Search results for "lcsh:T"
showing 10 items of 2832 documents
Application of EMI and FDR Sensors to Assess the Fraction of Transpirable Soil Water over an Olive Grove
2018
Accurate soil water status measurements across spatial and temporal scales are still a challenging task, specifically at intermediate spatial (0.1–10 ha) and temporal (minutes to days) scales. Consequently, a gap in knowledge limits our understanding of the reliability of the spatial measurements and its practical applicability in agricultural water management. This paper compares the cumulative EM38 (Geonics Ltd., Mississauga, ON, Canada) response collected by placing the sensor above ground with the corresponding soil water content obtained by integrating the values measured with an FDR (frequency domain reflectometry) sensor. In two field areas, characterized by different soil clay conte…
Urban Water Pricing and Private Interests’ Lobbying in Small Rural Communities
2020
This research received funding from the LIFE programme of the European Commision [project LIFE16 ENV/ES/000196], the Regional Government of Andalusia and the European Regional Development Fund (projects P18-RT-576 and B-SEJ-018-UGR18) and the University of Granada (Plan Propio. Unidad Cientifica de Excelencia: Desigualdad, Derechos Humanos y Sostenibilidad -DEHUSO-).
Turbulence in River and Maritime Hydraulics
2018
Understanding of the role of turbulence in controlling transport processes is of paramount importance for the preservation and protection of aquatic ecosystems, the minimisation of deleterious consequences of anthropogenic activity, and the successful sustainable development of river and maritime areas. In this context, the present Special Issue collects 15 papers which provide a representation of the present understanding of turbulent processes and their effects in river and maritime environments. The presented collection of papers is not exhaustive but it allows for highlighting key priority areas and knowledge gaps in this field of research.
Artificial Neural Networks for Predicting the Water Retention Curve of Sicilian Agricultural Soils
2018
Modeling soil-water regime and solute transport in the vadose zone is strategic for estimating agricultural productivity and optimizing irrigation water management. Direct measurements of soil hydraulic properties, i.e., the water retention curve and the hydraulic conductivity function, are often expensive and time-consuming, and represent a major obstacle to the application of simulation models. As a result, there is a great interest in developing pedotransfer functions (PTFs) that predict the soil hydraulic properties from more easily measured and/or routinely surveyed soil data, such as particle size distribution, bulk density (&rho
Environmental Benefits and Economical Sustainability of Urban Wastewater Reuse for Irrigation—A Cost-Benefit Analysis of an Existing Reuse Project in…
2020
Besides benefits associated to increased water availability for irrigation, reuse projects of urban water can also provide positive environmental impacts, as they contribute to improve water quality of the receiving bodies by diverting wastewater from their outlet. This represents a typical win-win situation where significant synergies can be achieved between urban and agricultural sector, and the environment. These favorable conditions, however, do not necessarily imply that water reuse is either feasible from an economic perspective nor that the underlying supply chain is going to be triggered, if certain conditions are not met. Cost-Benefit Analysis (CBA) is considered a sound, theoretic…
Enhancing a Transition to a Circular Economy in the Water Sector: The EU Project WIDER UPTAKE
2021
A novel approach for resource recovery includes forward osmosis (FO) as a concentration step in municipal wastewater treatment. The current study investigates different pre-treatment strategies including biological treatment with a moving-bed bioreactor (MBBR) at different loading rates and particle removal by filtration and sedimentation. Membrane performance and recovery potential for energy and nutrients were investigated in laboratory-scale FO experiments in batch mode using pre-treated municipal wastewater as feed and 35 g/L NaCl as a draw solution. Initial water fluxes were in the range of 6.3 to 8.0 L/(m2·h). The baseline fluxes were modelled to account for flux decline due to concen…
Evaluating Safety Systems for Machine Tools with Computer Numerical Control using Analytic Hierarchy Process
2019
Computer numerical control (CNC) machine tools are complex production systems with fully automatic machine parts. Nowadays, high feed rates and machining speeds are used during the machining process. Human operators are still needed to set-up the machine, load/unload workpieces and parts, load the machining code, and supervise the machining process. The operators work in an environment where automated high-speed motions occur, and consequently, CNC machine tools have to be equipped with safety systems. The approach presented in this paper was to evaluate the main safety systems of CNC machine tools based upon the analytic hierarchy process (AHP). The analyzed systems were divided into six m…
La formación docente en línea: experiencias con MOOCs en Sonora (México)
2019
espanolEl proposito de este estudio fue conocer las perspectivas que un grupo de profesores del estado de Sonora (Mexico) tienen sobre la formacion en linea y sobre los cursos en linea masivos y abiertos (MOOCs, por sus siglas en ingles) “Coleccion de Aprendizajes Clave”. Estos MOOCs fueron disenados para dar a conocer a los profesores de educacion basica los planteamientos del nuevo modelo educativo derivado de la reforma de 2013. El enfoque aplicado en la investigacion fue el cualitativo; los datos se colectaron por medio de entrevistas semiestructuradas a seis profesoras de primaria. Las perspectivas de las profesoras en cuanto a la formacion en linea se concentraron en las categorias de…
Los procesos de revisión textual en entornos virtuales de aprendizaje. Evaluar para aprender en la universidad
2020
Este trabajo presenta los resultados de una investigacion vinculada al desarrollo de competencias en evaluacion de la expresion escrita —revision y reescritura— en colaboracion y en linea. En ella han participado 167 estudiantes matriculados durante 2018-2019 en primer y cuarto curso de los titulos de grado de Maestro/a en Educacion Primaria (EP) y en Educacion Infantil (EI) de la Universitat de Valencia. Los datos analizados provienen de la experimentacion de una serie de practicas pedagogicas encaminadas al desarrollo y mejora de las competencias comunicativas academico-profesionales de ambas titulaciones y a todas luces convergentes con los principios del marco metodologico del EEES: (1)…
Patrones de participación y logro en un MOOC de Saberes Digitales para Docentes en servicio de México
2019
En este artículo se investigaron los patrones de participación y logro de más de 8000 participantes en un MOOC de Saberes Digitales para Docentes mediante estadística descriptiva y análisis de conglomerados en función de edad, género y nivel educativo. Los resultados indican que los participantes de mayor edad y nivel educativo obtuvieron mejores niveles de logro y participaron más en el foro de discusión. No se encontraron diferencias significativas entre género. La participación global siguió un modelo de embudo en donde existe un decremento notable de la participación a partir de la primera actividad para estabilizarse a partir de la quinta. El curso descansó sobre una base de confianza …