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621 Matching Results
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Elimination of electromagnetic radiation in plasma simulation: the Darwin or magnetoinductive approximation
For many astrophysical and most magnetic fusion applications, the purely electromagnetic modes generated by real as well as simulation ''plasma'' fluctuations are a source of high frequency radiation that is often irrelevant to the physics of interest. Unfortunately, a numerical CFL stability limit prevents either making c infinite or deltat large while using the usual explicit Maxwell's equations for the fields. A modification of Maxwell's equations, which provides implicitly the field components, circumvents this problem. The solution is to neglect retardation effects so that the electromagnetic propagation speed is effectively infinite. The purely electromagnetic modes in this limit evolve ''instantly'' to a time-asymptotic configuration about the macroscopic plasma configuration at each new time level. The Darwin or magnetoinductive approximation effectively provides infinite propagation speeds for purely electromagnetic modes by converting Maxwell's equations from hyperbolic to elliptic in character. In practice, this is accomplished by neglecting the solenoidal part of the displacement current. The elimination of the CFL time step constraint more than offsets the substantially more complicated field solution that is required. The details of a numerical implementation of this model will be presented. Numerical examples will be given and extentions of the Darwin field solution to other plasma models …
Date:
February 21, 1985
Creator:
Hewett, D.W.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0074.0797]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Deer Creek's David Paine fails to keep a wild pass from going out of bounds as Harold Roberts (24) of Amber-Pocasset pulls up short during the Antlers' 62-51 victory in a winner's bracket game of a class 2A regional Thursday night.."
Date:
February 21, 1980
Creator:
Grier, Bob
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0074.0798]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Amber-Pocasset's Harold Roberts tries to dribble around James Duggan of Deer Creek-Edmond during Thursday night's class 2A winners's bracket regional tournament game at Piedmont.."
Date:
February 21, 1980
Creator:
Grier, Bob
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0142.0122]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Builders have found the winter of 1979-80 to be no real problem for outdoor construction jobs - at least compared to the past two winters."
Date:
February 21, 1980
Creator:
Albright, Bob
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0149.0559]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
February 21, 1985
Creator:
Southerland, Paul B.
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0326.0272]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
February 21, 1987
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0304B.0246]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "David Johnson shoots over Derrick Vick"
Date:
February 21, 1985
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Hydrogen absorption by YNi/sub 5/, LaPt/sub 5/, and ThNi/sub 5/ intermetallics
The absorption of H by YNi/sub 5/, LaPt/sub 5/ and ThNi/sub 5/ at pressures above those reported in the literature were studied. These alloys were reported to absorb no significant H/sub 2/ at low pressures. (FS)
Date:
February 21, 1980
Creator:
Lakner, J. F. & Takeshita, T.
Object Type:
Report
System:
The UNT Digital Library
On-line monitoring of toxic materials in sewage at the Lawrence Livermore Laboratory
It is becoming increasingly important for industry to prevent releases of potentially toxic material to the environment. The Lawrence Livermore Laboratory has developed a system to monitor its sewage effluent on a continuous basis. A representative fraction of the total waste stream leaving the Plant is passed through a detection assembly consisting of an x-ray fluorescence unit which detects high levels of metals, sodium iodide crystal detectors that scan the sewage for the presence of elevated levels of radiation, and an industrial probe for pH monitoring. With the aid of a microprocessor, the data collected is reduced and analyzed to determine whether levels are approaching established environmental limits. Currently, if preset pH or radiation levels are exceeded, a sample of the suspect sewage is automatically collected for further analysis, and an alarm is sent to a station where personnel can be alerted to respond on a 24-hour basis. In the same manner, spectral data from the x-ray fluorescence unit will be routed through the 24-hour alarm system as soon as evaluation of the unit is complete. The design of the system and operational experience is discussed.
Date:
February 21, 1980
Creator:
Auyong, M.; Cate, J.L. Jr. & Rueppel, D.W.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0313B.0190]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Jim Jenkins - Blackwell"
Date:
February 21, 1985
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0309B.0224]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Speaker Jack Jackson visits briefly with EWI program director Pam Jones before dinner."
Date:
February 21, 1983
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0225.0306]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Southeast High School fans cheer on their wrestling team."
Date:
February 21, 1981
Creator:
Miller, Joe
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0261B.0387]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Rex and Aldyth Holloway and their pet, Buck Deer, relax under trees."
Date:
February 21, 1982
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0256.0445]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "David and Wanda Hendon, right, who run a Henryetta wrecker service, say they have started a war against the police department, gathering names and phone numbers of those who have complaints."
Date:
February 21, 1982
Creator:
Cook, J. Don
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0231.0428]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Production of subassembly and parts for the corporate jet airplane Gulfstream IV will mean jobs for at least 500 workers at Gulfstream Aerospace Co.'s Oklahoma City plant."
Date:
February 21, 1986
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0226.0738]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Retiring Oklahoma City Police Chief Lloyd Gramling gets an appreciation plaque from jack Harkins, crime prevention week committee chairman for the Exchange club."
Date:
February 21, 1985
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0267.0027]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Vernon J. House"
Date:
February 21, 1983
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0270.0169]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Kathryn Crumpler and Jerry Humphries are ready to tie the knot."
Date:
February 21, 1984
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0347.0066]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "George Kotnick"
Date:
February 21, 1985
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0316B.0339]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: ". . .and teammate Scott Johnson shows his agility on the parallel bars during Sunday's triangular meet at Lloyd Noble Center."
Date:
February 21, 1982
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0227.0371]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Cindy Gray gets a kick out of a recent practice session."
Date:
February 21, 1984
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0149.0561]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
February 21, 1985
Creator:
Southerland, Paul B.
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0150.0709]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Leap year makes South Oklahoma City resident Mrs. Robert ( Mary ) Edge 21 today..."
Date:
February 21, 1984
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0149.0560]
Photograph used for a story in the Daily Oklahoman newspaper.
Date:
February 21, 1985
Creator:
Southerland, Paul B.
Object Type:
Photograph
System:
The Gateway to Oklahoma History