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469 Matching Results
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Heat Exchanger Temperature Response for Duty-Cycle Transients in the NGNP/HTE.
Control system studies were performed for the Next Generation Nuclear Plant (NGNP) interfaced to the High Temperature Electrolysis (HTE) plant. Temperature change and associated thermal stresses are important factors in determining plant lifetime. In the NGNP the design objective of a 40 year lifetime for the Intermediate Heat Exchanger (IHX) in particular is seen as a challenge. A control system was designed to minimize temperature changes in the IHX and more generally at all high-temperature locations in the plant for duty-cycle transients. In the NGNP this includes structures at the reactor outlet and at the inlet to the turbine. This problem was approached by identifying those high-level factors that determine temperature rates of change. First are the set of duty cycle transients over which the control engineer has little control but which none-the-less must be addressed. Second is the partitioning of the temperature response into a quasi-static component and a transient component. These two components are largely independent of each other and when addressed as such greater understanding of temperature change mechanisms and how to deal with them is achieved. Third is the manner in which energy and mass flow rates are managed. Generally one aims for a temperature distribution …
Date:
March 12, 2009
Creator:
Vilim, R. B.
Object Type:
Report
System:
The UNT Digital Library
Probing the quark-gluon plasma at the LHC with Z0-tagged jets in CMS
An important tool in quark-gluon plasma studies at RHIC has been the measurement of dijets investigated via leading hadron correlations. With much higher rates for hard processes at the Large Hadron Collider, studies of Z{sup 0}-tagged jets become possible. A clear experimental signature is provided by the measurement of muon pairs from the Z{sup 0} decays, for which CMS is an ideally suited detector. Instead of measuring back-to-back correlations of two strongly interacting particles, one side is replaced by an electromagnetic probe which propagates through the plasma undisturbed and provides a measurement of the energy of the initial hard scattering. We propose to use lepton-pair tagged jets to study medium-induced partonic energy loss and to measure in-medium parton fragmentation functions. The lepton pairs from semileptonic decays of heavy meson pairs (B{bar B} and D{bar D}) are a background source for the tagged dilepton-jet signal. We present the calculated signal rates (using PYTHIA) and background rates (using HVQMNR). We also discuss strategies for maximizing the signal-to-background ratio.
Date:
March 12, 2007
Creator:
Mironov, C; Castro, M; Constantin, P; Kunde, G J & Vogt, R
Object Type:
Article
System:
The UNT Digital Library
Simulations of the Electron Cloud Build Up and Instabilities for Various ILC Damping Ring Configurations
In the beam pipe of the positron damping ring of the International Linear Collider (ILC), an electron cloud may be first produced by photoelectrons and ionization of residual gases and then increased by the secondary emission process. This paper reports the assessment of electron cloud effects in a number of configuration options for the ILC baseline configuration. Careful estimates were made of the secondary electron yield (sometimes in the literature also referred as secondary emission yield SEY or {delta}, with a peak value {delta}{sub max}) threshold for electron cloud build-up, and the related single- and coupled-bunch instabilities, as a function of beam current and surface properties for a variety of optics designs. When the configuration for the ILC damping rings was chosen at the end of 2005, the results from these studies were important considerations. On the basis of the joint theoretical and experimental work, the baseline configuration currently specifies a pair of 6 km damping rings for the positron beam, to mitigate the effects of the electron cloud that could present difficulties in a single 6 km ring. However, since mitigation techniques are now estimated to be sufficiently mature, a reduced single 6-km circumference is presently under consideration so …
Date:
March 12, 2007
Creator:
Pivi, Mauro; Raubenheimer, Tor O.; Wang, Lanfa; Ohmi, Kazuhito & Wanzenberg, Rainer
Object Type:
Article
System:
The UNT Digital Library
Design and Fabrication of a Novel Cryogenic Laser-Driven Ignition Target
The targets used in the campaign to achieve fusion ignition at the National Ignition Facility (NIF), the world's largest laser, will be some of the most complex and precise ever built. Key to the success of the campaign is repeatable performance of the targets as components of each experiment. We have developed a target design that will achieve the necessary precision and manufacturability, and will also provide the necessary repeatability while retaining experimental flexibility.
Date:
March 12, 2007
Creator:
Lawrence Livermore National Laboratory
Object Type:
Article
System:
The UNT Digital Library
Smart Surfaces: New Coatings & Paints with Radiation Detection Functionality
Paints are being developed and tested that might ultimately be able to detect radiological agents in the environment by incorporating special pigments into an organic polymeric binder that can be applied as a paint or coatings. These paints detect radioactive sources and contaminants with inorganic or organic scintillation or thermo-luminescent pigments, which are selected based upon the radiation ({alpha}, {beta}, {gamma} or n) to be detected, and are shown in Figure 1.
Date:
March 12, 2007
Creator:
Farmer, J & Choi, J
Object Type:
Report
System:
The UNT Digital Library
The Wylie News (Wylie, Tex.), Vol. 55, No. 42, Ed. 1 Wednesday, March 12, 2003
Weekly newspaper from Wylie, Texas that includes local, state and national news along with advertising.
Date:
March 12, 2003
Creator:
Engbrock, Chad B.
Object Type:
Newspaper
System:
The Portal to Texas History
Rains County Leader (Emory, Tex.), Vol. 114, No. 39, Ed. 1 Tuesday, March 12, 2002
Weekly newspaper from Emory, Texas that includes local, state, and national news along with advertising.
Date:
March 12, 2002
Creator:
Hill, Earl Clyde, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 97, No. 44, Ed. 1 Sunday, March 12, 2006
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
March 12, 2006
Creator:
Wright, Dustin
Object Type:
Newspaper
System:
The Portal to Texas History
[Clipping: Divine Denim]
Newspaper article about the Design Industries Foundation Fighting AIDS charitable runway show.
Date:
March 12, 2004
Creator:
Kusner, Daniel A.
Object Type:
Clipping
System:
The UNT Digital Library
The Panola Watchman (Carthage, Tex.), Vol. 133, No. 21, Ed. 1 Sunday, March 12, 2006
Semiweekly newspaper from Carthage, Texas that includes local, state, and national news along with advertising.
Date:
March 12, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 124, No. 19, Ed. 1 Sunday, March 12, 2006
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
March 12, 2006
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 27, No. 10, Ed. 1 Thursday, March 12, 2009
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
March 12, 2009
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 11, Ed. 1 Wednesday, March 12, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
March 12, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 109, No. 20, Ed. 1 Friday, March 12, 2004
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
March 12, 2004
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 108, No. 21, Ed. 1 Wednesday, March 12, 2003
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
March 12, 2003
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 93, No. 42, Ed. 1 Sunday, March 12, 2000
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with advertising.
Date:
March 12, 2000
Creator:
Dow, M. Gene & Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 95, No. 43, Ed. 1 Wednesday, March 12, 2003
Semi-weekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
March 12, 2003
Creator:
Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
Cooper Review (Cooper, Tex.), Vol. 129, No. 11, Ed. 1 Thursday, March 12, 2009
Weekly newspaper from Cooper, Texas that includes local, state, and national news along with advertising.
Date:
March 12, 2009
Creator:
Palmer, Roger
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 118, No. 21, Ed. 1 Sunday, March 12, 2000
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
March 12, 2000
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 127, No. 21, Ed. 1 Thursday, March 12, 2009
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
March 12, 2009
Creator:
Reddell, Valerie
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County News (Archer City, Tex.), No. 11, Ed. 1 Thursday, March 12, 2009
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
March 12, 2009
Creator:
Lewis, Shelley
Object Type:
Newspaper
System:
The Portal to Texas History
Radionuclide Transport Models Under Ambient Conditions
The purpose of this Analysis/Model Report (AMR) is to evaluate (by means of 2-D semianalytical and 3-D numerical models) the transport of radioactive solutes and colloids in the unsaturated zone (UZ) under ambient conditions from the potential repository horizon to the water table at Yucca Mountain (YM), Nevada. This is in accordance with the ''AMR Development Plan U0060, Radionuclide Transport Models Under Ambient Conditions'' (CRWMS M and O 1999a). This AMR supports the UZ Flow and Transport Process Model Report (PMR). This AMR documents the UZ Radionuclide Transport Model (RTM). This model considers: the transport of radionuclides through fractured tuffs; the effects of changes in the intensity and configuration of fracturing from hydrogeologic unit to unit; colloid transport; physical and retardation processes and the effects of perched water. In this AMR they document the capabilities of the UZ RTM, which can describe flow (saturated and/or unsaturated) and transport, and accounts for (a) advection, (b) molecular diffusion, (c) hydrodynamic dispersion (with full 3-D tensorial representation), (d) kinetic or equilibrium physical and/or chemical sorption (linear, Langmuir, Freundlich or combined), (e) first-order linear chemical reaction, (f) radioactive decay and tracking of daughters, (g) colloid filtration (equilibrium, kinetic or combined), and (h) colloid-assisted solute …
Date:
March 12, 2000
Creator:
Moridis, G. & Hu, Q.
Object Type:
Report
System:
The UNT Digital Library
Aluminum Leaching of ''Archived'' Sludge from Tanks 8F, 11H, and 12H
Aluminum can promote formation or dissolution of networks in hydroxide solid solutions. When present in large amounts it will act as a network former increasing both the viscosity and the surface tension of melts. This translates into poor free flow properties that affect pour rate of glass production in the Defense Waste Processing Facility (DWPF). To mitigate this situation, DWPF operations limit the amount of aluminum contained in sludge. This study investigated the leaching of aluminum compounds from archived sludge samples. The conclusions found boehmite present as the predominant aluminum compound in sludge from two tanks. We did not identify an aluminum compound in sludge from the third tank. We did not detect any amorphous aluminum hydroxide in the samples. The amount of goethite measured 4.2 percentage weight while hematite measured 3.7 percentage weight in Tank 11H sludge. The recommended recipe for removing gibbsite in sludge proved inefficient for digesting boehmite, removing less than 50 per cent of the compound within 48 hours. The recipe did remove boehmite when the test ran for 10 days (i.e., 7 more days than the recommended baseline leaching period). Additions of fluoride and phosphate to Tank 12H archived sludge did not improve the aluminum …
Date:
March 12, 2004
Creator:
Fondeur, Fernando F.; Hobbs, D. T. & Fink, S. D.
Object Type:
Report
System:
The UNT Digital Library
Midwest Transmission Workshop III Summary
OAK-B135 On March 12-13, 2002, the National Wind Coordinating Committee (NWCC), in cooperation with regional stakeholders, held a two-day workshop: Planning for Electrical Transmission Needs in the Upper Midwest. The workshop was the outgrowth of an effort to develop a forum and process for consideration of transmission options that strives for equitable allocation of benefits and impacts among all affected parties. The goal of this workshop was to provide a catalyst for an enhanced, inclusive process for transmission planning with participation of and acceptance by all affected stakeholders. Participants in the meeting included representatives of state and regional regulatory agencies, utilities and power generators, the wind industry, environmental and landowner interests, and other interested parties (see Attachment A for a list of meeting participants).
Date:
March 12, 2003
Creator:
Bryan, Kevin
Object Type:
Report
System:
The UNT Digital Library