January 26th, 2021

лошадь, диаграмма, Фейнман

Очередное педагогическое упражнение насчет того, как вытянуть всю электродинамику из электростатики

How to get from static to dynamic electromagnetism: https://arxiv.org/abs/2101.10111
Jürgen König
We demonstrate how to derive Maxwell's equations, including Faraday's law and Maxwell's correction to Ampère's law, by generalizing the description of static electromagnetism to dynamical situations. Thereby, Faraday's law is introduced as a consequence of the relativity principle rather than an experimental fact, in contrast to the historical course and common textbook presentations. As a by-product, this procedure yields explicit expressions for the infinitesimal Lorentz and, upon integration, the finite Lorentz transformation. The proposed approach helps to elucidate the relation between Galilei and Lorentz transformations and provides an alternative derivation of the Lorentz transformation without explicitly referring to the speed of light.
Comments: 20 pages
лошадь, диаграмма, Фейнман

Детекторы для медицинских и других приложений

From nuclear physics to applications: detectors for beam handling, medical diagnostics and radioactive waste monitoring: https://arxiv.org/abs/2101.10207
Paolo Finocchiaro
Nuclear physics experiments are always in need of more and more advanced detection systems. During the last years relevant technological developments have come out with many improvements in terms of performance and compactness of detector materials, transducers, electronics, computing and data transmission. In light of these achievements some applications previously prohibitive, mainly because of size and cost, have become feasible. A few applications of nuclear detection techniques are discussed, starting from the neighboring field of particle beam diagnostics, moving to the medical diagnostics and ending up into the radioactive waste handling. New radiation sensors are shown and explained, as exploited in the DMNR project for the radioactive waste online monitoring which merged into the MICADO Euratom project.
Comments: 27 pages, 33 figures