1,304 research outputs found
Six Sigma methodology: an effective tool for quality management.
The quality standards of the output, the features of delivery and the
introduction of new services are becoming the most important factors to
success in business performance. In this context, the application of new
methodologies is essential to increase the business performance. Six Sigma can
give an important solution for those companies that intend to highlight the
customer satisfaction focusing on the continuous improvement of the processes.
The purpose of this paper is to show the power of the Six Sigma methodology
in increasing the performance level of industrial processes and systems.
The paper shows a Six Sigma case study applied to the automotive market
Improvement through process integration using a simulative, dynamic method
The need for globalisation, the saturation and instability of markets, the life-cycle time reduction of products, the growth of item variety, the customer demands have been main factors contributing to a radical change of management conceptions and strategies. This complex environment has induced companies to search the keys to achieve competitiveness, focusing on process integration. The purpose of the paper is to explain how managing the internal functions of a company in an integrated way can lead to an effective improvement. In order to represent the flows and to quantify improvements, a simulative, dynamic and integrated model is developed
Il ruolo della robustezza strutturale nella impostazione ingegneristica della sicurezza antincendio
Design of a beamline for soft and deep lithography on third generation synchrotron radiation source
ELETTRA is a third generation synchrotron radiation source. The energy spectrum allows the design of beamlines suitable for x-ray lithography from soft to hard x-ray wavelengths. An appropriate lithographic window for micro- and nanofabrication can be obtained by a combination of selected filters and mirrors. As the beamline is interfaced to a vertical x-ray stepper, a uniformity in the beam intensity better than 3% (3σ) in the horizontal direction has to be reached. The present beamline is designed by taking into account the main factors which can affect the beam quality, namely, thermal loading on mirrors and filters, slope errors, and surface roughness of the mirrors. The resulting lithographic resolution at soft x-ray wavelengths is better than 100 nm
Les recettes thérapeutiques du manuscrit Vossianus latinus 96 A de l’Université de Leyde ou la découverte du vieux breton
Shear-induced reaction-limited aggregation kinetics of Brownian particles at arbitrary concentrations
The aggregation of interacting Brownian particles in sheared concentrated
suspensions is an important issue in colloid and soft matter science per se.
Also, it serves as a model to understand biochemical reactions occurring in
vivo where both crowding and shear play an important role. We present an
effective medium approach within the Smoluchowski equation with shear which
allows one to calculate the encounter kinetics through a potential barrier
under shear at arbitrary colloid concentrations. Experiments on a model
colloidal system in simple shear flow support the validity of the model in the
range considered. By generalizing Kramers' rate theory to the presence of
collective hydrodynamics, our model explains the significant increase in the
shear-induced reaction-limited aggregation kinetics upon increasing the colloid
concentration
Laccobius leopardus sp. nov. from the Western Cape of South Africa (Coleoptera: Hydrophilidae).
Bilton, David T., Gentili, Elio (2014): Laccobius leopardus sp. nov. from the Western Cape of South Africa (Coleoptera: Hydrophilidae). Zootaxa 3835 (3): 397-400, DOI: http://dx.doi.org/10.11646/zootaxa.3835.3.1
Rimozione di sedimenti per fluitazione dal serbatoio di Sernio (SO)
Il presente lavoro descrive la rimozione di un ingente quantitativo di sedimenti
(circa 100'000 tonnellate) dal serbatoio di Sernio, in provincia di Sondrio, effettuata
tra maggio e luglio del 2009. Il sedimento \ue8 stato evacuato per fluitazione
(flushing), nel sostanziale rispetto dei vincoli preventivamente stabiliti sulla
concentrazione di solidi sospesi (CSS) delle acque scaricate. Tali limitazioni hanno
lo scopo di contenere l\u2019impatto delle operazioni sugli ecosistemi acquatici coinvolti.
La CSS \ue8 stata controllata regolando il livello nel serbatoio, la portata in uscita e,
in un secondo tempo, mediante l\u2019utilizzo di escavatori meccanici. La gestione delle
operazioni si \ue8 basata sul costante monitoraggio della CSS poco a valle dell\u2019area di
intervento. La campagna di misura \ue8 stata ulteriormente estesa a valle, per un tratto
di circa 40 km lungo l\u2019asta dell\u2019Adda, al fine di quantificare la riduzione della CSS
per effetto combinato di diluizione e deposizione
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