mecanoescrito, México, ENAH, 1965.Garza T., Silvia y Pablo Mayer, “Proyecto Mantenimiento Mayor, Xochicalco, 1991”, en Boletín del Consejo de Arqueología, 1992, pp. 109-113.Garza T., Silvia y Pablo Mayer, “Análisis de la cerámica de los pozos estratigráficos: Xochicalco 1984”, 1991a.Garza T., Silvia y Pablo Mayer, “Xochicalco 1991”, Cuernavaca, Archivo del Centro Regional del INAH en Morelos, 1991b.Garza T., Silvia y Pablo Mayer, “Xochicalco 1991”, Boletín del Consejo de Arqueología, 1991c.Garza T., Silvia, C. Pijoan y J. Mansilla, “Pórtico I4 de Xochicalco, Morelos, México. Localización arqueológica de materiales esqueléticos”, en María Pilar Aluja, Asunción Malgosa y Ramón Ma. Nogués (eds.), Memorias del XII Congreso de la Sociedad Española de Antropología Biológica, Madrid, Bellaterra, 2002, pp. 91-98.Garza T., Silvia, Hortensia de Vega y Pablo Mayer, “Proyecto Xochicalco 1984”, Cuernavaca, Archivo del Centro Regional de INAH en Morelos, 1985.Garza T., Silvia, “Proyecto Xochicalco 1986”, Cuernavaca, Archivo del Centro Regional del INAH en Morelos, 1986.Garza Tarazona, S., H. de Vega Nova, P. Mayer Guala y G. Canto Aguilar, “Archaeological investigations at Xochicalco, Morelos: 1984 and 1986”, Ancient Mesoamerica, núm. 6, 1995, pp. 223-236.González Crespo, Norberto, “Proyecto Xochicalco, Morelos”, en Anales de Arqueología, México, INAH, 2005.González Crespo, Norberto, “Proyectos especiales de arqueología. Memoria, Xochicalco, Morelos”, México, INAH, 1995.González Crespo, Norberto, “Xochicalco, Morelos”, en La arqueología mexicana en el umbral del siglo XXI, proyectos especiales de arqueología, México, Museo Nacional de Antropología-INAH-Conaculta, 1994, pp. 42-44.González Crespo, Norberto, “Xochicalco, Morelos: memoria e identidad”, Arqueología, 1993a, pp.136-157.González Crespo, Norberto, “Xochicalco. Guía”, en Proyectos especiales de arqueología, México, INAH-conaculta (Fondo Nacional Arqueológico), 1993b, pp. 54-57.González Crespo, Norberto, “Pensamientos de Morelos”, en Tamoachan. Una crónica de historia regional Centro Regional Morelos, Cuernavaca, INAH/SEP/Diario El Regional del Sur, 18 de septiembre de 1988.González Crespo, Norberto, “Informe anual de las labores desempeñadas en el Centro Regional Morelos”, México, Archivo de la Dirección General del INAH, 1982-1991.González Crespo, Norberto, “Informe anual de las labores desempeñadas en el Centro Regional del Sureste”, México, Archivo de la Dirección de Centros Regionales, 1973-1981.González Crespo, Norberto, Patrón de asentamientos prehispánicos en la parte central del Bajo Balsas: un ensayo metodológico, México, INAH (Científica, Arqueología, 73), 1979.González Crespo, Norberto, “Informe de las excavaciones de la primera temporada en el Vaso de la Presa de La Angostura, Chiapas”, México, Archivo del Departamento de Prehistoria, 1971.González Crespo, Norberto, “Informe de la localización de sitios arqueológicos en el Vaso de la Presa de La Angostura, Chiapas”, México, Archivo del Departamento de Prehistoria, 1970.González Crespo, Norberto, ”Informe de los trabajos de exploración arqueológicos durante la tercera temporada de Tlapacoya, México”, México, Archivo del Departamento de Prehistoria, 1969a.González Crespo, Norberto, “Informe de salvamento arqueológico durante la construcción del Metro de la Ciudad de México”, México, Archivo del Departamento de Prehistoria, 1969b.González Crespo, Norberto, “Informe de las excavaciones de la tercera temporada en la cueva del Texcal, Puebla”, México, Archivo del Departamento de Prehistoria, 1965a.González Crespo, Norberto, ”Informe de las excavaciones de la cuarta temporada en la cueva del Texcal, Puebla”, México, Archivo del Departamento de Prehistoria, 1965b.González Crespo, Norberto, “Informe del salvamento arqueológico durante la construcción del Metro de la Ciudad de México”, México, Archivo del Departamento de Prehistoria, 1965c.González Crespo, Norberto, ”Informe del reconocimiento de superficie en La Manzanilla, Pue”, México, Archivo del Departamento de Prehistoria, 1962a.González Crespo, Norberto, “Informe de la localización de sitios arqueológicos en el Vaso de la Presa de Infiernillo, Michoacán, Guerrero”, México, Archivo del Departamento de Prehistoria, 1962b.González Crespo, Norberto, ”Informe de las excavaciones de sitios arqueológicos en el Vaso de la Presa de Infiernillo, Michoacán-Guerrero”, México, Archivo del Departamento de Prehistoria, 1962c.González Crespo, Norberto, “Informe de excavaciones en Tepeapulco, Estado de México”, México, Archivo del Departamento de Prehispánicos, 1961.González Crespo, Norberto y Alfredo Sotomayor, “Recuperación de fósiles en Valsequillo, Puebla”, México, Archivo del Departamento de Prehistoria, 1966.González Crespo, Norberto y Alfredo Sotomayor, “Estudios geológicos en el Valle de Teotihuacán”, México, Archivo del Departamento de Prehistoria, 1965.González, Norberto, S. Garza, B. Palavicini y C. Alvarado, “La cronología de Xochicalco”, Arqueología, núm. 37, 2008, pp. 122-139.González, Norberto, S. Garza, B. Palavicini y C. Alvarado, “Investigación, restauración y mantenimiento de la zona arqueológica de Xochicalco, Morelos”, en V Semana de Arquitectura de la ENCRYM, México, INAH-Conaculta, 2004, pp. 99-105.Márquez Morfín, Lourdes, Las momias de la iglesia de Santa Elena, Yucatán, México, INAH (Científica, 142), 1984.Medina, Miguel, “Localización de sitios arqueológicos en el Vaso de la Presa La Villita, Michoacán-Guerrero”, Boletín INAH, núm. 26, 1966, pp. 9-12.Vega, Hortensia de, “Un tipo de observación astronómica en Xochicalco”, en Tamoanchán. Una crónica de historia regional, Centro Regional Morelos-INAH/SEP/Diario El Regional del Sur, 19 de junio de 1988
DEM-WCSPH Modeling of Hydroelastic Slamming
No full textIn this work, we present a numerical approach to tackle elastic fluid-structure interaction (FSI) cases, built within the Smoothed Particle Hydrodynamics (SPH) framework of DualSPHysics augmented with the multiphysics Project Chrono library. Within a homogeneous Lagrangian environment, the SPH particles constitute both the solid and fluid domains. The fluid dynamics behaves according to a WCSPH (Weakly Compressible SPH) method, whereas the structure particles move according to a properly developed rotational dynamic model. Flexible elements complying with the Euler-Bernoulli theory and discretized according to a lumped-elasticity formulation are used to reproduce the elastic behavior of a cantilevered beam and two double-clamped beams. The first validation for the presented approach is performed using the theoretical solution for the
undamped free vibrations of a cantilevered beam. In addition, for validating its motion, a new theoretical solution is proposed to define the evolution of stress function in the cross sections of the beam, and the model provides exceptional compliance with the reference solution. Finally, the DEM-WCSPH scheme is validated through an FSI benchmark case of a deformable structure impacting still water, comparing solid displacement and fluid pressure time evolution with semi-analytical and a numerical solutions. The results obtained prove that DEM WCSPH coupling is an advantageous tool to approach complex multiphysics phenomena, with an interesting outlook regarding simulations of elastoplastic elements and fluid-driven structure collapses
DATASET Lipid turnover through lipophagy in the newly identified extremophilic green microalga Chlamydomonas urium
No full textFile List: Fig. S1 Exposure of Chlamydomonas urium and Chlamydomonas reinhardtii cells to low pH, toxic concentrations of heavy metals or organic carbon.
Fig. S2 Growth rate of Chlamydomonas urium and Chlamydomonas reinhardtii cells grown in HSM liquid medium at pH 7 under normal light or high light.
Fig. S3 Total chlorophyll levels of Chlamydomonas urium and Chlamydomonas reinhardtii.
Fig. S4 Photosynthetic parameters of Chlamydomonas urium and Chlamydomonas reinhardtii cells.
Fig. S5 ATG8 proteins from Chlamydomonas urium and Chlamydomonas reinhardtii.
Fig. S6 Electron microscopy images of Chlamydomonas urium cells subjected to nitrogen starvation in the presence of ConcA.
Fig. S7 Comparative metabolic analysis of Chlamydomonas urium and Chlamydomonas reinhardtii cells grown in HSM medium under normal conditions.
Fig. S8 Oxygen production and relative electron transport rate in Chlamydomonas urium and Chlamydomonas reinhardtii in the absence or presence of ConcA.
Table S1 List of species used in the study.
Table S2 Genes involved in lipid degradation in Chlamydomonas reinhardtii and Chlamydomonas urium.
Table S3 Statistical analysis from main figures.Autophagy is a central degradative pathway highly conserved among eukaryotes, includingmicroalgae, which remains unexplored in extremophilic organisms. In this study, we describedand characterized autophagy in the newly identified extremophilic green microalga Chlamy-domonas urium, which was isolated from an acidic environment. The nuclear genome of C. urium was sequenced, assembled and annotated in order toidentify autophagy-related genes. Transmission electron microscopy, immunoblotting, meta-bolomic and photosynthetic analyses were performed to investigate autophagy in this extre-mophilic microalga. The analysis of the C. urium genome revealed the conservation of core autophagy-relatedgenes. We investigated the role of autophagy in C. urium by blocking autophagic flux withthe vacuolar ATPase inhibitor concanamycin A. Our results indicated that inhibition of autop-hagic flux in this microalga resulted in a pronounced accumulation of triacylglycerols and lipiddroplets (LDs). Metabolomic and photosynthetic analyses indicated that C. urium cells withimpaired vacuolar function maintained an active metabolism. Such effects were not observedin the neutrophilic microalga Chlamydomonas reinhardtii. Inhibition of autophagic flux in C. urium uncovered an active recycling of LDs through lipo-phagy, a selective autophagy pathway for lipid turnover. This study provided the metabolicbasis by which extremophilic algae are able to catabolize lipids in the vacuoleThis work was supported in part by the Ministerio de Ciencia, Innovación y Universidades (grants PID2021-123500NB-I00 to JLC, PID2019-110080GB-I00 to MEPP and TED2021-130912B-I00 to JLC and MEPP), CSIC (grant 2023AEP102 to MEPP) and Junta de Andalucía (grant P20_00057 to JLC), a Juan de la Cierva postdoctoral contract (FJC2021-048000-I) to MJMP, and a predoctoral contract (PRE2022-102797) to YOG.Peer reviewe
Efficiency and survivability analysis of a point-absorber wave energy converter using DualSPHysics
No full textSmoothed Particle Hydrodynamics (SPH) method is used here to simulate a heaving point-absorber with a Power Take-Off system (PTO). The SPH-based code DualSPHysics is first validated with experimental data of regular waves interacting with the point-absorber. Comparison between the numerical and experimental heave displacement and velocity of the device show a good agreement for a given regular wave condition and different configurations of the PTO system. The validated numerical tool is then employed to investigate the efficiency of the proposed system. The efficiency, which is defined here as the ratio between the power absorbed by the point-absorber and its theoretical maximum, is obtained for different wave conditions and several arrangements of the PTO. Finally, the effects of highly energetic sea states on the buoy are examined through alternative configurations of the initial system. A survivability study is performed by computing the horizontal and vertical forces exerted by focused waves on the wave energy converter (WEC). The yield criterion is used to determine that submerging the heaving buoy at a certain depth is the most effective strategy to reduce the loads acting on the WEC and its structure, while keeping the WEC floating at still water level is the worst-case scenario.This work was partially financed by the Ministry of Economy and Competitiveness of the Government of Spain under project “WELCOME ENE2016-75074-C2-1-R″ and financed by Xunta de Galicia (Spain) under project ED431C 2017/64 ″Programa de Consolidación e Estructuración de Unidades de Investigación Competitivas (Grupos de Referencia Competitiva)" cofunded by European Regional Development Fund (ERDF). Dr. C. Altomare acknowledges funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No.: 792370. Dr J. M. Domínguez acknowledges funding from Spanish government under the program “Juan de la Cierva-incorporación 2017” (IJCI-2017-32592).Peer ReviewedPostprint (author's final draft
Lipid turnover through lipophagy in the newly identified extremophilic green microalga Chlamydomonas urium
No full textChemicals and CAS Registry Numbers
concanamycin A 66771-59-3, 80890-47-7
concanamycin A
Macrolides
TriglyceridesAutophagy is a central degradative pathway highly conserved among eukaryotes, includingmicroalgae, which remains unexplored in extremophilic organisms. In this study, we describedand characterized autophagy in the newly identified extremophilic green microalga Chlamy-domonas urium, which was isolated from an acidic environment. The nuclear genome of C. urium was sequenced, assembled and annotated in order toidentify autophagy-related genes. Transmission electron microscopy, immunoblotting, meta-bolomic and photosynthetic analyses were performed to investigate autophagy in this extre-mophilic microalga. The analysis of the C. urium genome revealed the conservation of core autophagy-relatedgenes. We investigated the role of autophagy in C. urium by blocking autophagic flux withthe vacuolar ATPase inhibitor concanamycin A. Our results indicated that inhibition of autop-hagic flux in this microalga resulted in a pronounced accumulation of triacylglycerols and lipiddroplets (LDs). Metabolomic and photosynthetic analyses indicated that C. urium cells withimpaired vacuolar function maintained an active metabolism. Such effects were not observedin the neutrophilic microalga Chlamydomonas reinhardtii. Inhibition of autophagic flux in C. urium uncovered an active recycling of LDs through lipo-phagy, a selective autophagy pathway for lipid turnover. This study provided the metabolicbasis by which extremophilic algae are able to catabolize lipids in the vacuoleThis work was supported in part by the Ministerio de Ciencia, Innovación y Universidades (grants PID2021-123500NB-I00 to JLC, PID2019-110080GB-I00 to MEPP and TED2021-130912B-I00 to JLC and MEPP), CSIC (grant 2023AEP102 to MEPP) and Junta de Andalucía (grant P20_00057 to JLC), a Juan de la Cierva postdoctoral contract (FJC2021-048000-I) to MJMP, and a predoctoral contract (PRE2022-102797) to YOG.Peer reviewe
Copper metabolism and gut morphology in rainbow trout (Oncorhynchus mykiss) during chronic sublethal dietary copper exposure
No full textJuvenile rainbow trout (Oncorhynchus mykiss) were exposed to 11 (control), 300 (medium), and 1000 mug Cu.g(1) (high) (as CuSO(4)5H(2)O) in the diet for 28 days at a daily ration of 4% wet body weight, with a background waterborne Cu concentration of 3 mug.L-1. There was no effect of dietary Cu on growth, condition factor, or food conversion efficiency. Whole-body Cu content increased continuously over the exposure period in all groups and was twofold and fourfold higher than controls at day 28 for the medium- and high-Cu diets, respectively. Copper accumulated mainly in liver and gut tissue, with the latter stabilizing by day 14. Accumulation also occurred in gill, kidney, and carcass. Plasma Cu concentration was not different from the controls whereas Cu in bile was greatly elevated, an indication of increased hepatobiliary excretion. Dietary Cu pre-exposure decreased the uptake of waterborne Cu across the gills, providing the first evidence of homeostatic interaction between the two routes of uptake. Electron microscopic observations of the midintestine revealed numerous mitochondria, lysosomes, lamellated bodies, and extensive lamellar processes in the enterocytes. Apoptosis, mitosis, and eosinophilic granule cells were more apparent in Cu-exposed fish.PT: J; CR: BERNTSSEN MHG, 1999, AQUAT TOXICOL, V46, P87 CAMPBELL HA, 1999, AQUAT TOXICOL, V46, P177 COLMAN JR, 1979, SCANNING ELECT MICRO, V11, P801 CRESPO S, 1986, J FISH BIOL, V28, P68 DALLINGER R, 1985, OECOLOGIA, V67, P82 DALLINGER R, 1987, OECOLOGIA, V73, P91 EZEASOR DN, 1980, J FISH BIOL, V17, P529 FARAG AM, 1994, ENVIRON TOXICOL CHEM, V13, P2021 GATLIN DM, 1986, AQUACULTURE, V54, P277 GROSELL M, 2000, IN PRESS AM J PHYSL GROSELL MH, 1997, AQUAT TOXICOL, V38, P257 GROSELL MH, 1998, AQUAT TOXICOL, V40, P275 GUASTADISEGNI C, 1999, J TOXICOL ENV HEAL A, V57, P415 HANDY RD, 1992, ARCH ENVIRON CON TOX, V22, P74 HANDY RD, 1993, AQUAT TOXICOL, V27, P1 HANDY RD, 1996, TOXICOLOGY AQUATIC P, P29 HANDY RD, 1999, AQUAT TOXICOL, V47, P23 HUGHES GM, 1984, FISH PHYSIOL, V10, P1 JULSHAMN K, 1988, AQUACULTURE, V73, P143 LANNO RP, 1985, AQUACULTURE, V49, P257 LANNO RP, 1987, AQUAT TOXICOL, V10, P251 LULLMANNRAUCH R, 1979, LYSOSOMES APPLIED BI, V6, P49 MACRAE RK, 1999, ENVIRON TOXICOL CHEM, V18, P1180 MARR JCA, 1996, AQUAT TOXICOL, V36, P17 MCDONALD DG, 1993, FISH ECOPHYSIOLOGY, P270 MILLER PA, 1993, CAN J FISH AQUAT SCI, V50, P1683 MOUNT DR, 1994, ENVIRON TOXICOL CHEM, V13, P2031 MURAI T, 1981, AQUACULTURE, V22, P352 NONNOTTE L, 1986, CELL TISSUE RES, V243, P619 OGINO C, 1980, NIPPON SUISAN GAKK, V46, P455 TAYLOR LN, 2000, ENVIRON TOXICOL CHEM, V19, P2298 WEIS P, 1986, ENVIRON HEALTH PERSP, V65, P167 WOLF K, 1963, PROGRE FISH CULT, V25, P135 WOOD CM, 1992, AQUAT TOXICOL, V22, P239 WOODWARD DF, 1994, T AM FISH SOC, V123, P51 WOODWARD DF, 1995, CAN J FISH AQUAT SCI, V52, P1994; NR: 36; TC: 24; J9: CAN J FISHERIES AQUAT SCI; PG: 13; GA: 399WRSource type: Electronic(1
ULTRAFAST DYNAMICS IN NITRO- AND (ORGANOPHOSPHINE)GOLD(I)-POLYCYCLIC AROMATIC HYDROCARBONS
No full textAuthor Institution: Department of Chemistry and Center for Chemical Dynamics, Case Western Reserve University, Cleveland, Ohio 44106, USAFemtosecond UV/Vis broadband transient absorption was used to investigate the excited-state dynamics in nitronaphthalenes and (organophosphine)gold(I) naphthalenes. Both groups of compounds display similar dynamics. Following excitation with UV light the compounds undergo fast and efficient intersystem crossing to the triplet manifold with a lifetime between 0.1 and 0.3ps. Once in the triplet manifold, internal conversion occurs from the receiver triplet state to the lowest-energy triplet state (T). Vibrational cooling in the T state then proceeds with a lifetime between 3 and 11ps, which depends on the substituent on the naphthalene moiety. Quantum chemical calculations including solvent effects are used to substantiate the interpretation of the experimental results. Comparisons between the naphthalene derivatives and the previously studied pyrene-containing derivatives\textsuperscript{[1,2]} will be discussed. \\ \hline\\ \vspace{4mm} (1) Crespo-Hernandez, C., E.; Burdzinski, G.; Arce, R. \textit{J. Phys. Chem. A} \textbf{2008}, nderline{112}: 6313.\\ (2) Vogt, R. A.; Peay, M. A.; Gray, T. G.; Crespo-Hernandez, C. E. \textit{J. Phys. Chem. Lett.} \textbf{2010}, nderline{1}: 1205
Thermal arrest analysis of the reverse martensitic transformation in a Ni55Fe19Ga26 Heusler alloy obtained by melt-spinning
No full textNi55Fe19Ga26 ribbons obtained by melt-spinning technique exhibit a martensitic transformation from L21 cubic austenite phase to 14 M martensite phase above room temperature. We have taken advantage of the existence of thermal hysteresis of the martensitic phase transition (~ 11 K) to analyze the effect of isothermal treatments on the reverse martensitic transformation, which has been analyzed by means of interrupted heating using differential scanning calorimetry. The experimental findings clearly indicate a time-depending effect in the martensitic transformation at temperatures between the austenite start and finish temperatures. Moreover, it has been observed that two successive martensitic transformations take place after the isothermal arrest was performed.This work was supported by AEI/FEDER-UE (Projects US-1260179 and P18-RT-746) and the PAI of the Regional Government of Andalucía. A. Vidal-Crespo acknowledges a VPPI-US fellowship. P. Svec acknowledges support of the projects APVV-19-0369 and VEGA 2/0144/21.Peer reviewe
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