1,031 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Solids"  
Results: 1 - 24 next
open access

Characterization of solids in the Three Mile Island Unit 2 Reactor defueling water: Addendum

Description: Shortly after ORNL/TM-10362 was issued, it was discovered that a series of 31 figures had been inadvertently omitted. These figures, which consist of scanning electron microscope (SEM) photographs and energy-dispersive X-ray fluorescence scans, provide significant information about the results obtained in the tests performed with water sample W3. This Addendum includes these figures. Details of and comments on the SEM photographs may be found in ORNL/TM-10362.
Date: March 1, 1988
Creator: Campbell, D.O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Equation of state of solid neon from x-ray diffraction measurements to 110 GPa

Description: This paper briefly discusses the pressure-volume properties of condensed neon. X-ray diffraction techniques are used to determine solid neon equation of state and crystal structure. 16 refs., 2 figs. (LSP)
Date: January 1, 1987
Creator: Hemley, R. J.; Jephcoat, A. P.; Zha, C. S.; Mao, H. K.; Finger, L. W. & Cox, D. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Transport of solid commodities via freight pipeline: demand analysis methodology. Volume IV. First year final report

Description: In order to determine the feasibility of intercity freight pipelines, it was necessary to determine whether sufficient traffic flows currently exist between various origins and destinations to justify consideration of a mode whose operating characteristics became competitive under conditions of high-traffic volume. An intercity origin/destination freight-flow matrix was developed for a large range of commodities from published sources. A high-freight traffic-density corridor between Chicago and… more
Date: July 1, 1976
Creator: Allen, W.B. & Plaut, T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The electronic structure of condensed molecular systems

Description: We have reviewed some of the basic properties of the electronic structure of condensed molecular systems. For the rare-gas solids, we concentrated our discussion on changes in the ground- and excited-state crystal-atomic wave functions as calculated with an approximate theoretical method. Compression of these wave functions leads to a softening of the equation of state at high densities, which seems to account for much of the total many-body effects. This compression is a true many-body effect … more
Date: January 1, 1988
Creator: LeSar, R.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Trends in resonance ionization spectroscopy

Description: The author reviews the history of resonance ionization spectroscopy and then comments on the delineations of RIS with reference to many related laser processes. The substance of the paper deals with the trends in RIS and especially how the needs for sensitive analytical methods have overshadowed the orginal plan to study excited species. 9 refs., 1 fig.
Date: January 1, 1986
Creator: Hurst, G.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Photoemission from solids: the transition from solid-state to atomic physics

Description: As the photon energy is increased, photoemission from solids undergoes a slow transition from solid-state to atomic behavior. However, throughout the energy range h..nu.. = 10 to 1000 eV or higher both types of phenomena are present. Thus angle-resolved photoemission can only be understood quantitatively if each experimenter recognizes the presence of band-structure, photoelectron diffraction, and photoelectron asymmetry effects. The quest for this understanding will build some interesting brid… more
Date: August 1, 1980
Creator: Shirley, D.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Excited state electron spin coherence (ESESC) studies of triplet states in molecular solids

Description: The field of coherent spectroscopy of two-level systems is applied to the lowest triplet state of organic molecules. By neglecting the triplet sublevel not coupled by the field, it is possible to describe the remaining two levels with Feynman-Vernon-Hellwarth geometrical representation of a general two-level system. The equations of motion of the pseudomagnetization are derived after transformation to the rotating frame, as are Bloch-type equations which include phenomenological relaxation time… more
Date: February 1, 1978
Creator: Tarrasch, M.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Solid modeling research at Lawrence Livermore National Laboratory: 1982-1985

Description: The Lawrence Livermore National Laboratory has sponsored solid modeling research for the past four years to assess this new technology and to determine its potential benefits to the Nuclear Weapons Complex. We summarize here the results of five projects implemented during our effort. First, we have installed two solid modeler codes, TIPS-1 (Technical Information Processing System-1) and PADL-2 (Part and Assembly Description Language), on the Laboratory's CRAY-1 computers. Further, we have exten… more
Date: September 1, 1985
Creator: Kalibjian, J. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Enhanced ion backscattering near 180/sup 0/ scattering angles in the two-atom scattering model. [Ion scattering from solids]

Description: An analytical two-atom scattering model has been developed to treat the recent discovery of the enhancement near 180/sup 0/ of Rutherford backscattering yields from disordered solids. In contrast to conventional calculations of Rutherford backscattering that treat scattering from a single atom only (the backscattering atom), the present model includes the interaction of a second atom lying between the target surface and the backscattering atom. The projectile ion makes a glancing collision with… more
Date: August 1, 1982
Creator: Oen, O.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Nonlinear, distortive phenomena in solids: Martensitic, crack, and multiscale structures

Description: This ongoing program, from the beginning of the first three year grant 1988--1991 and now in the first year of the second phase 1991--1994, has been directed at developing both an understanding of the physics underlying structural transformations in real (alloy) materials as well as new theoretical methods which adequately describe the large (nonlinear) distortions which characterize such processes. We have had a particular interest in martensitic systems, first (1988--1991) in the equilibrium … more
Date: January 1, 1992
Creator: Krumhansl, J. A. & Sethna, J. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Problem of long-range forces in the computer simulation of condensed media

Description: Simulation (both Monte Carlo and molecular dynamical) has become a powerful tool in the study of classical systems of particles interacting with short-range pair potentials. For systems involving long-range forces (e.g., Coulombic, dipolar, hydrodynamic) it is a different story. Relating infinite-system properties to the results of computer simulation involving relatively small numbers of particles, periodically replicated, raises difficult and challenging problems. The purpose of the workshop … more
Date: July 1, 1980
Creator: Ceperely, D. (ed.)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Atom-in-jellium models

Description: The author describes in this paper the atom-in-jellium calculations he has been doing over the last ten years. He tries to emphasize reasons for doing this sort of calculations and why he devised a model which is different in some respects from others.
Date: April 26, 1985
Creator: Liberman, D.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Paraho environmental data. Part I. Process characterization. Par II. Air quality. Part III. Water quality

Description: From 1973 to 1978, Development Engineering, Inc. (DEI), a subsidiary of Paraho Development Corporation, demostrated the Paraho technology for surface oil shale retorting at Anvil Points, Colorado. A considerable amount of environmentally-related research was also conducted. This body of data represents the most comprehensive environmental data base relating to surface retorting that is currently available. In order to make this information available, the DOE Office of Environment has undertaken… more
Date: June 1, 1980
Creator: Heistand, R. N.; Atwood, R. A. & Richardson, K. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Transport of solid commodities via freight pipeline: impact assessment. Volume V. First year final report

Description: The application of freight pipeline for the movement of solid goods offers a new option in the field of transportation. This volume examines impacts and their assessments. This study has only identified the areas where truck and/or rail substitution by pipeline may have impacts. It only can be said that pipeline, if it can substitute for surface traffic without correspondingly increasing it at another location, is inherently a more environmentally compatible mode of transport. Based on data pre… more
Date: July 1, 1976
Creator: Zandi, I. & Gimm, K.K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

MESA 3-D calculations of armor penetration by projectiles with combined obliquity and yaw

Description: We introduce and briefly describe MESA, a new 3-D hydrodynamic code, developed specifically for simulations of armor and anti-armor systems. The code's current capabilities an its planned model improvements and additions are discussed. An Eulerian code using state-of-the-art numerical methods, MESA runs faster and is less affected by spurious numerical diffusion than older codes. It models hydrodynamic flow and the dynamic deformation of solid materials. It uses simple elastic-perfectly plastic… more
Date: January 1, 1989
Creator: Cagliostro, D. J.; Mandell, D. A.; Schwalbe, L. A.; Adams, T. F. & Chapyak, E. J. (Los Alamos National Lab., NM (USA))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Positron lifetimes in solids from first principles calculations

Description: We present a first principles method for calculating positron lifetimes in solids, based on self-consistent calculations using the Linear Muffin-Tin Orbital method. Local density approximations are used for both electron-electron and electron-positron interactions. Results are presented for a variety of elemental metals and vacancies to demonstrate the reliability of this approach. Theoretical calculations of positron lifetimes can be used to interpret experimental data. As an examples of this,… more
Date: August 7, 1991
Creator: Sterne, P. A.; O'Brien, J. C.; Howell, R. H. & Kaiser, J. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Analysis of anelastic relaxations controlled by a spectrum of relaxation times

Description: Anelastic studies, although they have provided an important method for investigating the mobility of point defects in solids, have often been difficult to analyze when a continuous spectra of relaxation times controls the anelastic response. This paper describes a new method for obtaining accurate estimates of relaxation time spectra by direct analysis (without prior assumptions) of the data using a nonlinear regression method. Applications to internal friction and anelastic creep results are d… more
Date: January 1, 1983
Creator: Cost, J.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Pattern formation by shock processes

Description: Shock waves in condensed media often produce and leave behind periodic patterns and textures. These patterns have been observed both in real time and in postmortem examination. In many cases the patterns can be related to analogous Pattern-forming mechanisms in classical fluid dynamics, such as the Rayleigh-Taylor and Helmholtz instabilities. In other cases, the textures arise from peculiarities in the dynamic stress state immediately behind the leading edge of the shock wave. Periodic waves in… more
Date: January 1, 1983
Creator: Shaner, J.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Storage and flow of solids. Bulletin No. 123; Vol. 53, No. 26, November 1964

Description: Information is presented on: the concepts of flowability of bulk solids and of channels and the flow-no flow postulate; equipment and procedures for testing the flow of bulk solids; and bulk flow equipment design. This information should be sufficient to enable the engineer to design storage plants and flow channels for unobstructed bulk flow. Only an outline of the theory of flow is included. (LCL)
Date: November 1, 1976
Creator: Jenike, A. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Interactions between small-polaronic particles in solids

Description: When a light particle in a solid composed of relatively heavy atoms is associated with substantial displacements of the equilibrium positions of the atoms immediately surrounding it, the composite entity may be regarded as being small polaronic. Many instances of self-trapping of electronic charge carriers, excitons and light atoms such as hydrogen are known. A significant contribution to the interaction between such particles results from interference between their atomic displacement patterns… more
Date: January 1, 1980
Creator: Emin, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Initial performance evaluation of major components in the head-end reprocessing solids handling system

Description: The General Atomic cold head-end reprocessing pilot plant has been built to demonstrate the feasibility of the proposed commercial reprocessing flowsheet, in particular its integrated operation. This integration is accomplished in part by the solids handling system, which is designed to provide transfer of material at required rates between different steps in the process and to provide the required surge capacity. The major components of the solids handling system have been tested in order to v… more
Date: September 1, 1977
Creator: Cook, E.J. & Richards, P.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Studies for geologic storage of radioactive waste in the southeast. [National waste terminal storage program; SRL]

Description: The National Waste Terminal Storage (NWTS) program was initiated to conduct the research necessary to select a site for a geologic repository for the storage of high-level, solidified radioactive waste from commercial power reactors. The program also includes the design and construction of the facility and its operation once completed. As part of this program, the Savannah River Laboratory is conducting geological research that is particularly relevant to potential repository sites in the South… more
Date: January 1, 1977
Creator: Marine, I. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen