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9,751 Matching Results
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Vibroseis Monitoring of San Andreas Fault in California
A unique data set of seismograms for 720 source-receiver paths has been collected as part of a controlled source Vibroseis experiment San Andreas Fault (SAF) at Parkfield. In the experiment, seismic waves repeatedly illuminated the epicentral region of the expected M6 event at Parkfield from June 1987 until November 1996. For this effort, a large shear-wave vibrator was interfaced with the 3-component (3-C) borehole High-Resolution Seismic Network (HRSN), providing precisely timed collection of data for detailed studies of changes in wave propagation associated with stress and strain accumulation in the fault zone (FZ). Data collected by the borehole network were examined for evidence of changes associated with the nucleation process of the anticipated M6 earthquake at Parkfield. These investigations reported significant traveltime changes in the S coda for paths crossing the fault zone southeast of the epicenter and above the rupture zone of the 1966 M6 earthquake. Analysis and modeling of these data and comparison with observed changes in creep, water level, microseismicity, slip-at-depth and propagation from characteristic repeating microearthquakes showed temporal variations in a variety of wave propagation attributes that were synchronous with changes in deformation and local seismicity patterns. Numerical modeling suggests 200 meters as an effective thickness …
Date:
June 11, 2004
Creator:
Korneev, Valeri & Nadeau, Robert
Object Type:
Article
System:
The UNT Digital Library
Increasing heavy oil reservers in the Wilmington oil Field through advanced reservoir characterization and thermal production technologies, technical progress report, October 1, 1996--December 31, 1996
The project involves improving thermal recovery techniques in a slope and basin clastic (SBC) reservoir in the Wilmington field, Los Angeles Co., Calif. using advanced reservoir characterization and thermal production technologies. The existing steamflood in the Tar zone of Fault Block (FB) 11-A has been relatively inefficient because of several producibility problems which are common in SBC reservoirs. Inadequate characterization of the heterogeneous turbidite sands, high permeability thief zones, low gravity oil, and nonuniform distribution of remaining oil have all contributed to poor sweep efficiency, high steam-oil ratios, and early steam breakthrough. Operational problems related to steam breakthrough, high reservoir pressure, and unconsolidated formation sands have caused premature well and downhole equipment failures. In aggregate, these reservoir and operational constraints have resulted in increased operating costs and decreased recoverable reserves. The advanced technologies to be applied include: (1) Develop three-dimensional (3-D) deterministic and stochastic geologic models. (2) Develop 3-D deterministic and stochastic thermal reservoir simulation models to aid in reservoir management and subsequent development work. (3) Develop computerized 3-D visualizations of the geologic and reservoir simulation models to aid in analysis. (4) Perform detailed study on the geochemical interactions between the steam and the formation rock and fluids. (5) Pilot …
Date:
May 11, 1997
Creator:
Hara, S.
Object Type:
Report
System:
The UNT Digital Library
Results of a Biological Survey of the San Francisco Mountain Region and Desert of the Little Colorado, Arizona
Brief summary of a biological survey of the Painted Desert, specifically the San Francisco Mountain region, and the Grand Canyon (Cañon).
Date:
September 11, 1890
Creator:
Merriam, C. Hart & Stejneger, Leonhard
Object Type:
Report
System:
The UNT Digital Library
The Western Outlook. (San Francisco, Oakland and Los Angeles, Calif.), Vol. 22, No. 12, Ed. 1 Saturday, December 11, 1915
Weekly African-American newspaper published in Oakland, California that includes local, state and national news along with extensive advertising.
Date:
December 11, 1915
Creator:
Francis, Joseph S. & Derrick, J. Lincoln
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 36, No. 479, Ed. 1 Friday, November 11, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
November 11, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 40, No. 383, Ed. 1 Friday, September 11, 2009
Free weekly newspaper that includes business and classified advertising.
Date:
September 11, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 38, No. 167, Ed. 1 Friday, May 11, 2007
Free weekly newspaper that includes business and classified advertising.
Date:
May 11, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 37, No. 323, Ed. 1 Friday, August 11, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
August 11, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Ed. 1 Friday, February 11, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
February 11, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Simulating Time-Dependent Energy Transfer Between Crossed Laser Beams in an Expanding Plasma
A coupled mode system is derived to investigate a three-wave parametric instability leading to energy transfer between co-propagating laser beams crossing in a plasma flow. The model includes beams of finite width refracting in a prescribed transverse plasma flow with spatial and temporal gradients in velocity and density. The resulting paraxial light equations are discretized spatially with a Crank-Nicholson-type scheme, and these algebraic constraints are nonlinearly coupled with ordinary differential equations in time that describe the ion acoustic response. The entire nonlinear differential-algebraic system is solved using an adaptive, backward-differencing method coupled with Newton's method. A numerical study is conducted in two dimensions that compares the intensity gain of the fully time-dependent coupled mode system with the gain computed under the further assumption of a strongly-damped ion acoustic response. The results demonstrate a time-dependent gain suppression when the beam diameter is commensurate with the velocity gradient scale length. The gain suppression is shown to depend on time-dependent beam refraction and is interpreted as a time-dependent frequency shift.
Date:
October 11, 2004
Creator:
Hittinger, J. F.; Dorr, M. R.; Berger, R. L. & Williams, E. A.
Object Type:
Article
System:
The UNT Digital Library
A New Chicane Experiment in PEP-II to Test Mitigations of the Electron Cloud Effect for Linear Colliders
Beam instability caused by the electron cloud has been observed in positron and proton storage rings, and it is expected to be a limiting factor in the performance of future colliders [1-3]. The effect is expected to be particularly severe in magnetic field regions. To test possible mitigation methods in magnetic fields, we have installed a new 4-dipole chicane experiment in the PEP-II Low Energy Ring (LER) at SLAC with both bare and TiN-coated aluminum chambers. In particular, we have observed a large variation of the electron flux at the chamber wall as a function of the chicane dipole field. We infer this is a new high order resonance effect where the energy gained by the electrons in the positron beam depends on the phase of the electron cyclotron motion with respect to the bunch crossing, leading to a modulation of the secondary electron production. Presumably the cloud density is modulated as well and this resonance effect could be used to reduce its magnitude in future colliders. We present the experimental results obtained during January 2008 until the April final shut-down of the PEP-II machine.
Date:
June 11, 2008
Creator:
Pivi, M. T.; Pivi, M. T. F.; Ng, J. S. T.; Arnett, D.; Cooper, F.; Kharakh, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Oral History Interview with Norman Dike, May 11, 2001
Transcript of an oral inerview with Norman Dike. Born in Atlanta, Illinois, on April 18, 1923. Enlisted in the Navy on March 12, 1942 and was sent to Great Lakes, Illinois for recruit training. He was sent to Radioman School at the University of Idaho on May 25, 1942. Upon completion in August, as a Third Class Radioman, he was sent to Bainbridge Island, Washington to learn Japanese code. He recalls meeting Merry Miles, the second in command at SACO, at a party he gave for the SACO team at a Chinese restaurant. A short time later he volunteered for hazardous duty outside continental United States and was in Washington, DC where he met Captain Metzger who represented the Sino-American Cooperative Organization (SACO). Sent to San Pedro, California by train. He recounts his experiences on the train. Upon arrival in San Pedro he was embarked on the USS Hermitage (AP-54) a captured Italian liner converted into a troopship. He recalls some of his experiences on the Hermitage including the Crossing the Line ceremony where he became a Shellback. After arriving in Bombay, India he recounts the journey across India by rail and steamboat to a Himalayan airfield where he was …
Date:
May 11, 2001
Creator:
Dike, Norman
Object Type:
Text
System:
The Portal to Texas History
Oral History Interview with Norman Dike, May 11, 2001
Transcript of an oral inerview with Norman Dike. Born in Atlanta, Illinois, on April 18, 1923. Enlisted in the Navy on March 12, 1942 and was sent to Great Lakes, Illinois for recruit training. He was sent to Radioman School at the University of Idaho on May 25, 1942. Upon completion in August, as a Third Class Radioman, he was sent to Bainbridge Island, Washington to learn Japanese code. He recalls meeting Merry Miles, the second in command at SACO, at a party he gave for the SACO team at a Chinese restaurant. A short time later he volunteered for hazardous duty outside continental United States and was in Washington, DC where he met Captain Metzger who represented the Sino-American Cooperative Organization (SACO). Sent to San Pedro, California by train. He recounts his experiences on the train. Upon arrival in San Pedro he was embarked on the USS Hermitage (AP-54) a captured Italian liner converted into a troopship. He recalls some of his experiences on the Hermitage including the Crossing the Line ceremony where he became a Shellback. After arriving in Bombay, India he recounts the journey across India by rail and steamboat to a Himalayan airfield where he was …
Date:
May 11, 2001
Creator:
Dike, Norman
Object Type:
Sound
System:
The Portal to Texas History
The Garland News (Garland, Tex.), Vol. 54, No. 15, Ed. 1 Friday, July 11, 1941
Weekly newspaper from Garland, Texas that includes local, state, and national news along with advertising.
Date:
July 11, 1941
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Garland News. (Garland, Tex.), Vol. 19, No. 18, Ed. 1 Friday, August 11, 1905
Weekly newspaper from Garland, Texas that includes local, state, and national news along with advertising.
Date:
August 11, 1905
Creator:
Holford, Will A.
Object Type:
Newspaper
System:
The Portal to Texas History
The Garland News (Garland, Tex.), Vol. 55, No. 37, Ed. 1 Friday, December 11, 1942
Weekly newspaper from Garland, Texas that includes local, state, and national news along with advertising.
Date:
December 11, 1942
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Garland News. (Garland, Tex.), Vol. 17, No. 47, Ed. 1 Friday, March 11, 1904
Weekly newspaper from Garland, Texas that includes local, state, and national news along with advertising.
Date:
March 11, 1904
Creator:
Green, Joe T.
Object Type:
Newspaper
System:
The Portal to Texas History
Single Particle Difraction at FLASH
Single-pulse coherent diffraction patterns have been collected from randomly injected single particles with a soft X-ray free-electron laser (FEL). The intense focused FEL pulse gives a high-resolution low-noise coherent diffraction pattern of the object before that object turns into a plasma and explodes. A diffraction pattern of a single particle will only be recorded when the particle arrival into the FEL interaction region coincides with FEL pulse arrival and detector integration. The properties of the experimental apparatus coinciding with these three events set the data acquisition rate. For our single particle FLASH diffraction imaging experiments: (1) an aerodynamic lens stack prepared a particle beam that consisted of particles moving at 150-200 m/s positioned randomly in space and time, (2) the 10 fs long FEL pulses were delivered at a fixed rate, and (3) the detector was set to integrate and readout once every two seconds. The effect of these experimental parameters on the rate of data acquisition using randomly injected particles will be discussed. Overall, the ultrashort FEL pulses do not set the limit of the data acquisition, more important is the effective interaction time of the particle crossing the FEL focus, the pulse sequence structure and the detector readout …
Date:
June 11, 2010
Creator:
Bogan, M.; Boutet, S.; Starodub, Dmitri; Decorwin-Martin, Philippe; /SLAC; Chapman, H. et al.
Object Type:
Article
System:
The UNT Digital Library
Zeros in $pi$$pi$ scattering
None
Date:
April 11, 1973
Creator:
Pennington, M.R.
Object Type:
Article
System:
The UNT Digital Library
Interaction cross section of C/sub s//sup +/ ions
Some estimates of the shape of C/sub s/ ion and C/sub s/ atom interaction potentials suggest that the C/sup +//sub s/ + C/sup +//sub s/ charge transfer cross section may be less than 10/sup -15/ cm/sup 2/.
Date:
August 11, 1976
Creator:
Hiskes, J. R.
Object Type:
Report
System:
The UNT Digital Library
Status report to ERDA Nuclear Data Committee
This status report to the Nuclear Data Committee from LLL summarizes work in the areas of standards, nuclear data applications, nuclear data for safeguards, and nuclear data compilation. A few of these papers, though brief, do contain data. 9 figures, 2 tables. (RWR)
Date:
February 11, 1977
Creator:
Anderson, J. D.; Browne, J. C. & Gardner, D. G.
Object Type:
Report
System:
The UNT Digital Library
Signatures of the various regions of the outer magnetosphere in the pitch angle distributions of energetic particles
An account is given of the obervations of the pitch angle distributions of energetic particles in the near equatorial regions of the Earth's magnetosphere. The emphasis is on relating the observed distributions to the field configuration responsible for the observed effects. The observed effects relate to drift-shell splitting, to the breakdown of adiabatic guiding center motion in regions of sharp field curvature relative to partial gyro radii, to wave-particle interactions, and to moving field configurations. 39 references.
Date:
December 11, 1978
Creator:
West, H. I., Jr.
Object Type:
Article
System:
The UNT Digital Library
Progress in mirror machine research
The Mirror Fusion Program in the US is now focused on two concepts that can obtain high values of the power gain factor Q. These are the tandem mirror and field reversed mirror concepts. A new facility called TMX has been constructed to test the principles of the tandem mirror. A further attempt to create field reversal is being carried out in the 2XIIB facility (renamed Beta II) with neutral beam injection into a reversed-field target plasma to be created by a magnetized coaxial gun. During the next 5 years, the main mirror facilities in the US will be the TMX, Beta II, and a large mirror device called MFTF scheduled to operate by 1982. The program based on these facilities will be outlined and initial experimental results from TMX will be discussed.
Date:
September 11, 1979
Creator:
Fowler, T. K. & Coensgen, F. H.
Object Type:
Article
System:
The UNT Digital Library
A quasi-model-independent search for new high p{_}T physics at DO
We present a new quasi-model-independent strategy (''Sleuth'') for searching for physics beyond the standard model. We define final states to be studied, and construct a rule that identifies a set of relevant variables for any particular final state. A novel algorithm searches for regions of excess in those variables and quantifies the significance of any detected excess. This strategy is applied to search for new high p{_}T physics in approximately 100 pb{sup -1} of proton-anti-proton collisions at sqrt(s) = 1.8 TeV collected by the D0 experiment during 1992-1996 at the Fermilab Tevatron. We systematically analyze many exclusive final states, and demonstrate sensitivity to a variety of models predicting new phenomena at the electroweak scale. No evidence of new high p{_}T physics is observed.
Date:
December 11, 2000
Creator:
Knuteson, Bruce O.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library