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2-D Simulations of Drainage Winds and Diffusion Compared to Observations
A vertically integrated dynamical drainage flow model is developed from conservation equations for momentum and mass in a terrain-following coordinate system. Wind fields from the dynamical model drive a Monte Carlo transport and diffusion model. The model needs only topographic data, an Eulerian or Lagrangian time scale and a surface drag coefficient for input data, and can be started with a motionless atmosphere. Model wind and diffusion predictions are compared to observations from the rugged Geysers CA area. Model winds generally agree with observed surface winds, and in some cases may give better estimates of area-averaged flow than point observations. Tracer gas concentration contours agree qualitatively with observed contours, and point predictions of maximum concentrations were correctly predicted to within factors of 2 to 10. Standard statistical tests of model skill showed that the accuracy of the predictions varied significantly from canyon to canyon in the Geysers are a. Model wind predictions are also compared to observations from the Savannah River Plant of SC which has gently rolling terrain. The model correctly simulated the slower development of drainage winds and slower deepening of the drainage layer in the Savannah River Valley, relative to the Geysers CA simulations. The SC simulations …
Date:
May 29, 2001
Creator:
Garrett, A. J.
Object Type:
Article
System:
The UNT Digital Library
Abstraction of Models for Pitting and Crevice Corrosion of Drip Shield and Waste Package Outer Barrier
This analyses and models report (AMR) was conducted in response to written work direction (CRWMS M and O 1999a). ICN 01 of this AMR was developed following guidelines provided in TWP-MGR-MD-000004 REV 01, ''Technical Work Plan for: Integrated Management of Technical Product Input Department'' (BSC 2001, Addendum B). The purpose and scope of this AMR is to review and analyze upstream process-level models (CRWMS M and O 2000a and CRWMS M and O 2000b) and information relevant to pitting and crevice corrosion degradation of waste package outer barrier (Alloy 22) and drip shield (Titanium Grade 7) materials, and to develop abstractions of the important processes in a form that is suitable for input to the WAPDEG analysis for long-term degradation of waste package outer barrier and drip shield in the repository. The abstraction is developed in a manner that ensures consistency with the process-level models and information and captures the essential behavior of the processes represented. Also considered in the model abstraction are the probably range of exposure conditions in emplacement drifts and local exposure conditions on drip shield and waste package surfaces. The approach, method, and assumptions that are employed in the model abstraction are documented and justified.
Date:
August 29, 2001
Creator:
Mon, K.
Object Type:
Report
System:
The UNT Digital Library
Age constraints on fluid inclusions in calcite at Yucca Mountain
The {sup 207}Pb/{sup 235}U ages for 14 subsamples of opal or chalcedony layers younger than calcite formed at elevated temperature range between 1.88 {+-} 0.05 and 9.7 {+-} 1.5 Ma with most values older than 6-8 Ma. These data indicate that fluids with elevated temperatures have not been present in the unsaturated zone at Yucca Mountain since about 1.9 Ma and most likely since 6-8 Ma. Discordant U-Pb isotope data for chalcedony subsamples representing the massive silica stage in the formation of the coatings are interpreted using a model of the diffusive loss of U decay products. The model gives an age estimate for the time of chalcedony formation around 10-11 Ma, which overlaps ages of clay minerals formed in tuffs below the water table at Yucca Mountain during the Timber Mountain thermal event.
Date:
April 29, 2001
Creator:
Neymark, Leonid A.; Amelin, Yuri V.; Paces, James B.; Peterman, Zell E. & Whelan, Joseph F.
Object Type:
Article
System:
The UNT Digital Library
Aging of Polyurethane Foam Insulation in Simulated Refrigerator Panels--Three-Year Results with Third-Generation Blowing Agents
Laboratory data are presented on the effect of constant-temperature aging on the apparent thermal conductivity of polyurethane foam insulation for refrigerators and freezers. The foam specimens were blown with HCFC-141b and with three of its potential replacements--HFC-134a, HFC-245fa, and cyclopentane. Specimens were aged at constant temperatures of 90 F, 40 F, and -10 F. Thermal conductivity measurements were made on two types of specimens: full-thickness simulated refrigerator panels containing foam enclosed between solid plastic sheets, and thin slices of core foam cut from similar panels. Results are presented for the first three years of a multi-year aging study. Preliminary comparisons of measured data with predictions of a mathematical aging model are presented.
Date:
May 29, 2001
Creator:
Wilkes, K. E.
Object Type:
Article
System:
The UNT Digital Library
Agriculture: Prospective Issues for the 107th Congress
Persistent low farm prices and 3 years of multi-billion dollar ad hoc additions to federal spending for farmers are expected to put pressure on the 107th Congress for an early review of federal farm policy. Farm policy is governed by a variety of laws, many of which are incorporated into an omnibus, multi-year farm bill. Most of the provisions of the current farm bill, the Federal Agricultural Improvement and Reform (FAIR) Act of 1996, expire after the 2002 crop year. Key issues are the responsiveness of current policy to low commodity prices and farm income, factors influencing low prices, and options for improving prices and/or providing automatic relief to farmers when prices fall. Increased concentration in the agriculture industry, trade, and environmental regulations affecting agriculture are likely to be part of the debate.
Date:
January 29, 2001
Creator:
Jones, Jean Yavis
Object Type:
Report
System:
The UNT Digital Library
AIDS in Africa
Sub-Saharan Africa has been far more severely affected by AIDS than any other part of the world. The United Nations reports that 25.3 million adults and children are infected with the HIV virus in the region, which has about 10% of the world's population but more than 70% of the worldwide total of infected people. This report discusses this issue in detail, including the cause of the African AIDS epidemic, the social and economic consequences, response and treatment, and U.S. policy.
Date:
October 29, 2001
Creator:
Copson, Raymond W.
Object Type:
Report
System:
The UNT Digital Library
Air Quality and Electricity: Initiatives to Increase Pollution Controls
This report discusses air quality initiatives (such as the Ozone Transport Rule) that primarily focus on reducing and enforcing emissions from coal-fired electric generating utilities in the Midwest and South.
Date:
March 29, 2001
Creator:
Parker, Larry & Blodgett, John E.
Object Type:
Report
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 125, No. 44, Ed. 1 Thursday, March 29, 2001
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
March 29, 2001
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
The Albany News (Albany, Tex.), Vol. 126, No. 27, Ed. 1 Thursday, November 29, 2001
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
November 29, 2001
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
An Algorithm for Projecting Points onto a Patched CAD Model
We are interested in building structured overlapping grids for geometries defined by computer-aided-design (CAD) packages. Geometric information defining the boundary surfaces of a computation domain is often provided in the form of a collection of possibly hundreds of trimmed patches. The first step in building an overlapping volume grid on such a geometry is to build overlapping surface grids. A surface grid is typically built using hyperbolic grid generation; starting from a curve on the surface, a grid is grown by marching over the surface. A given hyperbolic grid will typically cover many of the underlying CAD surface patches. The fundamental operation needed for building surface grids is that of projecting a point in space onto the closest point on the CAD surface. We describe an fast algorithm for performing this projection, it will make use of a fairly coarse global triangulation of the CAD geometry. We describe how to build this global triangulation by first determining the connectivity of the CAD surface patches. This step is necessary since it often the case that the CAD description will contain no information specifying how a given patch connects to other neighboring patches. Determining the connectivity is difficult since the surface patches …
Date:
May 29, 2001
Creator:
Henshaw, W D
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 101, No. 274, Ed. 1 Monday, January 29, 2001
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 29, 2001
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 102, No. 13, Ed. 1 Thursday, March 29, 2001
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 29, 2001
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 102, No. 39, Ed. 1 Sunday, April 29, 2001
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 29, 2001
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 102, No. 65, Ed. 1 Tuesday, May 29, 2001
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 29, 2001
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 102, No. 92, Ed. 1 Friday, June 29, 2001
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 29, 2001
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 102, No. 127, Ed. 1 Sunday, July 29, 2001
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 29, 2001
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 102, No. 154, Ed. 1 Wednesday, August 29, 2001
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 29, 2001
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 102, No. 206, Ed. 1 Monday, October 29, 2001
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 29, 2001
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 102, No. 233, Ed. 1 Thursday, November 29, 2001
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 29, 2001
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, August 29, 2001
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
August 29, 2001
Creator:
Schwind, Jim & Holton, Kathleen
Object Type:
Newspaper
System:
The Portal to Texas History
Alvin Sun-Advertiser (Alvin, Tex.), Vol. 110, No. 34, Ed. 1 Sunday, April 29, 2001
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
April 29, 2001
Creator:
Schwind, Jim & Holton, Kathleen
Object Type:
Newspaper
System:
The Portal to Texas History
Alvin Sun-Advertiser (Alvin, Tex.), Vol. 110, No. 61, Ed. 1 Sunday, July 29, 2001
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
July 29, 2001
Creator:
Schwind, Jim & Holton, Kathleen
Object Type:
Newspaper
System:
The Portal to Texas History
The Alvin Sun (Alvin, Tex.), Vol. 110, No. 9, Ed. 1 Monday, January 29, 2001
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
January 29, 2001
Creator:
Schwind, Jim & Holton, Kathleen
Object Type:
Newspaper
System:
The Portal to Texas History
The Alvin Sun (Alvin, Tex.), Vol. 110, No. 88, Ed. 1 Monday, October 29, 2001
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
October 29, 2001
Creator:
Schwind, Jim & Holton, Kathleen
Object Type:
Newspaper
System:
The Portal to Texas History