1,685 research outputs found
Fractional Wave-diffusion Equation With Periodic Conditions
No full textWe study a time-space fractional wave-diffusion equation with periodic conditions using Laplace transforms and Fourier series and presenting its solution in terms of three-parameter Mittag-Leffler functions. As a particular case we recover a recent result. We also present some graphics associated with particular values of the parameters. © 2012 American Institute of Physics.5312Caputo, M., Carcione, J.M., Hysteresis cycles and fatigue criteria using anelastic models based on fractional derivatives (2011) Rheol. Acta, 50 (2), pp. 107-115. , 10.1007/s00397-010-0524-zMainardi, F., Spada, G., Creep, relaxation and viscosity properties for basic fractional models in rheology (2011) Eur. Phys. J. Spec. Top., 193, pp. 133-160. , 10.1140/epjst/e2011-01387-1, e-print arXiv:cond-mat.mtrl.sci1110.3400v1Mainardi, F., Mura, A., Pagnini, G., The M-Wright function in time-fractional diffusion processes: A tutorial survey (2010) Int. J. Differ. Equations, 2010, p. 104505. , 10.1155/2010/104505, e-print arXiv:org/abs/1004.2950(2011) Fractional Dynamics, Recent Advances, , J. Klafter, S. C. Lim, R. Metzler, edited by and (World Scientific, Singapore, )Costa, F.S., Fractional thermal systems (2011) International Conference on Multimedia Technology (ICMT), , E. Capelas de Oliveira, Hangzhou, China, 26-28 JulyOliveira, E., Costa, F.S., Vaz, J., The fractional Schrödinger equation for delta potentials (2010) J. Math. Phys., 51, p. 123517. , 10.1063/1.3525976Oliveira, E., Vaz, J., Tunneling in fractional quantum mechanics (2011) J. Phys. A: Math. Theor., 44, p. 185303. , 10.1088/1751-8113/44/18/185303Machado, J.T., Kiryakova, V., Mainardi, F., Recent history of fractional calculus (2011) Nonlinear Sci. Number. Simul., 16, pp. 1140-1153. , 10.1016/j.cnsns.2010.05.027Podlubny, I., (1999) Fractional Differential Equations, , (Academic, San Diego, )Kilbas, A.A., Srivastava, H.M., Trujillo, J.J., (2006) Theory and Applications of Fractional Differential Equations, 204. , J. Van Mill, and Mathematics Studies, edited by (Elsevier, Amsterdam, )Zhang, H., Liu, F., The fundamental solutions of the space, space-time Riesz fractional partial differential equations with periodic conditions (2007) Numer. Math. J. Chin. Univ., 16, pp. 181-192Prabhakar, T.R., A singular integral equation with generalized Mittag-Leffler function in the kernel (1971) Yokohama Math. J., 19, pp. 7-25Samko, S.G., Kilbas, A.A., Marichev, O.I., (1993) Fractional Integrals and Derivatives: Theory and Applications, , (Gordon and Breach, New York, )Mainardi, F., Luchko, Y., Pagnini, G., The fundamental solution of the space-time fractional diffusion equation (2001) Fract. Calc. & Appl. Anal., 4 (2), pp. 153-192. , e-print arXiv:cond-mat.stat.mech/0702419v1Camargo, R., Charnet, R., de Oliveira, E., On the fractional Green function (2009) J. Math. Phys., 50, p. 043514. , 10.1063/1.311948
Line stock control and vendor managed inventory at Infineon Technologies
No full textEstágio realizado na Infineon Technologies -F.S., Portugal, S. ARelatório do Estágio Curricular da LGEI 2004/200
Supplementrary informtion: Trait-based insights into sustainable fisheries: A four-decade perspective in Azores archipelago
No full text<p>Supplementary information for the article entitled "Trait-based insights into sustainable fisheries: A four-decade perspective in Azores archipelago " by the authors Eudriano F.S. Costa, Gui Menezes and Ana Colaço.</p>
Supplementary information: Trait-based insights into sustainable fisheries: A four-decade perspective in Azores archipelago
No full text<p>Supplementary information for the article entitled "Trait-based insights into sustainable fisheries: A four-decade perspective in Azores archipelago " by the authors Eudriano F.S. Costa, Gui Menezes and Ana Colaço.</p>
Formación educativa desde el área de la Educación Especial, contextualizado y oportuno, a las necesidades de fortalecimiento de las habilidades para la vida reconocidas en conjunto con una Familia Solidaria del Programa de Servicios de Convivencia Familiar del CONAPDIS como una oportunidad de emancipación individual y colectiva
No full textEl propósito del presente estudio fue que la mediadora/investigadora en conjunto con las personas integrantes de una Familia Solidaria (F.S.) del Programa de Servicios de Convivencia Familiar del CONAPDIS construyeran un proceso de formación educativa desde el área de la Educación Especial para la emancipación individual y colectiva por medio del fortalecimiento de sus habilidades para la vida. La base metodológica responde a un paradigma socio crítico cualitativo, desde el método de Investigación Acción Participativa (IAP). La ruta metodológica compuesta por cinco etapas en las cuales la observación, los diálogos abiertos y discusiones entre/con los participantes, así como la disposición de involucramiento cotidiano por parte de la investigadora fundaron el proceso y a su vez, la experiencia educativa en la vivencia de encuentros. La misma tuvo lugar en la casa de la F.S, con el protagonismo de una persona encargada y dos usuarios del programa que se mantuvieron a lo largo del proceso, así como las interacciones y la complejidad que encierran las realidades. Entre los resultados, el reconocimiento de la realidad exponía con prioridad la convivencia como elemento esencial de acompañamiento, reflexión y abordaje, siendo el enfoque de Habilidades para la Vida (HpV) una posibilidad para construir una intención de investigación. El vínculo, la escucha y la resignificación de las palabras, abrió las oportunidades de fortalecimiento, en la consideración de una sociedad excluyente, privatizadora de oportunidades y desde la vivencia de una condición de discapacidad, que no necesariamente se desea asumir. En un descubrir, la persona encargada de la F.S., es un pilar de sostenibilidad y prioridad, así como la premura de asegurar posibilidades de formación a la población con mayor vulnerabilidad. La experiencia educativa, vislumbró una oportunidad de ser protagonistas de un espacio de formación abierto e inclusivo.Universidad Nacional, Costa RicaDivisión de Educación Básic
Is isotropy restored at small scales in freely decaying strongly stratified turbulence?
No full textWe analyse the scale-dependent anisotropy of homogeneous stratified turbulence. The Ozmidov scale l_N (Ozmidov 1965) helps to compare the relative effects of inertia and of the buoyancy force, and thus to quantify the rise of anisotropy in different scale ranges: at large scales l >> l_N the anisotropy due to strong stratification is dominant, whereas at small scales l << l_N, universal 3D isotropic characteristic of turbulence appear to be restored. We investigate the corresponding dynamics using Direct Numerical Simulations (DNS) in freely decaying turbulence at different stratification rates. We confirm the return to isotropy of the small scales by analyzing the orientation-dependent power spectrum and poloidal/toroidal/density energy modes. To some extent, many characteristics of isotropic universality are restored at small scales but, surprisingly, the density spectrum (also potential energy spectrum) plays a particular role
Status of the coral reefs in Foul and Folly Bays, Morant Wetlands, south-eastern Jamaica, with emphasis on corals and macroalgae
No full textFoul and Folly Bays are located within the Morant Wetlands near the eastern tip of Jamaica. They have never been investigated but were believed to be important for larval productivity because of the extent of benthic habitats, absence of major coastal developments and remote location. The study was aimed at providing baseline data on the spatial distribution and status of corals and associated benthos. We investigated coral reefs and associated areas with phototransects at eight stations analysed with the Coral Point Count software. Most areas were dominated by algae, evidence of a phase shift from coral to algal reefs. Coral cover varied significantly across the bays (ANOVA, p= 0.0342) with a maximum of 27.03% at the deepest station and a mean of 5.6% at all other stations combined. Mean cover of macroalgae was 39% and varied significantly across stations (α= 0.05, F= 7.472, p= 0.005). The deepest station also had the highest percentage of calcareous algae and live coral while dead coral with algae (DCA) was a significant variable across all other stations (ANOVA, p<0.001). Gorgonians (ANOVA, p<0.001), sponges and urchins were also assessed. Diadema antillarum was not observed at any station. Overall the status of the reefs was poor, probably due to overfishing, absence of urchins and the resultant algal proliferation. Rev. Biol. Trop. 62 (Suppl. 3): 39-47. Epub 2014 September 01.Las bahías Foul y Folly se encuentran dentro de los Humedales Morant cerca de la punta oriental de la isla de Jamaica. Estos dos bahías nunca han sido investigadas pero se cree que son áreas importantes para la productividad larvaria debido a la extensión de los hábitats bentónicos, ausencia de desarrollos importantes a lo largo de la costa y la ubicación remota de la zona. El estudio tuvo como objetivo proporcionar datos de referencia sobre la distribución espacial y el estado de los corales y del bentos asociado. Investigamos los arrecifes coralinos y áreas asociadas utilizando fototransectos en ocho estaciones analizadas con el programa Coral Point Count. La mayoría de las áreas tuvieron predominio algal, mostrando evidencia del desplazamiento de fase de coral a algas. La cobertura de coral varió significativamente a través de las bahías (ANOVA , p= 0.0342), con un máximo de 27.03% en la estación estación más profunda y una media de 5.6% en todas las demás estaciones combinadas. La media de porcentaje de cobertura de macroalgas fue de 39% y varió significativamente entre las estaciones (α= 0.05, F= 7.472, p= 0.005). La estación mas profunda presentaba el mayor porcentaje de algas calcáreas y coral vivo, mientras que el coral muerto con algas (DCA) fue una variable significativa en todas las demás estaciones (ANOVA , p<0.001). También se evaluaron las gorgonias (ANOVA , p<0.001), esponjas y erizos de mar. No se observó Diadema antillarum en todas las estaciones dentro de los transectos. En general, el estado de los arrecifes era pobre, probablemente debido a la pesca excesiva, la ausencia de erizos y la proliferación de algas resultante
Automation in sensing and raw material characterization - A conceptual framework
No full textThe use of sensor technologies for material characterization is rapidly growing and innovative advancement is observed. However, the use of sensor combinations for a raw material characterization in mining is very limited and automation of the material identification process using a combined sensor signal is not defined. Potential sensor technologies for raw material characterization were evaluated based on the applicability and technological maturity. To ensure a rapid implementation of the Real-time mining (RTM) project concept, mature technologies such as Red Green Blue (RGB) imaging, Visible Near Infrared (VNIR) hyperspectral imaging, Short Wave Infrared (SWIR) hyperspectral imaging, Fourier-Transform Infrared Spectroscopy (FTIR), Laser Induced Breakdown Spectroscopy (LIBS) and Raman were selected. Each selected technology was assessed for automation in sensing and applicability (for characterization of the test case materials). Based on the results the sensor data were further considered for data fusion. The proposed sensor combinations approach encompasses three levels of data fusion: low-level, mid-level and high-level. The data of the different sensors are fused together in order to acquire a wide range of mineral properties within each lithotype and an improved classification and predictive models. The preferred level of data fusion and preferred sensor data combinations will be used to develop a multi-variate statistical interpretation rule which relates combination of sensors signals with raw material properties. Thus a tool which integrates the combined sensor signal with materials properties will be developed and used to automate the material characterization process.Accepted Author ManuscriptResource Engineerin
Experimental and computational study of the influence of pre-damage patterns in unreinforced masonry crack propagation due to induced, repeated earthquakes
No full textInduced seismicity in the north of the Netherlands has recently exposed unprepared, unreinforced masonry structures to considerable earthquake risk. While the ultimate-limit state capacity of the structures is vital to assess the individual’s risk, their behavior during more frequent, lighter earthquakes, leading to ‘lighter damage’, has shown to be strongly linked to economic losses and societal unrest. When observing the light damage caused by minor earthquakes, the existing state of the structure appears to be highly relevant for the final damage intensity and configuration: earthquakes that may have otherwise caused no apparent damage, may intensify existing damage. In particular, incipient damage due to settlements is common in the baked-clay and calcium-silicate brick masonry structures of the region.This paper details the study of full-scale laboratory walls, pre-damaged following typical (crack) patterns caused by settlements and tested with quasi-static lateral loads. The aggravation of the damage during a relevant number of load cycles is monitored using full-field digital image correlation. The damage is quantified objectively using a purposely-developed damage parameter.The tests are used (together with previous studies) to further calibrate computational finite element models, which coupled with detailed soil-structure interaction boundary conditions, are then employed to assess a larger number of structural geometries and pre-damaged configurations exposed to (repeated) induced earthquake acceleration histories.Both experimental and computational approaches show that settlement pre-damage in masonry structures increases the likelihood and the amount of further damage. This is more easily observed when some initial, yet limited damage exists and the masonry wall is exposed to moderate earthquake vibrations in the order of 30 millimeters per second.Accepted Author ManuscriptApplied Mechanic
Re: An Institution Par Excellence: Prof. B. Ramamurthi 1922-2003. Surg Neurol 2004;61:511-14 [1]
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