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in subjects: "Bulk Density"

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PROVIDING SOLUTIONS TO ENERGY AND ENVIRONMENTAL PROBLEMS

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: Report

Partner: UNT Libraries Government Documents Department

open access

Steam chemical reactivity of plasma-sprayed beryllium

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: Report

Partner: UNT Libraries Government Documents Department

open access

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

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: Report

Partner: UNT Libraries Government Documents Department

open access

TEPIC -- A new high temperature structural foam

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: Report

Partner: UNT Libraries Government Documents Department

open access

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

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: Report

Partner: UNT Libraries Government Documents Department

open access

Point Defects in Binary Laves-Phase Alloys

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: Article

Partner: UNT Libraries Government Documents Department

open access

Advances in beryllium powder consolidation simulation

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: Report

Partner: UNT Libraries Government Documents Department

open access

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

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: Report

Partner: UNT Libraries Government Documents Department

open access

Mechanical behavior of robocast alumina

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: 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

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: Report

Partner: UNT Libraries Government Documents Department

open access

OPTIMIZING PERFORMANCE OF THE HESKETT STATION

The overall conclusion from this work is that a switch from river sand bed material to limestone at the R.M. Heskett Station would provide substantial benefits to MDU. A switch to limestone would increase the fuel flexibility of the unit, allowing fuels higher in both sodium and sulfur to be burned. The limestone bed can tolerate a much higher buildup of sodium in the bed without agglomeration, allowing either the bed turnover rate to be reduced to half the current sand feed rate for a fuel wit… more

Date: March 1, 1999

Creator: Mann, Michael D. & Henderson, Ann K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

NONEQUILIBRIUM SULFUR CAPTURE AND RETENTION IN AN AIR COOLED SLAGGING COAL COMBUSTOR

Calcium oxide injected in a slagging combustor reacts with the sulfur from coal combustion to form sulfur-bearing particles. They are deposited on the liquid slag layer on the combustor wall. Due to the low solubility of sulfur in slag, slag must be rapidly drained from the combustor to limit sulfur gas re-evolution. Analysis indicated that slag mass flow rates in excess of 400 lb/hr should limit sulfur re-evolution. The objective of this 42-month project was to perform a series of tests to det… more

Date: March 15, 1999

Creator: Zauderer, Dr. Bert

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Compaction Stress in Fine Powders

A vexing feature in granular materials compaction is density extrema interior to a compacted shape. Such inhomogeneities can lead to weaknesses and loss of dimensional control in ceramic parts, unpredictable dissolution of pharmaceuticals, and undesirable stress concentration in load-bearing soil. As an example, the centerline density in a cylindrical compact often does not decrease monotonically from the pressure source but exhibits local maxima and minima. Two lines of thought in the literatu… more

Date: April 1, 1999

Creator: Hurd, A. J.; Kenkre, V. M.; Pease, E. A. & Scott, J. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Diffusive Barrier and Getter Under Waste Packages VA Reference Design Feature Evaluations

This technical document evaluates those aspects of the diffusive barrier and getter features which have the potential for enhancing the performance of the Viability Assessment Reference Design and are also directly related to the key attributes for the repository safety strategy of that design. The effects of advection, hydrodynamic dispersion, and diffusion on the radionuclide migration rates through the diffusive barrier were determined through the application of the one-dimensional, advectio… more

Date: May 24, 1999

Creator: MacNeil, K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Accelerated alpha radiation damage in a ceramic waste form, interim results

Interim results are presented on the alpha-decay damage study of a {sup 238}Pu-loaded ceramic waste form (CWF). The waste form was developed to immobilize fission products and transuranic species accumulated from the electrometallurgical treatment of spent nuclear fuel. To evaluate the effects of {alpha}-decay damage on the waste form the {sup 238}Pu-loaded material was analyzed by (1) x-ray diffraction (XRD), (2) microstructure characterization by scanning electron microscopy (SEM) and transmi… more

Date: November 11, 1999

Creator: Frank, S. M.; Johnson, S. G.; Moschetti, T. L.; O'Holleran, T. P.; Sinkler, W.; Esh, D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Bonding topologies in diamondlike amorphous-carbon films

The carbon ion energy used during filtered cathodic vacuum arc deposition determines the bonding topologies of amorphous-carbon (a-C) films. Regions of relatively low density occur near the substrate/film and film/surface interfaces and their thicknesses increase with increasing deposition energy. The ion subplantation growth results in mass density gradients in the bulk portion of a-C in the growth direction; density decreases with distance from the substrate for films grown using ion energies… more

Date: January 27, 2000

Creator: Siegal, Michael P.; Provencio, Paula N.; Tallant, David R.; Simpson, Regina L.; Kleinsorge, B. & Milne, W. I.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Ultrahard carbon nanocomposite films

Modest thermal annealing to 600 C of diamondlike amorphous-carbon (a-C) films grown at room temperature results in the formation of carbon nanocomposites with hardness similar to diamond. These nanocomposite films consist of nanometer-sized regions of high density a-C embedded in an a-C matrix with a reduced density of 5--10%. The authors report on the evolution of density and bonding topologies as a function of annealing temperature. Despite a decrease in density, film hardness actually increa… more

Date: January 27, 2000

Creator: Siegal, Michael P.; Tallant, David R.; Provencio, Paula P.; Overmyer, Donald L.; Simpson, Regina L. & Martinez-Miranda, L. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Mechanical properties and shear failure surfaces of two alumina powders in triaxial compression

In the manufacture of ceramic components, near-net-shape parts are commonly formed by uniaxially pressing granulated powders in rigid dies. Density gradients that are introduced into a powder compact during press-forming often increase the cost of manufacturing, and can degrade the performance and reliability of the finished part. Finite element method (FEM) modeling can be used to predict powder compaction response, and can provide insight into the causes of density gradients in green powder c… more

Date: April 24, 2000

Creator: Zeuch, David H.; Grazier, J. Mark; Arguello, Jose G., Jr. & Ewsuk, Kevin G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

PROOF OF PRINCIPAL TEST TO FEED AND METER GRANULAR COAL INTO 450 psig GAS PRESSURE

This research program is concerned with the development of a new form of feeder, known as the Stamet Posimetric O High Pressure Solids Feeder, to feed dry granular solids continuously and controllably into gas pressure. The device is a rotary mechanical feeder, which utilizes the interlocking and internal friction of the granular solids to drive the solids through into the outlet pressure in a continuous and controllable way, using a continuous solids material seal on the feeder outlet to contr… more

Date: July 1, 2000

Creator: Aldred, Derek L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Simulation of Granular Compacts in Two Dimensions

Simulations of granular packings in 2-D by throwing disks in a rectangular die are performed. Different size distributions as bimodal, uniform and gaussian are used. Once the array of particles is done, a relaxation process is carried on using a large-amplitude, low-frequency vertical shaking. This relaxation is performed a number N of times. Then, the authors measure the density of the package, contact distribution, coordination number distribution, entropy and also the disks size distribution… more

Date: July 24, 2000

Creator: Vidales, A. M.; Kenkre, V. M. & Hurd, Alan J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Segmented Aluminum Honeycomb Characteristics in T-Direction, Dynamic Crush Environments

Thirteen segmented aluminum honeycomb samples (5 in. diameter and 1.5 in. height) have been crushed in an experimental configuration that uses a drop table impact machine. The 38.0 pcf bulk density samples are a unique segmented geometry that allows the samples to be crushed while maintaining a constant cross-sectional area. A crush weight of 175 lb was used to determine the rate sensitivity of the honeycomb's highest strength orientation, T-direction, in a dynamic environment of {approx}50 fps… more

Date: August 23, 2000

Creator: Bateman, Vesta I.; Brown, Frederick A.; Nusser, Michael A. & Swanson, Lloyd H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Development for the Optional Use of Circular Core Tubes with the High Shear Stress Flume

In this study, the erosion rates of four reconstituted sediments in both rectangular and circular sample tubes have been determined as a function of density and shear stress by means of a high shear stress sediment erosion flume at Sandia National Laboratories. This was done to determine if circular cores used in field sampling would provide the same results found using the existing technology of rectangular cores. Two samples were natural, cohesive sediments retrieved from different sites in t… more

Date: March 1, 2001

Creator: ROBERTS, JESSE D. & JEPSEN, RICHARD A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

PRODUCTION OF NEW BIOMASS/WASTE-CONTAINING SOLID FUELS

CQ Inc. and its team members (ALSTOM Power Inc., Bliss Industries, McFadden Machine Company, and industry advisors from coal-burning utilities, equipment manufacturers, and the pellet fuels industry) addressed the objectives of the Department of Energy and industry to produce economical, new solid fuels from coal, biomass, and waste materials that reduce emissions from coal-fired boilers. This project builds on the team's commercial experience in composite fuels for energy production. The elect… more

Date: April 20, 2001

Creator: Akers, David J.; Shirey, Glenn A.; Zitron, Zalman & Maney, Charles Q.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Data Qualification Report: Calculated Porosity and Porosity-Derived Values for Lithostratigraphic Units for use on the Yucca Mountain Project

The qualification is being completed in accordance with the Data Qualification Plan DQP-NBS-GS-000006, Rev. 00 (CRWMS M&O 2001). The purpose of this data qualification activity is to evaluate for qualification the unqualified developed input and porosity output included in Data Tracking Number (DTN) M09910POROCALC.000. The main output of the analyses documented in DTN M09910POROCALC.000 is the calculated total porosity and effective porosity for 40 Yucca Mountain Project boreholes. The poro… more

Date: May 30, 2001

Creator: Sanchez, P.

Item Type: Report

Partner: UNT Libraries Government Documents Department