1,721,010 research outputs found
Determination of the concentrations of interferents in blood serum by use of a novel solid-state colorimeter
No full textThe quality of the clinical-chemistry analysis of blood serum is greatly affected by interfering substances contained in the sample. At present, skilled laboratory personnel select specimens which can be processed by the analyser. Selection is performed by visual inspection of the serum colour. To reduce laboratory labour costs and risk of infections, we developed an inexpensive, simple and compact solid-state colorimeter to determine concentrations of interferents. This sensor can be integrated into modern clinical-chemistry analysers. The determination of concentrations of interferents is based on the measurement of the extinction coefficients of the serum sample at four different wavelengths. In this paper, this instrument and its performance are presented
Refractive properties of interfaces due to the use of vitreous substitutes in vitreoretinal surgery: a ray tracing approach. Part 2: Endo-ocular laser photocoagulation
No full textAutofluorescence Methods in Ophthalmology
Full text linkAbstract. An overview of the fluorophores of the eye, the methods
used to measure ocular fluorescence, and the existing or ready-tomarket
instrumentation for the early diagnosis and monitoring of ophthalmic
pathologies is presented. Emphasis is given to the impact that
a more detailed knowledge of the fluorophores of the eye, their age
and pathology relationship, and the considerable technology-driven
progress in optical devices and components has had on the development
of new compact yet powerful instruments for population screening
and for patient follow-ups, using fluorometry alone or in combination
with other optical techniques such as light scattering
Refractive properties of interfaces due to the use of vitreous substitutes in vitreoretinal surgery: a ray tracing approach. Part 1: Transpupillary laser photocoagulation.
No full textRefractive properties of interfaces due to the use of vitreous substitutes in vitreoretinal surgery: a ray tracing approach. Part 3: Modelling the effect of an air bubble within the irradiation path in endo-ocular laser photocoagulation.
No full textDesign and performance of a low-coherence sensor for industrial applications based on a self-mixing superluminescent diode
No full textIn this paper a novel low-coherence sensor based on a self- mixing super-luminescent diode (SM-SLD) is described. A commercial low-cost super-luminescent diodes (SLD) driven at constant current is used as low-coherence source. In the same case of the SLD there is a photodiode generally used to monitor the optical power at the emitting junction back-face. In the SM-SLD technique, this photodiode is exploited to detect the interference signal. Hence, the interference signal is optically amplified by the high-gain active medium. The sensor has been properly designed to work in industrial environments and is suitable for measurement of semitransparent slabs thickness, i.e. glass, Plexiglas, polyethylene, etc. Measurements carried out on glass slabs show a measuring range of 15 mm and a linearity error and stability of 1.3 micrometer and 1.6 micrometer respectively
A ray tracing approach to model the refractive properties of interfaces due to the use of vitreous substitutes in vitreoretinal surgery
No full text
Interfaccia cyberfisica uomo-macchina basata su Deep Learning
Full text linkIl paradigma Industria 4.0 introduce il concetto di “smart factory", ovvero l'interconnessione tra sistemi informatici e sistemi fisici (detti sistemi cyberfisici). In particolare, questo lavoro di ricerca si focalizza sul concetto di "smart production", basato su una concreta collaborazione tra macchine, strumenti ed operatori per mezzo di supporti informatici. In questo senso, le workstation meta-collaborative risultano essere di particolare interesse, perché a differenza delle workstation collaborative classiche lo spazio di lavoro dell'operatore e del robot non è necessariamente condiviso e la cooperazione può avvenire a prescindere dalla presenza di barriere fisiche tra i due. In questo lavoro di ricerca si prosegue l’indagine presentata precedentemente riguardante le potenzialità dei sistemi intelligenti basati su Deep Learning come strumento di interfaccia cyberfisica tra umano e macchina, inserendo un modello allenato ad hoc su dei gesti prescelti all’interno di una interfaccia di comando basata su ROS
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