1,721,212 research outputs found
Experimental preventive protocols for bronj: three years of clinical experienceSalgarello S, Di Rosario F, Stranieri F, Cocco V, Dalessandri D, Paganelli C
No full textInfluence of dipping time on cracking during bending of hot dip galvanized coatings with Sn and Ti contents
No full textIn the last years, the attention to environmental topics led a new approach solution in classical protection techniques, introducing innovative way oriented to optimize different coating properties. Hot-dip galvanizing is a classical process aimed to generate coatings on iron-based surfaces, used unchanged since 200 years: some chemical elements are added in the bath with different aims (e.g., Pb is really important for its
fluidizing properties, sometimes replaced by Sn) but sometimes these elements are dangerous for human health (e.g . . .. Pb!).
In this work, the influence of dipping time and coatings chemical compositions on damaging micromechanisms was investigated considering different Sn and Ti contents. Main damaging micromechanisms in hot dip zinc coated ipersandelin steel specimens were investigated by means of bending tests. Longitudinal sections of bended specimens were observed by means of a LOM (Light Optical Microscope): main damage micromechanisms were identifìed as longitudinal and radial cracks
High yield design of MMIC transimpedance amplifiers for multigigabit optical transmission systems
Full text linkIn this paper we present a design methodology for optical receivers based on transimpedance gain stage which reduces the receiver performance sensitivity to the photodiode parameter set. A transimpedance amplifier has been designed following this approach and experimental results are reported which show an improvement in the overall yield of the receiver. The design methodology proposed here has been easily implemented in a microwave simulator
A new design approach for monolithic transimpedance receivers based on root-locus techniques
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Prove di flessione non tradizionali su acciai zincati. Caratterizzazione cinematica e statica del meccanismo ed identificazione dello stato di danneggiamento del rivestimenti
Full text linkThe aim of this work was the analysis of the hot dip zinc coated steel plates mechanical properties by means of a non-tradition bending test performed minimizing both the bending moment differences along the bending axis and the interactions between the clamping system and the specimen coating. A complete kinematic and static mechainism analysis was performed. All the kinematic and static variables were identified in order to completely characterise the specimen deformation mechanism and the stress level. Bending tests were performed both on non-coated and on hot dip zinc coated plates, correlating the measured varia bles (applied load and crosshead displacement) with the bending moment and the specimen bending angle. Tests are characterised by a good repeatability. Results show a crosshead displacement - load diagrams that depend on the main deformation mechanisms. Furthermore, the mechanical behaviour was influenced by the coating thickness. It can be seen throught the load values increase and the crosshead displacement - load diagram modification. For all the investigated coating conditions, radial cracks are observed. They initiate corresponding to the F phase and propagate up to the ζ-η interface. The coating thickness increase implies both an increase of the importance of the cracks in δ and ζ phases and the presence of cracks at ζ-δ interfaces. As a consequence, the increase of coating thickness implies an increase of the susceptibility to a coating-steel debonding damage mechanism, with a consequent loose of the coating adhesion and a decreasing of the capability of the zinc coating to improve the steel corrosion resistance
A comparison among GaAs monolithic processes with respect to the requirements of transimpedance amplifiers using root-locus techniques
No full textStructural transition under uniaxial deformation in a NiTi pseudo-elastic alloy
No full textNiTi shape memory alloys (SMAs) are increasingly used in many engineering and medical
applications, because they combine special functional properties, such as shape memory effect and pseudoelasticity,
with good mechanical strength and biocompatibility. However, the microstructural changes associated
with these functional properties are not yet completely known. In this work a NiTi pseudo-elastic alloy was
investigated by means of X-ray diffraction in order to assess micro-structural transformations under mechanical
uniaxial deformation. The results have been compared with those obtained after complete shape recovery
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