Aviation depot level repairable system gains

The purpose of this thesis is to analyze the aviation repairable system gains monitored under the UICP B35 carcass tracking program. It examines the composition of the system gains for selected activities and by aircraft type. Research was conducted on repairable turn-in procedures from the activity level to the carcass tracking program via the ATAC Hub. Emphasis was placed on identifying areas which would enable better retrograde management within the Inventory Control Point, at the activity level, and at the ATAC Hub. Seven areas were identified which offer potential repairable management improvement. Recommendations are provided which would assist in minimizing system gains and more accurately reflect the overall value of excess material.http://archive.org/details/aviationdepotlev1094527648Lieutenant Commander, United States NavyLieutenant, United States NavyApproved for public release; distribution is unlimited

Spectral cutoffs in indirect dark matter searches

Indirect searches for dark matter annihilation or decay products in the cosmic-ray spectrum are plagued by the question of how to disentangle a dark matter signal from the omnipresent astrophysical background. One of the practically background-free smoking-gun signatures for dark matter would be the observation of a sharp cutoff or a pronounced bump in the gamma-ray energy spectrum. Such features are generically produced in many dark matter models by internal Bremsstrahlung, and they can be treated in a similar manner as the traditionally looked-for gamma-ray lines. Here, we discuss prospects for seeing such features with present and future Atmospheric Cherenkov Telescopes.Comment: 4 pages, 2 figures, 1 table; conference proceedings for TAUP 2011, Munich 5-9 Se

Cooking and lighting habits in rural Nepal and Uganda

Nearly a quarter of the world’s population has no access to electricity and nearly half cook with biomass or coal. Over the past 30 years there have been several initiatives to design and introduce appropriate, renewable energy technologies for household energy supply. However, few of these have been successful in terms of significant penetration and long term sustainability. A new initiative, the SCORE project, was launched in 2007 with the objective of producing a clean biomass cook stove which also incorporates a thermo-acoustic engine which converts some of the heat into electricity. It was vital to determine the technical requirements of this new device as a pre-requisite to engineering development particularly in the two candidate countries where this new technology was to be trialled: Nepal and Uganda. Accurate data could not be sourced in the open literature and therefore studies were commissioned in order to obtain the relevant data. The data obtained is of significant value for any development projects involving the provision of small-scale off-grid electrical power and heat for cooking

Postscript: Queer Endings/Queer Beginnings

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TUNNELING REACTIONS OF HYDROGEN ADDITION TO PROPENE IN A SOLID PARA-HYDROGEN MATRIX

We report the branching ratio for the H + propene tunneling reaction to form \textit{n}- or \textit{i}-propyl radicals within a solid \textit{para}-hydrogen (\textit{p}-\chem{H_2}) matrix at 3.2 K. Chlorine and propene are co-deposited in the \textit{p}-\chem{H_2} matrix, and then 365 nm and infrared light sources are used to produce HCl and free H atoms. These free H atoms can tunnel through the matrix until they encounter a propene molecule, at which point they can react to form either an \textit{n}-propyl or an \textit{i}-propyl radical. \textit{i}-Propyl was produced in greater proportion than \textit{n}-propyl, indicating that for hydrogen addition to the double bond, the rate of addition to the terminal carbon (\textit{i}-propyl) is faster than the rate of addition to the center carbon (\textit{n}-propyl). Because the barriers for addition are approximately 700 cm$^{-1}$ – 1500 cm$^{-1}$ (1000 K – 2000 K), the only available mechanism for reaction in the \textit{p}-\chem{H_2} matrix (3.2 K) is tunneling. \textit{Ab initio} calculations were used to compute the tunneling probabilities for the formation of the \textit{n}-propyl and \textit{i}-propyl radicals. The rate of addition to the terminal carbon (\textit{i}-propyl) was calculated to be faster, in agreement with experiment

Adaptation of Australian houses and households to future heat waves

Climate change predictions indicate more extremes in weather conditions in the coming decades with more frequent and severe heat waves in certain locations including Australia. It is likely that the more vulnerable members of the community will be at risk during heat waves in the future from both health and financial perspectives. The trend towards fully air conditioned larger homes has already seen very large peaks in electricity demand during past heat waves with associated system failures. The impact of increased periods of hot weather, electricity price rises and system failure can be addressed in part through household behaviour; however it is concurrently exacerbated by housing designs which limit occupant choice. This paper employs outputs from the thermal analysis of typical Australian housing types to discuss this relationship between behaviour and design in future heat wave scenarios. Particular attention is given to populated regions forecast to experience a significant increase in heat waves in the future. Alterations to existing buildings and modifications of typical new house designs are utilised to demonstrate methods of reducing risks associated with extended periods of hot weather. In conclusion, a summary of the positive environmental and comfort implications of the modified designs is presented.Jasmine Palmer, Helen Bennetts, Stephen Pullen, Jian Zuo, Tony Ma, Nicholas Chilesh

INFRARED SPECTRA OF THE n-PROPYL AND i-PROPYL RADICALS IN SOLID PARA-HYDROGEN

We report the infrared spectra of the textit{n}-propyl and textit{i}-propyl radicals measured in solid para-hydrogen (textit{p}-chem{H_2}) matrices at 3.2 K. textit{n}-Propyl and textit{i}-propyl radicals were produced via the 248 nm irradiation of matrices formed by co-depositing textit{p}-chem{H_2} and either 1-Iodopropane (textit{n}-propyl) or 2-Iodopropane (textit{i}-propyl). Secondary photolysis was used to group spectral lines all due to the same species. Lines in the C-H stretching region were compared to previous work using the Helium Nanodroplet Isolation (HENDI) technique,footnote{Peter R. Franke, Daniel P. Tabor, Christopher P. Moradi, Gary E. Douberly, Jay Agarwal, Henry F. Schaefer III, and Edwin L. Sibert III, textit{Journal of Chemical Physics} textbf{145}, 224304 (2016).} and are in excellent agreement. In addition to a few lines previously measured in Ar matrices, we observe many previously unreported bands below 2000 wn, which we attribute to the textit{n}-propyl and textit{i}-propyl radicals. The assignment of features below 2000 wn are made via comparisons to anharmonic VPT2+K frequency computations

Accuracy of the Semi--Classical Approximation: the Pullen Edmonds Hamiltonian

A test on the numerical accuracy of the semiclassical approximation as a function of the principal quantum number has been performed for the Pullen--Edmonds model, a two--dimensional, non--integrable, scaling invariant perturbation of the resonant harmonic oscillator. A perturbative interpretation is obtained of the recently observed phenomenon of the accuracy decrease on the approximation of individual energy levels at the increase of the principal quantum number. Moreover, the accuracy provided by the semiclassical approximation formula is on the average the same as that provided by quantum perturbation theory.Comment: 12 pages, 5 figures (available upon request to the authors), LaTex, DFPD/93/TH/47, to be published in Nuovo Cimento

INFRARED SPECTRA OF PROPENE IN HELIUM NANODROPLETS AND SOLID PARA-HYDROGEN

We report the infrared spectra of propene in the C–H stretching region measured in helium nanodroplets (HENDI) at 0.4 K and solid \textit{para}-hydrogen (\textit{p}-\chem{H_2}) matrices at 3.2 K, in order to probe the effects of the matrix host environments on the experimental spectra. Propene is an ideal test molecule to study these matrix effects, due to the many anharmonic resonance polyads present in the C–H stretching region of the spectrum. We observe a 4 – 5 cm$^{-1}$ on average red-shift of the bands in \textit{p}-\chem{H_2} relative to HENDI. Moreover, the choice of matrix environment influences the positions and intensity ratios of transitions within each resonance polyad, leading to qualitatively different spectra. To better understand the nuances involved, simulations were performed that capture the important resonance interactions in a VPT2+K effective Hamiltonian. Certain elements of the Hamiltonian were adjusted to model the impact that different matrix environments have on the anharmonic couplings. In addition, propene reacted with hydrogen atoms \textit{via} electron bombardment of a \textit{p}-\chem{H_2} matrix during sample deposition, producing propyl radicals. \textit{i}-Propyl radicals were produced in greater proportion than \textit{n}-propyl radicals, indicating that for hydrogen addition to the double bond, the rate of addition to the terminal carbon (\textit{i}-propyl) is faster than the rate of addition to the center carbon (\textit{n}-propyl). Because the barriers for addition are approximately 700 cm$^{-1}$ – 1500 cm$^{-1}$ (1000 K – 2000 K), the only available mechanism for reaction in the \textit{p}-\chem{H_2} matrix (3.2 K) is tunneling. \textit{Ab initio} calculations were used to compute the tunneling probabilities for the formation of the \textit{n}-propyl and \textit{i}-propyl radicals. The rate of addition to the terminal carbon (\textit{i}-propyl) was calculated to be faster, in agreement with experiment