960 resultados para lithic resources exploitation
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Changes in population age structure are a major concern and represent a priority in the agendas and policies of the developed world, which are demanding for renewed models of social and healthcare as well as assistance services to the elderly population. Studies indicate that as far as possible these types of services should desirably be provided at the user’s home, and that ICT-based solutions can have tremendous impact on the delivery of new services. This paper highlight and discusses some of the main results of a project undertaken in a Portuguese Municipality that demonstrates the potential contribution of an e-Marketplace of care and assistance services to the well-being of elderly people. Studies undertaken allowed identifying the main services that should be provided by such e-Marketplace (termed GuiMarket), the relevance that the population grant to this platform and, conversely, the fact that the Digital Divide phenomena influences the potential utilization of this project (and alike projects). The findings support that there is a strong relation between age and qualifications, and between access to ICT and the intended use of GuiMarket.
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Dissertação de mestrado em Design e Comunicação de Moda
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An empirical system was developed to obtain a quality index for rock slopes in road infrastructures, named Slope Quality Index (SQI), and it was applied to a set of real slopes.The SQI is supported in nine factors affecting slope stability that contemplate the evaluation of different parameters. Consequently, each factor is classified by the degree of importance and influence by assigned weights. These weights were established through a statistical analysis of replies to a survey that was distributed to several experienced professionals in the field. The proposed SQI varies between1 and 5, corresponding to slopes in very good and very bad condition state, respectively. Besides the advantage linked to a quantitative and qualitative evaluation of slopes, theSQI also allows identifying the most critical factors on the slope stability, which is a fundamental issue for an efficient management of the slope network in the road infrastructure, namely in the planning of conservation and maintenance operations.
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Conflicting opinions are recorded in the literature concerning the suitability of Amazon lands for sustainable agriculture following deforestation. This article has been written to shed light on this question by summarizing climate, landform, soil and vegetation features from the findings of a land resource study of the Brazilian state of Rondônia in south-west Amazonia. The work, which followed the World Soils and Terrain Digital Database (SOTER) methodology, was financed by the World Bank. During the course of the survey special emphasis was given to studying soils; 2914 profiles were analyzed and recorded. The study identified a complex pattern of land units with clear differences in climate, landform, soils and native vegetation. Forested areas mosaic with lesser areas of natural savannas. The latter occur on both poorly-drained and well-drained, albeit nutrient deficient sandy soils. The tallest and most vigorous forests or their remnants were seen growing on well-drained soils formed from nutrient-rich parent materials. Many of these soils could, or are being used for productive agriculture. Soils developed on nutrient-poor parent materials support forests that are significantly lower in height, and would require large lime and fertilizer inputs for agriculture. Low forests with high palm populations and minor areas of wet land savannas cover the poorly drained soils. It is evident that forest clearing in the past was indiscriminant; this cannot be condoned. The diversity of land conditions found throughout Rondônia would suggest that many past studies in the Amazon have simply been too broad to identify significant soil differences.
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Due to water scarcity, it is important to organize and regulate water resources utilization to satisfy the conflicting water demands and needs. This paper aims to describe a comprehensive methodology for managing the water sector of a defined urbanized region, using the robust capabilities of a Geographic Information System (GIS). The proposed methodology is based on finding alternatives to cover the gap between recent supplies and future demands. Nablus which is a main governorate located in the north of West Bank, Palestine, was selected as case study because this area is classified as arid to semi-arid area. In fact, GIS integrates hardware, software, and data for capturing, managing, analyzing, and displaying all forms of geographic information. The resulted plan of Nablus represents an example of the proposed methodology implementation and a valid framework for the elaboration of a water master plan.
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The authors propose a mathematical model to minimize the project total cost where there are multiple resources constrained by maximum availability. They assume the resources as renewable and the activities can use any subset of resources requiring any quantity from a limited real interval. The stochastic nature is inferred by means of a stochastic work content defined per resource within an activity and following a known distribution and the total cost is the sum of the resource allocation cost with the tardiness cost or earliness bonus in case the project finishes after or before the due date, respectively. The model was computationally implemented relying upon an interchange of two global optimization metaheuristics – the electromagnetism-like mechanism and the evolutionary strategies. Two experiments were conducted testing the implementation to projects with single and multiple resources, and with or without maximum availability constraints. The set of collected results shows good behavior in general and provide a tool to further assist project manager decision making in the planning phase.
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Current societal challenges increasingly demand the need to seek for efficient and sustainable solutions to daily problems. Construction, as a result of its activity, is one of the main responsible industry for the exploitation of resources and greenhouse gas emissions. In this way, several research works are being undertaken to change some of the current practices. This paper presents the work being done at University of Minho to study de degradation of natural fibers when used as a sustainable solution for soil reinforcement. Jute and sisal fibrous structures (0º/90º) were studied in terms of their degradation over time, when incorporated into soil and when subject to accelerated aging tests in a QUV weathering test equipment. Results show that the process of biodegradation of natural fibers is clearly accelerated by the action of temperature, moisture and solar radiation, explaining further degradation of jute and sisal fibers when exposed to these factors, although more pronounced in jute fabric structures.
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Projeto de Investigação integrado de mestrado Internacional em Sustentabilidade do Ambiente Construído
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Tese de Doutoramento em Estudos da Criança (Especialidade em Educação Musical)
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Dissertação de mestrado em Sustentabilidade do Ambiente Construído
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Dissertação de mestrado integrado em Engenharia Civil
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Relatório de estágio de mestrado em Ensino de Português no 3º Ciclo do Ensino Básico e Ensino Secundário e de Espanhol nos Ensinos Básico e Secundário
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Dissertação de mestrado em Ciências da Educação (área de especialização em Tecnologia Educativa)
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Dissertação de mestrado em Bioengenharia
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En este proyecto se pretende demostrar que existen alternativas sustentables al monocultivo de soja y económicamente factibles si se consideran los costos ambientales.Se cumplirán los siguientes objetivos específicos:- Caracterizar la sensibilidad de indicadores de calidad del suelo: infiltración, densidad aparente, penetrometría, C orgánico, fracciones de la MO y un índice químico de disponibilidad de N. - Medir escurrimiento y erosión en dos microcuencas con manejos contrastantes donde existe instrumental instalado y registros desde hace mas de 10 años.- Establecer rangos para las situaciones encontradas en los suelos representativos de la región.- Integrar los parámetros considerados en un sistema de diagnóstico de calidad/salud del suelo, para las condiciones de la región. - Aplicar el sistema de Calidad/salud del suelo para situaciones con monocultivo de soja y otras alternativas.- Calibrar y aplicar el modelo de simulación de la materia orgánica AMG, al monocultivo de soja y otras alternativas, a distintas escalas temporales y espaciales.- Estimar los costos ambientales de monocultivo a partir de los datos obtenidos.- Extrapolar los resultados del monocultivo y las otras alternativas a los suelos característicos, para estimar la sustentabilidad de los suelos en el centro-norte de la provincia de Córdoba.Se trabajará en dos áreas piloto en campos de productores, con y sin erosión hídrica. Se evaluarán parámetros indicadores del estado de los suelos, se los integrará en un sistema, se evaluarán los suelos con situaciones de monocultivo de soja y manejos contrastantes y se los correlacionará con su historial de intervención antrópica. Se brindará una herramienta apta para el ordenamiento territorial.