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Correlación de la resistencia a compresión uniaxial con la humedad y porosidad eficaz en rocas

Resumen: Esta investigación, consiste en la determinación del parámetro mecánico de resistencia a compresión Uniaxial en la roca y su correlación con la humedad y porosidad eficaz, propiedades físicas de la roca. Por su objetivo de estudio, el proyecto se englob

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Parámetros configurables de capa física y MAC de un nuevo estándar de TDT con canal de retorno inalámbrico para proporcionar conectividad a Internet en zonas rurales de Latinoamérica

Resumen: Este artículo propone una guía para la configuración de los parámetros de capa física y MAC de un nuevo estándar de televisió n digital terrestre (TDT) de segunda generación con canal de retorno inalámbrico denominado DVB -RCT2, particularizando

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High performance control of a three-phase PWM rectifier using odd harmonic high order repetitive control

Abstract: The control goal for three-phase pulse width-modulated rectifie rs focuses on generating sinusoidal input currents and regulati ng the DC output voltage. Despite the fact that control strategies such a s resonant and repetitive control have been proposed i

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FPGA implementation of the AES-128 algorithm in non-feedback modes of operation

Abstract: In this paper, we present a hardware implementation of the pipelined AES -128 algorithm that works on non-feedback modes of operation (ECB and CTR). The architecture was implemented using the Xili nx Virtex 5 FPGA platform. We compared two m

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Determination of the domain dimensions in embankment numerical modeling

Abstract: This article presents a study of the influence of subdomain dim ensions on the stress-strain sta te of road embankments. Its pur pose is to determine the most advisable distance from the base of the slop e to the boundary condition using computational numer

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Modeling and behavior of the simulation of electric propagation during deep brain stimulation

Abstract: Deep brain stimulation (DBS) is an effective treatment for Parkinson's disease. In the literature, there are a wide variety o f mathematical and computational models to describe electric propagation during DBS; however unfortunately, t

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A hybrid partitioning method for multimedia databases

Abstract: Hybrid partitioning has been recognized as a technique to achieve query optimization in relational and object -oriented databases. Due to the increasing availability of multimedia applications, there is an interest in using par

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Characterization of supply chain problems

Abstract: The current contribution intends to identify, characterize and provide context to the most usual supply chain problems. One hu ndred and twenty three SC problems were identified and addressed in a specific a rea that locates them within the context of the f

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Algorithm for wideband spectrum sensing based on sparse Fourier transform

Abstract: In this paper we present a novel sub-Nyquist algorithm to perform Wideband Spectrum Sensing (WSS) for Cognitive Radios (CRs) by using the recently developed Sparse Fast Fourier Transform (sFFT) algorithms. In this case, we developed a noise -robust sub-Nyqui

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Transient analysis of mixed wind parks with different turbine types

Abstract: The variable-speed wind turbine is widely used in new wind park s and became the dominant type of wind turbine due to its techn ological advantages. However, in the case of already installed wind parks based on fixed speed wind turbines, the immediate migra

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New robust capability ratios approaches for quality control

Abstract: Robus tness of process capability measurements is a very important matter in statistical quality control. In this paper, two new cl asses of capability measurements are studied as robust mechanisms to detect the influence of factors that may c

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Effect of elastoplastic behavior on the impact response of expanded metal tubes

Abstract: This paper presents a numerical study on the effect of the elas toplastic behavior of the material on the structural response o f expanded metal tubes subjected t o impact loads. The study is carried out using the finite element method, considering two mat

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Modelado fenomenológico e identificación paramétrica aplicada al monitoreo de una correa transportadora en una mina de cobre

Abstract: This paper investigates the modeling of a belt conveyor system for use in an automated monitoring system aiming at obtain improved energetic performance and fault diagnosis capability of the system. Firstly, a phenomenological model of the process is discuss

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State observer design for biomass and ethanol estimation in bioreactors using cybernetic models

Abstract: Over recent years, the problem of multi-substrate microbial-growth modeling has received more and more attention. However, the re is no evidence in the literature referring to state observer design that is ap plied to microbial growth described by cybernetic

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Use of white rot fungi in the degradation of an azo dye from the textile industry

Abstract: Textile industry effluents —a complex mix of chemicals, among which colorants are of particular concern —impose great environmental challenges. In this study, a full 2 3 factorial design was used for determining the best conditions for the degradation of te

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The mechanical properties of Portland cement mortars blended with carbon nanotubes and nanosilica: A study by experimental design

Abstract: The pozzolanic effect of nanosilica (NS) particles when combined with Multi Walled Carbon Nanotubes (MWCNT) was studied in Ca(OH) 2 pastes and Portland cement mortars. Experimental design techniqu es were used to plan the experiments and i

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Método para determinar las pérdidas totales en transformadores de distribución a partir del porcentaje de carbono de la chapa de acero al silicio

Abstract: Transformers are electrical devices that are responsible for the distribution and management of electrical power. In Latin America the recycling of silicon steel sheet transformer is very common and therefore it s construction is very important because we mu

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Methodology for hydrodynamic model selection. Case study: spatial variability of the thermal structure in the Riogrande II tropical reservoir, Colombia

Abstract: This article presents a methodology for a guided selection of a hydrodynamic model to study physical processes in a reservoir. It is based on both qualitative and quantitative criteria that are applied in order to study the spatial variability of the the

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Facile one-pot synthesis of uniform silver nanoparticles and growth mechanism
Daniel Ramirez Franklin Jaramillo

Abstract: Size controlled silver nanoparticles were obtained via chemical reduction using one -pot synthesis. Differently from other reported methods for silver nanoparticles, 1-octanol was used as both solvent and reduct ion agent, oleylamine and oleic acid acted as

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