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Search Results: 1 - 10 of 9748 matches for " Pablo Angueira "
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Extending the Shannon Upper Bound Using Spiral Modulation
Jon Montalban,Jon Barrueco,Pablo Angueira,Jerrold D. Prothero
Mathematics , 2015,
Abstract: The Shannon upper bound places a limit on the error-free information transmission rate (capacity) of a noisy channel. It has stood for over sixty years, and underlies both theoretical and practical work in the telecommunications industry. This upper bound arises from the Shannon-Hartley law, which has two parameters: the available bandwidth and the signal-to-noise power ratio. However, aside from these explicit parameters, the Shannon-Hartley law also rests on certain assumptions. One of these is that the channel is linear: recent work has shown that nonlinear channels are not limited by the Shannon upper bound. A second assumption, arising from the mathematical tools used in its proof, is that signals are periodic. Surprisingly, the capacity limit associated with non-periodic signals has not previously been examined. Here we show, both theoretically and by construction, that the use of non-periodic signals, based on complex spirals, allows the Shannon upper bound to be extended.
Enhanced Operation of Electricity Distribution Grids Through Smart Metering PLC Network Monitoring, Analysis and Grid Conditioning
Alberto Sendin,I?igo Berganza,Aitor Arzuaga,Xabier Osorio,Iker Urrutia,Pablo Angueira
Energies , 2013, DOI: 10.3390/en6010539
Abstract: Low Voltage (LV) electricity distribution grid operations can be improved through a combination of new smart metering systems’ capabilities based on real time Power Line Communications (PLC) and LV grid topology mapping. This paper presents two novel contributions. The first one is a new methodology developed for smart metering PLC network monitoring and analysis. It can be used to obtain relevant information from the grid, thus adding value to existing smart metering deployments and facilitating utility operational activities. A second contribution describes grid conditioning used to obtain LV feeder and phase identification of all connected smart electric meters. Real time availability of such information may help utilities with grid planning, fault location and a more accurate point of supply management.
Tasas de respiración en cuatro híbridos de pimentón (capsicum annum l.)
Angueira,Mercedes; Sandoval,Aleida J; Barreiro,José A.;
Interciencia , 2003,
Abstract: the respiration rates of four comercial hybrids of peppers (capsicum annum l.) stored at 10oc were determined using a respirometer built in the laboratory, based on the principle of collection of the co2 arising from fruit respiration. the co2 produced was 24.6-56.2mg·kg-1·h-1, corresponding in thermal units to 66-151w·t-1. it was found that hybrids with a width/length ratio close to unity showed lower weight losses.
Sorption characteristics of fermented cocoa powder (Theobroma cacao)
Sandoval,Aleida J; Barreiro,José A; Tovar,Xiomara; Angueira,Mercedes;
Revista Técnica de la Facultad de Ingeniería Universidad del Zulia , 2002,
Abstract: water isotherms of fermented (venezuelan fine first grade) cocoa beans (theobroma cacao) were determined at three temperatures: 5°c, 15°c and 30°c, in ground samples. the data obtained were adjusted to several regression models in order to determine the best fit. differences were not significant among between the determined isotherms, being all data adjusted to a single isotherm in the temperature range used. the halsey equation was suggested for fitting data. this equation is valid for the usual interval of water activity in the product. it could be used another equation that shows a good regression coefficient. an increased sorption enthalpy value was obtained as the temperature raised.
Environmental stress upon hepatopancreatic cells of freshwater prawns (Decapoda: Caridea) from the floodplain of Paraná River  [PDF]
Pablo Collins
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.27094
Abstract: In order to evaluate the influence of stressed environments on hepatopancreatic cells of fre- shwater prawns, Macrobachium borellii Nobili, 1896 and Palaemonetes argentinus Nobili 1901, (Crustacea, Decapoda, Palaemonidae) were collected at three different aquatic environments with different relationship to urban development in Argentina. Furthermore the effects of several cypermethryn concentration on hepa- topancreatic cell of M. borellii and P. argentinus were evaluated in a laboratory assays. The “N° 1” lake (Santa Fe Argentina) which is more affected by the anthropogenic pressure and “Don Felipe” lake which is still not strongly by human activities were the studied sites from the floodplain of Paraná river. While Alejandra lake was the intermedia effects sites. Different damaged ultra-structures were found in F- and R-cells of prawns in the stressed lake. The predominant features were: disrupted the microvillous border, swelled mitochondria, reduction of endoplasmic reticulum, dyctiosomes, glycoproteins, desna-turalization of vacuole membrane and premature autolysis. Moreover the F-cell number was higher in the environment near to city than in the others sites. Similar effects were observed in the cypermethryn assays. The observations clearly indicate that the ultrastructure of midgut gland in the both palaemonids varies depending on the site from which animals are collected and the biocid presence. So, in this case it can be stated that the hepatopancreas histology of fre- shwater prawns is a good tool to monitor the impact of a stressed environment upon freshwater prawns.
Monitorización de úlceras por presión en una Unidad de cuidados intensivos Monitorization of pressure ulcers in a critical care Unit
José A. Esperón Güimil,Celsa Angueira Castelo,Ana I. Escudero Qui?ones,Ana Ocampo Pi?eiro
Gerokomos , 2007,
Abstract: Introducción: Las úlceras por presión (UPP) son un indicador de mala calidad asistencial. Los pacientes ingresados en Unidades de cuidados intensivos presentan gran número de factores de riesgo de padecer UPP, siendo de las Unidades con mayores índices de incidencia. Objetivos: Determinar la prevalencia de UPP y el paciente tipo que desarrolla UPP. Material y métodos: Estudio prospectivo de prevalencia. Variables dependientes: no de UPP (no de UPP excluyendo las iatrogénicas); no de UPPY (no de UPP iatrogénicas) y no de UPPT (no de UPP + no de UPPY). Variables independientes: sexo, edad, diagnóstico, riesgo Nova 4, estadios, índice de severidad, localizaciones, fechas de registro de las UPP, medidas preventivas. Análisis: Paquete estadístico G-Stat 2.0. Descriptivo: media y desviación estándar; frecuencias relativas y absolutas. Inferencial: T-Student, ANOVA, modelo de regresión lineal. Significación estadística de p< 0,05; IC 95%. Resultados: Prevalencia de UPP del 12,7%; Prevalencia de UPPY: 6,8%. Registradas 142 UPP, origen iatrogénico en 45 lesiones. Localizaciones más frecuentes: sacro y talones y con componente iatrogénico, nariz, labios, orejas. Factores causales de UPPY: 49% por tubo endotraqueal y sistema de fijación; 42% por sonda nasogástrica. Se registró un mayor número de lesiones en los pacientes quirúrgicos. Paciente tipo: varón, 63 a os, diagnóstico quirúrgico, riesgo alto de padecer UPP. Sólo existe asociación estadísticamente significativa entre la variable no de UPP y la utilización de superficies especiales para el manejo de la presión (D.M.: -0,553; IC95%: -1,089, -0,017), p= 0,04. Discusión: La iatrogenia aparece como un componente importante en la aparición de las UPP. Es fundamental clasificar los pacientes en niveles de riesgo de sufrir UPP realizando una valoración continuada. El uso de superficies especiales para el manejo de la presión influye positivamente en que la media de UPP que presentan los pacientes sea menor. Introduction: Pressure ulcers (PU) are an indicator of poor assistance quality. Patients in units of intensive care present a considerable number of risk factors of suffering UPP, in fact, these units are among with a higher of incidence of PUs. Objectives: To determine the prevalence of PUs and the type of patient who develops PUs. Material and methods: Prospective study of prevalence. Dependent variables: no. of PUs (no. of PUs, excluding iatrogenic ones); no. of IPUs (no. of iatrogenic PU) and no. of TPUs (no. of PUs + no. of IPUs). Independent variables: sex, age, diagnostic, risk Nova 4, stadiums, Index of s
A Note on Price Asymmetry Using a Monetary Model  [PDF]
Pablo L. Schiaffino, Juan Pablo Pinasco
Theoretical Economics Letters (TEL) , 2014, DOI: 10.4236/tel.2014.48088
Abstract: In this paper we present a macroeconomic foundation of downward money price inflexibility based on classical Monetary Economics. We show that under the principle of risk aversion and the neutral money axiom, our model derives an endogenous asymmetric price response as prices adjust more rapidly when they go upward than downward. This asymmetry does not disappear; on the contrary, it is increasing in time.
Influenza epidemics and Spanish climatic domains  [PDF]
Pablo Fdez-Arroyabe
Health (Health) , 2012, DOI: 10.4236/health.2012.430144
Abstract: The present article proposes a climatic approach to the study of the interaction between influenza spreading and climatic and meteorological factors in different climatic domains of the Iberian Peninsula. This association can be used to help in the prevention and mitigation of influenza epidemics. A biometeorological index has been defined and applied to the epidemic periods that took place in the Iberian Peninsula between 2000 and 2009 considering its climatic domains.
Microarrays de DNA en el cáncer oral
Otero Rey,Eva; García García,Abel; Barros Angueira,Francisco; Torres Espa?ol,María; Gándara Rey,José Manuel; Somoza Martín,Manuel;
Medicina Oral, Patología Oral y Cirugía Bucal (Ed. impresa) , 2004,
Abstract: one of the principal aims of modern cancer research is to identify markers allowing individual prediction of prognosis or response to treatment. in this connection, the number of genes thought to be involved in the different stages of different types of oral cancer increases apace. dna microarrays allow simultaneous evaluation of the expression of hundreds of genes in a single assay. the parallel format of microassay slides is designed to allow rapid comparison of gene expression between two samples, for example tumor cells and healthy cells. this article reviews studies that have aimed to identify genes related to oral cancer, and to classify these genes into groups that are commonly co-expressed. these studies suggest that dna microarrays are set to become routine tools in the detection, diagnosis, characterization and treatment of oral cancers.
An Iterative Method for Solving Two Special Cases of Lane-Emden Type Equation  [PDF]
Pedro Pablo Cárdenas Alzate
American Journal of Computational Mathematics (AJCM) , 2014, DOI: 10.4236/ajcm.2014.43021
Abstract:

In this work we apply the differential transformation method or DTM for solving some classes of Lane-Emden type equations as a model for the dimensionless density distribution in an isothermal gas sphere \"\" and as a study of the gravitational potential of (white-dwarf) stars ,\"\" which are nonlinear ordinary differential equations on the semi-infinite domain [1] [2]. The efficiency of the DTM is illustrated by investigating the convergence results for this type of the Lane-Emden equations. The numerical results show the reliability and accuracy of this method.

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