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Search Results: 1 - 10 of 5586 matches for " Markus Faller "
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Seguridad contra incendios en edificios con atrio
Faller, George
Informes de la Construccion , 2003,
Abstract: Atria are commonly used in the design of buildings to improve the environment of the space. Nevertheless the current Spanish codes do not address the fire safety concerns associated with this type of building. A new draft code, the "Código Técnico de la Edificación .. (CTE), proposes a series of measures to address the issue of fire safety in atria, based on the approach adopted by the British atrium codeo. In order to simplify the application of the measures, buildings are classified according to use and appropriate measures are presented in a tabulated format. As could be expected from such an approach, the simplification of the pro cess imposes limits on design flexibility, and given a set of prescribed solutions, the designer would often not be able to achieve the ideal building form. This article discusses the limits of a prescriptive approach to fire safety in buildings with atria , and describes an alternative approach based on fire engineering principles that offers the architect more design flexibilty . Cada vez se utilizan más atrios para mejorar el ambiente dentro de los edificios. Sin embargo, las normativas actualmente vigentes en Espa a no ofrecen soluciones para abordar los riesgos -en caso de incendio- en este tipo de edificios. El borrador del nuevo Código Técnico de la Edificación (CTE) plantea una serie de medidas de seguridad contra incendios en atrios, basada en el planteamiento seguido en por las normas británicas. Para simplificar la aplicación de dichas medidas, se fijan algunas características del edificio y se ofrecen soluciones basadas en medidas obtenidas de una tabla . Como es era de esperar con este tipo de planteamiento, la facilidad de aplicación va en detrimento de la flexibilidad, y resulta que con las soluciones prescritas el dise ador no puede conseguir la forma deseada en el edificio. Este artículo trata de ilustrar las restricciones que conllevan un planteamiento prescriptivo para la seguridad contra incendios en atrios. y plantea una alternativa basada en la ingeniería contra incendios, la cual ofrecerá más flexibilidad de dise o al arquitecto.
Effective Field Theory of Gravity: Leading Quantum Gravitational Corrections to Newtons and Coulombs Law
Sven Faller
Physics , 2007, DOI: 10.1103/PhysRevD.77.124039
Abstract: In this paper we consider general relativity and its combination with scalar quantum electrodynamics (QED) as an effective quantum field theory at energies well below the Planck scale. This enables us to compute the one-loop quantum corrections to the Newton and Coulomb potential induced by the combination of graviton and photon fluctuations. We derive the relevant Feynman rules and compute the nonanalytical contributions to the one-loop scattering matrix for charged scalars in the nonrelativistic limit. In particular, we derive the post-Newtonian corrections of order $Gm/\text c^2 r$ from general relativity and the genuine quantum corrections of order $G\hbar/\text c^3 r^2$.
Structure and mobility of cyclohexane as a solvent for Trans-Polyisoprene
Roland Faller
Physics , 2002, DOI: 10.1039/b111437a
Abstract: Solutions of {\it trans}$-$polyisoprene in cyclohexane are investigated in atomistic detail at different compositions at two different temperatures. We investigate the influence of polymer concentration on the dynamics of the solvent molecules and the structure of the solvation shell. The double bonds along the polymer backbone are preferentially approached by the solvent molecules. The mobility of cyclohexane molecules decreases with increasing polymer concentration at ambient conditions. The reorientation of molecules becomes more anisotropic with concentration as the polymer hinders the reorientation of the molecular plane. At elevated temperatures the influence of the polymer is weaker and the reorientation of the solvent is more isotropic. Additionally, a fast and efficient way to set up atomistic simulations is shown in detail in which the initial simulations increase in length and in the simulation time-step. The excess energy from initial overlaps is removed by resetting the velocities at regular intervals.
Automatic Coarse Graining of Polymers
Roland Faller
Physics , 2003, DOI: 10.1016/j.polymer.2003.11.053
Abstract: Several recently proposed semi--automatic and fully--automatic coarse--graining schemes for polymer simulations are discussed. All these techniques derive effective potentials for multi--atom units or super--atoms from atomistic simulations. These include techniques relying on single chain simulations in vacuum and self--consistent optimizations from the melt like the simplex method and the inverted Boltzmann method. The focus is on matching the polymer structure on different scales. Several ways to obtain a time-scale for dynamic mapping are discussed additionally. Finally, similarities to other simulation areas where automatic optimization are applied as well are pointed out.
Properties of Poly (isoprene) - Model Building in the Melt and in Solution
Roland Faller,Dirk Reith
Physics , 2002, DOI: 10.1021/ma025877s
Abstract: Properties of 1,4-\textit{trans} poly (isoprene) at ambient conditions are determined by simulations on two length scales based on two different models: a full-atomistic and a mesoscopic one. The models are linked via a mapping scheme such that one mesoscopic bead represents one chemical repeat unit. Melts as well as solutions of several chain lengths were investigated and mapped individually to the meso-scale. The resulting models are compared to each other. The meso-scale models could be simulated over a large variety of chain lengths and time-scales relevant for experimental comparison. Concerning static properties, we determined the persistence length of our systems and the scaling behavior of the radius of gyration. The latter was compared to experiments and the agreement is satisfactory. Furthermore, we find deviations from Rouse dynamics at all chain lengths at ambient conditions.
Phase chaos in the anisotropic complex Ginzburg-Landau Equation
R. Faller,L. Kramer
Physics , 1997, DOI: 10.1103/PhysRevE.57.R6249
Abstract: Of the various interesting solutions found in the two-dimensional complex Ginzburg-Landau equation for anisotropic systems, the phase-chaotic states show particularly novel features. They exist in a broader parameter range than in the isotropic case, and often even broader than in one dimension. They typically represent the global attractor of the system. There exist two variants of phase chaos: a quasi-one dimensional and a two-dimensional solution. The transition to defect chaos is of intermittent type.
Markovian log-supermodularity, and its applications in phylogenetics
Mike Steel,Beata Faller
Quantitative Biology , 2008,
Abstract: We establish a log-supermodularity property for probability distributions on binary patterns observed at the tips of a tree that are generated under any 2--state Markov process. We illustrate the applicability of this result in phylogenetics by deriving an inequality relevant to estimating expected future phylogenetic diversity under a model of species extinction. In a further application of the log-supermodularity property, we derive a purely combinatorial inequality for the parsimony score of a binary character. The proofs of our results exploit two classical theorems in the combinatorics of finite sets.
Trait-dependent extinction leads to greater expected biodiversity loss
Beata Faller,Mike Steel
Quantitative Biology , 2009,
Abstract: We use a classical combinatorial inequality to establish a Markov inequality for multivariate binary Markov processes on trees. We then apply this result, alongside with the FKG inequality, to compare the expected loss of biodiversity under two models of species extinction. One of these models is the generalized version of an earlier model in which extinction is influenced by some trait that can be classified into two states and which evolves on a tree according to a Markov process. Since more than one trait can affect the rates of species extinction, it is reasonable to allow, in the generalized model, k binary states that influence extinction rates. We compare this model to one that has matching marginal extinction probabilities for each species but for which the species extinction events are stochastically independent.
A master equation approach to option pricing
Daniel Faller,Francesco Petruccione
Quantitative Finance , 2002, DOI: 10.1016/S0378-4371(02)01530-3
Abstract: A master equation approach to the numerical solution of option pricing models is developed. The basic idea of the approach is to consider the Black--Scholes equation as the macroscopic equation of an underlying mesoscopic stochastic option price variable. The dynamics of the latter is constructed and formulated in terms of a master equation. The numerical efficiency of the approach is demonstrated by means of stochastic simulation of the mesoscopic process for both European and American options.
When neurological symptoms hides a nephrologic pathology and a cardiac abnormality  [PDF]
Clotilde Muller, Bernadette Faller, Fran?ois Sellal, Fran?ois Chantrel
Open Journal of Internal Medicine (OJIM) , 2011, DOI: 10.4236/ojim.2011.11002
Abstract: We bring report the case of a young woman who presents with neurological symptoms, and to which the practised investigations led to the discovery in chain of unexpected pathologies. These neurological disorders were revealing of the picture associating a nephrotic syndrome and a patent foramen ovale. This foramen was the major route of a rain of emboles ring peripheral favored by the nephrotic syndrome towards the cerebral hemispheres.
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