3,917 research outputs found
Estudio y puesta en marcha de un sistema de eliminación de ácido sulfhÃdrico en una corriente de aire, mediante un biofiltro de escurrimiento con Thiobacillus Thioparus inmovilizado en espuma de poliuretano
El objetivo del presente trabajo es el estudio y puesta en marcha de un sistema de eliminación de ácido sulfhÃdrico en una corriente de aire, mediante el uso de un biofiltro de escurrimiento con Thiobacillus thioparus inmovilizado en espuma de poliuretano.
La consecución del objetivo antes descrito se llevará a través del conjunto de objetivos especÃficos que se detallan a continuación:
• Puesta a punto de las técnicas de crecimiento y conservación de la cepa.
• Estudio del proceso de inmovilización de Thiobacillus thioparus. Diseño de un protocolo de inmovilización.
• Estudio de la influencia de las principales variables de operación sobre la eficacia del proceso de eliminación de H2S por Th. thioparus inmovilizado en espuma de poliuretano utilizando un biofiltro de escurrimiento. Determinación de las capacidades y eficacias de eliminación.Proyecto PPQ2002-00217 del Plan Nacional de I+D+i titulado "Viabilidad de un procesos para la eliminación conjunta de H2S y NH3 contenido en efluentes gaseosos".49 página
Exponentially small asymptotic formulas for the length spectrum in some billiard tables
Let be a period. There are at least two -periodic
trajectories inside any smooth strictly convex billiard table, and all of them
have the same length when the table is an ellipse or a circle. We quantify the
chaotic dynamics of axisymmetric billiard tables close to their borders by
studying the asymptotic behavior of the differences of the lengths of their
axisymmetric -periodic trajectories as . Based on
numerical experiments, we conjecture that, if the billiard table is a generic
axisymmetric analytic strictly convex curve, then these differences behave
asymptotically like an exponentially small factor times
either a constant or an oscillating function, and the exponent is half of
the radius of convergence of the Borel transform of the well-known asymptotic
series for the lengths of the -periodic trajectories. Our experiments
are restricted to some perturbed ellipses and circles, which allows us to
compare the numerical results with some analytical predictions obtained by
Melnikov methods and also to detect some non-generic behaviors due to the
presence of extra symmetries. Our computations require a multiple-precision
arithmetic and have been programmed in PARI/GP.Comment: 21 pages, 37 figure
On the length and area spectrum of analytic convex domains
Area-preserving twist maps have at least two different -periodic
orbits and every -periodic orbit has its -periodic action for
suitable couples . We establish an exponentially small upper bound for
the differences of -periodic actions when the map is analytic on a
-resonant rotational invariant curve (resonant RIC) and is
"sufficiently close" to . The exponent in this upper bound is closely
related to the analyticity strip width of a suitable angular variable. The
result is obtained in two steps. First, we prove a Neishtadt-like theorem, in
which the -th power of the twist map is written as an integrable twist map
plus an exponentially small remainder on the distance to the RIC. Second, we
apply the MacKay-Meiss-Percival action principle.
We apply our exponentially small upper bound to several billiard problems.
The resonant RIC is a boundary of the phase space in almost all of them. For
instance, we show that the lengths (respectively, areas) of all the
-periodic billiard (respectively, dual billiard) trajectories inside
(respectively, outside) analytic strictly convex domains are exponentially
close in the period . This improves some classical results of Marvizi,
Melrose, Colin de Verdi\`ere, Tabachnikov, and others about the smooth case
Advances in Biogas Desulfurization
Global concern about climate change caused by the exploitation of fossil fuels is encouraging the use of renewable energies. For instance, the European Union aims to be climate neutral by 2050. Biogas is an interesting renewable energy source due to its high calorific value. Today, biogas is mainly used for the production of electricity and heat by a combined heat and power engine. However, before its valorization, biogas needs to be desulfurized (H2S removal) to avoid corrosion and sulfur oxides emissions during its combustion. Biogas can be upgraded (CO2 removal) and used as vehicle fuel or injected into the natural gas grid. In the last 15 years, significant advances have occurred in the development of biological desulfurization processes. In this book with five chapters, the reader can find some of the latest advances in the biogas desulfurization and an overview of the state-of-the-art research. Three of them are research studies and two are reviews concerning the current state of biogas desulfurization technologies, economic analysis of alternatives, and the microbial ecology in biofiltration units. Biogas desulfurization is considered to be essential by many stakeholders (biogas producers, suppliers of biogas upgrading devices, gas traders, researchers, etc.) all around the world
On the length and area spectrum of analytic convex domains
Area-preserving twist maps have at least two different (p, q)-periodic orbits and every (p, q)-periodic orbit has its (p, q)-periodic action for suitable couples (p, q). We establish an exponentially small upper bound for the differences of (p, q)-periodic actions when the map is analytic on a (m, n)-resonant rotational invariant curve (resonant RIC) and p/q is 'sufficiently close' to m/n. The exponent in this upper bound is closely related to the analyticity strip width of a suitable angular variable. The result is obtained in two steps. First, we prove a Neishtadt-like theorem, in which the n-th power of the twist map is written as an integrable twist map plus an exponentially small remainder on the distance to the RIC. Second,
we apply the MacKay-Meiss-Percival action principle. We apply our exponentially small upper bound to several billiard problems. The resonant RIC is a boundary of the phase space in almost all of them. For instance, we show that the lengths (respectively, areas) of all the (1, q)-periodic billiard (respectively, dual billiard) trajectories inside (respectively, outside) analytic strictly convex domains are exponentially close in the period q. This improves some classical results of Marvizi, Melrose, Colin de Verdiere, Tabachnikov, and others about the smooth case.Peer ReviewedPostprint (author's final draft
Hermenéutica jurÃdica y ética
Los operadores jurÃdicos, tradicionalmente, han acudido a la lógica ciega del silogismo y de la subsunción del caso, sin tener en cuenta la complejidad que encierra la vida cotidiana y sin explorar en el texto normativo, objeto de aplicación, un abanico abierto de posibilidades de interpretación, ya que se ha partido de modelos abstractos y genéricos para resolver bajo una misma medida todos los casos que se consideran similares
El debate sobre el fundamento de los derechos humanos
This article makes a reflection over a complex matter which is the conceptual grounds of Human Rights. It presents a historical-geographical compilation where it expounds over the various possibilities of conceptual grounds, without choosing any in specific. The importance of the philosophical argument should be acknowledged, despite being rejected by some postures such as those non-cognitive without failing to recognize the work towards the guarantee or the protection mechanisms of the human rights. Parting from Philosophy, it is possible to scrutinize and reflect with criticism over diverse aspects to be considered when studying the conceptual grounds of Human Rights.En este artÃculo se reflexiona sobre un asunto complejo como es la fundamentación de los derechos humanos. Se presenta una recopilación historiográfica en la que se expone sobre distintas posibilidades de fundamentación, sin optar por una en concreto. Debe reconocerse la importancia del argumento filosófico, pese a su rechazo desde posturas como las no-cognoscitivistas, sin desconocer el trabajo por la garantÃa o los mecanismos de protección de los derechos humanos. Desde la filosofÃa es posible escrutar y reflexionar crÃticamente sobre diversos aspectos a considerar cuando se estudia la fundamentación de los derechos humanos
El debido proceso
Due process is a basic right that contains principles and guarantees that are indispensable to observe in the diverse procedures, in order to obtain o substantially just solution, ahva’.s required within the framework of the Social. Democratic, and Law State. It is even one’s right to participate in a procedure handled by individuals with certain concrete qualities and functions carried out in conformity with those norms pre-established in the juridical ordinance, where it should be decided according to the pre-existent substantial law, as long as an opportunity is given to hear all the individuals that may get affected by the resolution adopted therein.El debido proceso es un derecho fundamental contentivo de principios y garantÃas que son indispensables de observar en diversos procedimientos para que se obtenga una solución sustancialmente justa, requerida siempre dentro del marco del estado social, democrático y de derecho. Es un derecho de toda persona a participar en un procedimiento dirigido por unos sujetos con unas cualidades y funciones concretas, desarrollado de conformidad con las normas preestablecidas en el ordenamiento jurÃdico, en los que se debe decidir conforme al derecho sustancial preexistente, siempre y cuando se de la oportunidad de oÃr o escuchar a todos los sujetos que puedan ser afectados con las resoluciones que allà se adopten
El derecho desde una actitud humanista
Frente a una tradición de idolatrÃa a la ley, los abogados tienen como desafÃo nutrirse de unas herramientas humanistas que les permitan comprometerse con el hombre mismo, en la defensa de su dignidad y su libertad. Sobre esta temática se centra este trabajo, confrontando en la cultura del derecho humano, el medio básico para la formación de abogados humanistas, que tanta falta hacen. El humanismo jurÃdico reclama de una vocación clara de los abogados por la hermenéutica, teniendo en cuenta que el Derecho ha de dirigirse por una orientación radicalmente hermenéutica, lo que permite superar la concepción decimonónica que se tenÃa sobre el mismo. El hombre encuentra en el Derecho la posibilidad de hallar una sociedad justa; por esto ha de procurar que el texto normativo no se fije y frene el dinamismo de la sociedad. La fundamentación humanista del Derecho positivo no es fácil, dado lo problemático que resulta comprender la realidad humana. No pueden desconocerse la individualidad ni la particularidad, aunque resulta importante descubrir el lugar peculiar que el hombre ocupa en el universo y para esto debe explorarse lo plural y la variedad cultural en la que se circunscribe el ser humano, sin que pueda abdicarse frente a una reverencia ciega por una "razón totalizadora"
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