531 resultados para Escriptura extensiva


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Volem constatar com, en la nostra realitat quotidiana, sovint tenim poc en compte les necessitats de comprensió dels alumnes quan elaborem textos didàctics. Si no pensem en adequar el vocabulari ni la complexitat gramatical al que realment poden abastar en diferents edats, la significativitat dels aprenentatges se'n ressentirà. Si els estudiants no han estat capaços d'entendre el contingut, no podran respondre a activitats que els ho exigeixin, com les de PISA, que pretenen avaluar la comprensió a partir d'un concepte de lectura molt ampli i allunyat de la mera comprensió literal ii. Ans al contrari, només seran capaços de respondre a activitats d'un nivell d'exigència comprensiva molt baix, com les que els proposen bona part dels llibres de text d'ús corrent al nostre país, com ara vull constatar

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Systems whose spectra are fractals or multifractals have received a lot of attention in recent years. The complete understanding of the behavior of many physical properties of these systems is still far from being complete because of the complexity of such systems. Thus, new applications and new methods of study of their spectra have been proposed and consequently a light has been thrown on their properties, enabling a better understanding of these systems. We present in this work initially the basic and necessary theoretical framework regarding the calculation of energy spectrum of elementary excitations in some systems, especially in quasiperiodic ones. Later we show, by using the Schr¨odinger equation in tight-binding approximation, the results for the specific heat of electrons within the statistical mechanics of Boltzmann-Gibbs for one-dimensional quasiperiodic systems, growth by following the Fibonacci and Double Period rules. Structures of this type have already been exploited enough, however the use of non-extensive statistical mechanics proposed by Constantino Tsallis is well suited to systems that have a fractal profile, and therefore our main objective was to apply it to the calculation of thermodynamical quantities, by extending a little more the understanding of the properties of these systems. Accordingly, we calculate, analytical and numerically, the generalized specific heat of electrons in one-dimensional quasiperiodic systems (quasicrystals) generated by the Fibonacci and Double Period sequences. The electronic spectra were obtained by solving the Schr¨odinger equation in the tight-binding approach. Numerical results are presented for the two types of systems with different values of the parameter of nonextensivity q