Universidad Tecnológica de Bolivar UTB (Colombia): últimos ingresos
Mostrando ítems 2881-2900 de 11668
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Boundary element analysis of shear deformable shallow shells under harmonic excitation
(Tech Science Press, 2014)In this work, the harmonic analysis of shallow shells using the Boundary Element Method, is presented. The proposed boundary element formulation is based on a direct time-domain integration using the elastostatic fundamental ... -
Design of an electrogoniometer based on accelerometers for the evaluation of sports gesture in weight lifting
(Institute of Electrical and Electronics Engineers Inc., 2014)This article describes the design and implementation of an electrogoniometer to measure joint angles during the execution of weight lifting exercises. The electrogoniometer consists of four microelectromechanical accelerometers ... -
Study of the lower limp's angle during weightlifting exercises using an accelerometer-based system
(Institute of Electrical and Electronics Engineers Inc., 2014)This article describes the implementation and use of a two-accelerometer system to measure the angle formed between lower joints of weightlifters during the execution of the technical gesture. Being aware of movement between ... -
Design and construction of a Power Meter to optimize usage of the Electric Power
(Institute of Electrical and Electronics Engineers Inc., 2014)In this article, we present Electric Power Meter, a device that allows us to measure the energy consumption per electrical circuit even for each device at home. Detailed knowledge of the consumption of each device will ... -
Using close range photogrammetric method to estimate kinetic variables in olympic-style weightlifting
(Institute of Electrical and Electronics Engineers Inc., 2014)Olympic-style weightlifting, or weightlifting, is an athletic discipline that has as a goal lift the heaviest amount of weight attached a weight set. Weightlifting complements other athletic disciplines to increase power ... -
A density functional theory study of the reconstruction of gold (111) surfaces
(American Chemical Society, 2014)We studied (p × √3) gold (111) surface reconstructions within the DFT/PW91 approximation. Our findings clearly show that the reconstruction is energetically favorable in unreconstructed surfaces equal to or larger than the ... -
A three layer supply chain model with multiple suppliers, manufacturers and retailers for multiple items
(2014)The replenishment size/production lot size problem both for perfect and imperfect quality products studied in this paper is motivated by the optimal strategy in a three layer supply chain consisting of multiple suppliers, ... -
Fractional sampling theorem for -bandlimited random signals and its relation to the von neumann ergodic theorem
(Institute of Electrical and Electronics Engineers Inc., 2014)Considering that fractional correlation function and the fractional power spectral density, for -stationary random signals, form a fractional Fourier transform pair. We present an interpolation formula to estimate a random ... -
Vibrational response of elastic membranes coupled to acoustic fluids using a BEM–BEM formulation
(Springer New York LLC, 2014)In the last two decades, few works have been reported in the literature related to analysis of fluid–structure interaction problems using Boundary Element Method for modeling both structure and fluid. To the author’s ... -
Vibration analysis of shear deformable shallow shells using the Boundary Element Method
(2014)In this work, the modal and harmonic analysis of elastic shallow shells, using a Dual Reciprocity Boundary Element formulation, is presented. A boundary element formulation based on a direct time-domain formulation using ... -
Mechatronic design of an automated storage system located inside a confined space
(Institute of Electrical and Electronics Engineers Inc., 2014)It is here presented the mechatronic design of an system with automatic storing and picking of small products. The design concept presents the system as a four degrees-of-freedom robot capable of storing objects at different ... -
PBC approach applied on a DC-DC step-down converter for providing service to CPLs
(Institute of Electrical and Electronics Engineers Inc., 2019)This paper addresses the problem of output voltage regulation for step-down converters (buck converters) for constant power load (CPL) applications. The model of the CPL corresponds to a hyperbolic constraint that introduces ... -
Design of an electronic system for monitoring muscle activity in weight-lifting
(Institute of Electrical and Electronics Engineers Inc., 2014)Electronic systems based on body area networks can be used to monitor sports performance. These systems use sensors to acquire signals from the athlete while performing the exercises, and a communication system to transmit ... -
Microwave characteristics of sol-gel based Ag-doped (Ba 0.6Sr0.4)TiO3 thin films
(Elsevier, 2014)Dielectric Ba0.6Sr0.4TiO3 (BST) thin films with a different concentration of Ag-dopant of 0.5, 1, 1.5, 2, 3, and 5 mol % have been prepared using an alkoxide-based sol-gel method on a Pt(111)/TiO 2/SiO2/Si substrate and ... -
Power flow approximation for DC networks with constant power loads via logarithmic transform of voltage magnitudes
(Elsevier Ltd, 2019)This paper proposes a logarithmic transformation of voltages (LTVM) for the power flow in DC grids. This problem is non-linear due to the presence of constant power loads (CPLs), which also introduce a negative resistance ... -
Programmable diffractive optical elements for extending the depth of focus in ophthalmic optics
(SPIE, 2015)The depth of focus (DOF) defines the axial range of high lateral resolution in the image space for object position. Optical devices with a traditional lens system typically have a limited DOF. However, there are applications ... -
Improving the blind restoration of retinal images by means of point-spread-function estimation assessment
(SPIE, 2015)Retinal images often suffer from blurring which hinders disease diagnosis and progression assessment. The restoration of the images is carried out by means of blind deconvolution, but the success of the restoration depends ... -
Speckle reduction in echocardiography by temporal compounding and anisotropic diffusion filtering
(SPIE, 2015)Echocardiography is a medical imaging technique based on ultrasound signals that is used to evaluate heart anatomy and physiology. Echocardiographic images are affected by speckle, a type of multiplicative noise that ... -
QuBiLs-MAS method in early drug discovery and rational drug identification of antifungal agents
(Taylor and Francis Ltd., 2015)The QuBiLs-MAS approach is used for the in silico modelling of the antifungal activity of organic molecules. To this effect, non-stochastic (NS) and simple-stochastic (SS) atom-based quadratic indices are used to codify ... -
Millimeter-wave bandpass filter on LCP using CSRR-loaded triangular-shape quarter-mode substrate integrated waveguide
(John Wiley and Sons Inc., 2015)A millimeter-wave two-pole bandpass filter (BPF) with an asymmetrical frequency response is realized on a flexible liquid crystal polymer substrate for wearable/conformal wireless applications. The design uses the ...