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An Analytical Solution for Slug-Tracer Tests in FracturedReservoirs
The transport of chemicals or heat in fractured reservoirs is strongly affected by the fracture-matrix interfacial area. In a vapor-dominated geothermal reservoir, this area can be estimated by inert gas tracer tests, where gas diffusion between the fracture and matrix causes the tracer breakthrough curve (BTC) to have a long tail determined by the interfacial area. For water-saturated conditions, recent studies suggest that sorbing solute tracers can also generate strong tails in BTCs that may allow a determination of the fracture-matrix interfacial area. To theoretically explore such a useful phenomenon, this paper develops an analytical solution for BTCs in slug-tracer tests in a water-saturated fractured reservoir. The solution shows that increased sorption should have the same effect on BTCs as an increase of the diffusion coefficient. The solution is useful for understanding transport mechanisms, verifying numerical codes, and for identifying appropriate chemicals as tracers for the characterization of fractured reservoirs.
Date:
March 2, 2005
Creator:
Shan, Chao & Pruess, Karsten
Object Type:
Article
System:
The UNT Digital Library
Application of the NUFT Code for Subsurface Remediation by Bioventing
Bioventing (BV) is a promising, cost-effective technology for the biodegradation of soil contaminated with petroleum hydrocarbons. The goal of BV is to stimulate naturally-occurring soil microorganisms to degrade organic contaminants in the soil. In natural systems the rate of biodegradation is eventually limited by the lack of oxygen and other electron acceptors (i.e., a compound that gains electrons during biodegradation) rather than by the lack of nutrients (i.e., electron donors). In conventional bioventing systems, oxygen is delivered by an electric blower to subsurface wells. The airflow rate is usually low in contrast to soil vapor extraction, just enough to provide sufficient oxygen to maintain or enhance microbial activity. In order to design a bioventing system wisely, decision makers should understand the role that design variables may play. Those design variables include locations of injection wells, injection rates, air pressure and moisture at wells, water table control, monitoring well locations, etc. Trade-off between these variables should be made before the implementation of a bioventing system. Obviously, the mathematical model corresponding to the multiphase flow and multi-species reactive transport is essential to describing the relations between design variables and system response. The work phases for the project are: (Phase 1) building biodegradation …
Date:
March 2, 2000
Creator:
Nitao, J. J.; Sun, Y.; Demir, Z. & Delorenzo, T.
Object Type:
Report
System:
The UNT Digital Library
The Archer Advocate (Holliday, Tex.), Vol. 2, No. 48, Ed. 1 Wednesday, March 2, 2005
Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2005
Creator:
Thomas, John
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County Advocate (Holliday, Tex.), Vol. 3, No. 47, Ed. 1 Thursday, March 2, 2006
Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2006
Creator:
Cooper, James H.
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County News (Archer City, Tex.), No. 9, Ed. 1 Thursday, March 2, 2000
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2000
Creator:
Lewis, Shelley
Object Type:
Newspaper
System:
The Portal to Texas History
Atomic Resolution Imaging with a sub-50 pm Electron Probe
Using a highly coherent focused electron probe in a 5th order aberration-corrected transmission electron microscope, we report on resolving a crystal spacing less than 50 pm. Based on the geometrical source size and residual coherent and incoherent axial lens aberrations, an electron probe is calculated, which is theoretically capable of resolving an ideal 47 pm spacing with 29percent contrast. Our experimental data show the 47 pm spacing of a Ge 114 crystal imaged with 11-18percent contrast at a 60-95percent confidence level, providing the first direct evidence for sub 50-pm resolution in ADF STEM imaging.
Date:
March 2, 2009
Creator:
Erni, Rolf P.; Rossell, Marta D.; Kisielowski, Christian & Dahmen, Ulrich
Object Type:
Article
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 78, No. 106, Ed. 1 Thursday, March 2, 2000
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2000
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 96, Ed. 1 Friday, March 2, 2001
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2001
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 80, No. 96, Ed. 1 Saturday, March 2, 2002
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2002
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 81, No. 97, Ed. 1 Sunday, March 2, 2003
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2003
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 82, No. 91, Ed. 1 Tuesday, March 2, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 84, No. 88, Ed. 1 Wednesday, March 2, 2005
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2005
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 85, No. 83, Ed. 1 Thursday, March 2, 2006
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2006
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 86, No. 94, Ed. 1 Friday, March 2, 2007
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2007
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 88, No. 62, Ed. 1 Sunday, March 2, 2008
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2008
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 89, No. 60, Ed. 1 Monday, March 2, 2009
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2009
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
Beyond the dna: a prototype for functional genomics
A prototype oligonucleotide ''functional chip'' has been developed to screen novel DNA repair proteins for their ability to bind or alter different forms of DNA. This chip has been developed as a functional genomics screen for analysis of protein-DNA interactions for novel proteins identified from the Human Genome Project The process of novel gene identification that has ensued as a consequence of available sequence information is remarkable. The challenge how lies in determining the function of newly identified gene products in a time-and cost-effective high-throughput manner. The functional chip is generated by the robotic application of DNA spotted in a microarray format onto a glass slide. Individual proteins are then analyzed against the different form of DNA bound to the slide. Several prototype functional chips were designed to contain various DNA fragments tethered to a glass slide for analysis of protein-DNA binding or enzymatic activity of known proteins. The technology has been developed to screen novel, putative DNA repair proteins for their ability to bind various types of DNA alone and in concert with protein partners. An additional scheme has been devised to screen putative repair enzymes for their ability to process different types of DNA molecules. Current methods to …
Date:
March 2, 2000
Creator:
Albala, J
Object Type:
Report
System:
The UNT Digital Library
Bioremediation of Petroleum Hydrocarbons in Heterogeneous Soils
Western Research Institute (WRI) in conjunction with the University of Wyoming, Department of Renewable Resources and the U.S. Department of Energy, under Task 35, conducted a laboratory-scale study of hydrocarbon biodegradation rates versus a variety of physical and chemical parameters to develop a base model. By using this model, biodegradation of Petroleum hydrocarbons in heterogeneous soils can be predicted. The base model, as developed in this study, have been tested by both field and laboratory data. Temperature, pH, and nutrients appear to be the key parameters that can be incorporate into the model to predict biodegradation rates. Results to date show the effect of soil texture and source on the role of each parameter in the rates of hydrocarbon biodegradation. Derived from the existing study, an alternative approach of using CO{sub 2} accumulation data has been attempted by our collaborators at the University of Wyoming. The model has been modified and fine tuned by incorporating these data to provide more information on biodegradation.
Date:
March 2, 2006
Creator:
Jin, Song; Fallgren, Paul & Brown, Terry
Object Type:
Report
System:
The UNT Digital Library
The Boerne Star (Boerne, Tex.), Vol. 96, No. 18, Ed. 1 Friday, March 2, 2001
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2001
Creator:
Keasling, Edna & Pritchett, Melissa
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 98, No. 18, Ed. 1 Tuesday, March 2, 2004
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2004
Creator:
Cartwright, Brian & Morgan, Clay
Object Type:
Newspaper
System:
The Portal to Texas History
Boerne Star & Recorder (Boerne, Tex.), Vol. 101, No. 18, Ed. 1 Friday, March 2, 2007
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2007
Creator:
Cartwright, Brian
Object Type:
Newspaper
System:
The Portal to Texas History
Bogata News (Bogata, Tex.), Vol. 89, No. 42, Ed. 1 Thursday, March 2, 2000
Weekly newspaper from Bogata, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2000
Creator:
Nichols, Nanalee & Nichols, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
Brady Standard-Herald and Heart O' Texas News (Brady, Tex.), Ed. 1 Friday, March 2, 2001
Semiweekly newspaper from Brady, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2001
Creator:
Stewart, James E.
Object Type:
Newspaper
System:
The Portal to Texas History
Brady Standard-Herald and Heart O' Texas News (Brady, Tex.), Ed. 1 Tuesday, March 2, 2004
Semiweekly newspaper from Brady, Texas that includes local, state, and national news along with advertising.
Date:
March 2, 2004
Creator:
Stewart, James E.
Object Type:
Newspaper
System:
The Portal to Texas History