5,120 research outputs found
The model-independence of cosmic ray source determinations
The direct inversion method of Margolis is used to explore the dependence of Z less than or equal to 28 source abundance determinations on the choice of the pathlength distribution. The source abundances do not depend strongly on the form of the truncation used, although some truncation at the lower energies (compared to a leaky box) is necessary. The decrease of mean grammage with increasing energy is required by the observations. The effects of errors and he use of other secondary to primary ratios is discussed
Sources of the ultraheavy cosmic rays
The suggestions that the source abundances of cosmic ray nuclei heavier then Fe differ significantly from Solar System abundances are not well supported by the data without assuming preferential acceleration. The Solar System abundances of Pb and Bi are split into r-, standard s-, and cyclic 8-process components; the apprarent deficiency of Pb seen in the HEAO-3 Heavy Nuclei Experiment data might indicate an absence of Pb from the recycling 8-process
Alfven wave scattering and the secondary to primary ratio
The cosmic ray abundances have traditionally been used to determine the elemental and isotopic nature of galactic ray sources and average measures of propagation conditions. Detailed studies of the physics of propagation are usually paired with relatively straightforward estimates of the secondary-to-primary (S/P) ratios. In the work reported here, calculations of elemental abundances are paired with a more careful treatment of the propagation process. It is shown that the physics of propagation does indeed leave specific traces of Galactic structure in cosmic ray abundances
A note on compactly generated co-t-structures
The idea of a co-t-structure is almost "dual" to that of a t-structure, but
with some important differences. This note establishes co-t-structure analogues
of Beligiannis and Reiten's corresponding results on compactly generated
t-structures.Comment: 10 pages; details added to proofs, small correction in the main
resul
Theoretical Calculations of the Pressures, Forces, and Moments Due to Various Lateral Motions Acting on Tapered Sweptback Vertical Tails with Supersonic Leading and Trailing Edges
Based on expressions for the linearized velocity potentials and pressure distributions given in NACA Technical Report 1268, formulas for the span load distribution, forces, and moments are derived for families of thin isolated vertical tails with arbitrary aspect ratio, taper ratio, and sweepback performing the motions constant sideslip, steady rolling, steady yawing, and constant lateral acceleration. The range of Mach number considered corresponds, in general, to the condition that the tail leading and trailing edges are supersonic. To supplement the analytical results, design-type charts are presented which enable rapid estimation of the forces and moments (expressed as stability derivatives) for given combinations of geometry parameters and Mach number
The hydrolysis of proteins by microwave energy
Microwave energy, at manually-adjusted, partial power settings
has been used to hydrolyse bovine serum albumin at 125 °C. Hydrolysis was complete within 2 h, except for valine and isoleucine which were completely liberated within 4 h. The aminoacid destruction was less than that observed at similar hydrolysis
conditions with other methods and complete hydrolysis was achieved more rapidly. These results provide a basis for automating the process of amino-acid hydrolysis
Cost analysis of a transition to green vehicle technology for light duty fleet vehicles in Public Works Department–Naval Support Activity Monterey (PWD Monterey)
MBA Professional ReportThe MBA Project is a detailed cost analysis of various mature green vehicle technologies that can be implemented by Public Works Department–Naval Support Activity Monterey (PWD Monterey) and its subordinate entities, with the intent of reducing both overall life-cycle vehicle costs and carbon emissions. The focus is on light-duty, non-tactical vehicles in use in the region. The cost analysis explores Plug-In Hybrid Electric Vehicles (PHEV), the infrastructure required to operate them, and the social cost of carbon emissions (SCC). Our model indicates that it is not economically beneficial to implement green vehicle technologies on a fleet-wide level for PWD Monterey. Although there are SCC benefits, and right-sizing fleet vehicles to suitable alternatives leads to savings, the increased cost of PHEVs and relatively large required infrastructure cost outpace the total benefits.http://archive.org/details/costnalysisoftra1094547924Lieutenant Commander, United States NavyLieutenant, United States NavyApproved for public release; distribution is unlimited
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