Search results for "construction"
showing 10 items of 2670 documents
Ground-Mounted Photovoltaic and Crop Cultivation: A Comparative Analysis
2022
Human civilization depends on energy sources, mainly fossil fuels. An increase in the prices of fossil fuels and their exhaustibility limit economic growth. Carbon dioxide emission causes global environmental problems. Global crises (including COVID-19) have sharpened food and energy supply problems. The decentralized energy supply systems as well as the expedition of the application of renewable energy may solve these challenges. The economic shift to renewable power generation intensifies the competition between food crop production and green energy for land. This paper applied an open-source spatial-based model to quantify the solar power generation (the ground-mounted photovoltaic panel…
Mixed Stone-timber Masonry in Traditional Construction: Structural, Architectural and Anti-seismic Features across Europe
2018
This paper investigates the stone masonry with timber reinforcement through the European traditional and historical architecture. It is a remarkable practice consisting of combining different materials to build up a masonry. This technology shows a wide variety of typological, formal, and technological types of buildings across Europe as it is strongly influenced by the nature and availability of local materials, the cultural aspects of the various communities, and the soils geological nature. As a consequence, the same constructive typology is based on different premises and leads to many interesting results. In this paper the various uses of such a mixed stone-timber masonry are shown in …
Les plafonds voûtés des traités historiques aux applications en Sicile
2016
I controsoffitti lignei voltati - a partire dal XVII secolo e con notevole diffusione ed impiego nel XVIII secolo in tutta l’Europa - hanno qualificato sia edifici pubblici e privati di pregio che anche gran parte dell’edilizia di base, per le loro caratteristiche di indipendenza strutturale, leggerezza e di facile assemblaggio delle parti. Lo studio e la ricerca vogliono restituire memoria dei materiali costitutivi e delle tecniche costruttive impiegate nella realizzazione dei manufatti, per offrire un utile strumento di conoscenza agli studiosi ed ai tanti operatori del settore impegnati nell’intervento di recupero e/o restauro. C’est grâce à l’indépendance structurelle, à la légèreté et …
Knowledge Management in the Project Life Cycle - Initial Research on Polish Smes
2014
Abstract Contemporary organizations run their activities in an environment, which might be defined as fully uncertain and turbulent. Due to variations that occur in the surrounding environment, an increased attention of management practitioners and theoreticians is paid to new management concepts frequently in an integrated version. The authors express a deep belief that consolidation of approaches to project management and knowledge management constitutes a response to challenge for modern organizations. Research into the issue was based on an attempt to determine significance of the knowledge management issue in a life of projects performed by Polish small and medium-sized enterprises (SM…
Impact of Separator Thickness on Temperature Distribution in Single Cell of Polymer Electrolyte Fuel Cell Operated at Higher Temperature of 90 °C and…
2022
The New Energy and Industry Technology Development Organization (NEDO) road map (Japan, 2017) has proposed that a polymer electrolyte fuel cell (PEFC) system, which operates at a temperature of 90 °C and 100 °C, be applied for stationary and mobility usage, respectively. This study suggests using a thin polymer electrolyte membrane (PEM) and a thin gas diffusion layer (GDL), at the same time, to achieve better power-generation performance, at a higher temperature than usual. The focus of this paper is to clarify the effect of separator thickness on the distribution of temperature at the reaction surface (Treact), with the relative humidity (RH) of the supply gasses and initial operation tem…
Ponti in Sicilia fra Sette o Ottocento. Il modello dell'acquedotto romano
2015
Nella seconda metà del XIX secolo in Sicilia furono costruiti diversi ponti. Essi riprendevano ancora il modello degli antichi acquedotti romani, modello rilanciato nell'isola, negli anni Settanta del XVIII secolo, da Ignazio Paternò Castello, V principe di Biscari, che costruì un grandioso ponte acquedotto nel feudo di Aragona, presso Catania. Fin dal tado Settecento e nel corso del XIX infatti questo modello fu riattualizzato e si diffuse in tutta Europa attraverso numerosi trattati specialistici, portando alla realizzazione di strutture similari, con diversi ordini di arcate a tutto sesto. In the second half of 19th century some bridges were built in Sicily. They still raised the model o…
Federaliści i rozłam między klasycznością a modernością
2014
The article shows how the classical political thinking, based on civic virtues, and modernist thinking, based on individualism and self-interest, formed the basis of the U.S. Constitution. The Founding Fathers did not realize the full extent of the rift between classicism and modernity. When, as a result of intellectual discussions and practice of social life, this divide began to become more and more obvious, there has been a transition from the classical to the modernist paradigm in American politics. However, the dispute between classicism and modernity still continues and takes on new forms. On the one hand, contemporary political thinking is seen as a triumph of modernism, in which the…
Petro-archaeology of Gallo-Roman lime mortar. Attempt to reconstruction and interpretation of the “chaînes opératoires”: from material to ancient cra…
2003
Petro-archaeological research on Gallo-Roman lime mortars is based on a simple analytical methodology: observations with optical microscopy in transmission, which brings us a maximum of data about the material and the various stages of the “chaîne opératoire”. This work enabled us to draw the general features of the craftmanship (common practices of the ancient structores and tectores), to establish the relations between mortar composition and its “primary” and “secondary” architectural function, then to perceive what are the markers and motivations of the formula adaptations. The importance of the geological environment is shown, because it induces economic and technical choices, requiring…
Design principles of educational virtual worlds for preschool children : a case study of JumpStart World Kindergarten's pedagogical methods
2010
This thesis studies the design principles of educational virtual worlds for pre-school children. It examines the culture and contextualization of the virtual worlds for children used for the purpose of informal education through learning games in the case study of JumpStart World Kindergarten. The theoretical background provides an overview of the historical development of educational virtual worlds based on the progression of MUDs, MOOs and MMORPG. In addition, the issues in implementation and adaptation of information and communication technologies (ICT) as part of educational methodologies are examined, thus a perspective is given of possible problems and solutions for optimization of us…
Legiones y Falanges: construcción lingüístico-discursiva del enemigo
2017
The press, in addition to reflecting a “vocation of information “, performs a series of social functions, among which the formation of citizens and of critical recipients of mediatic discourse stands out. Yet, especially in some socio-political contexts, the press can be a vehicle for a certain type of ideology, becoming an instrument to orient the recipient or, in extreme cases, manipulate them, in order to justify or reinforce the image of a dominant ideological group. In this sense, the magazine Legiones y Falanges (1940-43) is exemplary, since, with a clearly populist discourse, it aims to extol the ideological foundations of Franco’s dictatorship. In other words, the main objective of …