Partner
UNT Libraries Government Documents Department
250
UNT Libraries Special Collections
64
Oklahoma Historical Society
41
UNT Libraries
17
National Museum of the Pacific War/Admiral Nimitz Foundation
11
Sterling Municipal Library
10
Carl Albert Congressional Research and Studies Center
8
Abilene Christian University Library
4
Patrick Heath Public Library
4
Nellie Pederson Civic Library
3
59 More
Collection
Office of Scientific & Technical Information Technical Reports
128
Texas Digital Newspaper Program
114
Congressional Research Service Reports
68
Oklahoma Digital Newspaper Program
51
Tocker Foundation Grant
48
University Photography Collection
41
Photographing UNT
41
Government Accountability Office Reports
35
Texas Laws and Resolutions Archive
17
LGBT Collections
13
98 More
Degree Department
Degree Discipline
Degree Level
Country
States
Decade
Month
Day
Language
502 Matching Results
Results open in a new window/tab.
Results:
1 - 24 of
502
next
An Adaptive B-Spline Method for Low-order Image Reconstruction Problems - Final Report - 09/24/1997 - 09/24/2000
A common problem in signal processing is to estimate the structure of an object from noisy measurements linearly related to the desired image. These problems are broadly known as inverse problems. A key feature which complicates the solution to such problems is their ill-posedness. That is, small perturbations in the data arising e.g. from noise can and do lead to severe, non-physical artifacts in the recovered image. The process of stabilizing these problems is known as regularization of which Tikhonov regularization is one of the most common. While this approach leads to a simple linear least squares problem to solve for generating the reconstruction, it has the unfortunate side effect of producing smooth images thereby obscuring important features such as edges. Therefore, over the past decade there has been much work in the development of edge-preserving regularizers. This technique leads to image estimates in which the important features are retained, but computationally the y require the solution of a nonlinear least squares problem, a daunting task in many practical multi-dimensional applications. In this thesis we explore low-order models for reducing the complexity of the re-construction process. Specifically, B-Splines are used to approximate the object. If a ''proper'' collection B-Splines are …
Date:
April 11, 2000
Creator:
Li, Xin; Miller, Eric L.; Rappaport, Carey & Silevich, Michael
Object Type:
Report
System:
The UNT Digital Library
The Advanced Petroleum-Based Fuels Program DECSE and APBF Overview
The following topics are summarized: Role of fuel blends in controlling engine-out emissions; Effect of fuels and lubricants on emission control devices; and Effect of fuels and lubricants on vehicle emissions and operations.
Date:
April 11, 2000
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
Advanced reservoir characterization and evaluation of CO{sub 2} gravity drainage in the naturally fractured Spraberry Trend Area, Class III
The overall goal of this project was to assess the economic feasibility of CO{sub 2} flooding the naturally fractured Spraberry Trend Area in West Texas. This objective was accomplished by conducting research in four areas: (1) extensive characterization of the reservoirs, (2) experimental studies of crude oil/brine/rock (COBR) interaction in the reservoirs, (3) analytical and numerical simulation of Spraberry reservoirs, and, (4) experimental investigations on CO{sub 2} gravity drainage in Spraberry whole cores. This report provides results of the fourth year of the five-year project for each of the four areas including a status report of field activities leading up to injection of CO{sub 2}.
Date:
April 11, 2000
Creator:
Heckman, Tracy & Schechter, David S.
Object Type:
Report
System:
The UNT Digital Library
Aggregation quenching in thin films of meh-ppv studied by near-field scanning optical microscopy and spectroscopy
Aggregates in thin films of conjugated polymers form excimer states and significantly reduce the photo- and electroluminescence efficiency in devices produced from these materials. We have studied the aggregate formation in thin films of MEH-PPV by near-field scanning optical microscopy and spectroscopy. Local photoluminescence spectroscopy and photo-bleaching experiments have been used to show that thin films of MEH-PPV are homogeneously aggregated and do not form aggregated domains.
Date:
April 11, 2000
Creator:
Huser, T & Yan, M
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 101, No. 24, Ed. 1 Tuesday, April 11, 2000
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 11, 2000
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Analytical Review
ANL Performs Independent Review for DOE on the following topics: (1) Systematic analysis--Depends on question asked; (2) Compare technologies and pathways--Examples: (a) fuels, power plant technologies, vehicle materials; (b) Total lifecycle analysis reveals national and global impacts; and (3) Direction of R&D to most fruitful areas.
Date:
April 11, 2000
Creator:
Stodolsky, Frank
Object Type:
Article
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 78, No. 140, Ed. 1 Tuesday, April 11, 2000
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
April 11, 2000
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Biodiesel: The clean, green fuel for diesel engines (fact sheet)
Natural, renewable resources such as vegetable oils and recycled restaurant greases can be chemically transformed into clean-burning biodiesel fuels. As its name implies, biodiesel is like diesel fuel except that it's organically produced. It's also safe for the environment, biodegradable, and produces significantly less air pollution than diesel fuel.
Date:
April 11, 2000
Creator:
Tyson, K.S.
Object Type:
Book
System:
The UNT Digital Library
The Boerne Star (Boerne, Tex.), Vol. 95, No. 29, Ed. 1 Tuesday, April 11, 2000
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
April 11, 2000
Creator:
Keasling, Edna & Fierro, Jennifer
Object Type:
Newspaper
System:
The Portal to Texas History
Bottom/Side Lift Gantry Conceptual Design Rev. 01
The purpose of this task is to update the existing bottom/side lift gantry analysis so that the design is consistent with Enhanced Design Alternative II (EDA II) design constraints listed in the Monitored Geologic Repository Project Description Document (CRWMS M and O 1999a, Section 2.2.1.1, p. 9a). This update is consistent with the requirements of the Technical Guidance Document for License Application Preparation (YMP 1999, Section 6.2.5.1). This update will also take into account the latest available equipment classification and Waste Emplacement/Retrieval System Description Document (SDD) (CRWMS M and O 2000c) requirements. The principal objective of this analysis is to verify that the newly developed bottom/side lift gantry concept continues to be a suitable design concept for the current Monitored Geologic Repository (MGR) design. This analysis includes an examination of the waste package (WP) transfer operation at the emplacement drift transfer dock. In addition, this analysis verifies that the gantry is compatible with the WP transporter, which has been redesigned to handle WPs sitting on pallets (CRWMS M and O 2000a). The scope of this work is to examine the existing analysis and to determine what, if any, modifications to the analysis may be required as a result of additional …
Date:
April 11, 2000
Creator:
Bair, P.S.
Object Type:
Report
System:
The UNT Digital Library
Brady Herald (Brady, Tex.), Vol. 57, No. 22, Ed. 1 Tuesday, April 11, 2000
Weekly newspaper from Brady, Texas that includes local, state, and national news along with advertising.
Date:
April 11, 2000
Creator:
Stewart, James E.
Object Type:
Newspaper
System:
The Portal to Texas History
A case study in modeling company policy documents as a source of requirements
This paper describes an approach that was developed to produce structured models that graphically reflect the requirements contained within a text document. The document used in this research is a draft policy document governing business in a research and development environment. In this paper, the authors present a basic understanding of why this approach is needed, the techniques developed, lessons learned during modeling and analysis, and recommendations for future investigation. The modeling method applied on the policy document was developed as an extension to entity relationship (ER) diagrams, which built in some structural information typically associated with object-oriented techniques. This approach afforded some structure as an analysis tool, while remaining flexible enough to be used with the text document. It provided a visual representation that allowed further analysis and layering of the model to be done.
Date:
April 11, 2000
Creator:
CRUMPTON,KATHLEEN MARIE; GONZALES,REGINA M. & TRAUTH,SHARON L.
Object Type:
Article
System:
The UNT Digital Library
Comparison of the electrochemical properties of several commercial graphites with a templated disordered carbon
A templated carbon was prepared by the pyrolysis of pyrene impregnated into pillared clay (PILC). The electrochemical performance of this was evaluated with the goal of using this material as an anode in Li-ion cells. The reversible capacity was measured as a function of C rate and the cycling characteristics were determined for various intercalation protocols. The performance of this material was compared to that of several commercial graphites tested under the same conditions. The PILC carbon shows great promise as a Li-ion anode if the fade and first-cycle losses can be controlled.
Date:
April 11, 2000
Creator:
Guidotti, R. A.; Reinhardt, F. W. & Sandi, G.
Object Type:
Article
System:
The UNT Digital Library
A database prototype has been developed to help understand costs in photovoltaic systems
High photovoltaic (PV) system costs hinder market growth. An approach to studying these costs has been developed using a database containing system, component and maintenance information. This data, which is both technical and non-technical in nature, is to be used to identify trends related to costs. A pilot database exists at this time and work is continuing. The results of this work may be used by the data owners to improve their operations with the goal of sharing non-attributable information with the public and industry at large. The published objectives of the DOE PV program are to accelerate the development of PV as a national and global energy option, as well as ensure US technology and global market leadership. The approach to supporting these objectives is to understand what drives costs in PV applications. This paper and poster session describe work-in-progress in the form of a database that will help identify costs in PV systems. In an effort to address DOE's Five-Year PV Milestones, a program was established in the summer of 1999 to study system costs in three PV applications--solar home lighting, water pumping, and grid-tied systems. This work began with a RFQ requesting data from these types of …
Date:
April 11, 2000
Creator:
MOORE,LARRY M.
Object Type:
Article
System:
The UNT Digital Library
DCPT: A dual-continua random walk particle tracker fortransport
Accurate and efficient simulation of chemical transport processes in the unsaturated zone of Yucca Mountain is important to evaluate the performance of the potential repository. The scale of the unsaturated zone model domain for Yucca Mountain (50 km{sup 2} area with a 600 meter depth to the water table) requires a large gridblock approach to efficiently analyze complex flow & transport processes. The conventional schemes based on finite element or finite difference methods perform well for dispersion-dominated transport, but are subject to considerable numerical dilution/dispersion for advection-dominated transport, especially when a large gridblock size is used. Numerical dispersion is an artificial, grid-dependent chemical spreading, especially for otherwise steep concentration fronts. One effective scheme to deal with numerical dispersion is the random walk particle method (RWPM). While significant progress has been made in developing RWPM algorithms and codes for single continuum systems, a random walk particle tracker, which can handle chemical transport in dual-continua (fractured porous media) associated with irregular grid systems, is still absent (to our knowledge) in the public domain. This is largely due to the lacking of rigorous schemes to deal with particle transfer between the continua, and efficient schemes to track particles in irregular grid systems. The …
Date:
April 11, 2000
Creator:
Pan, L.; Liu, H.H.; Cushey, M. & Bodvarsson, G.S.
Object Type:
Report
System:
The UNT Digital Library
A discussion on life-cycle costs of residential photovoltaic systems
This paper discusses the characteristics and needed improvements/enhancements required for the expansion of the grid-tied residential power systems market. The purpose of the paper is to help establish a common understanding, between the technical community and the customers of the technology, of value and costs and what is required in the longer term for reaching the full potential of this application.
Date:
April 11, 2000
Creator:
THOMAS,MICHAEL G. & CAMERON,CHRISTOPHER P.
Object Type:
Article
System:
The UNT Digital Library
DOE/OHVT Natural Gas Vehicle Fueling Infrastructure Program
None
Date:
April 11, 2000
Creator:
Stork, Kevin C.
Object Type:
Presentation
System:
The UNT Digital Library
Engineering Annual Summary 1999
In 1999, Engineering at Lawrence Livermore National Laboratory faced competing priorities to meet critical project milestones, insistent pressures to restructure internally to promote long-term technological growth, and immediate demands to reassign employees as major projects terminated and new ones emerged. This drive for change occurred among an unprecedented level of turmoil within the nuclear weapons design and manufacturing community. I believe the technical problems were more demanding this year and the environment within which they were accomplished more challenging, pushing us to accomplish more during greater turbulence than any other time in my tenure here. I am pleased to report that we met many key milestones and achieved numerous technological breakthroughs. In the project support areas, demands presented by our customers shifted significantly over the year. In the lasers area, we continued the detailed designs for the over $1 billion National Ignition Facility (NIF) super laser, paving the way for the procurement of components and structures for what is probably the largest high-tech construction project in the world. This work was undertaken in an environment of significant management and structural changes, with increased reporting requirements from the Department of Energy, starting in the middle of 1999. Despite these changes, our …
Date:
April 11, 2000
Creator:
Dimolitsas, S. & Gerich, C.
Object Type:
Report
System:
The UNT Digital Library
Engineering Work Plan for the Development of Phased Startup Initiative (PSI) Phases 3 and 4 Test Equipment
A number of tools and equipment pieces are required to facilitate planned test operations during Phases 3 and 4 of the Phased Startup Initiative (PSI). These items will be used in assessing residual canister sludge quantities on cleaned fuel assemblies, sorting coarse and fine scrap fuel pieces, assessing the size distribution of scrap pieces, loading scrap into a canister, and measuring the depth of the accumulated scrap in a canister. This work plan supercedes those previously issued for development of several of these test items. These items will be considered prototype equipment until testing has confirmed their suitability for use in K West Basin. The process described in AP-EN-6-032 will be used to qualify the equipment for facility use. These items are considered non-OCRWM for PSI Phase 3 applications. The safety classification of this equipment is General Service, with Quality Level 0 (for PSI Phase 3). Quality Control inspections shall be performed to verify basic dimensions and overall configurations of fabricated components, and any special quality control verifications specified in this work plan (Section 3.1.5). These inspections shall serve to approve the test equipment for use in K West Basin (Acceptance Tag). This equipment is for information gathering only during …
Date:
April 11, 2000
Creator:
Pitner, A. L.
Object Type:
Report
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Tuesday, April 11, 2000
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 11, 2000
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Federal Buildings: Billions Are Needed for Repairs and Alterations
Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed the results of its work on the General Services Administration's (GSA) Repairs and Alterations Program, focusing on: (1) the extent of repairs and alterations that have been identified at government-owned buildings managed by GSA; (2) factors that impede GSA's ability to satisfy its repair and alteration requirements; and (3) GSA's efforts to improve its management of repairs and alterations."
Date:
April 11, 2000
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Finding Bent-double Radio Galaxies: A Case Study in Data Mining
This paper presents our early results in applying data mining techniques to the problem of finding radio-emitting galaxies with a bent-double morphology. In the past, astronomers on the FIRST (Faint Images of the Radio Sky at Twenty-cm) survey have detected such galaxies by first inspecting the radio images visually to identify probable bent-doubles, and then conducting observations to confirm that the galaxy is indeed a bent-double. Our goal is to replace this visual inspection by a semi-automated approach. In this paper, we present a brief overview of data mining, describe the features we use to discriminate bent-doubles from non-bent-doubles, and discuss the challenges faced in defining meaningful features in a robust manner. Our experiments show that data mining, using decision trees, can indeed be a viable alternative to the visual identification of bent-double galaxies.
Date:
April 11, 2000
Creator:
Fodor, I.K; Cantu-Paz, E.; Kamath, C. & Tang, N.
Object Type:
Article
System:
The UNT Digital Library
Forest Service: Broad-Scale Assessments Could Be Better Integrated Into the Forest Planning Process
Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed the Forest Service's forest plans, focusing on the: (1) role of broad-scale assessments in the agency's planning process; (2) lessons that have been learned about conducting such assessments; and (3) importance of holding Forest Service managers accountable for integrating the assessments into their planning processes."
Date:
April 11, 2000
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Fuel Retrieval System Design Verification Report
The Fuel Retrieval Subproject was established as part of the Spent Nuclear Fuel Project (SNF Project) to retrieve and repackage the SNF located in the K Basins. The Fuel Retrieval System (FRS) construction work is complete in the KW Basin, and start-up testing is underway. Design modifications and construction planning are also underway for the KE Basin. An independent review of the design verification process as applied to the K Basin projects was initiated in support of preparation for the SNF Project operational readiness review (ORR). A Design Verification Status Questionnaire, Table 1, is included which addresses Corrective Action SNF-EG-MA-EG-20000060, Item No.9 (Miller 2000).
Date:
April 11, 2000
Creator:
Groth, B. D.
Object Type:
Report
System:
The UNT Digital Library