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Pressure dependence of the optical properties of the charge-density-wave compound LaTe2
We report the pressure dependence of the optical response of LaTe{sub 2}, which is deep in the charge-density-wave (CDW) ground state even at 300 K. The reflectivity spectrum is collected in the mid-infrared spectral range at room temperature and at pressures between 0 and 7 GPa. We extract the energy scale due to the single particle excitation across the CDW gap and the Drude weight. We establish that the gap decreases upon compressing the lattice, while the Drude weight increases. This signals a reduction in the quality of nesting upon applying pressure, therefore inducing a lesser impact of the CDW condensate on the electronic properties of LaTe{sub 2}. The consequent suppression of the CDW gap leads to a release of additional charge carriers, manifested by the shift of weight from the gap feature into the metallic component of the optical response. On the contrary, the power-law behavior, seen in the optical conductivity at energies above the gap excitation and indicating a weakly interacting limit within the Tomonaga-Luttinger liquid scenario, seems to be only moderately dependent on pressure.
Date:
December 14, 2009
Creator:
Lavagnini, M.; Sacchetti, A.; Degiorgi, L.; Arcangeletti, E.; Baldassarre, L.; Postorino, P. et al.
Object Type:
Article
System:
The UNT Digital Library
Proposals for a Commission to Address the Federal Government’s Long-Term Fiscal Situation
None
Date:
December 14, 2009
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
RECOMMENDATIONS FOR SAMPLING OF TANK 18 IN F TANK FARM
Representative sampling is required for characterization of the residual floor material in Tank 18 prior to operational closure. Tank 18 is an 85-foot diameter, 34-foot high carbon steel tank with nominal operating volume of 1,300,000 gallons. It is a Type IV tank, and has been in service storing radioactive materials since 1959. Recent mechanical cleaning of the tank removed all mounds of material. Anticipating a low level of solids in the residual material, Huff and Thaxton [2009] developed a plan to sample the material during the final clean-up process while it would still be resident in sufficient quantities to support analytical determinations in four quadrants of the tank. Execution of the plan produced fewer solids than expected to support analytical determinations in all four quadrants. Huff and Thaxton [2009] then restructured the plan to characterize the residual floor material separately in the North and the South regions: two 'hemispheres.' This document provides sampling recommendations to complete the characterization of the residual material on the tank bottom following the guidance in Huff and Thaxton [2009] to split the tank floor into a North and a South hemisphere. The number of samples is determined from a modification of the formula previously published …
Date:
December 14, 2009
Creator:
Shine, G.
Object Type:
Report
System:
The UNT Digital Library
RECOMMENDATIONS FOR SAMPLING OF TANK 19 IN F TANK FARM
Representative sampling is required for characterization of the residual material in Tank 19 prior to operational closure. Tank 19 is a Type IV underground waste storage tank located in the F-Tank Farm. It is a cylindrical-shaped, carbon steel tank with a diameter of 85 feet, a height of 34.25 feet, and a working capacity of 1.3 million gallons. Tank 19 was placed in service in 1961 and initially received a small amount of low heat waste from Tank 17. It then served as an evaporator concentrate (saltcake) receiver from February 1962 to September 1976. Tank 19 also received the spent zeolite ion exchange media from a cesium removal column that once operated in the Northeast riser of the tank to remove cesium from the evaporator overheads. Recent mechanical cleaning of the tank removed all mounds of material. Anticipating a low level of solids in the residual waste, Huff and Thaxton [2009] developed a plan to sample the waste during the final clean-up process while it would still be resident in sufficient quantities to support analytical determinations in four quadrants of the tank. Execution of the plan produced fewer solids than expected to support analytical determinations in all four quadrants. Huff …
Date:
December 14, 2009
Creator:
Harris, S. & Shine, G.
Object Type:
Report
System:
The UNT Digital Library
Reversible wetting of NaCl nanoparticles at relative humidities below deliquescence observed by environmental non-contact AFM
The behavior of NaCl nanoparticles as a function of relative humidity (RH) was characterized by depositing particles on a prepared hydrophobic surface and measuring their height via non-contact environmental atomic force microscopy (AFM). Non-contact AFM allows greater sensitivity to changes in the size of particles than does contact AFM or scanning electron microscopy, and greater sensitivity to changes in shape than do mass-based techniques. Crystalline cubic NaCl nanoparticles with sides of 35 to 150 nm were found to reversibly take up water with increasing RH, and to form a liquid-like surface layer of thickness 2 to 4 nm at humidities well below the deliquescence point of 75.0% at 20°C. Measurable uptake begins at 70% RH. The maximum thickness of the layer increases with increasing RH for a given particle size and, for a given RH, increases with increasing particle size over the range studied. The liquid-like behavior of the layer is indicated by a reversible “rounding” at the tops of the particles, where the ratio of particle height to radius of curvature increases from zero (flat top) at 68% RH to 0.7 at 74% RH. These observations suggest that a reorganization of mass occurs on the solid NaCl nanoparticle, and …
Date:
December 14, 2009
Creator:
Bruzewicz, D.A.; Lewis, E.; Ocko, B. M.; McGraw, R. L. & Schwartz, S. E.
Object Type:
Article
System:
The UNT Digital Library
A Review & Assessment of Current Operating Conditions Allowable Stresses in ASME Section III Subsection NH
The current operating condition allowable stresses provided in ASME Section III, Subsection NH were reviewed for consistency with the criteria used to establish the stress allowables and with the allowable stresses provided in ASME Section II, Part D. It was found that the S{sub o} values in ASME III-NH were consistent with the S values in ASME IID for the five materials of interest. However, it was found that 0.80 S{sub r} was less than S{sub o} for some temperatures for four of the materials. Only values for alloy 800H appeared to be consistent with the criteria on which S{sub o} values are established. With the intent of undertaking a more detailed evaluation of issues related to the allowable stresses in ASME III-NH, the availabilities of databases for the five materials were reviewed and augmented databases were assembled.
Date:
December 14, 2009
Creator:
Swindeman, R. W.
Object Type:
Report
System:
The UNT Digital Library
SALTSTONE 3QCY09 TCLP RESULTS
A Saltstone waste form was prepared in the Savannah River National Laboratory (SRNL) from a Tank 50H sample and Z-Area premix material for the third quarter of calendar year 2009 (3QCY09). After the prescribed 28 day cure, samples of the saltstone were collected, and the waste form was shown to meet the South Carolina Hazardous Waste Management Regulations (SCHWMR) R.61-79.261.24 and R.61-79.268.48(a) requirements for a nonhazardous waste form with respect to RCRA metals and underlying hazardous constituents. These analyses met all quality assurance specifications of USEPA SW-846. The Saltstone Production Facility (SPF) receives waste from Tank 50H for treatment. In the third quarter of the 2009 calendar year (3QCY09), Tank 50H accepted transfers of approximately 37 kgal from the Effluent Treatment Project (ETP) waste, approximately 5 kgal from Tank 710 - the H-Canyon General Purpose Evaporator, approximately 26 kgal from Tank 221H, approximately 319 kgal from the Modular Caustic Side Solvent Extraction Unit (MCU) Decontaminated Salt Solution Hold Tank (DSS-HT), and approximately 358 kgal from Tank 23H. The Saltstone Grout Sampling plan provides the South Carolina Department of Health and Environmental Control (SCDHEC) with the chemical and physical characterization strategy for the salt solution which is to be disposed of …
Date:
December 14, 2009
Creator:
Reigel, M.
Object Type:
Report
System:
The UNT Digital Library
"Second International AMMA Conference (November 26-30, 2007)"
None
Date:
December 14, 2009
Creator:
Lamb, Peter J.
Object Type:
Report
System:
The UNT Digital Library
SQUID-Detected MRI in the Limit of Zero Static Field
This thesis describes an implementation of the so-called"zero-field MRI" (ZFMRI) pulse sequence, which allows for imaging in an arbitrarily low B<sub>0</sub> field. The ZFMRI sequence created an effective unidirectional gradient field by using a train of pi pulses to average out the concomitant gradient components during encoding. The signals were acquired using a low-transition temperature dc Superconducting QUantum Interference Device (low-Tc dc SQUID) coupled to a first-order axial gradiometer. The experiments were carried out in a liquid helium dewar which was magnetically shielded with a single-layer mu-metal can around the outside and a superconducting Pb can contained within the helium space. We increased the filling factor of the custom-made, double-walled Pyrex insert by placing the liquid alcohol sample, at a temperature of approximately -50 degrees C, at the center of one loop of the superconducting gradiometer, which was immersed in the helium bath.
Date:
December 14, 2009
Creator:
Kelso, Nathan Dean
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Sweetwater Reporter (Sweetwater, Tex.), Vol. 112, No. 26, Ed. 1 Monday, December 14, 2009
Daily newspaper from Sweetwater, Texas that includes local, state, and national news along with advertising.
Date:
December 14, 2009
Creator:
Rodriguez, Tatiana
Object Type:
Newspaper
System:
The Portal to Texas History
U.S. International Trade: Trends and Forecasts
None
Date:
December 14, 2009
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
U.S. Postal Service: The Program for Reassessing Work Provided to Injured Employees Is Under Way, but Actions Are Needed to Improve Program Management
A letter report issued by the Government Accountability Office with an abstract that begins "Between 50,000 and 60,000 United States Postal Service (Service) employees, or 7 to 8 percent of the Service's workforce, occupied a modified work assignment during fiscal year 2008. The Service must provide these assignments to employees with workplace injuries if work is available to perform within their medical restrictions. Historically, the Service has returned employees to work as soon as possible, partly to reduce its costs for workers' compensation. In 2006, the Service initiated a program, the National Reassessment Process (NRP), to ensure that modified work assignments are medically suitable and necessary to carry out the Service's mission. This requested report addresses (1) the goal of the program, (2) how it is being implemented, and (3) the program's status and outcomes. To perform its work, the Government Accountability Office (GAO) analyzed data and documentation, visited four districts selected to illustrate a range of conditions, and interviewed Service officials."
Date:
December 14, 2009
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
United Nations Assistance Mission in Afghanistan: Background and Policy Issues
This report examines the role of United Nations Assistance Mission in Afghanistan (UNAMA) in Afghanistan and discusses the obstacles the organization faces in coordinating international efforts and explores related policy issues and considerations for the 112th Congress.
Date:
December 14, 2009
Creator:
Margesson, Rhoda
Object Type:
Report
System:
The UNT Digital Library
The United Nations Human Rights Council: Issues for Congress
This report provides historical background of the Council, including the role of the previous Commission. It discusses the Council's current mandate and structure, as well as U.S. policy and congressional actions.
Date:
December 14, 2009
Creator:
Blanchfield, Luisa
Object Type:
Report
System:
The UNT Digital Library
VA Construction: VA Is Working to Improve Initial Project Cost Estimates, but Should Analyze Cost and Schedule Risks
A letter report issued by the Government Accountability Office with an abstract that begins "The Department of Veterans Affairs (VA) operates one of the largest health care systems in the country. As of August 2009, VA's Veterans Health Administration (VHA) had 32 major ongoing construction projects with an estimated total cost of about $6.1 billion and average cost per project of about $191 million. Some of these projects were initiated as part of VA's Capital Asset Realignment for Enhanced Services (CARES) process, which was a comprehensive assessment of VHA's capital asset requirements. In response to a congressional request, GAO (1) described how costs and schedules of current VHA major construction projects have changed, (2) determined the reasons for changes in costs and schedules, and (3) described the actions VA has taken to address cost increases and schedule delays. To do its work, GAO reviewed construction documents, visited three construction sites, and interviewed VA officials."
Date:
December 14, 2009
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Water Quality Sampling Locations Along the Shoreline of the Columbia River, Hanford Site, Washington
As environmental monitoring evolved on the Hanford Site, several different conventions were used to name or describe location information for various sampling sites along the Hanford Reach of the Columbia River. These methods range from handwritten descriptions in field notebooks to the use of modern electronic surveying equipment, such as Global Positioning System receivers. These diverse methods resulted in inconsistent archiving of analytical results in various electronic databases and published reports because of multiple names being used for the same site and inaccurate position data. This document provides listings of sampling sites that are associated with groundwater and river water sampling. The report identifies names and locations for sites associated with sampling: (a) near-river groundwater using aquifer sampling tubes; (b) riverbank springs and springs areas; (c) pore water collected from riverbed sediment; and (d) Columbia River water. Included in the listings are historical names used for a particular site and the best available geographic coordinates for the site, as of 2009. In an effort to create more consistency in the descriptive names used for water quality sampling sites, a naming convention is proposed in this document. The convention assumes that a unique identifier is assigned to each site that is …
Date:
December 14, 2009
Creator:
Peterson, Robert E. & Patton, Gregory W.
Object Type:
Report
System:
The UNT Digital Library
Who Regulates Whom? An Overview of U.S. Financial Supervision
Federal financial regulation in the United States has evolved through a series of piecemeal responses to developments and crises in financial markets. This report provides an overview of current U.S. financial regulation: which agencies are responsible for which institutions and markets, and what kinds of authority they have.
Date:
December 14, 2009
Creator:
Jickling, Mark & Murphy, Edward V.
Object Type:
Report
System:
The UNT Digital Library
The Bastrop Advertiser (Bastrop, Tex.), Vol. 156, No. 74, Ed. 1 Saturday, November 14, 2009
Semi-weekly newspaper from Bastrop, Texas that includes local, state and national news along with advertising.
Date:
November 14, 2009
Creator:
Wright, Cyndi
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 89, No. 299, Ed. 1 Saturday, November 14, 2009
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
November 14, 2009
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
Development of a Hydronic Rooftop Unit-HyPak-MA
The majority of U.S. commercial floor space is cooled by rooftop HVAC units (RTUs). RTU popularity derives chiefly from their low initial cost and relative ease of service access without disturbing building occupants. Unfortunately, current RTUs are inherently inefficient due to a combination of characteristics that unnecessarily increase cooling loads and energy use. 36% percent of annual U.S. energy, and two-thirds of electricity, is consumed in and by buildings. Commercial buildings consume approximately 4.2 quads of energy each year at a cost of $230 billion per year, with HVAC equipment consuming 1.2 quads of electricity. More than half of all U.S. commercial floor space is cooled by packaged HVAC units, most of which are rooftop units (RTUs). Inefficient RTUs create an estimated 3.5% of U.S. CO{sub 2} emissions, thus contributing significantly to global warming5. Also, RTUs often fail to maintain adequate ventilation air and air filtration, reducing indoor air quality. This is the second HyPak project to be supported by DOE through NETL. The prior project, referred to as HyPak-1 in this report, had two rounds of prototype fabrication and testing as well as computer modeling and market research. The HyPak-1 prototypes demonstrated the high performance capabilities of the HyPak …
Date:
November 14, 2009
Creator:
Lee, Eric & Berman, Mark
Object Type:
Report
System:
The UNT Digital Library
Doctoral Recital: 2009-11-14 - Helen Dewey Reikofski, soprano
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
November 14, 2009
Creator:
Reikofski, Helen Dewey
Object Type:
Sound
System:
The UNT Digital Library
["Hip-Hop Broadway: The Musical" live performance tape 1 of 2]
Video recording from The Black Academy of Arts and Letters recorded during the "Hip-Hop Broadway: The Musical" live performance at the Winspear Opera House on November 14th, 2009. The footage shows the musical performance including singing, dancing and acting. The tape show the lobby during intermission and then switches to unrelated content at the 2:35:15 time mark.
Date:
November 14, 2009
Creator:
Moore, Melba; Holliday, Jennifer; Badu, Erykah; Blackwell, Harolyn; Fields, Felicia P. & King, Curtis
Object Type:
Video
System:
The UNT Digital Library
["Hip-Hop Broadway: The Musical" live performance tape 2 of 2]
Video recording from The Black Academy of Arts and Letters recorded during the "Hip-Hop Broadway: The Musical" live performance at the Winspear Opera House on November 14th, 2009. The footage shows the musical performance including singing, dancing and acting. The tape being in the lobby of the opera house and shows audience members mingling and concludes with the after show dinner and photos. The tape goes to grey at the 2:49:34 time mark.
Date:
November 14, 2009
Creator:
King, Curtis; Badu, Erykah; Kendall, Trent Armand; Fields, Felicia P.; Hollliday, Jennifer & Moore, Melba
Object Type:
Video
System:
The UNT Digital Library
Oral History Interview with Jodi-Anne Davidson, November 14, 2009
Access:
Use of this item is restricted to the UNT Community
Interview with Jodi-Anne Davidson, Jamaican immigrant, for the Dallas/Fort Worth Metroplex Immigration Project. She discusses her childhood and family history in Jamaica; parents’ divorce; father’s decision to immigrate to the U.S. with two daughters; experiences with the U.S. immigration system; reminiscences of family life in Jamaica and Jamaican history.
Date:
November 14, 2009
Creator:
Park, David & Davidson, Jodi-Anne
Object Type:
Book
System:
The UNT Digital Library