1,720,952 research outputs found
On Safety Assessment and Base Isolation of Heavy Non-structural Monolithic Objects
No full textAbstractUnder seismic actions heavy non-structural objects, which are usually placed at the top of existing constructions, may constitute a danger to human lives and a considerable loss for world heritage. In this contribution, safety assessment of non-structural monolithic objects is discussed through the illustration of a case study, which concerns seismic protection of eleven ancient marble decorative pinnacles placed at the top of a three-arched masonry city gate in Ferrara (ITALY). A method for assessing the safety of the underlying masonry structure under the action of seismic excitations is outlined and the amplification of the ground motions due to the presence of such structure is evaluated
Economic Feasibility Study of a Small-scale Biogas Plant Using a Two-stage Process and a Fixed Bio-film Reactor for a Cost-efficient Production
No full textAbstractEuropean and Italian incentive schemes promote small-scale biogas plant distribution using different types of biological and agricultural wastes as feedstock. A feed in tariff system is used in most of the European Union countries, and the incentive is paid on top of the market price capped at a maximum amount sold.The proposed study explores the feasibility of two-stage biogas plants for small-scale CHP, based on a two-phase bio-film process partially tested during the Biowalk4Biofuels (B4B) FP7 project implementing an Anaerobic Digestion (AD) based on a rotating biological contactor thus able to combine significant yields and reduced volume. The project developed a small pre-industrial biogas plant implementing a recovered 45 kWel CHP unit with 95 kWth thermal power. In the two-stage process, a high-temperature hydrolysis phase was followed by a continuously stirred methanogenesis bioreactor equipped with a rotating biological contactor. Main process performances were related to Organic Load Rate (OLR) up to 15kg VS/m3; the overall reactor volume was 70 m3 for expected biogas production of 25 Nm3/h.Specifically, the aim of the present article is to address the use of the results and outcomes from some laboratory tests verified by the B4B system to model an overall feasibility evaluation. This allows to explore theoretical and economic feasibility of two ideal plants characterized by a 50 and 150 Nm3/h biogas production based on the overall system performances implementing a fixed biofilm for enhancing methanogenesis process. The feasibility study for the 50 Nm3/h biogas plants (equivalent to 100 kWel) shows profitable results, as well as evaluation of the 150 Nm3/h plants (300 kWe), that represent the biggest size for Italian incentives aimed at “small size” biogas plants
Formal modification strategies for the construction of Public Spaces in urban regeneration projects of European cities
No full textWorkshop 1. Public space and neighbourhood quality The construction or reconstruction of outdoor public spaces is a key aspect of many urban regeneration projects in suburban or derelict areas of various European cities. This paper reports the analysis of the strategies that have been used in three urban regeneration projects in Denmark, France and Scotland in order to highlight common patterns and recent trend
A Comparative Study of Thermo-Mechanical Fatigue Performance of Different Grades of SiMo Nodular Cast Iron
No full textThis thesis is a comparative study of the Thermo-Mechanical Fatigue (TMF) performance of different grades of SiMo nodular cast iron for heavy-duty diesel engine exhaust gas manifold applications. The TMF performance of the current SiMo variant used to manufacture exhaust manifolds - SiMo 5.10 (C-3.25Si-4.45Mo-0.76), is compared with that of the variants SiMo 4.05 (C-3.22Si-4.66Mo-0.56) and SiMoNi (C-3.3Si-4.5Mo-1Ni-1.3) by performing three out-of-phase (OP) TMF test series under partial constraint conditions. A benchmark TMF test series in the temperature range: 50 ˚C to 550 ˚C with a hold time of 30 s at 550 ˚C showed that SiMo 5.10 had relatively better performance due to development of lower mechanical crack driving forces compared to other variants. However, a long holding time of 600 s at 550 ˚C saw a larger decrease of average TMF lifetimes for SiMo 5.10 than that of SiMo 4.05 despite similar crack driving forces. An investigation of the stress relaxation during TMF of the two variants showed that the SiMo 4.05 performs better during long hold time due to better stress relaxation properties. The SiMoNi variant which is very brittle at low temperatures was found to fail by a fracture by overloading mechanism taking over quite early in the fatigue cycle; which is confirmed by examination of the fracture surfaces and numerical estimations. This also explained the low lifetimes and scatter in previously performed TMF tests under total constraint conditions. The TMF test series performed in the temperature range: 150 ˚C to 550 ˚C with a hold time of 30 s at 550 ˚C found that a heat-treatment seemed to reduce the TMF performance of the SiMo 5.10 variant. Metallographic investigations and hardness measurements of as-cast and heat-treated materials revealed that the distribution of the Mo-rich phase from the grain boundary regions into the matrix due to an annealing heat-treatment seemed to affect the TMF performance.Materials Science and Engineerin
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
UGO FOSCOLO: INTELECTUAL, POETA, ENSAÍSTA
Get PDFThe Italian author Ugo Foscolo (1778-1827) developed his literary activity in avery peculiar moment of Italian history: the instauration of Napoleon’s government in thepeninsula. Foscolo has not remained apathetic to the political matters which affected his time,and this article aims to analyze how the author’s ideas on the function of poetry are related to hisactivities as an intellectual, essayist and critic of society.O autor italiano Ugo Foscolo (1778-1827) desenvolveu a sua atividade literária nummomento muito peculiar da história italiana: a instauração do governo napoleônico na península.Foscolo não se manteve apático às questões políticas que afligiam o seu tempo, e o presenteartigo objetiva analisar como as idéias do autor sobre a função da poesia se relacionaram com asua atividade de intelectual, ensaísta e crítico da sociedade
A crítica literária na Itália napoleônica: avaliações e contribuições de Ugo Foscolo
Get PDFThis paper analyses the ideas of the Italian author Ugo Foscolo (1778-1827) aboutthe literary criticism contained in his essays about literature, and demonstrateshow the metodology proposed by the author contributed to the renewal of theliterary criticism in Italy between the eighteenth and nineteenth centuries.O artigo analisa as ideias do autor italiano Ugo Foscolo (1778-1827) sobre acrítica literária presente nos seus ensaios sobre literatura, e demonstra como ametodologia proposta pelo autor contribuiu para a renovação da crítica literáriana Itália entre os séculos XVIII e XIX
A crítica literária na Itália napoleônica: avaliações e contribuições de Ugo Foscolo The literary criticism in Napoleonic Italy: assessments and contributions of Ugo Foscolo
No full textO artigo analisa as ideias do autor italiano Ugo Foscolo (1778-1827) sobre acrítica literária presente nos seus ensaios sobre literatura, e demonstra como ametodologia proposta pelo autor contribuiu para a renovação da crítica literáriana Itália entre os séculos XVIII e XIX.This paper analyses the ideas of the Italian author Ugo Foscolo (1778-1827) aboutthe literary criticism contained in his essays about literature, and demonstrateshow the metodology proposed by the author contributed to the renewal of theliterary criticism in Italy between the eighteenth and nineteenth centuries.</div
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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