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627 Matching Results
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Computed and experimental interactions between eddy structure and dispersed particles in developing free shear layers
We are investigating the interactive process between turbulent flow and dispersed phase particles. We are focusing on the mechanisms that appear to result in a reduction of local turbulent intensity and a corresponding reduction in wall heat transfer and subsequent wall erosion in turbulent solid propellant combustion flow. We apply computational simulations and physical experiments specialized to a developing free shear layer over a rearward facing step and over a parallel splitter plate. The flow configuration evolves in a two-dimensional, steady, combustion and non-combustion turbulent free shear mixing region, with and without particle additives. The computational simulations combine three basic components: gas phase Navier-Stokes solutions, Lagrange particle field solutions and a Monte Carlo technique for the random encounters, forces and accelerations between the two fields. We concentrate here on relatively large sized additive particles (of the order of tens of microns to 100 microns mean diameter). We examine their apparent influence in breaking up the larger, energy bearing eddy structures into smaller structures which are more readily dissipated.
Date:
May 20, 1982
Creator:
Buckingham, A. C.; Siekhaus, W. J.; Keller, J. O.; Ellzey, J.; Hubbard, G. & Daily, J. W.
Object Type:
Article
System:
The UNT Digital Library
Automatic voltage-imbalance detector
A device is described for indicating and preventing damage to voltage cells such as galvanic cells and fuel cells connected in series by detecting sequential voltages and comparing these voltages to adjacent voltage cells. The device is implemented by using operational amplifiers and switching circuitry is provided by transistors. The device can be utilized in battery powered electric vehicles to prevent galvanic cell damage and also in series connected fuel cells to prevent fuel cell damage.
Date:
May 20, 1981
Creator:
Bobbett, R. E.; McCormick, J. B. & Kerwin, W. J.
Object Type:
Patent
System:
The UNT Digital Library
Fusion product deposition and energy balance
Extensive Monte-Carlo calculations were performed of alpha-particle deposition in the Hill's Vortex configuration, as reported in D.E. Driemeyer's Ph.D. Thesis (University of Illinois, 1980). This has generally been done including a cold plasma density, n/sub c/, on the open field lines, with n/sub C//T/sub C//sup 3/2/ approx. = n/sub H//T/sub H//sup 3/2/ - i.e. with the slowing down ratio tau/sub H//tau/sub C/ lying between .1 and 10. Since many of the alpha particles spend a significant amount of their time on the open field lines, values of tau/sub H//tau/sub C/ greater than unity lead to significant removal of alpha-particle ash from the closed-field region. Surprisingly, one is able to perform this ash removal and still retain enough energy to raise the reactor Q significantly (or even ignite it).
Date:
May 20, 1980
Creator:
Condit, W.C. & Driemeyer, D.E.
Object Type:
Report
System:
The UNT Digital Library
Radiation interactions for tomography. Revision 1
There are new requirements emerging in the field of tomography: the need for spatial resolution in the micrometre range, atomic species specificity, and quantitative density discrimination.
Date:
May 20, 1985
Creator:
Zolnay, A.S.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0071.0210]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Guthrie third baseman Randy Hewell seems to be picking the pocket of Mustang's Larry Bryant in a rundown."
Date:
May 20, 1982
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0139.0330]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Teresa Cole displays a few of the items that will be on sale at the Bluff Creek Neighborhood Association's annual arts and crafts fair."
Date:
May 20, 1982
Creator:
Albright, Bob
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0172.0042]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Edmond Parks Officials have removed most of the hazardous planks from the benches at Barnett Field."
Date:
May 20, 1981
Creator:
Smith, Stacy
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0156.0646]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Deer Creek High School valedictorians are, from left, front, Julie Lubbers, Penny Patterson and Leslie Yates and , back, Scott Burress, Chris Conger and Robbie Barclay."
Date:
May 20, 1987
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0149.0119]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "In 1961, ARMED with his first drivers license Darrell Crosby cruised the teen hang-outs near Classen High School in an autumn gold, 1955 Chevy convertible, but dreamed of someday owning a Chevrolet Corvette sports car."
Date:
May 20, 1982
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0155.0134]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "1980 Dem. Convention delegate ."
Date:
May 20, 1980
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0139.0422]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Contactor Don Coleman examines rows of solar collectors that his company has installed on the south wall of Henrietta B. Foster Community Center to help heat and cool the gymnasium."
Date:
May 20, 1981
Creator:
Buehner, Jeff
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0139.0400]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Bill Bittinger (Dabney Coleman) is surprised when a psychiatrist (carol Williams, center) who is a guest on his TV talk show, brings along his daughter (Pippa Peartree) in an effort to mend the rift between them."
Date:
May 20, 1983
Creator:
NBC News
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Tracking federal land management: Report No. 3 on federal land management actions impacting geothermal commecialization at selected target prospects in the five Pacific Rim states
Generic land management actions affecting geothermal commerializtion in Pacific River states are reviewed. Specific federal land management actions affecting geothermal prospects in California and the Pacific Northwest are described. (MHR)
Date:
May 20, 1980
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Reduction of the beam breakup mode Q values in the ETA/ATA Accelerating Cells
Earlier Microwave Measurements of the ETA Accelerating Cells has uncovered eleven resonances in the frequency range of 0 > 850 MHz. The Q values of these modes ranged from 14 to 70. A three phase program directed at substantially reducing these Q values is reported. In particular the dampening methods described below resulted in a decrease of Q value from 40 to 5 for the beam breakup mode (TM/sub 110/) with a corresponding reduction for most of the other cavity modes.
Date:
May 20, 1980
Creator:
Birx, D.L.
Object Type:
Report
System:
The UNT Digital Library
Fundamentals and techniques of nonimaging optics for solar energy concentration. Final report
Nonimaging optics is a new discipline with techniques, formalism and objectives quite distinct from the traditional methods of focusing optics. These new systems achieve or closely approach the maximum concentration permitted by the Second Law of Thermodynamics for a given angular acceptance and are often called ideal. Application of these new principles to solar energy over the past seven years has led to the invention of a new class of solar concentrators, the most well known version of which is the Compound Parabolic Concentrator or CPC. A new formalism for analyzing nonimaging systems in terms of a quantity called the geometrical vector flux has been developed. This has led not only to a better understanding of the properties of ideal concentrators but to the discovery of several new concentrator designs. One of these new designs referred to as the trumpet concentrator has several advantageous features when used as a secondary concentrator for a point focusing dish concentrator. A new concentrator solution for absorbers which must be separated from the reflector by a gap has been invented. The properties of a variety of new and previously known nonimaging optical configurations have been investigated: for example, Compound Elliptical Concentrators (CEC's) as secondary …
Date:
May 20, 1980
Creator:
Winston, R.
Object Type:
Report
System:
The UNT Digital Library
Cascade ICF power reactor
The double-cone-shaped Cascade reaction chamber rotates at 50 rpm to keep a blanket of ceramic granules in place against the wall as they slide from the poles to the exit slots at the equator. The 1 m-thick blanket consists of layers of carbon, beryllium oxide, and lithium aluminate granules about 1 mm in diameter. The x rays and debris are stopped in the carbon granules; the neutrons are multiplied and moderated in the BeO and breed tritium in the LiAlO/sub 2/. The chamber wall is made up of SiO tiles held in compression by a network of composite SiC/Al tendons. Cascade operates at a 5 Hz pulse rate with 300 MJ in each pulse. The temperature in the blanket reaches 1600 K on the inner surface and 1350 K at the outer edge. The granules are automatically thrown into three separate vacuum heat exchangers where they give up their energy to high pressure helium. The helium is used in a Brayton cycle to obtain a thermal-to-electric conversion efficiency of 55%. Studies have been done on neutron activation, debris recovery, vaporization and recondensation of blanket material, tritium control and recovery, fire safety, and cost. These studies indicate that Cascade appears to …
Date:
May 20, 1986
Creator:
Hogan, W.J. & Pitts, J.H.
Object Type:
Article
System:
The UNT Digital Library
Scalar potential for charge distributions with ellipsoidal symmetry
Calculation of the electrostatic scalar potential in ellipsoidal coordinates is outlined. The ellipsoidal coordinate system is described, and the Laplace equation is discussed for this system. Special charge distributions having ellipsoidal symmetry, and therefore most easily treated in ellipsoidal coordinates, are assumed and their scalar potentials calculated, including the ellipsoidal shell, two-dimensional and three-dimensional Gaussian charge distribution, and two-dimensional uniform distribution. 2 refs. (LEW)
Date:
May 20, 1986
Creator:
Gluckstern, R.L.
Object Type:
Report
System:
The UNT Digital Library
Economic studies for heavy-ion-fusion electric power plants
We have conducted parametric economic studies for heavy-ion-fusion electric power plants. We examined the effects on the cost of electricity of several design parameters: cost and cost scaling for the reactor, driver, and target factory; maximum achievable chamber pulse rate; target gain; electric conversion efficiency; and net electric power. Using the most recent estimates for the heavy-ion-driver cost along with the Cascade reactor cost and efficiency, we found that a 1.5 to 3 GWe heavy-ion-fusion power plant, with a pulse rate of 5 to 10 Hz, can be competitive with nuclear and coal power plants.
Date:
May 20, 1986
Creator:
Meier, W. R.; Hogan, W. J. & Bangerter, R. O.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0324.0211]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Fran Keesee"
Date:
May 20, 1985
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0305B.073]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Once-in-a-lifetime graduation costs are easily accepted by graduates such as Linda Jones, U.S. Grant High School senior."
Date:
May 20, 1980
Creator:
Longstreath, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0310B.0164]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "F. V. Jobe looks over a monument to Oklahoma City's first oil well."
Date:
May 20, 1981
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0308B.0366]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Forex Neptune district manager Marcel Jeandemange and task force technician George Low display the company's big foot iron roughneck, a safety tool for use on a drilling rig."
Date:
May 20, 1982
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0260B.0658]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Proudly displaying their prize winning scrapbook are Linwood Elementary students, form left, Jackie Holder, Andrea Story, Derrick Butler, Theresa Clark and Sabrina Suarez."
Date:
May 20, 1981
Creator:
Albright, Bob
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0329.0508]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Host John Kilpatrick, right, talks with Henry Moran, Mid America Arts Alliance director, and Amy Aspell, Arkansas Arts Council chief."
Date:
May 20, 1985
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History