826 resultados para Astronomía.
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The maximum performance of bare electrodynamic tethers as power generating systems under OML-theory is analyzed. Results show that best performance in terms of power density is achieved by designing the tether in such a way to increase ohmic impedance with respect to plasma contact impedance, hence favoring longer and thinner tethers. In such condition the corresponding optimal value of the load impedance is seen to approach the ohmic impedance of the conducting tether. At the other extreme, when plasma contact impedance dominates (which is not optimal but can be relevant for some applications) optimum power generation is found by matching the load impedance with an effective tether-plasma contact impedance whose expression is derived.
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We derive a semi-analytic formulation that permits to study the long-term dynamics of fast-rotating inert tethers around planetary satellites. Since space tethers are extensive bodies they generate non-keplerian gravitational forces which depend solely on their mass geometry and attitude, that can be exploited for controlling science orbits. We conclude that rotating tethers modify the geometry of frozen orbits, allowing for lower eccentricity frozen orbits for a wide range of orbital inclination, where the length of the tether becomes a new parameter that the mission analyst may use to shape frozen orbits to tighter operational constraints.
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Sign.: A12
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Sign.: [ ]4, [2 cristus]4, A-Z4, Aa-Ee4
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Datos de ed. a continuación de mención de resp
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Sign.: A-Z8, 2A-2M8
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que comprehende
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Que comprehende: Arquitectura civil ; Montea y canteria ; Arquitectura militar; pirotecnia y artilleria
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Que comprehende: Estatica; Hidrostatica; Hidrotechnia; Hidrometria
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Que comprehende: Trigonometria; secciones conicas; maquinaria
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datos de ed. a continuación de mención de resp
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Sign.: A-Z8, Aa-Dd8
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Uno de los principales objetivos de la radioastronomía es la determinación precisa do la posición de radio fuentes en el espacio.La posición resulta, por ejemplo, de suma importancia cuando se trata de identificar radiofuentes extra galácticas con fuentes ópticas, con objeto de poder así conocer la distancia de dicha fuente midiendo el desplazamiento del rojo.