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Country
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Year
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Perry Daily Journal (Perry, Okla.), Vol. 106, No. 12, Ed. 1 Tuesday, January 19, 1999
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 19, 1999
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Phase segregation via Vlasov-Boltzmann particle dynamics
In order to better understand and model the phase segregation of binary fluids we opted for a mesoscopic description that proves to be simplifying both conceptually and computationally. The system that we studied is a mixture of two kinds of particles. All particles interact with each other through strong short-range interactions modeled by hard spheres with the same mass and diameter. There is also a smooth long-range repulsion between particles of different kinds. At low overall densities and weak enough repulsion the natural dynamical description for this system is given in terms of two coupled, energy and momentum conserving Vlasov- Boltzmann equations, making it what we call a dynamical mean-field model. The computational scheme that we used is a combination of direct sim- ulation Monte Carlo (DSMC) and particle-in-the-cell (PIC) evolution, that inherits the efficiency and robustness of these two algorithms. The DSMC is a stochastic algorithm due to Bird that consistently incorporates the as- sumptions behind the Boltzmann equation into the particle dynamics. The method is essentially the following: the physical space is divided into a net- work of cells containing typically tens of particles and the free flow of the particles over a small time interval {Delta}t is …
Date:
January 19, 1999
Creator:
Bastea, S.
Object Type:
Article
System:
The UNT Digital Library
[Press release: The Black Academy of Arts and Letters, Inc. in Conjunction with Delta Sigma Theta Sorority Presents Ruby Dee and Ossie Davis]
Press release from the Junior Black Academy of Arts and Letters discussing a one-woman show hosted on February 12-14, 1999 at the Naomi Bruton Theater.
Date:
January 19, 1999
Creator:
Junior Black Academy of Arts and Letters
Object Type:
Text
System:
The UNT Digital Library
Rains County Leader (Emory, Tex.), Vol. 111, No. 31, Ed. 1 Tuesday, January 19, 1999
Weekly newspaper from Emory, Texas that includes local, state, and national news along with advertising.
Date:
January 19, 1999
Creator:
Hill, Earl Clyde, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History
[Revised Draft Document on the TETAC Rating System]
A revised draft document designed for enhanced clarity, providing a comprehensive explanation of the TETAC Rating System.
Date:
January 19, 1999
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 84, No. 109, Ed. 1 Tuesday, January 19, 1999
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 19, 1999
Creator:
Horn, Richard A.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Scoping the parameter space for demo and the engineering test facility (ETF)
In our IFE development plan, we have set a goal of building an Engineering Test Facility (ETF) for a total cost of $2B and a Demo for $3B. In Mike Campbell� s presentation at Madison, we included a viewgraph with an example Demo that had 80 to � 250 MWe of net power and showed a plausible argument that it could cost less than $3B. In this memo, I examine the design space for the Demo and then briefly for the ETF. Instead of attempting to estimate the costs of the drivers, I pose the question in a way to define R&D goals: As a function of key design and performance parameters, how much can the driver cost if the total facility cost is limited to the specified goal? The design parameters examined for the Demo included target gain, driver energy, driver efficiency, and net power output. For the ETF; the design parameters are target gain, driver energy, and target yield. The resulting graphs of allowable driver cost determine the goals that the driver R&D programs must seek to meet.
Date:
January 19, 1999
Creator:
Meier, W. R.
Object Type:
Report
System:
The UNT Digital Library
The Sealy News (Sealy, Tex.), Vol. 112, No. 6, Ed. 1 Tuesday, January 19, 1999
Semiweekly newspaper from Sealy, Texas that includes local, state, and national news along with advertising.
Date:
January 19, 1999
Creator:
Galvan, Jimmy
Object Type:
Newspaper
System:
The Portal to Texas History
Single Bunch Stability to Monopole Excitation
We study single bunch stability with respect to monopole longitudinal oscillations in electron storage rings. Our analysis is different from the standard approach based on the linearized Vlasov equation. Rather, we reduce the full nonlinear Fokker-Planck equation to a Schroedinger-like equation which is subsequently analyzed by perturbation theory. We show that the Haissinski solution [3] may become unstable with respect to monopole oscillations and derive a stability criterion in terms of the ring impedance. We then discuss this criterion and apply it to a broad band resonator impedance model.
Date:
January 19, 1999
Creator:
Podobedov, Boris
Object Type:
Report
System:
The UNT Digital Library
Suspending Zeolite Particles In Tanks
The Savannah River Site (SRS) is in the process of removing waste (sludge and salt cake) from million gallon waste tanks. The current practice for removing waste from the tanks is adding water, agitating the tanks with long shaft vertical centrifugal pumps, and pumping the sludge/salt solution from the tank to downstream treatment processes. This practice has left sludge heels ({tilde} 30,000 gallons) in the bottom of the tanks. SRS is evaluating shrouded axial impeller mixers for removing the sludge heels in the waste tanks. The authors conducted a test program to determine mixer requirements for suspending sludge heels using the shrouded axial impeller mixers. The tests were performed with zeolite in scaled tanks which have diameters of 1.5, 6.0, and 18.75 feet. The mixer speeds required to suspend zeolite particles were measured at each scale. The data were analyzed with various scaling methods to compare their ability to describe the suspension of insoluble solids with the mixers and to apply the data to a full-scale waste tank. The impact of changes in particle properties and operating parameters was also evaluated. The conclusions of the work are: Scaling of the suspension of fast settling zeolite particles was best described by …
Date:
January 19, 1999
Creator:
Poirier, M.R.
Object Type:
Article
System:
The UNT Digital Library
Two-phase pressure drop of refrigerants during flow boiling in small channels : an experimental investigation and correlation development.
Two-phase flow pressure drop measurements were made during a phase-change heat transfer process with three refrigerants (R-134a, R-12, and R-113) at six different pressures ranging from 138 kPa to 856 kPa, and in two sizes of round tubes (2.46 mm and 2.92 mm inside diameters) and one rectangular channel (4.06 x 1.7 mm). State-of-the-art large-tube correlations failed to satisfactorily predict the experimental data. The data were used to develop a new correlation for two-phase pressure drop during flow boiling in small channels. The correlation was then tested against the experimental data for the three refrigerants; the error was {+-}20%.
Date:
January 19, 1999
Creator:
Chyu, M.-C.; France, D. M.; Tran, T. N. & Wambsganss, M. W.
Object Type:
Article
System:
The UNT Digital Library
University of Oklahoma
Photograph of a scene with a student and instructor with a laptop computer, at the University of Oklahoma.
Date:
January 19, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Using embedded systems for the remote delivery and recovery of National Ignition Facility and optical line replaceable units
This paper describes the design and development of the embedded control systems used to deliver and recover the National Ignition Facility (NIF) optical line replaceable units (LRUs). As part of the NIF Operations Special Equipment Control System (OSECS), the embedded control systems form a part of the front end processor (FEP) layer of the OSECS. During the start-up and operations phases of the NIF project, it is anticipated that a significant number of LRUs will be delivered to the laser beamline structure. The frequency of LRU delivery combined with the design of the facility pose severe constraints for human-only delivery and recovery operations. To reduce the risks to personnel and to allow for safe and efficient delivery of equipment, LLNL engineers are designing and developing embedded control systems for the low-level device control of NIF Transport and Handling mechanical delivery system components. The design of the embedded control system makes use of advanced PC-based motion control technology commonly found in industrial applications. The PC-based platform consists of commercial-off-the-shelf (COTS) hardware and software such as industrial computers, motion controllers, data acquisition boards, sensors technology, networking capabilities, development languages and operating system. Wireless networking technology is also being employed in the design …
Date:
January 19, 1999
Creator:
Perez, M L
Object Type:
Article
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 28, No. 18, Ed. 1 Friday, February 19, 1999
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 19, 1999
Creator:
Pace, Joshua
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
3D dislocation dynamics: stress-strain behavior and hardening mechanisms in FCC and BCC metals
A dislocation dynamics (DD) model for plastic deformation, connecting the macroscopic mechanical properties to basic physical laws governing dislocation mobility and related interaction mechanisms, has been under development. In this model there is a set of critical reactions that determine the overall results of the simulations, such as the stress-strain curve. These reactions are, annihilation, formation of jogs, junctions, and dipoles, and cross-slip. In this paper we discuss these reactions and the manner in which they influence the simulated stress- strain behavior in fcc and bcc metals. In particular, we examine the formation (zipping) and strength of dipoles and junctions, and effect of jogs, using the dislocation dynamics model. We show that the strengths (unzipping) of these reactions for various configurations can be determined by direct evaluation of the elastic interactions. Next, we investigate the phenomenon of hardening in metals subjected to cascade damage dislocations. The microstructure investigated consists of small dislocation loops decorating the mobile dislocations. Preliminary results reveal that these loops act as hardening agents, trapping the dislocations and resulting in increased hardening.
Date:
February 19, 1999
Creator:
Hirth, J P; Rhee, M; Zhib, H M & de la Rubia, T D
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 99, No. 292, Ed. 1 Friday, February 19, 1999
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 19, 1999
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Amendments Between the Houses
This report describes the process whereby the House and the Senate revise measures to be identical before sending them to the president.
Date:
February 19, 1999
Creator:
Saturno, James V.
Object Type:
Report
System:
The UNT Digital Library
Amendments Between the Houses
This report briefly summarizes the process of amendments between the House of Representatives and the Senate, which occurs if the House and Senate approve differing versions of a measure. An exchange of amendments between the houses resolves these differences.
Date:
February 19, 1999
Creator:
Saturno, James V.
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 77, No. 96, Ed. 1 Friday, February 19, 1999
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 19, 1999
Creator:
Dobbs, Gary
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 94, No. 15, Ed. 1 Friday, February 19, 1999
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
February 19, 1999
Creator:
Chionsini, Brandi
Object Type:
Newspaper
System:
The Portal to Texas History
Bus, Rail, HOV expansion projects in full swing
News release about recent and future DART expansion projects, including the creation of new rail lines and stations, building new HOV lanes, the purchase of new buses, and the upgrading of bus stops.
Date:
February 19, 1999
Creator:
Lyons, Morgan
Object Type:
Text
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 104, No. 15, Ed. 1 Friday, February 19, 1999
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
February 19, 1999
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
[Clipping: Taking Action: A User's Manual]
Copy of Texas Triangle magazine article "Taking Action: A User's Manual", page 5, dated February 19, 1999. The article includes information about the Hate Crimes Act, Adoption, Texas access, and Log Cabin Republicans.
Date:
February 19, 1999
Creator:
Ford, Nancy
Object Type:
Clipping
System:
The UNT Digital Library
Confidence Calculation with AMV+
The iterative advanced mean value algorithm (AMV+), introduced nearly ten years ago, is now widely used as a cost-effective probabilistic structural analysis tool when the use of sampling methods is cost prohibitive (Wu et al., 1990). The need to establish confidence bounds on calculated probabilities arises because of the presence of uncertainties in measured means and variances of input random variables. In this paper an algorithm is proposed that makes use of the AMV+ procedure and analytically derived probability sensitivities to determine confidence bounds on calculated probabilities.
Date:
February 19, 1999
Creator:
Fossum, A. F.
Object Type:
Article
System:
The UNT Digital Library