arXiv subjects

Luigi Foschini

Publications and source records attributed to Luigi Foschini.

61 records · Page 4Linked to original sources

arXiv2000

Leonid Electrophonic Bursters

We investigate the conditions under which Leonid meteoroids might generate short duration (burster) electrophonic sounds. A `first order' theory is employed to estimate the approximate electron number density in the meteoroid ablation column as a function of time. Using the threshold conditions discussed in an earlier communication (Beech and Foschini 1999) we find that Leonid meteoroids more massive than about 0.1 kg can potentially generate short duration electrophonic bursters.

astro-ph↗

arXiv2000

The impact hazard from small asteroids: current problems and open questions

The current philosophy of impact hazard considers the danger from small asteroids negligible. However, several facts claim for a revision of this philosophy. In this paper, some of these facts are reviewed and discussed. It is worth noting that while the impact frequency of Tunguska-like objects seems to be higher than previously estimated, the atmospheric fragmentation is more efficient than commonly thought. Indeed, data recorded from airbursts show that small asteroids breakup at dynamical pressures lower than their mechanical strength. This means that theoretical models are inconsistent with observations and new models and data are required in order to understand the phenomena.

astro-ph↗

arXiv2000

The "fingers" of the physics

The passage of particles through matter is one of the principal ways to investigate nature. In this article, we would like to outline the most important stages in the development of the theory about the stopping power.

physics.hist-ph↗

arXiv1999

Questions on the concept of time

Some notes and questions about the concept of time are exposed. Particular reference is given to the problem in quantum mechanics, in connection with the indeterminacy principle.

quant-ph↗

arXiv1999

The meteoroid hazard for space navigation

Thanks to post-flight analyses of several artificial satellites carried out during last years, the meteoroids hazard for space navigation and in-orbit satellites permanence is now clear. Even if catastrophic impact is a rare event, high meteoroids fluxes can erode and weaken the satellite or space station main structures. However, the main danger seems to be the impact-generated plasma, which can produce electromagnetic interferences, disturbing the on-board electronics.

physics.space-ph↗

arXiv1998

Short range gravitational fields: Rise and fall of the fifth force

During the 80's, some experiments and the repetitions of old ones, lead to the hypothesis of a fifth force. Nevertheless, a more accurate research was not able to confirm this hypothesis. This article wants to go over again the most important steps of the event.

physics.hist-ph↗

arXiv1998

Is Science going through a critical stage?

The unexpected discoveries at the beginning of the century, particularly thanks to Heisenberg, Bohr, and Godel, has driven the science to drastic changes, opening new, extraordinary, and infinite research fields. After this, many scientists saw, and still today see, a crisis, with dreadful meaning, in the science. However, this crisis is only present in that type of science, driven by determinism, which is strictly linked to the common sense.

physics.hist-ph↗