La Universidad Pedagógica y Tecnológica de Colombia best known as "La UPTC," is a Colombian public university located primarily in Tunja and it maintains presence in 7 Colombian departments. It is considered to be one of the most important and prestigious universities of the country due to their academic level.It has a headquartera, three sectional branches, six sites for extension programs and 21 regional centers for distance learning in which there are 11 faculties, 52 undergraduate academic programs, 15 undergraduate academic distance programs and 23 postgraduate programs. It is an educational, scientific and technological university, currently ranked number 7 among the best 64 universities in Colombia according to a study by Research Sapiens Group research sapiens that built a ranking, which was titled "U-Sapiens Ranking Colombia" where are cataloged 64 universities of the country. Wikipedia.
Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, paleoclimatic and tectonic implications [Evidencias de una edad miocena temprana-media de la formación navidad: Implicancias paleontológicas, paleoclimáticas y tectónicas]
Gutierrez N.M.,University of Chile |
Hinojosa L.F.,University of Chile |
Le Roux J.P.,University of Chile |
Pedroza V.,Pedagogical and Technological University of Colombia
Andean Geology | Year: 2013
The age of the Navidad Formation in central Chile has always been controversial, mainly due to the conflicting age ranges indicated by its macro- and microfossils. Macrofossils are generally interpreted as having been reworked from older, Early to Middle Miocene strata, whereas a Late Miocene-Pliocene age has been accepted on the basis of planktonic foraminifer index species. The results of this study, however, indicate that the macrofossils occur in situ, which necessitates a complete revision of the geochronological data. It is concluded that the evidence for an Early to Middle Miocene age is overwhelming, and that the planktonic foraminifer index species must have appeared in the SE Pacific earlier than elsewhere. These include Globoturborotalia apertura, Globorotalia puncticulata (Deshayes), Globorotalia spheriomizea (Walters), Neogloboquadrina pachyderma (Ehrenberg), and Neogloboquadrina acostaensis (Blow). An Early to Middle Miocene age for the Navidad Formation correlates well with a reinterpretation of its depositional environment as a continental shelf instead of a deepwater continental slope, global and regional paleoclimatic events, and the tectonic development of the Andes Range.
Reyes Gomez F.,Pedagogical and Technological University of Colombia |
Mejia-Salazar J.R.,Federal University of Alagoas
Optics Letters | Year: 2015
We show the existence of a defect mode within the plasmonpolariton gap in 1D defective photonic superlattices, composed by alternating layers of conventional dielectric (A) and negative refractive (B) material slabs with a dielectric defective layer (D), which, in the nonlinear regime, can be tuned by means of the incident field intensity. Also, we have shown that the self-induced transparency phenomena can be only observed when gap-soliton modes, coupled through the defective layer, are excited in both mirror systems around the defective slab. © 2015 Optical Society of America.
Camarchia V.,Polytechnic University of Turin |
Fang J.,Polytechnic University of Turin |
Moreno Rubio J.,Pedagogical and Technological University of Colombia |
Pirola M.,Polytechnic University of Turin |
Quaglia R.,Polytechnic University of Turin
IEEE Microwave and Wireless Components Letters | Year: 2013
Design and characterization of a 7 GHz MMIC GaN Doherty Power Amplifier on TriQuint technology are presented. To the best of the authors' knowledge, the present circuit, suitable for C-band point-to-point backhaul applications, represents the first example of a working MMIC GaN Doherty. Large signal measurements, averaged over 16 MMICs, exhibited power gain of 10 dB, saturated output power in excess of 37 dBm (3 dB gain compression), together with drain efficiency of 47%, at 7 dB of output back-off, and higher than 35% in a 350 MHz band. Two-tone characterization has shown a carrier to 3rd order intermodulation ratio higher than 25 dB in the Doherty region. © 2001-2012 IEEE.
Gallego D.,Pedagogical and Technological University of Colombia
Nuclear and Particle Physics Proceedings | Year: 2015
After reviewing several mechanisms proposed to get a dS/Minkowski vacuum in moduli stabilization scenarios of type-IIB superstring orientifold compactifications we propose a criterium for characterizing those that may effectively lead to a positive small cosmological constant. We suggest that the variation in the expectation value of a good uplifting term, due to the shift in the minimum of the potential after uplifting, is much smaller than the original cosmological constant. This is studied with some detail in Large volume scenarios where the dependency on the volume direction is rather generic and easy to spot. Here we find that an uplifting term in the potential, with generic form Vup~1/Vγ, should be restricted to the one satisfying γ. ≪. 12. Such a bound might explain why in models previously studied no uplifting has been achieved, and gives motivations to study a novel proposal of dilaton dependent uplifting mechanism for which no numerical studies has been performed before. We find that in this case it is actually possible to get a dS vacuum, but still leave open the question of a more precise discrimination feature the good uplifting mechanisms should satisfy. © 2015 Elsevier B.V.
Gallego D.,Pedagogical and Technological University of Colombia
International Journal of Modern Physics A | Year: 2014
We revisit the integration of fields in N= 1 Supergravity with the requirement that the effective theory has a reliable two-derivative supersymmetric description. In particular, we study, in a supersymmetric manifest way, the situation where the fields that are mapped out have masses comparable to the Supersymmetry breaking scale and masses of the remaining fields. We find that as long as one stands in regions of the field configuration space where the analytic continuation to superspace of the F-flatness conditions be reliable equations of motion for the fields that are being mapped out, and provided their solutions are stable regardless the dynamics of the remaining fields, such a two-derivative description is a reliable truncation of the full effective theory. The study is mainly focused to models with two chiral sectors, H and L, described by a Kähler invariant function with schematic dependencies of the form G = GH(H,H¯)+GL(L,L¯), which leads to a nearly decoupled theory that allows the previous requirements to be easily satisfied in a consistent way. Interestingly, enough for the matters of our study, this kind of models present a scenario that is as safe as the one presented in sequestered models. It is also possible to allow gauge symmetries as long as these appear also factorized in hidden and visible sectors. Then, the integration of the hidden vector superfields is compulsory and proceeds reliably through the D-flatness condition analytically continued to superspace. © 2015 World Scientific Publishing Company.
Chiquillo E.,Pedagogical and Technological University of Colombia
Journal of Physics A: Mathematical and Theoretical | Year: 2015
We investigate the one-dimensional (1D) and two-dimensional (2D) reduction of a quantum field theory starting from the three-dimensional (3D) many-body Hamiltonian of interacting bosons with spin-orbit (SO) and Rabi couplings. We obtain the effective time-dependent 1D and 2D nonpolynomial Heisenberg equations for both the repulsive and attractive signs of the inter-atomic interaction. Our findings show that in the case in which the many-body state coincides with the Glauber coherent state, the 1D and 2D Heisenberg equations become 1D and 2D nonpolynomial Schrödinger equations (NPSEs). These models were derived in a mean-field approximation from 3D Gross-Pitaevskii equation (GPE), describing a Bose-Einstein condensate (BEC) with SO and Rabi couplings. In the present work self-repulsive and self-attractive localized solutions of the 1D NPSE and the 1D GPE are obtained in a numerical form. The combined action of SO and Rabi couplings produces conspicuous sidelobes on the density profile, for both signs of the interaction. In the case of the attractive nonlinearity, an essential result is the possibility of getting an unstable condensate by the increasing of SO coupling. © 2015 IOP Publishing Ltd.
Gallego D.,Pedagogical and Technological University of Colombia
Journal of High Energy Physics | Year: 2011
We study the reliability of the Two-Step moduli stabilization in the type- IIB Large Volume Scenarios with matter and gauge interactions. The general analysis is based on a family of N = 1 Supergravity models with a factorizable Kähler invariant function, where the decoupling between two sets of fields without a mass hierarchy is easily understood. For the Large Volume Scenario particular analyses are performed for explicit models, one of such developed for the first time here, finding that the simplified version, where the Dilaton and Complex structure moduli are regarded as frozen by a previous stabilization, is a reliable supersymmetric description whenever the neglected fields stand at their leading F-flatness conditions and be neutral. The terms missed by the simplified approach are either suppressed by powers of the Calabi-Yau volume, or are higher order operators in the matter fields, and then irrelevant for the moduli stabilization procedure. Although the power of the volume suppressing such corrections depends on the particular model, up to the mass level it is independent of the modular weight for the matter fields. This at least for the models studied here but we give arguments to expect the same in general. These claims are checked through numerical examples. We discuss how the factorizable models present a context where despite the lack of a hierarchy with the supersymmetry breaking scale, the effective theory still has a supersymmetric description. This can be understood from the fact that it is possible to find vanishing solution for the auxiliary components of the fields being integrated out, independently of the remaining dynamics. Our results settle down the question on the reliability of the way the Dilaton and Complex structure are treated in type-IIB compactifications with large compact manifold volumina. © SISSA 2011.
Rodriguez C.I.R.,Pedagogical and Technological University of Colombia
Work | Year: 2012
This work describes the experience of application of a procedural initiative, which aimed to identify and address technical assistance needs progressively in therapy and rehabilitation activities. The proposal theoretical axes are the basics of participatory ergonomics and interdisciplinary work, was raised with the intention of addressing important issues for the entire design process including: perception, attention, memory and human being comfort, and the interrelationships that create objects in the context in which they are used. This project was done in collaboration with leading institutes for the rehabilitation of Colombia: Cirec and Roosevelt, through two investigative stages: a first ethnographic stage, during which were observed one hundred forty four (144) procedures of rehabilitation and therapy to build a bank of assistive technology needs, justified on the project observation variables. And a second stage of action research in which they were designed elements that facilitate the implementation of rehabilitation procedures efficiently. Currently being developed experiential situations in different hospitals to examine the reliability of the proposed solutions. © 2012 - IOS Press and the authors. All rights reserved.
Huertas R.A.P.,Pedagogical and Technological University of Colombia
Revista Lasallista de Investigacion | Year: 2013
Yogurt is a functional food, a fermented dairy product obtained because of the fermentation of the acidlactic bacteria of the milk. It has been widely known through many years for its effects on human health, among which colon cancer prevention, reduction of cholesterol, improvement of the intestinal bacteria, effects on the immune system and prevention of helicobacter pylori, among others, can be highlighted. The bacteria responsible for these effects are the acid-lactic-probiotic, such as bifid bacteria, streptococcus and, mainly, lactobacillus.
Rey-Anacona C.A.,Pedagogical and Technological University of Colombia
Terapia Psicologica | Year: 2013
General and sex-differences in prevalence were examined with regard to physical, psychological, emotional, sexual, economical, and negligent dating violence behaviors, in 902 adolescents and youths Colombian single adults, 417 males and 485 women, 15-35 years years-old. 85.6% informed to have been object, at least once, of some abusive behavior. Not statistical differences by sex were found in this general prevalence. The more frequent maltreatment type was the psychological, continued by physical, emotional, sexual, economical, and negligent. Males informed more frequently some emotional, sexual, economical, and negligent abusive behavior than women. Not statistical differences by sex were found with regard to the physical and psychological abuse. © 2013 by Sociedad Chilena de Psicología Clínica.