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  Partner: UNT Libraries Government Documents Department
 Decade: 1990-1999
 Year: 1991
1989 Walker Branch Watershed Surveying and Mapping Including a Guide to Coordinate Transformation Procedures

1989 Walker Branch Watershed Surveying and Mapping Including a Guide to Coordinate Transformation Procedures

Date: January 1, 1991
Creator: Timmins, S.
Description: Walker Branch Watershed is a forested, research watershed marked throughout by a 264 ft grid that was surveyed in 1967 using the Oak Ridge National Laboratory (X-10) coordinate system. The Tennessee Valley Authority (TVA) prepared a contour map of the watershed in 1987, and an ARC/INFO{trademark} version of the TVA topographic map with the X-10 grid superimposed has since been used as the primary geographic information system (GIS) data base for the watershed. However, because of inaccuracies observed in mapped locations of some grid markers and permanent research plots, portions of the watershed were resurveyed in 1989 and an extensive investigation of the coordinates used in creating both the TVA map and ARC/INFO data base and of coordinate transformation procedures currently in use on the Oak Ridge Reservation was conducted. They determined that the positional errors resulted from the field orientation of the blazed grid rather than problems in mapmaking. In resurveying the watershed, previously surveyed control points were located or noted as missing, and 25 new control points along the perimeter roads were surveyed. In addition, 67 of 156 grid line intersections (pegs) were physically located and their positions relative to mapped landmarks were recorded. As a result, coordinates ...
Contributing Partner: UNT Libraries Government Documents Department
1991 Annual report to the National Science Foundation

1991 Annual report to the National Science Foundation

Date: December 1, 1991
Creator: unknown
Description: This report contains discussions by researcher of the center on the computation and visualization of geometric structures. Most of the research involves the following: development of research software; exploration of mathematical structures; and computational crystal growth.
Contributing Partner: UNT Libraries Government Documents Department
1991 annual report to the National Science Foundation

1991 annual report to the National Science Foundation

Date: December 1, 1991
Creator: unknown
Description: The Geometry Center research program has a number of different aspects, most of which involve longer term commitments, such as, development of research software, teams of individuals visually exploring mathematical structures and sponsoring of workshops. The Center is built on the research programs of its faculty. These programs have flourished and interacted under the Center umbrella. There are many interconnections and commonalities between the fields represented. Here, a summary of the research work of each of the faculty members. Some of the research topics are geometric calculus of variations, group theory, geometric algorithms, and computer graphics.
Contributing Partner: UNT Libraries Government Documents Department
1991 Technical progress report of the University of South Carolina`s High Energy Physics Group, February 1990--July 1991

1991 Technical progress report of the University of South Carolina`s High Energy Physics Group, February 1990--July 1991

Date: December 31, 1991
Creator: unknown
Description: The high energy physics group at the University of South Carolina includes five teaching faculty members, one research faculty member, and five graduate students. Profs. Childers, Darden, and Wilson devote most of their research effort to Fermilab experiment E789, which is designed to observe charmless two-body decays of b-flavored mesons and baryons. Prof. Wilson works on Fermilab experiment E687 which studies charm physics in the wide-band photon beam. Profs. Rosenfeld and Wang participate in the AMY collaboration, which studies electron-positron interactions using the TRISTAN collider at KEK. Prof. Rosenfeld and one student collaborate with personnel from KEK and INS, Tokyo, on an experiment to detect a 17 keV neutrino in the {beta}-decay spectrum of {sup 63}Ni. Members of the group also participate in Fermilab Proposal P803 which will search for the oscillation of muon neutrino to tau neutrino with sensitivity better than a factor of 40 than previously achieved and in Superconducting Super Collider activities which include the development of an imaging preradiator. A brief discussion is given on progress made for each program.
Contributing Partner: UNT Libraries Government Documents Department
The 1992 World Administrative Radio Conference: Issues for U.S. International Spectrum Policy

The 1992 World Administrative Radio Conference: Issues for U.S. International Spectrum Policy

Date: November 1991
Creator: United States. Congress. Office of Technology Assessment.
Description: This report examines the U.S. preparations process for WARC-92, highlighting efforts to integrate the needs and concerns of various interest groups. It also reviews the forces and trends affecting the United States as it approaches WARC-92, and is intended to inform future congressional oversight of the domestic and international radio communication policy process.
Contributing Partner: UNT Libraries Government Documents Department
32nd Annual Report

32nd Annual Report

Date: January 1991
Creator: United States. Advisory Commission on Intergovernmental Relations.
Description: The ACIR Library is composed of publications that study the interactions between different levels of government. This document is an annual report.
Contributing Partner: UNT Libraries Government Documents Department
Actinide transport in Topopah Spring Tuff: Pore size, particle size, and diffusion

Actinide transport in Topopah Spring Tuff: Pore size, particle size, and diffusion

Date: April 1, 1991
Creator: Buchholtz ten Brink, M.; Phinney, D.L. & Smith, D.K.
Description: Diffusive transport rates for aqueous species in a porous medium are a function of sorption, molecular diffusion, and sample tortuosity. With heterogeneous natural samples, an understanding of the effect of multiple transport paths and sorption mechanisms is particularly important since a small amount of radioisotope traveling via a faster-than-anticipated transport path may invalidate the predictions of transport codes which assume average behavior. Static-diffusion experiments using aqueous {sup 238}U tracer in tuff indicated that U transport was faster in regions of greater porosity and that apparent diffusion coefficients depended on the scale (m or {mu}m) over which concentration gradients were measured in Topopah Spring Tuff. If a significant fraction of actinides in high-level waste are released to the environment in forms that do not sorb to the matrix, they may be similarly transported along fast paths in porous regions of the tuff. To test this, aqueous diffusion rates in tuff were measured for {sub 238}U and {sub 239}Pu leached from doped glass. Measured transport rates and patterns were consistent in both systems with a dual-porosity transported moeld. In addition, filtration or channelling of actinides associated with colloidal particles may significantly affect the radionuclide transport rate in Topopah Spring tuff. 9 refs., ...
Contributing Partner: UNT Libraries Government Documents Department
Activities and Operations of Argonne's Advanced Computing Research Facility : February 1990 through April 1991

Activities and Operations of Argonne's Advanced Computing Research Facility : February 1990 through April 1991

Date: May 1991
Creator: Pieper, Gail W.
Description: This report reviews the activities and operations of the Advanced Computing Research Facility (ACRF) from February 1990 through April 1991. The ACRF is operated by the Mathematics and Computer Science Division at Argonne National Laboratory. The facility's principal objective is to foster research in parallel computing. Toward this objective, the ACRF operates experimental advanced computers, supports investigations in parallel computing, and sponsors technology transfer efforts to industry and academia.
Contributing Partner: UNT Libraries Government Documents Department
Adjusting to a New Security Environment: The Defense Technology and Industrial Base Challenge

Adjusting to a New Security Environment: The Defense Technology and Industrial Base Challenge

Date: February 1991
Creator: United States. Congress. Office of Technology Assessment.
Description: This background paper, OTA sought information and advice from a broad spectrum of knowledgeable individuals and organizations whose contributions are gratefully acknowledged. As with all OTA studies, the content of this background paper is the sole responsibility of the Office of Technology Assessment and does not necessarily represent the views of our advisers and reviewers.
Contributing Partner: UNT Libraries Government Documents Department
Adolescent Health, Volume 1: Summary and Policy Options

Adolescent Health, Volume 1: Summary and Policy Options

Date: April 1991
Creator: United States. Congress. Office of Technology Assessment.
Description: This OTA’s report responds to the request of numerous Members of Congress to review the physical, emotional, and behavioral health status of contemporary American adolescents, including adolescents in groups who might be more likely to be in special need of health-related interventions: adolescents living in poverty, adolescents from racial and ethnic minority groups, Native American adolescents, and adolescents in rural areas. In addition, OTA was asked to: 1 ) identify risk and protective factors for adolescent health problems and integrate national data in order to understand the clustering of specific adolescent problems, 2) evaluate options in the organization of health services and technologies available to adolescents (including accessibility and financing), 3) assess options in the conduct of national health surveys to improve collection of adolescent health statistics, and 4) identify gaps in research on the health and behavior of adolescents.
Contributing Partner: UNT Libraries Government Documents Department
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