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Search Results: 1 - 10 of 8681 matches for " Cristian Garita Rojas "
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Desarrollo de una metodología de crianza en laboratorio del gusano cogollero del maíz Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) como posible hospedante de insectos biocontroladores de interés agrícola
Yerlin Chacón Castro,Cristian Garita Rojas,Christopher Vaglio Cede?o,Vladimir Villalba Velásquez
Tecnología en Marcha , 2009,
Abstract: Con el fin de desarrollar una metodología de crianza en laboratorio que permita la producción masiva de organismos biocontroladores de Spodoptera frugiperda, se colectó ejemplares en estado larval en cultivares de maíz de diferentes localidades de Costa Rica. Dichas larvas fueron transportadas hasta el Laboratorio de Biocontroladores del CIB-ITCR, Cartago. Al inicio del ensayo, las larvas fueron alimentadas con hojas tiernas de maíz por espacio de dos meses. Luego se evaluó la dieta artificial BIO-MIX H-89, modificada para el desarrollo de huevo hasta pupa y durante la fase de adulto, se utilizó una solución de miel de abeja al 10% (v/v) como fuente de alimento. Se aplicó un ANOVA para medir las diferencias entre cada etapa del ciclo de vida con ambas dietas y se encontró que al implementar la dieta artificial, se redujo elciclo de vida de esta especie a 45,10±1,20 días, y se prolongó el periodo larval a 26,80±1,41 días. Asimismo, se identificó el hongo entomopatógeno Beauveria bassiana como controlador biológico de esta especie.
José Zapiola como escritor y los inicios de la crítica musical y de la musicografia en Chile
Guerra Rojas,Cristian;
Revista musical chilena , 2008, DOI: 10.4067/S0716-27902008000100002
Abstract: this article deals with the chilean musician and writer josé zapiola cortés (1802-1885) and his contribution in the beginnings ofboth musical criticism and musicography in chile. as a hypothesis it is put forward that zapiola was not a man ofletters but a musician ofletters, who, because of family and social reasons, triedto build his personal and professional identity in the chilean music milieu, at the time when the project ofmodernity was established in chile. on the basis ofthis hypothesis, the ideas that he presents in his books la sociedad de la igualdad y sus enemigos, recuerdos de treinta a?os and his commentaries in the semanario musical are analyzed. in these works, zapiola prepared the groundfor both aproper musical criticism and a criticism of musical institutions in chile, specially in the case ofthe national conservatory of music founded in 1849.
EL RECURSO DE NULIDAD LABORAL COMO HERRAMIENTA DE CONTROL DE LAS EXIGENCIAS IMPUESTAS POR LA SANA CRíTICA A PROPóSITO DE LA SENTENCIA ROL 1068-2010 DE LA COTE DE APELACIONES DE SANTIAGO
Cristian Contreras Rojas
Revista de Derecho (Coquimbo) , 2011,
Abstract:
José Zapiola como escritor y los inicios de la crítica musical y de la musicografia en Chile José Zapiola as Writer in the Beginnings of Musical Criticism and Writing on Music in Chile
Cristian Guerra Rojas
Revista musical chilena , 2008,
Abstract: El presente artículo aborda la figura del músico chileno José Zapiola Cortés (1802-1885) como escritor y su contribución en los inicios de la crítica musical y de la musicografia en Chile. La hipótesis es que Zapiola no fue un hombre de letras sino que un músico letrado, que, por razones familiares y sociales, buscó afirmar su identidad personal y profesional en el mundo de la música, dentro del marco de la imposición del proyecto de la modernidad en Chile. Sobre esta hipótesis se busca explicar las ideas que aporta en sus libros La Sociedad de la Igualdad y sus enemigos, Recuerdos de treinta a os y sus comentarios en el Semanario Musical (1852). En ellos Zapiola sienta las bases no solamente de una crítica musical propiamente tal, sino de una crítica de la institucionalidad musical, especialmente en el caso del Conservatorio Nacional de Música fundado en 1849. This article deals with the Chilean musician and writer José Zapiola Cortés (1802-1885) and his contribution in the beginnings ofboth musical criticism and musicography in Chile. As a hypothesis it is put forward that Zapiola was not a man ofletters but a musician ofletters, who, because of family and social reasons, triedto build his personal and professional identity in the Chilean music milieu, at the time when the project ofmodernity was established in Chile. On the basis ofthis hypothesis, the ideas that he presents in his books La Sociedad de la Igualdad y sus enemigos, Recuerdos de Treinta A os and his commentaries in the Semanario Musical are analyzed. In these works, Zapiola prepared the groundfor both aproper musical criticism and a criticism of musical institutions in Chile, specially in the case ofthe National Conservatory of Music founded in 1849.
Ramón Carnicer y Batlle (1789-1855), II dissoluto punito, ossiaDon Giovanni Tenorio. CD
Cristian Guerra Rojas
Revista musical chilena , 2007,
Abstract:
EL VéRTICE AMBIGUO: ENSAYOS SOBRE LA CASACIóN CIVIL
Cristian Contreras Rojas
Ius et Praxis (En línea) , 2009,
Abstract:
Reduced Complexity Filtering with Stochastic Dominance Bounds: A Convex Optimization Approach
Vikram Krishnamurthy,Cristian Rojas
Statistics , 2014, DOI: 10.1109/TSP.2014.2362886
Abstract: This paper uses stochastic dominance principles to construct upper and lower sample path bounds for Hidden Markov Model (HMM) filters. Given a HMM, by using convex optimization methods for nuclear norm minimization with copositive constraints, we construct low rank stochastic marices so that the optimal filters using these matrices provably lower and upper bound (with respect to a partially ordered set) the true filtered distribution at each time instant. Since these matrices are low rank (say R), the computational cost of evaluating the filtering bounds is O(XR) instead of O(X2). A Monte-Carlo importance sampling filter is presented that exploits these upper and lower bounds to estimate the optimal posterior. Finally, using the Dobrushin coefficient, explicit bounds are given on the variational norm between the true posterior and the upper and lower bounds.
Critical properties of two-dimensional Josephson junction arrays with zero-point quantum fluctuations
Cristian Rojas,Jorge V. José
Physics , 1996, DOI: 10.1103/PhysRevB.54.12361
Abstract: We present results from an extensive analytic and numerical study of a two-dimensional model of a square array of ultrasmall Josephson junctions. We include the ultrasmall self and mutual capacitances of the junctions, for the same parameter ranges as those produced in the experiments. The model Hamiltonian studied includes the Josephson, $E_J$, as well as the charging, $E_C$, energies between superconducting islands. The corresponding quantum partition function is expressed in different calculationally convenient ways within its path-integral representation. The phase diagram is analytically studied using a WKB renormalization group (WKB-RG) plus a self-consistent harmonic approximation (SCHA) analysis, together with non-perturbative quantum Monte Carlo simulations. Most of the results presented here pertain to the superconductor to normal (S-N) region, although some results for the insulating to normal (I-N) region are also included. We find very good agreement between the WKB-RG and QMC results when compared to the experimental data. To fit the data, we only used the experimentally determined capacitances as fitting parameters. The WKB-RG analysis in the S-N region predicts a low temperature instability i.e. a Quantum Induced Transition (QUIT). We carefully simulations and carry out a finite size analysis of $T_{QUIT}$ as a function of the magnitude of imaginary time axis $L_\tau$. We find that for some relatively large values of $\alpha=E_C/E_J$ ($1\leq \alpha \leq 2.25)$, the $L_\tau\to\infty$ limit does appear to give a {\it non-zero} $T_{QUIT}$, while for $\alpha \ge 2.5$, $T_{QUIT}=0$. We use the SCHA to analytically understand the $L_\tau$ dependence of the QMC results with good agreement between them. Finally, we also carried out a WKB-RG analysis in the I-N region and found no evidence of a low temperature QUIT, up to lowest order in ${\alpha}^{-1}$
Superconducting to normal state phase boundary in arrays of ultrasmall Josephson junctions
Jorge V. José,Cristian Rojas
Physics , 1994, DOI: 10.1016/0921-4526(94)90100-7
Abstract: We study the competition between Josephson and charging energies in two-dimensional arrays of ultrasmall Josephson junctions, when the mutual capacitance is dominant over the self-capacitance. Our calculations involve a combination of an analytic WKB renormalization group approach plus nonperturbative Quantum Monte Carlo simulations. We consider the zero frustration case in detail and we are able to make a successful comparison between our results and those obtained experimentally.
On change point detection using the fused lasso method
Cristian R. Rojas,Bo Wahlberg
Statistics , 2014,
Abstract: In this paper we analyze the asymptotic properties of l1 penalized maximum likelihood estimation of signals with piece-wise constant mean values and/or variances. The focus is on segmentation of a non-stationary time series with respect to changes in these model parameters. This change point detection and estimation problem is also referred to as total variation denoising or l1 -mean filtering and has many important applications in most fields of science and engineering. We establish the (approximate) sparse consistency properties, including rate of convergence, of the so-called fused lasso signal approximator (FLSA). We show that this only holds if the sign of the corresponding consecutive changes are all different, and that this estimator is otherwise incapable of correctly detecting the underlying sparsity pattern. The key idea is to notice that the optimality conditions for this problem can be analyzed using techniques related to brownian bridge theory.
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