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449 Matching Results
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Labeling of Genetically Modified Foods
Congressional interest in the labeling of genetically modified foods (GM foods) has been rising. So far, two bills have been introduced to mandate that all foods from genetically modified crops (GM crops) be labeled as such. The Food and Drug Administration (FDA) issued its current GM food labeling policy in May 1992. At that time, the agency determined that it would regulate GM foods no differently than foods created by conventional means because FDA considered them substantially equivalent to traditional foods and decided that no special label would be needed. In the intervening period, extensive public debate surrounding the genetic modification of foods has led some consumers to call for labeling of such products. A label would permit customers to choose to avoid purchasing or consuming them. Others oppose labeling because to make such labels "truthful and not misleading" all commodities would need to be segregated and tested, and the label would not have room to impart information that could not be distributed in other ways. The federal government's role in regulating these foods is explained in CRS report RL30198, Food Biotechnology in the United States: Science, Regulation, and Issues. This report focuses specifically on views surrounding the labeling of …
Date:
March 20, 2000
Creator:
Vogt, Donna U. & Jackson, Brian A.
Object Type:
Report
System:
The UNT Digital Library
Management of super-grade plutonium in spent nuclear fuel
This paper examines the security and safeguards implications of potential management options for DOE's sodium-bonded blanket fuel from the EBR-II and the Fermi-1 fast reactors. The EBR-II fuel appears to be unsuitable for the packaging alternative because of DOE's current safeguards requirements for plutonium. Emerging DOE requirements, National Academy of Sciences recommendations, draft waste acceptance requirements for Yucca Mountain and IAEA requirements for similar fuel also emphasize the importance of safeguards in spent fuel management. Electrometallurgical treatment would be acceptable for both fuel types. Meeting the known requirements for safeguards and security could potentially add more than $200M in cost to the packaging option for the EBR-II fuel.
Date:
March 20, 2000
Creator:
McFarlane, H. F. & Benedict, R. W.
Object Type:
Article
System:
The UNT Digital Library
[Mentor Review for Oakhurst School Teachers: A Comprehensive Evaluation]
A document presenting a thorough mentor review for two teachers at Oakhurst School. Through a detailed assessment, it evaluates the professional development, teaching methodologies, and overall performance of the educators.
Date:
March 20, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
More monkeys on Mondays, twice the tigers on Tuesdays
News release about discounts on Dallas Zoo tickets with DART light rail tickets.
Date:
March 20, 2000
Creator:
Lyons, Morgan
Object Type:
Text
System:
The Portal to Texas History
The Oklahoma Daily (Norman, Okla.), Vol. 84, No. 124, Ed. 1 Monday, March 20, 2000
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
March 20, 2000
Creator:
Wilmoth, Adam
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 107, No. 56, Ed. 1 Monday, March 20, 2000
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 20, 2000
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Quantitative analysis of hydrogen gas formed by aqueous corrosion of metallic uranium
Three unirradiated EBR-II blanket fuel samples containing depleted uranium metal were corrosion tested in simulated J-13 well water at 90 C. The corrosion rate of the blanket uranium metal was then determined relative to H{sub 2} formation. Corrosion of one of the samples was interrupted prior to complete oxidation of the uranium metal and the solid corrosion product was analyzed for UO{sub 2} and UH{sub 3}.
Date:
March 20, 2000
Creator:
Fonnesbeck, J.
Object Type:
Article
System:
The UNT Digital Library
A quick guide to solar electricity
A small brochure about solar electricity for the general public to be handed out on Earth Day 2000.
Date:
March 20, 2000
Creator:
Poole, L.
Object Type:
Book
System:
The UNT Digital Library
Recent advances during the treatment of spent EBR-II fuel
Several recent advances have been achieved for the electrometallurgical treatment of spent nuclear fuel. In anticipation of production operations at Argonne National Laboratory-West, development of both electrorefining and metal processing has been ongoing in the post-demonstration phase in order to further optimize the process. These development activities show considerable promise. This paper discusses the results of recent experiments as well as plans for future investigations.
Date:
March 20, 2000
Creator:
Westphal, B. R.; Mariani, R. D.; Vaden, D. E.; Sherman, S. R.; Li, S. X. & Keiser, D. D. Jr.
Object Type:
Article
System:
The UNT Digital Library
Repository performance assessment of waste forms from the electrometallurgical treatment of sodium-bonded spent nuclear fuel
The ceramic and metal waste forms produced by electrometallurgical treatment of sodium-bonded spent nuclear fuel are undergoing evaluation as to how they will perform within the geologic repository which is proposed to be built at Yucca Mountain. An initial assessment, making use of preliminary degradation models for the waste forms, is described. The analyses are performed with a simplified version of the Total System Performance Assessment--Viability Assessment repository model. Results indicate that the ability of the ceramic and metal waste forms to retain radionuclides is similar to and sometimes better than defense high-level waste glass.
Date:
March 20, 2000
Creator:
Morris, E. E.; Fanning, T. H.; Feldman, E. E. & Petri, M. C.
Object Type:
Article
System:
The UNT Digital Library
Robot positioning based on point-to-point motion capability
This paper presents an optimal search method for determining the base location of a robot manipulator so that the robot can have a designated point-to-point (PTP) motion capabilities. Based on the topological characterization of the manipulator workspace and the definitions of various p-connectivity, a computational method is developed for enumerating various PTP motion capabilities into quantitative cost functions. Then an unconstrained search by minimizing the cost function yields the task feasible location of the robot base. This methodology is useful for placement of mobile manipulators and robotic workcell layout design.
Date:
March 20, 2000
Creator:
Park, Y. S.; Cho, H. S. & Koh, K. C.
Object Type:
Article
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 84, No. 161, Ed. 1 Monday, March 20, 2000
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 20, 2000
Creator:
Quinnelly, Lorrie J.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Synthesis and characterization of a new microporous cesium silicotitanate (SNL-B) molecular sieve
Ongoing hydrothermal Cs-Ti-Si-O-H{sub 2}O phase investigations has produced several new ternary phases including a novel microporous Cs-silicotitanate molecular sieve, SNL-B with the approximate formula of Cs{sub 3}TiSi{sub 3}O{sub 9.5}{center_dot}3H{sub 2}O. SNL-B is only the second molecular sieve Cs-silicotitanate phase reported to have been synthesized by hydrothermal methods. Crystallites are very small (0.1 x 2 microns) with a blade-like morphology. SNL-B is confirmed to be a 3-dimensional molecular sieve by a variety of characterization techniques (N{sub 2} adsorption, ion exchange, water adsorption/desorption, solid state CP-MAS NMR). SNL-B is able to desorb and adsorb water from its pores while retaining its crystal structure and exchanges Cs cations readily. Additional techniques were used to describe fundamental properties (powder X-ray diffraction, FTIR, {sup 29}Si and {sup 133}/Cs MAS NMR, DTA, SEM/EDS, ion selectivity, and radiation stability). The phase relationships of metastable SNL-B to other hydrothermally synthesized Cs-Ti-Si-O-H{sub 2}O phases are discussed, particularly its relationship to a Cs-silicotitanate analogue of pharmacosiderite, and a novel condensed phase, a polymorph of Cs{sub 2}TiSi{sub 6}O{sub 15}(SNL-A).
Date:
March 20, 2000
Creator:
Nyman, May D.; Gu, B. X.; Wang, L. M.; Ewing, R. C. & Nenoff,Tina M.
Object Type:
Article
System:
The UNT Digital Library
Time horizon for AFV emission savings under Tier 2
Implementation of the Federal Tier 2 vehicular emission standards according to the schedule presented in the December, 1999 Final Rule will result in substantial reductions of NMHC, CO, NO{sub x}, and fine particle emissions from motor vehicles. Currently, when compared to Tier 1 and even NLEV certification requirements, the emissions performance of automobiles and light-duty trucks powered by non-petroleum (especially, gaseous) fuels (i.e., vehicles collectively termed AFVs) enjoy measurable advantage over their gasoline- and diesel-fueled counterparts over the full Federal Test Procedure and, especially, in Bag 1 (cold start). For the lighter end of these vehicle classes, this advantage may disappear shortly after 2004 under the new standards, but should continue for a longer period (perhaps beyond 2008) for the heavier end as well as for heavy-duty vehicles relative to diesel-fueled counterparts. Because of the continuing commitment of the U.S. Department of Energy's Clean Cities coalitions to the acquisition and operation of AFVs of many types and size classes, it is important for them to know in which classes their acquisitions will remain clear relative to the petroleum-fueled counterparts they might otherwise procure. This paper provides an approximate timeline for and expected magnitude of such savings, assuming that full implementation …
Date:
March 20, 2000
Creator:
Saricks, C. L.
Object Type:
Article
System:
The UNT Digital Library
Two-phase flow and transport in the air cathode of proton exchange membrane fuel cells
Two-phase flow and transport of reactants and products in the air cathode of proton exchange membrane (PEM) fuel cells is studied analytically and numerically. Four regimes of water distribution and transport are classified by defining three threshold current densities and a maximum current density. They correspond to first appearance of liquid water at the membrane/cathode interface, extension of the gas-liquid two-phase zone to the cathode/channel interface, saturated moist air exiting the gas channel, and complete consumption of oxygen by the electrochemical reaction. When the cell operates above the first threshold current density, liquid water appears and a two-phase zone forms within the porous cathode. A two-phase, multi-component mixture model in conjunction with a finite-volume-based computational fluid dynamics (CFD) technique is applied to simulate the cathode operation in this regime. The model is able to handle the situation where a single-phase region co-exists with a two-phase zone in the air cathode. For the first time, the polarization curve as well as water and oxygen concentration distributions encompassing both single- and two-phase regimes of the air cathode are presented. Capillary action is found to be the dominant mechanism for water transport inside the two-phase zone. The liquid water saturation within the cathode …
Date:
March 20, 2000
Creator:
Wang, Z. H.; Wang, C. Y. & Chen, Ken S.
Object Type:
Article
System:
The UNT Digital Library
Usuarios de DART ahorrarán desde abril 50% en la admisión al Zoológico los lunes y martes
News release about discounts on Dallas Zoo tickets with DART light rail tickets.
Date:
March 20, 2000
Creator:
Lyons, Morgan
Object Type:
Text
System:
The Portal to Texas History
VUV absorption spectroscopy measurements of the role of fast neutral atoms in high-power gap breakdown
The maximum power achieved in a wide variety of high-power devices, including electron and ion diodes, z pinches, and microwave generators, is presently limited by anode-cathode gap breakdown. A frequently-discussed hypothesis for this effect is ionization of fast neutral atoms injected throughout the anode-cathode gap during the power pulse. The authors describe a newly-developed diagnostic tool that provides the first direct test of this hypothesis. Time-resolved vacuum-ultraviolet absorption spectroscopy is used to directly probe fast neutral atoms with 1 mm spatial resolution in the 10 mm anode-cathode gap of the SABRE 5 MV, 1 TW applied-B ion diode. Absorption spectra collected during Ar RF glow discharges and with CO{sub 2} gas fills confirm the reliability of the diagnostic technique. Throughout the 50--100 ns ion diode pulses no measurable neutral absorption is seen, setting upper limits of 0.12--1.5 x 10{sup 14} cm{sup {minus}3} for ground state fast neutral atom densities of H, C, N, O, F. The absence of molecular absorption bands also sets upper limits of 0.16--1.2 x 10{sup 15} cm{sup {minus}3} for common simple molecules. These limits are low enough to rule out ionization throughout the gap as a breakdown mechanism. This technique can now be applied to quantify …
Date:
March 20, 2000
Creator:
Filuk, A. B.; Bailey, James E.; Cuneo, Michael E.; Lake, Patrick Wayne; Nash, Thomas J.; Noack, Donald D. et al.
Object Type:
Article
System:
The UNT Digital Library