Serial/Series Title
Chemical Processing Department Monthly Report
15
Fiscal Year 2004
3
Fiscal Year 2005
3
Fiscal Year 2001
2
Fiscal Year 2007
2
Irradiation Processing Department Monthly Record Report
2
A Novel Membrane Reactor for Direct Hydrogen Production From Coal Progress Report
1
A Real-Time Coal Content/Ore Grade (C2OG) Sensor, Technical Report
1
BEETIT Program
1
Carbon Sequestration on Surface Mine Lands Quarterly Report
1
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3,099 Matching Results
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GEOLOGIC DISPOSAL OF HEU ALUMINUM-BASED DOE FUELS
None
Date:
March 22, 1998
Creator:
J. WESLEY DAVIS, DR. PETER GOTTLIEB
Object Type:
Report
System:
The UNT Digital Library
LOTIS: GRB follow-up observations at early times
LOTIS is an automated wide field-of-view telescope system capable of responding to GRB events as early as 10s after a trigger from the GCN which rapidly distributes coordinates from the Beppo/SAX, BATSE and RXTE instruments. Measurements of optical activity at these early times will provide important clues to the GRB production mechanism. In over two year's of operation, LOTIS has responded to 40 GCN triggers including GRB971217 with l10s and GRB980703 within 5 hours. We report results from these events and constraints on simultaneous optical signals during these GRB's.
Date:
February 22, 1999
Creator:
Park, H. S.
Object Type:
Article
System:
The UNT Digital Library
Coarsening in Multicomponent Multiphase Systems [Final Report, November 1, 1995--October 31, 1998]
The goal of the project was to extend the theory of particle coarsening, which is well established for binary systems, to the case of multicomponent and multiphase alloys. The theoretical approach involved three stages: (1) a mean field description based on the Lifshitz-Slyozov-Wagner (LSW) [1,2] formulation (recently published in Acta Mater. [3]), (2) an analytical description of coarsening valid at small volume fractions where the Marqusee and Ross [4] model was employed and (3) a numerical simulation of three phase coarsening where the boundary integral method of Akaiwa and Voorhees [5] was implemented. The main result of the mean field analysis can be stated as follows. The growth rate of a particle from a particular phase in a multiphase system is precisely the same as that derived for a single phase, multicomponent system. Also, it was found that the scaled particle size distribution for each phase in the system has exactly the same form as that originally derived by LSW. Since it neglects particle interactions, the mean field theory is clearly unrealistic and as such the formulation of coarsening in low volume fraction multiphase systems was undertaken.
Date:
October 22, 1999
Creator:
Hoyt, J.J.
Object Type:
Report
System:
The UNT Digital Library
Compositions, Functions, and Testing of Friction Brake Materials and Their Additives
The purpose of this report is to present a survey of commercial brake materials and additives, and to indicate their typical properties and functions, especially as regards their use in heavy trucks. Most truck pad and shoe materials described here were designed to wear against cast iron. Brake material test methods are also briefly described. This report does not address issues associated with the fabrication and manufacturing of brake materials. Since there are literally thousands of brake material additives, and their combinations are nearly limitless, it is impractical to list them all here. Rather, an attempt has been made to capture the primary constituents and their functions. An Appendix contains thermo-physical properties of some current and potential brake materials.
Date:
October 22, 2001
Creator:
Blau, PJ
Object Type:
Report
System:
The UNT Digital Library
Development of singularities in Riemann Invariants
Shocks form in finite time in systems of quasilinear hyperbolic equations in one space variable which are genuinely nonlinear. The authors write down a simple geometric construction for systems of two equations, and use it to obtain a priori estimates for the growth of the derivatives. They also find realistic bounds on the maximum and minimum time of existence of smooth solutions for large amplitude waves in a model system of an unusual type.
Date:
May 22, 1992
Creator:
Keyfitz, B.L.
Object Type:
Report
System:
The UNT Digital Library
SunSine{trademark}300: Manufacture of an AC Photovoltaic Module; Final Report Phases I & II; 25 July 1995-30 June 1998
The purpose of this PVMaT subcontract was to establish manufacturing capability and enter commercial production with the SunSine{trademark}300 AC Module. This goal was achieved when production began in September 1997, first units were shipped in December 1997, and the pilot production of 109 units was completed in the spring of 1998. As of the completion of this PVMaT project, production capacity is 2500 units per year, which represents 627.5 kW AC {at} STC. This report provides the background of the development process that led to a commercial version of the SunSine{trademark}300; describes the SunSine{trademark}300 product, including theory of operation; provides a summary of all the significant test methods that were applied to prototypes of the product, with a summary of test results; and ends with a summary of the production process and a list of project sponsors who received units for evaluation.
Date:
March 22, 1999
Creator:
Kern, G.
Object Type:
Report
System:
The UNT Digital Library
New CDF end-plug calorimeter
The performance of the CDF end-plug calorimeter is described. The authors determined the energy resolutions to be {sigma}/{Epsilon} = 14.5%/{radical}{Epsilon} {circle{underscore}plus} 0.7% for electron and {sigma}/{Epsilon} = 68.0%/{radical}{Epsilon} {circle{underscore}plus} 4.1% for charged pion, where {Epsilon} is the energy measured in GeV. The response linearities satisfied their requirements. The response variations on the surface of a typical tower were measured to be 2.3% for e{sup +} and 1.6% for {pi}{sup +}. For the photon conversion detection by the preshower detector, they obtained the detection efficiency for two minimum ionizing particles to be 90--100% for the phototube gains of (1--4) x 10{sup 5}. The rate of {pi}{sup +'s} depositing large fractions of energy in the electromagnetic section could be reduced by factors of 1.4--2.0 with keeping 95% efficiency for e{sup +}.
Date:
February 22, 2000
Creator:
Oishi, R.
Object Type:
Article
System:
The UNT Digital Library
U.S. Department of Energy integrated manufacturing predoctoral fellowships: Fellows` annual report 1997--1998
In the uniform droplet spray (UDS) process, a jet of liquid metal is broken up into uniform droplets by applying a periodic perturbation to the jet at a specific frequency and amplitude. The droplets are electrically charged to the same polarity to prevent in-flight merging. As a result of the uniform droplet size distribution, the dynamic and thermal states of the droplets can be precisely controlled in the UDS process. Before the UDS process can be applied to the production of aluminum sheets, the thermal history of the droplets must be understood. The incoming thermal state of the droplets at impact with the substrate significantly affects the degree of droplet consolidation as well as the microstructural grain size, which in turn determine the final material properties of the sprayed part. Therefore, the first step in this research was to simulate and measure the droplet thermal state during flight. The thermal state of a solidifying droplet is defined by its temperature and volume fraction of solid. To predict the temperature and solid fraction of the droplets as functions of flight distance, a thermal model was developed for aluminum binary alloy droplets by assuming Newtonian cooling, no undercooling, and local equilibrium at …
Date:
May 22, 1998
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Comparison of the electrochemical properties of several commercial graphites with a templated disordered carbon
A templated carbon was prepared by the pyrolysis of pyrene impregnated into pillared clay (PILC). The electrochemical performance of this was evaluated with the goal of using this material as an anode in Li-ion cells. The reversible capacity was measured as a function of C rate and the cycling characteristics were determined for various intercalation protocols. The performance of this material was compared to that of several commercial graphites tested under the same conditions. The PILC carbon shows great promise as a Li-ion anode if the fade and first-cycle losses can be controlled.
Date:
March 22, 2000
Creator:
GUIDOTTI,RONALD A.; REINHARDT,FREDERICK W. & SANDI,GISELLE
Object Type:
Article
System:
The UNT Digital Library
The Propagation and Backscattering of Soliton-Like Pulses in a Chain of Quartz Beads and Related Problems. (I). Propagation
We confirm that for vanishingly small loading and large impact condition, it may be possible to generate solitons in a chain of grains that are characterized by Herkian contacts. For uniform or progressive loading conditions throughout the chain, one generates soft-solitons which are weakly dispersive in space and time. Under conditions of weak impact one generates acoustic pulses through the chain. We describe the displacements, velocities and accelerations suffered by the individual grains when subjected to solitons, soft-solitons and acoustic pulses and describe the effects of restitution on the propagating pulse.
Date:
January 22, 2000
Creator:
MANCIU,MARIAN; SEN,SURAJIT & HURD,ALAN J.
Object Type:
Article
System:
The UNT Digital Library
Evaluation of oxide dispersion strengthened (ODS) molybdenum and molybdenum-rhenium Alloys
Oxide dispersion strengthened (ODS) molybdenum alloys being developed for high temperature applications possess excellent high temperature strength and creep resistance. In addition they exhibit a ductile-to-brittle transition temperature (DBIT) in the worked and stress-relieved condition under longitudinal tensile load well below room temperature. However, in the recrystallized condition, the DBTT maybe near or above room temperature, depending on the volume fraction of oxide dispersion and the amount of prior work. Dilute rhenium additions (7 and 14 wt.%) to ODS molybdenum were evaluated to determine their effect on low temperature ductility. The addition of 7 wt.% rhenium to the ODS molybdenum did not significantly enhance the mechanical properties. However, the addition of 14 wt.% rhenium to the ODS molybdenum resulted in a DBTT well below room temperature in both the stress-relieved and recrystallized condition. Additionally, the tensile strength of ODS Mo-14Re is greater than the base ODS molybdenum at 1,000 to 1,250 C.
Date:
October 22, 1999
Creator:
Mueller, A.J.; Bianco, R. & Buckman, R.W. Jr.
Object Type:
Article
System:
The UNT Digital Library
Project W-236A multi-function waste tank facility waste feed projections
A review of Hanford Underground Waste Storage Tank Chemistry, coupled with planned remediation actions and retrieval sequences was conducted in order to predict the chemistry of the waste to be stored in the MWTF tanks. All projected waste solutions to be transferred to the MWTF tanks were found to be in compliance with current tank chemistry specifications; therefore, the waste and the tank materials of construction are expected to be compatible.
Date:
December 22, 1994
Creator:
Larrick, A. P.
Object Type:
Report
System:
The UNT Digital Library
Simulation Study of Three-Dimensional Laser Cooling Schemes for Fast Stored Beams
Molecular dynamics (MD) approach is employed to study laser cooling of fast circulating beams in a storage ring. The authors compare several three-dimensional (3D) cooling methods, examining achievable minimum beam temperature. In particular, the stress is put upon the three coupling schemes, i.e. the dispersion-coupling scheme, the coupling-cavity scheme, and the tapered cooling scheme. The authors show that beam temperatures much lower than the currently achievable level could be reached with these schemes.
Date:
June 22, 1998
Creator:
Kihara, T.; Okamoto, H.; Iwashita, Y.; Oide, K.; Lamanna, G. & Wei, J.
Object Type:
Article
System:
The UNT Digital Library
Tutorial on beam current monitoring
This paper is a tutorial level review covering a wide range of aspects related to charged particle beam current measurement. The tutorial begins with a look at the characteristics of the beam as a signal source, the associated electromagnetic fields, the influence of the typical accelerator environment on those fields, and the usual means of modifying and controlling that environment to facilitate beam current measurement. Short descriptions of three quite different types of current monitors are presented and a quantitative review of the classical transformer circuit is given. Recognizing that environmental noise pick-up may present a large source of error in quantitative measurements, signal handling considerations are given considerable attention using real-life examples. An example of a successful transport line beam current monitor implementation is presented and the tutorial concludes with a few comments about signal processing and current monitor calibration issues.
Date:
June 22, 2000
Creator:
Webber, Robert C.
Object Type:
Article
System:
The UNT Digital Library
Tetrahedral mesh improvement via optimization of the element condition number
The authors present a new shape measure for tetrahedral elements that is optimal in that it gives the distance of a tetrahedron from the set of inverted elements. This measure is constructed from the condition number of the linear transformation between a unit equilateral tetrahedron and any tetrahedron with positive volume. Using this shape measure, they formulate two optimization objective functions that are differentiated by their goal: the first seeks to improve the average quality of the tetrahedral mesh; the second aims to improve the worst-quality element in the mesh. They review the optimization techniques used with each objective function and presents experimental results that demonstrate the effectiveness of the mesh improvement methods. They show that a combined optimization approach that uses both objective functions obtains the best-quality meshes for several complex geometries.
Date:
May 22, 2000
Creator:
Freitag, Lori A. & Knupp, Patrick
Object Type:
Article
System:
The UNT Digital Library
Review and perspectives on spallings release models in the 1996 performance assessment for the Waste Isolation Pilot Plant
The Waste Isolation Pilot Plant was licensed for disposal of transuranic wastes generated by the US Department of Energy. The facility consists of a repository mined in a bedded salt formation, approximately 650 m below the surface. Regulations promulgated by the US Environmental Protection Agency require that performance assessment calculations for the repository include the possibility that an exploratory drilling operation could penetrate the waste disposal areas at some time in the future. Release of contaminated solids could reach the surface during a drilling intrusion. One of the mechanisms for release, known as spallings, can occur if gas pressures in the repository exceed the hydrostatic pressure of a column of drilling mud. Calculation of solids releases for spallings depends critically on the conceptual models for the waste, for the spallings process, and assumptions regarding driller parameters and practices. The paper presents a review of the evolution of these models during regulatory review of the Compliance Certification Application for the repository. A summary and perspectives on the implementation of conservative assumptions in model development are also provided.
Date:
May 22, 2000
Creator:
Knowles, M. K; Hansen, F. D.; Thompson, T. W.; Schatz, J. F. & Gross, M.
Object Type:
Article
System:
The UNT Digital Library
Mercury speciation modeling using site specific chemical and redox data from the TNXOD OU
The objective of this study was to evaluate mercury speciation under reducing conditions expected in sediments at the TNX Outfall Delta Operable Unit. These changes in speciation would then be used to infer whether mercury toxicity and mobility would be expected to be significantly altered under reducing conditions. The results from this work suggest that mercury would likely become more strongly retained by the solid phase under reducing conditions than under oxidizing conditions at the TNX Outfall Delta Site. Considering that experimental results indicate that mercury is extremely tightly bound to the solid phase under oxidizing conditions, little mercury mobility would therefore be expected under reducing conditions.
Date:
March 22, 2000
Creator:
Kaplan, D.I.
Object Type:
Report
System:
The UNT Digital Library
RANDOM AND SYSTEMATIC FIELD ERRORS IN THE SNS RING: A STUDY OF THEIR EFFECTS AND COMPENSATION
The Accumulator Ring for the proposed Spallation Neutron Source (SNS) [l] is to accept a 1 ms beam pulse from a 1 GeV Proton Linac at a repetition rate of 60 Hz. For each beam pulse, 10{sup 14} protons (some 1,000 turns) are to be accumulated via charge-exchange injection and then promptly extracted to an external target for the production of neutrons by spallation. At this very high intensity, stringent limits (less than two parts in 10,000 per pulse) on beam loss during accumulation must be imposed in order to keep activation of ring components at an acceptable level. To stay within the desired limit, the effects of random and systematic field errors in the ring require careful attention. This paper describes the authors studies of these effects and the magnetic corrector schemes for their compensation.
Date:
June 22, 1998
Creator:
Gardner, C. J.; Lee, Y. Y. & Weng, W. T.
Object Type:
Article
System:
The UNT Digital Library
Radionuclide transport in the vicinity of the repository and associated complementary cumulative distribution functions in the 1996 performance assessment for the Waste Isolation Pilot Plant
The following topics related to radionuclide transport in the vicinity of the repository in the 1996 performance assessment for the Waste Isolation Pilot Plant are presented (1) mathematical description of models, (2) uncertainty and sensitivity analysis results arising from subjective (i.e., epistemic) uncertainty for individual releases, (3) construction of complementary cumulative distribution functions (CCDFs) arising from stochastic (i.e., aleatory) uncertainty, and (4) uncertainty and sensitivity analysis results for CCDFs. The presented results indicate that no releases to the accessible environment take place due to radionuclide movement through the anhydrite marker beds, through the Dewey Lake Red Beds or directly to the surface, and also that the releases to the Culebra Dolomite are small. Even when the effects of uncertain analysis inputs are taken into account, the CCDFs for release to the Culebra Dolomite fall to the left of the boundary line specified in the US Environmental Protection Agency's standard for the geologic disposal of radioactive waste (40 CFR 191, 40 CFR 194).
Date:
May 22, 2000
Creator:
Stockman, Christine T.; Garner, J. W.; Helton, Jon Craig; Johnson, Jay Dean; Shinta, A. & Smith, L. N.
Object Type:
Article
System:
The UNT Digital Library
The triangle anomaly in the tripple-regge limit
The U(l) triangle anomaly is present, as an infra-red divergence, in the six-reggeon triple-regge interaction vertex obtained from a maximally non-planar Feynman diagram in the full triple-regge limit of three-to-three quark scattering.
Date:
November 22, 1999
Creator:
White, A. R.
Object Type:
Article
System:
The UNT Digital Library
Research needs of c-Si technology required to meet roadmap milestones
In this paper, the authors examined the areas in c-Si growth, materials, and processing that require improvement through research to overcome barriers to the implementation of the photovoltaic road maps's Si goals. To obtain PV module throughput to the roadmap target of 200 MW/factory/year, the typical Si PV factory must produce >4,000 m{sup 2}/day of silicon.
Date:
April 22, 2000
Creator:
Ruby, Douglas S.; Ciszek, T. F. & Sopori, B. L.
Object Type:
Article
System:
The UNT Digital Library
AA Fest General Circulation Model Development: Past, Present and Future. A Symposium in Honor of Professor Akio Arakawa
On January 20-22, 1998, ''AA Fest. A Symposium on General Circulation Model Development: Past, Present, and Future'' was held at the North West Campus Auditorium of University of California, Los Angeles, in honor of Professor Ako Arawaka. The symposium consisted of two-and-a-half-day technical presentations, along with a banquet in the opening evening and a reception during the poster session of the second evening.
Date:
January 22, 1998
Creator:
Ide, Kayo
Object Type:
Article
System:
The UNT Digital Library
TEAM-like workshops in related areas : cooperation in modeling for competitive industries.
The TEAM Workshops originated from problems in fusion research. Based on recent observations regarding automotive modeling, the author asks whether TEAM-like workshops, and the accompanying cooperation among modelers, are of value in areas of economic competition.
Date:
November 22, 1999
Creator:
Turner, L. R.
Object Type:
Article
System:
The UNT Digital Library
Potential of the acousto-ultrasound method to characterize the strength of hot gas filter materials.
None
Date:
January 22, 2002
Creator:
Pastila, P.; Nikkila, A.-P.; Mantyla, T.; Ellingson, W.; Koehl, E. R. & Sandberg, D.
Object Type:
Article
System:
The UNT Digital Library