다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

A fast-Fourier-transform method of topography and interferometry is proposed. By computer processing of a noncontour type of fringe pattern, automatic discrimination is achieved between elevation and depression of the object or wave-front form, which has not been possible by the fringe-contour-generation techniques. The method has advantages over moire topography and conventional fringe-contour interferometry in both accuracy and sensitivity. Unlike fringe-scanning techniques, the method is easy to apply because it uses no moving components.

Fourier-transform method of fringe-pattern analysis for computer-based topography and interferometry

We review the recent developments in the area of optical fiber grating sensors, including quasi-distributed strain sensing using Bragg gratings, systems based on chirped gratings, intragrating sensing concepts, long period-based grating sensors, fiber grating laser-based systems, and interferometric sensor systems based on grating reflectors.

Fiber grating sensors

The PASCAL Visual Object Classes Challenge

Space-Time Digital Holography enhances resolution and Field-of-View by exploiting a synthetic aperture principle. We show that reversible induced dehydration of plant cells improves the phase-contrast too, and allows observing cytoplasmic circulation from space-time digital holograms.

Improving spatial resolution, field of view and phase- contrast of plant cells under induced dehydration by space-time digital holography

New techniques for manipulating surface wettability have been recently presented and a wide variety of techniques have been developed for fabricating 3D structures of interest in the optics, photonics and nanotechnology fields. The so called soft lithography is able to transfer microscale patterns to a substrate by using an elastomeric stamp or mold, typically made of polydimethylsiloxane (PDMS). This technique allows one to develop biocompatible lab-on-chip devices for a wide variety of applications ranging from organic LED to cell and tissue engineering and biomolecular analysis.

3D lithography of polymers for micro-photonic applications

In this work is exploited the possibility to use Electronic Speckle Pattern Interferometry (ESPI) for the characterization of different tyres with particular attention to the tyres shoulder section. Tyres characterization is of fundamental importance for vehicle dynamics modelling, since they are the main responsible of vehicles dynamical behaviour and thanks to their ability to deform, they allow to drive a vehicle generating the appropriate interaction forces at the interface with the road. Their behaviour is a consequence to their very complex structure. Two different racing tyres, one for car and other for motorcycle, have been considered. The investigation has been focused at the aim to evaluate and measure the section’s components in order to get accurate information about the different layers along through the tyres shoulder section. Here we demonstrate that the different layers (rubber, nylon, steel) can be easily highlighted and identified by mean of the ESPI that, thanks to its high sensitivity, is capable to estimate the different out of plane displacement of the different layers that respond in a different way (i.e. with a different deformation) to a thermal stimulus highlighting the layers themselves. Moreover, we introduce a de-noising step in the reconstruction process: in particular we enhance the wrapped phase information by using a suitable algorithm called SPADEDH. It is important to note that the assessment about the different layers along the section is a very difficult task to obtain by visual inspection or classical microscopy. In fact, the condition of the cutted surface, or rather the strong inhomogeneity and the roughness make impossible to obtain good images especially in the shoulder area.

Tyres shoulder section characterization by means of ESPI

In this paper, the flexibility of DH is employed to analyse in a completely and no-invasive way the cell mechanics of live and unstained cell subjected to appropriate stimuli. The potentialities of DH are employed to measure all the parameters useful to understand the deformations induced by external and controlled stress in living cells.

Cell-material interaction investigated by Digital Holographic microscopy

A new and simple method is presented here for dispensing liquid nano- and pico-droplets through a non-invasive electrode-less configuration using the electric field generated by the pyroelectric effect into a dielectric crystal.

Pietro Ferraro

Papers

Improving spatial resolution, field of view and phase- contrast of plant cells under induced dehydration by space-time digital holography

3D lithography of polymers for micro-photonic applications

Tyres shoulder section characterization by means of ESPI

Cell-material interaction investigated by Digital Holographic microscopy

A Pyro-Electrohydrodynamic Nanodispenser for Biochemical Applications