Partner
UNT Libraries Government Documents Department
2,723
UNT Libraries
80
Oklahoma Historical Society
46
UNT Libraries Special Collections
25
Sterling Municipal Library
12
National Museum of the Pacific War/Admiral Nimitz Foundation
10
Oklahoma State Firefighters Museum
10
UNT College of Information
8
Abilene Christian University Library
5
Carl Albert Congressional Research and Studies Center
5
52 More
Collection
Office of Scientific & Technical Information Technical Reports
2,589
Texas Digital Newspaper Program
146
Congressional Research Service Reports
96
Oklahoma Digital Newspaper Program
64
Tocker Foundation Grant
49
Photographing Texas
39
The Greensheet
29
Government Accountability Office Reports
28
The Baytown Sun
12
Altus Times-Democrat
10
92 More
Degree Department
Degree Level
Country
Decade
Year
Month
Day
Language
3,029 Matching Results
Results open in a new window/tab.
A Search For The Z -> b anti-b Process at The D-Zero Experiment
In 2001, the D0 experiment entered a new era. Run II of the Tevatron at the Fermi National Accelerator Laboratory began, and the collider became the highest energy particle accelerator in the world. Accordingly, the D0 detector had already undergone a series of upgrades in order to fully exploit the physics now within reach. These included improvements to the tracking, calorimetry, muon detection and triggering capabilities. In the Standard Model, the Higgs boson is the last piece of the puzzle that remains to be discovered. The Higgs mechanism and consequently the Higgs boson is thought to be the fundamental ingredient by which particles acquire mass, and its existence (or lack of existence) is one of the most pressing issues in particle physics today. As such, one of the main goals of the Run II physics programme at D0 is to search for it. Armed with new accelerator capabilities, D0 will be able to impose tighter constraints on the mass of the Higgs, and perhaps even detect this elusive particle. If the Higgs does exist, it will be extremely difficult to find. One of the main challenges at a hadron-hadron collider is to reduce the large QCD background that masks the …
Date:
November 1, 2006
Creator:
Jenkins, Amber Helen
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Experimental Breeder Reactor I Preservation Plan
Experimental Breeder Reactor I (EBR I) is a National Historic Landmark located at the Idaho National Laboratory, a Department of Energy laboratory in southeastern Idaho. The facility is significant for its association and contributions to the development of nuclear reactor testing and development. This Plan includes a structural assessment of the interior and exterior of the EBR I Reactor Building from a preservation, rather than an engineering stand point and recommendations for maintenance to ensure its continued protection.
Date:
October 1, 2006
Creator:
Braun, Julie
Object Type:
Report
System:
The UNT Digital Library
Heavy Flavor Measurements at RHIC in the Near Future
We discuss the recent results on open charm measurements at RHIC. The heavy flavor upgrade program for both PHENIX and STAR experiments are briefly discussed. The completion of the program will yield important information on light flavor thermalization of the partonic matter created in high-energy nuclear collisions at RHIC. A new era of RHIC is ahead of us with the progress of the upgrade program.
Date:
December 1, 2006
Creator:
Xu, Nu
Object Type:
Article
System:
The UNT Digital Library
Evaluation of Cavitation-Erosion Resistance of 316LN Stainless Steel in Mercury Containing Metallic Solutes
Room temperature cavitation tests of vacuum annealed type 316LN stainless steel were performed in pure Hg and in Hg with various amounts of metallic solute to evaluate potential mitigation of erosion/wastage. Tests were performed using an ultrasonic vibratory horn with specimens attached at the tip. All of the solutes examined, which included 5 wt% In, 10 wt% In, 4.4 wt% Cd, 2 wt% Ga, and a mixture that included 1 wt% each of Pb, Sn, and Zn, were found to increase cavitation-erosion as measured by increased weight loss and/or surface profile development compared to exposures for the same conditions in pure Hg. Qualitatively, each solute appeared to increase the post-test wetting tenacity of the Hg solutions and render the Hg mixture susceptible to manipulation of droplet shape.
Date:
August 1, 2006
Creator:
Pawel, Steven J & Mansur, Louis K
Object Type:
Report
System:
The UNT Digital Library
GeV electron beams from a laser-plasma accelerator
High-quality electron beams with up to 1 GeV energy havebeen generated by a laser-driven plasma-based accelerator by guiding a 40TW peak power laser pulse in a 3.3 cm long gas-filled capillary dischargewaveguide.
Date:
October 1, 2006
Creator:
Schroeder, C. B.; Tóth, Cs.; Nagler, B.; Gonsalves, A. J.; Nakamura, K.; Geddes, C. G. R. et al.
Object Type:
Article
System:
The UNT Digital Library
Transport and Deposition of 13c From Methane Injection into Detached H-Mode Plasmas in DIII-D
Experiments are described which examine the transport and deposition of carbon entering the main plasma scrape-off layer in DIII-D. {sup 13}CH{sub 4} was injected from a toroidally symmetric source into the crown of lower single-null detached ELMy H-mode plasmas. {sup 13}C deposition, mapped by nuclear reaction analysis of tiles, was high at the inner divertor but absent at the outer divertor, as found previously for low density L-mode plasmas. This asymmetry indicates that ionized carbon is swept towards the inner divertor by a fast flow in the scrape-off layer. In the private flux region between inner and outer strike points, carbon deposition was low for L-mode but high for the H-mode plasmas. OEDGE modeling reproduces observed deposition patterns and indicates that neutral carbon dominates deposition in the divertor from detached H-mode plasmas.
Date:
June 1, 2006
Creator:
Wampler, W. R.; McLean, A. G.; Allen, S. L.; Brooks, N. H.; Elder, J. D.; Fenstermacher, M. E. et al.
Object Type:
Article
System:
The UNT Digital Library
BlueGene/L Integration Project
None
Date:
February 1, 2006
Creator:
Cupps, K
Object Type:
Report
System:
The UNT Digital Library
Grid Development and a Study of B-flavour tagging at D�
Run IIa of the D0 experiment at the Tevatron took place between Spring 2002 and Spring 2006, collecting approximately 1.2 fb{sup -1} of data. A fundamental principal of the D0 computing model is the utilization of globally distributed computing resources as part of a grid. In particular use is made of the 'SAMGrid'. The first part of this thesis describes the work undertaken at Imperial College on several D0 distributed computing projects. These included the deployment and development of parts of the SAMGrid software suite, and participation in the Winter 2003/2004 data reprocessing effort. One of the major goals of the D0 experiment is the observation of mixing in the B{sub s}{sup 0}-meson system. The measurement of the mixing frequency is important as it can be used to constrain the CKM matrix, which describes CP violation in the Standard Model. The second part of this thesis describes the development of an opposite side flavour tagging algorithm and its calibration using B{sup +} and B{sub d}{sup 0} meson decays. The application of this algorithm to an analysis of the B{sub s}{sup 0} meson system is then described, which lead to the world's first two-sided limit on the B{sub s}{sup 0} meson …
Date:
September 1, 2006
Creator:
Lewis, Philip William
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Low energy spread 100 MeV-1 GeV electron bunches from laserwakefiel d acceleration at LOASIS
Experiments at the LOASIS laboratory of LBNL recentlydemonstrated production of 100 MeV electron beams with low energy spreadand low divergence from laser wakefield acceleration. The radiationpressure of a 10 TW laser pulse guided over 10 diffraction ranges by aplasma density channel was used to drive an intense plasma wave(wakefield), producing acceleration gradients on the order of 100 GV/m ina mm-scale channel. Beam energy has now been increased from 100 to 1000MeV by using a cm-scale guiding channel at lower density, driven by a 40TW laser, demonstrating the anticipated scaling to higher beam energies.Particle simulations indicate that the low energy spread beams wereproduced from self trapped electrons through the interplay of trapping,loading, and dephasing. Other experiments and simulations are alsounderway to control injection of particles into the wake, and henceimprove beam quality and stability further.
Date:
August 1, 2006
Creator:
Geddes, C. G. R.; Esarey, E.; Michel, P.; Nagler, B.; Nakamura, K.; Plateau, G. R. et al.
Object Type:
Article
System:
The UNT Digital Library
The Role of Demand Resources In Regional Transmission Expansion Planning and Reliable Operations
Investigating the role of demand resources in regional transmission planning has provided mixed results. On one hand there are only a few projects where demand response has been used as an explicit alternative to transmission enhancement. On the other hand there is a fair amount of demand response in the form of energy efficiency, peak reduction, emergency load shedding, and (recently) demand providing ancillary services. All of this demand response reduces the need for transmission enhancements. Demand response capability is typically (but not always) factored into transmission planning as a reduction in the load which must be served. In that sense demand response is utilized as an alternative to transmission expansion. Much more demand response is used (involuntarily) as load shedding under extreme conditions to prevent cascading blackouts. The amount of additional transmission and generation that would be required to provide the current level of reliability if load shedding were not available is difficult to imagine and would be impractical to build. In a very real sense demand response solutions are equitably treated in every region - when proposed, demand response projects are evaluated against existing reliability and economic criteria. The regional councils, RTOs, and ISOs identify needs. Others propose …
Date:
July 1, 2006
Creator:
Kirby, Brendan J.
Object Type:
Report
System:
The UNT Digital Library
Special Issue On Estimation Of Baselines And Leakage In CarbonMitigation Forestry Projects
There is a growing acceptance that the environmentalbenefits of forests extend beyond traditional ecological benefits andinclude the mitigation of climate change. Interest in forestry mitigationactivities has led to the inclusion of forestry practices at the projectlevel in international agreements. Climate change activities place newdemands on participating institutions to set baselines, establishadditionality, determine leakage, ensure permanence, and monitor andverify a project's greenhouse gas benefits. These issues are common toboth forestry and other types of mitigation projects. They demandempirical evidence to establish conditions under which such projects canprovide sustained long term global benefits. This Special Issue reportson papers that experiment with a range of approaches based on empiricalevidence for the setting of baselines and estimation of leakage inprojects in developing Asia and Latin America.
Date:
June 1, 2006
Creator:
Sathaye, Jayant A. & Andrasko, Kenneth
Object Type:
Article
System:
The UNT Digital Library
Clean Slate Environmental Remediation DSA for 10 CFR 830 Compliance
Clean Slate Sites II and III are scheduled for environmental remediation (ER) to remove elevated levels of radionuclides in soil. These sites are contaminated with legacy remains of non-nuclear yield nuclear weapons experiments at the Nevada Test Site, that involved high explosive, fissile, and related materials. The sites may also hold unexploded ordnance (UXO) from military training activities in the area over the intervening years. Regulation 10 CFR 830 (Ref. 1) identifies DOE-STD-1120-98 (Ref. 2) and 29 CFR 1910.120 (Ref. 3) as the safe harbor methodologies for performing these remediation operations. Of these methodologies, DOE-STD-1120-98 has been superseded by DOE-STD-1120-2005 (Ref. 4). The project adopted DOE-STD-1120-2005, which includes an approach for ER projects, in combination with 29 CFR 1910.120, as the basis documents for preparing the documented safety analysis (DSA). To securely implement the safe harbor methodologies, we applied DOE-STD-1027-92 (Ref. 5) and DOE-STD-3009-94 (Ref. 6), as needed, to develop a robust hazard classification and hazards analysis that addresses non-standard hazards such as radionuclides and UXO. The hazard analyses provided the basis for identifying Technical Safety Requirements (TSR) level controls. The DOE-STD-1186-2004 (Ref. 7) methodology showed that some controls warranted elevation to Specific Administrative Control (SAC) status. In addition to …
Date:
August 1, 2006
Creator:
James L. Traynor, Stephen L. Nicolosi, Michael L. Space, Louis F. Restrepo
Object Type:
Article
System:
The UNT Digital Library
A multisensor system for detection and characterization of UXO(MM-0437) - Demonstration Report
The Berkeley UXO discriminator (BUD) (Figure 1) is a portable Active Electromagnetic (AEM) system for UXO detection and characterization that quickly determines the location, size, and symmetry properties of a suspected UXO. The BUD comprises of three orthogonal transmitters that 'illuminate' a target with fields in three independent directions in order to stimulate the three polarization modes that, in general, characterize the target EM response. In addition, the BUD uses eight pairs of differenced receivers for response recording. Eight receiver coils are placed horizontally along the two diagonals of the upper and lower planes of the two horizontal transmitter loops. These receiver coil pairs are located on symmetry lines through the center of the system and each pair sees identical fields during the on-time of the pulse in all of the transmitter coils. They are wired in opposition to produce zero output during the on-time of the pulses in three orthogonal transmitters. Moreover, this configuration dramatically reduces noise in the measurements by canceling the background electromagnetic fields (these fields are uniform over the scale of the receiver array and are consequently nulled by the differencing operation), and by canceling the noise contributed by the tilt of the receivers in the …
Date:
June 1, 2006
Creator:
Gasperikova, Erika; Smith, J.T.; Morrison, H.F. & Becker, A.
Object Type:
Report
System:
The UNT Digital Library
OEDGE Modeling of the DIII-D H-Mode 13CH4 Puffing Experiment
Use of carbon in tokamaks leads to a serious tritium retention issue due to co-deposition. To further investigate the processes involved, a detached ELMy H-mode (6.5 MW NBI) experiment was performed on DIII-D in which {sup 13}CH{sub 4} was puffed into the main vessel through the toroidally symmetric pumping plenum at the top of lower single-null discharges. Subsequently, the {sup 13}C content of tiles taken from the vessel wall was measured. The interpretive OEDGE code was used to model the results. The {sup 13}C deposition pattern could be reproduced, in general shape and magnitude, by assuming in the code the existence of a parallel flow and a radial pinch in the scrape-off layer. Parallel flows of Mach {approx} 0.3 toward the inner divertor and a radial pinch {approx}10 to 20 m/s (+ R-direction) were found to yield {sup 13}C deposition comparable to the experiment.
Date:
June 1, 2006
Creator:
Elder, J. D.; McLean, A. G.; Stangeby, P. C.; Allen, S. L.; Boedo, J. C.; Bray, B. D. et al.
Object Type:
Article
System:
The UNT Digital Library
MCNP Comparison With Point Source Measurements From a Portable HPGe System
The Ortec trans-SPEC is a portable gamma ray spectrometer which is approximately 10.4 kg in total weight and 37 cm × 16 cm × 32 cm in overall size It utilizes a P-type 50 mm diameter and 30 mm height coaxial HPGe detector and has more than 3 hours of battery life when fully charged. This paper details the experimental agreement found for one of these detector units and that of MCNP5 [1] calculations. The purpose of carrying out this work is to evaluate the potential utility of the spectrometer for emergency response (consequence management) applications.
Date:
January 1, 2006
Creator:
Hayes, Robert
Object Type:
Article
System:
The UNT Digital Library
Initial Business Case Analysis of Two Integrated Heat Pump HVAC Systems for Near-Zero-Energy Homes -- Update to Include Analyses of an Economizer Option and Alternative Winter Water Heating Control Option
The long range strategic goal of the Department of Energy's Building Technologies (DOE/BT) Program is to create, by 2020, technologies and design approaches that enable the construction of net-zero energy homes at low incremental cost (DOE/BT 2005). A net zero energy home (NZEH) is a residential building with greatly reduced needs for energy through efficiency gains, with the balance of energy needs supplied by renewable technologies. While initially focused on new construction, these technologies and design approaches are intended to have application to buildings constructed before 2020 as well resulting in substantial reduction in energy use for all building types and ages. DOE/BT's Emerging Technologies (ET) team is working to support this strategic goal by identifying and developing advanced heating, ventilating, air-conditioning, and water heating (HVAC/WH) technology options applicable to NZEHs. Although the energy efficiency of heating, ventilating, and air-conditioning (HVAC) equipment has increased substantially in recent years, new approaches are needed to continue this trend. Dramatic efficiency improvements are necessary to enable progress toward the NZEH goals, and will require a radical rethinking of opportunities to improve system performance. The large reductions in HVAC energy consumption necessary to support the NZEH goals require a systems-oriented analysis approach that characterizes …
Date:
December 1, 2006
Creator:
Baxter, Van D
Object Type:
Report
System:
The UNT Digital Library
Fox-2 Splicing Factor Binds to a Conserved Intron Motif to PromoteInclusion of Protein 4.1R Alternative Exon 16
Activation of protein 4.1R exon 16 (E16) inclusion during erythropoiesis represents a physiologically important splicing switch that increases 4.1R affinity for spectrin and actin. Previous studies showed that negative regulation of E16 splicing is mediated by the binding of hnRNP A/B proteins to silencer elements in the exon and that downregulation of hnRNP A/B proteins in erythroblasts leads to activation of E16 inclusion. This paper demonstrates that positive regulation of E16 splicing can be mediated by Fox-2 or Fox-1, two closely related splicing factors that possess identical RNA recognition motifs. SELEX experiments with human Fox-1 revealed highly selective binding to the hexamer UGCAUG. Both Fox-1 and Fox-2 were able to bind the conserved UGCAUG elements in the proximal intron downstream of E16, and both could activate E16 splicing in HeLa cell co-transfection assays in a UGCAUG-dependent manner. Conversely, knockdown of Fox-2 expression, achieved with two different siRNA sequences resulted in decreased E16 splicing. Moreover, immunoblot experiments demonstrate mouse erythroblasts express Fox-2, but not Fox-1. These findings suggest that Fox-2 is a physiological activator of E16 splicing in differentiating erythroid cells in vivo. Recent experiments show that UGCAUG is present in the proximal intron sequence of many tissue-specific alternative exons, and …
Date:
March 1, 2006
Creator:
Ponthier, Julie L.; Schluepen, Christina; Chen, Weiguo; Lersch,Robert A.; Gee, Sherry L.; Hou, Victor C. et al.
Object Type:
Article
System:
The UNT Digital Library
Customer Response to RTP in Competitive Markets: A Study ofNiagara Mohawk's Standard Offer Tariff
Utilizing load, price, and survey data for 119 largecustomers that paid competitively determined hourly electricity pricesannounced the previous day between 2000 and 2004, this study providesinsight into the factors that determine the intensity of price response.Peak and off-peak electricity can be: perfect complements, substitutes,or substitutes where high peak prices cause temporary disconnection fromthe grid, as for some firms with on-site generation. The averageelasticity of substitution is 0.11. Thirty percent of the customers usepeak and off-peak electricity in fixed proportions. The 18 percent withelasticities greater than 0.10 provide 75 percent of the aggregate priceresponse. In contrast to Industrial customers, Commercial/Retail andGovernment/Education customers are more price responsive on hot days andwhen the ratio of peak to off-peak prices is high. Price responsivenessis not substantially reduced when customers operate near peak usage.Diversity of customer circumstances and price response suggest dynamicpricing is suited for some, but not all customers.
Date:
June 1, 2006
Creator:
Boisvert, Richard N.; Cappers, Peter; Goldman, Charles; Neenan,Bernie & Hopper, Nicole
Object Type:
Article
System:
The UNT Digital Library
High-luminosity primary vertex selection in top-quark studies using the Collider Detector at Fermilab
Improving our ability to identify the top quark pair (t{bar t}) primary vertex (PV) on an event-by-event basis is essential for many analyses in the lepton-plus-jets channel performed by the Collider Detector at Fermilab (CDF) Collaboration. We compare the algorithm currently used by CDF (A1) with another algorithm (A2) using Monte Carlo simulation at high instantaneous luminosities. We confirm that A1 is more efficient than A2 at selecting the t{bar t} PV at all PV multiplicities, both with efficiencies larger than 99%. Event selection rejects events with a distance larger than 5 cm along the proton beam between the t{bar t} PV and the charged lepton. We find flat distributions for the signal over background significance of this cut for all cut values larger than 1 cm, for all PV multiplicities and for both algorithms. We conclude that any cut value larger than 1 cm is acceptable for both algorithms under the Tevatron's expected instantaneous luminosity improvements.
Date:
August 1, 2006
Creator:
Buzatu, Adrian
Object Type:
Report
System:
The UNT Digital Library
Jet Energy Scale Studies and the Search for the Standard Model Higgs Boson in the Channel ZH -> nu anti-nu b anti-b at D�
The D0 experiment is based at the Tevatron, which is currently the world's highest-energy accelerator. The detector comprises three major subsystems: the tracking system, the calorimeter and the muon detector. Jets, seen in the calorimeter, are the most common product of the proton-proton interactions at 2TeV. This thesis is divided into two parts. The first part focuses on jets and describes the derivation of a jet energy scale using p{bar p} {yields} (Z + jets) events as a cross-check of the official D0 jet energy scale (Versions 4.2 and 5.1) which is derived using p{bar p} {yields} {gamma} + jets events. Closure tests were also carried out on the jet energy calibration as a further verification. Jets from b-quarks are commonly produced at D0, readily identified and are a useful physics tool. These require a special correction in the case where the b-jet decays via a muon and a neutrino. Thus a semileptonic correction was also derived as an addition to the standard energy correction for jets. The search for the Higgs boson is one of the largest physics programs at D0. The second part of this thesis describes a search for the Standard Model Higgs boson in the ZH …
Date:
November 1, 2006
Creator:
Lobo, Lydia Mary Isis
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Meta-Analyses of the Associations of Respiratory Health Effectswith Dampness and Mold in Homes
The Institute of Medicine (IOM) of the National Academy of Sciences recently completed a critical review of the scientific literature pertaining to the association of indoor dampness and mold contamination with adverse health effects. In this paper, we report the results of quantitative meta-analysis of the studies reviewed in the IOM report. We developed point estimates and confidence intervals (CIs) to summarize the association of several respiratory and asthma-related health outcomes with the presence of dampness and mold in homes. The odds ratios and confidence intervals from the original studies were transformed to the log scale and random effect models were applied to the log odds ratios and their variance. Models were constructed both accounting for the correlation between multiple results within the studies analyzed and ignoring such potential correlation. Central estimates of ORs for the health outcomes ranged from 1.32 to 2.10, with most central estimates between 1.3 and 1.8. Confidence intervals (95%) excluded unity except in two of 28 instances, and in most cases the lower bound of the CI exceeded 1.2. In general, the two meta-analysis methods produced similar estimates for ORs and CIs. Based on the results of the meta-analyses, building dampness and mold are associated …
Date:
January 1, 2006
Creator:
Fisk, William J.; Lei-Gomez, Quanhong & Mendell, Mark J.
Object Type:
Article
System:
The UNT Digital Library
A Multisensor system for the detection and characterization of UXOMM-0437
A prototype active electromagnetic system has been developedfor detecting and characterizing UXO. The system employs two orthogonalvertical loop transmitters and a pair of horizontal loop transmittersspaced apart vertically by 0.7 m. Eight vertical field detectors aredeployed in the plane of each of the horizontal loops and are arranged tomeasure offset vertical gradients of the fields. The location andorientation of the three principal polarizabilities of a target can berecovered from a single position of the transmitter-receiver system.Further characterization of the target is obtained from the broadbandresponse. The system employs a bipolar half sine pulse train currentwaveform and the detectors are dB/dt induction coils designed to minimizethe transient response of the primary field pulse. The target transientis recovered in a 40 mu-sec to 1.0 msec window. The ground responseimposes an early time limit on the time window and system/ambient noiselimits the late time response. Nevertheless for practical transmittermoments and optimum receivers the size and the ratio of conductivity topermeability canbe accurately recovered. The prototype system hassuccessfully recovered the depths and polarizabilities of ellipsoidaltest targets.
Date:
June 1, 2006
Creator:
Gasperikova, Erika; Becker, A.; Morrison, H.F. & Smith, J.T.
Object Type:
Report
System:
The UNT Digital Library
In-situ borehole seismic monitoring of injected CO2 at the FrioSite
The U.S. Dept. of Energy funded Frio Brine Pilot provided an opportunity to test borehole seismic monitoring techniques in a saline formation in southeast Texas. A relatively small amount of CO{sub 2} was injected (about 1600 tons) into a thin injection interval (about 6 m thick at 1500 m depth). Designed tests included time-lapse vertical seismic profile (VSP) and crosswell surveys which investigated the detectability of CO{sub 2} with surface-to-borehole and borehole-to-borehole measurement.
Date:
June 1, 2006
Creator:
Daley, Thomas M. & Korneev, Valeri A.
Object Type:
Article
System:
The UNT Digital Library
Modeling Hydrogeological and Geomenchanical Processes Related toCO2 Injection in a Faulted Multilayer System
This paper presents a numerical study of coupled hydrological and geomechanical processes during a deep underground injection of supercritical CO{sub 2} in a hypothetical brine aquifer. We consider a multilayer system in which the injection zone is situated below a sequence of caprock and aquifer layers that are intersected by a vertical fault zone. The fault zone consists of highly fractured shale across the first caprock layers that are located just above the injection zone. Initially, the fractured shale zones are considered sealed with minerals, but we allow fractures (and the fractured zones) to open as a result of injection induced reductions in effective stresses. Our results indicate that even when assuming a very sensitive relationship between effective stress and fractured-zone permeability, the injection-induced changes in permeability across are only moderate with largest changes occurring in the first caprock layer, just above the injection zone. As a result, the upward leakage rate remains relatively small and therefore changes in fluid pressure and hydromechanical effects in overlying zones are also relatively small for the case studied in this paper.
Date:
January 1, 2006
Creator:
Rutqvist, Jonny; Birkholzer, Jens & Tsang, Chin-Fu
Object Type:
Article
System:
The UNT Digital Library