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(6)Li, (7)Li Nuclear Magnetic Resonance Investigation of Lithium Coordination in Binary Phosphate Glasses
{sup 6}Li and {sup 7}Li solid state magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy has been used to investigate the local coordination environment of lithium in a series of xLi{sub 2}O {center_dot} (1-x)P{sub 2}O{sub 5} glasses, where 0.05 {le} x {le} 0.55. Both the {sup 6}Li and {sup 7}Li show chemical shift variations with changes in the Li{sub 2}O concentration, but the observed {sup 6}Li NMR chemical shifts closely approximate the true isotropic chemical shift and can provide a measure of the lithium bonding environment. The {sup 6}Li NMR results indicate that in this series of lithium phosphate glasses the Li atoms have an average coordination between four and five. The results for the metaphosphate glass agree with the coordination number and range of chemical shifts observed for crystalline LiPO{sub 3}. An increase in the {sup 6}Li NMR chemical shift with increasing Li{sub 2}O content was observed for the entire concentration range investigated, correlating with increased cross-linking of the phosphate tetrahedral network by O-Li-O bridges. The {sup 6}Li chemical shifts were also observed to vary monotonically through the anomalous glass transition temperature (T{sub g}) minimum. This continuous chemical shift variation shows that abrupt changes in the Li coordination …
Date:
February 8, 1999
Creator:
Alam, T.M.; Boyle, T.J.; Brow, R.K. & Conzone, S.
Object Type:
Article
System:
The UNT Digital Library
The 10-20-30 Plan and Persistent Poverty Counties
This report discusses the 10-20-30 plan of reallocating funds in rural development programs toward counties with systemic poverty levels defined as 20% of the population being at or below poverty level for 30 years. This report explains why targeting funds to persistent poverty counties might be of interest, how "persistent poverty" is defined and measured, and how different interpretations of the definition and different data source selections could yield different lists of counties identified as persistently poor. This report does not compare the 10-20-30 plan's advantages and disadvantages against other policy options, nor does it examine the range of programs or policy goals for which the 1020-30 plan might be an appropriate policy tool.
Date:
February 8, 2018
Creator:
Dalaker, Joseph
Object Type:
Report
System:
The UNT Digital Library
100 Areas, January 29 through February 4, 1946
The B Pile operated 25 MW below rated power level without interruption during the week. The D Pile was shut down on January 29. During the shutdown 103 tubes were discharged. The shut down lasted for 15 hours. During operation after the shut down power was reduced to meet graphite temperature restrictions. The F Pile was run steadily throughout the week at 25 MW below rated level. Iron content in the process water averaged 0.015, 0.011 and 0.010 ppm at B, D, and F Areas, respectively. Examination of the slugs discharged from four corrosion tubes at F has been completed. A summary of conditions found in the vertical and horizontal aluminium thimbles at D and F during a recent inspection are given. Results are given on the graphite expansion problem.
Date:
February 8, 1946
Creator:
Jordan, W. E.
Object Type:
Report
System:
The UNT Digital Library
2000 Savannah River Biological Surveys for Westinghouse Savannah River Company
The Academy of Natural Sciences of Philadelphia has been conducting biological and water quality studies of the Savannah River since 1951. These studies are designed to assess potential effects of Savannah River Site (SRS) contaminants and warm-water discharges on the general health of the river and its tributaries. The study design includes multiple biological groups spanning a broad range of ecological roles, both because no single group is the best indicator of every component of water quality and because there is wide-spread agreement that protecting the entire system is important.
Date:
February 8, 2002
Creator:
Arnett, M.
Object Type:
Report
System:
The UNT Digital Library
2008 President's Budget Rollout
This report summarizes NOAA performance during the 2006 fiscal year as well as budget and program change highlights.
Date:
February 8, 2007
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
80th Texas Legislature, Regular Session, Senate Concurrent Resolution 14
Concurrent resolution introduced by the Texas Senate and House of Representatives granting the legislature permission to adjourn for more than three days during the period beginning on Wednesday, January 31, 2007, and ending on Monday, February 5, 2007.
Date:
February 8, 2007
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
Ab Initio Many-Body Calculations of Deuteron-4He Scattering And 6Li States
None
Date:
February 8, 2011
Creator:
Quaglioni, S & Navratil, P
Object Type:
Article
System:
The UNT Digital Library
ABSTRACTION OF DRIFT SEEPAGE
Drift seepage refers to flow of liquid water into repository emplacement drifts, where it can potentially contribute to degradation of the engineered systems and release and transport of radionuclides within the drifts. Because of these important effects, seepage into emplacement drifts is listed as a ''principal factor for the postclosure safety case'' in the screening criteria for grading of data in Attachment 1 of AP-3.15Q, Rev. 2, ''Managing Technical Product Inputs''. Abstraction refers to distillation of the essential components of a process model into a form suitable for use in total-system performance assessment (TSPA). Thus, the purpose of this analysis/model is to put the information generated by the seepage process modeling in a form appropriate for use in the TSPA for the Site Recommendation. This report also supports the Unsaturated-Zone Flow and Transport Process Model Report. The scope of the work is discussed below. This analysis/model is governed by the ''Technical Work Plan for Unsaturated Zone Flow and Transport Process Model Report'' (CRWMS M&O 2000a). Details of this activity are in Addendum A of the technical work plan. The original Work Direction and Planning Document is included as Attachment 7 of Addendum A. Note that the Work Direction and Planning …
Date:
February 8, 2001
Creator:
Wilson, Michael L.
Object Type:
Report
System:
The UNT Digital Library
Adaptive path planning algorithm for cooperating unmanned air vehicles
An adaptive path planning algorithm is presented for cooperating Unmanned Air Vehicles (UAVs) that are used to deploy and operate land-based sensor networks. The algorithm employs a global cost function to generate paths for the UAVs, and adapts the paths to exceptions that might occur. Examples are provided of the paths and adaptation.
Date:
February 8, 2001
Creator:
Cunningham, C T & Roberts, R S
Object Type:
Article
System:
The UNT Digital Library
Adiabatic shear band formation in explosively driven AerMet-100 alloy cylinders
Two differently heat-treated AerMet-100 alloy cylinders were explosively driven to fragmentation. Soft-captured fragments were studied to characterize the deformation and damage induced by high explosive loading. The characterization of the fragments reveals that the dominant failure mechanism appears to be dynamic fracture along adiabatic shear bands. These shear bands differ in size and morphology depending on the heat-treated conditions. Nanoindentation measurements of the adiabatic shear bands in either material condition indicate higher hardness in the bands compared to the matrix regions of the fragments.
Date:
February 8, 2006
Creator:
Sunwoo, A J; Becker, R; Goto, D M; Orzechowski, T J; Springer, H K; Syn, C K et al.
Object Type:
Article
System:
The UNT Digital Library
Adjustable End Die.
Patent for improvements to adjustable end dies. These improvements allow convenient rethreading of bolts while it is engaged with an object.
Date:
February 8, 1921
Creator:
Wright, John G.
Object Type:
Patent
System:
The Portal to Texas History
Advanced membrane separation technology for biosolvents. Final CRADA report.
Argonne and Vertec Biosolvents investigated the stability and perfonnance for a number of membrane systems to drive the 'direct process' for pervaporation-assisted esterification to produce lactate esters. As outlined in Figure 1, the target is to produce ammonium lactate by fennentation. After purification and concentration, ammonium lactate is reacted with ethanol to produce the ester. Esterification is a reversible reaction so to drive the reaction forward, the produced ammonia and water must be rapidly separated from the product. The project focused on selecting pervaporation membranes with (1) acid functionality to facilitate ammonia separation and (2) temperature stability to be able to perform that reaction at as high a temperature as possible (Figure 2). Several classes of commercial membrane materials and functionalized membrane materials were surveyed. The most promising materials were evaluated for scale-up to a pre-commercial application. Over 4 million metric tons per year of solvents are consumed in the U.S. for a wide variety of applications. Worldwide the usage exceeds 10 million metric tons per year. Many of these, such as the chlorinated solvents, are environmentally unfriendly; others, such as the ethylene glycol ethers and N Methyl Pyrrolidone (NMP), are toxic or teratogenic, and many other petroleum-derived solvents are …
Date:
February 8, 2010
Creator:
Snyder, S. W.
Object Type:
Report
System:
The UNT Digital Library
Advanced Pattern Material for Investment Casting Applications
Cleveland Tool and Machine (CTM) of Cleveland, Ohio in conjunction with Harrington Product Development Center (HPDC) of Cincinnati, Ohio have developed an advanced, dimensionally accurate, temperature-stable, energy-efficient and cost-effective material and process to manufacture patterns for the investment casting industry. In the proposed technology, FOPAT (aFOam PATtern material) has been developed which is especially compatible with the investment casting process and offers the following advantages: increased dimensional accuracy; increased temperature stability; lower cost per pattern; less energy consumption per pattern; decreased cost of pattern making equipment; decreased tooling cost; increased casting yield. The present method for investment casting is "the lost wax" process, which is exactly that, the use of wax as a pattern material, which is then melted out or "lost" from the ceramic shell. The molten metal is then poured into the ceramic shell to produce a metal casting. This process goes back thousands of years and while there have been improvements in the wax and processing technology, the material is basically the same, wax. The proposed technology is based upon an established industrial process of "Reaction Injection Molding" (RIM) where two components react when mixed and then "molded" to form a part. The proposed technology has been …
Date:
February 8, 2006
Creator:
Chaudhry, F. Douglas Neece Neil
Object Type:
Report
System:
The UNT Digital Library
The Advantages of Fixed Facilities in Characterizing TRU Wastes
In May 1998 the Hanford Site started developing a program for characterization of transuranic (TRU) waste for shipment to the Waste Isolation Pilot Plant (WIPP) in New Mexico. After less than two years, Hanford will have a program certified by the Carlsbad Area Office (CAO). By picking a simple waste stream, taking advantage of lessons learned at the other sites, as well as communicating effectively with the CAO, Hanford was able to achieve certification in record time. This effort was further simplified by having a centralized program centered on the Waste Receiving and Processing (WRAP) Facility that contains most of the equipment required to characterize TRU waste. The use of fixed facilities for the characterization of TRU waste at sites with a long-term clean-up mission can be cost effective for several reasons. These include the ability to control the environment in which sensitive instrumentation is required to operate and ensuring that calibrations and maintenance activities are scheduled and performed as an operating routine. Other factors contributing to cost effectiveness include providing approved procedures and facilities for handling hazardous materials and anticipated contingencies and performing essential evolutions, and regulating and smoothing the work load and environmental conditions to provide maximal efficiency …
Date:
February 8, 2000
Creator:
FRENCH, M.S.
Object Type:
Article
System:
The UNT Digital Library
Aerodynamic Investigation of a Parabolic Body of Revolution at Mach Number of 1.92 and Some Effects of an Annular Jet Exhausting From the Base
Report discussing an investigation of a parabolic body of revolution with and without the effects of an annular jet exhausting from the base. The aerodynamic characteristics, pressures, lift-curve slope, and other characteristics with the jet in operation and inoperative were compared.
Date:
February 8, 1950
Creator:
Love, Eugene S.
Object Type:
Report
System:
The UNT Digital Library
Afghanistan: Post-Taliban Governance, Security, and U.S. Policy
This report discusses the current political state of Afghanistan, focusing particularly on the influence of the Taliban and other militant groups and on the leadership of Afghan President Hamid Karzai. This report also discusses the U.S.-Afghanistan relationship, in both the short and long term, and U.S. efforts under the Obama Administration to provide military, reconstructive, and stabilization aid.
Date:
February 8, 2013
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Agriculture: A List of Websites
This list provides a sampling of the rapidly proliferating number of agricultural resources available on the Internet. It is not intended to be exhaustive. It is divided into 24 main categories and 15 subcategories.
Date:
February 8, 2001
Creator:
Canada, Carol
Object Type:
Report
System:
The UNT Digital Library
Aluminosilicate Formation in High Level Waste Evaporators: A Mechanism for Uranium Accumulation
High level waste Evaporators at the Savannah River Site (SRS) process radioactive waste to concentrate supernate and thus conserve tank space. In June of 1997, difficulty in evaporator operation was initially observed. This operational difficulty evidenced itself as a plugging of the evaporator's gravity drain line (GDL). The material blocking the GDL was determined to be a sodium aluminosilicate. Following a mechanical cleaning of the GDL, the evaporator was returned to service until October 1999. At this time massive deposits were discovered in the evaporator pot. As a result of the changes in evaporator chemistry and the resulting formation of aluminosilicate deposits in the evaporator, a comprehensive research and development program has been undertaken. This program is underway in order to assist in understanding the new evaporator chemistry and gain insight into the deposition phenomena. Key results from testing in FY01 have demonstrated that the chemistry of the evaporator feed favors aluminosilicate formation. Both the reaction kinetics and particle growth of the aluminosilicate material under SRS evaporator conditions has been demonstrated to occur within the residence times utilized in the SRS evaporator operation. Batch and continuous-flow experiments at known levels of supersaturation have shown a significant correlation between the deposition …
Date:
February 8, 2002
Creator:
Wilmarth, W. R.
Object Type:
Article
System:
The UNT Digital Library
Analysis and testing of rupture of steam generator tubing with flaws.
A high-temperature (300 C), high-pressure (18 MPa), and high-leak rate (1500 L/min) facility, and a room temperature, high-pressure (52 MPa) test facility were used to test flawed steam generator tubes. Single and multiple rectangular flaws were fabricated by electro-discharge machining on the outside surface of the tubes. This paper briefly reviews analytical methods for predicting ligament rupture and unstable burst of tubes with single and multiple rectangular flaws. Test data are presented to validate the failure models. The ligament rupture pressure of specimens with multiple flaws predicted by an equivalent rectangular crack method agree fairly well with measured data.
Date:
February 8, 2001
Creator:
Majumdar, S.; Kasza, K. S.; Park, J. Y. & Hanna, J. A.
Object Type:
Article
System:
The UNT Digital Library
Analysis of Scalable Data-Privatization Threading Algorithms for Hybrid MPI/OpenMP Parallelization of Molecular Dynamics
None
Date:
February 8, 2012
Creator:
Kunaseth, M.; Richards, D. F.; Glosli, J. N.; Kalia, R. K.; Nakano, A. & Vashista, P.
Object Type:
Article
System:
The UNT Digital Library
Analytical and experimental investigation of the effects of compressor interstage air bleed on performance characteristics of a 13-stage axial-flow compressor
Air was bled over the fifth-and tenth-stage rotor-blade rows through ports designed to pass 11 and 9 percent of the inlet flow, respectively, at 80 percent speed. Along the rated operating line the maximum speed at which rotating stall was encountered was lowered by either of these bleeds, and the stall patterns below these speeds were altered so that no dangerous resonant rotor-blade bending vibrations were excited. The combination of the two bleeds completely eliminated rotating stall to at least 50 percent speed. The compressor-discharge weight flow was decreased only at intermediate speeds, and the overall pressure ratio was affected only at intermediate speeds, and the overall pressure ratio was affected only by the combination bleed at intermediate speeds. Fifth-stage bleed increased compressor efficiency at low speeds, and tenth-stage bleed decreased efficiency at intermediate speeds.
Date:
February 8, 1957
Creator:
Lucas, James G.; Geye, Richard P. & Calvert, Howard F.
Object Type:
Report
System:
The UNT Digital Library
Annotated Bibliography of Α-Furil Dioxime
None
Date:
February 8, 1956
Creator:
Banks, Charles V. & LaPlante, Joseph P.
Object Type:
Report
System:
The UNT Digital Library
Apalachicola-Chattahoochee-Flint (ACF) Drought: Federal Water Management Issues
This report
Date:
February 8, 2008
Creator:
Carter, Nicole T.; Corn, M. Lynne; Abel, Amy; Kaplan, Stan Mark; Buck, Eugene H.; Brougher, Cynthia et al.
Object Type:
Report
System:
The UNT Digital Library
Apparatus for Electrostatic-Magnetic Separation
Patent for an electrostatic-magnetic separator for separating particles in a mass.
Date:
February 8, 1910
Creator:
Sutton, Henry M.; Steele, Walter L. & Steele, Edwin G.
Object Type:
Patent
System:
The Portal to Texas History