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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
Achieving Finite Element Mesh Quality via Optimization of the Jacobian Matrix Norm and Associated Quantities, Part 1 - A Framework for Surface Mesh Optimization
Structured mesh quality optimization methods are extended to optimization of unstructured triangular, quadrilateral, and mixed finite element meshes. N"ew interpretations of well-known nodally-bssed objective functions are made possible using matrices and matrix norms. The matrix perspective also suggests several new objective functions. Particularly significant is the interpretation of the Oddy metric and the Smoothness objective functions in terms of the condition number of the metric tensor and Jacobian matrix, respectively. Objective functions are grouped according to dimensionality to form weighted combinations. A simple unconstrained local optimum is computed using a modiiied N-ewton iteration. The optimization approach was implemented in the CUBIT mesh generation code and tested on several problems. Results were compared against several standard element-based quaIity measures to demonstrate that good mesh quality can be achieved with nodally-based objective functions.
Date:
January 18, 1999
Creator:
Knupp, P.M.
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 99, No. 264, Ed. 1 Monday, January 18, 1999
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 18, 1999
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Alvin Sun (Alvin, Tex.), Vol. 108, No. 48, Ed. 1 Monday, January 18, 1999
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
January 18, 1999
Creator:
Schwind, Jim & Looby, Edward
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 77, No. 68, Ed. 1 Monday, January 18, 1999
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
January 18, 1999
Creator:
Dobbs, Gary
Object Type:
Newspaper
System:
The Portal to Texas History
The Collegian (Hurst, Tex.), Vol. 11, No. 13, Ed. 1 Monday, January 18, 1999
Weekly student newspaper published in Hurst, Texas serving the Tarrant County Junior College District that includes school news and information along with advertising.
Date:
January 18, 1999
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Crystal extraction of beam from high energy hadron accelerators
This paper will report only the results of the crystal extraction experiments at Fermilab and CERN.
Date:
January 18, 1999
Creator:
Murphy, C. Thornton
Object Type:
Article
System:
The UNT Digital Library
[Documented Correspondence - Instructions and Procedures for Student Sample Selection]
A comprehensive letter, meticulously crafted by Education Studies, providing strategic guidance to Oakhurst Elementary School. Unveiling detailed instructions for the meticulous selection of the student sample and outlining procedural nuances, this unique document serves as a roadmap for ensuring assessment excellence at Oakhurst Elementary School.
Date:
January 18, 1999
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
[Documented Letter on Student Sample Selection Instructions and Assessment Procedures]
A comprehensive letter addressing Oakhurst Elementary School from Education Studies. The document outlines strategic guidance on the selection of the student sample for a specific assessment, providing detailed instructions and procedures to be followed.
Date:
January 18, 1999
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Enzymes for Degradation of Energetic Materials and Demilitarization of Explosives Stockpiles - SERDP Annual (Interim) Report, 12/98
The current stockpile of energetic materials requiring disposal contains about half a million tons. Through 2001, over 2.1 million tons are expected to pass through the stockpile for disposal. Safe and environmentally acceptable methods for disposing of these materials are needed. This project is developing safe, economical, and environmentally sound processes using biocatalyst (enzymes) to degrade energetic materials and to convert them into economically valuable products. Alternative methods for destroying these materials are hazardous, environmentally unacceptable, and expensive. These methods include burning, detonation, land and sea burial, treatment at high temperature and pressure, and treatment with harsh chemicals. Enzyme treatment operates at room temperature and atmospheric pressure in a water solution.
Date:
January 18, 1999
Creator:
Shah, M.M.
Object Type:
Report
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Monday, January 18, 1999
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 18, 1999
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
INEL1-microvolt spectrometer-reference instrument WBS 1.7.8.
INEL1 is a near-backscattering crystal-analyzer spectrometer designed to provide energy resolution of 5 to 15 {micro}eV. Figure 1 provides a schematic representation of INEL1, and Table 1 gives the parameters for this instrument. Two different analyzer crystal arrays allow two different primary choices of scattered neutron energy, and the possibility of using different orders from these arrays provides even more scattered energy choices.
Date:
January 18, 1999
Creator:
Crawford, R. K.
Object Type:
Report
System:
The UNT Digital Library
INEL2-100-microvolt spectrometer-reference instrument WBS 1.7.4.
INEL2 is a crystal-analyzer spectrometer optimized for quasielastic scattering and low-energy inelastic scattering and designed to provide energy resolution of {approximately}70 to 100 {micro}eV. Figure 1 provides a schematic representation of INEL2, and Table 1 gives the parameters for this instrument. The large solid angle subtended by the analyzer arrays leads to high data rates, making this an excellent instrument for real-time spectroscopic studies of chemical reactions, phase changes, and so forth.
Date:
January 18, 1999
Creator:
Crawford, R.K.
Object Type:
Report
System:
The UNT Digital Library
INEL4-wide-angle chopper spectrometer-reference instrument WBS 1.7.7.
INEL4 is designed to be the workhorse instrument for inelastic studies requiring good resolution and extended ranges in both Q and E. Figure 1 provides a schematic representation of INEL4, and Table 1 provides the parameters for this instrument. This instrument is capable of studies involving energy transfers ranging from a few meV to more than 1 eV. The wide angular coverage and large solid angle of detectors provide relatively high data rates and an extensive Q range.
Date:
January 18, 1999
Creator:
Crawford, R.K.
Object Type:
Report
System:
The UNT Digital Library
INEL5-single-crystal chopper spectrometer-reference instrument WBS 1.7.12.
INEL5 is designed for the study of relatively high energy cooperative excitations in single crystals. Figure 1 provides a schematic representation of INEL5, and Table 1 gives the parameters for this instrument. The use of linear position sensitive detectors provides good vector Q resolution, and the coverage of a large solid angle at low scattering angles permits sampling of the necessary regions of reciprocal space to follow the dispersion of these excitations. The instrument is optimized for studies with relatively high incident energies (tens to hundreds of meV), but can also be used with incident energies as low as 10 meV. Provision is made to allow addition at a later date of a detector bank at higher scattering angles in order to enhance the capabilities for the lower energy transfer studies.
Date:
January 18, 1999
Creator:
Crawford, R.K.
Object Type:
Report
System:
The UNT Digital Library
[News Clip: Bush Inaugural Preparations]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
January 18, 1999, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Bush Inauguration]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at
Date:
January 18, 1999
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Bush Perry]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
January 18, 1999, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Inauguration]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 6 PM.
Date:
January 18, 1999, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Perry Daily Journal (Perry, Okla.), Vol. 106, No. 11, Ed. 1 Monday, January 18, 1999
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 18, 1999
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
REF1-horizontal-surface reflectometer-reference instrument WBS 1.7.10.
REF1 is designed to-study the reflectivity of horizontal surfaces, such as a free liquid surface. Figure 1 provides a schematic representation of REF1, and Table 1 gives the parameters for this instrument. The instrument will be useful for a wide range of science, including interfacial studies in polymers and surface chemistry involving thin layers of surfactants or other materials on the surfaces of liquids. The instrument geometry will be flexible so that other capabilities (e.g., polarized neutrons) can be added at a later date. Data rates will be sufficiently high to permit kinetic studies on many systems.
Date:
January 18, 1999
Creator:
Crawford, R.K.
Object Type:
Report
System:
The UNT Digital Library