4,494 research outputs found
Comment on the numerical solutions of a new coupled MKdV system (2008 Phys. Scr. 78 045008)
In this comment we point out some wrong statements in the paper by Inc and
Cavlak, Phys. Scr. 78 (2008) 04500
Application of the Asymptotic Iteration Method to a Perturbed Coulomb Model
We show that the asymptotic iteration method converges and yields accurate
energies for a perturbed Coulomb model. We also discuss alternative
perturbation approaches to that model.Comment: 9 pages, 2 figures, 1 tabl
Simple one-dimensional quantum-mechanical model for a particle attached to a surface
We present a simple one-dimensional quantum-mechanical model for a particle
attached to a surface. We solve the Schr\"odinger equation in terms of Weber
functions and discuss the behavior of the eigenvalues and eigenfunctions. We
derive the virial theorem and other exact relationships as well as the
asymptotic behaviour of the eigenvalues. We calculate the zero-point energy for
model parameters corresponding to H adsorbed on Pd(100) and also outline the
application of the Rayleigh-Ritz variational method
The confined hydrogen atom with a moving nucleus
We study the hydrogen atom confined to a spherical box with impenetrable
walls but, unlike earlier pedagogical articles on the subject, we assume that
the nucleus also moves. We obtain the ground-state energy approximately by
means of first--order perturbation theory and by a more accurate variational
approach. We show that it is greater than the one for the case in which the
nucleus is clamped at the center of the box. Present approach resembles the
well-known treatment of the helium atom with clamped nucleus
Accurate calculation of resonances in multiple-well oscillators
Quantum--mechanical multiple--well oscillators exhibit curious complex
eigenvalues that resemble resonances in models with continuum spectra. We
discuss a method for the accurate calculation of their real and imaginary
parts
System dynamics modelling in systems biology and applications in pharmacology
El modelado matemático de sistemas biolĂłgicos complejos es uno de los temas clave en la BiologĂa de Sistemas y varios mĂ©todos computacionales basados ​​en la simulaciĂłn computarizada han sido aplicados hasta ahora para determinar el comportamiento de los sistemas no lineales. La Dinamica de Sistemas es una metodologĂa de modelado intuitivo basada en el razonamiento cualitativo por el cual un modelo conceptual se puede describir como un conjunto de relaciones de causa y efecto entre las variables de un sistema. A partir de esta estructura, es posible obtener un conjunto de ecuaciones dinámicas que describan cuantitativamente el comportamiento del sistema. Centrándose en los sistemas farmacolĂłgicos, el modelado compartimental a menudo se utiliza para resolver un amplio espectro de problemas relacionados con la distribuciĂłn de materiales en los sistemas vivos en la investigaciĂłn, el diagnĂłstico y la terapia en todo el cuerpo, los Ăłrganos y los niveles celulares.
En este artĂculo presentamos la metodologĂa de modelado de Dinámica del Sistema y su aplicaciĂłn al modelado de un modelo compartimental farmacocinĂ©tico-farmacodinámico del efecto de profundidad anestĂ©sica en pacientes sometidos a intervenciones quirĂşrgicas, derivando un modelo de simulaciĂłn en el entorno de simulaciĂłn orientada a objetos OpenModelica. La Dinamica de Sistemas se puede ver como una herramienta educativa poderosa y fácil de usar y en la enseñanza de BiologĂa de Sistemas.Universidad de Málaga. Campus de Excelencia Internacional AndalucĂa Tech
Conversación, diálogo y lenguaje en el pensamiento de Hans-Georg Gadamer
To cope with the intersubjective and communicative deficiencies of Heidegger's Analytics of Existence, Hans-Georg Gadamer developed a theory of language whose nature is at one time phenomenological and ontological. Inspired by Plato's dialectics and Aristotle's ethical and rhetorical works, Gadamer sees human linguistic capabilities as the defining trait of all that is human. Language lives in conversation, dialogically structuring all social and cultural relations. Language is the ambit in which human beings and their historical world take place. In Gadamer's thought, logos replaces being as the ontological support. In such a way, Gadamer's hermeneutical philosophy seeks to fill the void opened by the 20th century deconstruction of metaphysics
Bank lending, financing constraints and SME investment
SME investment opportunities depend on the level of financing constraints that firms face. Earlier research has mainly focused on the controversial argument that cash flow-investment correlations increase with the level of these constraints. We focus on bank loans rather than cash flow. Our results show that investment is sensitive to bank loans for unconstrained firms but not for constrained firms, and trade credit predicts investment, but only for constrained firms. We also find that unconstrained firms use bank loans to finance trade credit provided to other firms. Our results illustrate alternative mechanisms that firms employ both as borrowers and lenders.Bank loans ; Investments
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