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Failure Prevention by Short Time Corrosion Tests
Short time corrosion testing of perforated sheets and wire meshes fabricated from Type 304L stainless steel, Alloy 600 and C276 showed that 304L stainless steel perforated sheet should perform well as the material of construction for dissolver baskets. The baskets will be exposed to hot nitric acid solutions and are limited life components. The corrosion rates of the other alloys and of wire meshes were too high for useful extended service. Test results also indicated that corrosion of the dissolver should drop quickly during the dissolutions due to the inhibiting effects of the corrosion products produced by the dissolution processes.
Date:
May 1, 2005
Creator:
MICKALONIS, JOHN
Object Type:
Article
System:
The UNT Digital Library
FCC Record, Volume 20, No. 11, Pages 8760 to 9535, May 2 - May 20, 2005
Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date:
May 2005
Creator:
United States. Federal Communications Commission.
Object Type:
Book
System:
The UNT Digital Library
FEASIBILITY OF MEASURING IRON IN VIVO USING FAST 14 MEV NEUTRONS.
In this short report, I reassess the feasibility of measuring iron in vivo in the liver and heart of thalassemia patients undergoing chelation therapy. Despite the multiplicity of analytical methods for analyzing iron, only two, magnetic resonance imaging, and magnetic susceptibility, are suitable for in vivo applications, and these are limited to the liver because of the heart's beat. Previously, a nuclear method, gamma-resonance scattering, offered a quantitative measure of iron in these organs; however, it was abandoned because it necessitated a nuclear reactor to produce the radioactive source. I reviewed and reassessed the status of two alternative nuclear methods, based on iron spectroscopy of gamma rays induced by fast neutron inelastic scattering and delayed activation in iron. Both are quantitative methods with high specificity for iron and adequate penetrating power to measure it in organs sited deep within the human body. My experiments demonstrated that both modalities met the stated qualitative objectives to measure iron. However, neutron dosimetry revealed that the intensity of the neutron radiation field was too weak to reliably assess the minimum detection limits, and to allow quantitative extrapolations to measurements in people. A review of the literature, included in this report, showed that these findings …
Date:
May 1, 2005
Creator:
WIELOPOLSKI, L.
Object Type:
Report
System:
The UNT Digital Library
Feasibility study of beam-beam compensation in the Tevatron with wires
We explore the possibility of compensating long-range beam-beam interactions in the Tevatron by current carrying wires. Compensation strategies depend on whether the compensation is done close to the interaction or nonlocally, on the aspect ratio of the strong beam and on other details. Strategies for each case have been developed and applied to the Tevatron. We discuss the results of these strategies at injection and collision energy.
Date:
May 1, 2005
Creator:
Sen, Tanaji; /Fermilab; Erdelyi, Bela & U., /Northern Illinois
Object Type:
Article
System:
The UNT Digital Library
Fermentative Approaches to Hydrogen Production
A PowerPoint presentation given as part of the 2005 Hydrogen Program Review, May 23-26, 2005, in Washington, D.C.
Date:
May 1, 2005
Creator:
Maness, P. C.; Czernik, S. & Smolinski, S.
Object Type:
Presentation
System:
The UNT Digital Library
The Fermilab lattice information repository
Over the years, it has become increasingly obvious that a centralized lattice and machine information repository with the capability of keeping track of revision information could be of great value. This is especially true in the context of a large accelerator laboratory like Fermilab with six rings and sixteen beamlines operating in various modes and configurations, constantly subject to modifications, improvements and even major redesign. While there exist a handful of potentially suitable revision systems--both freely available and commercial--our experience has shown that expecting beam physicists to become fully conversant with complex revision system software used on an occasional basis is neither realistic nor practical. In this paper, we discuss technical aspects of the FNAL lattice repository, whose fully web-based interface hides the complexity of Subversion, a comprehensive open source revision system. The FNAL repository has been operational since September 2004; the unique architecture of ''Subversion'' has been a key ingredient of the technical success of its implementation.
Date:
May 1, 2005
Creator:
Ostiguy, J. F.; Michelotti, L.; McCusker-Whiting, M.; Kriss, M. & /Fermilab
Object Type:
Article
System:
The UNT Digital Library
Fermilab Recycler damper requirements and design
The design of transverse dampers for the Fermilab Recycler storage ring is described. An observed instability and analysis of subsequent measurements where used to identify the requirements. The digital approach being implemented is presented.
Date:
May 1, 2005
Creator:
Crisp, J.; Hu, M.; Tupikov, V. & /Fermilab
Object Type:
Article
System:
The UNT Digital Library
Fermilab silicon strip readout chip for BTev
A chip has been developed for reading out the silicon strip detectors in the new BTeV colliding beam experiment at Fermilab. The chip has been designed in a 0.25 {micro}m CMOS technology for high radiation tolerance. Numerous programmable features have been added to the chip, such as setup for operation at different beam crossing intervals. A full size chip has been fabricated and successfully tested. The design philosophy, circuit features, and test results are presented in this paper.
Date:
May 1, 2005
Creator:
Yarema, Raymond; Hoff, Jim; Mekkaoui, Abderrezak; Manghisoni, Massimo; Re, Valerio; Angeleri, Valentina et al.
Object Type:
Article
System:
The UNT Digital Library
Field quality study in Nb(3)Sn accelerator magnets
Four nearly identical Nb{sub 3}Sn dipole models of the same design were built and tested at Fermilab. It provided a unique opportunity of systematic study the field quality effects in Nb{sub 3}Sn accelerator magnets. The results of these studies are reported in the paper.
Date:
May 1, 2005
Creator:
Kashikhin, V. V.; Ambrosio, G.; Andreev, N.; Barzi, E.; Bossert, R.; DiMarco, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Filling in the Roadmap for Self-Consistent Electron Cloud and GasModeling
None
Date:
May 1, 2005
Creator:
Vay, Jean-Luc; Furman, Miguel A.; Seidl, P.A.; Cohen, Roland H.; Friedman, Alex; Grote, David P. et al.
Object Type:
Article
System:
The UNT Digital Library
Final Report for May 1 2004 to April 30 2005 and renewal request for the experiment # 1042511 Electro-optical detection for the temporal characterization of sub-picosecond beam bunch
To develop a novel, single-shot, non-destructive method of determining the time structure of the relativistic electron bunch length in the sub-picosecond resolution. Using an electro-optical flash (EO-flash) detection technique, we will demonstrate that the electron bunch length can be converted from time to spatial information. An additional task added for the continuation is advanced topics of particle acceleration in vacuum with high-power lasers.
Date:
May 1, 2005
Creator:
Ben-Zvi, Ilan
Object Type:
Report
System:
The UNT Digital Library
Final report on Weeks Island Monitoring Phase : 1999 through 2004.
This Final Report on the Monitoring Phase of the former Weeks Island Strategic Petroleum Reserve crude oil storage facility details the results of five years of monitoring of various surface accessible quantities at the decommissioned facility. The Weeks Island mine was authorized by the State of Louisiana as a Strategic Petroleum Reserve oil storage facility from 1979 until decommissioning of the facility in 1999. Discovery of a sinkhole over the facility in 1992 with freshwater inflow to the facility threatened the integrity of the oil storage and led to the decision to remove the oil, fill the chambers with brine, and decommission the facility. Thereafter, a monitoring phase, by agreement between the Department of Energy and the State, addressed facility stability and environmental concerns. Monitoring of the surface ground water and the brine of the underground chambers from the East Fill Hole produced no evidence of hydrocarbon contamination, which suggests that any unrecovered oil remaining in the underground chambers has been contained. Ever diminishing progression of the initial major sinkhole, and a subsequent minor sinkhole, with time was verification of the response of sinkholes to filling of the facility with brine. Brine filling of the facility ostensively eliminates any further …
Date:
May 1, 2005
Creator:
Ehgartner, Brian L. & Munson, Darrell Eugene
Object Type:
Report
System:
The UNT Digital Library
FIONDA (Filtering Images of Niobium Disks Application): Filter application for Eddy Current Scanner data analysis
As part of the material QC process, each Niobium disk from which a superconducting RF cavity is built must undergo an eddy current scan [1]. This process allows to discover embedded defects in the material that are not visible to the naked eye because too small or under the surface. Moreover, during the production process of SC cavities the outer layer of Nb is removed via chemical or electro-chemical etching, thus it is important to evaluate the quality of the subsurface layer (in the order of 100nm) where superconductivity will happen. The reference eddy current scanning machine is operated at DESY; at Fermilab we are using the SNS eddy current scanner on loan, courtesy of SNS. In the past year, several upgrades were implemented aiming at raising the SNS machine performance to that of the DESY reference machine [2]. As part of this effort an algorithm that enables the filtering of the results of the scans and thus improves the resolution of the process was developed. The description of the algorithm and of the software used to filter the scan results is presented in this note.
Date:
May 1, 2005
Creator:
Boffo, C. & Bauer, P.
Object Type:
Report
System:
The UNT Digital Library
First-principles simulation and comparison with beam tests for transverse instabilities and damper performance in the Fermilab Main Injector
An end-to-end performance calculation and comparison with beam tests was performed for the bunch-by-bunch digital transverse damper in the Fermilab Main Injector. Time dependent magnetic wakefields responsible for ''Resistive Wall'' transverse instabilities in the Main Injector were calculated with OPERA-2D using the actual beam pipe and dipole magnet lamination geometry. The leading order dipole component was parameterized and used as input to a bunch-by-bunch simulation which included the filling pattern and injection errors experienced in high-intensity operation of the Main Injector. The instability growth times, and the spreading of the disturbance due to newly misinjected batches was compared between simulations and beam data collected by the damper system. Further simulation models the effects of the damper system on the beam.
Date:
May 1, 2005
Creator:
Nicklaus, Dennis; Foster, G. William & Kashikhin, Vladimir
Object Type:
Article
System:
The UNT Digital Library
Fitting the fully coupled ORM for the Fermilab Booster
The orbit response matrix (ORM) method [1] is applied to model the Fermilab Booster with parameters such as the BPM gains and rolls, and parameters in the lattice model, including the gradient errors and magnets rolls. We found that the gradients and rolls of the adjacent combined-function magnets were deeply correlated, preventing full determination of the model parameters. Suitable constraints of the parameters were introduced to guarantee an unique, equivalent solution. Simulations show that such solution preserves proper combinations of the adjacent parameters. The result shows that the gradient errors of combined-function magnets are within design limits.
Date:
May 1, 2005
Creator:
Huang, X.; Lee, S. Y.; Prebys, Eric & Ankenbrandt, Charles
Object Type:
Article
System:
The UNT Digital Library
Fitting the luminosity decay in the Tevatron
This paper explores how to fit the decay of the luminosity in the Tevatron. The standard assumptions of a fixed-lifetime exponential decay are only appropriate for very short time intervals. A ''1/time'' functional form fits well, and is supported by analytical derivations. A more complex form, assuming a time-varying lifetime-like term, also produces good results. Changes in the luminosity can be factored into two phenomena: The luminosity burn-off rate, and the burn-off rate from non-luminosity effects. This is particularly relevant for the antiprotons in the Tevatron. The luminous and the non-luminous burn rate of the antiprotons are shown for Tevatron stores.
Date:
May 1, 2005
Creator:
McCrory, E.; Shiltsev, V.; Slaughter, A. J. & Xiao, A.
Object Type:
Article
System:
The UNT Digital Library
Ford Van Dyke: Compressed Air Management Program Leads to Improvements that Reduce Energy Consumption at an Automotive Transmission Plant
Staff at the Ford Van Dyke Transmission Plant in Sterling Heights, Michigan, have increased the efficiency of the plant's compressed air system to enhance its performance while saving energy and improving production. After plant staff identified opportunities for system improvements, a qualified instructor from a U.S. Department of Energy (DOE) Allied Partner, Scales Air Compressor Corporation, helped to clarify several of them. The resulting improvement measures are yielding energy savings for compressed air of more than 1 million kWh; energy and maintenance cost savings total $165,000. The total cost of planned upgrades and other measures was $336,000, for a 2-year simple payback.
Date:
May 1, 2005
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
FP-tree Based Spatial Co-location Pattern Mining
A co-location pattern is a set of spatial features frequently located together in space. A frequent pattern is a set of items that frequently appears in a transaction database. Since its introduction, the paradigm of frequent pattern mining has undergone a shift from candidate generation-and-test based approaches to projection based approaches. Co-location patterns resemble frequent patterns in many aspects. However, the lack of transaction concept, which is crucial in frequent pattern mining, makes the similar shift of paradigm in co-location pattern mining very difficult. This thesis investigates a projection based co-location pattern mining paradigm. In particular, a FP-tree based co-location mining framework and an algorithm called FP-CM, for FP-tree based co-location miner, are proposed. It is proved that FP-CM is complete, correct, and only requires a small constant number of database scans. The experimental results show that FP-CM outperforms candidate generation-and-test based co-location miner by an order of magnitude.
Date:
May 2005
Creator:
Yu, Ping
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
An FPGA-based quench detection and protection system for superconducting accelerator magnets
A new quench detection and protection system for superconducting accelerator magnets was developed for the Fermilab's Magnet Test Facility (MTF). This system is based on a Field-Programmable Gate Array (FPGA) module, and it is made of mostly commercially available, integrated hardware and software components. It provides all the functions of our existing VME-based quench detection and protection system, but in addition the new system is easily scalable to protect multiple magnets powered independently and a more powerful user interface and analysis tools. The new system has been used successfully for testing LHC Interaction Region Quadrupoles correctors and High Field Magnet HFDM04. In this paper we describe the system and present results.
Date:
May 1, 2005
Creator:
Carcagno, R. H.; Feher, S.; Lamm, M.; Makulski, A.; Nehring, R.; Orris, D. F. et al.
Object Type:
Article
System:
The UNT Digital Library
Fragmentation of quark and gluon jets in proton-antiproton collisions at center-of-mass energy of 1.8-TeV
The author reports the first model independent measurement of charged particle multiplicities in quark and gluon jets, N{sub q} and N{sub g}, produced at the Tevatron in p{bar p} collisions with center-of-mass energy 1.8 TeV and recorded by the Collider Detector at Fermilab. The measurements are made for jets with average energies 41 and 53 GeV by counting charged particle tracks in cones with opening angle of {theta}{sub c} = 0.28, 0.36, and 0.47 rad around the jet axis. The corresponding jet hardness Q = E{sub jet}{theta}{sub c} varies in the range from 12 GeV to 25 GeV. At Q = 19.2 GeV, the ratio of multiplicities r = N{sub g}/N{sub q} is found to be 1.64 {+-} 0.17, where statistical and systematic uncertainties are added in quadrature. The results are in agreement with re-summed perturbative QCD calculations and are consistent with recent e{sup +}e{sup -} measurements.
Date:
May 1, 2005
Creator:
Pronko, Alexandre P.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Fuel Cells Vehicle Systems Analysis (Fuel Cell Freeze Investigation)
Presentation on Fuel Cells Vehicle Systems Analysis (Fuel Cell Freeze Investigation) for the 2005 Hydrogen, Fuel Cells & Infrastructure Technologies Program Annual Review held in Arlington, Virginia on May 23-26, 2005.
Date:
May 1, 2005
Creator:
Pesaran, A.; Kim, G.; Markel, T. & Wipke, K.
Object Type:
Article
System:
The UNT Digital Library
Functional and Categorical Analysis of Waveshapes Recorded on Microelectrode Arrays
Dissociated neuronal cell cultures grown on substrate integrated microelectrode arrays (MEAs) generate spontaneous activity that can be recorded for up to several weeks. The signature wave shapes from extracellular recording of neuronal activity display a great variety of shapes with triphasic signals predominating. I characterized extracellular recordings from over 600 neuronal signals. I have preformed a categorical study by dividing wave shapes into two major classes: (type 1) signals in which the large positive peak follows the negative spike, and (type 2) signals in which the large positive peak precedes the negative spike. The former are hypothesized to be active signal propagation that can occur in the axon and possibly in soma or dendrites. The latter are hypothesized to be passive which is generally secluded to soma or dendrites. In order to verify these hypotheses, I pharmacologically targeted ion channels with tetrodotoxin (TTX), tetraethylammonium (TEA), 4-aminopyridine (4-AP), and monensin.
Date:
May 2005
Creator:
Schwartz, Jacob C.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Functionalization and characterization of porous low-κ dielectrics.
Access:
Use of this item is restricted to the UNT Community
The incorporation of fluorine into SiO2 has been shown to reduce the dielectric constant of the existing materials by reducing the electrical polarizability. However, the incorporation of fluorine has also been shown to decrease film stability. Therefore, new efforts have been made to find different ways to further decrease the relative dielectric constant value of the existing low-k materials. One way to reduce the dielectric constant is by decreasing its density. This reduces the amount of polarizable materials. A good approach is increasing porosity of the film. Recently, fluorinated silica xerogel films have been identified as potential candidates for applications such as interlayer dielectric materials in CMOS technology. In addition to their low dielectric constants, these films present properties such as low refractive indices, low thermal conductivities, and high surface areas. Another approach to lower k is incorporating lighter atoms such as hydrogen or carbon. Silsesquioxane based materials are among them. However, additional integration issues such as damage to these materials caused by plasma etch, plasma ash, and wet etch processes are yet to be overcome. This dissertation reports the effects of triethoxyfluorosilane-based (TEFS) xerogel films when reacted with silylation agents. TEFS films were employed because they form robust silica …
Date:
May 2005
Creator:
Orozco-Teran, Rosa Amelia
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Gasification Plant Cost and Performance Optimization
As part of an ongoing effort of the U.S. Department of Energy (DOE) to investigate the feasibility of gasification on a broader level, Nexant, Inc. was contracted to perform a comprehensive study to provide a set of gasification alternatives for consideration by the DOE. Nexant completed the first two tasks (Tasks 1 and 2) of the ''Gasification Plant Cost and Performance Optimization Study'' for the DOE's National Energy Technology Laboratory (NETL) in 2003. These tasks evaluated the use of the E-GAS{trademark} gasification technology (now owned by ConocoPhillips) for the production of power either alone or with polygeneration of industrial grade steam, fuel gas, hydrocarbon liquids, or hydrogen. NETL expanded this effort in Task 3 to evaluate Gas Technology Institute's (GTI) fluidized bed U-GAS{reg_sign} gasifier. The Task 3 study had three main objectives. The first was to examine the application of the gasifier at an industrial application in upstate New York using a Southeastern Ohio coal. The second was to investigate the GTI gasifier in a stand-alone lignite-fueled IGCC power plant application, sited in North Dakota. The final goal was to train NETL personnel in the methods of process design and systems analysis. These objectives were divided into five subtasks. Subtasks …
Date:
May 1, 2005
Creator:
Tam, Samuel; Nizamoff, Alan; Kramer, Sheldon; Olson, Scott; Lau, Francis; Roberts, Mike et al.
Object Type:
Report
System:
The UNT Digital Library