1,720,979 research outputs found
M Michelini, G Torzo (responsabili), Seminario sul tema: La fisica dello stato solido nella didattica
No full textUsing Peltier cell to study solid-liquid-vapour transitions and supercooling
No full textWe propose an apparatus for teaching experimental thermodynamics in
undergraduate introductory courses, using thermoelectric modules and a
real-time data acquisition system. The device may be made at low cost,
still providing an easy approach to the investigation of liquid–solid and
liquid–vapour phase transitions and of metastable states (supercooling). The
thermoelectric module (a technological evolution of the thermocouple) is by
itself an interesting subject that offers a clear example of both thermo-electric
(Seebeck effect) and electro-thermal (Peltier effect) energy transformation.
We report here some cooling/heating measurements for several liquids and
mixtures, including water, salt/water, ethanol/water and sodium acetate,
showing how to evaluate the phenomena of freezing point depression and
elevation, and how to evaluate the water latent heat
Recent developments of the RBS technique for the analysis of semiconductor nanostructures
No full textPlaying with a bulb lamp: RTL measurements and modelling
No full textThe electric, thermal and optical behaviour of an incandescent lamp was studied by a real time laboratory (RTL) apparatus, using two voltage probes and a light probe. The software STELLA was used to model the phenomena and to analyse the transient behaviour in absence of thermal equilibrium. We show how the Joule-heating effect explains the non-linear current/voltage relation and how the filament thermal capacity affects the phase lag of light peaks with respect to input power peaks
Machine for the preparation of beverages
No full textUn sistema di scambiatori termici e di celle di peltier permette di raffreddare una bevanda appena prodotta utilizzando acqua calda. La bevanda giunge nel bicchiere già raffreddata. Il sistema non ha parti in movimento, né usa gas o pompe
Comparison between gravitational and inertial mass: Two experiments with Real Time Laboratory
No full textTwo simple experiments performed with RTL (Real Time Laboratory) offer an opportunity to make clear for the students the difference between weight and mass, and between inertial and gravitational mass. The role of the hydrodynamic mass is also investigated, and various effects on the motion of different bodies due to the presence of air are discussed
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