"Sci-Fi" Music Library

Tato bakalářská práce se zabývá počítačovým viděním jako možností pro interakci člověka s počítačem. Je zde popsána implementace hudební knihovny a přehrávače, který je ovládaný ukazováním CD krabiček hudebních alb a papírových ovládacích kartiček přehrávače na kameru, která je připojená k počítači. Práce popisuje algoritmy sloužící k segmentaci objektu ze scény na základě jeho obdélníkového tvaru a vyhodnocení shody s obrazovou databází (databazí alb) s použitím detektoru význačných bodů SURF. V závěru práce jsou shrnuty dosažené výsledky a nastíněny nápady a možnosti dalšího vývoje.This thesis deals with usage of computer vision as a way of interaction between human and computer. It introduces implementation of music library and audio player which is controlled by showing CD jewel cases of music albums and audio player paper control cards on a camera connected to a computer. This thesis describes algorithms for segmentation of an object from scene based on object's rectangular shape and matching that image with image database (music album database) using SURF feature detector. In conclusion, it summarizes achieved results and mentions some ideas and possibilities of further development.

De amordazamientos y liberaciones. Clausura simbólica y apertura poética en La noche de Ennio Moltedo

Este trabajo estudia la poética de la pérdida de la palabra en La noche de Ennio Moltedo. En este texto Moltedo explora los efectos que la dictadura chilena tiene en el cuerpo y la lengua de Chile de la postdictadura. El argumento está organizado en dos partes. Una que estudia las líneas de captura que reducen los discursos a formaciones molares; y, otra que estudia las líneas de escape a la molarización abriendo un espacio para la recuperación y refiguración del valor de la palabra

Review of Science Fiction and Digital Technologies in Argentine and Brazilian Culture by Edward King.

Review of Science Fiction and Digital Technologies in Argentine and Brazilian Culture by Edward King

The influence of local field corrections on Thomson scattering in non-ideal two-component plasmas

Thomson scattering in non-ideal (collision-dominated) two-component plasmas is calculated accounting for electron-ion collisions as well as electron-electron correlations. This is achieved by using a novel interpolation scheme for the electron-electron response function generalizing the traditional Mermin approach. Also, ions are treated as randomly distributed inert scattering centers. The collision frequency is taken as a dynamic and complex quantity and is calculated from a microscopic quantum-statistical approach. Implications due to different approximations for the electron-electron correlation, i.e. different forms of the OCP local field correction, are discussed

Simple model of the static exchange-correlation kernel of a uniform electron gas with long-range electron-electron interaction

A simple approximate expression in real and reciprocal spaces is given for the static exchange-correlation kernel of a uniform electron gas interacting with the long-range part only of the Coulomb interaction. This expression interpolates between the exact asymptotic behaviors of this kernel at small and large wave vectors which in turn requires, among other thing, information from the momentum distribution of the uniform electron gas with the same interaction that have been calculated in the G0W0 approximation. This exchange-correlation kernel as well as its complement analogue associated to the short-range part of the Coulomb interaction are more local than the Coulombic exchange-correlation kernel and constitute potential ingredients in approximations for recent adiabatic connection fluctuation-dissipation and/or density functional theory approaches of the electronic correlation problem based on a separate treatment of long-range and short-range interaction effects.Comment: 14 pages, 14 figures, to be published in Phys. Rev.

Density-to-potential map in time-independent excited-state density-functional theory

In light of the recent work by Sahni et al., Harbola, and Gaudoin and Burke, the question of mapping from an excited-state density of a many-electron interacting system to the potential of the related non-interacting system is analyzed. To do so, we investigate the Levy-Nagy criterion quantitatively for several excited-states. Our work indicates that Levy-Nagy criterion may fix the density to potential map uniquely

Kirzhnits gradient expansion for a D-dimensional Fermi gas

For an ideal D-dimensional Fermi gas under generic external confinement we derive the correcting coefficient $(D-2)/3D$ of the von Weizsacker term in the kinetic energy density. To obtain this coefficient we use the Kirzhnits semiclassical expansion of the number operator up to the second order in the Planck constant $\hbar$. Within this simple and direct approach we determine the differential equation of the density profile and the density functional of the Fermi gas. In the case D=2 we find that the Kirzhnits gradient corrections vanish to all order in $\hbar$.Comment: 6 pages, 0 figures, accepted for publication in J. Phys. A: Math. Theo

Structure of the Local-field factor of the 2-D electron fluid. Possible evidence for correlated scattering of electron pairs

The static local-field factor (LFF) of the 2-D electron fluid is calculated {\it nonperturbatively} using a mapping to a classical Coulomb fluid $\lbrack$Phys. Rev. Lett., {\bf 87}, 206$\rbrack$. The LFF for the paramagnetic fluid {\it differs markedly} from perturbation theory where a maximum near 2$k_F$ is expected. Our LFF has a quasi-linear small-k region leading to a maximum close to 3$k_F$, in agreent with currently available quantum Monte Carlo data. The structure in the LFF and its dependence on the density and temperature are interpretted as a signature of correlated scattering of electron pairs of opposite spin.The lack of structure at $2k_F$ implies weakened Friedel oscillations, Kohn anomalies etc.Comment: 4 pages, 3 figures, version 2 of condmat/0304034, see http://nrcphy1.phy.nrc.ca/ims/qp/chandre/chnc/ Changs in the text, figure 2 and updated reference

Anti-adiabatic limit of the exchange-correlation kernels of an inhomogeneous electron gas

We express the high-frequency (anti-adiabatic) limit of the exchange-correlation kernels of an inhomogeneous electron gas in terms of the following equilibrium properties: the ground-state density, the kinetic stress tensor, the pair-correlation function, and the ground-state exchange-correlation potential. Of these quantities, the first three are amenable to exact evaluation by Quantum Monte Carlo methods, while the last can be obtained from the inversion of the Kohn-Sham equation for the ground-state orbitals. The exact scalar kernel, in this limit, is found to be of very long range in space, at variance with the kernel that is used in the standard local density approximation. The anti-adiabatic xc kernels should be useful in calculations of excitation energies by time-dependent DFT in atoms, molecules, and solids, and provides a solid basis for interpolation between the low- and high-frequency limits of the xc kernels.Comment: 9 pages, 3 figures, to be submitted to PR