957 research outputs found
SHALLOW GEOTHERMAL SYSTEMS SUSTAINABILITY THROUGH A HOLISTIC APPROACH: THE CANTON TICINO TEST SITE (CH)
No full textDecenni di estrazione ed utilizzo di combustibili fossili hanno prodotto forti emissioni di gas clima-alteranti e una completa dipendenza da fonti non rinnovabili, con conseguenze politiche e socio-economiche. La transizione energetica che stiamo affrontando si affida alle energie rinnovabili, producendo un forte impatto sulla riduzione delle emissioni di CO2. Tra i diversi tipi di energie rinnovabili attualmente disponibili, l'energia geotermica superficiale rappresenta una delle migliori soluzioni per il condizionamento degli edifici grazie alla sua disponibilità e alla grande efficienza termica. Tali grandi vantaggi hanno portato ad un netto aumento delle installazioni in spazi progressivamente limitati, sollevando problemi di gestione relativi prevalentemente alla sostenibilità termica nel lungo periodo e ai potenziali conflitti tra utenti delle acque sotterranee. Nel presente lavoro, la gestione dei sistemi geotermici superficiali (SGS) è valutata a diverse scale spaziali partendo da un caso pilota in Svizzera. La prima parte del lavoro si è concentrata sulla realizzazione di mappe del potenziale tecno-economico, utili per una stima preventiva della fattibilità di un nuovo impianto a circuito chiuso. Il confronto tra queste mappe e l'attuale approccio gestionale derivante dalla normativa sulla protezione delle acque sotterranee ha mostrato che i settori nei quali nuovi sistemi sono consentiti sono spesso le aree dove si osserva un potenziale geotermico inferiore. La seconda parte del lavoro si è concentrata sull'analisi di un caso studio regionale utilizzando una procedura di caratterizzazione idrogeologica, monitoraggio e modellistica delle acque sotterranee. I risultati hanno dimostrato che la comprensione del reale stato termo-idrogeologico di un acquifero è la base fondamentale per eseguire un’analisi locale di sostenibilità termica per SGS, soprattutto nelle aree ad alta densità. La terza parte del lavoro ha proposto un modello numerico olistico idro/termogeologico per simulare l'attuale stato termico del sottosuolo di un'area urbanizzata e le potenziali interazioni tra SGS autorizzati, andando oltre agli attuali schemi di gestione che considerano ogni impianto come separato a fini di valutazione di sostenibilità idraulica/termica. I risultati hanno mostrato che l'elevata quantità di SGS installati in spazi limitati sta progressivamente creando reciproche interferenze idrauliche e termiche: negative, con una riduzione dell'efficienza e della sostenibilità o (raramente) positive quando si instaura un effetto sinergico accidentale dovuto a posizioni e profili di utilizzo favorevoli (pertanto non gestito). La restituzione attraverso la zona insatura del terreno potrebbe essere un valido metodo per ripristinare l’acquifero senza alterare in modo rilevante la temperatura dell’acqua sotterranea, garantendo così la sostenibilità a lungo termine di SGS in zone urbane. L'approccio multi-scala proposto consente di migliorare la gestione a diversi livelli. Nei prossimi anni il condizionamento degli edifici si baserà sempre più su SGS per garantire la domanda di energia termica, con un conseguente aumento del numero di richieste di autorizzazione in spazi limitati. Saranno quindi sempre più richiesti studi olistici multi-scala, come quello proposto, per fornire l'informazione tecnico/scientifica necessaria per una migliore gestione, valutando la sostenibilità termica a lungo termine dello sfruttamento di energia geotermica superficiale, soprattutto in aree urbane
Techno-economic mapping for the improvement of shallow geothermal management in southern Switzerland
Get PDFCantone Ticino, a mountainous region located in the southern part of Switzerland, is greatly affected by the continuous growth of subsurface exploitation through the use of both closed-loop and open-loop geothermal systems. In this study, techno-economic maps for shallow geothermal potential of Cantone Ticino are produced, considering closed-loop systems. The work starts with the identification of the main parameters affecting the techno-economic potential such as GST and thermal conductivity. Maps for different indicators of techno-economic feasibility are created and compared against real data/measurements. An empirical method is tailored to derive a map of the techno-economic geothermal potential, expressed as meters required to provide 1 kW of installed power. The produced map shows an overall discrepancy from real installed length data of approximately ±23%. Moreover, compared with current regulation, the produced maps show an unoptimized management of the shallow geothermal resource, since high potential zones are commonly located where the installation of BHE is not permitted and often closed-loop systems are installed where the estimated potential is lower, mainly in alluvial fans. In light of these considerations, the authorization process in Cantone Ticino for BHE should be revised taking into account the real techno-economic potential
The Wine Attributes with the Greatest Influence in the Process of Consumer Choice in Spain
Get PDFThe commercialisation of wine in Spain is problematic due to two concrete circumstances: the decrease in wine consumption because of a consumer shift toward substitute drinks and the greater presence of national and foreign wine in the interior market, which involves an increase in business competitiveness. The increase in competitiveness of quality Spanish wine depends on producing enterprises’ knowledge of wine consumer preferences so they can offer consumers what they demand. In order to respond to this matter and better adapt supply, 421 wine consumers were surveyed using the Best-Worst Scaling methodology. Various segmentations were also made by consumer income and age groups. The results indicate that the two main attributes which condition consumers in choosing wine are the region of origin and having tasted it previously. The region of origin attribute is valued in general by consumers over 34 years old who have a monthly family income above 1,500 €. The attribute of having tasted it before, which on many occasions is associated with the price attribute, is valued particularly by younger consumers and those with lower incomes.Consumer behaviour, Wine attributes, Food Marketing, Consumer/Household Economics,
Intensive thermal exploitation from closed and open shallow geothermal systems at urban scale: unmanaged conflicts and potential synergies
Get PDFThe use of shallow geothermal systems (SGS) as a proficient technology to provide clean thermal energy has become increasingly widespread throughout the world, especially in urban environments, with a significant increase in systems density. At European level, the current authorization schemes for new SGS rarely consider the current thermal state of the subsurface and the potential presence of neighbouring systems. The paper presents a pilot urban case study, showing high SGS deployment, analysed through a holistic city-scale 3D numerical model simulating mutual interactions between open and closed-loop systems. Results show that the high amount of installed SGS in limited space is progressively creating mutual hydraulic and thermal interferences: negative, with a reduction of SGS efficiency and sustainability or (rarely) positive, when an accidental and unmanaged synergic effect is established due to favourable exploitation patterns and SGS locations. Numerical modeling further highlighted that the restitution through the vadose zone could be a valid method to hydraulically reinstate the aquifer without significantly altering groundwater undisturbed temperature even at shallow groundwater depth. Results show that neglecting an underground holistic vision of the hydro/thermogeological processes in urban areas could result in long-term severe efficiency losses and environmental issues for SGS solutions, also given the increasing use of shallow geothermal energy in the building air conditioning sector
Dr. Rodolfo D. Torres talk at University of Washington Tacoma: After Latino Metropolis
No full textThe role of class and spatial politics in Latino Los Angeles will be the subject of this timely talk. Professor Rodolfo D. Torres is co-author of the highly acclaimed book, Latino Metropolis (University of Minnesota Press, 2000). He will revisit this important book
How corporate governance and globalization can run afoul of the law and good practices in business: The Enron's disgraceful affair.
Get PDFThe purpose of this paper is to set out the Enron’s demise into the perspective of Corporate and Global Governance. To accomplish this target, the incremental cash flow model is expanded to give room for governance issues, while a functional introduction to information sets is developed, including bounded rationality, asymmetric information, opportunistic behavior, transaction costs and agency problems. Then, corporate governance is linked to globalization by means of some recent approaches that go beyond a narrow economic mindset to encompass a far-reaching dynamics. Taking advantage of such background, the Enron’s story is tracked down over a span of fifteen years since its starting day to its bankruptcy filing. Leading events are explained from corporate and global governance viewpoints, while an in-depth analysis is worked out on Enron’s complex game of deception and breach of contracts: the outrageous affiliated limited partnerships, the lavish pay package to its executives, the involvement with global governance through the Indian affair and the Taliban connection. It is for the incremental cash flow model to explain malfeasance with cash flows from assets, and how cash flows to creditors were actually contrived. Furthermore, to highlight how cash flows were swindled from stockholders and, finally, how Enron made wheeling and dealing with cash flows on behalf of its managers.corporate governance, global governance, incremental cash flow model, globalization, information sets, good practices.
Rodolfo Lenz
No full textIn this article the author intends to offer an overall profile of Dr. Rodolfo
Lenz’ versatile personality, portraying him as the man, the phonetician, the
expert scholar in Araucanian, the orthographer, the methodologist, the
compulsive scientist. All these personality traits contributed to renovate in
Chile the interest in language, in foreign language methodology and the
institutionalization of folklore as a science, which earned him the Chilean
nationalityEn este trabajo el autor se propone dar una visión de conjunto de la polifacética
personalidad del Dr. Rodolfo Lenz: el hombre, el fonetista, el araucanista, el
lexicógrafo, el gramático, el ortógrafo, el metodólogo, el científico compulsivo.
Aspectos todos que contribuyeron a renovar profundamente en Chile el
estudio de las ciencias del lenguaje, la metodología de la enseñanza de las
lenguas extranjeras y la fundación del folclor como ciencia, por todo lo cual
el Gobierno le confirió nuestra nacionalida
Synthesis through electrospinning of La1-xSrxCo1-yFeyO3 ceramic fibers for IT-SOFC electrodes
No full textEl funcionalismo de rodolfo lenz
No full textSummary
This paper deals with the contributions to Hispanic Linguistics by the German-Chilean linguist Rodolfo Lenz (1863–1935), some of whose proposals – often attributed to other scholars – may be seen as an alternative to the ideas of the prestigious Andrés Bello (1781–1865). The paper first reviews those aspects of his work which anticipate some of the basic tenets of Functional Grammar, such as the notion of ‘transposition’ (function shifting), his views on sentential structure, and his treatment of passives as attributive constructions. The paper also explores Lenz’s contributions to Indo-European linguistics and his theoretical affinities with, if not anticipations of, the work of other well-known linguists like Búhler, Tesnière, Hjelmslev, and Benveniste. In sum, the author seeks to vindicate Rodolfo Lenz and his insightful views in both general linguistic theory and Spanish grammar.</jats:p
Microencapsulation of phenolic compounds from olive pomace using spray drying: A study of operative parameters
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