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Exact relativistic models of thin disks around static black holes in a magnetic field
(2014)The exact superposition of a central static black hole with surrounding thin disk in presence of a magnetic field is investigated. We consider two models of disk, one of infinite extension based on a Kuzmin-Chazy-Curzon ... -
Implementation of an image based focusing algorithm for non-mydriatic retinal imaging
(Institute of Electrical and Electronics Engineers Inc., 2014)Retinal photography is important for the assessment of eye diseases. The task of fine focusing the image is demanding and lack of focus is often the cause of suboptimal photographs. The advent of digital cameras has provided ... -
Moral sentiment and reason: The notion of justice in Adam Smith and Amartya Sen
(Universidad Nacional de Colombia, 2014)Amartya Sen argues that his notion of justice has its origins in the thinking of Adam Smith. Sen employed, in a very particular way, the concepts of sympathy and the impartial spectator. Beyond the statement of Sen, we are ... -
Retinal image analysis oriented to the clinical task
(Universitat Autonoma de Barcelona, 2014) -
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 ... -
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 vision-based system for the dynamic measurement of in-plane displacements
(Institute of Electrical and Electronics Engineers Inc., 2014)Computer vision has advanced markedly in the last decade and has had new applications such as the analysis of the behavior of structures. The analysis of displacement and deformation of structures is an important process ... -
The dynamic model of a four control moment gyroscope system
(Universidad Nacional de Colombia, 2014)The dynamic model of a Four Control Moment Gyroscope (4-CMG) is traditionally obtained after computing the derivative of the angular momentum equation. Although this approach leads to a simple dynamic model, new models ... -
Chirp-wave expansion of the electron wavefunctions in atoms
(2014)The description of the electron wavefunctions in atoms is generalized to the fractional Fourier series. This method introduces a continuous and infinite number of chirp basis sets with linear variation of the frequency to ... -
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 ... -
Design of a brushed DC motors PID controller for development of low-cost robotic applications
(Institute of Electrical and Electronics Engineers Inc., 2014)This article present the design and construction of a PID controller for direct current motors motion control in low-cost robotic applications. The reasons which led us to the make the proposal and design of the system ... -
Effect of deficit irrigation on yield, quality, and costs of the production of native spearmint
(American Society of Civil Engineers (ASCE), 2014)Water-saving strategies aimed at improving water use efficiency need to be applied in agriculture today to ensure sustainable use of scarce water resources. This article presents results of a 2-year study done at Washington ... -
Beer snobs do exist: Estimation of beer demand by type
(Colorado State University, 2014)Although mass-produced beers still represent the vast majority of U.S. beer sales, there has been a significant growth trend in the craft beer segment. This study analyzes the demand for beer as a differentiated product ... -
Through-glass interposer integrated high quality RF components
(Institute of Electrical and Electronics Engineers Inc., 2014)High quality and compact RF devices, using the half mode substrate integrated waveguide (HMSIW) architecture loaded with a complementary split ring resonator (CSRR), are implemented on a glass interposer layer, which ... -
A surface micromachined broadband millimeter-wave filter using quarter-mode substrate integrated waveguide loaded with complementary split ring resonator
(Institute of Electrical and Electronics Engineers Inc., 2014)A millimeter-wave bandpass filter (BPF) using complementary split-ring resonator (CSRR) loaded quarter-mode substrate integrated waveguide (QMSIW) cavities is presented in this work. The CSRR-loaded QMSIW cavity resonates ... -
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 ... -
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 ... -
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 ... -
Hexagonal filters for ultrasound images
(2014)Most of the devices for acquisition and display of medical images use rectangular lattices even though there are other sampling strategies that can be more efficient in terms of resolution. This paper proposes an approach ...
Universidad Tecnológica de Bolívar - 2017 Institución de Educación Superior sujeta a inspección y vigilancia por el Ministerio de Educación Nacional. Resolución No 961 del 26 de octubre de 1970 a través de la cual la Gobernación de Bolívar otorga la Personería Jurídica a la Universidad Tecnológica de Bolívar.