Doppler_Toolbox

The Doppler Shift is defined as a change in pitch as a result of relative motion between a sound source and a receiver. As the source and receiver become closer together the sound waves arrive at closer intervals, and thus the receiver perceives a higher pitch than the original emitted frequency. As the source moves further away the receiver hears a lower frequency than what was emitted. The relative velocity also produces a change in magnitude (Nave 2012). The Doppler Shift occurs between ANY sound source and receiver when there is relative motion. It is most noticeable when a plane flies overhead or an ambulance drives passed, however the Doppler Shift is always occurring, giving important auditory cues that allow us to so accurately and usually subconsciously, localize sound. This principle forms the basis of many spatial related technologies, such as sonar, radar and acoustic mapping. Thus, it is of the utmost importance for anyone studying engineering, science, audio or acoustics to be aware of, and understand the Doppler Shift. The computer program Matlab is used extensively by university students and professionals in these fields for coding purposes. The software includes many in-built functions for performing calculations, but none of the in-built functions address the doppler shift. I believe the addition of a “Doppler Toolbox” would be a very effective and usable addition to the software for future releases. This submission includes four functions - POLICE_RADAR, DOPPLER_APPROACHING, DOPPLER_RECEDING & DOPPLER_PASSING. They can all be run using the script Doppler_Toolbox_script

Learning to Teach in a Pandemic: Qualities Contributing to Success

Despite facing challenges, my pre-service teachers successfully navigated student teaching during the COVID-19 pandemic. Three qualities stood out that seemed to contribute to their success in the distance learning context: care for students, flexibility, and passion for the profession

Reconciliation without violence

Is it possible to solve conflicts without using violence, or is the use of violent retribution necessary to solve problems and restore peace after serious crimes and offences? This is a classical question in the philosophy of law and in all the disciplines dealing with conflict resolution. It is also an important question in theology. The material for this article comes from interviews with sons who have grown up with violent fathers, and from philosophical and theological texts dealing with the theme of conflict resolution. In contemporary theology it is necessary to confront images of God as a violent patriarch and punisher, but still it is important to develop a theology of God as the fair and good judge. The God of reconciliation is not only the forgiver, but also the one who confronts Evil with wrath and resentment

Vibrationally induced fourth-order magnetic anisotropy and tunnel splittings in Mn_{12}

From density-functional-theory (DFT) based methods we calculate the vibrational spectrum of the Mn_{12}O_{12}(COOH)_{16}(H_2 O)_4 molecular magnet. Calculated infrared intensities are in accord with experimental studies. There have been no ab initio attempts at determining which interactions account for the fourth-order anisotropy. We show that vibrationally induced distortions of the molecule contribute to the fourth-order anisotropy Hamiltonian and that the magnitude and sign of the effect (-6.2 K) is in good agreement with all experiments. Vibrationally induced tunnel splittings in isotopically pure and natural samples are predicted.Comment: corres. author: [email protected] 4 pages, final version, accepted PR

CFD education - Past, present, future

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/77217/1/AIAA-1999-910-203.pd