Articoli rivista
Anno XXXIX - n.4 - ottobre/dicembre 2006 Trasformazione relativistica delle velocità
A short argument is given as to why the conventional terms ‘addition’ or ‘composition’ of velocities are not appropriate and should be replaced by ‘transformation’. A simple proof of the relativistic law is presented, based on a geometrical approach (invariance of the space-time interval) without employing Lorentz transformations. […]
Anno XXX - n.2 - aprile/giugno 1997 Trasformazione termodinamica isoterma on-line: un’occasione per discutere la realizzazione e la taratura di un trasduttore di volume
This paper presents a simple educational on-line experiment about gas (air) transformation. This experiment was performed using an intelligent serial interface (ULI) and a volume transducer designed for this purpose. The paper is divided into two parts: the first explains the design and the calibration of the volume transducer, […]
Anno XXVI - n.4 - ottobre/dicembre 1993 Trasformazioni dell’energia solare
Bonacini Prize entry, 1991-92. The article briefly describes the experiments on solar energy done by 12 year old students, and their subsequent classroom discussion. […]
Anno XXXVI - n.1 - gennaio/marzo 2003 Trasformazioni di fase nell’acciaio
Many properties of steel depend on its microcrystalline structure. By heating a steel wire it is possible to show, with a simple experiment, how its mechanical and magnetic characteristics change with phase transformation in solid state steel. […]
Anno XXIV - n.3 - luglio/settembre 1991 Trasformazioni energetiche nella catapulta romana (Scuola media statale “F. B. Busoni”, Empoli FI)
This article describes an entry to the Bonacini Annual Contest for experimental work in the school. The pupils built a model of an ancient roman catapult and measured its elastic constant and the projectile’s initial velocity. At the end the efficiency of the energy transfer was evaluated from the energy balance of the machine. […]
Anno XXIV - n.1 - gennaio/marzo 1991 Trasporto di inquinanti dal mare all’atmosfera
The bubble-breaking, droplet-ejecting mechanism is the main pathway of the mass-transport effect at water to air interface (primarily at sea-air interface, but also lake, river…). Surface-active organic material (SAOM) tends to concentrate at the water surface. The bubbles, produced primarily by breaking waves, […]
Anno XXVII - n.2 - aprile/giugno 1994 Tre programmi da computer per la junior high school.
The article describes three programs, which simulate three physical events: (1) radioactive decay, (2) the motion of a ball in a basketball game, and (3) the launching of an earth satellite. […]
Anno XXVI - n.2 - aprile/giugno 1993 Un adattatore di tensione fra lo standard americano e quello europeo
A commercial adaptor between the US and European mains standard plugs can be modified to act as a voltage transformer. No heat is produced because a reactive and not a resistive divider is used. The device is a simple example of the Ohm’s law in AC circuits. […]