10,478 research outputs found
La lingua delle città: i dati di Roma, Latina, L’Aquila e Catania
No full textIl volume raccoglie vari saggi che commentano i risultati delle inchieste svolte dall’unità romana per il PRIN nazionale “La lingua delle città (LINCI)”. Attraverso la somministrazione – in ogni centro indagato – di un questionario (costituito da 200 domande) a 12 informatori diversi per sesso, età ed estrazione sociale, la ricerca ha inteso saggiare la componente regionale (non esclusivamente a livello lessicale) nell’italiano parlato in varie realtà cittadine della Penisola. I saggi qui raccolti presentano e commentano i dati delle inchieste condotte a Roma (a cui sono dedicati i saggi dei due curatori), a Latina e in altri centri laziali, a L’Aquila e a Catania
Experimental Analysis, Modeling and Control of Volumetric Radial-Piston Pumps
No full textAn experimental-theoretical study has been carried out on high-pressure volumetric radial-piston pumps for diesel fuel injection systems. The dependence of the pump inducted flow rate on speed and load was investigated and the characteristic curve of the pump cooling-lubrication circuit was derived. The head-capacity curves were determined for different types of pumps at different revolution speeds and compared with the injector flow requirements in order to evaluate the pressure-control strategy efficiency. An insight into the ageing effects on the pump performance was also provided. Furthermore, the dynamic pump behavior was investigated, with specific reference to the flow-rate ripple at the delivery port. A general analytical expression has been derived for the volumetric efficiency. Furthermore, a specific procedure has been developed and applied to the experimental evaluation of the fuel leakages in pressure control valve (PCV) integrated pumps. Finally, the mechanical-hydraulic efficiency of the pump has experimentally been assessed as a function of head and speed in order to obtain a reliable evaluation of the pump shaft power and torque at different working condition
Speed Dependence of Turbulence Properties in a High-Squish Automotive Engine Combustion System
No full textTrichoglossum hirsutum var. hirsutum (Pers.) Boud. (Geoglossaceae, Helotiales) un nuevo registro en el Noroeste Argentino
No full textCatania, Myriam del Valle y Andrea I. Romero. 2007. “Trichoglossum hirsutum var. hirsutum (Pers.) Boud. (Geoglossaceae, Helotiales) un nuevo registro en el Noroeste Argentino”. Lilloa 44 (1-2). Se registra por primera vez para la Argentina, en la provincia de Tucumán y Catamarca a Trichoglossum hirsutum var. hirsutum (Pers.) Boud. Se describe, incluyendo ilustraciones y fotografías
Microcallis negii (Chaetothyriales, Ascomycota) primer registro para la Argentina y sobre Podocarpus parlatorei
No full textCatania, Myriam del V. y Andrea I. Romero. 2011. “Microcallis negii (Chaetothyriales, Ascomycota) primer registro para la Argentina y sobre Podocarpus parlatorei”. Lilloa 48 (2). Se cita a Microcallis negii por primera vez para Sudamérica y Argentina. Se describen los ascomas peritecioides, sus características macroscópicas y microscópicas; incluyendo ilustraciones. Se aporta información sobre su distribución geográfica y hábita
Extraction Techniques and Analysis of Turbulence Quantities From In-Cylinder Velocity Data
No full textASME TRANSACTIONS, JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWE
Development and assessment of a new operating principle for the measurement of unsteady flow rates in high-pressure pipelines
No full textInstantaneous mass flow rate measurements in high-pressure transmission pipelines under transient flow conditions can be valuable for the analysis of hydraulic power systems. However, at present no reliable commercial measuring device is available for pressure levels beyond 300 bar. A new operating principle, of general application, for measuring the flow rate in high pressure flows (from 300 to 2000 bar) was developed and assessed. The innovative device was capable of accurately evaluating the instantaneous mass flow rate on the basis of the pressure time-histories detected at two different locations by high pressure transducers. The measurement operating principle was detailed and technical indications for the flowmeter correct design were provided. For validation purposes, the flow rate measurements taken at the inlet of a Multijet Common Rail (CR) injector were compared to the theoretical data predicted by an ad-vanced numerical model of the complete fuel injection system. The developed flowmeter was then applied to characterize the flow rate ripple at the delivery of the CR high-pressure reciprocating pum
Numerical Computation of Axisymmetric Turbulent Flows in a Diesel Engine on Compression Stroke
No full textProblems of Turbulent Flow Parameter Definition and Measurement in Reciprocating I.C. Engines
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