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Some general properties of stimulated Raman propagation with pump depletion, transiency and dispersion
This note considers some of the properties of the Stokes pulse that grows from a specified seed pulse in the presence of a strong pump pulse as it propagates through a dispersive atomic vapor. We first present an generic dimensionless form for the coupled equations that govern the propagation of pump and Stokes fields or collinear plane-wave pulses. By treating the two fields we permit pump depletion. We include transient atomic response (as embodied in the Raman coherence), but neglect changes in atomic populations. (Thus our equations pertain to the regime in which atoms are more numerous than photons). The equations employ a gain length, a dispersion time {tau}{sub dis}, and a Raman coherence time (or memory time) {tau}{sub R} as basic parameters: these two times, together with a single-photon stationary-atom detuning {Delta}, subsume the details of a particular atomic Raman transition and particular operating conditions. (The effects of Doppler shifts enters the equations through the coherence time). We discuss some general properties of these generic Raman propagation equations, and present illustrations of their solutions in the absence of dispersion. We comment on departures from exponential growth. We than show examples of behavior when dispersion is present and the pump …
Date:
August 2, 1991
Creator:
Shore, B. W.; Lowder, S. & Johnson, M. A.
Object Type:
Report
System:
The UNT Digital Library
Development of an experimental database and theories for prediction of thermodynamic properties of aqueous electrolytes and nonelectrolytes of geochemical significance at supercritical temperatures and pressures
Volumetric measurements have been completed for CH{sub 4}, CO{sub 2}, and H{sub 2}S at temperatures from 25{degrees}C to 380{degrees}C and 2 or 3 pressures at each temperature. The H{sub 2}S and CO{sub 2} solutions are stored in aluminized mylar bags in PVC pipes with water surrounding the bags at a pressure of several atmospheres. The methane is stored in a one liter autoclave with a sliding teflon piston engaging the sides of the autoclave which separates the standard methane solution from the pressurizing fluid. The solutions are prepared at 100 to 200 atmospheres and do not need to be re-standardized after each experiment. We also have some measurements on aqueous ammonia, boric acid, and acetic acid. Preliminary calculations of the free energy of methane in water at room temperature as a function of the model parameters for the methane have been finished. In preparation for these calculations, the theory and practice of the free energy perturbation calculations was reviewed. In molecular dynamics and Monte Carlo calculations a system does not immediately equilibrate to a change in the Hamiltonian, so that there is a time lag or a configuration number lag in the response of the system. These lags cause errors …
Date:
May 2, 1991
Creator:
Wood, R.H.
Object Type:
Report
System:
The UNT Digital Library
International petroleum statistics report, September 1991
The International Petroleum Statistics Report is a monthly publication that provides current international oil data. This report is published for the use of members of Congress, federal agencies, state agencies, industry, and the general public. Publication of this report is in keeping with responsibilities given the Energy Information Administration in Public Law 95-91 (Section 205(a)(2)). The International Petroleum Statistics Report presents data on international oil production, consumption, imports, exports, and stocks. The report has three sections. Section 1 contains time series on world oil production, and on oil consumption and stocks in the Organization for Economic Cooperation and Development (DECD). This section contains annual data beginning in 1973, and monthly data for the most recent two years. Section 2 presents an oil supply/consumption balance for the market economies (i.e. non-communist countries). This balance is presented in quarterly intervals for the most recent two years. Section 3 presents data on oil imports by DECD countries. This section contains annual data beginning in 1982, and quarterly data for the most recent two years. 41 tabs.
Date:
October 2, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
WACC-WTG Review Comment Sheets
This report is a letter about a review of the Quality Assurance Project Plan for the INEL Waste Isolation Pilot Plant Waste Characterization Project.'' The author of the letter recommended the approval of the quality assurance program. However in his review, several observations were made and were requested to be added to the program. Examples of these observations were safety of personnel involved in the program, safe characterization of hazardous materials studied, quality of calibrations required for measurement objectives, and reporting of hazardous sampling. (MB)
Date:
April 2, 1991
Creator:
Spencer, W. A.
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0076.0302]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
July 2, 1991
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0135.0606]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Doug Clark grabs hold during the calf roping event Saturday afternoon."
Date:
March 2, 1991
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Synthesis of a naphthalene-hydroxynaphthalene polymer model compound
The objective of this project was the synthesis of one pound of a new naphthalene-hydroxynaphthalene polymer model compound for use in coal combustion studies. Since this compound was an unreported compound, this effort also required the development of a synthetic route to this compound (including routes to the unique and unreported intermediates leading to its synthesis).
Date:
October 2, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Optical analogs of model atoms in fields
The equivalence of the paraxial wave equation to a time-dependent Schroedinger equation is exploited to construct optical analogs of model atoms in monochromatic fields. The approximation of geometrical optics provides the analog of the corresponding classical mechanics. Optical analogs of Rabi oscillations, photoionization, stabilization, and the Kramers-Henneberger transformation are discussed. One possibility for experimental realization of such optical analogs is proposed. These analogs may be useful for studies of quantum chaos'' when the ray trajectories are chaotic. 9 refs.
Date:
May 2, 1991
Creator:
Milonni, P.W.
Object Type:
Article
System:
The UNT Digital Library
Topics in particle physics and cosmology
The Standard Model of particle physics, together with the Big Bang model of the early universe, constitute a framework which encompasses our current understanding of fundamental laws and beginning of our universe. Despite recent speculative trends, quantum field theory remains the theoretical tool of choice for investigating new physics either at high energy colliders, or in the early universe. In this dissertation, several field theoretic phenomena relevant to cosmology or particle physics are explored. A common theme in these explorations is the structure of the vacuum state in quantum field theory. First, we discuss first-order phase transitions in the early universe, in which the effective vacuum state of the universe shifts discontinuously as the temperature drops below some critical point. We find that the dynamics of a certain type of first-order phase transition can lead to production of primordial black holes, which could constitute the dark matter of our universe. Alternatively, supercooled first-order phase transitions may be the cause of an extended inflationary epoch in the early universe, which is generally regarded as necessary to solve several cosmological puzzles. We derive limits on such scenarios based on nearly model-independent percolation properties of the transition. We also study some nonperturbative aspects …
Date:
August 2, 1991
Creator:
Hsu, S.D.H.
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0249.0432]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Claude Harris stops at the vo-tech school where he teaches ground school."
Date:
December 2, 1991
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0258.0553]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Some of Liz Curtis Higgs' personal observations on the stages of a woman's life."
Date:
June 2, 1991
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0264.0842]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Hospitals - City - Presbyterian Hospital"
Date:
July 2, 1991
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0247.0184]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Dr. and Mr. Christian Ramsey, left, and Mr. and Mrs. Royce Hammons examine a floral display at Heart Ball."
Date:
February 2, 1991
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0262B.0573]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Sir Magnum Cody gets a touch-up Monday from owner and rider Robin Cannon of Seattle before appearing in the National Reining Horse Futurity."
Date:
December 2, 1991
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0262B.0445]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Victoria Ennis, the highest point winner in a non-professional category in Oklahoma last year, works with Devils Reward at the national Appaloosa show."
Date:
July 2, 1991
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0260.0392]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "This westbound-only placard was added after motorists called to express surprise that they couldn't get to the Kilpatrick Turnpike's eastbound lanes."
Date:
December 2, 1991
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0249.0433]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "PURCELL - Looking ahead to war, the country needed men."
Date:
December 2, 1991
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0326.0193]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Clyde Kendall, Tishomingo, Pres. Murray State College"
Date:
April 2, 1991
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0250.1018]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "For a Norman author, writing is an "essential part" of life, a concept that become apparent recently when he was one of six authors named to the first Oklahoma Professional Writers Hall of Fame ."
Date:
December 2, 1991
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0261B.0343]
Photograph used for a story in the Daily Oklahoman newspaper.
Date:
April 2, 1991
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0154.0022]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Mon Helps Son Earn Diploma -- Barbara Davidson prepared to take notes recently for son Bryan, a paraplegic Rose State College student who will be awarded a diploma in graduation ceremonies today."
Date:
May 2, 1991
Creator:
Gooch, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0152.0511]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Performing dance aerobics recently in Norman are the Dancin' Grannies, Bernie Dupler, front, and Beverly Gemigniani, back left."
Date:
March 2, 1991
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0155.0079]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Davis, Sandi / Staff Writer"
Date:
July 2, 1991
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0553.0646]
Caption: "Rick Hodgins, left, managing partner of The Plastics Co. Inc., shows investor Dave Bronstad and employee Melody Lusk the firm's major product, a video library case mass produced by an injection molding machine."
Date:
May 2, 1991
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History