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3-D full waveform inversion of seismic data; Part I. Theory
Full waveform inversion of seismic data is a challenging subject partly because of the lack of precise knowledge of the source. Since currently available approaches involve some form of approximations to the source, inversion results are subject to the quality and the choice of the source information used. A new full waveform inversion scheme has been introduced (Lee and Kim, 2003) using normalized wavefield for simple two-dimensional (2-D) scalar problems. The method does not require source information, so potential inversion errors due to source estimation may be eliminated. A gather of seismic traces is first Fourier-transformed into the frequency domain and a normalized wavefield is obtained for each trace in the frequency domain. Normalization is done with respect to the frequency response of a reference trace selected from the gather, so the complex-valued normalized wavefield is source-independent and dimensionless. The inversion algorithm minimizes misfits between measured normalized wavefield and numerically computed normalized wavefield. In this paper the full waveform inversion is extended to three-dimensional (3-D) problems.
Date:
May 12, 2003
Creator:
Lee, Ki Ha
Object Type:
Article
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 33, No. 2, Ed. 1 Friday, September 12, 2003
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
September 12, 2003
Creator:
Hadley, Meghann
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 33, No. 13, Ed. 1 Friday, December 12, 2003
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
December 12, 2003
Creator:
Pound, Jaylynn Christian
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
3D Computations and Experiments
This project is in its first full year after the combining of two previously funded projects: ''3D Code Development'' and ''Dynamic Material Properties''. The motivation behind this move was to emphasize and strengthen the ties between the experimental work and the computational model development in the materials area. The next year's activities will indicate the merging of the two efforts. The current activity is structured in two tasks. Task A, ''Simulations and Measurements'', combines all the material model development and associated numerical work with the materials-oriented experimental activities. Task B, ''ALE3D Development'', is a continuation of the non-materials related activities from the previous project.
Date:
May 12, 2003
Creator:
Couch, R; Faux, D; Goto, D & Nikkel, D
Object Type:
Report
System:
The UNT Digital Library
3rd Annual Business Hall of Honor Banquet
An event program from the 3rd Annual Business Hall of Honor Banquet at the Fairmont Hotel Dallas, Texas on July, 12, 2003.
Date:
July 12, 2003
Creator:
University of North Texas
Object Type:
Pamphlet
System:
The UNT Digital Library
[3rd annual "First Ladies Luncheon" tape 1 of 2]
Video recording from The Black Academy of Arts and Letters recorded during the 3rd annual "First Ladies Luncheon" held on April 12th, 2003. The lunch was held to recognize the wives of Dallas/Fort Worth area religious leaders for their work in supporting the Academy. The footage shows various speakers addressing a room of well-dressed women.
Date:
April 12, 2003
Creator:
unknown
Object Type:
Video
System:
The UNT Digital Library
78th Texas Legislature, Regular Session, Senate Bill 151, Chapter 19
Bill introduced by the Texas Senate relating to the recognition of foreign adoptions and the issuance of a supplementary birth certificate
Date:
May 12, 2003
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, Senate Bill 209, Chapter 20
Bill introduced by the Texas Senate relating to prohibiting a motor vehicle from being equipped with certain video equipment and devices.
Date:
May 12, 2003
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, Senate Bill 354, Chapter 21
Bill introduced by the Texas Senate relating to the jurisdiction of certain district courts and criminal district courts of Tarrant County.
Date:
May 12, 2003
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, Senate Bill 375, Chapter 22
Bill introduced by the Texas Senate relating to the location where the Court of Appeals for the Ninth Court of Appeals District transacts business.
Date:
May 12, 2003
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, Senate Bill 491, Chapter 23
Bill introduced by the Texas Senate relating to an assessment of school-based mental health and substance abuse programs.
Date:
May 12, 2003
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, Senate Bill 520, Chapter 24
Bill introduced by the Texas Senate relating to the composition of the 83rd Judicial District and to the election of the district attorney for that district.
Date:
May 12, 2003
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, Senate Bill 761, Chapter 25
Bill introduced by the Texas Senate relating to the requirement that certain contracts awarded by the Veterans' Land Board be subject to competitive bidding.
Date:
May 12, 2003
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, Senate Bill 979, Chapter 26
Bill introduced by the Texas Senate relating to the composition of the 274th Judicial District and the jurisdiction of the 207th and 274th district courts.
Date:
May 12, 2003
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, Senate Bill 1430, Chapter 27
Bill introduced by the Texas Senate relating to additional interest for default on certain secondary mortgage loans
Date:
May 12, 2003
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, Senate Bill 1580, Chapter 28
Bill introduced by the Texas Senate relating to bond requirements for privatized maintenance contracts.
Date:
May 12, 2003
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
Absorption and emission spectra of Ce{sup 3+} in elpasolite lattices
None
Date:
June 12, 2003
Creator:
Tanner, Peter A.; Mak, Chris S.K.; Edelstein, Norman M.; Murdoch, Keith M.; Liu, Guokiu; Huang, Jin et al.
Object Type:
Article
System:
The UNT Digital Library
ACTION AND PHASE ANALYSIS TO DETERMINE SEXTUPOLE ERRORS IN RHIC AND THE SPS.
Success in the application of the action and phase analysis to find linear errors at RHIC Interaction Regions [1] has encouraged the creation of a technique based on the action and phase analysis to find non linear errors. In this paper we show the first attempt to measure the sextupole components at RHIC interaction regions using the action and phase method. Experiments done by intentionally activating sextupoles in RHIC and in SPS [2] will also be analyzed with this method. First results have given values for the sextupole errors that at least have the same order of magnitude as the values found by an alternate technique during the RHIC 2001 run [3].
Date:
May 12, 2003
Creator:
Cardona, J.; Peggs, S.; Satogata, T. & Tomas, R.
Object Type:
Article
System:
The UNT Digital Library
Active Cathodes for Super-High Power Density Solid Oxide Fuel Cells Through Space Charge Effects Quarterly Report: July-September 2003
This report summarizes the work done during the fourth quarter of the project. Effort was directed in two areas, namely, continued further development of the model on the role of connectivity on ionic conductivity of porous bodies, including the role of grain boundaries and space charge, and its relationship to cathode polarization; and fabrication of samaria-doped ceria porous (SDC). The work on the model development involves calculation of the effect of space charge on transport through porous bodies. Three specific cases have been examined: (1) Space charge resistivity greater than the grain resistivity, (2) Space charge resistivity equal to the grain resistivity, and (3) Space charge resistivity lower than the grain resistivity. The model accounts for transport through three regions: the bulk of the grain, the space charge region, and the structural part of the grain boundary. The effect of neck size has been explicitly incorporated. In future work, the effective resistivity will be incorporated into the effective cathode polarization resistance. The results will then be compared with experiments.
Date:
December 12, 2003
Creator:
Virkar, Anil V.
Object Type:
Report
System:
The UNT Digital Library
Advanced Light Source Activity Report 2002
This annual report of the Advanced Light Source details science highlights and facility improvements during the year. It also offers information on events sponsored by the facility, technical specifications, and staff and publication information.
Date:
June 12, 2003
Creator:
Duque, Theresa; Greiner, Annette; Moxon, Elizabeth; Robinson, Arthur & Tamura, Lori (Editors)
Object Type:
Report
System:
The UNT Digital Library
ADVANCED SOLID STATE SENSORS FOR VISION 21 SYSTEMS
Device fabrication and characterization studies relevant to the development of silicon carbide (SiC) based gas and temperature sensors have been performed. Initial studies of Pd deposition on Si were performed since the procedures for Si substrate preparation were well known to us. This allowed us to gain experience in controlling the deposition process while continuing to investigate methods of preparing the SiC substrate surface. Studies of SiC surface preparation were carried out under a separate contract. As our SiC substrate preparation techniques improved, studies of Pd deposition on SiC were performed and the thermal stability of Pd/SiC interfaces (i.e., the critical sensor component) was characterized. These studies have demonstrated that the Pd/SiC interface is remarkably stable at temperatures up to 670 C. At this time, we are moving rapidly to a point where the oxide overlayer can be reproducibly reduced to an acceptable level and large areas of the substrate can be reproducibly produced with the surface roughness reduced to the atomic scale. We believe that this will substantially improve the thermal stability of the Pd/SiC interface. In all these studies, techniques are being used that could readily be incorporated into commercial processes. Moreover, as a result of our ultrahigh …
Date:
February 12, 2003
Creator:
Meehan, K. & Stinespring, C.D.
Object Type:
Report
System:
The UNT Digital Library
ADVANCEMENT OF THE RHIC BEAM ABORT KICKER SYSTEM.
As one of the most critical system for RHIC operation, the beam abort kicker system has to be highly available, reliable, and stable for the entire operating range. Along with the RHIC commission and operation, consistent efforts have been spend to cope with immediate issues as well as inherited design issues. Major design changes have been implemented to achieve the higher operating voltage, longer high voltage hold-off time, fast retriggering and redundant triggering, and improved system protection, etc. Recent system test has demonstrated for the first time that both blue ring and yellow ring beam abort systems have achieved more than 24 hours hold off time at desired operating voltage. In this paper, we report break down, thyratron reverse arcing, and to build a fast re-trigger system to reduce beam spreading in event of premature discharge.
Date:
May 12, 2003
Creator:
ZHANG,W. AHRENS,L. MI,J. OERTER,B. SANDBERG,J. WARBURTON,D.
Object Type:
Article
System:
The UNT Digital Library
AFCI Repository Impact Evaluation Report Systems Analysis Progress - FY03
This activity will assess the waste management benefits from AFC, specifically both short and long term benefits for the U.S. geologic repository program. This includes quantitative evaluation of repository issues (heat load and thermal management, mass and volume, radiotoxicity and dose, waste form optimization, etc.) where AFC can provide the technical basis for improvements in cost, capacity and performance for a repository, and the technical potential to defer the need for additional repositories. Supporting analysis will be obtained from ANL, LANL and SRS for inclusion into an Interim Report that will serve as input to the ''Integrated Modeling'' and ''Economic Analysis'' activities, and a Final Report that will document the results of the activity. This activity will endeavor to establish cooperation with DOE-OCRWM to establish mutual understanding of potential repository impacts.
Date:
September 12, 2003
Creator:
Halsey, W G
Object Type:
Report
System:
The UNT Digital Library
AGS Booster Beam Position, Tune, and Longitudinal Profile Data Acquisition System.
In this paper we will describe a data acquisition system designed and developed for the AGS Booster. The system was motivated by the need to get high quality beam diagnostics from the AGS Booster. This was accomplished by locating the electronics and digital data acquisition close to the Booster ring, to minimize loss of bandwidth in the original signals. In addition we had to develop the system rapidly and at a low cost. The system consists of a Lecroy digital oscilloscope which is interfaced through a National Instruments LabView{trademark} server application, developed for this project. This allows multiple client applications to time share the scope without interfering with each other. We will present a description of the system design along with example clients that we have implemented.
Date:
May 12, 2003
Creator:
Brown, K. A.; Ahrens, L.; Severino, F.; Smith, K. & Wilinski, M.
Object Type:
Article
System:
The UNT Digital Library