1,820 research outputs found
Análisis de factibilidad de auto generación de energía en el sector residencial del departamento del atlántico
Maestría en IngenieríaEn este trabajo se presenta un análisis de factibilidad de sistemas de generación
distribuida con fuentes no convencionales de energía para el departamento del Atlántico. El
análisis se ha desarrollado en dos temas principales. El primer tema evalúa el potencial
energético no convencional de origen eólico y solar considerando las siguientes variables
climatológicas, temperatura radiación solar y velocidad de viento, los datos utilizados
tuvieron origen en fuentes de información (Nasa, Ideam, Weather Underground), se
compararon valores para distintas zonas y finalmente se validó un mapa climatológico.
En el segundo tema se identificaron los promedios de consumo energético residencial
de los estratos socioeconómicos 1, 2, y 3. En este análisis se logró identificar los hábitos y
tendencias de consumo por zonas y nivel socioeconómico.
Una vez identificados el potencial energético no convencional y los consumos
energéticos, se hace una revisión del alcance jurídico, técnico y financiero de la generación
distribuida en Colombia, Luego de ello, se hace una descripción de los dispositivos
tecnológicos y técnicas de instalación para aprovechamiento del potencial energético,
finalmente se presenta el análisis de factibilidad de generación distribuida para cada
municipio.This work presents a feasibility analysis of distributed generation systems with
unconventional sources of energy for the Departamento Del Atlantico, The analysis has
been developed in two main topics. The first one evaluates the unconventional energy
potential of wind and solar origin considering the following climatological variables, solar
radiation temperature and wind speed, Data used came from several sources of information
(Nasa, Ideam, Weather Underground) Comparing values for different zones and finally
validating a climatological map.
The second topic identified the residential energy consumption averages of the
socioeconomic strata 1, 2, and 3. In this analysis, were identified. Habits and consumption
trends by zones and social economic level.
Once unconventional energy potential and energy consumption have been identified, a
review of the legal, technical and financial scope of distributed generation in Colombia is
made. Thereafter, a description of the technological and technical devices for the use of the
finally, the feasibility analysis of distributed generation for each municipality is presente
From five-loop scattering amplitudes to open trees with the Loop-Tree Duality
Characterizing multiloop topologies is an important step towards developing
novel methods at high perturbative orders in quantum field theory. In this
article, we exploit the Loop-Tree Duality (LTD) formalism to analyse multiloop
topologies that appear for the first time at five loops. Explicitly, we open
the loops into connected trees and group them according to their topological
properties. Then, we identify a kernel generator, the so-called NMLT
universal topology, that allow us to describe any scattering amplitude of up to
five loops. Furthermore, we provide factorization and recursion relations that
enable us to write these multiloop topologies in terms of simpler
subtopologies, including several subsets of Feynman diagrams with an arbitrary
number of loops. Our approach takes advantage of many symmetries present in the
graphical description of the original fundamental five-loop topologies. The
results obtained in this article might shed light into a more efficient
determination of higher-order corrections to the running couplings, which are
crucial in the current and future precision physics program.Comment: 14 pages, 6 figures, 2 table
Sarcomas primarios de hueso: estudio por citometría estática mediante análisis digital de imagen
Se presenta un estudio morfométrico y densitométrico mediante análisis digital
de imagen de una serie de 50 tumores óseos malignos (32 osteosarcomas, 12 condrosarcomas
y 6 histiocitomas fibrosos malignos de hueso), con el fin de evaluar la utilidad
de la técnica para establecer el grado y el pronóstico de estas neoplasias. Las variables
morfométricas y la disposición de la cromatina guardan una estrecha relación con el grado
histológico (Spearman; p < 0,05) y muestran diferencias estadísticamente significativas
entre los tumores considerados de alto y bajo grado en base a su presentación y evolución
clínica. La ploidía estimada por densitometría óptica se comporta como un factor pronóstico
independiente en el análisis multivariante de la serie de tumores de alto grado (COX;
p < 0,001). La citometría estática, aunque más lenta e imprecisa que la citometría de flujo
en la determinación de los picos de ploidía, permite analizar el modelo de cromatina y
contribuye objetivamente al establecimiento del grado biológico de los tumores óseos.A densitometry and morphometric assessment by static image cytometry of
50 malignant bone tumors (32 osteosarcomas, 12 chondrosarcomas, and 6 malignant fibrous
histiocytomas of bone) was performed in order to assess the validity of the technic
in the pathobiological and prognostic evaluation of these neoplasms. A strong correlation
between the morphometric features, cromatine distribution and histologic grade was
found (Spearman; p < 0.05). These parameters are also statistically different for hight and
low grade tumors in clinical staging. The stimation of DNA ploidy by optic densitometry
is a significant prognostic factor in the multivariant analysis for the high grade tumors
(COX; p < 0.001). Although Flow cytometry is a better procedure to evaluate DNA ploidy
peaks, our study reveals static image cytometry as a useful technic for determine the
cromatine model and objective assessment of the biological grade of bone neoplasms
Spatiotemporal changes in aerosol properties by hygroscopic growth and impacts on radiative forcing and heating rates during DISCOVER-AQ 2011
This research has been supported by the H2020 Marie Sklodowska-Curie Actions (grant no. 778349), the Spanish Ministry of Economy and Competitiveness (RTI2018101154.A.I00), and by the Russian Science Foundation (project 2117-00114, entitled Development of lidar retrieval algorithms).This work focuses on the characterization of vertically resolved aerosol hygroscopicity properties and their direct radiative effects through a unique combination of ground-based and airborne remote sensing measurements during the Column and Vertically Resolved Observations Relevant to Air Quality (DISCOVER-AQ) 2011 field campaign in the Baltimore-Washington DC metropolitan area. To that end, we combined aerosol measurements from a multiwavelength Raman lidar located at NASA Goddard Space Flight Center and the airborne NASA Langley High Spectral Resolution Lidar-1 (HSRL-1) lidar system. In situ measurements aboard the P-3B airplane and ground-based Aerosol Robotic Network - Distributed Regional Aerosol Gridded Observational Network (AERONET-DRAGON) served to validate and complement quantifications of aerosol hygroscopicity from lidar measurements and also to extend the study both temporally and spatially. The focus here is on 22 and 29 July 2011, which were very humid days and characterized by a stable atmosphere and increasing relative humidity with height in the planetary boundary layer (PBL). Combined lidar and radiosonde (temperature and water vapor mixing ratio) measurements allowed the retrieval of the Hanel hygroscopic growth factor which agreed with that obtained from airborne in situ measurements and also explained the significant increase of extinction and backscattering with height. Airborne measurements also confirmed aerosol hygroscopicity throughout the entire day in the PBL and identified sulfates and water-soluble organic carbon as the main species of aerosol particles. The combined Raman and HSRL-1 measurements permitted the inversion for aerosol microphysical properties revealing an increase of particle radius with altitude consistent with hygroscopic growth. Aerosol hygroscopicity pattern served as a possible explanation of aerosol optical depth increases during the day, particularly for fine-mode particles. Lidar measurements were used as input to the libRadtran radiative transfer code to obtain vertically resolved aerosol radiative effects and heating rates under dry and humid conditions, and the results reveal that aerosol hygroscopicity is responsible for larger cooling effects in the shortwave range (7-10 W m(-2) depending on aerosol load) near the ground, while heating rates produced a warming of 0.12 K d(-1) near the top of PBL where aerosol hygroscopic growth was highest.H2020 Marie Sklodowska-Curie Actions 778349Spanish Ministry of Economy and Competitiveness RTI2018101154.A.I00Russian Science Foundation (RSF) 2117-0011
Modularization in Belief-Desire-Intention agent programming and artifact-based environments
This article proposes an extension for the Agents and Artifacts meta-model to enable modularization. We adopt the Belief-Desire-Intention (BDI) model of agency to represent independent and reusable units of code by means of modules. The key idea behind our proposal is to take advantage of the syntactic notion of namespace, i.e., a unique symbol identifier to organize a set of programming elements. On this basis, agents can decide in BDI terms which beliefs, goals, events, percepts and actions will be independently handled by a particular module. The practical feasibility of this approach is demonstrated by developing an auction scenario, where source code enhances scores of coupling, cohesion and complexity metrics, when compared against a non-modular version of the scenario. Our solution allows to address the name-collision issue, provides a use interface for modules that follows the information hiding principle, and promotes software engineering principles related to modularization such as reusability, extensibility and maintainability. Differently from others, our solution allows to encapsulate environment components into modules as it remains independent from a particular BDI agent-oriented programming language
Evaluación del comportamiento a macro-fisuración por fatiga de mezclas bituminosas modificadas con polvo de neumático
The use of crumb rubber modified bitumen (CRMB) in asphalt mixes is a road engineering technology
that has become increasingly important in recent years. Given the many economic and environmental
benefits of this type of binder, the goal is to give CRMB the same level of performance as conventional polymermodified
bitumen. The appearance and propagation of cracks due to fatigue phenomena is one of the most
common distresses affecting road pavements. Since crumb rubber enhances the mechanical properties of asphalt
mixes, it can provide a viable solution for fatigue cracking. This paper presents the results of a comparative
analysis of the fatigue-cracking behavior of asphalt mixtures manufactured with crumb rubber modified bitumen
and polymer-modified bitumen.El empleo de betunes modificados con polvo de neumático usado en la fabricación
de mezclas bituminosas es una de las técnicas que mayor auge está teniendo en los últimos años en la
ingeniería de carreteras. Dadas sus grandes ventajas económicas y ambientales, este tipo de ligantes pretende
conseguir prestaciones similares a la de los betunes modificados con polímeros utilizados habitualmente.
La aparición de fisuras debido a fenómenos de fatiga es una de las patologías más comunes en firmes de
carretera. Debido a las mejoras de las propiedades mecánicas del betún aportadas tras la incorporación
de polvo de neumático, las mezclas fabricadas con estos ligantes se postulan como una posible solución a
dicho problema. En este artículo se lleva a cabo un análisis comparativo del comportamiento a fisuración
por fatiga realizado sobre mezclas bituminosas fabricadas con betún modificado con polvo de neumático y
con polímeros.This research was carried out within the framework
of the R + D + i project entitled Proyecto Integrado
de Investigación, Desarrollo y Demostración de
Tecnologías para la aplicación de neumáticos fuera
de uso en firmes de carretera resistentes a la propagación
de grietas (ref. IDI-20091076), funded by the
Center for Industrial Technological Development
(CDTI) of the Ministry of Science and Innovation
in Spain
Prevalence of Mycobacterium avium subsp. paratuberculosis infection in sheep flocks from three regions of Antioquia, Colombia
Paratuberculosis or Johne’s disease is a slow-developing infectious disease caused by Mycobacterium avium subsp. paratuberculosis (MAP) affecting mainly domestic ruminants and producing a significant economic threat to livestock production systems. Although reports on paratuberculosis in small ruminants in Colombia are very scarce, the Colombian sheep industry has identified paratuberculosis as one of the causes of its low development. There have been reports of MAP infection in sheep flocks, mainly in the Cundiboyacense Plateau and the Bogotá savannah, but the prevalence of MAP infection in sheep and goat populations in Colombia is yet unknown. Therefore, the present study aimed to accurately estimate the prevalence of MAP infection at flock level in a sheep population of 24 flocks located in three regions of the province of Antioquia, Colombia. ELISA test as well as culture and direct qPCR were used as diagnostic tools. Overall, 456 blood serum samples were analysed and at least one seropositive animal was found in 17 (70% IC: 51.2-0.90) out of the 24 study flocks and, in total, 37 animals showed positive ELISA results (8% IC: 5.5-10.5). Regarding MAP direct detection, 90 faecal pools from the 24 flocks were cultured and subjected to qPCR diagnosis. Both direct qPCR and culture detected 25 (27.7%) and 64 (71.1%) faecal pools as MAP positive, respectively. More specifically, MAP positive pools were detected in 45.8% (IC: 24.3-67.3) and 83.3% (IC: 67.3-99.3) of the flocks by direct qPCR and culture, respectively. MAP infection is widespread in sheep flocks in the study regions and the combination of several diagnostic tests was necessary to achieve a more accurate and precise infection detection of this important pathogen
Effect of Grazing Management on Herbage Accumulation of Lucerne-Orchard Grass Sward
Throughout most of México, lucerne (Medicago sativa) is the primary forage legume used in the dairy industry. Unfortunately, lucerne does not grow in late autumn and winter due to adverse weather. Recent studies with lucerne have suggested that the inclusion of a companion grass will invariably increase the seasonal distribution and total annual yield of swards (Laidlaw & Teuber, 2001). However the management of mixed swards containing lucerne is difficult as a grazing frequency or intensity which suits one species may be detrimental to the other. Changes in balance between grass and legume, especially in grazed swards, have been observed. In México mixtures of lucerne-orchard grass have a good persistence and productivity. However the explanation for this is unclear. This study examined the effects of different grazing management practices on lucerne-orchard grass production and seasonal distribution
The decay in the presence of a constant antisymmetric tensor field
A constant antisymmetric 2-tensor can arise in general relativity with
spontaneous symmetry breaking or in field theories formulated in a
noncommutative space-time. In this work, the one-loop contribution of a
nonstandard vertex on the flavor violating quark transition is studied in the context of the electroweak Yang-Mills sector
extended with a Lorentz-violating constant 2-tensor. An exact analytical
expression for the on shell case is presented. It is found that the loop
amplitude is gauge independent, electromagnetic gauge invariant, and free of
ultraviolet divergences. The dipolar contribution to the
transition together with the experimental data on the decay is
used to derive the constraint TeV on the Lorentz-violating
scale.Comment: 14 pages and 2 figure
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