786 research outputs found
Integration of the territorial approach in the management of natural capital: a proposal for a taxonomic systematization in territories of Andalusia
Premio extraordinario de Trabajo Fin de Máster curso 2022/2023. Máster en Estrategias para el Desarrollo Rural y Territorial
Estado físico-químico del suelo en pasturas con y sin maní forrajero (Arachis pintoi), URACCAN-Siuna
The study was developed in an area of one block, owned by Mr. Marvin Calderón, located in Yaoya Community, municipality of Siuna. The objective was to compare the physical-chemical state of the soil in pastures with and without fodder peanut (Arachis pintoi). It is quasi-experimental pre-test, post-test, longitudinal and descriptive study and the observational technique was used. It is concluded that the Arachis pintoi is a species that contributes to the improvement of the soil quality and it is recommended the use of agronomic practices before and after establishing the same. The establishment of Arachis pintoi and the grass plot without it cost C 7,377.00 in total.El estudio fue desarrollado en un área de una manzana, propiedad del señor Marvin Calderón, localizada en la comunidad Yaoya, municipio de Siuna. El objetivo fue comparar el estado físico–químico del suelo en pasturas con y sin maní forrajero (Arachis pintoi). Es cuasi experimental pre test, post test, longitudinal y descriptivo y se utilizó la técnica observacional. Se concluye, que el Arachis pintoi es una especie que contribuye al mejoramiento de la calidad del suelo y se recomienda el uso de prácticas agronómicas antes y después de establecer el mismo. El establecimiento del Arachis pintoi y la parcela de pasto sin este, cuestan en total C 7,377. 00
Monitoring and preliminary analysis of the natural responses recorded in a poorly accessible streambed spring located at a fluviokarstic gorge in Southern Spain
The analysis of natural responses (hydrodynamic, hydrothermal and hydrochemical) of karst springs is a well-established approach to provide insights into the hydrogeological functioning of the aquifers that they drain. However, a suitable monitoring program of these responses are often difficult to launch in poorly accessible streambed springs, due to the mixing between surface water and groundwater, in addition to topographic impediments. This work describes the installation procedure of the measurement equipment and the preliminary hydrogeological dataset collected at the Charco del Moro spring (Southern Spain) during one year. This outlet emerges 5 m below water surface, at the bottom of a partially flooded 20 - 200 m deep and 2 km long gorge, eroded by the Guadiaro River streamflow. It is considered the largest discharge point in the region, draining groundwater from northern nearby carbonate outcrops, although its catchment area is not established yet. Continuous (hourly) monitoring of electrical conductivity, water temperature, turbidity and water level (discharge) reflects a high degree of heterogeneity in the duality of groundwater flow and storage dynamics, which is typical of karst conduit flow systemsUniversidad de Málaga. Campus de Excelencia Internacional Andalucía Tec
Assessment of aerial thermography as a method of in situ measurement of radiant heat transfer in urban public spaces
Una propuesta de nuevas estrategias para la mejora del medio ambiente urbano, usando termografía aérea para el cálculo de la temperatura media radianteUrban public spaces are an essential part of the urban environment, supporting social relationships and pro- moting a healthy lifestyle among citizens. However, the high value of urban land has led to an over-urbanisation of cities, increasing urban heat stress and decreasing the number and size of public spaces. Rising air temper- atures in cities – known as the urban heat island effect (UHI) - combined with global warming, make public spaces less comfortable. For these reasons, there has been a growing concern to improve the thermal comfort of urban spaces. Thermal radiation is a determining factor in urban thermal comfort and is normally summarised in a value called mean radiant temperature (TMRT). In the past, conventional methods have been used to calculate it, such as net radiometers and globe thermometers. In recent years, the scientific community has used ground- based handheld thermal cameras for its quantification. However, there is a lack of literature on the use of aerial thermography for this purpose (i.e. an unmanned aerial vehicle (UAV) equipped with a thermal infrared device). Given this gap in the literature and the advantages in time, versatility and accuracy of these systems, this paper presents a new method for assessing the measurement of radiant heat transfer in a pedestrian urban space using aerial thermography. From the surface temperatures of the infrared imagery collected by the UAV, TMRT was estimated at multiple points in a pedestrian area of a subtropical city (Huelva, Spain) during a typical summer day. In order to verify accuracy of the proposed method to estimate the TMRT, a microclimate urban simulation was carried out using ENVI-met v5. The comparative analysis of the measured and simulated dataset verified the applicability of aerial thermography for the measurement of radiant heat transfer (with R2 values of 0.98 for the data set and 0.8 for the data of each time period). To conclude, new strategies were proposed to improve urban thermal comfort and to make cities more sustainable.Funding for open access charge: Universidad de Huelva/CBUA.
Proyecto SALTES (P20_00730): Smartgrid with reconfigurable Architecture for testing controL Techniques and Energy Storage priority. Programa Operativo FEDER 2014-2020 Junta de Andalucia
Combined use of the GGSFT data base and on Board Marine Collected Data to Model the Moho Beneath the Powell Basin, Antarctica
The Powell Basin is a small oceanic basin located at the NE end of the Antarctic Peninsula developed during the Early Miocene and mostly surrounded by the continental crusts of the South Orkney Microcontinent, South Scotia Ridge and Antarctic Peninsula margins. Gravity data from the SCAN 97 cruise obtained with the R/V Hespérides and data from the Global Gravity Grid and Sea Floor Topography (GGSFT) database (Sandwell and Smith, 1997) are used to determine the 3D geometry of the crustal-mantle interface (CMI) by numerical inversion methods. Water layer contribution and sedimentary effects were eliminated from the Free Air anomaly to obtain the total anomaly. Sedimentary effects were obtained from the analysis of existing and new SCAN 97 multichannel seismic profiles (MCS). The regional anomaly was obtained after spectral and filtering processes. The smooth 3D geometry of the crustal mantle interface obtained after inversion of the regional anomaly shows an increase in the thickness of the crust towards the continental margins and a NW-SE oriented axis of symmetry coinciding with the position of an older oceanic spreading axis. This interface shows a moderate uplift towards the western part and depicts two main uplifts to the northern and eastern sectors
Identificación y evolución de los grupos estratégicos de la industria bancaria venezolana
Este documento se centra en la identificación y evolución de los grupos estratégicos (GE) del sector bancario de Venezuela durante el periodo 2008-2010. El test M de Box demostró que hubo inestabilidad financiera durante este lapso de tiempo, por ello se evaluó el comportamiento de los GE en cada año de estudio. Otros resultados habían indicado que 1) al aplicar un procedimiento estadístico es posible detectar gradaciones en la implementación o evasión de las estrategias, o del compromiso de recursos por parte de los GE, y 2) el empleo del procedimiento estadístico llevó a coincidir con estudios previos en que ninguno de los GE estudiados correspondió de manera exclusiva a las grandes categorías del negocio bancario: corporativo, minorista, de inversión, entre otras, sino que desarrollaron estrategias híbridas, pero bien diferenciadas según las variables utilizadas. Este comportamiento híbrido fue demostrado inequívocamente con las pruebas post hoc aplicadas; para competir los GE ejecutan un conjunto de estrategias y no una sola. Esta investigación sugiere que en momentos de inestabilidad financiera los bancos cambian de estrategia y por tanto de GE, con el fin de obtener un buen desempeño, o al menos sobrevivir. Estos resultados permitirán a gerentes de los bancos conocer en qué GE están participando, saber cuáles son sus rivales más inmediatos y qué estrategias llevan a cabo los bancos que integran los demás GE, además de cómo evolucionan los GE en entornos inestable
Design recommendations for the rehabilitation of an urban canyon in a subtropical climate region using aerial thermography and simulation tools
Outdoor public space is the setting for everyday social interaction where activities take place in order to satisfy collective urban needs. It is important to achieve climate-friendly urban design in order to ensure acceptable urban thermal comfort, especially in over-urbanised city centres during summer periods. In this research, an urban canyon street located in the historical centre of the subtropical city of Huelva (Spain) was analysed. After a survey carried out by in situ meteorological sensors and airborne infrared sensors (equipped on an unmanned aerial vehicle, UAV), the current thermal comfort was analysed in terms of PMV and PPD at different times of a typical summer day (11:00 h, 15:00 h and 19:00 h) with the aim of formulating design recommendations to improve its performance in terms of urban comfort. Then, thermal comfort was evaluated in different scenarios where feasible mitigation strategies (replacement of materiality, addition of vegetation and sun shading ele- ments) were applied to classify them according to their effectiveness using the ENVI-met simulation tool. The results of the current scenario showed that, due to its N-S orientation and its aspect ratio (H/W), the urban comfort depends drastically on the day hour variation. A comfortable thermal environment is achieved at all points of the urban canyon as a result of the shade generated by the buildings during the morning and afternoon. However, in the central hours of the day the feeling of thermal discomfort was alarming (PMV values of +3 and PPD values above 90%). The proposed mitigation measures showed a considerable improvement in urban thermal comfort, with the addition of vegetation being the most effective solution (with an improvement in PMV value of 42% and a reduction in PPD value of 43%). The combination of all the proposed measures in a single scenario showed encouraging results in the rehabilitation of public spaces in use.This work has been funded by the Research Center for Technology, Energy and Sustainability (CITES) at the University of Huelva.
This work has been also funded by Proyecto SALTES (P20_00730): Smartgrid with reconfigurable Architecture for testing controL Techniques and Energy Storage priority. Programa Operativo FEDER 2014- 2020 Junta de Andalucia.
Funding for open access charge: Universidad de Huelva/CBUA
Adiestramiento de carneros para la colección de semen con vagina artificial
Con el objetivo de establecer y validar un protocolo de entrenamiento de carneros para la recolección de semen con vagina artificial, montando una hembra sin necesidad que este en celo, se utilizaron ocho carneros con edades entre 1 y 3 años. Hubo dos etapas de preparación cada una de dos semanas y dos sesiones de entrenamiento por semana. Cada sesión tuvo una duración de 10 minutos o la obtención de tres eyaculados, lo que primero sucediera. En la primera etapa, se colocaron los carneros individualmente ante una hembra en celo, con el fin de lograr un preámbulo sexualnatural. En la segunda etapa, se usó como estímulo una borrega que no estaba en celo para entrenar a los carneros, con el fin de lograr un condicionamiento operante. Se utilizó una vagina artificial, con una caperuza externa (20 × 5,5 cm) de goma, y un conducto interno de látex. La vagina se llenó con 50 ml de agua a 45-50 ºC para llegar a 38 ºC en el momento de recolectar el semen. Luego se agregó aire a la vagina con el fin de estrechar la luz vaginal a 1 cm de diámetro. No se usó lubricante en el momento de la colección. Al inicio de cada etapa, el 25% de los carneros no eyacularon; sin embargo, al final de las fases, todos eyacularon al menos dos veces. Se concluye que, mediante el protocolo de entrenamiento utilizado, el 100% de los carneros, en este estudio, fueron entrenados para colectar semen con vaginaartificial sin necesidad de que la hembra se encuentre en celo
Gestión e integración de datos altimétricos y batimétricos en la costa andaluza: uso del “model builder”
En esta comunicación se presenta la estrategia adoptada en la incorporación de la información altimétrica y
batimétrica de la costa andaluza al Subsistema del Litoral y Medio Marino (SSLyMM), realizado para la
Consejería de Medio Ambiente. En primer lugar se opto por modificar el objetivo final: no se trata de generar
un único MDE continuo, sino de mantener los datos altimétricos y batimétricos permanentemente actualizados
en un base de datos espacial y diseñar una herramienta interactiva que produzca los MDEs a demanda en
función de las aplicaciones en las que se usará. Para ello, se diseño una herramienta utilizando la aplicación
ModelBuilder de ArcGis 9.3 que encadena varios procesos de análisis espacial a partir de la información
original almacenada en la base de datos (curvas, cotas, sondas o datos raster). Estos procesos se concretan
en algoritmos que primero interpolan la batimetría y posteriormente ajustan el datum del MDE resultante al
datum altimétrico (mareógrafo Alicante). En segundo lugar se interpola la altimetría y se ajusta a la línea de
costa del SSLyMM y, en tercer lugar, se extrae el 0 hidrográfico ya ajustado al 0 de Alicante y se interpola la
zona intermareal con los datos existentes desde dicho cero hasta la línea de costa. La posibilidad de
configurar variables y parámetros que se deciden interactivamente por el usuario antes de ejecutar la
herramienta permite definir el área de análisis y la resolución espacial del modelo resultante, el algoritmo de
interpolación a utilizar y la paleta de color a aplicar al MDE resultante entre otras opciones. Por otra parte, esta
estrategia permite incorporar de forma inmediata la nueva información disponible (muy variable en el medio
submarino) y ajustar las características del MDE (resolución espacial, interpolador, etc.) resultante a las
demandas de la aplicación temática para la que va a utilizar (modelado de oleaje, navegación marítima,
evaluación de riesgos, generación sombreados para fondos cartográficos, etc.).This paper presents the methodology used for the integration of the altimetric and bathymetric data of the
andalusiam coast into the Littoral and Marine Environment Subsystem (SSLyMM), made for the Environmental
Regional Ministry. The aim of this work was not the generation of a only continuous digital elevation model
(DEM), as it was firstly required, but also the design of a strategy for keeping the altimetric and bathymetric data always updated in a geodatabase and the development of an interactive tool to produce different DEMs
depending on the requirements of the potential user. The tool was designed using the application
ModelBuilder in ArcGis 9.3 that uses different spatial analysis processes applied to the original data stored in
the spatial database. Those processes reflects a set of algorithms that firstly interpolated the bathymetry data
and then adjust the resulting DEM to the national altimetric datum, located in the Mean Sea Level at the
Alicante tide gauge in Spain (NMMA). The second step was the interpolation of the altimetry data and the
adjustment of the shoreline contained in the SSLyMM. The third step was the extraction of the corrected
hydrographic zero contour (once referred to the NMMA) and the interpolation of the intertidal area elevation by
means of the available data of this area. The area of the DEM, its spatial resolution, the algorithm that would
be used for spatial interpolation and other variables and parameters can be chosen by the user before
executing the tool. This strategy let the incorporation of potential new information available (what is quite usual
on bathymetry due to the scarcity of data), and the adjustment of the DEM characteristic (spatial resolution,
interpolation methods...) to the requirements of the use and applications that the DEM might have
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