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Acoustic and Seismic Modalities for Unattended Ground Sensors
In this paper, we have presented the relative advantages and complementary aspects of acoustic and seismic ground sensors. A detailed description of both acoustic and seismic ground sensing methods has been provided. Acoustic and seismic phenomenology including source mechanisms, propagation paths, attenuation, and sensing have been discussed in detail. The effects of seismo-acoustic and acousto-seismic interactions as well as recommendations for minimizing seismic/acoustic cross talk have been highlighted. We have shown representative acoustic and seismic ground sensor data to illustrate the advantages and complementary aspects of the two modalities. The data illustrate that seismic transducers often respond to acoustic excitation through acousto-seismic coupling. Based on these results, we discussed the implications of this phenomenology on the detection, identification, and localization objectives of unattended ground sensors. We have concluded with a methodology for selecting the preferred modality (acoustic and/or seismic) for a particular application.
Date:
March 31, 1999
Creator:
Elbring, G.J.; Ladd, M.D.; McDonald, T.S. & Sleefe, G.E.
Object Type:
Article
System:
The UNT Digital Library
Advanced Silicon Space Solar Cells Using Nanotechnology
Application of nanotechnology and advanced optical structures offer new possibilities for improved radiation tolerance in silicon solar cells. We describe the application of subwavelength diffractive structures to enhance optical absorption near the surface, and thereby improve the radiation tolerance.
Date:
March 31, 1999
Creator:
Gee, J. M.; Ruby, D. S. & Zaidi, S. H.
Object Type:
Article
System:
The UNT Digital Library
Advanced Thermal Barrier Coating System Development
The objectives of the program are to provide an improved Thermal Barrier Coating (TBC) system with increased temperature capability and improved reliability relative to current state of the art TBC systems. The development of such a coating system is essential to the ATS engine meeting its objectives. The base program consists of three phases: Phase I: Program Planning - Complete; Phase II: Development; and Phase III: Selected Specimen - Bench Test Work is being performed in Phase II and III of the program.
Date:
March 31, 1999
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 100, No. 13, Ed. 1 Wednesday, March 31, 1999
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 31, 1999
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, March 31, 1999
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
March 31, 1999
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Analytical studies of top-up safety at the Advanced Photon Source.
The Advanced Photon source (APS) is a 7 GeV, third-generation synchrotron radiation source. To provide more stable beam for users, they are pursuing a new operating mode called top-up. In this mode, the beam current is not allowed to decay as it normally would, but instead is maintained at a high level through frequent injection. A safety question with top-up mode is, during injection with photon shutters open, can injected beam ever exit a photon beamline? This might happen, for example, due to a full or partial short of a dipole coil. The authors discuss a number of analytical calculations that can be used to quickly assess top-up safety for a general ring. They also apply these results to the specific case of the APS. A companion paper in this conference discusses detailed tracking procedures for assessing safety.
Date:
March 31, 1999
Creator:
Emery, L.
Object Type:
Article
System:
The UNT Digital Library
Application of statistical methods for analyzing the relationship between casting distortion, mold filling, and interfacial heat transfer in sand molds
This report presents a statistical method of evaluating geometric tolerances of casting products using point cloud data generated by coordinate measuring machine (CMM) process. The focus of this report is to present a statistical-based approach to evaluate the differences in dimensional and form variations or tolerances of casting products as affected by casting gating system, molding material, casting thickness, and casting orientation at the mold-metal interface. Form parameters such as flatness, parallelism, and other geometric profiles such as angularity, casting length, and height of casting products were obtained and analyzed from CMM point cloud data. In order to relate the dimensional and form errors to the factors under consideration such as flatness and parallelism, a factorial analysis of variance and statistical test means methods were performed to identify the factors that contributed to the casting distortion at the mold-metal interface.
Date:
March 31, 1999
Creator:
Owusu, Y. A.
Object Type:
Report
System:
The UNT Digital Library
Auditing the Nation's Finances: Fiscal Year 1998 Results Highlight Major Issues Needing Resolution
Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a legislative requirement, GAO discussed its report on the U.S. government's financial statements for fiscal year 1998, focusing on the importance of improving how federal departments and agencies manage the finances of the national government."
Date:
March 31, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Automated Sample collection and Analysis unit
Autoramp is an atmospheric radionuclide collection and analysis unit designed for unattended operation. A large volume of air passes through one of 31 filter cartridges which is then moved from a sampling chamber and past a bar code reader, to a shielded enclosure. The collected dust-borne radionuclides are counted with a high resolution germanium gamma-ray detector. An analysis is made and the results are transmitted to a central station that can also remotely control the unit.
Date:
March 31, 1999
Creator:
Latner, Norman; Sanderson, Colin G. & Negro, Vincent C.
Object Type:
Patent
System:
The UNT Digital Library
Automation and integration of multiplexed on-line sample preparation with capillary electrophoresis for DNA sequencing
The purpose of this research is to develop a multiplexed sample processing system in conjunction with multiplexed capillary electrophoresis for high-throughput DNA sequencing. The concept from DNA template to called bases was first demonstrated with a manually operated single capillary system. Later, an automated microfluidic system with 8 channels based on the same principle was successfully constructed. The instrument automatically processes 8 templates through reaction, purification, denaturation, pre-concentration, injection, separation and detection in a parallel fashion. A multiplexed freeze/thaw switching principle and a distribution network were implemented to manage flow direction and sample transportation. Dye-labeled terminator cycle-sequencing reactions are performed in an 8-capillary array in a hot air thermal cycler. Subsequently, the sequencing ladders are directly loaded into a corresponding size-exclusion chromatographic column operated at {approximately} 60 C for purification. On-line denaturation and stacking injection for capillary electrophoresis is simultaneously accomplished at a cross assembly set at {approximately} 70 C. Not only the separation capillary array but also the reaction capillary array and purification columns can be regenerated after every run. DNA sequencing data from this system allow base calling up to 460 bases with accuracy of 98%.
Date:
March 31, 1999
Creator:
Tan, H.
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 77, No. 130, Ed. 1 Wednesday, March 31, 1999
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 31, 1999
Creator:
Dobbs, Gary
Object Type:
Newspaper
System:
The Portal to Texas History
A Cercla-Based Decision Model to Support Remedy Selection for an Uncertain Volume of Contaminants at a DOE Facility
The Paducah Gaseous Diffusion Plant (PGDP) operated by the Department of Energy is challenged with selecting the appropriate remediation technology to cleanup contaminants at Waste Area Group (WAG) 6. This research utilizes value-focused thinking and multiattribute preference theory concepts to produce a decision analysis model designed to aid the decision makers in their selection process. The model is based on CERCLA's five primary balancing criteria, tailored specifically to WAG 6 and the contaminants of concern, utilizes expert opinion and the best available engineering, cost, and performance data, and accounts for uncertainty in contaminant volume. The model ranks 23 remediation technologies (trains) in their ability to achieve the CERCLA criteria at various contaminant volumes. A sensitivity analysis is performed to examine the effects of changes in expert opinion and uncertainty in volume. Further analysis reveals how volume uncertainty is expected to affect technology cost, time and ability to meet the CERCLA criteria. The model provides the decision makers with a CERCLA-based decision analysis methodology that is objective, traceable, and robust to support the WAG 6 Feasibility Study. In addition, the model can be adjusted to address other DOE contaminated sites.
Date:
March 31, 1999
Creator:
Kerschus, Christine E.
Object Type:
Report
System:
The UNT Digital Library
The Clifton Record (Clifton, Tex.), Vol. 104, No. 26, Ed. 1 Wednesday, March 31, 1999
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
March 31, 1999
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Coal and char studies by advanced EMR techniques
Advanced magnetic resonance (EMR) methods are used to examine properties of coals, chars, and molecular species related to constituents of coal. During this grant period, further progress was made on proton NMR and low-frequency dynamic nuclear polarization (DNP) to examine the interaction between fluids such as water and the surface of suspended char particles. Effects of char particle size and type on water nuclear spin relaxation, T2, were measured and modeled.
Date:
March 31, 1999
Creator:
Belford, R. L.; Clarkson, R. B. & Odintsov, B. M.
Object Type:
Report
System:
The UNT Digital Library
The Collegian (Hurst, Tex.), Vol. 11, No. 21, Ed. 1 Wednesday, March 31, 1999
Weekly student newspaper published in Hurst, Texas serving the Tarrant County Junior College District that includes school news and information along with advertising.
Date:
March 31, 1999
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Colony Courier (The Colony, Tex.), Vol. 2, No. 21, Ed. 1 Wednesday, March 31, 1999
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
March 31, 1999
Creator:
Chiniewicz, Susan
Object Type:
Newspaper
System:
The Portal to Texas History
Comparison of F(2)-Based Gases for High-Rate Dry Etching of Si
Four different F{sub 2}-based gases (SF{sub 6}, NF{sub 3}, PF{sub 5}, and BF{sub 3}) were examined for high rate Inductively Coupled Plasma etching of Si. Etch rates up to {approximately}8 {micro}m/min were achieved with pure SF{sub 6} discharges at high source power (1500W) and pressure (35mTorr). A direct comparison of the four feedstock gases under the same plasma conditions showed the Si etch rate to increase in the order BF{sub 3} < NF{sub 3} < PF{sub 5} < SF{sub 6}. This is in good correlation with the average bond energies of the gases, except for NF{sub 3}, which is the least strongly bound. Optical emission spectroscopy showed that the ICP source efficiently dissociated NF{sub 3}, but the etched Si surface morphologies were significantly worse with this gas than with the other 3 gases.
Date:
March 31, 1999
Creator:
Donahue, J.; Hahn, Y.B.; Hays, D.C.; Johnson, D.; Jung, K.B.; Lambers, E.S. et al.
Object Type:
Article
System:
The UNT Digital Library
A comprehensive study of fracture patterns and densities in the Geysers geothermal reservoir using microearthquake shear-wave splitting tomography. Quarterly report for Sep-Dec 1998
We start organizing the computer programs needed for crack density inversion into an easy to follow scripts. These programs were collection of bits and pieces from many sources and we want to organize those separate programs into coherent product. We also gave a presentation (enclosed) in the Twenty-Fourth Workshop on Geothermal Reservoir Engineering in Stanford University on our Geyser and Mammoth results.
Date:
March 31, 1999
Creator:
Malin, Peter E. & Shalev, Eylon
Object Type:
Report
System:
The UNT Digital Library
Confidentiality of Tax Data: IRS' Implementation of the Taxpayer Browsing Protection Act
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the Internal Revenue Service's (IRS) implementation of the Taxpayer Browsing Protection Act, focusing on: (1) actions IRS has taken to implement the law; and (2) the number of potential and proven incidents of unauthorized access by IRS employees that IRS has identified since enactment of the law, as well as penalties imposed in cases where unauthorized access was proven."
Date:
March 31, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Cruise Missile Defense: Progress Made but Significant Challenges Remain
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the Department of Defense's (DOD) progress in establishing adequate mechanisms for coordinating cruise missile defense programs, focusing on the: (1) organizational structure and mechanisms for coordinating cruise missile defense efforts; (2) potential measures of the progress of coordination efforts; (3) progress of coordination using these measures; (4) challenges that DOD officials believe still must be overcome; and (5) defense against land attack cruise missiles."
Date:
March 31, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
The Cuero Record (Cuero, Tex.), Vol. 105, No. 13, Ed. 1 Wednesday, March 31, 1999
Weekly newspaper from Cuero, Texas that includes local, state, and national news along with advertising.
Date:
March 31, 1999
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Defense Acquisitions: DOD Efforts to Develop Laser Weapons for Theater Defense
A chapter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the Department of Defense's (DOD) programs to develop laser weapons for missile defense, focusing on: (1) what laser weapons are being considered for missile defense and the coordination among the program offices developing the systems; (2) the status and cost of each system; and (3) the technical challenges each system faces as determined by DOD program managers and analysts and other laser system experts."
Date:
March 31, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Defense Inventory: Navy's Procedures for Controlling In-Transit Items Are Not Being Followed
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed selected aspects of the Navy's management procedures for controlling items in transit, focusing on the: (1) reported value and types of inventory in transit within and between storage and repair activities, vendors, and end users that were unaccounted for (or lost); and (2) Navy's adherence to procedures for controlling such in-transit inventory."
Date:
March 31, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
DEVELOPMENT OF A CALCIUM-BASED SORBENT FOR HOT GAS CLEANUP
The preparation and testing of potential sorbents for removing H{sub 2}S and COS from hot coal gas continued. Two preparation methods received the most consideration. Both methods involve pelletizing powders in a revolving drum under moist conditions followed either by heat treatment or steam curing to harden the pellets, depending on the particle bonding mechanism. One method was used to pelletize mixtures of calcium carbonate and either alumina or a calcium aluminate cement in a single step. Another method was used to pelletize powdered limestone in an initial step followed by the application of a coating consisting of both limestone and a hydraulic cement in a second step. By employing this method, an especially promising material was produced consisting of a limestone core surrounded by a shell consisting initially of 80 wt.% limestone and 20% wt.% calcium aluminate cement. The best material exhibited both an acceptable crushing strength and adsorption capacity for H{sub 2}S.
Date:
March 31, 1999
Creator:
Wheelock, T. D.; Doraiswamy, L. K. & Constant, K.
Object Type:
Report
System:
The UNT Digital Library