Non-Isochronous Meter: A Study of Cross cultural practice, analytic technique, and implications for jazz pedagogy

This dissertation examines the use of non-isochronous (NI) meters in jazz compositional and performative practices (meters as comprised of cycles of a prime number [e.g., 5, 7, 11] or uneven divisions of non-prime cycles [e.g., 9 divided as 2+2+2+3]). The explorative meter practices of jazz, while constituting a central role in the construction of its own identity, remains curiously absent from jazz scholarship. The conjunct research broadly examines NI meters and the various processes/strategies and systems utilized in historical and current jazz composition and performance practices. While a considerable amount of NI meter composers have advertantly drawn from the metric practices of non-Western music traditions, the potential for utilizing insights gleaned from contemporary music-theoretical discussions of meter have yet to fully emerge as a complimentary and/or organizational schemata within jazz pedagogy and discourse. This paper seeks to address this divide, but not before an accurate picture of historical meter practice is assessed, largely as a means for contextualizing developments within historical and contemporary practice and discourse. The dissertation presents a chronology of explorative meter developments in jazz, firstly, by tracing compositional output, and secondly, by establishing the relevant sources within conjunct periods of development i.e., scholarly works, relative academic developments, and tractable world music sources. Bridging the gap between world music meter sources and theoretical musicology (primarily, the underlying perceptual and cognitive model which represents a topology of the structural premises of meter) the research acts to direct and inform a compositional process which directly accounts for an isomorphic link between structurally similar meters

The First Moments of Nucleon Generalized Parton Distributions

We extrapolate the first moments of the generalized parton distributions using heavy baryon chiral perturbation theory. The calculation is based on the one loop level with the finite range regularization. The description of the lattice data is satisfactory and the extrapolated moments at physical pion mass are consistent with the results obtained with dimensional regularization, although the extrapolation in the momentum transfer to $t=0$ does show sensitivity to form factor effects which lie outside the realm of chiral perturbation theory. We discuss the significance of the results in the light of modern experiments as well as QCD inspired models.Comment: 14 pages, 9 figure

Simulations of a Scintillator Compton Gamma Imager for Safety and Security

We are designing an all-scintillator Compton gamma imager for use in security investigations and remediation actions involving radioactive threat material. To satisfy requirements for a rugged and portable instrument, we have chosen solid scintillator for the active volumes of both the scatter and absorber detectors. Using the BEAMnrc/EGSnrc Monte Carlo simulation package, we have constructed models using four different materials for the scatter detector: LaBr_3, NaI, CaF_2 and PVT. We have compared the detector performances using angular resolution, efficiency, and image resolution. We find that while PVT provides worse performance than that of the detectors based entirely on inorganic scintillators, all of the materials investigated for the scatter detector have the potential to provide performance adequate for our purposes.Comment: Revised text and figures, Presented at SORMA West 2008, Published in IEEE Transactions on Nuclear Scienc

Double deeply virtual Compton scattering off the nucleon

We study the double deeply virtual Compton scattering (DDVCS) process off the nucleon, through the scattering of a spacelike virtual photon with large virtuality resulting in the production of a timelike virtual photon, decaying into an e^+ e^- pair. This process is expressed in the Bjorken regime in terms of generalized parton distributions (GPDs) and it is shown that by varying the invariant mass of the lepton pair, one can directly extract the GPDs from the observables. We give predictions for the DDVCS cross section and beam helicity asymmetry and discuss its experimental feasibility.Comment: 4 pages, 4 figure

DVCS amplitude with kinematical twist-3 terms

We compute the amplitude of deeply virtual Compton scattering (DVCS) using the calculus of QCD string operators in coordinate representation. To restore the electromagnetic gauge invariance (transversality) of the twist-2 amplitude we include the operators of twist-3 which appear as total derivatives of twist-2 operators. Our results are equivalent to a Wandzura-Wilczek approximation for twist-3 skewed parton distributions. We find that this approximation gives a finite result for the amplitude of a longitudinally polarized virtual photon, while the amplitude for transverse polarization is divergent, i.e., factorization breaks down in this term. However, the divergent part has zero projection onto the polarization vector of the final real photon.Comment: 8 pages, Latex; discussion of singularities correcte

The detection of Atlantic cod (Gadus morhua) using loop mediated isothermal amplification in conjunction with a simplified DNA extraction process

Atlantic cod (Gadus morhua) is a commercially important species of white fish, and one of three species legally identifiable as cod in the UK. Mislabelling of G. morhua does occur, as does the substitution of G. morhua for less expensive species. Sensitive molecular tests based on PCR have been developed for this species, but they have limitations, including the need for expensive thermal cycling equipment, and complex DNA extraction procedures. A loop mediated isothermal amplification (LAMP) assay was designed for the G. morhua cytochrome b gene, which was capable of detecting 0.1% w/w G. morhua in a homogenised raw fish mix. The LAMP assay was also able to detect G. morhua DNA when a rapid sample preparation was used, involving heating 100 mg of fish in a 1 ml aliquot of water and testing the supernatant, showing a higher tolerance of amplification inhibitors than a PCR assay. The LAMP assay did not generate a positive result when challenged with a range of non-target species, including Gadus macrocephalus, and Gadus chalcogrammus, indicating a high level of specificity. Direct detection of a positive reaction using propidium iodide was also demonstrated

Some aspects of chemical energy in geology

Thesis. (Ph.D.) Massachusetts Institute of Technology. Dept. of Geology, 1952.Vita.Bibliography: leaves 155-162.by Vincent Alexander Saull.Ph.D