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Laboratory Evaluation of LED T8 Replacement Lamp Products
A report on a lab setting analysis involving LED lamps intended to directly replace T8 fluorescent lamps (4') showing light output, power, and economic comparisons with other fluorescent options.
Date:
May 23, 2011
Creator:
Richman, Eric E.; Kinzey, Bruce R. & Miller, Naomi J.
Object Type:
Report
System:
The UNT Digital Library
Hidden magnetic configuration in epitaxial La1-rSrzMnO3 films
We present an unreported magnetic configuration in epitaxial La{sub 1-x}Sr{sub x}MnO{sub 3} (x {approx} 0.3) (LSMO) films grown on strontium titanate (STO). X-ray magnetic circular dichroism indicates that the remanent magnetic state of thick LSMO films is opposite to the direction of applied magnetic field. Spectroscopic and scattering measurements reveal that the average Mn valence varies from mixed Mn{sup 3+}/Mn{sup 4+} to an enriched Mn{sup 3+} region near the STO interface, resulting in a compressive lattice along a, b-axis and a possible electronic reconstruction in the Mn e{sub g} orbital (d{sub 3z{sup 2}-r{sup 2}}). This reconstruction may provide a mechanism for coupling the Mn{sup 3+} moments antiferromagnetically along the surface normal direction, and in turn may lead to the observed reversed magnetic configuration.
Date:
May 23, 2011
Creator:
Kao, Chi-Chang
Object Type:
Article
System:
The UNT Digital Library
OECD MMCI 2-D Core Concrete Interaction (CCI) Tests : CCCI-1 Test Data Report-Thermalhydraulic Results. Rev 0 January 31, 2004.
The Melt Attack and Coolability Experiments (MACE) program addressed the issue of the ability of water to cool and thermally stabilize a molten core-concrete interaction when the reactants are flooded from above. These tests provided data regarding the nature of corium interactions with concrete, the heat transfer rates from the melt to the overlying water pool, and the role of noncondensable gases in the mixing processes that contribute to melt quenching. As a follow-on program to MACE, The Melt Coolability and Concrete Interaction Experiments (MCCI) project is conducting reactor material experiments and associated analysis to achieve the following objectives: (1) resolve the ex-vessel debris coolability issue through a program that focuses on providing both confirmatory evidence and test data for the coolability mechanisms identified in MACE integral effects tests, and (2) address remaining uncertainties related to long-term two-dimensional molten coreconcrete interactions under both wet and dry cavity conditions. Achievement of these two program objectives will demonstrate the efficacy of severe accident management guidelines for existing plants, and provide the technical basis for better containment designs for future plants. In terms of satisfying these objectives, the Management Board (MB) approved the conduct of two long-term 2-D Core-Concrete Interaction (CCI) experiments designed …
Date:
May 23, 2011
Creator:
Farmer, M. T.; Lomperski, S.; Aeschlimann, R. W. & Basu, S. (Nuclear Engineering Division)
Object Type:
Report
System:
The UNT Digital Library
Computational fluid dynamics analyses of lateral heat conduction, coolant azimuthal mixing and heat transfer predictions in a BR2 fuel assembly geometry.
To support the analyses related to the conversion of the BR2 core from highly-enriched (HEU) to low-enriched (LEU) fuel, the thermal-hydraulics codes PLTEMP and RELAP-3D are used to evaluate the safety margins during steady-state operation (PLTEMP), as well as after a loss-of-flow, loss-of-pressure, or a loss of coolant event (RELAP). In the 1-D PLTEMP and RELAP simulations, conduction in the azimuthal and axial directions is not accounted. The very good thermal conductivity of the cladding and the fuel meat and significant temperature gradients in the lateral directions (axial and azimuthal directions) could lead to a heat flux distribution that is significantly different than the power distribution. To evaluate the significance of the lateral heat conduction, 3-D computational fluid dynamics (CFD) simulations, using the CFD code STAR-CD, were performed. Safety margin calculations are typically performed for a hot stripe, i.e., an azimuthal region of the fuel plates/coolant channel containing the power peak. In a RELAP model, for example, a channel between two plates could be divided into a number of RELAP channels (stripes) in the azimuthal direction. In a PLTEMP model, the effect of azimuthal power peaking could be taken into account by using engineering factors. However, if the thermal mixing …
Date:
May 23, 2011
Creator:
Tzanos, C. P. & Dionne, B. (Nuclear Engineering Division)
Object Type:
Report
System:
The UNT Digital Library
Beam break-up estimates for the ERL at BNL
A prototype Ampere-class superconducting energy recovery linac (ERL) is under advanced construction at BNL. The ERL facility is comprised of a five-cell SC Linac plus a half-cell SC photo-injector RF electron gun, both operating at 703.75 MHz. The facility is designed for either a high-current mode of operation up to 0.5 A at 703.75 MHz or a high-bunch-charge mode of 5 nC at 10 MHz bunch frequency. The R&D facility serves a test bed for an envisioned electron-hadron collider, eRHIC. The high-current, high-charge operating parameters make effective higher-order-mode (HOM) damping mandatory, and requires the determination of HOM tolerances for a cavity upgrade. The niobium cavity has been tested at superconducting temperatures and has provided measured quality factors (Q) for a large number of modes. These numbers were used for the estimate of the beam breakup instability (BBU). The facility will be assembled with a highly flexible lattice covering a vast operational parameter space for verification of the estimates and to serve as a test bed for the concepts directed at future projects.
Date:
May 23, 2010
Creator:
Ben-Zvi, Ilan; Calaga, R.; Hahn, H.; Hammons, L.; Johnson, E.; Kayran, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Thermal properties for the thermal-hydraulics analyses of the BR2 maximum nominal heat flux.
This memo describes the assumptions and references used in determining the thermal properties for the various materials used in the BR2 HEU (93% enriched in {sup 235}U) to LEU (19.75% enriched in {sup 235}U) conversion feasibility analysis. More specifically, this memo focuses on the materials contained within the pressure vessel (PV), i.e., the materials that are most relevant to the study of impact of the change of fuel from HEU to LEU. This section is regrouping all of the thermal property tables. Section 2 provides a summary of the thermal properties in form of tables while the following sections present the justification of these values. Section 3 presents a brief background on the approach used to evaluate the thermal properties of the dispersion fuel meat and specific heat capacity. Sections 4 to 7 discuss the material properties for the following materials: (i) aluminum, (ii) dispersion fuel meat (UAlx-Al and U-7Mo-Al), (iii) beryllium, and (iv) stainless steel. Section 8 discusses the impact of irradiation on material properties. Section 9 summarizes the material properties for typical operating temperatures. Appendix A elaborates on how to calculate dispersed phase's volume fraction. Appendix B shows the evolution of the BR2 maximum heat flux with burnup.
Date:
May 23, 2011
Creator:
Dionne, B.; Kim, Y. S. & Hofman, G. L. (Nuclear Engineering Division)
Object Type:
Report
System:
The UNT Digital Library
Scenarios For The ATF2 Ultra-Low Betas Proposal
The current ATF2 Ultra-Low beta proposal was designed to achieve 20nm vertical IP beam size without considering the multipolar components of the FD magnets. In this paper we describe different scenarios that avoid the detrimental effect of these multipolar errors to the beam size at the interaction point (IP). The simplest approach consists in modifying the optics, but other solutions are studied as the introduction of super-conducting wigglers to reduce the emittance or the replacement of the normal-conducting focusing quadrupole in the Final Doublet (NC-QF1FF) with a super-conducting quadrupole one (SC-QF1FF). These are fully addressed in the paper.
Date:
May 23, 2010
Creator:
E., Marin; B., Parker & M., Tomas R. Bambade Kuroda S. Okugi T. Tauchi T. Terunuma N. Urakawa J. Seryi A. White G. Woodley
Object Type:
Article
System:
The UNT Digital Library
OECD MMCI Small-Scale Water Ingression and Crust Strength Tests (SSWICS) SSWICS-2 test data report : thermal hydraulic results, Rev. 0 September 20, 2002.
The Melt Attack and Coolability Experiments (MACE) program at Argonne National Laboratory addressed the issue of the ability of water to cool and thermally stabilize a molten core/concrete interaction (MCCI) when the reactants are flooded from above. These tests provided data regarding the nature of corium interactions with concrete, the heat transfer rates from the melt to the overlying water pool, and the role of noncondensable gases in the mixing processes that contribute to melt quenching. However, due to the integral nature of these tests, several questions regarding the crust freezing behavior could not be adequately resolved. These questions include: (1) To what extent does water ingression into the crust increase the melt quench rate above the conduction-limited rate and how is this affected by melt composition and system pressure and (2) What is the fracture strength of the corium crust when subjected to a thermal-mechanical load and how does it depend upon the melt composition? A series of separate-effects experiments are being conducted to address these issues. The first employs an apparatus designed to measure the quench rate of a pool of corium ({approx}{phi}30 cm; up to 20 cm deep). The main parameter to be varied in these quench …
Date:
May 23, 2011
Creator:
Lomperski, S.; Farmer, M. T.; Kilsdonk, D. J.; Aeschlimann, R. W. & Basu, S.
Object Type:
Report
System:
The UNT Digital Library
Linear optics measurements and corrections using an AC dipole in RHIC
We report recent experimental results on linear optics measurements and corrections using ac dipole. In RHIC 2009 run, the concept of the SVD correction algorithm is tested at injection energy for both identifying the artificial gradient errors and correcting it using the trim quadrupoles. The measured phase beatings were reduced by 30% and 40% respectively for two dedicated experiments. In RHIC 2010 run, ac dipole is used to measure {beta}* and chromatic {beta} function. For the 0.65m {beta}* lattice, we observed a factor of 3 discrepancy between model and measured chromatic {beta} function in the yellow ring.
Date:
May 23, 2010
Creator:
Wang, G.; Bai, M. & Yang, L.
Object Type:
Article
System:
The UNT Digital Library
A Model for Tow Impregnation and Consolidation for Partially Impregnated Thermoset Prepregs
The formation and transport of voids in composite materials remains a key research area in composite manufacturing science. Knowledge of how voids, resin, and fiber reinforcement propagate throughout a composite material continuum from green state to cured state during an automated tape layup process is key to minimizing defects induced by void-initiated stress concentrations under applied loads for a wide variety of composite applications. This paper focuses on modeling resin flow in a deforming fiber tow during an automated process of partially impregnated thermoset prepreg composite material tapes. In this work, a tow unit cell based model has been presented that determines the consolidation and impregnation of a thermoset prepreg tape under an input pressure profile. A parametric study has been performed to characterize the behavior of varying tow speed and compaction forces on the degree of consolidation. Results indicate that increased tow consolidation is achieved with slower tow speeds and higher compaction forces although the relationship is not linear. The overall modeling of this project is motivated to address optimization of the 'green state' composite properties and processing parameters to reduce or eliminate 'cured state' defects, such as porosity and de-lamination. This work is partially funded by the Department …
Date:
May 23, 2011
Creator:
Jr, John J. Gangloff; Sinha, Shatil & Advani, Suresh G.
Object Type:
Article
System:
The UNT Digital Library
Progress on Analytical Modeling of Coherent Electron Cooling
We report recent progresses on analytical studies of Coherent Electron Cooling. The phase space electron beam distribution obtained from the 1D FEL amplifier is applied to an infinite electron plasma model and the electron density evolution inside the kicker is derived. We also investigate the velocity modulation in the modulator and obtain a closed form solution for the current density evolution for infinite homogeneous electron plasma.
Date:
May 23, 2010
Creator:
Wang, G.; Blaskiewicz, M.; Litvinenko, V. & Webb, S.
Object Type:
Article
System:
The UNT Digital Library
ASSEMBLY AND TEST OF A 120 MM BORE 15 T NB3SN QUADRUPOLE FOR THE LHC UPGRADE
In support of the Large Hadron Collider (LHC) luminosity upgrade, the US LHC Accelerator Research Program (LARP) has been developing a 1-meter long, 120 mm bore Nb{sub 3}Sn IR quadrupole magnet (HQ). With a design short sample gradient of 219 T/m at 1.9 K and a peak field approaching 15 T, one of the main challenges of this magnet is to provide appropriate mechanical support to the coils. Compared to the previous LARP Technology Quadrupole and Long Quadrupole magnets, the purpose of HQ is also to demonstrate accelerator quality features such as alignment and cooling. So far, 8 HQ coils have been fabricated and 4 of them have been assembled and tested in HQ01a. This paper presents the mechanical assembly and test results of HQ01a.
Date:
May 23, 2010
Creator:
Felice, H.; Caspi, S.; Cheng, D.; Dietderich, D.; Ferracin, P.; Hafalia, R. et al.
Object Type:
Article
System:
The UNT Digital Library
The Greensheet (Houston, Tex.), Vol. 43, No. 197, Ed. 1 Wednesday, May 23, 2012
Free weekly newspaper that includes business and classified advertising.
Date:
May 23, 2012
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Dallas, Tex.), Vol. 36, No. 50, Ed. 1 Wednesday, May 23, 2012
Free weekly newspaper that includes business and classified advertising.
Date:
May 23, 2012
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Summary for Policy-makers
Report summarizing the policy-relevant findings of the Arctic Monitoring and Assessment Programme' 2015 assessments of short-lived climate pollutants (Methane, Black carbon, and Ozone).
Date:
May 23, 2016
Creator:
Arctic Monitoring and Assessment Programme
Object Type:
Report
System:
The UNT Digital Library
OECD/MCCI 2-D Core Concrete Interaction (CCI) tests : final report February 28, 2006.
Although extensive research has been conducted over the last several years in the areas of Core-Concrete Interaction (CCI) and debris coolability, two important issues warrant further investigation. The first issue concerns the effectiveness of water in terminating a CCI by flooding the interacting masses from above, thereby quenching the molten core debris and rendering it permanently coolable. This safety issue was investigated in the EPRI-sponsored Melt Attack and Coolability Experiments (MACE) program. The approach was to conduct large scale, integral-type reactor materials experiments with core melt masses ranging up to two metric tons. These experiments provided unique, and for the most part repeatable, indications of heat transfer mechanism(s) that could provide long term debris cooling. However, the results did not demonstrate definitively that a melt would always be completely quenched. This was due to the fact that the crust anchored to the test section sidewalls in every test, which led to melt/crust separation, even at the largest test section lateral span of 1.20 m. This decoupling is not expected for a typical reactor cavity, which has a span of 5-6 m. Even though the crust may mechanically bond to the reactor cavity walls, the weight of the coolant and the …
Date:
May 23, 2011
Creator:
Farmer, M. T.; Lomperski, S.; Kilsdonk, D. J.; Aeschlimann, R. W. & Basu, S.
Object Type:
Report
System:
The UNT Digital Library
Future Electron-Hadron Colliders
Outstanding research potential of electron-hadron colliders (EHC) was clearly demonstrated by first - and the only - electron-proton collider HERA (DESY, Germany). Physics data from HERA revealed new previously unknown facets of Quantum Chromo-Dynamics (QCD). EHC is an ultimate microscope probing QCD in its natural environment, i.e. inside the hadrons. In contrast with hadrons, electrons are elementary particles with known initial state. Hence, scattering electrons from hadrons provides a clearest pass to their secrets. It turns EHC into an ultimate machine for high precision QCD studies and opens access to rich physics with a great discovery potential: solving proton spin puzzle, observing gluon saturation or physics beyond standard model. Access to this physics requires high-energy high-luminosity EHCs and a wide reach in the center-of-mass (CM) energies. This paper gives a brief overview of four proposed electron-hadron colliders: ENC at GSI (Darmstadt, Germany), ELIC/MEIC at TJNAF (Newport News, VA, USA), eRHIC at BNL (Upton, NY, USA) and LHeC at CERN (Geneva, Switzerland). Future electron-hadron colliders promise to deliver very rich physics not only in the quantity but also in the precision. They are aiming at very high luminosity two-to-four orders of magnitude beyond the luminosity demonstrated by the very successful HERA. …
Date:
May 23, 2010
Creator:
Litvinenko, V.
Object Type:
Article
System:
The UNT Digital Library
Studies of Beam Dynamics for eRHIC
We present our studies on various aspects of the beam dynamics in 'racetrack' design of the first stage electron-ion collider at RHIC (eRHIC), including transverse beam break up instabilities, energy loss due to wakefields, electron beam emittance growth and energy loss due to synchrotron radiation, electron beam losses due to Touschek effects and residue gas scattering, beam-beam effects at the interaction region and emittance growth of ion beam due to electron bunch to bunch noises. For all effects considered above, no showstopper has been found.
Date:
May 23, 2010
Creator:
Wang, G.; Blaskiewicz, M.; Fedotov, A.; Hao, Y.; Kewisch, J.; Litvinenko, V. et al.
Object Type:
Article
System:
The UNT Digital Library
Honduras: Background and U.S. Relations
This report discusses various domestic issues in Honduras, including current political, economic and security conditions. It also examines the implications for U.S. policy.
Date:
May 23, 2016
Creator:
Meyer, Peter J.
Object Type:
Report
System:
The UNT Digital Library
United States Lifts Remaining Restrictions on Arms Sales to Vietnam
This report discusses the recent removal of remaining U.S. restrictions on sales of lethal weapons and related services to Vietnam. During the Vietnam War (1955-1975), the United States imposed a complete embargo on arms sales to North Vietnam, and then expanded it to cover the entire country after Communist forces defeated U.S-backed South Vietnamese government in 1975. In 2007, the Bush Administration eased the ban by allowing non-lethal defense items and defense services to be exported on a case-by-case basis.
Date:
May 23, 2016
Creator:
Manyin, Mark E. & Kerr, Paul K.
Object Type:
Report
System:
The UNT Digital Library
The Bureau of Ocean Energy Management's Five-Year Program for Offshore Oil and Gas Leasing: History and Proposed Program for 2017-2022
The first two sections of this report discuss the history and legal framework for Bureau of Ocean Energy Management's (BOEM) five-year offshore oil and gas leasing programs. Subsequent sections outline BOEM's development process, briefly summarize previous years' programs, and analyze the proposal for 2017-2022. The final section of the report discusses the role of Congress, with a focus on congressional oversight and legislation related to the 2017-2022 program.
Date:
May 23, 2016
Creator:
Comay, Laura B.; Humphries, Marc & Vann, Adam
Object Type:
Report
System:
The UNT Digital Library
FHFA's Administrative Reform of Fannie Mae, Freddie Mac, and the Housing Finance System
This report discusses housing finance reform and structural changes enacted by the Federal Housing Finance Agency (FHFA), particularly in relation to government-sponsored enterprises (GSEs). It includes sections on GSEs and conservatorship; FHFA reforms broken down into information about risk-sharing transactions, a common securitization platform, and single security; and Congressional action on GSE reform.
Date:
May 23, 2016
Creator:
Hoskins, Sean M.
Object Type:
Report
System:
The UNT Digital Library
The Comprehensive Addiction and Recovery Act of 2016 (S. 524): Comparison of Senate- and House-Passed Versions
This report discusses selected differences and similarities between the Senate- and House-passed versions of the Comprehensive Addiction and Recovery Act of 2016 (CARA; S. 524), which aims to address the problem of opioid addiction in the United States. The two versions of the bill differ substantially. The scope of the differences may be illustrated by their structures: The Senate bill has 28 sections organized in 8 titles, whereas the House bill has 69 sections organized in 18 titles.
Date:
May 23, 2016
Creator:
Bagalman, Erin & Sacco, Lisa N.
Object Type:
Report
System:
The UNT Digital Library
OECD MMCI Small-Scale Water Ingression and Crust Strength Tests (Sswics) Sswics-1 Final Data Report, Rev. 1 February 10, 2003.; Report, Rev. 1
The Melt Attack and Coolability Experiments (MACE) program at Argonne National Laboratory addressed the issue of the ability of water to cool and thermally stabilize a molten core/concrete interaction (MCCI) when the reactants are flooded from above. These tests provided data regarding the nature of corium interactions with concrete, the heat transfer rates from the melt to the overlying water pool, and the role of noncondensable gases in the mixing processes that contribute to melt quenching. However, due to the integral nature of these tests, several questions regarding the crust freezing behavior could not be adequately resolved. These questions include: (1) To what extent does water ingression into the crust increase the melt quench rate above the conduction-limited rate and how is this affected by melt composition and system pressure; and (2) What is the fracture strength of the corium crust when subjected to a thermal-mechanical load and how does it depend upon the melt composition? A series of separate-effects experiments are being conducted to address these issues. The first employs an apparatus designed to measure the quench rate of a pool of corium ({approx}{phi}30 cm; up to 20 cm deep). The main parameter to be varied in these quench …
Date:
May 23, 2011
Creator:
Lomperski, S.; Farmer, M. T.; Kilsdonk, D. & Aeschlimann, B. (Nuclear Engineering Division)
Object Type:
Report
System:
The UNT Digital Library