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26,401 Matching Results
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Experimental study of crossing angle collision
The non-linear coupling due to the beam-beam interaction with crossing angle has been studied. The major effect of a small ({approximately}12mrad) crossing angle is to excite 5Q{sub x}{plus_minus}Q{sub s}=integer coupling resonance family on large amplitude particles, which results in bad lifetime. On the CESR, a small crossing angle ({approximately}2.4mr) was created at the IP and a reasonable beam-beam tune-shift was achieved. The decay rate of the beam is measured as a function of horizontal tune with and without crossing angle. The theoretical analysis, simulation and experimental measurements have a good agreement. The resonance strength as a function of crossing angle is also measured.
Date:
May 1, 1993
Creator:
Chen, T.; Rice, D.; Rubin, D.; Sagan, D. & Tigner, M.
Object Type:
Article
System:
The UNT Digital Library
Parasitic crossing at an asymmetric B factory, APIARY
Effects of parasitic crossings ( near miss'' collisions of two counter-rotating beams at unwanted positions near the IP) are studied in terms of computer simulations for an asymmetric B Factory, APIARY- 6.3d. Beams are separated horizontally at the first parasitic crossing points by about 7.6 times the horizontal rms size of the low energy beam (the larger in size of the two beams), {sigma}{sub 0x,+}. Simulations, including both the beam collision at the IP and parasitic crossings, have been performed for different separation distances, d. It is found that the ratio d/{sigma}{sub 0x,+} is a good scaling parameter of beam blowup behavior. The results show that beam blowup due to the parasitic crossings is diminished for d {ge} 7{sigma}{sub 0x,+}, in agreement with the bunch separation experiment at CESR. Thus, the nominal separation 7.6 {sigma}{sub 0x,+} turns out to be acceptable, but with only a small margin. Some methods to mitigate the effects of the parasitic crossings are discussed. 3 refs. , 5 figs., 2 tabs.
Date:
May 1, 1991
Creator:
Chin, Y. H.
Object Type:
Article
System:
The UNT Digital Library
Design of Ilc Extraction Line for 20 Mrad Crossing Angle
One of the two ILC Interaction Regions will have a large horizontal crossing angle which would allow to extract the spent beams in a separate beam line. In this paper, the extraction line design for 20 mrad crossing angle is presented. This beam line transports the primary e{sup +}/e{sup -} and beamstrahlung photon beams from the IP to a common dump, and includes diagnostic section for energy and polarization measurements. The optics is designed for a large energy acceptance to minimize losses in the low energy tail of the disrupted beam. The extraction optics, diagnostic instrumentation and particle tracking simulations are described.
Date:
May 16, 2005
Creator:
Nosochkov, Y.; Moffeit, K.; Seryi, A.; Woods, M.; Arnold, R.; Oliver, W. et al.
Object Type:
Article
System:
The UNT Digital Library
Beam tilt due to e/sup +/e/sup /minus// crossing at an angle
The problem of beam tilt caused by beam-beam crossing at an angle has been treated by B. Richter and D. Ritson. An electron at a longitudinal position z relative to the center of the bunch experiences on the average a transverse kick proportional to z from the on-coming bunch. This kick produces a closed orbit for the electron being considered. The closed orbit is different for electrons with different values of z. Consequently, the beam will become tilted relative to its direction of motion. On the other hand, there is a longitudinal kick proportional to z of the particle due to both the rf focusing and the beams crossing at an angle. This longitudinal kick will cause the particle's energy to change and the energy change will, in turn, change the particle's z in the next revolution. It is, therefore, clear that a complete treatment of this problem should take the synchrotron oscillation, as well as the transverse betatron oscillation, into account. We will assume in a later calculation that the longitudinal defocusing effect due to beam-beam crossing at an angle is a dominated by the focusing effect provided by the rf cavities. The present note is to recalculate this …
Date:
May 1, 1978
Creator:
Chao, A. W. & Morton, P. L.
Object Type:
Report
System:
The UNT Digital Library
California-ko Ostatuak: a History of California's Basque Hotels
The history of California's Basque boardinghouses, or ostatuak, is the subject of this dissertation. To date, scholarly literature on ethnic boardinghouses is minimal and even less has been written on the Basque "hotels" of the American West. As a result, conclusions in this study rely upon interviews, census records, local directories, early maps, and newspapers. The first Basque boardinghouses in the United States appeared in California in the decade following the gold rush and tended to be outposts along travel routes used by Basque miners and sheepmen. As more Basques migrated to the United States, clusters of ostatuak sprang up in communities where Basque colonies had formed, particularly in Los Angeles and San Francisco during the late nineteenth century. In the years between 1890 and 1940, the ostatuak reached their zenith as Basques spread throughout the state and took their boardinghouses with them. This study outlines the earliest appearances of the Basque ostatuak, charts their expansion, and describes their present state of demise. The role of the ostatuak within Basque-American culture and a description of how they operated is another important aspect of this dissertation. Information from interviews supports the claim that the ostatua was the most important social institution …
Date:
May 1988
Creator:
Echeverría, Jerónima, 1946-
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
People Crossing Borders: An Analysis of U.S. Border Protection Policies
This report provides an overview of the current border protection framework and its operationally oriented strategic elements and measures their effectiveness. The report draws on documents from Congress and the Administration, as well as other publications, to pull together an overarching picture of protection at the border. This overview includes a historical background and a definition of what "border protection" means in a contemporary context. Building on this definition, the report provides two theoretical models for border protection approaches based on unilateral and cooperative approaches, followed by an extended analysis of the major elements within the current border protection framework. This analysis also includes discussions of how and why, certain strategic elements notwithstanding, many of the current border-related security policies focus on the physical border rather than conceptualizing the border in broader terms. Lastly, this report offers some policy options--both short-term and long-term--for addressing the effectiveness of current border protection policies.
Date:
May 13, 2010
Creator:
Haddal, Chad C.
Object Type:
Report
System:
The UNT Digital Library
Local Magnitude Tomography in California
None
Date:
May 24, 2010
Creator:
Ford, S R; Uhrhammer, R A & Hellweg, M
Object Type:
Article
System:
The UNT Digital Library
Neutron Production in the Pinch Due to Instability Breakup
Abstract: "The neutrons from the linear pinch in Berkeley have been shown to originate from deuteron collisions with a large net center-of-mass velocity in one direction along the axis of the pinch tube. The interpretation of this result is that the neutron production associated with the pinch is non-thermonuclear in origin. The object of this paper is to review the experimental evidence and discuss a possible source of the neutron production."
Date:
May 12, 1956
Creator:
Colgate, Stirling A.
Object Type:
Report
System:
The UNT Digital Library
Fourier Grain-Shape and Mineralogic Analyses of Coastal and Inner Shelf Sand Samples: Dana Point to the United-States-Mexico Border
From introduction: The principal purpose of this report is to determine the local sediment sources of beach sand samples from the Oceanside, Mission Beach, and Silver Strand littoral cells.
Date:
May 1989
Creator:
Osborne, Robert H.; Ahlschwede, Kelly S.; Broadhead, Sean D.; Cho, Kyung H.; Compton, Eleanor A. & Yeh, Chia-Chen
Object Type:
Report
System:
The UNT Digital Library
Site Environmental Report for 2012 Sandia National Laboratories California.
None
Date:
May 1, 2013
Creator:
Larsen, Barbara L.
Object Type:
Report
System:
The UNT Digital Library
Quaternary tectonics and basin history of Pahrump and Stewart Valleys, Nevada and California
The Pahrump fault system is an active fault system located in Pahrump and Stewart Valleys, Nevada and California, in the southern part of the Basin and Range Province. This system is 50 km long by 30 km wide and is comprised of three fault zones: the right-lateral East Nopah fault zone, the right-oblique Pahrump Valley fault zone, and the normal West Spring Mountains fault zone. All three zones have geomorphic evidence for late Quaternary activity. Analysis of active fault patterns and seismic reflection lines suggests that the Pahrump basin has had a two-stage genesis, an early history associated with a period of low angle detachment faulting probably active 10-15 Ma, and a more recent history related to the present dextral shear system, probably active post-4 Ma.
Date:
May 1, 1991
Creator:
Hoffard, Joanne L.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
[Roundtable Writer's Breakfast, Stereotypes: Series 3 of 3. Crossing the Line: African American Actors Portraying Stereotypical Roles in American, Theatre, Film and Television]
Video recording from The Black Academy of Arts and Letters recorded during their Roundtable Writer's Breakfast, Stereotypes: Series 3 of 3. Crossing the Line: African American Actors Portraying Stereotypical Roles in American, Theatre, Film and Television event in 2012. This video features discussions between prominent TBAAL members and actor Lou Myers about racial stereotypes in the arts.
Date:
May 5, 2012
Creator:
unknown
Object Type:
Video
System:
The UNT Digital Library
Tectonic Versus Volcanic Origin of the Summit Depression at Medicine Lake Volcano, California
Medicine Lake Volcano is a Quaternary shield volcano located in a tectonically complex and active zone at the transition between the Basin and Range Province and the Cascade Range of the Pacific Province. The volcano is topped by a 7x12 km elliptical depression surrounded by a discontinuous constructional ring of basaltic to rhyolitic lava flows. This thesis explores the possibility that the depression may have formed due to regional extension (rift basin) or dextral shear (pull-apart basin) rather than through caldera collapse and examines the relationship between regional tectonics and localized volcanism. Existing data consisting of temperature and magnetotelluric surveys, alteration mineral studies, and core logging were compiled and supplemented with additional core logging, field observations, and fault striae studies in paleomagnetically oriented core samples. These results were then synthesized with regional fault data from existing maps and databases. Faulting patterns near the caldera, extension directions derived from fault striae P and T axes, and three-dimensional temperature and alteration mineral models are consistent with slip across arcuate ring faults related to magma chamber deflation during flank eruptions and/or a pyroclastic eruption at about 180 ka. These results are not consistent with a rift or pull-apart basin. Limited subsidence can be …
Date:
May 1, 2010
Creator:
Gwynn, Mark Leon
Object Type:
Report
System:
The UNT Digital Library
Tectonic versus volcanic origin of the summit depression at Medicine Lake Volcano, California
Medicine Lake Volcano is a Quaternary shield volcano located in a tectonically complex and active zone at the transition between the Basin and Range Province and the Cascade Range of the Pacific Province. The volcano is topped by a 7x12 km elliptical depression surrounded by a discontinuous constructional ring of basaltic to rhyolitic lava flows. This thesis explores the possibility that the depression may have formed due to regional extension (rift basin) or dextral shear (pull-apart basin) rather than through caldera collapse and examines the relationship between regional tectonics and localized volcanism. Existing data consisting of temperature and magnetotelluric surveys, alteration mineral studies, and core logging were compiled and supplemented with additional core logging, field observations, and fault striae studies in paleomagnetically oriented core samples. These results were then synthesized with regional fault data from existing maps and databases. Faulting patterns near the caldera, extension directions derived from fault striae P and T axes, and three-dimensional temperature and alteration mineral models are consistent with slip across arcuate ring faults related to magma chamber deflation during flank eruptions and/or a pyroclastic eruption at about 180 ka. These results are not consistent with a rift or pull-apart basin. Limited subsidence can be …
Date:
May 1, 2010
Creator:
Gwynn, Mark Leon
Object Type:
Text
System:
The UNT Digital Library
Neotectonics of the southern Amargosa Desert, Nye County, Nevada and Inyo County, California
A complex pattern of active faults occurs in the southern Amargosa Desert, southern Nye, County, Nevada. These faults can be grouped into three main fault systems: (1) a NE-striking zone of faults that forms the southwest extension of the left-lateral Rock Valley fault zone, in the much larger Spotted Range-Mine Mountain structural zone, (2) a N-striking fault zone coinciding with a NNW-trending alignment of springs that is either a northward continuation of a fault along the west side of the Resting Spring Range or a N-striking branch fault of the Pahrump fault system, and (3) a NW-striking fault zone which is parallel to the Pahrump fault system, but is offset approximately 5 km with a left step in southern Ash Meadows. These three fault zones suggest extension is occurring in an E-W direction, which is compatible with the {approximately}N10W structural grain prevalent in the Death Valley extensional region to the west.
Date:
May 1, 1991
Creator:
Donovan, D.E.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Final report on the Groundwater Isotope Project in the Brentwood Region of East Contra Costa County, California
Groundwater in the Brentwood region has been characterized using isotope hydrology techniques and have addressed resource issues regarding the future sustainability of groundwater, maintenance of existing supplies, and exploration of new supplies. The stable isotopes of oxygen and hydrogen indicate that groundwater is derived from two sources: ancient rain recharge, and recharge of agricultural irrigation water. Rain derived groundwater ages range from <1000 to {approximately}12,000 years old. Agricultural recharge groundwater is <80 years and has recharged much of the basin on average to {approximately}125 fbs. The agricultural water recharges >10 times faster than natural rain water and hence, represents the principal recharge component. The agricultural recharge at the present time provides groundwater quantities to the basin that exceed the yearly water supply demand. With increasing urban development and retiring agricultural land, the availability of groundwater will decrease. Safe yield projections for the groundwater have been modeled to show that safe groundwater yields range between 30 to 120 acre-ft/mi{sup 2} per year for a population of 70,000 people. This will only account for {approximately}3 to 11 % of the total water demand. Furthermore, much of this groundwater may need well head treatment for water quality problems.
Date:
May 1, 1995
Creator:
Davisson, M. L. & Campbell, K. R.
Object Type:
Report
System:
The UNT Digital Library
Quaternary tectonics and basin history of Pahrump and Stewart Valleys, Nevada and California. [Yucca Mountain Project]
The Pahrump fault system is an active fault system located in Pahrump and Stewart Valleys, Nevada and California, in the southern part of the Basin and Range Province. This system is 50 km long by 30 km wide and is comprised of three fault zones: the right-lateral East Nopah fault zone, the right-oblique Pahrump Valley fault zone, and the normal West Spring Mountains fault zone. All three zones have geomorphic evidence for late Quaternary activity. Analysis of active fault patterns and seismic reflection lines suggests that the Pahrump basin has had a two-stage genesis, an early history associated with a period of low angle detachment faulting probably active 10-15 Ma, and a more recent history related to the present dextral shear system, probably active post-4 Ma.
Date:
May 1, 1991
Creator:
Hoffard, J.L. (Nevada Univ., Reno, NV (United States))
Object Type:
Report
System:
The UNT Digital Library
Proceedings of the Planetary Defense Workshop, Lawrence Livermore National Laboratory, California, May 22-26, 1995
None
Date:
May 1, 1995
Creator:
Nuckolls, J.
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
Geothermal direct heat use: market potential/penetration analysis for Federal Region IX (Arizona, California, Hawaii, Nevada)
A preliminary study was made of the potential for geothermal direct heat use in Arizona, California, Hawaii, and Nevada (Federal Region IX). The analysis for each state was performed by a different team, located in that state. For each state, the study team was asked to: (1) define the resource, based on the latest available data; (2) assess the potential market growth for geothermal energy; and (3) estimate the market penetration, projected to 2020. Each of the four states of interest in this study is unique in its own way. Rather than impose the same assumptions as to growth rates, capture rates, etc. on all of the study teams, each team was asked to use the most appropriate set of assumptions for its state. The results, therefore, should reflect the currently accepted views within each state. The four state reports comprise the main portion of this document. A brief regional overview section was prepared by the Jet Propulsion Laboratory, following completion of the state reports.
Date:
May 1, 1980
Creator:
Powell, W. & Tang, K. (eds.)
Object Type:
Report
System:
The UNT Digital Library
Increasing heavy oil reserves in the Wilmington oil field through advanced reservoir characterization and thermal production technologies. Technical progress report
The project involves improving thermal recovery techniques in a slope and basin clastic (SBC) reservoir in the Wilmington field, Los Angeles Co., California using advanced reservoir characterization and thermal production technologies. This is the third quarterly technical progress report for the project. Significant technical achievements accomplished include the drilling of four horizontal wells (two producers and two steam injectors) utilizing a new and lower cost drilling program, the drilling of five observation wells to monitor the horizontal steamflood pilot, the installation of a subsurface harbor channel crossing for delivering steam to an island location, and a geochemical study of the scale minerals being created in the wellbore. Cyclic steam injection into the two horizontal injection wells began in mid-December 1995 utilizing the new 2400 ft steam line under the Cerritos channel and the wells will be placed on production in May. Cyclic steam injection into the two horizontal producers will start in May. Work on the basic reservoir engineering is expected to be completed in March 1996. The deterministic geologic model was improved to add eight layers to the previous ten.
Date:
May 6, 1996
Creator:
Hara, S.
Object Type:
Report
System:
The UNT Digital Library
The Western Outlook (San Francisco and Oakland, Calif.), Vol. 34, No. 33, Ed. 1 Saturday, May 19, 1928
Weekly African-American newspaper published in Oakland, California that includes local, state and national news along with extensive advertising.
Date:
May 19, 1928
Creator:
Wysinger, J. E. & Derrick, J. Lincoln
Object Type:
Newspaper
System:
The Portal to Texas History
The Western Outlook. (San Francisco, Oakland and Los Angeles, Calif.), Vol. 21, No. 32, Ed. 1 Saturday, May 1, 1915
Weekly African-American newspaper published in Oakland, California that includes local, state and national news along with extensive advertising.
Date:
May 1, 1915
Creator:
Francis, Joseph S. & Derrick, J. Lincoln
Object Type:
Newspaper
System:
The Portal to Texas History
The Death Valley Expedition: A Biological Survey of Parts of California, Nevada, Arizona, and Utah, Part 2
Collection of reports on Death Valley, the bordering region of California, Nevada, Arizona, and Utah. Reports include birds, reptiles and Batrachians, fishes, insects, mollusks, trees and shrubs, cactuses and yuccas, and list of localities in the reports.
Date:
May 31, 1893
Creator:
Fisher, A. K.; Stejneger, Leonhard; Gilbert, Charles H.; Riley, C. V.; Stearns, R. E. C.; Merriam, C. Hart et al.
Object Type:
Report
System:
The UNT Digital Library