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38
Implications of Pulser Voltage Ripple
In a recent set of measurements obtained by G. Kamin, W. Manning, A. Molvik, and J. Sullivan, the voltage waveform of the diode pulser had a ripple of approximately {+-}1.3% of the 65 kV flattop voltage, and the beam current had a larger corresponding ripple of approximately {+-}8.4% of the 1.5 mA average current at the location of the second Faraday cup, approximately 1.9 m downstream from the ion source. The period of the ripple was about 1 {mu}s. It was initially unclear whether this large current ripple was in fact a true measurement of the current or a spurious measurement of noise produced by the pulser electronics. The purpose of this note is to provide simulations which closely match the experimental results and thereby corroborate the physical nature of those measurements, and to provide predictions of the amplitude of the current ripples as they propagate to the end of linear transport section. Additionally analytic estimates are obtained which lend some insight into the nature of the current fluctuations and to provide an estimate of what the maximum amplitude of the current fluctuations are expected to be, and conversely what initial ripple in the voltage source is allowed, given a …
Date:
December 21, 2011
Creator:
Barnard, J J
Object Type:
Report
System:
The UNT Digital Library
Temporary Bridging Agents for use in Drilling and Completion of Enhanced Geothermal Systems
CSI Technologies, in conjunction with Alta Rock Energy and the University of Utah have undergone a study investigating materials and mechanisms with potential for use in Enhanced Geothermal Systems wells as temporary diverters or lost circulation materials. Studies were also conducted with regards to particle size distribution and sealing effectiveness using a lab-scale slot testing apparatus to simulate fractures. From the slot testing a numerical correlation was developed to determine the optimal PSD for a given fracture size. Field trials conducted using materials from this study were also successful.
Date:
December 21, 2011
Creator:
Watters, Larry; Watters, Jeff; Sutton, Joy; Combs, Kyle; Bour, Daniel; Petty, Susan et al.
Object Type:
Report
System:
The UNT Digital Library
The Lack of Torus Emission from BL Lacertae Objects: An Infrared View of Unification with WISE
This article uses data from the Wide-Field Infrared Survey Explorer to perform a statistical study on the mid-infrared properties of a large number of BL Lac objects.
Date:
December 21, 2011
Creator:
Plotkin, Richard M.; Anderson, Scott F.; Brandt, William Nielsen; Markoff, Sera; Shemmer, Ohad & Wu, Jianfeng
Object Type:
Article
System:
The UNT Digital Library
Jackson County Herald-Tribune (Edna, Tex.), Vol. 105, No. 5, Ed. 1 Wednesday, December 21, 2011
Weekly newspaper from Edna, Texas that includes local, state, and national news along with advertising.
Date:
December 21, 2011
Creator:
Lundstrom, Chris
Object Type:
Newspaper
System:
The Portal to Texas History
Long-Term Hydrologic Monitoring Program Sampling and Analysis Results for 2011
The U.S. Department of Energy (DOE) Office of Legacy Management conducted annual sampling at the Rio Blanco site for the LTHMP on May 16 and 17, 2011. The samples were shipped to the U.S. Environmental Protection Agency (EPA) Radiation&Indoor Environments National Laboratory in Las Vegas, Nevada, for analysis. All requested analyses were successfully completed, with the exception of the determination of tritium concentration by the enrichment method, because the laboratory no longer provides that service. Samples were analyzed for gamma-emitting radionuclides by high-resolution gamma spectrometry and tritium using the conventional method. Starting in 2012, DOE will retain a different laboratory that provides the enriched tritium analysis service.
Date:
December 21, 2011
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 91, No. 250, Ed. 1 Wednesday, December 21, 2011
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 21, 2011
Creator:
Gray, Janie
Object Type:
Newspaper
System:
The Portal to Texas History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 97, No. 70, Ed. 1 Wednesday, December 21, 2011
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 21, 2011
Creator:
Gibbs, Angenene
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Panola Watchman (Carthage, Tex.), Vol. 139, No. 102, Ed. 1 Wednesday, December 21, 2011
Semiweekly newspaper from Carthage, Texas that includes local, state, and national news along with advertising.
Date:
December 21, 2011
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Yoakum Herald-Times (Yoakum, Tex.), Vol. 119, No. 51, Ed. 1 Wednesday, December 21, 2011
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
December 21, 2011
Creator:
McCracken, Michael S.
Object Type:
Newspaper
System:
The Portal to Texas History
An inquiry into the uneven distribution of women’s HIV infection in rural Malawi
Article exploring elevated HIV levels in Malawi's Southern Region and the relationship between HIV levels, male circumcision, and marital histories.
Date:
December 21, 2011
Creator:
Poulin, Michelle
Object Type:
Article
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Wednesday, December 21, 2011
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 21, 2011
Creator:
DeSilver, Debi
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Mannford Eagle (Mannford, Okla.), Vol. 54, No. 28, Ed. 1 Wednesday, December 21, 2011
Weekly newspaper from Mannford, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 21, 2011
Creator:
Hughes, Dustin
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 112, No. 182, Ed. 1 Wednesday, December 21, 2011
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 21, 2011
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 119, No. 249, Ed. 1 Wednesday, December 21, 2011
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 21, 2011
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History