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Full-Text Articles in Physics
Laboratory Bounds On Electron Lorentz Violation, Brett David Altschul
Laboratory Bounds On Electron Lorentz Violation, Brett David Altschul
Faculty Publications
Violations of Lorentz boost symmetry in the electron and photon sectors can be constrained by studying several different high-energy phenomenon. Although they may not lead to the strongest bounds numerically, measurements made in terrestrial laboratories produce the most reliable results. Laboratory bounds can be based on observations of synchrotron radiation, as well as the observed absences of vacuum Cerenkov radiation. Using measurements of synchrotron energy losses at LEP and the survival of TeV photons, we place new bounds on the three electron Lorentz violation coefficients c(TJ ), at the 3 x 10-13 to 6 x 10-15 levels.
On The Feasibility Of A Timely Transition To A More Sustainable Energy Future, Micha Tomkiewicz
On The Feasibility Of A Timely Transition To A More Sustainable Energy Future, Micha Tomkiewicz
Publications and Research
The paper uses the framework of the IPAT equation, as applied to CO2 emission, to decompose the various driving forces in the global energy use. Data from recent history are superimposed on projections of SRES IPCC scenarios to determine if enough sustainable capacity can be built to prevent irreversible ecological deterioration. The conclusion from the analysis is that, in agreement with the IPCC 4th report, until about 2030 there are no large differences between a sustainable scenario and the one that resembles “business as usual”. The sharp divergence that follows stems from different estimates in population growth and in the …
Approximation Of Range In Materials As A Function Of Incident Electron Energy, Gregory Wilson, John R. Dennison
Approximation Of Range In Materials As A Function Of Incident Electron Energy, Gregory Wilson, John R. Dennison
All Physics Faculty Publications
A simple composite analytic expression has been developed to approximate the electron range in materials. The expression is applicable over more than six orders of magnitude in energy (10 MeV) and range (10-9 m to 10-2 m), with uncertainty of ≤20% for most conducting, semiconducting and insulating materials. This is accomplished by fitting data from two standard NIST databases [ESTAR for the higher energy range and the electron IMFP (inelastic mean free path) for the lower energies]. In turn, these data have been fit with well-established semi-empirical models for range and IMFP that are related to standard materials properties (e.g., …