1,355 research outputs found
Science and society-M.Curie/N.Bohr
No full textUgo Amaldi introduit le conférencier du soir, Pierre Radvanyi; le thème de cette conférence est: Marie Curie, Niels Bohr and Science Society- Problems of their tim
On 23 March ESA’s third Automated Transfer Vehicle (ATV), named in honour of Amaldi, was launched on board an Ariane rocket.
No full textLive webcast from CERN on the occasion of the launch of a "Space Ferry", named after Edoardo Amaldi, by the European Space Agency (ESA). Amaldi was CERN's first Secretary General and founding father, and a visionary pioneer for ESA. With the participation of Ugo Amaldi, CERN physicist and son of Edoardo Amaldi, Carlo Rubbia, Nobel Laureate in Physics and Former Director General of CERN and Arturo Russo, historian and author with John Kriege of CERN and ESA's Histor
Aspetti variazionali della meccanica II
No full textSi introducono dei moderni elementi di calcolo delle Variazioni accanto alla riedizione del trattato classico di Levi Civita e Amald
Aspetti variazionali della meccanica I
No full textIn questo nostro contributo alla riedizione delle classiche Lezioni di Levi-Civita e Amaldi vogliamo esporre alcuni argomenti che sono in comune fra le discipline della Meccanica e del Calcolo delle Variazioni, argomenti che le Lezioni non menzionano del tutto (teorema di Noether) o relegano a poche righe (teorema locale di minima azione). Riteniamo inoltre utile trattare altri argomenti con un linguaggio che unifichi la Meccanica e il Calcolo delle Variazioni (principio di Hamilton, geodetiche)
Correlation between chromosome damage and cells killing in mammalian cells exposed to photons or hadrons
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High gradient test of a 3 GHz single-cell cavity
No full textProton and carbon ion beams present advantageous depth-dose distributions with respect to X-rays. Carbon ions allow a better control of "radioresistant" tumours due to their higher biological response. For deep-seated tumours proton and carbon ion beams of some nA and energies of about 200 MeV and 400 MeV/u respectively are needed. For these applications TERA proposed the "cyclinac": a high-frequency linac which boosts the hadrons accelerated by a cyclotron. The dimensions of the complex can be reduced if higher accelerating gradients are achieved in the linac. To test the maximum achievable fields, a 3 GHz cavity has been built by TERA. The 19 mm-long cell is foreseen to be excited at 200 Hz by 3 us RF pulses and should reach a 40 MV/m accelerating gradient, which corresponds to a peak surface electric field Es of 260 MV/m. In a first high-power test performed at CTF3 the cell was operated at 50 Hz with a maximum peak power of 1 MW. The maximum Es achieved was above 350 MV/m. The breakdown rate at these field values was around 10-1 bpp/m. The maximum value of the modified Poynting vector is close to the best values achieved by high gradient structures at 12 and 30 GHz
Le traiettorie della fisica. Con e-book. Con espansione online. Per le Scuole superiori. Vol. 1: Meccanica
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