107,001 research outputs found
Synthesis and X-Ray characterization of Copper(II) ternary complexes of p-aminobenzoic and cinnamate ligands with phenanthrolines
No full textMassive gravity: A general analysis
No full textMassive gravity can be described by adding to the Einstein-Hilbert action a function V of metric components. By using the Hamiltonian canonical analysis, we find the most general form of V such that five degrees of freedom propagate non perturbatively. The construction is based on a set of differential equations for V , that remarkably can be solved in terms of two arbitrary functions. Besides recovering the known “Lorentz invariant” massive gravity theory, we find an entirely new class of solutions, with healthy features on the phenomenological side, in particular they are weakly coupled in the solar system and have a high ultraviolet cutoff Λ2 = (mMpl)1/2, where m is the graviton mass scale
Recetario en busca de dueño: perfumería, medicina,y confitería en la casa del VII duque de Montalto (1635-1666)
No full textDocument number thirty from the manuscripts of the Count of Harrach, preserved in the Vienna State Archives, is an exceptionally interesting home recipe book that contains numerous personal annotations by a person whose identity we will reveal in this article. These insightful notes reveal details regarding the practices and use of perfume in a home of the nobility in the 17th century. Perfume waters, incense, pastilles and pomanders are some of the products that could be prepared by following the instructions in the recipes. A detailed analysis of the manuscript has led us to discover the owner and author of the annotations, as well as get a better understanding of the significance of perfume for the noble elite of the Spanish monarchy.El documento número treinta de la sección de manuscritos del conde de Harrach, conservado en el Archivo de Estado de Viena, es un recetario doméstico de notable interés en el que un desconocido personaje -cuya identidad se revela en este artículo- realizó numerosas anotaciones personales. Estas clarividentes notas desvelan los usos y prácticas del perfume en una casa nobiliaria del siglo XVII. Aguas de olor, pebetes, pastillas y pomas son algunos de los productos que se podían elaborar siguiendo las instrucciones de las recetas. Un detenido análisis del manuscrito nos ha permitido descubrir al dueño y autor de las anotaciones, además de profundizar en el significado del perfume para las élites nobiliarias de la monarquía hispánica
Nonderivative Modified Gravity: a Classification
No full textWe analyze the theories of gravity modified by a generic nonderivative potential built from the metric, under the minimal requirement of unbroken spatial rotations. Using the canonical analysis, we classify the potentials according to the number of degrees of freedom (DoF) that propagate at the nonperturbative level. We then compare the nonperturbative results with the perturbative DoF propagating around Minkowski and FRW backgrounds. A generic implies 6 propagating DoF at the non-perturbative level, with a ghost on Minkowski background. There exist potentials which propagate 5 DoF, as already studied in previous works. Here, no with unbroken rotational invariance admitting 4 DoF is found. Theories with 3 DoF turn out to be strongly coupled on Minkowski background. Finally, potentials with only the 2 DoF of a massive graviton exist. Their effect on cosmology is simply equivalent to a cosmological constant. Potentials with 2 or 5 DoF and explicit time dependence appear to be a further viable possibility.We analyze the theories of gravity modified by a generic nonderivative potential built from the metric, under the minimal requirement of unbroken spatial rotations. Using the canonical analysis, we classify the potentials V according to the number of degrees of freedom (DoF) that propagate at the nonperturbative level. We then compare the nonperturbative results with the perturbative DoF propagating around Minkowski and FRW backgrounds. A generic V implies 6 propagating DoF at the non-perturbative level, with a ghost on Minkowski background. There exist potentials which propagate 5 DoF, as already studied in previous works. Here, no V with unbroken rotational invariance admitting 4 DoF is found. Theories with 3 DoF turn out to be strongly coupled on Minkowski background. Finally, potentials with only the 2 DoF of a massive graviton exist. Their effect on cosmology is simply equivalent to a cosmological constant. Potentials with 2 or 5 DoF and explicit time dependence appear to be a further viable possibility.We analyze the theories of gravity modified by a generic nonderivative potential built from the metric, under the minimal requirement of unbroken spatial rotations. Using the canonical analysis, we classify the potentials according to the number of degrees of freedom (DoF) that propagate at the nonperturbative level. We then compare the nonperturbative results with the perturbative DoF propagating around Minkowski and FRW backgrounds. A generic implies 6 propagating DoF at the non-perturbative level, with a ghost on Minkowski background. There exist potentials which propagate 5 DoF, as already studied in previous works. Here, no with unbroken rotational invariance admitting 4 DoF is found. Theories with 3 DoF turn out to be strongly coupled on Minkowski background. Finally, potentials with only the 2 DoF of a massive graviton exist. Their effect on cosmology is simply equivalent to a cosmological constant. Potentials with 2 or 5 DoF and explicit time dependence appear to be a further viable possibility
"A tu per tu": un incontro ravvicinato e suadente con l'arte
No full textCon contributi di G. Milantoni e L. De Ross
Three-dimensional topology and Verlinde formulas
No full textWe study the properties of the gauge invariant observables of the
three-dimensional Chern-Simons field theory; it is shown that the algebra
structure determined by the observables is isomorphic with the fusion
rules of two-dimensional conformal theories. In the colour state space
of the link components, a projective representation of the modular group
is defined. The relations satisfied by the S matrix of the conformal
models admit an interpretation in terms of three-dimensional topology;
we describe the topological origin of these relations
Numerical simulation to improve individual cylinder AFR control in a 4 cylinder s.i. engine
No full textDevelopment of a new mean value model for the analysis of turbolag phenomena in automotive diesel engines
No full textNon-Abelian SU(3) Chern-Simons theory
No full textWe consider the non-Abelian SU(3) Chem-Simons field theory in a generic
three-manifold. We give the general expressions for the values of the
unknot and of the Hopf link in R3. The structure of the reduced tensor
algebra associated with SU(3) is reported and the surgery rules, which
permit us to solve the theory in a generic three-manifold, are derived.
We define a three-manifold invariant which is associated with the
non-abelian SU(3) Chem-Simons model. The value of this invariant is
computed for various three-manifolds
Análisis de monitoreo del Programa Ser Pilo Paga como estrategia de la educación
No full textEnsayo II Congreso Internacional COFACESEl actual ensayo busca determinar la importancia que tiene el programa Ser Pilo Paga como recurso para enmarcar las políticas del país en cuanto a educación y la vinculación de ésta con los objetivos del desarrollo a nivel mundial, además analiza si el programa como política y determina si los derroteros de eficiencia, equidad, legitimidad y eficacia se ven reflejados en el transcurso de la ejecución del programa.EspecializaciónEspecialista en Formulación y Evaluación Social y Económica de ProyectosRESUMEN
INTRODUCCIÓN
ANÁLISIS FRENTE A OBJETIVOS DE DESARROLLO
ANÁLISIS COMO POLÍTICA PÚBLICA.
ANÁLISIS DE EFICIENCIA DEL PROGRAMA SER PILO PAGA.
CONCLUSIONES.
BIBLIOGRAFÍ
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