990 resultados para Continuous functions


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Resumen tomado de la publicaci??n

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Resumen basado en el de la publicaci??n

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We present algorithms for computing approximate distance functions and shortest paths from a generalized source (point, segment, polygonal chain or polygonal region) on a weighted non-convex polyhedral surface in which obstacles (represented by polygonal chains or polygons) are allowed. We also describe an algorithm for discretizing, by using graphics hardware capabilities, distance functions. Finally, we present algorithms for computing discrete k-order Voronoi diagrams

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Bimodal dispersal probability distributions with characteristic distances differing by several orders of magnitude have been derived and favorably compared to observations by Nathan [Nature (London) 418, 409 (2002)]. For such bimodal kernels, we show that two-dimensional molecular dynamics computer simulations are unable to yield accurate front speeds. Analytically, the usual continuous-space random walks (CSRWs) are applied to two dimensions. We also introduce discrete-space random walks and use them to check the CSRW results (because of the inefficiency of the numerical simulations). The physical results reported are shown to predict front speeds high enough to possibly explain Reid's paradox of rapid tree migration. We also show that, for a time-ordered evolution equation, fronts are always slower in two dimensions than in one dimension and that this difference is important both for unimodal and for bimodal kernels

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The occurrence of negative values for Fukui functions was studied through the electronegativity equalization method. Using algebraic relations between Fukui functions and different other conceptual DFT quantities on the one hand and the hardness matrix on the other hand, expressions were obtained for Fukui functions for several archetypical small molecules. Based on EEM calculations for large molecular sets, no negative Fukui functions were found

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Different procedures to obtain atom condensed Fukui functions are described. It is shown how the resulting values may differ depending on the exact approach to atom condensed Fukui functions. The condensed Fukui function can be computed using either the fragment of molecular response approach or the response of molecular fragment approach. The two approaches are nonequivalent; only the latter approach corresponds in general with a population difference expression. The Mulliken approach does not depend on the approach taken but has some computational drawbacks. The different resulting expressions are tested for a wide set of molecules. In practice one must make seemingly arbitrary choices about how to compute condensed Fukui functions, which suggests questioning the role of these indicators in conceptual density-functional theory

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Linear response functions are implemented for a vibrational configuration interaction state allowing accurate analytical calculations of pure vibrational contributions to dynamical polarizabilities. Sample calculations are presented for the pure vibrational contributions to the polarizabilities of water and formaldehyde. We discuss the convergence of the results with respect to various details of the vibrational wave function description as well as the potential and property surfaces. We also analyze the frequency dependence of the linear response function and the effect of accounting phenomenologically for the finite lifetime of the excited vibrational states. Finally, we compare the analytical response approach to a sum-over-states approach

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The evaluation appears as a natural process in which a professional education to build a notion of content assimilated by the students as well as whether the teaching methods adopted by him are having an effect on learning of these. Long meant, to apply only to evaluate evidence, a grade and classify students in approved and disapproved. Even today there are teachers who believe that assessment is only in this process. However, this vision has been gradually modified. The evaluation is not at the time of carrying out tests and checks, but is an ongoing process, aimed at reflection for error correction and forwarding the student to acquire the expected objectives. This study was designed to analyze the data from the result of the survey, we can see that the form evaluative functions as an element of integration and motivation for the teaching-learning process. The speech of most education professionals interviewed here reflects the current notion that the evaluation process is currently understood not only as the result of the tests, but the results of the work and / or research that students perform. There are numerous evaluative techniques that allow the teacher to evaluate student performance and escape the traditional written exam, allowing teachers and students to dialogue sought to find and correct possible errors by redirecting the student for learning, motivating for the correction, and suggesting to him new ways of study for better understanding of the issues addressed within the class. The key is to understand that the evaluation process is not just about taking exams and assign grade. Evaluation is a continuous learning process that occurs every day in order to correct mistakes and build new knowledge.

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At the School of Museology, a project with ten years of tradition, we carry out module-based programmes to educate and qualify different target audiences working in the filed of cultural heritage. Our development and realization of educational programmes and training courses directed at practical applicability, including life-long learning of adults, topic complementarity with related professional and scientific fields, connection with universities offering undergraduate and postgraduate studies of heritages, promotion of theoretical museological discourses raising awareness of the meaning of cultural heritage, firm placement in an international network of related institutions and promotion of international relations with special emphasis on neighbouring countries. We encourage project partnership and cooperate with different domestic and foreign associates in forming and carrying out programmes.

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This study investigates possible vestibular dysfunctions in the deaf using a typical clinical assessment battery and discerns whether there is a trend between these disorders in meningitic children as compared to children with unknown origins of deafness.

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This paper discusses the diagnostic battery of the CELF in terms of construct validity and in administration of subtests.