Productos de investigación: Envíos recientes
Mostrando ítems 1101-1120 de 1398
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Stationary axially symmetric relativistic thin discs with nonzero radial pressure
(2012)A detailed analysis of the surface energymomentum (SEMT) tensor of stationary axially symmetric relativistic thin discs with nonzero radial pressure is presented. The physical content of the SEMT is analysed and expressions ... -
An Infinite Family of Magnetized Morgan-Morgan Relativistic Thin Disks
(2012)Applying the Horský-Mitskievitch conjecture to the empty space solutions of Morgan and Morgan due to the gravitational field of a finite disk, we have obtained the corresponding solutions of the Einstein-Maxwell equations. ... -
Highly compact surface micromachined metamaterial circuits using multilayers of low-loss Benzocyclobutene for microwave and millimeter wave applications
(2012)This work explores the implementation of highly compact three dimensional (3D) integrable metamaterial based transmission lines on a low resistivity CMOS grade silicon substrate for microwave and millimeter wave applications. ... -
Harmonic analysis of shear deformable orthotropic cracked plates using the Boundary Element Method
(2012)In this work, the modal and harmonic analysis of orthotropic shear deformable cracked plates using a direct time-domain Boundary Element Method formulation based on the elastostatic fundamental solution of the problem is ... -
Perturbing the boundary conditions of the generator of a cosine family
(2012)Let A be a densely defined, closed linear operator (which we shall call maximal operator) with domain D(A) on a Banach space X and consider closed linear operators L:D(A)→∂X and Φ:D(A)→∂X (where ∂X is another Banach space ... -
Ultrasound image enhancement: A review
(2012)Medical ultrasound imaging uses pulsed acoustic waves that are transmitted and received by a hand-held transducer. This is a mature technology that it is widely used around the world. Among its advantages are that it is ... -
VSC with direct PI power control for frequency compensation in a microgrid: A PBC approach
(Institute of Electrical and Electronics Engineers Inc., 2019)The power systems with low inertia such as microgrids require advanced control strategies to improve their performance. These type of grids use voltage source converters to interconnect renewable energy sources and storage ... -
Development and/or change of the notion of permanent object and operative causality: Empirical evidence in the frst year of life
(Fundacion para el Avance de la Psicologia, 2013)This study examines the notion of permanent object during the first year of life, taking into account the controversy of two approaches about the nature of change: developmental change and cognitive change. Using a ... -
Static secure page allocation for light-weight dynamic information flow tracking
(2012)Dynamic information flow tracking (DIFT) is an effective security countermeasure for both low-level memory corruptions and high-level semantic attacks. However, many software approaches suffer large performance degradation, ... -
Supplier selection service-case study UTB
(2012)Supplier selection supported by methods based on computational tools are fundamental enterprise actions. This paper proposes the development of supplier selection model supported on a computational tool, using the purchasing ... -
A multi-user remote academic laboratory system
(2013)This article describes the development, implementation and preliminary operation assessment of Multiuser Network Architecture to integrate a number of Remote Academic Laboratories for educational purposes on automatic ... -
Male facial anthropometry and attractiveness
(2012)The symmetry and masculinity of the face are often considered important elements of male facial attractiveness. However, facial preferences are rarely studied on natural faces. We studied the effect of these traits and ... -
An omnidirectional wrappable compact patch antenna for wireless endoscope applications
(2012)An inductively loaded compact patch antenna for a radiation frequency of 433 MHz is designed taking into consideration a human-body model and fabricated on a flexible liquid crystalline polymer (LCP) substrate, which is ... -
Bridged composite right/left handed unit cell with all-pass and triple band response
(2012)A modified design of the composite right/left handed (CRLH) unit cell showing all-pass and triple band response is proposed. By using an additional inductance which cross-couples the input and output ports of the conventional ... -
Change and variability: A framework in studies on the first year of life
(Universidad Catolica de Colombia, 2013)This article presents empirical evidence of variability and change in the performance of young children in causality tasks, highlighting the relevance of nonlinear perspective in studies about the first year of life. Using ... -
Conformastatic disk-haloes in Einstein-Maxwell gravity
(2013)We present a relativistic model describing a thin disk surrounded by a halo in the presence of an electromagnetic field. The model is obtained by solving the Einstein-Maxwell equations on a particular conformastatic spacetime ... -
Fractional Fourier analysis of random signals and the notion of α -Stationarity of the Wigner-Ville distribution
(2013)In this paper, a generalized notion of wide-sense α-stationarity for random signals is presented. The notion of stationarity is fundamental in the Fourier analysis of random signals. For this purpose, a definition of the ... -
International technology adoption, R&D, and productivity growth
(Walter de Gruyter GmbH, 2013)International knowledge diffusion is considered an important source of productivity growth. However, direct observations on such diffusion have not been available at the macro level. We analyze novel data on international ... -
Capital Budgeting and Inflation
(John Wiley and Sons, 2013) -
Quality differentiation with flavors: Demand estimation of unobserved attributes
(Walter de Gruyter GmbH, 2013)This article estimates the demand for mint-flavored gum products using grocery store sales data and accounting for consumers' valuation of quality. Unobserved product attributes, such as flavor quality, are important ...
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.