4,838 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Configuration"  
prev Results: 25 - 48 next
open access

Accelerating Full Configuration Interaction Calculations for Nuclear Structure

Description: One of the emerging computational approaches in nuclear physics is the full configuration interaction (FCI) method for solving the many-body nuclear Hamiltonian in a sufficiently large single-particle basis space to obtain exact answers - either directly or by extrapolation. The lowest eigenvalues and correspondingeigenvectors for very large, sparse and unstructured nuclear Hamiltonian matrices are obtained and used to evaluate additional experimental quantities. These matrices pose a significa… more
Date: April 14, 2008
Creator: Yang, Chao; Sternberg, Philip; Maris, Pieter; Ng, Esmond; Sosonkina, Masha; Le, Hung Viet et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

NGNP Risk Management Database: A Model for Managing Risk

Description: To facilitate the implementation of the Risk Management Plan, the Next Generation Nuclear Plant (NGNP) Project has developed and employed an analytical software tool called the NGNP Risk Management System (RMS). A relational database developed in Microsoft® Access, the RMS provides conventional database utility including data maintenance, archiving, configuration control, and query ability. Additionally, the tool’s design provides a number of unique capabilities specifically designed to facilit… more
Date: September 1, 2009
Creator: Collins, John
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Characterization engineering status report october 1998 - december 1998

Description: Characterization Engineering (CE) continues to make progress in support of the project goal of characterizing the Hanford high-level waste tanks. Two core sampling systems were operational during this reporting period-push mode core sampling system No. 1 and rotary mode core sampling system No. 4. The availability average for core sampling systems No. 1 , No. 3 and No. 4, combined, was 45 percent, down from 79percent for the previous quarter and 58 percent for FY 1998. System No. 2 did not have… more
Date: May 13, 1999
Creator: Boger, R. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Magnetic shielding design analysis

Description: Two passive magnetic-shielding-design approaches for static external fields are reviewed. The first approach uses the shielding solutions for spheres and cylinders while the second approach requires solving Maxwell's equations. Experimental data taken at LLNL are compared with the results from these shieldings-design methods, and improvements are recommended for the second method. Design considerations are discussed here along with the importance of material gaps in the shield.
Date: December 27, 1983
Creator: Kerns, J.A.; LaPaz, A.D. & Fabyan, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Risk and Work Configuration Management as a Function of Integrated Safety Management

Description: National Security Technologies, LLC (NSTec), has established a work management program and corresponding electronic Facilities and Operations Management Information System (e-FOM) to implement Integrated Safety Management (ISM). The management of work scopes, the identification of hazards, and the establishment of implementing controls are reviewed and approved through electronic signatures. Through the execution of the program and the implementation of the electronic system, NSTec staff work w… more
Date: November 30, 2007
Creator: Lana Buehrer, Michele Kelly, Fran Lemieux, Fred Williams
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Spiral Structure in Galaxies: Analogies

Description: The vortex analogy to galactic spiral structures is considered. Caution against carrying the analogy past its region of applicability is noted; and some experiments with vorticities are mentioned. (JFP)
Date: January 1, 1976
Creator: Kirkpatrick, Ronald C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Creep of circular plates sealing an incompressible fluid

Description: Creep of a symmetrically loaded clamped circular plate sealing an incompressible fluid is analyzed using a new constitutive relation for inelastic deformation behavior of metals proposed by Hart and Li. The problems ae solved numerically for several cases at different temperatures and loading conditions. The salient features of the theory are critically examined. It is concluded that the results obtained are qualitatively similar to the results of creep reported in the literature.
Date: April 1, 1977
Creator: Chang, K. J. & Lance, R. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Patterns and instability of grannular flow

Description: Dense granular flows are often observed to become unstable and form inhomogeneous structures in nature or industry. Although recently significant advances have been made in understanding simple flows, instabilities are often not understood in detail. We present experimental and numerical results that show the formation of longitudinal stripes. These arise from instability of the uniform flowing state of granular media on a rough inclined plane. The form of the stripes depends critically on the … more
Date: January 1, 2009
Creator: Ecke, Robert E; Borzsonyi, Tamas & Mcelwaine, Jim N
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Power Flattening Studies for Radioisotope-Thermoelectric Generators

Description: "The natural exponential decay of a radioisotope used as a heat source for a thermoelectric generator makes the use of a power flattening'' device highly desirable, especially when the duration of the mission is large compared to the half-life of the radioisotope. Power-flattening devices are considered which either dump excess heat outside the thermoelectric generator or use the characteristics of the generator to absorb the excess heat and thereby regulate the hot junction temperature. A numb… more
Date: unknown
Creator: Rush, R. E. & Belofsky, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cylindrical and spherical solitons. [Soliton observation in cold single-species plasma]

Description: The recent prediction and observation of cylindrical and spherical ion acoustic solitons in a cold, single species plasma are reviewed. The properties of these higher dimensional solitons are quite different from their planar counterpart since the amplitude increases, the width decreases, and the propagation speed increases as the soliton moves inward. Although the results for two- and three-dimensional solitons are obtained numerically, early time solutions can be found analytically and compar… more
Date: June 1, 1976
Creator: Maxon, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Theoretical study of the electronic states of Nb4, Nb5 clusters and their anions (Nb4?, Nb5?)

Description: Geometries and energy separations of the various low-lying electronic states of Nb{sub n} and Nb{sub n}{sup -} (n = 4, 5) clusters with various structural arrangements have been investigated. The complete active space multi-configuration self-consistent field (CASMCSCF) method followed by multi-reference singles and doubles configuration interaction (MRSDCI) calculations that included up to 52 million configuration spin functions have been used to compute several electronic states of these clus… more
Date: May 6, 2004
Creator: Balasubramanian, K & Majumdar, D
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Transport in rectangular quadrupole channels

Description: Multiple electrostatic quadrupole arrays can be produced in many different geometries. However, the fabrication process can be considerably simplified if the poles are rectangular. This is especially true for millimeter sized channels. This paper presents the results of a series of measurements comparing the space charge limits in cylindrical and rectangular quadrupole channels.
Date: January 1, 1983
Creator: Meier, E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Measuring sphericity on a roundness gage

Description: The three-dimensional geometry of a spherical object may be determined by evaluation of a number of two-dimensional roundness measurements which have a known orientation with respect to one another. A suitable set of orientations appears to be one in which the plane of each roundness measurement coincides with every other such plane along a single diameter of the sphere. A device for producing the required set of orientations, adaptable to spheres of varying diameters and designed to avoid dama… more
Date: January 1, 1980
Creator: Gauler, A. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Effective Downwash Characteristics at Transonic Speeds of a 6-Percent-Thick Wing With 47 Degrees of Sweepback in Combination With a Cylindrical Body as Determined From Force Measurements of a Horizontal Tail

Description: Memorandum presenting the effective downwash characteristics of a wing-body configuration and the body alone determined from lift measurements of a horizontal tail located 0.333 and 0.479 wing semispan above the body center line. The wing had a sweepback angle of 47 degrees, an aspect ratio of 3.5, a taper ratio of 0.2, and a thickness ratio of 0.06.
Date: November 26, 1952
Creator: Coppolino, Domenic A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Aeolotropic Elastic Relations for Uranium Crystals

Description: Handwritten report. This theoretical introduction to the anisotropic elastic properties of the orthorombic [sic] uranium crystal presents certain basic ideas which are useful in the study of experimental methods for determining preferred orientations in polycrystalline bodies. The method of analysis used to determine the elastic constants suggests explanations and correlations for the observations of sonic wave experiments on bars having preferred orientations and also serves as an introduction… more
Date: December 17, 1954
Creator: Merckx, K. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Some properties of capillary surfaces on elliptical domains

Description: It is shown that there will exist a critical contact angle for an elliptical cross section if the ratio b/a of the minor and major semiaxes is less than 0.6116. (There is no solution of the capillary suface equations for contact angles less than the critical angle.) A lower bound on ..gamma../sub crit/ is calculated for various values of b/a. These bounds appear to be close to the values of ..gamma../sub crit/ found by numerical solution of the capillary surface equations.
Date: July 1, 1977
Creator: Albright, N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Developing flow and heat transfer in strongly curved ducts of rectangular cross-section

Description: A numerical study of heat transfer in 90/sup 0/, constant cross-section curved duct, steady, laminar flow is presented. The work is aimed primarily at characterizing the effects of duct geometry on heat transfer by considering, especially, the role of secondary motions during the developing period of the flow. However, due consideration has also been given to varying initial conditions of velocity and temperature at the entrance section to the duct. In addition, an assessment is made of the rel… more
Date: April 1, 1979
Creator: Yee, G. & Humphrey, J.A.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen