Search results for "ESOL"
showing 10 items of 2444 documents
3D integral imaging display by smart pseudoscopic-to-orthoscopic conversion (SPOC).
2010
Previously, we reported a digital technique for formation of real, non-distorted, orthoscopic integral images by direct pickup. However the technique was constrained to the case of symmetric image capture and display systems. Here, we report a more general algorithm which allows the pseudoscopic to orthoscopic transformation with full control over the display parameters so that one can generate a set of synthetic elemental images that suits the characteristics of the Integral-Imaging monitor and permits control over the depth and size of the reconstructed 3D scene.
Three-dimensional imaging system with both improved lateral resolution and depth of field considering non-uniform system parameters
2018
In this paper, we propose a new 3D passive image sensing and visualization technique to improve lateral resolution and depth of field (DoF) of integral imaging simultaneously. There is a resolution trade-off between lateral resolution and DoF in integral imaging. To overcome this issue, a large aperture and a small aperture can be used to record the elemental images to reduce the diffraction effect and extend the DoF, respectively. Therefore, in this paper, we utilize these two pickup concepts with a non-uniform camera array. To show the feasibility of our proposed method, we implement an optical experiment. For comparison in details, we calculate the peak signal-to-noise ratio (PSNR) as th…
Hybrid magnetic materials formed by ferritin intercalated into a layered double hydroxide
2008
A hybrid magnetic material formed by ferritin intercalated into a layered double hydroxide (LDH) of Mg and Al (Mg/Al molar ratio 2) is prepared and characterized through powder X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier transform infrared (FT-IR) spectroscopy, electron probe microanalysis (EPMA) and high resolution transmission electron microscopy (HRTEM). One observes an enhancement in the thermal stability of the ferritin molecules when they are inserted in the layered material. Magnetic measurements of the hybrid material exhibit the typical superparamagnetic behaviour of the ferritin molecule. On the other hand, the intercalation of ferritin into the LDH guarante…
H-Point standard additions method for resolution of binary mixtures with simultaneous addition of both analytes
1995
Abstract The basis of the H-point standard additions method, HPSAM, with simultaneous addition of both analytes is proposed for the resolution of binary mixtures. It is a modification of the previously described H-point standard additions method that permits the resolution of both species from a unique calibration set by making the simultaneous addition of the two analytes. The method uses as analytical signals the absorbances at pairs of wavelengths where each species shows the same absorbance. The required data to apply the method are the absorbance values at the previously selected wavelengths for the sample alone and spiked with both species at known concentrations. Linear relations bet…
Learning to live together: a challenge for schools located in contexts of social vulnerability
2017
Currently, there are many educational centres that demonstrate the need to promote initiatives to improve coexistence at school at the international level, especially in those located in contexts of social vulnerability. A socio-educational programme has been developed, applied and evaluated at a Singular Education Action Centre (Centro de Acción Educativa Singular - C.A.E.S) in the city of Valencia (Spain). To ascertain the programme's impact and possible generalization to other contexts, a quasi-experimental pretest-posttest design with a control group was used. Information was collected from 297 students and 54 teachers based on questionnaires assessing coexistence at school. The results…
New Aspects of the Mesolithic-Neolithic Cemeteries and Settlement at Zvejnieki, Northern Latvia
2017
The paper reflects upon recent international research at Zvejnieki in northern Latvia, a renowned complex of a burial ground and two settlement sites used in the Mesolithic and Neolithic. Since its discovery and first excavations in the 1960s, Zvejnieki continues to produce evidence that provides new grounds for understanding mortuary practises and ancient lifeways. This information is relevant for other contemporary sites in Europe revealing new and hitherto unexpected elements of burial traditions. It is suggested that the Zvejnieki population was partly mobile, and the site was one of the places to bury the dead. The ancestral link was established through transportation and use of occupa…
Formal verification of a Cooperative Automatic Repeat reQuest MAC protocol
2012
Author's version of an article published in the journal: Computer Standards & Interfaces. Also available from the publisher at: http://dx.doi.org/10.1016/j.csi.2011.12.001 Cooperative communications, in which a relay node helps the source node to deliver its packets to the destination node, are able to obtain significant benefits in terms of transmission reliability, coverage extension and energy efficiency. A Cooperative Automatic Repeat reQuest (C-ARQ) MAC protocol has been recently proposed to exploit cooperative diversity at the MAC layer. in this paper, we validate the integrity and the validity of the C-ARQ protocol using formal methods. The protocol logic is modeled in SDL and implem…
Modos de enseñanza en los videotutoriales de matemáticas: equilibrio entre eficacia puntual y utilidad formativa
2020
Resumo Presentamos una propuesta de análisis de videotutoriales de internet basado en los estilos cognitivos Holístico-analítico y Verbal-imaginativo. Para ello, se distinguen entre dos modos de enseñanza: la eficacia puntual (resolver un problema aquí y ahora) y la utilidad formativa (resolver un problema ahora y para problemáticas afines). La utilidad docente de un videotutorial puede depender de un equilibrio adecuado entre estos modos de enseñanza. Se trata de lograr resolver un problema ahora, pero con sustentos generales y a más largo plazo. La caracterización de los videotutoriales, en este sentido, podría ayudar a los profesores en la elección de videos, ya que según sus necesidades…
Organocatalytic Enantioselective Synthesis of α-Hydroxyketones through a Friedel−Crafts Reaction of Naphthols and Activated Phenols with Aryl- and Al…
2016
[EN] An efficient organocatalytic asymmetric synthesis of alpha-hydroxyketones has been developed. Quinine-derived thiourea catalyzed the enantioselective Friedel Crafts alkylation of naphthols and activated phenols with aryl- and alkylglyoxal hydrates, providing the corresponding chiral alpha-hydroxyketones with high yields (up to 97%) and excellent enantioselectivities (up to 99% ee).
Resolución de conflictos e interacción social desde una comunidad social de investigación. Una propuesta formativa desde la unidad de investigación c…
2005
La investigación científica para la Resolución de Conflictos se ha enriquecido con los nuevos planteamientos epistemológicos que las ciencias sociales y el Enfoque Centrado en la Persona en particular han realizado a este respecto. Una innovación investigadora que incluye la interdisciplinariedad basada en la confianza y la integración paradigmática. Dar la prioridad a la necesidad de conciliar los conocimientos, de unificar sin destruir la diversidad (E. Vinyamata, 2004). El diálogo y el encuentro, el reconocimiento del otro, las comunidades investigadoras, etc. son el centro de relevantes propuestas para la validación de los conocimientos. La Unidad de Investigación Centrada en la Persona…