9,283 research outputs found
Clasificación geomorfométrica a partir de datos lidiar en un área minera degradada
Las caracterÃsticas del cualquier entorno varÃan considerablemente en función de la topografÃa, siendo un
factor indispensable a tener en cuenta en cualquier estudio, y más concretamente en la Sierra Minera de
Cartagena – La Unión; zona de clima semiárido en la que históricamente ha tenido lugar una gran actividad
de minerÃa extractiva que ha modificado todos sus componentes morfológicos (relieve, pendiente, etc.),
resultando por tanto de especial interés la clasificación de los elementos geomorfológicos allà presentes.
En este estudio se ha utilizado un Modelo Digital de Elevaciones (MDE) de 4 metros de resolución espacial
obtenido a partir de un vuelo LiDAR (Light Detection and Ranging) con el objetivo de hacer una clasificación
geomorfométrica. Para ello, se realiza una primera aproximación a la realidad de la zona de estudio mediante
una clasificación no supervisada, utilizando como técnica cluster el algoritmo ISODATA (Iterative Self-
Organizing Data Analysis Technique), e introduciendo los atributos topográficos derivados directamente del
MDE para caracterizar las clases. Asimismo, se realiza una clasificación supervisada basada en áreas de
entrenamiento de los principales elementos geomorfológicos.The characteristics of any environment vary widely in relation with the topography, being an indispensable
factor to take into account in any study, and more specifically in the mining range of Cartagena - La Unión. It is
a semiarid area in which, historically, large mining activity has changed all its morphological components
(relief, slope, etc..), being of special interest the classification of its geomorphological elements.
The data used in the classifications were derived from a four-meter grid LIDAR- DEM. Firstly, we perform an
approximation to the reality of the study area by unsupervised classification, using the ISODATA (Iterative Self-
Organizing Data Analysis Technique) algorithm cluster technique, introducing the topographic attributes
derived directly from the DEM to characterize classes. Also a supervised classification based on training areas
of the main geomorphological elements is performed
The application of terrestrial laser scanner and SfM photogrammetry in measuring erosion and deposition processes in two opposite slopes in a humid Badlands area (Central Spanish Pyrenees)
Erosion and deposition processes in badland areas are usually estimated using traditional observations of topographic changes, measured by erosion pins or profile metres (invasive techniques). In recent times, remote-sensing techniques (non-invasive) have been routinely applied in geomorphology studies, especially in erosion studies. These techniques provide the opportunity to build high-resolution topographic models at centimetre accuracy. By comparing different 3-D point clouds of the same area, obtained at different time intervals, the variations in the terrain and temporal dynamics can be analysed. The aim of this study is to assess and compare the functioning of terrestrial laser scanner (TLS, RIEGL LPM-321) and structure-from-motion photogrammetry (SfM) techniques (Camera FUJIFILM, Finepix x100 and software PhotoScan by AgiSoft) to evaluate erosion and deposition processes in two opposite slopes in a humid badlands area in the central Spanish Pyrenees. Results showed that TLS data sets and SfM photogrammetry techniques provide new opportunities in geomorphological erosion studies. The data we recorded over 1 year demonstrated that north-facing slopes experienced more intense and faster changing geomorphological dynamics than south-facing slopes as well as the highest erosion rates. Different seasonal processes were observed, with the highest topographic differences observed during winter periods and the high-intensity rainfalls in summer. While TLS provided the highest accuracy models, SfM photogrammetry was still a faster methodology in the field and precise at short distances. Both techniques present advantages and disadvantages, and do not require direct contact with the soil and thus prevent the usual surface disturbance of traditional and invasive methods
Looking At the Past and Heading to the Future: Meeting Summary of the 6(th) European Workshop on Plant Chromatin 2019 in Cologne, Germany
Effects of the inclusion of oat hulls or sugar beet pulp in the diet on gizzard characteristics, apparent ileal digestibility of nutrients, and microbial count in the ceca in 36 day old broilers reared on floor
The effects of the inclusion of oat hulls (OH) and sugar beet pulp (SBP) in the diet on gizzard characteristics, apparent ileal nutrient digestibility (AID), and Clostridium perfringens, Enterobacteriaceae, and Lactobacillus proliferation in the ceca were studied in 36 d?old broilers. There were a control diet with a low CF content (1.61%) and 2 additional diets that resulted from the dilution of this feed with 5% of either OH or SBP
Análisis de la organización funcional en el fútbol
De manera tradicional, el estudio de la estrategia motriz (táctica) en el fútbol se ha venido realizando tomando como referencia de partida, la distribución espacial de los jugadores al inicio de cada parte de los encuentros y las denominadas "jugadas estratégicas" o "jugadas a balón parado". Este trabajo es una investigación sobre la estrategia motriz en el fútbol, la cual tiene como referente teórico a la PraxiologÃa motriz. Sus objetivos son el estudio de la estrategia motriz (táctica), especÃficamente la organización funcional: usos de los subroles estratégico motores, de los equipos, en tanto que interacción motriz; considerando también las acciones con balón y su gestió
In Silico Design and Selection of New Tetrahydroisoquinoline-Based CD44 Antagonist Candidates
CD44 promotes metastasis, chemoresistance, and stemness in different types of cancer and is a target for the development of new anti-cancer therapies. All CD44 isoforms share a common N-terminal domain that binds to hyaluronic acid (HA). Herein, we used a computational approach to design new potential CD44 antagonists and evaluate their target-binding ability. By analyzing 30 crystal structures of the HA-binding domain (CD44HAbd), we characterized a subdomain that binds to 1,2,3,4-tetrahydroisoquinoline (THQ)-containing compounds and is adjacent to residues essential for HA interaction. By computational combinatorial chemistry (CCC), we designed 168,190 molecules and compared their conformers to a pharmacophore containing the key features of the crystallographic THQ binding mode. Approximately 0.01% of the compounds matched the pharmacophore and were analyzed by computational docking and molecular dynamics (MD). We identified two compounds, Can125 and Can159, that bound to human CD44HAbd (hCD44HAbd) in explicit-solvent MD simulations and therefore may elicit CD44 blockage. These compounds can be easily synthesized by multicomponent reactions for activity testing and their binding mode, reported here, could be helpful in the design of more potent CD44 antagonists
Alkaline and Alkaline-Earth Ceramic Oxides for CO2 Capture, Separation and Subsequent Catalytic Chemical Conversion
Pressure-Induced Phase-Transition Sequence In Cof 2 : An Experimental And First-Principles Study On The Crystal, Vibrational, And Electronic Properties
We report a complete structural study of CoF2 under pressure. Its crystal structure and vibrational and electronic properties have been studied both theoretically and experimentally using first-principles density functional theory (DFT) methods, x-ray diffraction, x-ray absorption at Co K-edge experiments, Raman spectroscopy, and optical absorption in the 0–80 GPa range. We have determined the structural phase-transition sequence in CoF2 and corresponding transition pressures. The results are similar to other transition-metal difluorides such as FeF2 but different to ZnF2 and MgF2, despite that the Co2+ size (ionic radius) is similar to Zn2+ and Mg2+. We found that the complete phase-transition sequence is tetragonal rutile (P42/mnm) → CaCl2 type (orthorhombic Pnnm) → distorted PdF2 (orthorhombic Pbca)+PdF2 (cubic Pa3¯) in coexistence → fluorite (cubic Fm3¯m) → cotunnite (orthorhombic Pnma). It was observed that the structural phase transition to the fluorite at 15 GPa involves a drastic change of coordination from sixfold octahedral to eightfold cubic with important modifications in the vibrational and electronic properties. We show that the stabilization of this high-pressure cubic phase is possible under nonhydrostatic conditions since ideal hydrostaticity would stabilize the distorted-fluorite structure (tetragonal I4/mmm) instead. Although the first rutile → CaCl2-type second-order phase transition is subtle by Raman spectroscopy, it was possible to define it through the broadening of the Eg Raman mode which is split in the CaCl2-type phase. First-principles DFT calculations are in fair agreement with the experimental Raman mode frequencies, thus providing an accurate description for all vibrational modes and elastic properties of CoF2 as a function of pressure
Análisis del funcionamiento de una red colectiva ante distintas estrategias de riego en parcela
En zonas colectivas de riego, la tarifa a pagar por los agricultores está muy
condicionada con el gasto energético de los equipos de bombeo, relacionada a su vez con la
cantidad de agua aplicada a los cultivos. Asà pues, es necesario el desarrollo de
herramientas de ayuda a la toma de decisiones que busquen mejorar la eficiencia en el uso
del agua y la energÃa, sin comprometer el rendimiento y productividad de los cultivos. El
objetivo del trabajo es analizar el consumo energético en una estación de bombeo de una
red colectiva de riego a la demanda ante distintos escenarios de riego en parcela y de
presiones en la cabecera. La metodologÃa propuesta ha sido aplicada a la zona regable de
Tarazona de La Mancha (Albacete, España). Se han establecidos dos manejos de riego en
parcela (con y sin déficit) para los principales cultivos de la zona y diferentes estrategias de
presiones en la cabecera (variable y fija), para analizar el efecto sobre la eficiencia y
consumo energético del bombeo. Para ello, se ha utilizado una herramienta de simulación
desarrollada en MATLAB®, en combinación con el motor de cálculo EPANET®, y se ha
aplicado como ejemplo a un dÃa de elevada demanda de agua en la red. Los resultados
indican que la utilización de presión en cabecera variable y manejo deficitario, genera
ahorros energéticos de 12,43% en relación al mismo manejo con presión fija
Relativistic quantum mechanics of a Dirac oscillator
The Dirac oscillator is an exactly soluble model recently introduced in the
context of many particle models in relativistic quantum mechanics. The model
has been also considered as an interaction term for modelling quark confinement
in quantum chromodynamics. These considerations should be enough for
demonstrating that the Dirac oscillator can be an excellent example in
relativistic quantum mechanics. In this paper we offer a solution to the
problem and discuss some of its properties. We also discuss a physical picture
for the Dirac oscillator's non-standard interaction, showing how it arises on
describing the behaviour of a neutral particle carrying an anomalous magnetic
moment and moving inside an uniformly charged sphere.Comment: 19 pages, 1 figur
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