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Tank 241-TX-118, core 236 analytical results for the final report

Description: This document is the analytical laboratory report for tank 241-TX-118 push mode core segments collected between April 1, 1998 and April 13, 1998. The segments were subsampled and analyzed in accordance with the Tank 241-TX-118 Push Mode Core sampling and Analysis Plan (TSAP) (Benar, 1997), the Safety Screening Data Quality Objective (DQO) (Dukelow, et al., 1995), the Data Quality Objective to Support Resolution of the Organic Complexant Safety Issue (Organic DQO) (Turner, et al, 1995) and the H… more
Date: November 19, 1998
Creator: Esch, Ruth A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Structure and Properties of Braided Sleeve Preforms for Chemical Vapor Infiltration

Description: In all composites the properties and structure of the reinforcement strongly influence the performance of the material. For some composites, however, the reinforcement also affects the fabrication process itself exerting an additional, second order influence on performance. This is the case for the chemical vapor infiltration (CVI) process for fabrication of ceramic matrix composites. In this process the matrix forms progressively as a solid deposit, first onto the fiber surfaces, then onto the… more
Date: April 1, 1998
Creator: Starr, Thomas L.; Fiadzo, Odile G. & Hablutzel, Nicole
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Point Defects in Binary Laves-Phase Alloys

Description: Point defect mechanisms in the binary C15 NbCr{sub 2} and NbCo{sub 2}, and C14 NbFe{sub 2} systems on both sides of stoichiometry was studied and clarified by both bulk density and X-ray lattice parameter measurements. It was found that the vacancy concentrations in these systems after quenching from 1000 C are essentially zero. The constitutional defects on both sides of stoichiometry for these systems were found to be of the anti-site type in comparison with the model predictions. However, th… more
Date: November 30, 1998
Creator: Liaw, P. K.; Liu, C. T.; Pike, L. M. & Zhu, J. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Effects of thermomechanical processing on the resulting mechanical properties of 6101 aluminum foam

Description: Porous materials represent a tremendous weight savings for light-weight structural applications. The fabrication path can play a critical role in the resulting properties. High porosity aluminum was fabricated in a number of ways. The starting material was a cast 6101 aluminum that had a relative density of 9.8%. The cast aluminum block was compressed by uniaxial, biaxial, and triaxial densification. Uniaxial compression was done at room temperature and 200 C. Biaxial compression was achieved b… more
Date: December 1, 1998
Creator: Margevicius, R.W.; Stanek, P.W. & Jacobson, L.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Steam chemical reactivity of plasma-sprayed beryllium

Description: Plasma-spraying with the potential for in-situ repair makes beryllium a primary candidate for plasma facing and structural components in experimental magnetic fusion machines. Deposits with good thermal conductivity and resistance to thermal cycling have been produced with low pressure plasma-spraying (LPPS). A concern during a potential accident with steam ingress is the amount of hydrogen produced by the reactions of steam with hot components. In this study the authors measure the reaction ra… more
Date: July 1, 1998
Creator: Anderl, R. A.; Pawelko, R. J.; Smolik, G. R. & Castro, R. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Application of cathodic arc deposited amorphous hard carbon films to the head/disk tribology

Description: Amorphous hard carbon films deposited by filtered cathodic arc deposition exhibit very high hardness and elastic modulus, high mass density, low coefficient of friction, and the films are very smooth. All these properties are beneficial to applications of these films for the head/disk interface tribology. The properties of cathodic arc deposited amorphous carbon films are summarized, and they are compared to sputter deposited, hydrogenated (CH{sub x}), and nitrogenated (CN{sub x}) carbon films … more
Date: April 1998
Creator: Anders, S.; Bhatia, C. S.; Fong, W.; Lo, R. Y. & Bogy, D. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mechanical properties of a structural polyurethane foam and the effect of particulate loading

Description: The room temperature mechanical properties of a closed-cell, polyurethane encapsulant foam have been measured as a function of foam density. Tests were performed on both unfilled and filler reinforced specimens. Over the range of densities examined, the modulus of the unloaded foam could be described by a power-law relationship with respect to density. This power-law relationship could be explained in terms of the elastic compliance of the cellular structure of the foam using a simple geometric… more
Date: April 1, 1998
Creator: Goods, S.H.; Neuschwanger, C.L. & Whinnery, L.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

TEPIC -- A new high temperature structural foam

Description: The formulation, processing characteristics, microstructure and mechanical properties of a new structural foam, suitable for use at service temperatures up to 200 C, are reported. In each of these respects, the foam is compared to an existing material, called APO-BMI that is currently in use. When these two foams are directly compared, the new foam, called TEPIC, is found to be superior in its mechanical performance. TEPIC is formulated from a non-carcinogenic isocyanate, a di-functional epoxid… more
Date: October 1, 1998
Creator: Whinnery, L. L.; Goods, S. H.; Tootle, M. L. & Neuschwanger, C. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Methodology for uncertainty estimation of Hanford tank chemical and radionuclide inventories and concentrations

Description: The exact physical and chemical nature of 55 million gallons of toxic waste held in 177 underground waste tanks at the Hanford Site is not known with sufficient detail to support the safety, retrieval, and immobilization missions presented to Hanford. The Hanford Best Basis team has made point estimates of the inventories in each tank. The purpose of this study is to estimate probability distributions for each of the 71 analytes and 177 tanks that the Hanford Best Basis team has made point esti… more
Date: February 1, 1998
Creator: Chen, G.; Ferryman, T. A. & Remund, K. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Characterization of hydrogeologic units using matrix properties, Yucca Mountain, Nevada

Description: Determination of the suitability of Yucca Mountain, in southern Nevada, as a geologic repository for high-level radioactive waste requires the use of numerical flow and transport models. Input for these models includes parameters that describe hydrologic properties and the initial and boundary conditions for all rock materials within the unsaturated zone, as well as some of the upper rocks in the saturated zone. There are 30 hydrogeologic units in the unsaturated zone, and each unit is defined … more
Date: September 1, 1998
Creator: Flint, L.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Phase II of the demonstration of the Koppelman series C process. Topical report, February 1995--February 1996

Description: A pilot plant using the Koppelman Series C Process was designed, constructed, and operated near Gillette, Wyoming, as part of Phase I of this project. Construction was completed in late fall of 1993, and the shakedown was completed in early 1994. The initial series of tests performed to prove the process and to characterize the effluents was conducted during the first half of 1994. The results of those tests are described in the final report for Phase I. This report describes the activities con… more
Date: December 31, 1998
Creator: Merriam, N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Microstructures and mechanical properties of sputtered Cu/Cr multilayers

Description: The microstructures and mechanical properties of Cu/Cr multilayers prepared by sputtering onto {l_brace}100{r_brace} Si substrates at room temperature are presented. The films exhibit columnar grain microstructures with nanoscale grain sizes. The interfaces are planar and abrupt with no intermixing, as expected from the phase diagram. The multilayers tend to adopt a Kurdjumov-Sachs (KS) orientation relationship: {l_brace}110{r_brace}Cr // {l_brace}111{r_brace}Cu, <111>Cr // <110>Cu. The hardnes… more
Date: March 1, 1998
Creator: Misra, A.; Kung, H.; Mitchell, T.E.; Jervis, T.R. & Nastasi, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Advances in beryllium powder consolidation simulation

Description: A fuzzy logic based multiobjective genetic algorithm (GA) is introduced and the algorithm is used to optimize micromechanical densification modeling parameters for warm isopressed beryllium powder, HIPed copper powder and CIPed/sintered and HIPed tantalum powder. In addition to optimizing the main model parameters using the experimental data points as objective functions, the GA provides a quantitative measure of the sensitivity of the model to each parameter, estimates the mean particle size o… more
Date: December 1, 1998
Creator: Reardon, B. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

PROVIDING SOLUTIONS TO ENERGY AND ENVIRONMENTAL PROBLEMS

Description: Task Objectives: (1) Support the shakedown of the commercial plant. The plant, which was completed in early 1997, uses the Series C process, which was proven at the pilot-plant scale during Phase I of this project. (2) Improve the Series C process for future plants by completing construction and testing a pilot-scale coal-in-shell processor. This high-throughput, low-cost variation of the process will greatly reduce the cost of future plants using the Series C process. (3) Continue testing the … more
Date: July 1, 1998
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mechanical behavior of robocast alumina

Description: Direct fabrication of alumina parts by robocasting was completed. This method is based on three-dimensional deposition of binderless aqueous alumina slurries. Parts were made with different deposition paths and mechanical testing performed to determine the effects of bead alignment. Properties were also compared to alumina processed more traditionally.
Date: December 1, 1998
Creator: Denham, H. B.; Cesarano, J., III; King, B. H. & Calvert, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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