Quantum Revivals in a Periodically Driven Gravitational Cavity

Quantum revivals are investigated for the dynamics of an atom in a driven gravitational cavity. It is demonstrated that the external driving field influences the revival time significantly. Analytical expressions are presented which are based on second order perturbation theory and semiclassical secular theory. These analytical results explain the dependence of the revival time on the characteristic parameters of the problem quantitatively in a simple way. They are in excellent agreement with numerical results

Non-invasive biophysical measurement of travelling waves in the insect inner ear

Frequency analysis in the mammalian cochlea depends on the propagation of frequency information in the form of a travelling wave (TW) across tonotopically arranged auditory sensilla. TWs have been directly observed in the basilar papilla of birds and the ears of bush-crickets (Insecta: Orthoptera) and have also been indirectly inferred in the hearing organs of some reptiles and frogs. Existing experimental approaches to measure TW function in tetrapods and bushcrickets are inherently invasive, compromising the fine-scale mechanics of each system. Located in the forelegs, the bushcricket ear exhibits outer, middle and inner components; the inner ear containing tonotopically arranged auditory sensilla within a fluid-filled cavity, and externally protected by the leg cuticle. Here, we report bush-crickets with transparent ear cuticles as potential model species for direct, non-invasive measuring of TWs and tonotopy. Using laser Doppler vibrometry and spectroscopy, we show that increased transmittance of light through the ear cuticle allows for effective non-invasive measurements of TWs and frequency mapping. More transparent cuticles allow several properties of TWs to be precisely recovered and measured in vivo from intact specimens. Our approach provides an innovative, noninvasive alternative to measure the natural motion of the sensillia-bearing surface embedded in the intact inner ear fluid

High Spatial Resolution Fast-Neutron Imaging Detectors for Pulsed Fast-Neutron Transmission Spectroscopy

Two generations of a novel detector for high-resolution transmission imaging and spectrometry of fast-neutrons are presented. These devices are based on a hydrogenous fiber scintillator screen and single- or multiple-gated intensified camera systems (ICCD). This detector is designed for energy-selective neutron radiography with nanosecond-pulsed broad-energy (1 - 10 MeV) neutron beams. Utilizing the Time-of-Flight (TOF) method, such a detector is capable of simultaneously capturing several images, each at a different neutron energy (TOF). In addition, a gamma-ray image can also be simultaneously registered, allowing combined neutron/gamma inspection of objects. This permits combining the sensitivity of the fast-neutron resonance method to low-Z elements with that of gamma radiography to high-Z materials.Comment: Also published in JINST: http://www.iop.org/EJ/abstract/1748-0221/4/05/P0501

EON, Vol. 04, No. 01

Winter 2016 News and notes from the University of Dayton Electro-Optics Graduate Program.https://ecommons.udayton.edu/eop_newsletter/1008/thumbnail.jp

EON, Vol. 01, No. 01

Fall 2012 News and notes from the University of Dayton Electro-Optics Graduate Program.https://ecommons.udayton.edu/eop_newsletter/1002/thumbnail.jp

EON, Vol. 02, No. 02

Spring 2014 News and notes from the University of Dayton Electro-Optics Graduate Program.https://ecommons.udayton.edu/eop_newsletter/1005/thumbnail.jp

EON, Vol. 03, No. 01

Winter 2015 News and notes from the University of Dayton Electro-Optics Graduate Program.https://ecommons.udayton.edu/eop_newsletter/1006/thumbnail.jp

EON, Vol. 05, No. 01

Winter 2019 News and notes from the University of Dayton Electro-Optics Department.https://ecommons.udayton.edu/eop_newsletter/1011/thumbnail.jp