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475 Matching Results
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Broadband diffractive lens
Significant progress has been made toward solving the century-old problem of chromatic aberrations in diffractive optics. Our approach exploits modern materials and microfabrication technology and is very different from the purely diffractive strategy,'' which is commonly employed and which results in multiple diffractive elements separated by a finite distance. We have developed a Fresnel zone plate lens comprised of a serial stack of patterned minus-filters which allows broadband radiation to be focused (or imaged) without longitudinal or transverse chromatic aberrations. 7 refs., 4 figs.
Date:
May 28, 1991
Creator:
Ceglio, N. M.; Hawryluk, A. M.; London, R. A.; Seppala, L. G. (Lawrence Livermore National Lab., CA (USA)) & Gaines, D. P. (Brigham Young Univ., Provo, UT (USA))
Object Type:
Article
System:
The UNT Digital Library
Feasibility study: Application of RCM techniques for substation maintenance at the Bonneville Power Administration. [Reliability Centered Maintenance (RCM)]
This feasibility study examines reliability centered maintenance (RCM) as it applies to Bonneville Power Administrations (BPA) substation maintenance program. Reliability techniques are examined in evaluated. Existing BPA equipment maintenance procedures are documented. Equipment failure history is considered. Economic impacts are estimated. Various equipment instrumentation methods are reviewed. Based on this analysis a prototype system is proposed. The prototype will be implemented in two phases. Phase 1 is to be completed in 1992, it includes instrumenting one power transformer and one oil circuit breaker. Software development will focus on displaying data. Phase 2 is to be completed the following year. The remaining transformers and breakers will be instrumented during the second phase. Software development will focus on predictive maintenance techniques and maintenance decision support.
Date:
May 28, 1992
Creator:
Purucker, S. L.; Tonn, B. E.; Goeltz, R. T.; James, R. D.; Kercel, S.; Rizy, D. T. et al.
Object Type:
Report
System:
The UNT Digital Library
Photogenerated carrier-induced reactions on uhv semiconductor surfaces
The objective for this experimental work was to examine the reaction mechanisms, half-collision dynamics, and other optically induced chemical effects, that are operable on a well characterized single-crystal semiconductor surface. Of particular interest were reactions induced by charge transfer from the semiconductor surface including hot carrier and thermalized carrier processes. The primary technique to measure the desorbed fragment translational energies was time-of-flight mass-spectroscopy, used in conjunction with a pulsed tunable laser source. The work was carried out in ultrahigh vacuum, thus other surface spectroscopies such as temperature-programmed desorption, (TPD), (LEED), etc. were used as needed. In the project, the photoreactions of several halogen-containing molecules on GaAs(110) surfaces have been investigated. The studies have made the first observations of several new photochemical processes on uhv prepared surfaces including intermolecular charge transfer; desorption by thermal-carrier-induced reactions (including the measurement of coverage-dependent changes in the translational energies of the desorbed products); interferometric oscillation of photoinduced reactions; and self-quenching of thermal carrier reactions on surfaces.
Date:
May 28, 1992
Creator:
Osgood, R.M. Jr.
Object Type:
Report
System:
The UNT Digital Library
Youth Mentoring Programs: Fiscal Year 1998
Correspondence issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed federal programs created to address the needs of at-risk and delinquent youths, focusing on: (1) identifying at-risk and delinquent youth programs that included mentoring as a type of service; (2) who administers the programs; (3) the objectives of the programs; and (4) the authorizing legislation for the programs."
Date:
May 28, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Budget Issues: Treasury's Interest Rate Calculation Changes
Correspondence issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reported on the Department of the Treasury's decision to change the calculation of the interest rates used since 1980 to determine the investment returns for a number of government trust funds, including Social Security and Medicare, focusing on: (1) how and why Treasury changed its rules for calculating interest rates in 1980 and 1998; (2) the effects of these changes on the unified budget and on the financial status of Social Security and Medicare trust funds; and (3) what other trust funds were affected by Treasury's decision."
Date:
May 28, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Federal Debt: Answers to Frequently Asked Questions--An Update
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO updated its report on frequently asked questions on the federal debt, focusing on: (1) how debt is defined and measured; (2) who holds federal debt; (3) how much it has grown in recent years; and (4) its significance to the national economy."
Date:
May 28, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Rural Water Projects: Identifying the Benefits of the Proposed Lewis and Clark Project
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the benefits of constructing the Lewis and Clark Rural Water Project, focusing on: (1) what benefits could derive from the Lewis and Clark project; (2) who could receive these benefits; and (3) how these benefits are valued."
Date:
May 28, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0146.0168]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "I bet there wasn't a dry eye in here when they told us," said Lilly Belle Cowan, 80, who has been a volunteer for 17 years."
Date:
May 28, 1993
Creator:
Faytinger, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0138.0354]
Photograph used for a story in the Daily Oklahoman newspaper.
Date:
May 28, 1992
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0140.0294]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Bob Colon, Daily Oklahoman sports editor."
Date:
May 28, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0161.0182]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "John Dewhirst / Holding a handful of weeds / former baseball coach Southeast High School."
Date:
May 28, 1992
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0162.0235]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Joe Diffie, Singer"
Date:
May 28, 1993
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0162.0234]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Joe, Diffie takes the stage in Tulsa for Tulsa for his high-energy show."
Date:
May 28, 1993
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0161.0181]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Former Southeast coach John Dewhirst laments the condition of the field where many baseball greats played in high school."
Date:
May 28, 1992
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0147.0285]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Rudy Cox, left, Mile Hickey, event chairman, background, and golf pro Don Maddox get ready."
Date:
May 28, 1992
Creator:
Hennigan, Vince
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Cooperative research in coal liquefaction
Significant progress was made in the May 1990--May 1991 contract period in three primary coal liquefaction research areas: catalysis, structure-reactivity studies, and novel liquefaction processes. A brief summary of the accomplishments in the past year in each of these areas is given.
Date:
May 28, 1991
Creator:
Huffman, G. P. & Sendlein, L. V. A. (eds.)
Object Type:
Report
System:
The UNT Digital Library
DC CICC retrofit magnet preliminary design, software development and analysis report
The January 1992 quarterly progress report discusses a two-dimensional finite element analysis (FEA) of the proposed retrofit MHD coil. The superconducting Cable-in-Conduit Conductor (CICC) winding pack has a smooth, semi-elliptical cross section and is supported by a similarly shaped strap which resists the electromagnetic forces tending to separate the coils on each side of the channel. The coils are designed to produce a peak on-axis field of 4.5 tesla with a nominal current density of 13.05{times}10{sup 6} A/m{sup 2}. A sketch of the magnet system and structure is shown in Fig. 1.0-1. The objective of this analysis is to quantify the highly 3-D characteristics of the proposed superconductivity magnet system, and develop an appropriate support concept. A fully paramatized 3-D finite element model of the coil and structure is developed as a means of obtaining the field and stress solutions. The flexibility of FEA and a model built using design parameters allows variations in the coil end turn bend radius, strap thickness, support details and positions to be studied. The preliminary results show the calculated stresses as a result of this iterative design process.
Date:
May 28, 1992
Creator:
Myatt, R. L. & Marston, P. G.
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0262.0022]
Photograph used for a story in the Daily Oklahoman newspaper.
Date:
May 28, 1992
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0261.0865]
Photograph used for a story in the Daily Oklahoman newspaper.
Date:
May 28, 1992
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0231.0647]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Mike Gugello, baseball"
Date:
May 28, 1992
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0268.0406]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Leslie Hudiburg, Kim Kluas and Debra Sanders, from left, wait for the fashion show."
Date:
May 28, 1993
Creator:
Gooch, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0254.0392]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Steven Heath / Asher 1st base & pitcher"
Date:
May 28, 1992
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0162.0240]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Joe Diffie, seated in his tour bus, relaxes a bit before going onstage in Tulsa."
Date:
May 28, 1993
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0156.0259]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Defense attorney Scott DeBoard, 15, a Central Mid-High student, said he became interested in participating because it "would give me a little bit more knowledge about the law and how our justice system works."
Date:
May 28, 1991
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History