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Search Results: 1 - 10 of 401513 matches for " M; Leyton "
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The Threat Factor: Elements of the Chilean Perception of Threat
Cristian M. Leyton Salas
Revista CIDOB d'Afers Internacionals , 2000,
Abstract: Despite systemic globalizing changes, state entities are still immersed in a perceived international state of nature. This characteristic immanent in state units makes them tend to perceive any action, intention, and/or capability of the states that surround them as potentially threatening to their economic, cultural, military and political security. Regardless of the degree of integration and cooperation between states, from the moment there is no suprastate body capable of monopolizing the use of legitimate force, the factor of threat constitutes the central characteristic of all international relations. This means that the factor of threat cannot in any case be suppressed but only controlled. Thus, it is necessary to shed light on both the concept as well as on the traditional factors of threat that have affect the political-military security of the Chilean state. Before going into the concept of cooperative security currently so much in fashion, we need to understand the traditional sources that have served as the foundation of, determined and influenced the country’s strategic positioning among the Southern Cone states. I propose, in conclusion, to deal with the theoreticalvacuum that has been shown to exist in the field of strategic studies in Chile.
APEXeditor: A Spreadsheet-Based Tool for Editing APEX Model Input and Output Files  [PDF]
Javier M. Osorio Leyton
Journal of Software Engineering and Applications (JSEA) , 2019, DOI: 10.4236/jsea.2019.1210027
Abstract: The APEXeditor, an Excel-based tool has been developed using the Visual Basic for Applications (VBA) to provide a graphical user interface (GUI) to the Agricultural Policy Environmental eXtender (APEX) model. APEX, in its native form, requires users to edit text files for modifying input files; therefore a GUI interface can aid users in modification of these files and reduce errors. Microsoft Excel is a popular spreadsheet program that has the largest user base among scientists and researchers, thus providing a relatively common platform in which stages the tool. The APEXeditor requires minimal additional learning to operate the tool for those who already have basic level of knowledge in Excel. The user can load APEX input files into the spreadsheet tool and the GUI offers meta information and provides functions to edit, write, and run the APEX model. Ultimately, the APEXeditor substitutes existing GUI programs such as WinAPEX or ArcAPEX that require installation or additional licensing. A series of scripts were developed as a back-end engine that automates data formatting and editing of linked APEX input ASCII files including database libraries. The simple architecture of the tool helps users maintain the quality of the data and allows error-free editing of APEX model inputs to characterize the system under study. This tool is suitable for all kinds of applications and has been successfully used for the creation of APEX model runs in numerous studies.
Minimum Bias and Underlying Event Studies at ATLAS and CMS
M. Leyton,for the ATLAS,CMS Collaborations
Physics , 2009,
Abstract: An overview of minimum bias and underlying event studies at the LHC with the ATLAS and CMS detectors is presented. Current uncertainties in the modeling of soft pp inelastic interactions at the LHC energy scale are discussed. Triggers used to select inelastic interactions at ATLAS and CMS are described and compared. A summary of some of the ongoing minimum bias and underlying event analyses by the ATLAS and CMS collaborations is given.
Qubit state detection using the quantum Duffing oscillator
V. Leyton,M. Thorwart,V. Peano
Physics , 2011, DOI: 10.1103/PhysRevB.84.134501
Abstract: We introduce a detection scheme for the state of a qubit, which is based on resonant few-photon transitions in a driven nonlinear resonator. The latter is parametrically coupled to the qubit and is used as its detector. Close to the fundamental resonator frequency, the nonlinear resonator shows sharp resonant few-photon transitions. Depending on the qubit state, these few-photon resonances are shifted to different driving frequencies. We show that this detection scheme offers the advantage of small back action, a large discrimination power with an enhanced read-out fidelity, and a sufficiently large measurement efficiency. A realization of this scheme in the form of a persistent current qubit inductively coupled to a driven SQUID detector in its nonlinear regime is discussed.
Quantum noise properties of multiphoton transitions in driven nonlinear resonators
V. Leyton,V. Peano,M. Thorwart
Physics , 2012, DOI: 10.1088/1367-2630/14/9/093024
Abstract: We investigate the quantum noise properties of a weakly nonlinear Duffing resonator in the deep quantum regime, where only few quanta are excited. This regime is dominated by the appearance of coherent multiphoton resonances in the nonlinear response of the resonator to the modulation. We determine simple expressions for the photon noise spectrum and find that the multiphoton resonances also induces a multiple peak structure in that noise. When the corresponding multiphoton Rabi oscillations are underdamped, zero temperature quantum fluctuations determine comparable populations of all quasienergy states which belong to a resonant multiphoton doublet. Most interestingly, the quantum fluctuations probe the multiphoton transitions by inducing several peaks in the noise spectrum of the resonator observables. In particular, the noise of the photon number contains complete information about the multiphoton states and their stationary populations via pairs of nearly symmetric peaks at opposite frequencies. Their widths are determined by the damping of the Rabi oscillations and their heights are proportional to the stationary nonequilbrium populations. A finite detuning from a multiphoton resonance generates a quasielastic noise peak at zero frequency. In addition, we relate the stationary populations of the quasienergy states with an effective quantum temperature and discuss the role of a finite temperature.
Descripción Histológica de las Glándulas Anexas del Aparato Digestivo de Avestruz (Struthio camelus var. domesticus)
Illanes,J; Fertilio,B; Quijada,M; Leyton,V; Verdugo,F;
International Journal of Morphology , 2006, DOI: 10.4067/S0717-95022006000400001
Abstract: in the last decade the upbringing of the ostrich in chile has increased substantially, for this reason it is necessary to increase the studies to improve the production of this species. the literature only points out studies on the physiology and anatomy of this species. the purpose of this work is to contribute to the knowledge of the normal histology from the annexed glands to the digestive system. this study was carried out clinically using 6 healthy ostriches, of which representative samples of the liver, proventricle and pancreas. histological sections were realized, mounted and stained for their comparative analysis under low light microscope to describe with those cited in the hen. the histology of the annexed glands from the digestive system is similar to the described in the hen. however, in the liver the arrangement hepatic cords so is in the central vein such as the portal spaces is radial, characteristic not observed in other species. in relation to the histology of the proventricle, the tubular glands are quite, similar to the fundic glands of the mammals. in the submucosa compound tubulosacular glands are observed, with parietal cells. the pancreas doesn't present prominent differences
Descripción Histológica de los Diferentes Segmentos del Aparato Digestivo de Avestruz (Struthio camelus var. domesticus)
Illanes,J; Fertilio,B; Chamblas,M; Leyton,V; Verdugo,F;
International Journal of Morphology , 2006, DOI: 10.4067/S0717-95022006000300015
Abstract: the rapid expansion and development of the ratites upbringing, it has implied scientific challenges and technicians to face this new type of farms systems in chile. the ostrich (struthio camelus var. domesticus), is an herbivore bird, forages eater and highly selective that present likeness and differences, with other birds and herbivores, among them the ruminant ones. enough envelopes their gastrointestinal anatomy is known, however its histology has not been investigated in depth. for this analysis it was obtained samples of the different segments of the tubular digestive tract of 6 clinically healthy ostriches. they were processed according to the techniques of average histology and analyzed to the optic microscope. the ostrich show an esophagus with longitudinal pleats in all their extension and in the mucosa there are simple and branching tubulosaccular glands. the proventriculus (glandular stomach) present a simple and branching tubular glands in the mucosa and compound tubulosaccular glands in the submucosa; a reinforcement of parallel bundles the compact tissues between the serous and the external longitudinal muscle. a small intestine with abundant villis and without paneth cells. the cecum in his luminal face, present a spiral pleat. the histological comparative analysis, allowed to establishing that the basic structure of the wall of the tubular digestive tract is similar to described in other species
Descripción Histológica de las Glándulas Anexas del Aparato Digestivo de Avestruz (Struthio camelus var. domesticus) Histologic Description of the Annexed Glands from the Ostrich Digestive System (Struthio camelus var. domesticus)
J Illanes,B Fertilio,M Quijada,V Leyton
International Journal of Morphology , 2006,
Abstract: En la última década, la crianza del avestruz en Chile ha ido aumentando sustancialmente, por lo cual se ha hecho necesario incrementar los estudios para mejorar la producción de esta especie. La literatura se ala sólo estudios sobre la fisiología y anatomía de esta especie. Nuestro objetivo es aportar al conocimiento de la histología normal de las glándulas anexas al aparato digestivo. Esta investigación se realizó con 6 avestruces clínicamente sanas, de las que se obtuvieron muestras representativas del hígado, pro ventrículo y páncreas. Se realizaron cortes histológicos, los que fueron te idos y montados para su análisis comparativo bajo microscopio de luz, entre avestruz y gallina. La histología de las glándulas anexas del aparato digestivo es semejante a la descrita en la gallina. Sin embargo, en el hígado los cordones de hepatocitos se disponen en forma radial, tanto alrededor de la vena central como de los espacios porta, característica no observada en otras especies. Con respecto al pro ventrículo, en la mucosa se observan glándulas tubulares simples o ramificadas, semejantes a las glándulas fúndicas de los mamíferos. En la submucosa se observan glándulas túbuloalveolares compuestas con células parietales. El páncreas no presenta diferencias destacables In the last decade the upbringing of the ostrich in Chile has increased substantially, for this reason it is necessary to increase the studies to improve the production of this species. The literature only points out studies on the physiology and anatomy of this species. The purpose of this work is to contribute to the knowledge of the normal histology from the annexed glands to the digestive system. This study was carried out clinically using 6 healthy ostriches, of which representative samples of the liver, proventricle and pancreas. Histological sections were realized, mounted and stained for their comparative analysis under low light microscope to describe with those cited in the hen. The histology of the annexed glands from the digestive system is similar to the described in the hen. However, in the liver the arrangement hepatic cords so is in the central vein such as the portal spaces is radial, characteristic not observed in other species. In relation to the histology of the proventricle, the tubular glands are quite, similar to the fundic glands of the mammals. In the submucosa compound tubulosacular glands are observed, with parietal cells. The pancreas doesn't present prominent differences
Descripción Histológica de los Diferentes Segmentos del Aparato Digestivo de Avestruz (Struthio camelus var. domesticus) Histologic Description of the Different Segments from the Ostrich Digestive System (Struthio camelus var. domesticus)
J Illanes,B Fertilio,M Chamblas,V Leyton
International Journal of Morphology , 2006,
Abstract: La expansión y rápido desarrollo de la crianza de ratites, ha implicado desafíos científicos y técnicos para enfrentar este nuevo tipo de explotación en Chile. El avestruz (Struthio camelus var. domesticus), es un ave herbívora, forrajera y altamente selectiva, que presentan semejanzas y diferencias con otras aves y herbívoros, entre ellos los rumiantes. Se conoce bastante sobre su anatomía gastrointestinal, sin embargo, su histología no ha sido investigada en profundidad. Para este análisis, se obtuvieron muestras de los diferentes segmentos del tubo digestivo de 6 avestruces adultas, clínicamente sanas. Se procesaron de acuerdo a las técnicas de histología corriente y analizadas al microscopio óptico. El avestruz muestra un esófago con pliegues longitudinales en toda su extensión y en su mucosa glándulas tubuloalveolares simples y ramificadas. Un proventrículo (estómago glandular) con glándulas tubulares simples y ramificadas en la mucosa y tubuloalveolares compuestas en la submucosa; un refuerzo de tejido conjuntivo compacto de haces paralelos, entre la serosa y la capa muscular longitudinal externa. Un intestino delgado, con abundantes vellosidades y ausencia de células de Paneth. Un ciego que, en su cara luminal, presenta un pliegue en espiral. El análisis histológico comparativo permitió establecer que la estructura básica de la pared del tubo digestivo es semejante a la descrita en otras especies The rapid expansion and development of the ratites upbringing, it has implied scientific challenges and technicians to face this new type of farms systems in Chile. The ostrich (Struthio camelus var. domesticus), is an herbivore bird, forages eater and highly selective that present likeness and differences, with other birds and herbivores, among them the ruminant ones. Enough envelopes their gastrointestinal anatomy is known, however its histology has not been investigated in depth. For this analysis it was obtained samples of the different segments of the tubular digestive tract of 6 clinically healthy ostriches. They were processed according to the techniques of average histology and analyzed to the optic microscope. The ostrich show an esophagus with longitudinal pleats in all their extension and in the mucosa there are simple and branching tubulosaccular glands. The proventriculus (glandular stomach) present a simple and branching tubular glands in the mucosa and compound tubulosaccular glands in the submucosa; a reinforcement of parallel bundles the compact tissues between the serous and the external longitudinal muscle. A small intestine with abund
Computational Analysis of Perfect-Information Position Auctions
David R. M Thompson,Kevin Leyton-Brown
Computer Science , 2014,
Abstract: After experimentation with other designs, the major search engines converged on the weighted, generalized second-price auction (wGSP) for selling keyword advertisements. Notably, this convergence occurred before position auctions were well understood (or, indeed, widely studied) theoretically. While much progress has been made since, theoretical analysis is still not able to settle the question of why search engines found wGSP preferable to other position auctions. We approach this question in a new way, adopting a new analytical paradigm we dub "computational mechanism analysis." By sampling position auction games from a given distribution, encoding them in a computationally efficient representation language, computing their Nash equilibria, and then calculating economic quantities of interest, we can quantitatively answer questions that theoretical methods have not. We considered seven widely studied valuation models from the literature and three position auction variants (generalized first price, unweighted generalized second price, and wGSP). We found that wGSP consistently showed the best ads of any position auction, measured both by social welfare and by relevance (expected number of clicks). Even in models where wGSP was already known to have bad worse-case efficiency, we found that it almost always performed well on average. In contrast, we found that revenue was extremely variable across auction mechanisms, and was highly sensitive to equilibrium selection, the preference model, and the valuation distribution.
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