Partner
UT San Antonio Libraries Special Collections
334
Oklahoma Historical Society
102
UNT Libraries Special Collections
80
UNT Libraries Government Documents Department
71
Texas Historical Commission
13
Sterling Municipal Library
9
UNT Libraries
7
Alvin Community College
3
Nellie Pederson Civic Library
3
Hopkins County Genealogical Society
3
58 More
Collection
Texas Cultures Online
334
Institute of Texan Cultures Texas Folklife Festival Collection
333
Texas Digital Newspaper Program
90
KXAS-NBC 5 News Collection
60
Office of Scientific & Technical Information Technical Reports
60
Oklahoma Publishing Company Photography Collection
56
Oklahoma Digital Newspaper Program
50
Tocker Foundation Grant
50
Chickasha Newspaper Collection
13
THC National Register Collection
13
96 More
Country
Decade
Month
Day
Language
699 Matching Results
Results open in a new window/tab.
Results:
1 - 24 of
699
next
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
[News Clip: Aylor]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
August 2, 1994, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Night out]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
August 2, 1994, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Payroll Taxes: Billions in Delinquent Taxes and Penalties Due But Unlikely to Be Collected
Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a legislative requirement, GAO discussed the results of its work on payroll taxes owed to the federal government and the associated trust fund recovery penalties (TFRP) assessed against individuals responsible for the nonpayment of these taxes."
Date:
August 2, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Unpaid Payroll Taxes: Billions in Delinquent Taxes and Penalty Assessments Are Owed
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on payroll taxes owed to the federal government and the associated trust fund recovery penalties assessed individuals responsible for the nonpayment of these taxes, focusing on the: (1) extent to which payroll taxes are not remitted to the federal government; (2) magnitude of the trust fund recovery penalties assessed against individuals of organizations that withheld federal payroll taxes from employees' salaries but did not forward them; (3) extent to which individuals who have not remitted payroll taxes are responsible for not paying these taxes at multiple businesses; (4) extent to which businesses and individuals who failed to pay payroll taxes are also receiving federal benefits or other federal payments; and (5) factors that affect the Internal Revenue Service's (IRS) ability to enforce compliance or pursue collections in this area."
Date:
August 2, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0155.0002]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Customers at McAnally's have a hard time understanding why the store changes a Guthrie sales tax."
Date:
August 2, 1990
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma 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:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0324.0253]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "When it comes to needlework, there seems to be nothing Mary Kehres hasn't mastered."
Date:
August 2, 1993
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0314B.0159]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Charles Jones, City, Children's TV Producer."
Date:
August 2, 1998
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0314B.0157]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Nikki Pinnapureddy, 10, Charles Jones are featured in "R. U. KIDding," a syndicated children's television show Jones created."
Date:
August 2, 1998
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0246.0591]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Louise Hamm, center, with other members of her Earthwatch expedition, travels to an island in Bahia de Los Angeles."
Date:
August 2, 1992
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[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.B0071.0575]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Oklahoma City 89ers Jeff Huson stands up, after stealing second base Tuesday night, as Omaha shortstop Edgar Caceres scoops up the throw from home plate."
Date:
August 2, 1994
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0410B.0434]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "The towers, from left, are for Norman, Nichols Hills, Yukon (of course) and one now under construction in Mustang."
Date:
August 2, 1993
Creator:
Southerland, Paul B.
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
[Photograph 2012.201.B0314B.0160]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Charles Jones, City, Children's Television Producer"
Date:
August 2, 1998
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0410B.0433]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
August 2, 1993
Creator:
Southerland, Paul B.
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0408B.0060]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
August 2, 1994
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Press release: Task force statement on Judge Souter's nomination to Supreme Court]
Press release voicing concern from the NGLTF on Supreme Court nominee Judge Souter's commitment to protecting civil rights of gay men and lesbians. Includes a Congressional record of the House of the 101st Congress with handwritten notes/
Date:
August 2, 1990
Creator:
National Gay and Lesbian Task Force (U.S.)
Object Type:
Text
System:
The UNT Digital Library
[Press release: Task force represented at international gay conference]
Press release reporting on the NGLTF's representation at the international gay and lesbian conference.
Date:
August 2, 1990
Creator:
National Gay and Lesbian Task Force (U.S.)
Object Type:
Text
System:
The UNT Digital Library
The Canadian Record (Canadian, Tex.), Vol. 100, No. 31, Ed. 1 Thursday, August 2, 1990
Weekly newspaper from Canadian, Texas that includes local, state and national news along with extensive advertising.
Date:
August 2, 1990
Creator:
Ezzell, Ben & Ezzell, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
[Austin & Northwestern RR H.D.]
Photograph of the Austin & Northwestern RR H.D. in Burnet County, Texas.
Date:
August 2, 1993
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
Cherokeean/Herald (Rusk, Tex.), Vol. 142, No. 26, Ed. 1 Thursday, August 2, 1990
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
August 2, 1990
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History