Search results for "Graphics"
showing 10 items of 1223 documents
Iterative constructions of central conic arcs using non-stationary IFS
2012
Several methods of subdivision exist to build parabola arcs or circle arcs in the usual Euclidean affine plane. Using a compass and a ruler, it is possible to construct, from three weighted points, circles arcs in the affine space without projective considerations. This construction is based on rational quadratic Bézier curve properties. However, when the conic is an ellipse or a hyperbola, the weight computation is relatively hard. As the equation of a conic is $\qaff(x,y)=1$, where $\qaff$ is a quadratic form, one can use the pseudo-metric associed to $\qaff$ in the affine plane and then, the conic geometry is also handled as an Euclidean circle. At each step of the iterative algorithm, t…
Universal method to determine acidic licit and illicit drugs and personal care products in water by liquid chromatography quadrupole time-of-flight
2016
Graphical abstract
Revista española de orientación y psicopedagogía
2014
RESUMENEste artículo pretende hacernos reflexionar sobre el futuro de la Orientación psicopedagógica en la actual encrucijada sociocultural apuntando algunas ideas sobre su probable evolución. Invita a situarse ante el problema analizando la importancia que el nuevo campo científico de la "Prospectiva" está adquiriendo para aportar soluciones científicas a los inquietantes retos del futuro. Además, ofrece una somera imagen del estado actual de la Orientación a fin de deliberar sobre sus posibles funciones en la sociedad venidera, en relación con: la demografía (envejecimiento e inmigración poblacional); la juventud; la multiculturalidad; la tecnología; la escuela (especialización, prevenció…
Nouveaux modèles géométriques pour la CAO et la synthèse d'images
2017
La géométrie du 21ème siècle est indissociable de l'ordinateur. La performance des logiciels de géométrie qu'ils soient gratuits ou sous licence d'exploitation s'accroit de jour en jour. La plupart repose sur la représentation de courbes à l'aide de points de contrôle communément appelés courbes Bézier ou courbes splines. L'ouvrage traite de ses courbes représentées par des points massiques c'est à dire des points pondérés ou des vecteurs. Plongées dans un espace non euclidien dit espace de Minkovski- Lorentz, elles servent à la représentation de surfaces canal, enveloppes de sphères orientées. En particulier, les coniques planes représentées par des points massiques de contrôle, placées da…
Statistical check of USLE-M and USLE-MM to predict bare plot soil loss in two Italian environments
2018
The USLE-M and the USLE-MM estimate event plot soil loss. In both models, the erosivity term is given by the runoff coefficient, QR, times the single-storm erosion index, EI30. In the USLE-MM, QREI30is raised to an exponent b1> 1 whereas b1= 1 is assumed in the USLE-M. Simple linear regression analysis can be applied to parameterize both models, but logarithmically transformed data have to be used for USLE-MM. Parameterizing the USLE-MM with nonlinear regression of untransformed data could be a more appropriate procedure. A statistical check of the two suggested models (USLE-M and USLE-MM), considering two alternative parameterization procedures for the USLE-MM, was carried out for the Mass…
Overview of ghost correction for HDR video stream generation
2015
International audience; Most digital cameras use low dynamic range image sensors, these LDR sensors can capture only a limited luminance dynamic range of the scene[1], to about two orders of magnitude (about 256 to 1024 levels). However, the dynamic range of real-world scenes varies over several orders of magnitude (10.000 levels). To overcome this limitation, several methods exist for creating high dynamic range (HDR) image (expensive method uses dedicated HDR image sensor and low-cost solutions using a conventional LDR image sensor). Large number of low-cost solutions applies a temporal exposure bracketing. The HDR image may be constructed with a HDR standard method (an additional step ca…
A CUDA-based implementation of an improved SPH method on GPU
2021
We present a CUDA-based parallel implementation on GPU architecture of a modified version of the Smoothed Particle Hydrodynamics (SPH) method. This modified formulation exploits a strategy based on the Taylor series expansion, which simultaneously improves the approximation of a function and its derivatives with respect to the standard formulation. The improvement in accuracy comes at the cost of an additional computational effort. The computational demand becomes increasingly crucial as problem size increases but can be addressed by employing fast summations in a parallel computational scheme. The experimental analysis showed that our parallel implementation significantly reduces the runti…
Canal foliations of S 3
2012
The goal of the article is to classify foliations of S3 by regular canal surfaces, that is envelopes of one-parameter families of spheres which are immersed surfaces. We will add some extra information when the leaves are “surfaces of revolution” in a conformal sense.
Tangents to fractal curves and surfaces
2010
International audience; The aim of our work is to specify and develop a geometric modeler, based on the formalism of iterated function systems with the following objectives: access to a new universe of original, various, aesthetic shapes, modeling of conventional shapes (smooth surfaces, solids) and unconventional shapes (rough surfaces, porous solids) by defining and controlling the relief (surface state) and lacunarity (size and distribution of holes). In this context we intend to develop differential calculus tools for fractal curves and surfaces defined by IFS. Using local fractional derivatives, we show that, even if most fractal curves are nowhere differentiable, they admit a left and…
Infografikas skolēnu funkcionālās rakstīšanas prasmju pilnveidei 5. klases angļu valodas stundās
2020
Angļu valoda ir nostiprinājusies kā pasaules starptautiskā valoda. Tomēr, lai gūtu panākumus visās ikdienas dzīves jomās, ir nepieciešams apgūt rakstisko komunikāciju, jeb funkcionālās rakstīšanas prasmes. Neskatoties uz to, ka skolēni skolas laikā tiek mācīti rakstīt, viņi bieži izprot funkcionālās rakstīšanas principus un likumus ar lielām grūtībām. Tāpēc diplomdarba mērķis bija izpētīt efektīvas mācīšanas pieejas, lai uzlabotu 5. klases skolēnu funkcionālās rakstīšanas prasmes ar pašu veidotu infografiku palīdzību. Izvēlētā pētījuma metode bija gadījuma izpēte, kura ietvēra vienu anketu skolēniem un skolēnu rakstiskos darbus kā datu vākšanas metodes. Tika noskaidrots, ka funkcionālās rak…