1,721,171 research outputs found
La fiamma: una fucina di idee
No full textThe acquisition of knowledge proceeds through a forced passage: the experimental observation. This work deals with physical-chemical concepts related to the flame through the development of practical and thepretical activities concerning the light-matter interaction and the heat exchanges. The target is constituted by a second class of a Technological Scientific High School: introductory questionnaires, practical applications, open discussions and group projects are proposed.
Power of observation, laws extrapolation ability, experimental results elaboration are evaluated
CuxHgy: a puzzling compound
No full textThe Cu–Hg system has been re-examined focusing on the only intermediate phase. Our results are not in agreement with the accepted literature data: both decomposition temperature and composition have been discussed. The structural determination performed on a single crystal is already in progress and, although it shows a trigonal cell, the reflection conditions seem to exclude the diffraction symbol R, rejecting the space group of the structure Cu7Hg6, R3m. The existence of a small compositional range of stability has been pointed out
- …
