889 research outputs found
Preliminary aerothermal design of axial compressors
No full textThis dissertation documents a compressor preliminary design study conducted by the author
in fulfilment of his MSc thesis requirements. The compressor is intended for a new
development engine within the 20Klbf thrust category, planned to be used on a short-haul
aircraft, namely the ERJ-190.
A market research suggests that there exists a definite opportunity for a commercially
profitable engine within this thrust class. Furthermore, the proposed new engine is projected
to outperform current production engines on critical issues such as fuel efficiency and
operability.
By and large, the objectives of this work have been achieved and a compressor design and
layout is suggested, which matched or exceeded all the initial requirements. The quality of
the results from this study are thought to be of sufficient detail to allow a further, more
detailed development study to resolve some subtle pending issues. It is expected that, some
compressor stages may have to be altered slightly during detailed design to augment their
performance and ease of manufacture and assembly.
Throughout this study, the importance of the compressor design figure of merits, pertaining
to a short haul engine, has been outlined and their interaction on the design process is well
documented. Furthermore, some rather unorthodox objectives such as compressor
performance retention and reliability have been discussed. The author approached these
subjects in an innovative way due to the limited non-proprietary knowledge available on
these issues, especially considering their implications within preliminary design.
Furthermore, the author developed and tested a new preliminary turbomachinery design code,
named Turbodev, which can be used as an aid in future compressor design endeveours.
Turbodev can handle most types of compressor layouts and generates an overall aerodynamic
assessment of the turbomachinery performance.
In conclusion; this documentation and the associated literature review aim to provide the
reader with an overview of the work done and yield a better understanding of the decisions
that face any design bureau when developing a new or modified engine component.The research work disclosed in this publication is partially funded by the
Strategic Educational Pathways Scholarship Scheme (Malta). The
scholarship is part-financed by the European Union – European Social
Fund under Programme II – Cohesion Policy 2007-2013
Cartolina/Postcard
No full textIl contributo esplora il lemma 'cartolina' ed il suo utilizzo nella pratica della progettazione archiettonic
L'Azienda Pubblica Sostenibile: La Ricerca di un Equilibrio tra Efficacia, Efficienza e Sostenibilità
No full text
Progression in Keratoconus
No full textABSTRACT
The study of keratoconus progression was once based upon slitlamp study, keratometry, and placido disk image examination. Today we have a lot of new corneal devices and indexes wich can help the ophthalmologist to make earlier the diagnosis and also to recognize as much is possible a progressive keratoconus. Only a deep knowledge of the meaning of all these indexes and values, together with the ability to interlock one another, increases reliability in the evaluation of Corneal Ectasia. Some pratical instructions are provided to help the early diagnosis of progressive Keratoconus.
How to cite this article
Vinciguerra P, Piscopo R, Camesasca F, Vinciguerra R. Progression in Keratoconus. Int J Kerat Ect Cor Dis 2016;5(1):21-31
Strane bellezze
No full textIl saggio è l'introduzione a un volume, a cura di R.Amirante, C. Piscopo, P. Scala che raccoglie alcuni dei contributi presentati in occasione della quinta edizione del Convegno EURAU "Venustas, architettura, mercato, democrazia" e parte degli esiti della ricerca PRIN 2009 dal titolo "come si valuta la venustas dell'architettura".
I cambiamenti di significato che il termine "venustas" subisce per effetto dei tanti cambi di paradigma della contemporaneità sono al centro del saggio e sono tenuti insieme dal termine "strano". Questo termine "strano" viene declinato in vari modi per spiegare la natura e le conseguenze del cambiamento di significato di un termine che sta alla base dell'idea di architettura della classicità occidentale: a contatto con i cambiamenti di prospettiva della contemporaneità, la bellezza diviene sempre più "strana", nel senso migliore del termine, quello che può spingere a investigarla nuovamente nella sua dimensione sempre più plurale
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