13,331 research outputs found
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Oxygen isotopic constraints on the origin and parent bodies of eucrites, howardites, and diogenites
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Oxygen Isotopic Constraints on the Number and Origin of Basaltic Achondrite Parent Bodies
Our data show that HED meteorites have a homogeneous oxygen isotopic composition consistent with a magma ocean on Vesta. Ibitira, Asuka 881394, Pasamonte, and NWA 1240 probably come from separate parent asteroids
The effect of combustor outlet temperature profiles on ramjet thrust
The desirability of obtaining an even distribution of
temperature at the outlet of a ramjet combustor is indicated
theoretically. Results of experiments on a particular
combustion system over a limited range of conditions using
a series of mixers are presented. The results suggest that
mixers are desirable for high Mach Number ramjets operating
at low overall fuel-air ratios.
The material presented in this report is based on the
work carried out by M. R. Williams in partial fulfilment of the requirements for the Diploma of the College of
Aeronautics, and is essentially a summary of his thesis.
The work was part of M.O.S. Research Contract 7/Exptl./72
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Mineralogy and Geochemistry of Shergottite RBT 04262
This abstract presents mineralogical and geochemical data on newly discovered shergottite RBT 04262 and compares it with other known shergottites
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Tafassasset: The Saga Continues
In this study, we compare data for two separate Tafassasset stones and supply new oxygen isotope data for our sample. We include a discussion of the debate surrounding the classification of Tafassasset and offer a hypothesis for its origin based upon new information
Crowding at the Front of the Marathon Packs
We study the crowding of near-extreme events in the time gaps between
successive finishers in major international marathons. Naively, one might
expect these gaps to become progressively larger for better-placing finishers.
While such an increase does indeed occur from the middle of the finishing pack
down to approximately 20th place, the gaps saturate for the first 10-20
finishers. We give a probabilistic account of this feature. However, the data
suggests that the gaps have a weak maximum around the 10th place, a feature
that seems to have a sociological origin.Comment: 5 pages, 2 figures; version 2: published manuscript with various
changes in response to referee comments and some additional improvement
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Origin of the ungrouped achondrite NWA 4518: mineralogy and geochemistry of FeNi-metal
Ungrouped achondrite NWA 4518 is an ultramafic breccia with abundant siderophile rich IIA-like metal. Its silicate chemistry is similar to that of WINs, HEDs, and silicate inclusions of IIE irons. Oxygen isotopic composition is nearby IAB-IIICD-WIN
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Paris: The slightly altered, slightly metamorphosed CM that bridges the gap between CMs and Cos
A fresh, 1.3 kilo stone was found in Paris. It is a CM chondrite with metal, Fe-sulfide, FeS-rich PCPs and relict mesostasis and is ~3.0 ± 0.1. Petrographic and oxygen isotope evidence indicates that it has affinities with the CO chondrites
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