1,721,007 research outputs found
Integrity assessment of pipeline systems by an enhanced indentation technique
Full text linkA non-destructive technique based on indentation and enhanced by the consideration of the imprint mapping is proposed for the diagnostic analysis of pipelines in oil transportation systems. The considered testing procedure can be applied in the field without the need of extracting spools and working out the specimens required by more traditional experimental approaches. The reliability of the presented methodology is verified by investigating a pipe segment with more than 25 years of service. The mechanical properties determined by indentation and imprint mapping compare well with the output of standard tensile tests in average terms while better insight on the spatial distribution of the material characteristics is achieved
Simulazione numerica di risuonatori laser instabili
No full textPresentazione di un codice di propagazione pseudo-spettrale per la modellistica di risuonatori laser
Resistenza alla Propagazione di Cricche per l’Acciaio da Vessel Nucleare in Ambiente LWR
No full text
Fracture of corrosion protecting layers: investigation by indentation test
No full textThe mechanical properties of protective coatings produced by corrosion on the internal surfaces of pipelines transporting hydrocarbons have been investigated by indentation tests, which have revealed the spall or cracking attitude of the film. The role of material properties controlling the coating integrity and the main damaging mechanisms have been identified with the aid of the numerical simulation of the experiment
The effect of transverse multi-mode oscillation in passively mode-locked solid-state lasers
No full textIt is shown that the time-varying spatial pattern determined by the multimode beam in the saturable absorber leads to less effective bleaching and mode-locking. This demonstrates the need for high beam quality for effective mode-locking in solid state lasers
Measurement of the third order electronic susceptibility of LNA crystals
No full textThe third-order susceptibility of lanthanum-neodymium hexa-aluminate (LNA) crystals has been measured by the z-scan technique to be (0.13±0.02)×10−13 esu. Thermal contributions are estimated to be two orders of magnitude lower than the measured value. The nonlinearity is believed to be due to bound electronic effects, and the linear absorption spectrum of LNA supports the interpretation of a nonresonant nonlinear refractivity casual consequence of two-photon absorption
Mechanical and surface analysis of the composite materials degradation in low Earth orbit environment
No full textIntegrity of Pipelines Transporting Hydrocarbons
No full textThis book describes technical and practical aspects of pipeline damage. It summarizes the phenomena, mechanisms and management of pipeline corrosion in-service. The topics discussed include pipelines fracture mechanics, damage mechanisms and evolution, and pipeline integrity assessment. The concept of acceptable risk is also elucidated and the future application of new knowledge management tools is considered
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