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Study of Charmed Baryon Sigma(C)(2800) Production at the BaBar Experiment (open access)

Study of Charmed Baryon Sigma(C)(2800) Production at the BaBar Experiment

This dissertation reports on a study of search for an orbitally excited state of charmed baryons {Sigma}{sub c}{sup 0}(2800) and {Sigma}{sub c}{sup ++}(2800). They measure the widths, momentum spectrum and production cross-section for these states decaying into a {Lambda}{sub c}{sup +} and a charged {pi}. The analysis uses 230 fb{sup -1} of data collected at BABAR detector operating at PEP-II collider at Stanford Linear Accelerator Center. The data is collected in the region of {Upsilon}(4S) an {approx} 40 MeV below the resonance. {Lambda}{sub c}{sup +} baryon is reconstructed in the decay mode pK{sup -}{pi}{sup +}. The {Sigma}{sub c}(2800) baryon production at continuum is observed to be quite significant for x{sub p} > 0.7, where x{sub p} = p/{radical}E{sup 2}+M{sup 2} is the scaled momentum and varies from 0.0 to 1.0. The momentum spectrum is measured by considering the corrected yield for momentum bins above x{sub p} > 0.5 and can be parameterized very well by a Peterson function, given by: dN/dx{sub p} {proportional_to} 1/x{sub p}(1 - 1/x{sub p} - {epsilon}/1-x{sub p}){sup 2}. The values for the peterson parameter {epsilon}, are found to be 0.050 {+-} 0.010 for {Sigma}{sub c}{sup 0}(2800) and 0.057 {+-} 0.012 for {Sigma}{sub c}{sup ++}(2800). They use …
Date: February 29, 2008
Creator: Ahmded, Shamona
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Extraction of pores from microtomographic reconstructions of intact soil aggregates (open access)

Extraction of pores from microtomographic reconstructions of intact soil aggregates

Segmentation of features is often a necessary step in the analysis of volumetric data. The authors have developed a simple technique for extracting voids from irregular volumetric data sets. In this work they look at extracting pores from soil aggregates. First, they identify a threshold that gives good separability of the object from the background. They then segment the object, and perform connected components analysis on the pores within the object. Using their technique pores that break the surface can be segmented along with pores completely contained in the initially segmented object.
Date: February 29, 2000
Creator: Albee, P. B.; Stockman, G. C. & Smucker, A. J. M.
Object Type: Article
System: The UNT Digital Library
Development and Testing of the Berkeley Darfur Stove (open access)

Development and Testing of the Berkeley Darfur Stove

None
Date: February 29, 2008
Creator: Amrose, Susan; Amrose, Susan; Kisch, G. Theodore; Kirubi, Charles; Woo, Jesse & Gadgil, Ashok
Object Type: Report
System: The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 105, No. 298, Ed. 1 Sunday, February 29, 2004 (open access)

Altus Times (Altus, Okla.), Vol. 105, No. 298, Ed. 1 Sunday, February 29, 2004

Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date: February 29, 2004
Creator: Andrews, Mike
Object Type: Newspaper
System: The Gateway to Oklahoma History
Tensile instabilities for porous plasticity models (open access)

Tensile instabilities for porous plasticity models

Several concepts (and assumptions) from the literature for porous metals and ceramics have been synthesized into a consistent model that predicts an admissibility limit on a material's porous yield surface. To ensure positive plastic work, the rate at which a yield surface can collapse as pores grow in tension must be constrained.
Date: February 29, 2000
Creator: BRANNON,REBECCA M.
Object Type: Article
System: The UNT Digital Library
Technology on In-Situ Gas Generation to Recover Residual Oil Reserves (open access)

Technology on In-Situ Gas Generation to Recover Residual Oil Reserves

This final technical report covers the period October 1, 1995 to February 29, 2008. This chapter begins with an overview of the history of Enhanced Oil Recovery techniques and specifically, CO2 flood. Subsequent chapters conform to the manner consistent with the Activities, Tasks, and Sub-tasks of the project as originally provided in Exhibit C1 in the Project Management Plan dated September 20, 1995. These chapters summarize the objectives, status and conclusions of the major project activities performed during the project period. The report concludes by describing technology transfer activities stemming from the project and providing a reference list of all publications of original research work generated by the project team or by others regarding this project. The overall objective of this project was a final research and development in the United States a technology that was developed at the Institute for Geology and Development of Fossil Fuels in Moscow, Russia. Before the technology can be convincingly adopted by United States oil and gas producers, the laboratory research was conducted at Mew Mexico Institute of Mining and Technology. The experimental studies were conducted to measure the volume and the pressure of the CO{sub 2} gas generated according to the new Russian …
Date: February 29, 2008
Creator: Bakhtiyarov, Sayavur
Object Type: Report
System: The UNT Digital Library
Enhanced Productivity of Chemical Processes Using Dense Fluidized Beds (open access)

Enhanced Productivity of Chemical Processes Using Dense Fluidized Beds

The work detailed in this report addresses Enabling Technologies within Computational Technology by integrating a “breakthrough” particle-fluid computational technology into traditional Process Science and Engineering Technology. The work completed under this DOE project addresses five major development areas 1) gas chemistry in dense fluidized beds 2) thermal cracking of liquid film on solids producing gas products 3) liquid injection in a fluidized bed with particle-to-particle liquid film transport 4) solid-gas chemistry and 5) first level validation of models. Because of the nature of the research using tightly coupled solids and fluid phases with a Lagrangian description of the solids and continuum description of fluid, the work provides ground-breaking advances in reactor prediction capability. This capability has been tested against experimental data where available. The commercial product arising out of this work is called Barracuda and is suitable for a wide (dense-to-dilute) range of industrial scale gas-solid flows with and without reactions. Commercial applications include dense gas-solid beds, gasifiers, riser reactors and cyclones.
Date: February 29, 2008
Creator: Banerjee, Sibashis; Chen, Alvin; Patel, Rutton; Snider, Dale; Williams, Ken; O'Hern, Timothy et al.
Object Type: Report
System: The UNT Digital Library
Solubility of Anthracene in Ternary 2,2,4-Trimethylpentane + Propanol + 1-Pentanol and 2,2,4-Trimethylpentane + Butanol + 1-Pentanol Mixtures (open access)

Solubility of Anthracene in Ternary 2,2,4-Trimethylpentane + Propanol + 1-Pentanol and 2,2,4-Trimethylpentane + Butanol + 1-Pentanol Mixtures

Article on the solubility of anthracene in ternary 2,2,4-trimethylpentane + propanol + 1-pentanol and 2,2,4-trimethylpentane + butanol + 1-pentanol mixtures.
Date: February 29, 2008
Creator: Blake-Taylor, Brooke H.; Martine, Beth A. & Acree, William E. (William Eugene)
Object Type: Article
System: The UNT Digital Library
Appropriations for FY2000: An Overview (open access)

Appropriations for FY2000: An Overview

Appropriations are one part of a complex federal budget process that includes budget resolutions, appropriations (regular, supplemental, and continuing) bills, rescissions, and budget reconciliation bills. This report is a guide to one of the 13 regular appropriations bills that Congress passes each year.
Date: February 29, 2000
Creator: Bley, Mary Frances
Object Type: Report
System: The UNT Digital Library
Recordkeeping in the decommissioning process (open access)

Recordkeeping in the decommissioning process

In the US, there are two sets of key decommissioning records clearly identified -- those that are essential for planning the D and D of a facility and then those that are the result of the decommissioning process itself. In some cases, the regulatory authorities require and in others advise the licensees of the records that may be useful or which are required to be kept from the decommissioning. In the remainder of the paper, the author attempts to highlight some important aspects of decommissioning recordkeeping.
Date: February 29, 2000
Creator: Boing, L. E.
Object Type: Article
System: The UNT Digital Library
Overview of Labor Enforcement Issues in Free Trade Agreements (open access)

Overview of Labor Enforcement Issues in Free Trade Agreements

This report identifies two types of enforcement issues: (1) those that relate to the Free Trade Agreements (FTA) provisions themselves, including their definitions and their enforceability, and (2) those that relate to executive branch responsibilities, such as resource availability and determining dispute settlement case priorities.
Date: February 29, 2008
Creator: Bolle, Mary Jane
Object Type: Report
System: The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 89, No. 146, Ed. 1 Sunday, February 29, 2004 (open access)

Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 89, No. 146, Ed. 1 Sunday, February 29, 2004

Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date: February 29, 2004
Creator: Broaddus, Matthew B.
Object Type: Newspaper
System: The Gateway to Oklahoma History
An Experimental Investigation of a Prescription for Identifying Plastic Strain (open access)

An Experimental Investigation of a Prescription for Identifying Plastic Strain

A series of experiments is described in which a novel prescription for the identification of plastic strain is tested to determine its validity in the context of the strain-space formulation of rate-independent plasticity. Biaxial experiments were performed on several thin-walled aluminum 1100-O cylindrical specimens.
Date: February 29, 2000
Creator: Brown, A. A.; Casey, J. & Nikkel, D. J.
Object Type: Article
System: The UNT Digital Library
Perry Daily Journal (Perry, Okla.), Vol. 107, No. 42, Ed. 1 Tuesday, February 29, 2000 (open access)

Perry Daily Journal (Perry, Okla.), Vol. 107, No. 42, Ed. 1 Tuesday, February 29, 2000

Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date: February 29, 2000
Creator: Brown, Gloria
Object Type: Newspaper
System: The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 116, No. 43, Ed. 1 Friday, February 29, 2008 (open access)

Perry Daily Journal (Perry, Okla.), Vol. 116, No. 43, Ed. 1 Friday, February 29, 2008

Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date: February 29, 2008
Creator: Brown, Gloria
Object Type: Newspaper
System: The Gateway to Oklahoma History
Direct Energy Conversion Fission Reactor Progress Report: December 1999-February 2000 (open access)

Direct Energy Conversion Fission Reactor Progress Report: December 1999-February 2000

OAK-B135 DIRECT ENERGY CONVERSION FISSION REACTOR FOR THE PERIOD DECEMBER 1,1999 THRIUGH FEBRUARY 29,2000
Date: February 29, 2000
Creator: Brown, L. C.
Object Type: Report
System: The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Sunday, February 29, 2004 (open access)

The Express-Star (Chickasha, Okla.), Ed. 1 Sunday, February 29, 2004

Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date: February 29, 2004
Creator: Bush, Kent
Object Type: Newspaper
System: The Gateway to Oklahoma History
The Express-Star (Chickasha, Okla.), Ed. 1 Tuesday, February 29, 2000 (open access)

The Express-Star (Chickasha, Okla.), Ed. 1 Tuesday, February 29, 2000

Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date: February 29, 2000
Creator: Bush, Kent
Object Type: Newspaper
System: The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 100, No. 295, Ed. 1 Tuesday, February 29, 2000 (open access)

Altus Times (Altus, Okla.), Vol. 100, No. 295, Ed. 1 Tuesday, February 29, 2000

Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date: February 29, 2000
Creator: Bush, Michael
Object Type: Newspaper
System: The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 109, No. 233, Ed. 1 Friday, February 29, 2008 (open access)

The Altus Times (Altus, Okla.), Vol. 109, No. 233, Ed. 1 Friday, February 29, 2008

Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date: February 29, 2008
Creator: Bush, Michael
Object Type: Newspaper
System: The Gateway to Oklahoma History
Experimental-based modeling of a support structure as part of a full system model (open access)

Experimental-based modeling of a support structure as part of a full system model

Structural dynamic systems are often attached to a support structure to simulate proper boundary conditions during testing. In some cases the support structure is fairly simple and can be modeled by discrete springs and dampers. In other cases the desired test conditions necessitate the use of a support structural that introduces dynamics of its own. For such cases a more complex structural dynamic model is required to simulate the response of the full combined system. In this paper experimental frequency response functions, admittance function modeling concepts, and least squares reductions are used to develop a support structure model including both translational and rotational degrees of freedom at an attachment location. Subsequently, the modes of the support structure are estimated, and a NASTRAN model is created for attachment to the tested system.
Date: February 29, 2000
Creator: CARNE,THOMAS G. & DOHRMANN,CLARK R.
Object Type: Article
System: The UNT Digital Library
Final Scientific Report : Development of Transition Metal/ Chalcogen Based Cathode Catalysts for PEM Fuel Cells (open access)

Final Scientific Report : Development of Transition Metal/ Chalcogen Based Cathode Catalysts for PEM Fuel Cells

The aim of this project was to investigate the potential for using base metal sulfides and selenides as low cost replacements for precious metal catalysts, such as platinum, currently being used in PEM fuel cells. The approach was to deposit thin films of the materials to be evaluated onto inert electrodes and evaluate their activity for the cathode reaction (oxygen reduction) as well as ex-situ structural and compositional characterization. The most active materials identified are CoS2 and the 50:50 solid solution (Co,Ni)S2. However, the OCP of these materials is still considered too low, at 0.83V and 0.89V vs. RHE respectively, for testing in fuel cells. The methods employed here were necessary to compare with the activity of platinum as, when nano-dispersed on carbon supports, the active surface area of these materials is difficult to measure, making comparisons inaccurate. This research adds to the knowledge of potential candidates for platinum replacement in order to reduce the cost of PEM fuel cell technology and promote commercialization. Although the fabrication methods employed here are strictly experimental, methods were also developed to produce nano-dispersed catalysts with similar compositions, structure and activity. Cycling of these catalysts to highly oxidizing potentials resulted in an increase of …
Date: February 29, 2008
Creator: Campbell, Stephen, A.
Object Type: Report
System: The UNT Digital Library
The Tiger (San Antonio, Tex.), Vol. 51, No. 2, Ed. 1 Tuesday, February 29, 2000 (open access)

The Tiger (San Antonio, Tex.), Vol. 51, No. 2, Ed. 1 Tuesday, February 29, 2000

Monthly student newspaper from St. Philip's College in San Antonio, Texas that includes campus news along with advertising.
Date: February 29, 2000
Creator: Candia, Patti; Christine, Glynis & Agold, Cynthia
Object Type: Newspaper
System: The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 78, No. 104, Ed. 1 Tuesday, February 29, 2000 (open access)

The Baytown Sun (Baytown, Tex.), Vol. 78, No. 104, Ed. 1 Tuesday, February 29, 2000

Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date: February 29, 2000
Creator: Cash, Wanda Garner
Object Type: Newspaper
System: The Portal to Texas History