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in subjects: "Buildup"

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Gas Leak from Vinyl Taped Stainless Steel Dressing Jars

The leak rates of nitrogen gas from stainless steel dressing jars taped with 2 inch vinyl tape were measured. These results were used to calculate hydrogen leak rates from the same jars. The calculations show that the maximum concentration of hydrogen buildup in this type of container configuration will beat least 3 orders of magnitude below the lower explosion limit for hydrogen in air.

Date: March 1, 1999

Creator: Hayes, Tim

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

CO2 Hydrate Process for Gas Separation, Quarterly Report: July - September 2003

Modifications were implemented to the hydrogen flow test rig per safety review comments, and the apparatus was tested for leaks. Tests were then done using Helium/CO{sub 2} mixtures to re-verify performance prior to hydrogen testing. It was discovered that hydrate formation was more difficult to initiate, and new initiation methods were developed to improve the tests. Delivery of ETM hardware continued and buildup of the ETM system continued, the ETM is now mechanically complete. The STU (pilot… more

Date: January 1, 2004

Creator: Deppe, G.; Currier, R. & Spencer, D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Removal of NOx from diesel generator exhaust by pulsed electron beams

The objective of this paper is to determine the effects of electron beam pulse parameters on the utilization of the reactive free radicals for removal of NO{sub x} from diesel generator exhaust. A dose per pulse less than 1 kGy has been determined to be optimum for effective radical utilization. During each post-pulse period, the radicals are utilized in the removal of NO{sub x} in a timescale of around 100 microseconds; thus, with pulse frequencies of around 10 kHz or less, the radical concent… more

Date: July 3, 1997

Creator: Penetrante, B. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Sensitivity study of CO2 storage capacity in brine aquifers withclosed boundaries: Dependence on hydrogeologic properties

In large-scale geologic storage projects, the injected volumes of CO{sub 2} will displace huge volumes of native brine. If the designated storage formation is a closed system, e.g., a geologic unit that is compartmentalized by (almost) impermeable sealing units and/or sealing faults, the native brine cannot (easily) escape from the target reservoir. Thus the amount of supercritical CO{sub 2} that can be stored in such a system depends ultimately on how much pore space can be made available for … more

Date: February 7, 2007

Creator: Zhou, Q.; Birkholzer, J.; Rutqvist, J. & Tsang, C-F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Stability Issues of the Mu2e Proton Beam

Stability issues of the mu2e proton beam are discussed. These include space-charge distortion of bunch shape, microwave instabilities, mode-coupling instabilities, head-tail instabilities, as well as electron-cloud effects. We have studied several beam stability issues of the proton beam heading to the target for the mu2e experiment. We find bunch-shape distortions driven by the space charge force is reasonably small, and longitudinal microwave instability will unlikely to occur. Electron-cloud… more

Date: May 1, 2009

Creator: Ng, King-Yuen

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Visualization of a changing dose field.

To help visualize the results of dose modeling for nuclear materials processing opcrations, we have developed an integrated model that uses a simple dosc calculation tool to obtain estimates of the dose field in a complex geomctry and then post-process the data to produce a video of the now time-dependent data. We generate two-dimensional radiation fields within an existing physical cnvironment and then analyze them using three-dimensional visualization techniques. The radiation fields are gene… more

Date: January 1, 2002

Creator: Helm, T. M (Terry M.) & Kornreich, D. E. (Drew E.)

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Development of Pulse Position Modulation/Optical CDMA (PPM/O-CDMA) for Gb/s Fiber Optic Networking

Pulse position modulation (PPM) in lasercom systems is known to provide potential advantages over other modulation schemes. [1]. In PPM, a periodic time frame is established and data is transmitted by placing a pulse in any one of several subintervals (or ''slots'') within each frame. In PPM/O-CDMA all users use the same frame structure and each transmits its unique address code in place of the PPM pulse. The advantage of PPM as a pulsed signal format is that (1) a single pulse can transmit mul… more

Date: May 25, 2006

Creator: Mendez, A. J.; Hernandez, V. J.; Gagliardi, R. M.; Bennett, C. V. & Lennon, W. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The Search for Reconnection and Helicity During Formation of a Bounded Spheromak

Recent results from investigations using insertable magnetic probes at the Sustained Spheromak Physics Experiment (SSPX) [E. B. Hooper et al., Nucl. Fusion 39, 863 (1999)] are presented. Experiments were carried out during pre-programmed, constant amplitude coaxial gun current pulses, where magnetic field increases stepwise with every pulse, but eventually saturates. Magnetic traces from the probe, which is electrically isolated from the plasma and spans the flux conserver radius, indicate ther… more

Date: April 30, 2007

Creator: Romero-Talamas, C. A.; McLean, H. S.; Hooper, E. B.; Wood, R. D.; LoDestro, L. L. & Moller, J. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Antiproton Accumulator in the Main Injector era (2)

By adding a single quadrupole per sextant in the Antiproton Accumulator it is possible to obtain a lattice well suited for higher bandwidth stochastic cooling systems such as those anticipated for the Main Injector era. The lattice proposed here has excellent properties concerning both the lattice functions and the stochastic cooling parameters.

Date: December 1992

Creator: Visnjic, Vladimir

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Basin-Scale Hydrologic Impacts of CO2 Storage: Regulatory and Capacity Implications

Industrial-scale injection of CO{sub 2} into saline sedimentary basins will cause large-scale fluid pressurization and migration of native brines, which may affect valuable groundwater resources overlying the deep sequestration reservoirs. In this paper, we discuss how such basin-scale hydrologic impacts can (1) affect regulation of CO{sub 2} storage projects and (2) may reduce current storage capacity estimates. Our assessment arises from a hypothetical future carbon sequestration scenario in … more

Date: April 2, 2009

Creator: Birkholzer, J.T. & Zhou, Q.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Shock Initiation of UF-TATB at 250(degree)C

The shock initiation properties of pure ultrafine grade triaminotrinitrobenzne (UF-TATB) pressed to an initial density of 1.80 g/cm{sup 3} and fired at ambient temperature and 250 C are reported. Embedded manganin pressure gauges are used to measure the pressure histories during the buildup to detonation at several input pressures. The ambient temperature results confirm previous run distance to detonation versus shock pressure results. UF-TATB at 250 C is shown to be much more shock sensitive … more

Date: June 5, 2001

Creator: Urtiew, P A; Forbes, J W; Garcia, F & Tarver, C M

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Pressure drawdown analysis for the Travale 22 well

This work presents preliminary results on the analysis of drawdown data for Travale 22. Both wellhead pressure and flow rate data were recorded in this well for over a period of almost two years. In the past, Barelli et al. (1975) and Atkinson et al. (1977) presented the analysis of five pressure buildup tests. Figure 1 shows the Horner plot for these cases. They found that to have a good match in all cases, it was necessary to assume that the Travale 22 well is intersected by a partially penet… more

Date: January 1, 1978

Creator: Barelli, A.; Brigham, W.E.; Cinco, H.; Economides, M.; Miller, F.G.; Ramey, H.J., Jr. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Research project on CO2 geological storage and groundwaterresources: Large-scale hydrological evaluation and modeling of impact ongroundwater systems

If carbon dioxide capture and storage (CCS) technologies areimplemented on a large scale, the amounts of CO2 injected and sequesteredunderground could be extremely large. The stored CO2 then replaces largevolumes of native brine, which can cause considerable pressureperturbation and brine migration in the deep saline formations. Ifhydraulically communicating, either directly via updipping formations orthrough interlayer pathways such as faults or imperfect seals, theseperturbations may impact s… more

Date: October 24, 2007

Creator: Birkholzer, Jens; Zhou, Quanlin; Rutqvist, Jonny; Jordan, Preston; Zhang, K. & Tsang, Chin-Fu

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Electron cloud and space charge effects in the Fermilab Booster

The stable region of the Fermilab Booster beam in the complex coherent-tune-shift plane appears to have been shifted far away from the origin by its intense space charge making Landau damping appear impossible. Simulations reveal a substantial buildup of electron cloud in the whole Booster ramping cycle, both inside the unshielded combined-function magnets and the beam pipes joining the magnets, whenever the secondary-emission yield (SEY) is larger than {approx}1.6. The implication of the elect… more

Date: June 1, 2007

Creator: Ng, K. Y.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Preliminary estimates of dose and residual activation of selected components in ring collimation straight of the SNS

The highest doses to components in the SNS ring are expected to be to those located in the collimation straight section. In this paper the authors present estimated doses to magnets and cable located between collimators. In addition the buildup of relatively long half-life radioactive isotopes is estimated, following machine operation and shutdown. Finally, the potential dose to operators approaching the machine following operation and shutdown for four hours is made. The results indicate that … more

Date: June 30, 2000

Creator: Ludewig, H.; Catalan-Lasheras, N.; Simos, N.; Walker, J.; Mallen, A.; Wei, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Large-scale impact of CO2 storage in deep saline aquifers: A sensitivity study on pressure response in stratified systems

Large volumes of CO{sub 2} captured from carbon emitters (such as coal-fired power plants) may be stored in deep saline aquifers as a means of mitigating climate change. Storing these additional fluids may cause pressure changes and displacement of native brines, affecting subsurface volumes that can be significantly larger than the CO{sub 2} plume itself. This study aimed at determining the three-dimensional region of influence during/after injection of CO{sub 2} and evaluating the possible im… more

Date: November 1, 2008

Creator: Birkholzer, J.T.; Zhou, Q. & Tsang, C.-F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Numerical investigation for the impact of CO2 geologic sequestration on regional groundwater flow

Large-scale storage of carbon dioxide in saline aquifers may cause considerable pressure perturbation and brine migration in deep rock formations, which may have a significant influence on the regional groundwater system. With the help of parallel computing techniques, we conducted a comprehensive, large-scale numerical simulation of CO{sub 2} geologic storage that predicts not only CO{sub 2} migration, but also its impact on regional groundwater flow. As a case study, a hypothetical industrial… more

Date: April 15, 2009

Creator: Yamamoto, H.; Zhang, K.; Karasaki, K.; Marui, A.; Uehara, H. & Nishikawa, N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Recent developments in well test analysis in the Stanford Geothermal Program

In the past year a number of studies pertaining to geothermal well test analysis were conducted. In this paper a brief overview of progress on the following six subjects is presented: (1) earth tide effects on a closed reservoir, (2) transient pressure analysis of multilayered heterogeneous reservoirs, (3) interference testing with wellbore storage and skin at the producing well, (4) steam/water relative permeabilities, (5) transient rate and pressure buildup resulting from constant pressure pr… more

Date: January 1, 1978

Creator: Ehlig-Economides, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Synthesis, characterization and application of water-soluble and easily removable cationic pressure-sensitive adhesives. Quarterly technical report

The Institute studied the adsorption of cationic pressure-sensitive adhesive (PSA) on wood fiber, and the buildup of PSA in a closed water system during paper recycling; the results are presented. Georgia Tech worked to develop an environmentally friendly polymerization process to synthesize a novel re-dispersible PSA by co-polymerizing an oil-soluble monomer (butyl acrylate) and a cationic monomer MAEPTAC; results are presented. At the University of Georgia at Athens the project focused on the… more

Date: September 30, 1999

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Measurements and Phenomenological Modeling of Magnetic FluxBuildup in Spheromak Plasmas

Internal magnetic field measurements and high-speed imaging at the Sustained Spheromak Physics Experiment (SSPX) [E. B. Hooper, L. D. Pearlstein, R. H. Bulmer, Nucl. Fusion 39, 863 (1999)] are used to study spheromak formation and field buildup. The measurements are analyzed in the context of a phenomenological model of magnetic helicity based on the topological constraint of minimum helicity in the open flux before reconnecting and linking closed flux. Two stages are analyzed: (1) the initial … more

Date: December 14, 2007

Creator: Romero-Talamas, C. A.; Hooper, E. B.; Jayakumar, R.; McLean, H. S.; Wood, R. D. & Moller, J. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Response of oceanic hydrate-bearing sediments to thermalstresses

In this study, we evaluate the response of oceanicsubsurface systems to thermal stresses caused by the flow of warm fluidsthrough noninsulated well systems crossing hydrate-bearing sediments.Heat transport from warm fluids, originating from deeper reservoirs underproduction, into the geologic media can cause dissociation of the gashydrates. The objective of this study is to determine whether gasevolution from hydrate dissociation can lead to excessive pressurebuildup, and possibly to fracturing… more

Date: May 1, 2006

Creator: Moridis, G.J. & Kowalsky, M.B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Using a Borated Panel to Form a Dual Neutron-Gamma Detector

A borated polyethylene plane placed between a neutron source and a gamma spectrometer is used to form a dual neutron-gamma detection system. The polyethylene thermalizes the source neutrons so that they are captured by {sup 10}B to produce a flux of 478 keV gamma-rays that radiate from the plane. This results in a buildup of count rate in the detector over that from a disk of the same diameter as the detector crystal (same thickness as the panel). Radiation portal systems are a potential applic… more

Date: June 20, 2008

Creator: Wilde, Scott & Keegan, Raymond

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Direct Numerical Modeling of E-Cloud Driven Instability of a Bunch Train in the CERN SPS

The simulation package WARP-POSINST was recently upgraded for handling multiple bunches and modeling concurrently the electron cloud buildup and its effect on the beam, allowing for direct self-consistent simulation of bunch trains generating, and interacting with, electron clouds. We have used the WARP-POSINST package on massively parallel supercomputers to study the buildup and interaction of electron clouds with a proton bunch train in the CERN SPS accelerator. Results suggest that a positiv… more

Date: March 1, 2011

Creator: Vay, J. L.; Furman, M. A. & Venturini, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Agitation within Mk-42 insert caused by air sparge

Dissolution of Rocky Flats Pu alloys and Pu metal using a ``nested insert`` configuration (One Well Insert (S-3352) inside the Mk-42 Insert) will require a Nuclear Safety Study, a major assumption of which will be that the annular dissolver is well-mixed. The ``well-mixed`` assumption was theoretically and experimentally supported for alloy dissolution using the Three Well Insert, but the present situation differs significantly. In the former case, the insert was directly exposed to the agitati… more

Date: July 12, 1991

Creator: Ramsey, C. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department