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Search Results: 1 - 10 of 25190 matches for " Francisco Ciofalo Zu?iga "
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El síndrome judicial
Francisco Ciofalo Zuiga
Medicina Legal de Costa Rica , 2000,
Abstract:
Mechanical impulse propagation in a packing of 3D spheres confined at constant pressure
Francisco Santibanez,Rene Zuiga,Francisco Melo
Physics , 2015,
Abstract: Mechanical impulse propagation in granular media depends strongly on the imposed confinement conditions. In this work, the propagation of sound in a granular packing contained by flexible walls that enable confinement under hydrostatic pressure conditions is investigated. This configuration also allows the form of the input impulse to be controlled by means of an instrumented impact pendulum. The main characteristics of mechan- ical wave propagation are analyzed, and it is found that the wave speed as function of the wave amplitude of the propagating pulse obeys the predictions of the Hertz contact law. Upon increasing the confinement pressure, a continuous transition from nonlinear to linear propagation is observed. Our results show that in the low-confinement regime, the attenuation increases with an increasing impulse amplitude for nonlinear pulses, whereas it is a weak function of the confinement pressure for linear waves.
El cálculo en carreras de ingeniería: un estudio cognitivo
Zuiga, Leopoldo;
Revista latinoamericana de investigación en matemática educativa , 2007,
Abstract: this paper reports a cognitive study of a qualitative character in relation to the learning of the two variable functions and partial derivative concepts in the engineering context. it defends the fact that didactic settings in context can be conducive to a logical meaningful learning for the student with sense in the future professional area. this motivated us to research what happened at cognitive levels for students in this type of didactic environment. the theoretical framework is described by the study of cognitive functioning in a mental act of learning (the process of resolving problem). the analysis reports the experience which results in the implementation of didactic setting designs with one group of engineering students.
Estimando un Modelo de 2 Factores del Tipo
Sergio Zu?±iga
Revista de Análisis Económico (RAE) , 1999,
Abstract: In this article we estimate a two-factor model for the risk-free term structure yield in Chile. These factors are the short rate and the central tendency that are not directly estimable. Both factors follow an Ito stochastic process. In the solution of the model we follow the Balduzzi et al. (1996) specification, which provides an estimation procedure that do not depend on the parametric specification of the second factor and an "exponential affine" solution type that allows to estimate the model by mean of only one equation. The data used in this study is the average weekly yields of the bonds "Bonos de Reconocimiento" (BR) of the Chilean stock exchange during May 1993 and December 1997. The results show that when we use a stochastic level for the long term rates the yields adjust better than the case when this level is constant. Also, the speed of the reversion process increases due to the better performance of the short term rate. In addition, using an ARCH specification for the rate volatility we found additional evidence that the variance of the rates. In this article we estimate a two-factor model for the risk-free term structure yield in Chile. These factors are the short rate and the central tendency that are not directly estimable. Both factors follow an Ito stochastic process. In the solution of the model we follow the Balduzzi et al. (1996) specification, which provides an estimation procedure that do not depend on the parametric specification of the second factor and an "exponential affine" solution type that allows to estimate the model by mean of only one equation. The data used in this study is the average weekly yields of the bonds "Bonos de Reconocimiento" (BR) of the Chilean stock exchange during May 1993 and December 1997. The results show that when we use a stochastic level for the long term rates the yields adjust better than the case when this level is constant. Also, the speed of the reversion process increases due to the better performance of the short term rate. In addition, using an ARCH specification for the rate volatility we found additional evidence that the variance of the rates.
JUVENTUD, CRIMEN Y MUERTE: EL NAUFRAGIO DE LOS JOVENES OLVIDADOS
Enrique Zuiga
Archivos de Criminología, Criminalística y Seguridad Privada , 2011,
Abstract:
Conductance in diffusive quasi-one-dimensional periodic waveguides: a semiclassical and random matrix study
Jaime Zuiga Vukusich
Physics , 2012,
Abstract: We study quantum transport properties of finite periodic quasi-one-dimensional waveguides whose classical dynamics is diffusive. The system we consider is a scattering configuration, composed of a finite periodic chain of $L$ identical (classically chaotic and finite-horizon) unit cells, which is connected to semi-infinite plane leads at its extremes. Particles inside the cavity are free and only interact with the boundaries through elastic collisions; this means waves are described by the Helmholtz equation with Dirichlet boundary conditions on the waveguide walls. The equivalent to the disorder ensemble is an energy ensemble, defined over a classically small range but many mean level spacings wide. The number of propagative channels in the leads is $N$. We have studied the (adimensional) Landauer conductance $g$ as a function of $L$ and $N$ in the cosine-shaped waveguide and by means of our RMT periodic chain model. We have found that $$ exhibit two regimes. First, for chains of length $L\lesssim\sqrt{N}$ the dynamics is diffusive just like in the disordered wire in the metallic regime, where the typic ohmic scaling is observed with $ = N/(L+1)$. In this regime, the conductance distribution is a Gaussian with small variance but which grows linearly with $L$. Then, in longer systems with $L\gg\sqrt{N}$, the periodic nature becomes relevant and the conductance reaches a constant asymptotic value $ \sim $. The variance approaches a constant value $\sim\sqrt{N}$ as $L\to\infty$. Comparing the conductance using the unitary and orthogonal circular ensembles we observed that a weak localization effect is present in the two regimes.
Epidemiological changes and financial consequences of hypertension in Latin America: implications for the health system and patients in Mexico
Arredondo, Armando;Zuiga, Alexis;
Cadernos de Saúde Pública , 2012, DOI: 10.1590/S0102-311X2012000300010
Abstract: the aim of this study was to assess the costs and financial consequences of epidemiological changes in hypertension in méxico. the cost evaluation method to estimate costs was based on instrumentation techniques. to estimate the epidemiological changes and expected cases of hypertension in 2010-2012, three probabilistic models were constructed according to the box-jenkins technique. comparing the economic impact, from 2010 to 2012 there will be a 24% increase in financial requirements (p < 0.05). the total cost of hypertension in 2011 will be us$ 5,733,350,291, including us$ 2,718,280,941 in direct costs and us$ 3,015,069,350 in indirect costs. if the risk factors and various healthcare models remain unaltered in the institutions analyzed here, the financial consequences will have a major impact on users' pockets, followed by social security providers and public healthcare providers. the authors suggest a revision in the planning, organization, and allocation of resources, particularly programs for health promotion and prevention of hypertension.
LAS CONCEPCIONES DE LA NATURALEZA DE DARWIN Y GOETHE, DISCUTIDAS POR TRES FILóSOFOS ALEMANES (NIETZSCHE, CASSIRER Y SIMMEL)
Zuiga Rengifo Nestor Javier
Acta Biológica Colombiana , 2009,
Abstract: RESUMEN En este artículo se presentan las semejanzas y diferencias entre las concepciones de la naturaleza de Darwin y Goethe, discutidas por tres filósofos Alemanes: Friedrich Nietzsche, Ernst Cassirer y Georg Simmel. La discusión se centra principalmente en reconocer el método histórico del cambio caprichoso funcional por parte de los tres filósofos como un principio estructuralista de la metodología histórica y las diferencias sobre los enfoques explicativos, El goethiano morfológico y el darwiniano funcionalista. Nietzsche y Cassirer integran en sus filosofías aspectos de la teoría morfológica goethiana, y aunque reconocen en la teoría de Darwin la importancia de la explicación histórica, rechazan lo que ellos consideran la permanencia de la explicación teleológica en la teoría de Darwin. Simmel establece una relación entre las concepciones de Goethe y Darwin por medio del concepto de acción. Palabras clave: Descendencia con modificación, Metamorfosis, Cambio caprichoso funcional, Filosofía alemana, Acción ABSTRACT The conceptions of the nature of Darwin and Goethe, discussed by three German philosophers (Nietzsche, Simmel and Cassirer)
Alternative Post-Processing on a CMOS Chip to Fabricate a Planar Microelectrode Array
Francisco López-Huerta,Agustín L. Herrera-May,Johan J. Estrada-López,Carlos Zuiga-Islas,Blanca Cervantes-Sanchez,Enrique Soto,Blanca S. Soto-Cruz
Sensors , 2011, DOI: 10.3390/s111110940
Abstract: We present an alternative post-processing on a CMOS chip to release a planar microelectrode array (pMEA) integrated with its signal readout circuit, which can be used for monitoring the neuronal activity of vestibular ganglion neurons in newborn Wistar strain rats. This chip is fabricated through a 0.6 μm CMOS standard process and it has 12 pMEA through a 4 ?′ 3 electrodes matrix. The alternative CMOS post-process includes the development of masks to protect the readout circuit and the power supply pads. A wet etching process eliminates the aluminum located on the surface of the p+-type silicon. This silicon is used as transducer for recording the neuronal activity and as interface between the readout circuit and neurons. The readout circuit is composed of an amplifier and tunable bandpass filter, which is placed on a 0.015 mm2 silicon area. The tunable bandpass filter has a bandwidth of 98 kHz and a common mode rejection ratio (CMRR) of 87 dB. These characteristics of the readout circuit are appropriate for neuronal recording applications.
CONTROL JUDICIAL DE LOS ACTOS POLíTICOS: RECURSO DE PROTECCIóN ANTE LAS "CUESTIONES POLíTICAS"
Zú?iga Urbina,Francisco;
Ius et Praxis , 2008, DOI: 10.4067/S0718-00122008000200008
Abstract: the article do analyse the doctrine of acts of state and the "political questions", conceived today an anacronism anconciliate with the rule of law. that's doctrine have today an position in constitutional democracy, that permit to establish an limit at judicial control of the acts of states, when result of government's function the state, down the modality of power exclusive the organs supreme of state, or to concern the political questions remain in the space at deliberative public of citizenship.
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