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Scaled Experimental Modeling of VHTR Plenum Flows
Abstract The Very High Temperature Reactor (VHTR) is the leading candidate for the Next Generation Nuclear Power (NGNP) Project in the U.S. which has the goal of demonstrating the production of emissions free electricity and hydrogen by 2015. Various scaled heated gas and water flow facilities were investigated for modeling VHTR upper and lower plenum flows during the decay heat portion of a pressurized conduction-cooldown scenario and for modeling thermal mixing and stratification (“thermal striping”) in the lower plenum during normal operation. It was concluded, based on phenomena scaling and instrumentation and other practical considerations, that a heated water flow scale model facility is preferable to a heated gas flow facility and to unheated facilities which use fluids with ranges of density to simulate the density effect of heating. For a heated water flow lower plenum model, both the Richardson numbers and Reynolds numbers may be approximately matched for conduction-cooldown natural circulation conditions. Thermal mixing during normal operation may be simulated but at lower, but still fully turbulent, Reynolds numbers than in the prototype. Natural circulation flows in the upper plenum may also be simulated in a separate heated water flow facility that uses the same plumbing as the lower …
Date:
April 1, 2007
Creator:
15, ICONE
Object Type:
Article
System:
The UNT Digital Library
Pressure-induced Breaking of Equilibrium Flux Surfaces in the W7AS Stellarator
Calculations are presented for two shots in the W7AS stellarator which differ only in the magnitude of the current in the divertor control coil, but have very different values of experimentally attainable β (<β> ≈ 2.7% versus <β> ≈ 1.8%). Equilibrium calculations find that a region of chaotic magnetic field line trajectories fills approximately the outer 1/3 of the cross-section in each of these configurations. The field lines in the stochastic region are calculated to behave as if the flux surfaces are broken only locally near the outer midplane and are preserved elsewhere. The calculated magnetic field line diffusion coefficients in the stochastic regions for the two shots are consistent with the observed differences in the attainable β, and are also consistent with the differences in the reconstructed pressure profiles.
Date:
April 24, 2007
Creator:
A. Reiman, M.C. Zarnstorff, D. Monticello, A. Weller, J. Geiger, and the W7-AS Team
Object Type:
Article
System:
The UNT Digital Library
Optical simulations of the ion beam emittance growth in different types of a gridded lens
N/A
Date:
April 1, 2007
Creator:
A., Pikin
Object Type:
Report
System:
The UNT Digital Library
FUTURE PLANS AT BNL: RHIC-II AND eRHIC.
The development of future facilities relevant to the study of deep inelastic scattering at BNL is described.
Date:
April 16, 2007
Creator:
ARONSON,S.
Object Type:
Article
System:
The UNT Digital Library
Measurement of the Lambda(b) lifetime in the exclusive decay Lambda(b) ---> J / psi Lambda
We have measured the {lambda}{sub b} lifetime using the exclusive decay {lambda}{sub b}{yields}J/{psi}{lambda}, based on 1.2 fb{sup -1} of data collected with the D0 detector during 2002-2006. From 171 reconstructed {lambda}{sub b} decays, where the J/{psi} and {lambda} are identified via the decays J/{psi}{yields}{mu}{sup +}{mu}{sup -} and {lambda}{yields}p{pi}, we measured the {lambda}{sub b} lifetime to be {tau}({lambda}{sub b})=1.218{sub -0.115}{sup +0.130}(stat){+-}0.042(syst) ps. We also measured the B{sup 0} lifetime in the decay B{sup 0}{yields}J/{psi}({mu}{sup +}{mu}{sup -})K{sub S}{sup 0}({pi}{sup +}{pi}{sup -}) to be {tau}(B{sup 0})=1.501{sub -0.074}{sup +0.078}(stat){+-}0.050(syst) ps, yielding a lifetime ratio of {tau}({lambda}{sub b})/{tau}(B{sup 0})=0.811{sub -0.087}{sup +0.096}(stat){+-}0.034(syst = )
Date:
April 1, 2007
Creator:
Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T. et al.
Object Type:
Article
System:
The UNT Digital Library
Search for a Higgs boson produced in association with a Z boson in p anti-p collisions
We describe a search for the standard model Higgs boson with a mass of 105 GeV/c{sup 2} to 145 GeV/c{sup 2} in data corresponding to an integrated luminosity of approximately 450 pb{sup -1} collected with the D0 detector at the Fermilab Tevatron p{bar p} collider at a center-of-mass energy of 1.96 TeV. The Higgs boson is required to be produced in association with a Z boson, and the Z boson is required to decay to either electrons or muons with the Higgs boson decaying to a b{bar b} pair. The data are well described by the expected background, leading to 95% confidence level cross section upper limits {sigma}p{bar p} {yields} ZH x B(H {yields} b{bar b}) in the range of 3.1 pb to 4.4 pb.
Date:
April 1, 2007
Creator:
Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T. et al.
Object Type:
Article
System:
The UNT Digital Library
Electric Transmission: Approaches for Energizing a Sagging Industry
This report discusses factors that have contributed to the lack of new transmission capacity and some of the resulting issues. This report reviews approaches being taken to address the lack of investment in transmission infrastructure and transmission congestion.
Date:
April 27, 2007
Creator:
Abel, Amy
Object Type:
Report
System:
The UNT Digital Library
2006 Electrochemistry Gordon Research Conference - February 12-17-2006
This report is a descriptive journey of 2006 Electrochemistry Gordon Research Conference.
Date:
April 3, 2007
Creator:
Abruna, Hector D.
Object Type:
Article
System:
The UNT Digital Library
Polarization of J / psi and psi(2S) mesons produced in p anti-p collisions at s**(1/2) = 1.96-TeV
The authors have measured the polarizations of J/{psi} and {psi}(2S) mesons as functions of their transverse momentum p{sub T} when they are produced promptly in the rapidity range |y| < 0.6 with p{sub T} {ge} 5 GeV/c. The analysis is performed using a data sample with an integrated luminosity of about 800 pb{sup -1} collected by the CDF II detector. For both vector mesons, they find that the polarizations become increasingly longitudinal as p{sub T} increases from 5 to 30 GeV/c. These results are compared to the predictions of non-relativistic quantum chromo-dynamics and other contemporary models. The polarizations of J/{psi} and {psi}(2S) mesons from B-hadron decays are also reported.
Date:
April 1, 2007
Creator:
Abulencia, A.; Adelman, J.; Affolder, T.; Akimoto, T.; Albrow, M. G.; Amerio, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Search for heavy, long-lived particles that decay to photons at CDF II
The authors present the first search for heavy, long-lived particles that decay to photons at a hadron collider. They use a sample of {gamma} + jet + missing transverse energy events in p{bar p} collisions at {radical}s = 1.96 TeV taken with the CDF II detector. Candidate events are selected based on the arrival time of the photon at the detector. Using an integrated luminosity of 570 pb{sup -1} of collision data, they observe 2 events, consistent with the background estimate of 1.3 {+-} 0.7 events. While the search strategy does not rely on model-specific dynamics, they set cross section limits in a supersymmetric model with {tilde {chi}}{sub 1}{sup 0} {yields} {gamma}{tilde G} and place the world-best 95% C.L. lower limit on the {tilde {chi}}{sub 1}{sup 0} mass of 101 GeV/c{sup 2} at {tau}{sub {tilde {chi}}{sub 1}{sup 0}} = 5 ns.
Date:
April 1, 2007
Creator:
Abulencia, A.; Adelman, J.; Affolder, T.; Akimoto, T.; Albrow, M. G.; Amerio, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Demonstration of Key Elements of a Dual Phase Argon Detection System Suitable for Measurement of Coherent Neutrino-Nucleus Scattering
This feasibility study sought to demonstrate several necessary steps in a research program whose ultimate goal is to detect coherent scattering of reactor antineutrinos in dual-phase noble liquid detectors. By constructing and operating a Argon gas-phase drift and scintillation test-bed, the study confirmed important expectations about sensitivity of these detectors, and thereby met the goals set forth in our original proposal. This work has resulted in a successful Lab-Wide LDRD for design and deployment of a coherent scatter detector at a nuclear reactor, and strong interest by DOE Office of Science. In recent years, researchers at LLNL and elsewhere have converged on a design approach for a new generation of very low noise, low background particle detectors known as two-phase noble liquid/noble gas ionization detectors. This versatile class of detector can be used to detect coherent neutrino scattering-an as yet unmeasured prediction of the Standard Model of particle physics. Using the dual phase technology, our group would be the first to verify the existence of this process. Its (non)detection would (refute)validate central tenets of the Standard Model. The existence of this process is also important in astrophysics, where coherent neutrino scattering is assumed to play an important role in energy …
Date:
April 16, 2007
Creator:
Adam, B.; Celeste, W.; Christian, H.; Wolfgang, S. & Norman, M.
Object Type:
Report
System:
The UNT Digital Library
USING WET AIR OXIDATION TECHNOLOGY TO DESTROY TETRAPHENYLBORATE
A bench-scale feasibility study on the use of a Wet Air Oxidation (WAO) process to destroy a slurry laden with tetraphenylborate (TPB) compounds has been undertaken. WAO is an aqueous phase process in which soluble and/or insoluble waste constituents are oxidized using oxygen or oxygen in air at elevated temperatures and pressures ranging from 150 C and 1 MPa to 320 C and 22 MPa. The products of the reaction are CO{sub 2}, H{sub 2}O, and low molecular weight oxygenated organics (e.g. acetate, oxalate). Test results indicate WAO is a feasible process for destroying TPB, its primary daughter products [triphenylborane (3PB), diphenylborinic acid (2PB), and phenylboronic acid (1PB)], phenol, and most of the biphenyl byproduct. The required conditions are a temperature of 300 C, a reaction time of 3 hours, 1:1 feed slurry dilution with 2M NaOH solution, the addition of CuSO{sub 4}.5H{sub 2}O solution (500 mg/L Cu) as catalyst, and the addition of 2000 mL/L of antifoam. However, for the destruction of TPB, its daughter compounds (3PB, 2PB, and 1PB), and phenol without consideration for biphenyl destruction, less severe conditions (280 C and 1-hour reaction time with similar remaining above conditions) are adequate.
Date:
April 4, 2007
Creator:
Adu-Wusu, K; Daniel McCabe, D & Bill Wilmarth, B
Object Type:
Article
System:
The UNT Digital Library
High Sensitivity Low Fluorescence Detection for Beryllium Particulates SBIR Phase I Final Report ER84587
Abstract: The technical objective in Phase I was to enhance the detection limit of beryllium using fluorescence system by a minimum factor of 10. This was to be achieved by modifying the chemistry and instrumentation. Both of these were completed independently. In each case we were able to lower the detection limit as desired. The objectives in Phase II are to adapt these changes for commercial activity (chemicals and instrument changes including automation).
Date:
April 17, 2007
Creator:
Agrawal, Anoop; Tonazzi, Juan Carlos Lopez & Cronin, John
Object Type:
Report
System:
The UNT Digital Library
A Search for electron neutrino appearance at the Delta m**2 ~ 1- eV**2 scale
The MiniBooNE Collaboration reports first results of a search for {upsilon}{sub e} appearance in a {upsilon}{sub {mu}} beam. With two largely independent analyses, we observe no significant excess of events above background for reconstructed neutrino energies above 475 MeV. The data are consistent with no oscillations within a two neutrino appearance-only oscillation model.
Date:
April 1, 2007
Creator:
Aguilar-Arevalo, A. A.; Bazarko, A. O.; Brice, S. J.; Brown, B. C.; Bugel, L.; Cao, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Smart Energy Management of Multiple Full Cell Powered Applications
In this research project the University of South Alabama research team has been investigating smart energy management and control of multiple fuel cell power sources when subjected to varying demands of electrical and thermal loads together with demands of hydrogen production. This research has focused on finding the optimal schedule of the multiple fuel cell power plants in terms of electric, thermal and hydrogen energy. The optimal schedule is expected to yield the lowest operating cost. Our team is also investigating the possibility of generating hydrogen using photoelectrochemical (PEC) solar cells through finding materials for efficient light harvesting photoanodes. The goal is to develop an efficient and cost effective PEC solar cell system for direct electrolysis of water. In addition, models for hydrogen production, purification, and storage will be developed. The results obtained and the data collected will be then used to develop a smart energy management algorithm whose function is to maximize energy conservation within a managed set of appliances, thereby lowering O/M costs of the Fuel Cell power plant (FCPP), and allowing more hydrogen generation opportunities. The Smart Energy Management and Control (SEMaC) software, developed earlier, controls electrical loads in an individual home to achieve load management objectives …
Date:
April 23, 2007
Creator:
Alam, MOhammad S.
Object Type:
Report
System:
The UNT Digital Library
Smart Energy Management of Multiple Full Cell Powered Applications
In this research project the University of South Alabama research team has been investigating smart energy management and control of multiple fuel cell power sources when subjected to varying demands of electrical and thermal loads together with demands of hydrogen production. This research has focused on finding the optimal schedule of the multiple fuel cell power plants in terms of electric, thermal and hydrogen energy. The optimal schedule is expected to yield the lowest operating cost. Our team is also investigating the possibility of generating hydrogen using photoelectrochemical (PEC) solar cells through finding materials for efficient light harvesting photoanodes. The goal is to develop an efficient and cost effective PEC solar cell system for direct electrolysis of water. In addition, models for hydrogen production, purification, and storage will be developed. The results obtained and the data collected will be then used to develop a smart energy management algorithm whose function is to maximize energy conservation within a managed set of appliances, thereby lowering O/M costs of the Fuel Cell power plant (FCPP), and allowing more hydrogen generation opportunities. The Smart Energy Management and Control (SEMaC) software, developed earlier, controls electrical loads in an individual home to achieve load management objectives …
Date:
April 23, 2007
Creator:
Alam, Mohammad S.
Object Type:
Report
System:
The UNT Digital Library
Senior Recital: 2007-04-24 - Lucas Frank Albano
Access:
Use of this item is restricted to the UNT Community
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Bachelor of Music (BM) degree.
Date:
April 24, 2007
Creator:
Albano, Lucas Frank
Object Type:
Sound
System:
The UNT Digital Library
Senior Recital: 2007-04-24 - Lucas Frank Albano, percussion
Access:
Use of this item is restricted to the UNT Community
A senior recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Bachelor of Music (BM) degree.
Date:
April 24, 2007
Creator:
Albano, Lucas Frank
Object Type:
Sound
System:
The UNT Digital Library
Oral History Interview with Joel D. Alderson, April 10, 2007
Transcript of an oral interview with Joel Alderson and his wife Nila. He discusses going to boot camp in Texas, shipping off to France in early 1945 and working as an engineer, constructing bridges and demolishing German fortifications for the Army as it made it's way through Germany, blowing up Hilter's bunker in Salzburg, Austria and using bulldozers to cover piles of dead Jews the Germans left in the open (likely at Dachau). He ancedotes about meeting Eisenhower, carrying fuel up to Patton's limo when it ran out of gas, seeing Bob Hope, soldiers getting poisoned from confiscated alcohol, and getting met by his family and the town sheriff when he came home after the war.
Date:
April 10, 2007
Creator:
Alderson, Joel D.
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Joel D. Alderson, April 10, 2007
Transcript of an oral interview with Joel Alderson and his wife Nila. He discusses going to boot camp in Texas, shipping off to France in early 1945 and working as an engineer, constructing bridges and demolishing German fortifications for the Army as it made it's way through Germany, blowing up Hilter's bunker in Salzburg, Austria and using bulldozers to cover piles of dead Jews the Germans left in the open (likely at Dachau). He ancedotes about meeting Eisenhower, carrying fuel up to Patton's limo when it ran out of gas, seeing Bob Hope, soldiers getting poisoned from confiscated alcohol, and getting met by his family and the town sheriff when he came home after the war.
Date:
April 10, 2007
Creator:
Alderson, Joel D.
Object Type:
Text
System:
The Portal to Texas History
Oral History Interview with Nila Jackson Alderson, April 23, 2007
Transcript of an oral interview with Nila Jackson Alderson. Born in 1925, Alderson describes life before and during the war in rural Texas as well as in the town of Burnet, Texas . Her husband, Joe Alderson, served in the military in Europe. They both discuss the mail service during the war. The interview includes information about her parents and siblings.
Date:
April 23, 2007
Creator:
Alderson, Nila Jackson
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Nila Jackson Alderson, April 23, 2007
Transcript of an oral interview with Nila Jackson Alderson. Born in 1925, Alderson describes life before and during the war in rural Texas as well as in the town of Burnet, Texas . Her husband, Joe Alderson, served in the military in Europe. They both discuss the mail service during the war. The interview includes information about her parents and siblings.
Date:
April 23, 2007
Creator:
Alderson, Nila Jackson
Object Type:
Text
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 24, No. 14, Ed. 1 Thursday, April 5, 2007
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
April 5, 2007
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 24, No. 15, Ed. 1 Thursday, April 12, 2007
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
April 12, 2007
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History