2,201 research outputs found
High temperature thermocouple design provides gas cooling without increasing overall size of unit
High temperature thermocouple uses a thermoelement of noncircular cross section with insulation of circular cross section to provide space for the flow of coolant gas down the probe
Silicon solar cell monitors high temperature furnace operation
Silicon solar cell, attached to each viewpoint, monitors that incandescent emission from the hot interior of a furnace without interfering with the test assembly or optical pyrometry during the test. This technique can provide continuous indication of hot spots or provide warning of excessive temperatures in cooler regions
Vapor deposition process provides new method for fabricating high temperature thermocouples
Fabrication techniques for high temperature thermocouples bind all components so that differential thermal expansion and contraction do not result in mechanical slippage and localized stress concentrations. Installation space is reduced or larger thermoelements and thicker insulation can be used to improve temperature measurement accuracy
Thoriated tungsten tube provides improved high temperature thermocouple sheath
Thermocouple tubing of thoriated tungsten with a very fine grain structure produces a small-diameter sheath capable of operating up to 5000 degrees R in a hydrogen and graphite environment. This tubing remains ductile and resists both grain growth and carbiding even after prolonged exposure to temperature
Supplementary report on antilock analyses
Generic modulator analysis was performed to quantify the effects of dump and reapply pressure rates on antilock stability and performance. Analysis will include dump and reapply rates, and lumped modulator delay. Based on the results of the generic modulator analysis and earlier toggle optimization analysis (with Mitsubishi modulator), a recommended preliminary antilock design was synthesized and its response and performance simulated. The results of these analyses are documented
Chewing gum and impasse-induced self-reported stress
An insoluble anagram task (Zellner et al., 2006) was used to investigate the proposition that chewing gum reduces self-rated stress (Scholey et al., 2009). Using a between-participants design, forty participants performed an insoluble anagram task followed by a soluble anagram task. These tasks were performed with or without chewing gum. Self-rated measures were taken at baseline, post-stressor, and post-recovery task. The insoluble anagram task was found to amplify stress in terms of increases in self-rated stress and reductions in both self-rated calmness and contentedness. However, chewing gum was found not to mediate the level of stress experienced. Furthermore, chewing gum did not result in superior performance on the soluble anagram task. The present study fails to generalise the findings of Scholey et al. to an impasse induced stress that has social components. The explanation for the discrepancy with Scholey et al. is unclear; however, it is suggested that the impossibility of the insoluble anagram task may negate any secondary stress reducing benefits arising from chewing gum-induced task improvement
Harold Jeffreys's Theory of Probability Revisited
Published exactly seventy years ago, Jeffreys's Theory of Probability (1939)
has had a unique impact on the Bayesian community and is now considered to be
one of the main classics in Bayesian Statistics as well as the initiator of the
objective Bayes school. In particular, its advances on the derivation of
noninformative priors as well as on the scaling of Bayes factors have had a
lasting impact on the field. However, the book reflects the characteristics of
the time, especially in terms of mathematical rigor. In this paper we point out
the fundamental aspects of this reference work, especially the thorough
coverage of testing problems and the construction of both estimation and
testing noninformative priors based on functional divergences. Our major aim
here is to help modern readers in navigating in this difficult text and in
concentrating on passages that are still relevant today.Comment: This paper commented in: [arXiv:1001.2967], [arXiv:1001.2968],
[arXiv:1001.2970], [arXiv:1001.2975], [arXiv:1001.2985], [arXiv:1001.3073].
Rejoinder in [arXiv:0909.1008]. Published in at
http://dx.doi.org/10.1214/09-STS284 the Statistical Science
(http://www.imstat.org/sts/) by the Institute of Mathematical Statistics
(http://www.imstat.org
40Ar/39Ar ages of lunar impact glasses: Relationships among Ar diffusivity, chemical composition, shape, and size
Lunar impact glasses, quenched melts produced during cratering events on the
Moon, have the potential to provide not only compositional information about
both the local and regional geology of the Moon but also information about the
impact flux over time. We present in this paper the results of 73 new 40Ar/39Ar
analyses of well-characterized, inclusion-free lunar impact glasses and
demonstrate that size, shape, chemical composition, fraction of radiogenic 40Ar
retained, and cosmic ray exposure (CRE) ages are important for 40Ar/39Ar
investigations of these samples. Specifically, analyses of lunar impact glasses
from the Apollo 14, 16, and 17 landing sites indicate that retention of
radiogenic 40Ar is a strong function of post-formation thermal history in the
lunar regolith, size, and chemical composition. Based on the relationships
presented in this paper, lunar impact glasses with compositions and sizes
sufficient to have retained 90% of their radiogenic Ar during 750 Ma of cosmic
ray exposure at time-integrated temperatures of up to 290 K have been
identified and are likely to have yielded reliable 40Ar/39Ar ages of formation.
Additionally, ~50% of the identified impact glass spheres have formation ages
of <500 Ma, while ~75% of the identified lunar impact glass shards and spheres
have ages of formation <2000 Ma. The observed age-frequency distribution of
lunar impact glasses may reflect two processes: (i) diminished preservation due
to spontaneous shattering with age; and (ii) preservation of a remnant
population of impact glasses from the tail end of the terminal lunar
bombardment having 40Ar/39Ar ages up to 3800 Ma. A protocol is described for
selecting and analyzing lunar impact glasses.Comment: Please contact Zellner ([email protected]) for data tables and
other supplemental informatio
Phylogenetic analysis of segment 10 from African horsesickness virus and cognate genes from other orbiviruses
Utilizing the reverse transcriptase-polymerase chain reaction (RT-PCR) procedure, we have synthesized full-length copies of segment 10 from African horsesickness virus (AHSV) serotypes 1,4 and 8. The genes were cloned, sequenced and compared with the sequence of the cognate gene from AHSV serotypes 3 and 9. Sequences were analyzed to assess evolutionary relationships among serotypes using cladistics. Based on this analysis the data support a close relationship between serotypes 4 and 9 and between serotypes 1 and 8 and a closer relationship of serotype 3 to the 4 and 9 group
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