Tag: Trapped

Free Download Self-Trapped Excitons By K. S. Song, Richard T. Williams (auth.)
1996 | 410 Pages | ISBN: 3540604464 | PDF | 12 MB
Self-Trapped Excitons discusses the structure and evolution of the self-trapped exciton (STE) in a wide range of materials. It includes a comprehensive review of experiments and extensive tables of data. Emphasis is given throughout to the unity of the basic physics underlying various manifestations of self-trapping, with the theory being developed from a localized, atomistic perspective. The topics treated in detail in relation to STE relaxation include spontaneous symmetry breaking, lattice defect formation, radiation damage, and electronic sputtering.

Free Download Optically Trapped Microspheres as Sensors of Mass and Sound: Brownian Motion as Both Signal and Noise by Logan Edward Hillberry
English | PDF EPUB (True) | 2023 | 124 Pages | ISBN : 3031443314 | 23.3 MB
This thesis makes significant advances in the use of microspheres in optical traps as highly precise sensing platforms. While optically trapped microspheres have recently proven their dominance in aqueous and vacuum environments, achieving state-of-the-art measurements of miniscule forces and torques, their sensitivity to perturbations in air has remained relatively unexplored. This thesis shows that, by uniquely operating in air and measuring its thermally-fluctuating instantaneous velocity, an optically trapped microsphere is an ultra-sensitive probe of both mass and sound. The mass of the microsphere is determined with similar accuracy to competitive methods but in a fraction of the measurement time and all while maintaining thermal equilibrium, unlike alternative methods. As an acoustic transducer, the air-based microsphere is uniquely sensitive to the velocity of sound, as opposed to the pressure measured by a traditional microphone. By comparison to state-of-the-art commercially-available velocity and pressure sensors, including the world’s smallest measurement microphone, the microsphere sensing modality is shown to be both accurate and to have superior sensitivity at high frequencies. Applications for such high-frequency acoustic sensing include dosage monitoring in proton therapy for cancer and event discrimination in bubble chamber searches for dark matter. In addition to reporting these scientific results, the thesis is pedagogically organized to present the relevant history, theory, and technology in a straightforward way.

Free Download Optically Trapped Microspheres as Sensors of Mass and Sound: Brownian Motion as Both Signal and Noise by Logan Edward Hillberry
English | PDF EPUB (True) | 2023 | 124 Pages | ISBN : 3031443314 | 23.3 MB
This thesis makes significant advances in the use of microspheres in optical traps as highly precise sensing platforms. While optically trapped microspheres have recently proven their dominance in aqueous and vacuum environments, achieving state-of-the-art measurements of miniscule forces and torques, their sensitivity to perturbations in air has remained relatively unexplored. This thesis shows that, by uniquely operating in air and measuring its thermally-fluctuating instantaneous velocity, an optically trapped microsphere is an ultra-sensitive probe of both mass and sound. The mass of the microsphere is determined with similar accuracy to competitive methods but in a fraction of the measurement time and all while maintaining thermal equilibrium, unlike alternative methods. As an acoustic transducer, the air-based microsphere is uniquely sensitive to the velocity of sound, as opposed to the pressure measured by a traditional microphone. By comparison to state-of-the-art commercially-available velocity and pressure sensors, including the world’s smallest measurement microphone, the microsphere sensing modality is shown to be both accurate and to have superior sensitivity at high frequencies. Applications for such high-frequency acoustic sensing include dosage monitoring in proton therapy for cancer and event discrimination in bubble chamber searches for dark matter. In addition to reporting these scientific results, the thesis is pedagogically organized to present the relevant history, theory, and technology in a straightforward way.

Free Download Soldiers and Slaves: American POWs Trapped by the Nazis’ Final Gamble (Audiobook)
English | ASIN: B0009RFWPW | 2005 | 11 hours and 20 minutes | M4B@128 kbps | 618 MB
Author: Roger Cohen
Narrator: Michael Prichard
In February 1945, 350 American POWs captured earlier at the Battle of the Bulge or elsewhere in Europe were singled out by the Nazis because they were Jews or were thought to resemble Jews. They were transported in cattle cars to Berga, a concentration camp in eastern Germany, and put to work as slave laborers, mining tunnels for a planned underground synthetic-fuel factory. This was the only incident of its kind during World War II. Starved and brutalized, the GIs were denied their rights as prisoners of war, their ordeal culminating in a death march that was halted by liberation near the Czech border. Twenty percent of these soldiers, more than 70 of them, perished.