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47 results on '"Clienti C"'

1. Fatigue limit by thermal analysis of specimen surface in mono axial traction test

Author

Clienti C., Giacomo R., and Risitano A.

Subjects
Physics, QC1-999
Abstract

In this work is indicated how it could be possible to evaluate the limit stress of the thermo-elastic phase of deformation by thermo-analysing the surface of the specimen during a static traction test. Adding the temperature curve measured on a small area of the surface (the hottest) to the classic stress-strain curve, it is possible to evaluate a limit temperature T0 coincident with the beginning of the non linear trend of the curve. The corresponding stress value is coincident with the fatigue limit of the analyzed component. As an example, the results of traction tests performed on two notched specimens, where the change of linearity in the temperature curve during static traction test was evident, are reported. The corresponding value of stress was a good approximation of the fatigue limit for R = - 1, determined by the conventional method. The aim of the reported examples in this paper must be interpreted as support to the basic principle of the method and not as the results of a complete experimental planning of which we will comment in an another occasion.

Published
2010
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12. Asymmetric gear wheel: thermographic analysis

Author

DI FRANCESCO, G, Marini, S, Grasso, Giovanni, Clienti, C., DI FRANCESCO, G, Marini, Stefano, Grasso, G, Clienti, C., DI FRANCESCO, Giulio, G., Grasso, and C., Clienti

Published
2004

13. Cytokine production in standard hemodialysis with a new polyethersulfone membrane: a cross-over study

Author

MEMOLI, BRUNO, Bisesti V, Saravo MT, Esposito P, D'Arcangelo R, Nicosia V, Clienti C, Andreucci M, Esposito A, Tetta C., Memoli, Bruno, Bisesti, V, Saravo, Mt, Esposito, P, D'Arcangelo, R, Nicosia, V, Clienti, C, Andreucci, M, Esposito, A, and Tetta, C.

Subjects
Male, Cross-Over Studies, Time Factors, Heparin, Interleukin-6, Polymers, Membranes, Artificial, Middle Aged, Reference Values, Renal Dialysis, Cytokines, Humans, Female, Sulfones, Uremia
Published
2003

27. ESTRATTORE DENTARIO ELETTROPNEUMATICO

Author

Ballistreri, F, LA ROSA, Guido, Clienti, C, Risitano, A, and Pulvirenti, G.

Subjects
ESTRATTORE DENTARIO, PINZE ODONTOIATRICHE
Published
2004

46. Design of fixed-point embedded systems (DEFIS) French ANR project.

Author

Menard, D., Rocher, R., Sentieys, O., Simon, N., Didier, L-S., Hilaire, T., Lopez, B., Goubault, E., Putot, S., Vedrine, F., Najahi, A., Revy, G., Fangain, L., Samoyeau, C., Lemonnier, F., and Clienti, C.

Abstract

Embedded applications are usually coming with stringent constraints in term of cost, energy consumption and realtime. Consequently, fixed-point arithmetic is mainstream for their implementation into embedded systems. Hence, the main objective of the french ANR project DEFIS is to provide a complete design flow for fixed-point refinement of complex applications. This tool flow is like the missing link between high-level application specification tools and low-level implementation. [ABSTRACT FROM PUBLISHER]

Published
2012

47. Endothelin-1 released by vascular smooth muscle cells enhances vascular responsiveness of rat mesenteric arterial bed exposed to high perfusion flow

Author

Vittorio E. Andreucci, Francesco A. Savino, Roberto Minutolo, Carmela Iodice, Luca De Nicola, Carla Clienti, Domenico Russo, Russo, D, Minutolo, R, Clienti, C, DE NICOLA, L, Iodice, C, Savino, Fa, Andreucci, VITTORIO EMANUELE, Minutolo, Roberto, DE NICOLA, Luca, and Andreucci, Ve

Subjects
Endothelin Receptor Antagonists, medicine.medical_specialty, Vascular smooth muscle, Endothelium, Vasodilation, Endothelin-Converting Enzymes, In Vitro Techniques, Muscle, Smooth, Vascular, Potassium Chloride, Rats, Sprague-Dawley, Norepinephrine, chemistry.chemical_compound, Internal medicine, Pressure, Internal Medicine, medicine, Animals, Aspartic Acid Endopeptidases, Vasoconstrictor Agents, Protease Inhibitors, Cyclic GMP, Mesenteric arteries, Antihypertensive Agents, Endothelin-1, business.industry, Phosphoramidon, Glycopeptides, Metalloendopeptidases, Anatomy, Receptor, Endothelin A, Receptor, Endothelin B, Endothelin 1, Mesenteric Arteries, Rats, Perfusion, medicine.anatomical_structure, Endocrinology, chemistry, Vascular resistance, Vascular Resistance, Endothelin receptor, business, Blood Flow Velocity
Abstract

Vasodilation of resistance vessels ensues in response to increased perfusion flow to maintain tissue perfusion. The flow-induced vasodilation is mainly dependent on nitric oxide (NO), which also regulates vascular responsiveness to vasoconstrictors. Besides NO, however, high flow increases endothelin-1 (ET-1) production from endothelial cells. It is likely, therefore, that the interaction between NO and ET-1 may play a critical role in the control of arterial vascular tone under high perfusion flow. In this study, the vascular responsiveness (VR) to high flow rate and the role of ET-1 released by vascular smooth muscle cells (VSMC) were evaluated in isolated and in vitro-perfused mesenteric arteries (MA). MA were perfused at constant (3.5 mL/min; CPF) and increased flow rate (4.5, 5.5, 6.5 mL/min; IPF). VR was evaluated by infusing norepinephrine (NE; 5 μmol/L) and potassium chloride (KCl; 80 mmol/L). Mesenteric vascular resistance (MVR), ET-1, and cGMP release were measured under different flow rates. The role of endothelium-derived ET-1 was evaluated by perfusing MA with phosphoramidon (endothelin converting enzyme inhibitor), whereas the role of other endothelium-derived vasoactive substances was excluded by measuring VR in MA without endothelium. Finally, ETA and ETB receptor antagonists were perfused in disendothelized MA. In the IPF group of intact MA, MVR dropped ( P .05) and both ET-1 and cGMP increased in the perfusate ( P .05). VR was enhanced by high flow after NE (101 ± 9 v 56 ± 12 mm Hg in CPF, P .005) and KCl (119 ± 12 v 51 ± 10 mm Hg in CPF, P .005) and it was unaffected by either phosphoramidon or endothelium removal. On the contrary, BQ-610 abolished the flow-dependent increase in VR. No further additive effect was achieved with BQ-788. In conclusion, in MA, high flow reduces MVR and concurrently enhances VR, likely through VSMC-derived ET-1.

Published
1999
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