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1
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1
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1
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9
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1
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1
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Series 5: Correspondence: July - December, 1991
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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
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.B0106.0659]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "This town recently received 2,000 square feet of new, steel-reinforced concrete bridge."
Date:
August 2, 1991
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0114.0459]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Jerry Buckles of the Moore Aquatic Club wins his heat in the 100-meter breaststroke at the Oklahoma Junior Olympic Swimming Championships."
Date:
August 2, 1991
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0338.0944]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Stillwater second baseman David Kerr forces Enid's Jerod Stidham at second and throws to first to try and turn the double play during Friday's first round of the American Legion major tournament at Edmond."
Date:
August 2, 1991
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Texas Register, Volume 16, Number 57, Pages 4193-4244, August 2, 1991
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
August 2, 1991
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
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:
Thesis or Dissertation
System:
The UNT Digital Library
Conventional Arms Transfers to the Third World, 1983-1990
None
Date:
August 2, 1991
Creator:
Grimmett, Richard F.
Object Type:
Report
System:
The UNT Digital Library
The Hopkins County Echo (Sulphur Springs, Tex.), Vol. 116, No. 31, Ed. 1 Friday, August 2, 1991
Weekly newspaper from Sulphur Springs, Texas that includes local, state, and national news along with advertising.
Date:
August 2, 1991
Creator:
Keys, Clarke & Davis, Mary Grant
Object Type:
Newspaper
System:
The Portal to Texas History
[Letter from Suzy Wagers to the Texas Human Rights Foundation Trustees, August 2, 1991]
Letter from Suzy Wagers to the Texas Human Rights Foundation Board of Trustees discussing a few miscellaneous updates, such as a trustee's surgery, fundraising, and committee position requests.
Date:
August 2, 1991
Creator:
Wagers, Suzy
Object Type:
Letter
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 69, No. 236, Ed. 1 Friday, August 2, 1991
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
August 2, 1991
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
[Historic Property, Photograph 710-08]
Photograph of a historic property located at 4320 Second in Dallas, Texas.
Date:
August 2, 1991
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Historic Property, Photograph 694-02]
Photograph of a historic property located at 3609 S Lamar in Dallas, Texas.
Date:
August 2, 1991
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Historic Property, Photograph 699-02]
Photograph of a historic property located at 2210 Pine in Dallas, Texas.
Date:
August 2, 1991
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Historic Property, Photograph 696-02]
Photograph of a historic property located at 3028 S Oakland in Dallas, Texas.
Date:
August 2, 1991
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Photograph 2012.201.B0351.0154]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Rear Adm. William J. Ecker, right, commander of the 2nd Coast Guard District, addresses a crowd at the Federal Aviation Center during a command change ceremony for outgoing commander Harvey Langholtz, left."
Date:
August 2, 1991
Creator:
Gooch, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1076.0336]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Nelle Randle celebrates her 100th birthday with family and friends at the Spanish Cove Retirement Home, Yukon. More than 90 people attended her party. Randle was born Aug. 2, 1891."
Date:
August 2, 1991
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1103.0959]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Edmond Concilman Ron Mercer, left, compares a jar of unprocessed medical waste to a jar of processed waste turned ito plastic chips, while inventor Rolf Roland shows off products made from the chips."
Date:
August 2, 1991
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1103.0960]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Edmond Concilman Ron Mercer, left, compares a jar of unprocessed medical waste to a jar of processed waste turned ito plastic chips, while inventor Rolf Roland shows off products made from the chips."
Date:
August 2, 1991
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1188.0043]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Roland M. Smith has been named vice president for sutdent affairs for the University of Oklahoma's Norman campus."
Date:
August 2, 1991
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Historic Property, Photograph 689-05]
Photograph of a historic property located at 3107 Holmes in Dallas, Texas.
Date:
August 2, 1991
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Historic Property, Photograph 689-13]
Photograph of a historic property located at 3110 Holmes in Dallas, Texas.
Date:
August 2, 1991
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Historic Property, Photograph 692-02]
Photograph of a historic property located at 1400 Martin Luther King in Dallas, Texas.
Date:
August 2, 1991
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Historic Property, Photograph 692-12]
Photograph of a historic property located at 2503 Martin Luther King in Dallas, Texas.
Date:
August 2, 1991
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History