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362 Matching Results
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Polychlorinated Biphenyls (PCBs) in Catfish and Carp Collected from the Rio Grande Upstream and Downstream of Los Alamos National Laboratory: Revision 1
Concern has existed for years that the Los Alamos National Laboratory (LANL), a complex of nuclear weapons research and support facilities, has released polychlorinated biphenyls (PCBs) to the environment that may have reached adjacent bodies of water through canyons that connect them. In 1997, LANL's Ecology Group began measuring PCBs in fish in the Rio Grande upstream and downstream of ephemeral streams that cross LANL and later began sampling fish in Abiquiu and Cochiti reservoirs, which are situated on the Rio Chama and Rio Grande upstream and downstream of LANL, respectively. In 2002, we electroshocked channel catfish (Ictalurus punctatus) and common carp (Carpiodes carpio) in the Rio Grande upstream and downstream of LANL and analyzed fillets for PCB congeners. We also sampled soils along the Rio Chama and Rio Grande drainages to discern whether a background atmospheric source of PCBs that could impact surface water adjacent to LANL might exist. Trace concentrations of PCBs measured in soil (mean = 4.7E-05 {micro}g/g-ww) appear to be from background global atmospheric sources, at least in part, because the bimodal distribution of low-chlorinated PCB congeners and mid-chlorinated PCB congeners in the soil samples is interpreted to be typical of volatilized PCB congeners that are …
Date:
May 12, 2008
Creator:
Fresquez, Gilbert J. Gonzales Philip R.
Object Type:
Report
System:
The UNT Digital Library
A time dependent fractional coverage model for the adsorption and removal of gas species and application to the friction behavior of superlow friction DLC.
The frictional behavior of diamond-like carbon (DLC) films varies with environmental condition. One theory asserts that the cause of variations in the frictional performance is environmental contaminants adsorbing onto the DLC film surface. Testing of the frictional performance of DLC films in a pin-on-disk contact has mapped the transient behavior of the friction coefficient. A model for fractional coverage, based on the adsorption of environmental contaminants and their removal through the pin contact, is developed. The rate of adsorption is taken from Langmuir's model [1], which is combined with the removal rate from Blanchet and Sawyer [2]. The coefficient of friction is based on the average fractional coverage under the pin contact. The model also gives a closed-form expression for the steady-state fractional coverage. Model calculations compared favorably to the time progression of the friction coefficient for a series of earlier experiments on a superlow friction DLC coating [3], when the fractional removal term was allowed to increase with increasing sliding speed.
Date:
March 12, 2002
Creator:
Frysz, P. L.; Sawyer, W. G. & Erdemir, A.
Object Type:
Article
System:
The UNT Digital Library
Supernova/Acceleration Probe: A Satellite Experiment to Study the Nature of the Dark Energy
The Supernova/Acceleration Probe (SNAP) is a proposed space-based experiment designed to study the dark energy and alternative explanations of the acceleration of the Universes expansion by performing a series of complementary systematics-controlled astrophysical measurements. We here describe a self-consistent reference mission design that can accomplish this goal with the two leading measurement approaches being the Type Ia supernova Hubble diagram and a wide-area weak gravitational lensing survey. This design has been optimized to first order and is now under study for further modification and optimization. A 2-m three-mirror anastigmat wide-field telescope feeds a focal plane consisting of a 0.7 square-degree imager tiled with equal areas of optical CCDs and near infrared sensors, and a high efficiency low-resolution integral field spectrograph. The instrumentation suite provides simultaneous discovery and light-curve measurements of supernovae and then can target individual objects for detailed spectral characterization. The SNAP mission will discover thousands of Type Ia supernovae out to z = 3 and will obtain high-signal-to-noise calibrated light-curves and spectra for a subset of > 2000 supernovae at redshifts between z = 0.1 and 1.7 in a northern field and in a southern field. A wide-field survey covering one thousand square degrees in both northern and …
Date:
May 12, 2004
Creator:
Aldering, G.; Althouse, W.; Amanullah, R.; Annis, J.; Astier, P.; Baltay, C. et al.
Object Type:
Article
System:
The UNT Digital Library
COMMISSIONING OF RHIC DEUTERON - GOLD COLLISIONS.
Deuteron and gold beams have been accelerated to a collision energy of {radical}s = 200 GeV/u in the Relativistic Heavy Ion Collider (RHIC), providing the first asymmetric-species collisions of this complex. Necessary changes for this mode of operation include new ramping software and asymmetric crossing angle geometries. This paper reviews machine performance, problem encountered and their solutions, and accomplishments during the 16 weeks of ramp-up and operations.
Date:
May 12, 2003
Creator:
SATOGATA,T. AHRENS,L. BAI,M. BEEBE-WANG,J.
Object Type:
Article
System:
The UNT Digital Library
Summary of Hanford Site Groundwater Monitoring for Fiscal Year 2003
This document is a summary of the larger report, PNNL-14548. It describes the groundwater monitoring results for FY 2003 at the Hanford Site in southeast Washington State. The Hanford Site, a facility in the U.S. Department of Energy (DOE) nuclear weapons complex, encompasses {approx}1,517 square kilometers northwest of the city of Richland along the Columbia River in southeast Washington State. The federal government acquired the site in 1943, and until the 1980s it was dedicated primarily to the production of plutonium for national defense and the management of resulting waste. In 1995, all unrestricted discharge of radioactive liquid waste to the ground was discontinued. Today, DOE's mission on the Hanford Site is to restore the Columbia River corridor and transition the central portion of the site toward its long-term waste management role. DOE has monitored groundwater on the Hanford Site since the 1940s to help determine what chemical and radiological contaminants have made their way into the groundwater. As regulatory requirements for monitoring increased in the 1980s, there began to be some overlap between various programs. DOE established the Groundwater Performance Assessment Project (groundwater project) in 1996 to ensure protection of the public and the environment while improving the efficiency …
Date:
April 12, 2004
Creator:
Hartman, Mary J.; Morasch, Launa F. & Webber, William D.
Object Type:
Report
System:
The UNT Digital Library
Hanford Site Groundwater Monitoring for Fiscal Year 2003
This report presents the results of groundwater and vadose zone monitoring and remediation for fiscal year 2003 (October 2002 through September 2003) on the U.S. Department of Energy's Hanford Site, Washington. The most extensive contaminant plumes in groundwater are tritium, iodine-129, and nitrate, which all had multiple sources and are very mobile in groundwater. The largest portions of these plumes are migrating from the central Hanford Site to the southeast, toward the Columbia River. Concentrations of tritium, nitrate, and some other contaminants continued to exceed drinking water standards in groundwater discharging to the river in some locations. However, contaminant concentrations in river water remained low and were far below standards. Carbon tetrachloride and associated organic constituents form a relatively large plume beneath the central part of the Hanford Site. Hexavalent chromium is present in smaller plumes beneath the reactor areas along the river and beneath the central part of the site. Strontium-90 exceeds standards beneath all but one of the reactor areas, and technetium-99 and uranium are present in the 200 Areas. Uranium exceeds standards in the 300 Area in the south part of the Hanford Site. Minor contaminant plumes with concentrations greater than standards include carbon-14, cesium-137, cis-1,2-dichloroethene, cyanide, …
Date:
April 12, 2004
Creator:
Hartman, Mary J.; Morasch, Launa F. & Webber, William D.
Object Type:
Report
System:
The UNT Digital Library
Aquatic Ecosystem Enhancement at Mountaintop Mining Sites Symposium
Welcome to this symposium which is part of the ongoing effort to prepare an Environmental Impact Statement (EIS) regarding mountaintop mining and valley fills. The EIS is being prepared by the U.S. Environmental Protection Agency, U.S. Army Corps of Engineers, U.S. Office of Surface Mining, and U.S. Fish and Wildlife Service, in cooperation with the State of West Virginia. Aquatic Ecosystem Enhancement (AEE) at mountaintop mining sites is one of fourteen technical areas identified for study by the EIS Interagency Steering Committee. Three goals were identified in the AEE Work Plan: 1. Assess mining and reclamation practices to show how mining operations might be carried out in a way that minimizes adverse impacts to streams and other environmental resources and to local communities. Clarify economic and technical constraints and benefits. 2. Help citizens clarify choices by showing whether there are affordable ways to enhance existing mining, reclamation, mitigation processes and/or procedures. 3. Ide identify data needed to improve environmental evaluation and design of mining projects to protect the environment. Today’s symposium was proposed in the AEE Team Work Plans but coordinated planning for the event began September 15, 1999 when representatives from coal industry, environmental groups and government regulators met …
Date:
January 12, 2000
Creator:
Black, D. Courtney; Lawson, Peter; Morgan, John; Maggard, Randy; Schor, Horst; Powell, Rocky et al.
Object Type:
Article
System:
The UNT Digital Library
Characterization of Vadose Zone Sediment: Slant Borehole SX-108 in the S-SX Waste Management Area
The overall goal of the Tank Farm Vadose Zone Project, led by CH2M HILL Hanford Group, Inc., is to define risks from past and future single-shell tank farm activities. To meet this goal, CH2M HILL Hanford Group, Inc., asked scientists from Pacific Northwest National Laboratory to perform detailed analyses on vadose zone sediment from within the S-SX Waste Management Area. This report is the fourth in a series of four reports to present the results of these analyses. Specifically, this fourth report contains all the geologic, geochemical, and selected physical characterization data collected on vadose zone sediment recovered from the slant borehole installed beneath tank 241-SX-108 (or simply SX-108 slant borehole). This report also presents our interpretation of the data in the context of determining the appropriate lithologic model, the vertical extent of contamination, the migration potential of the contaminants that still reside in the vadose zone, and the correspondence of the contaminant distribution in the borehole sediment in relationship to groundwater plumes in the aquifer proximate and downgradient from the SX Tank Farm.
Date:
February 12, 2002
Creator:
Serne, R. Jeffrey; Last, George V.; Schaef, Herbert T.; Lanigan, David C.; Lindenmeier, Clark W.; Ainsworth, Calvin C. et al.
Object Type:
Report
System:
The UNT Digital Library
Lexington Leader (Lexington, Tex.), Vol. 13, No. 568, Ed. 1 Thursday, March 12, 2009
Weekly newspaper from Lexington, Texas that includes local, state, and national news along with advertising.
Date:
March 12, 2009
Creator:
Terrell, Cindy
Object Type:
Newspaper
System:
The Portal to Texas History
BRAC Analysis - Notes and Research
Contains notes and research from Air Force Team Analyst Craig Hall regarding Air Guard and Reserve issues (Part #1 of 2)
Date:
December 12, 2005
Creator:
United States. Defense Base Closure and Realignment Commission.
Object Type:
Text
System:
The UNT Digital Library
Jewish Herald-Voice (Houston, Tex.), Vol. 101, No. 35, Ed. 1 Thursday, November 12, 2009
Weekly Jewish newspaper from Houston, Texas that includes local, state and national news along with extensive advertising.
Date:
November 12, 2009
Creator:
Samuels, Jeanne F.
Object Type:
Newspaper
System:
The Portal to Texas History
On The Use Of Models To Assess Foot-And-Mouth Disease Transmission And Control
The 2001 outbreaks of foot-and-mouth disease (FMD) in Europe (Ferguson et al. 2001a, 2001b; Bouma et al. 2003) and concern about the possibility of an intentional introduction of a devastating foreign animal disease triggered renewed interest in both theoretical and experimental research related to FMD. Theoretical models of disease transmission, which influenced the tactical decisions of the United Kingdom (UK) government during the epidemic (Taylor 2003), resulted in large numbers of uninfected animals being slaughtered. After the epidemic, the adopted control policies were sharply criticized (Kitching 2004;, Taylor 2003). Still, the role of computationaL modeling for analyzing the scope of the epidemic and devising control strategies was recognized as substantial and necessary.
Date:
July 12, 2004
Creator:
Kostova-Vassilevska, Tanya
Object Type:
Report
System:
The UNT Digital Library
Port Aransas South Jetty (Port Aransas, Tex.), Vol. 35, No. 19, Ed. 1 Thursday, May 12, 2005
Weekly newspaper from Port Aransas, Texas on Mustang Island that includes local, state and national news along with extensive advertising.
Date:
May 12, 2005
Creator:
Judson, Mary Henkel
Object Type:
Newspaper
System:
The Portal to Texas History
The ICF Status and Plans in the United States
The United States continues to maintain its leadership in ICF as it moves toward the goal of ignition. The flagship of the program is the National Ignition Facility (NIF) presently under construction at LLNL. Experiments had begun on the first four beams of the National Ignition Facility just at the time of the last IFSA Conference. Several new successful campaigns have been conducted since then in planar hydrodynamics and hohlraums as well as activating the VISAR diagnostic for equation of state experiments. Highlights of these results will be reviewed. Presently, the four beam experimental capability has been suspended while the first eight beams are being installed as the first step in building out the project. Meanwhile, much progress has been made in developing ignition designs for using NIF. An array of designs having several ablator materials have been shown computationally to ignite with energies ranging from the design energy to as low as 1 MJ of laser energy. Alternative direct drive designs in the NIF indirect drive configuration have been developed by LLE. This wide array of design choices has increased the chance of achieving ignition sooner on the facility. Plans are now being developed to begin an ignition experimental …
Date:
October 12, 2005
Creator:
Moses, E.; Miller, G. & Kauffman, R.
Object Type:
Article
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 93, No. 28, Ed. 1 Thursday, July 12, 2001
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
July 12, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Albany News (Albany, Tex.), Vol. 134, No. 25, Ed. 1 Thursday, November 12, 2009
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
November 12, 2009
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
Stamford American (Stamford, Tex.), Vol. 82, No. 25, Ed. 1 Thursday, September 12, 2002
Weekly newspaper from Stamford, Texas that includes local, state, and national news along with advertising.
Date:
September 12, 2002
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 126, No. 47, Ed. 1 Thursday, June 12, 2008
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
June 12, 2008
Creator:
Reddell, Valerie
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 93, No. 15, Ed. 1 Thursday, April 12, 2001
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
April 12, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Perry Daily Journal (Perry, Okla.), Vol. 111, No. 29, Ed. 1 Thursday, February 12, 2004
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 12, 2004
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Levelland and Hockley County News-Press (Levelland, Tex.), Vol. 26, No. 56, Ed. 1 Sunday, October 12, 2003
Semiweekly newspaper from Levelland, Texas that includes local, state, and national news along with advertising.
Date:
October 12, 2003
Creator:
Rigg, John
Object Type:
Newspaper
System:
The Portal to Texas History
Upstream Migration of Pacific Lampreys in the John Day River : Behavior, Timing, and Habitat Use : Annual Report 2000.
Historic accounts and recent observations of Pacific lampreys (Lampetra tridentata) at mainstem Columbia River dams indicate the number of Pacific lampreys migrating upriver has decreased dramatically over the last 60 years. Consequently, state, federal, and tribal governments have recently expressed concern for this species. Little is known about the biological and ecological characteristics of habitats suitable for upstream migrating Pacific lampreys. If rehabilitation efforts are to be done effectively and efficiently, we must gain knowledge of factors limiting survival and reproduction of Pacific lampreys. From data gathered in the first year of this project, we can for the first time, describe the timing, extent, and patterns of movements for Pacific lampreys. We have tested methods and gained information that will allow us to refine our objectives and approach in future work. Knowledge of behavior, timing, and the resulting quantification of habitat use will provide a means to assess the suitability of overwintering and spawning habitats and allow the establishment of goals for recovery projects. Further research is necessary, including multiple years of data collection, tracking of movement patterns through the spawning season, and more rigorously examining habitat use.
Date:
April 12, 2001
Creator:
Bayer, Jennifer M.; Seelye, James G. & Robinson, T. Craig
Object Type:
Report
System:
The UNT Digital Library
The Optimist (Abilene, Tex.), Vol. 93, No. 24, Ed. 1, Friday, November 12, 2004
Weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
November 12, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 82, No. 41, Ed. 1 Monday, January 12, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
January 12, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History