Search results for "Sources"
showing 10 items of 2554 documents
Plants for Environmental Protection
2023
Plants for environmental protection are Anaerobic Digestion plants for converting biomass as Renewable Energy Source (RES), i.e. biowaste, agricultural feedstock, livestock effluents (manure and slurry) and food industry by-products, into biogas, i.e. bioenergy, as well as digestate, i.e. biofertiliser. In turn, biogas can be converted into electrical and thermal energy or can be used for extracting biomethane, i.e. biofuel, or can be injected in the natural gas grid. Moreover, digestate can be divided into solid and liquid fractions, that can be used for fertilisation or fertirrigation, respectively, sometimes after aerobic composting.
Quality of Lake Ecosystems and its Role in the Spread of Invasive Species
2021
Abstract Lake ecosystems are important elements of hydrological regime, the quality of these ecosystems is affected by anthropogenic actions, and therefore, a variety of organisms, living in these habitats depend on the applied management solutions. Due to human activities freshwater ecosystems suffer from loss of biodiversity and increased eutrophication. Therefore, important aspects related to lake management include knowledge about the water quality, ecosystem response to climate change as well as increased risks of appearance and spreading of invasive species. Water quality, content of oxygen, nutrients, phytoplankton and distribution of macrophytes, including invasive species were anal…
Challenges for the Goal of 100% Renewable Energy Sources to Fit the Green Transition
2022
The increasing penetration of Renewable Energy (RE) into the electrical market is desirable in terms of sustainability. Nevertheless, it is a challenge that all the interested actors shall address from both the technical and economical points of view. This paper provides an overview of the main challenges and solutions towards the technological transition to an electrical system with 100% renewable energy sources in terms of innovations and operative limits of the traditional systems. These innovative paradigms will also address the social impact and government policies.
Case Study of Potential Production of Renewable Energy Sources (RES) from Livestock Wastes in Mediterranean Islands
2017
The aim of this work is to evaluate the potential production of Renewable Energy Sources (RES) from livestock wastes that are commonly found on Mediterranean islands, by using the island of Malta as a case study. Organic wastes in the form of livestock manure and slurry, as well as other by-products originating from the food transformation industry in the making of alcoholic beverages and the processing of olives, tomatoes and other streams, if mixed in such a way to achieve a correct C/N ratio, can be subjected to anaerobic co-digestion for the production of biogas and digestate. Biogas can be further transformed into biomethane, a fuel that can be used to power surface transportation and …
The influence of the stochastic features of the energy source on the design of an electromagnetic generator
2009
The purpose of this paper is to clarify in a general way how the unavoidable randomness of renewable energy sources influences the magnetic design of electric generator. A general model of electro magnetic generator based on the well known d-q axes analysis is given. The energy source is modelled as a stochastic variable and is included in the equations of the system. The equations are solved and, therefore, the energy output of the system is linked to the random characteristic of the energy source. As a result, the magnetic circuit and the parameters of the generator that maximize the energy extraction can be found and generally linked to the stochastic details of the source.
RePEc o cómo proveer servicios de valor añadido a una comunidad de investigadores
2013
Se describe RePEc (Research Papers in Economics), uno de los repositorios temáticos más antiguos y con más contenido de los existentes. Se presta especial atención a los servicios de valor añadido que ofrece y que convierten a RePEc en una iniciativa única, con una gran aceptación dentro de su disciplina. Finalmente se hace una breve referencia al modelo de negocios que se utiliza y que se basa en el trabajo voluntario de miles de personas de todo el mundo.
Bibliotēka kā universitātes informācijas un mācību telpa
2014
Latvijas Universitātes un Ukrainas sadraudzības augstskolu pētnieku un bibliotēku darba profesionāļu rakstu kopīgais krājums atspoguļo bibliotēku un informācijas nozares zinātniskās un lietišķās pētniecības darba rezultātus. Rakstu autori analizē bibliotēku pakalpojumu mērķtiecīgo attīstību mūsdienu informācijas vidē un augstskolu mācību infrastruktūrā. --- The collection of papers of the researchers and library professionals of the University of Latvia and Ukrainian universities reflects on scientific and applied research activities. The authors of the articles describe the purposeful development of library services in the modern-day information world and academic infrastructure.
Advancing collaborative creativity in the context of Greek teachers' in-service training in environmental education
2009
This paper presents the research design of a case study aiming to enhance Greek environmental educators' competence in collaborative creativity through online training. The study, which is part of an on-going research project, entails the design of an e-learning course, the development and evaluation of a collaborative creativity framework called Hybrid Synergy and an associated tool to support it, and the identification of specific patterns related to the participants' engagement with the provided e-learning activities.
First results of PACTE group's experimental research on translation competence acquisition : the acquisition of declarative knowledge of translation
2014
Autors llistats per ordre alfabètic. Investigadora principal: A. Hurtado Albir This paper presents the first results of empirical-experimental research into the Acquisition of Translation Competence (ATC): the acquisition of declarative knowledge about translation. This study is based on our previous research about Translation Competence (TC). Some of the data collection instruments have, however, been adapted for current use. Details of our research design include type of study, universe and sample population, study variables, data collection instruments, and data analysis processes. The dependent variables were knowledge of translation; translation project; identification and solution of …
Supporting parenting of infants: evaluating outcomes for parents and children in a community-based program.
2012
This research presents an evaluation of the intervention dose-effect of the Parent-Child Psychological Support Program (PCPS). The PCPS is a universal community-based program to support parenting, during the first 18 months, and to promote protective adaptive systems in children through a schedule of quarterly office-based appointments, starting at 3 months of age. Generally children attend for six visits. When the Program opens in a particular area, parents of all children under 18 months are invited. The different ages of the children who are joining present a unique opportunity to obtain groups to evaluate the program dose-effect using a cohort-sequential design. This dose-effect on pare…