102,906 research outputs found
He+ dominance in the plasmasphere during geomagnetically disturbed periods: 1. Observational results
No full textObservations made by the DMSP 1710 satellite during the recovery phase from geomagnetic disturbances in June 1991 show regions of He+ dominance around 830 km altitude at 09:00 MLT. These regions are co-located with a trough in ionisation observed around 55degrees in the winter hemisphere. Plasma temperature and concentration observations made during the severe geomagnetic storm of 24 March 1991 are used as a case study to determine the effects of geomagnetic disturbances along the orbit of the F10 satellite. Previous explanations for He+ dominance in this trough region relate to the part of the respective flux tubes that is in darkness. Such conditions are not relevant for this study, since the whole of the respective flux tubes are sunlit. A new mechanism is proposed to explain the He+ dominance in the trough region. This mechanism is based on plasma transport and chemical reaction effects in the F-region and topside ionosphere, and on the time scales for such chemical reactions. Flux tubes previously depleted by geomagnetic storm effects refill during the recovery phase from the ionosphere as a result of pressure differences along the flux tubes. Following a geomagnetic disturbance, the He+ ion recovers quickly via the rapid photoionisation of neutral helium, in the F-region and the topside. The recovery of the O+ and H+ ions is less rapid. This is proposed as a result of the respective charge exchange reactions with neutral atomic hydrogen and oxygen. Preliminary model calculations support the proposed mechanism
[Report to W. F. Dyson by C. T. Burnley, March 10, 1967 #1]
No full textReport to W. F. Dyson by detective C. T. Burney. Burnley states that he has attached newspaper clippings to the report. The clippings appeared in the Dallas Morning News. The articles featured are titled "Man Claims Ferrie, Ruby, Oswald Link" and "Lawyer Testifies In Garrison Probe.
Assessing the George W. Bush Presidency: A Tale of Two Terms
No full textIn one of the first volumes assessing the full two terms of the George W. Bush presidency, Wroe and Herbert have gathered the work of leading American and European scholars. In fifteen succinct and incisive chapters, authorities such as Jim Pfiffner, John Maltese, Graham Wilson and Alan Gitelson offer assessments of the Bush administration's successes and failures. Extensive attention is paid to Bush's foreign policy, including 'The War on Terror' but the focus is broadened to absorb not only the Bush Doctrine and its repercussions, but also his trade and homeland security policies. The president's domestic leadership in economics and social policy is investigated, as are his dealings as president with the other institutions of the U.S. political system. The result is a comprehensive guide to the Bush presidency and its legacy
[Report to W. F. Dyson by C. T. Burnley, March 10, 1967 #2]
No full textReport to W. F. Dyson by detective C. T. Burney. Burnley states that he has attached newspaper clippings to the report. The clippings appeared in the Dallas Morning News. The articles featured are titled "Man Claims Ferrie, Ruby, Oswald Link" and "Lawyer Testifies In Garrison Probe.
Logarithmic variance profiles and the corresponding f-1 spectra of temperature fluctuations in turbulent Rayleigh-Bénard convection
No full textWe report experimental results for the temperature variance 2(z) and the corresponding frequency spectra P(f) in turbulent Rayleigh-Bénard convection (RBC) in a cylindrical sample of aspect ratioT= D/L = 1:00 (D = 1:12 m is the diameter and L = 1:12 m the height). The measurements were conducted in the Rayleigh-number range 1011 < Ra < 1:35 1014 and Pr ' 0:8. For Ra = 1:35x1014, 2(z) could be described well by a logarithmic dependence on the vertical position z in a range of z 1 < z < z 2 with z 1 ' 70 and z 2 = 0:1L. Here L=(2Nu) is the thickness of a thin thermal sublayer adjacent to the horizontal plate where the heat flux (denoted by the Nusselt number Nu) is carried mostly by thermal diffusion. In the log layer, we found that the temperature spectra had a significant frequency range over which P(f) f with close to 1. As Ra decreased, increased so that the log layer became thinner. At Ra = 2:05 1011, z 2 < z 1 and therefore there was no range for a log layer. Correspondingly, the temperature spectrum near the horizontal plate did not have the f1 scaling form either
F. C. Heim to Horace Kephart, May 16, 1898
No full textIn this letter of May 16, 1898, F. C. Heim writes Horace Kephart to let him know he has seen Kephart’s advertisement in the publication “Shooting and Fishing.” Heim is wondering if he could be in Kephart’s Sharpshooter organization even though he does not live in Saint Louis. He describes his physical characteristics and his shooting abilities along with his desire to fight for the country in the Spanish-American War
Detrital zircon and apatite (U‐Th)/He geochronology of intercalated baked sediments: a new approach to dating young basalt flows
No full textSimple numerical models suggest that many basaltic lava flows should sufficiently heat the sediments beneath them to reset (U‐Th)/He systematics in detrital zircon and apatite. This result suggests a useful way to date such flows when more conventional geochronological approaches are either impractical or yield specious results. We present here a test of this method on sediments interstratified with basalt flows of the Taos Plateau Volcanic Field of New Mexico. Nineteen zircons and apatites from two samples of baked sand collected from the uppermost 2 cm of a fluvial channel beneath a flow of the Upper Member of the Servilleta Basalt yielded an apparent age of 3.487 ± 0.047 Ma (2 SE confidence level), within the range of all published 40Ar/39Ar dates for other flows in the Upper Member (2.81–3.72 Ma) and statistically indistinguishable from the 40Ar/39Ar dates for basal flows of the Upper Member with which the studied flow is broadly correlative (3.61 ± 0.13 Ma). Given the high yield of 4He from U and Th decay, this technique may be especially useful for dating Pleistocene basalt flows. Detailed studies of the variation of (U‐Th)/He detrital mineral dates in sedimentary substrates, combined with thermal modeling, may be a valuable tool for physical volcanologists who wish to explore the temporal and spatial evolution of individual flows and lava fields.</p
Maine author Franklin F. Gould recalls his first glimpse of the outside world
No full textMaine author Franklin F. Gould recalls his first glimpse of the outside world as he relates how, as a young farm boy in the late 1800\u27s, he drove his father\u27s horses on an errand to an icebound river
F. C. Heim to Horace Kephart, June 12, 1898
No full textIn this letter of June 12, 1898, F. C. Heim writes Horace Kephart to let him know that he is sorry the government is not supporting the independent Sharpshooters. Heim sends 60 cents and asks Kephart to send him a copy of his Infantry tactics so he can prepare and he hopes to see a report on Kephart’s experiment with 30 caliber Winchester in the publication “Shooting and Fishing.”June 12, 1898
Haubstadt, Ind.
Mr. Horace Kephart.
Kind Sir
Your letter
viewed I wish to say that I am
sorry the government sees fit to
“pour cold water” upon those of us,
I say us for I am with you heart
and soul, who are trying to do
that which in my opinion he should
encourage and ought to have done
years ago.
But be of good cheer your movement
will not be lost.
I enclose money order to and of
60 cents; please send me Infantry
tactics. (paper) and mark that
part of the drill that applies to
your organization.
I should not like to come to you
as “green as a gourd” in regard
to military drill.
Hope you will report in S and F.
the result of your experiments
with the 30 cal. Winchester as adopted
by you. Yours
F. C. Hei
Collaborative Art Practices in HE: Mapping and Developing Pedagogical Models
No full textThis project asks ‘How is interdisciplinary collaboration "taught" in HE institutions?’ and ‘What pedagogical models can be identified and developed?’
Performing and Creative Arts departments in HE institutions engage students in collaborative practice within a singular discipline or across disciplines, through interdisciplinary or hybridised art forms, as curricula or extra-curricula activity. Where students are engaged with interdisciplinary collaboration within the curriculum, tuition may involve case studies of collaborative partnerships, psychometric tests, a trial and error approach to throwing creative individuals together, or any combination of these.
This project aims to bring together ideas and modes of practices used in HE institutions and to present, as far as is possible, an overview of the current practices where interdisciplinary collaboration is a focal point of the learning activity.
In brief, and in the context of Performing and Creative Arts departments in HE institutions, this development project aims to:
Take a snapshot of current practice in HE
Construct typologies of modes of practice
Consider how pedagogies may be developed
Disseminate documentation setting out, and commenting on, pedagogical approaches to collaborative practic
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