3122035 documents found, page 46103 of 312204

Hydrogen absorption in epitaxial bcc V (001) thin films analysed by statistical...

Andersson, Aits and Hjörvarsson of Uppsala Universitymeasured hydrogen uptake in epitaxial bcc (body centred cubic) vanadium (V) (001) thin films of thickness, 50 nm and 100 nm, over temperature range between 443 K and 513 K. The reported equilibriumpressure–temperature–composition (P–T–C) relationships for the epitaxial bcc V (001) thin films showed appreciable extent of enhancement ofH solubility comparedwith...

The contribution of Portuguese solar thermal program on the country energy effi...

The solar radiation available all over the year is a strong reason to promote the utilization of this resource and during the year 2009, a new program based on a 50% subside, was promoted by the Portuguese government. As expected, a significant number of new installations were realized. In 2009 the state program provided the installation of more than 50,000 systems. The program can be considered a success on th...

A integração de energias renováveis em edifícios

Recent changes in lead isotopic signature in sediments of the Cascais Canyon (P...

Salinas interiores em Portugal : o caso das marinhas de Rio Maior

Nas orlas sedimentares mesozóicas de Portugal há ocorrências de águas cloretadas sódicas com salinidades elevadas, por vezes muito superiores à da água do Atlântico. Na Orla Algarvia ocorrem alguns casos, mas são mais frequentes na Orla Ocidental, sobretudo entre Leiria e Torres Vedras. No caso das que ocorrem na Orla Ocidental, aparecem associadas a afloramentos da Formação de Dagorda, do Jurássico inferior, u...

Grutas turísticas : património, emoções e sustentabilidade

O património é actualmente considerado como um dos eixos em torno do qual se desenvolvem diversas actividades económicas ligadas ao turismo cultural. Neste âmbito, merecem uma palavra particular as grutas habilitadas a permitir o acesso público e respectiva fruição. Portugal, quer no continente, quer nas Regiões Autónomas possui um património (geo)espeleológico de grande valor científico e cultural que atrai, a...

Building a collaboratory in an engineering R&D organization

This paper presents the results achieved throughout the process of preparing the ground to develop a collaboratory in an Engineering R&D organization. This case study is part of a broader research project engaged in building a collaboratory in order to share knowledge and resources among the Portuguese State laboratories. In the process of preparing the ground to develop the collaboratory in the first of the la...

Impact of Wind Generation Fluctuations in the Design and Operation of Power Sys...

In this paper, the impact of the wind time variability and the spatial smoothing effect in mountainous complex terrains, usually taken as 1/sqrt(N) for fast fluctuations, is studied. The dimension of the regions, the type of electrical clustering of large numbers of wind turbines and the local meteorological effects are addressed and conclusions drawn on selected experimental case studies.

Impacts of large amounts of wind power on design and operation of power systems...

There are a multitude of studies made and ongoing related to cost of wind integration. However, the results are not easy to compare. An international forum for exchange of knowledge of power system impacts of wind power has been formed under the IEA Implementing Agreement on Wind Energy. IEA WIND R&D Task 25 on "Design and Operation of Power Systems with Large Amounts of Wind Power" has produced a state-of-the-...

A new urban wind turbine blade design using a pressure-load inverse method

This paper presents the design methodology of a new wind turbine blade section that achieves high performance in urban environment by increasing the maximum lift. For this purpose, a turbomachine blade rows inverse design method was applied to obtain a new wind turbine blade section with constant pressure-load along the chord, at the design inlet angle. In comparison with conventional blade designs, the new bla...