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in creator/contributor: "Wu, C."

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High-resolution electron microscopy studies of Au--Ni spinodial alloys

High-resolution electron microscopy has been utilized to monitor the decomposition process in Au--Ni spinodal alloys. Individual measurements were made of lattice fringe spacings which are sensitive to composition variations at the atomic plane level. Results indicate that rather smooth and regular composition waves are obtained at an early stage of decomposition, and that later stage coarsening results in larger amplitude fluctuations. This provides direct evidence of simultaneous decompositio… more

Date: November 1, 1978

Creator: Wu, C. K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Lattice imaging and mechanical properties of a Cu--Ni--Cr spinodal alloy

A commercially important Cu-28.9 percent Ni-2.8 percent Cr alloy has been heat-treated to produce spinodal structures. Conventional transmission electron microscopy (TEM) and diffraction have been used to study the spinodally decomposed product and to measure the wavelengths in the specimens. Tensile tests were performed to measure mechanical properties of the aged samples, and the fracture surfaces were examined by scanning electron microscopy. The lattice imaging technique of high-resolution … more

Date: December 1, 1976

Creator: Wu, C. K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Study of the kinetics of the interactions of carbon monoxide and oxygen with Al-Zr surface

The interaction of CO and O/sub 2/ with clean Al-Zr (40/60 atomic percent) surfaces have been studied with Auger electron spectroscopy. The initial sticking probability of O/sub 2/ on Al-Zr was measured to be S/sub 0, O/sub 2// = 0.85. The sticking probabilities of O/sub 2/ and CO as a function of CO and O/sub 2/ contamination on a Al-Zr surface have been determined. It is found, that CO adsorption is very sensitive to O/sub 2/ contamination. The CO contamination is not effective at blocking th… more

Date: November 1, 1980

Creator: Wu, C. H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Properties of high temperature SQUIDS

A review is given of the present status of weak links and dc and rf biased SQUIDs made with high temperature superconductors. A method for producing reliable, reproducible devices using Nb/sub 3/Sn is outlined, and comments are made on directions future work should take.

Date: January 1, 1978

Creator: Falco, C.M. & Wu, C.T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Gasification of residual materials from coal liquefaction. Type III extended pilot plant evaluation of a pelletized and ground Kerr McGee mineral ash residue from SRC-I coal liquefaction process

A Type III extended pilot plant evaluation of pelletized and ground Kerr McGee mineral ash residue, which was obtained from the liquefaction of Illinois No. 6 coal at the SRC-I coal liquefaction process pilot plant at Wilsonville, Alabama, was successfully completed at Texaco's Montebello Research Laboratory (MRL). A total of 60 tons of residue was gasified during three runs which were carried out at 950 psig in the MRL High Pressure Solids Gasification Unit II gasifier. The oxygen-to-residue r… more

Date: February 1, 1984

Creator: Wu, C.M. & Robin, A.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Crude oil steam distillation in steam flooding. Final report

Steam distillation yields of sixteen crude oils from various parts of the United States have been determined at a saturated steam pressure of 200 psig. Study made to investigate the effect of steam pressure (200 to 500 psig) on steam distillation yields indicates that the maximum yields of a crude oil may be obtained at 200 psig. At a steam distillation correlation factor (V/sub w//V/sub oi/) of 15, the determined steam distillation yields range from 12 to 56% of initial oil volume for the sixt… more

Date: August 1980

Creator: Wu, C. H. & Elder, R. B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Profiling hydrogen in materials using ion beams

Over the last few years many ion beam techniques have been reported for the profiling of hydrogen in materials. Nine of these were evaluated using similar samples of hydrogen ion-implanted into silicon. When possible the samples were analyzed using two or more techniques to confirm the ion-implanted accuracy. The results of this analysis which has produced a consensus profile of H in silicon which is useful as a calibration standard are reported. The analytical techniques used have capabilities… more

Date: January 1, 1977

Creator: Ziegler, J.F.; Wu, C.P. & Williams, P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Neutron Capture Cross Section Measurement on $^{238}$Pu at DANCE

The proposed neutron capture measurement for {sup 238}Pu was carried out in Nov-Dec, 2010, using the DANCE array at LANSCE, LANL. The total beam-on-target time is about 14 days plus additional 5 days for the background measurement. The target was prepared at LLNL with the new electrplating cell capable of plating the {sup 238}Pu isotope simultaneously on both sides of the 3-{micro}m thick Ti backing foil. A total mass of 395 {micro}g with an activity of 6.8 mCi was deposited onto the area of 7 … more

Date: February 14, 2011

Creator: Chyzh, A & Wu, C Y

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The Challenge Now: Completion of the Legacy TRU Waste Mission 20 Years Early

The Department of Energy's (DOE) Waste Isolation Pilot Plant (WIPP) opened on March 26, 1999, becoming the nation's first deep geologic repository for the permanent disposal of defense generated transuranic (TRU) waste. This waste is currently retrievably stored at 27 sites across the country. Since its opening, approximately 10,000 m3 of TRU waste have been safely characterized, transported, and disposed in the WIPP. The DOE has achieved and surpassed the original goal of sending 17 waste ship… more

Date: February 25, 2003

Creator: Triay, I. & Wu, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

IMPLEMENTATION OF DEFENSE NUCLEAR FACILITY SAFETY BOARD RECOMMENDATION 2000-2 AT WIPP

The Defense Nuclear Safeties Board (DNFSB) issued Recommendation 2000-2 on March 8, 2000, concerning the degrading conditions of vital safety systems, or systems important to nuclear safety, at DOE sites across the nation. The Board recommended that the DOE take action to assess the condition of its nuclear systems to ensure continued operational readiness of vital safety systems that are important for safely accomplishing the DOE's mission. To verify the readiness of vital safety systems, a tw… more

Date: February 26, 2002

Creator: Jackson, K. & Wu, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Boson degrees of freedom in Fermion many-body systems

We discuss the application of the Composite Particle Representation and Boson-Fermion Hybrid Representation to Boson behavior in Fermion Systems. 5 references, 4 figures.

Date: January 1, 1984

Creator: Guidry, M. W.; Wu, C. L. & Feng, D. H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Application of high rate magnetron sputtering to the fabrication of A-15 compounds

High quality Nb/sub 3/Sn films have been fabricated using a recently developed magnetron sputtering process capable of deposition rates approaching 1 ..mu..m/min. at sputtering voltages less than 500 V and power levels of about 5 KW. Low sputtering voltages allow more complete thermalization at lower pressures of the material condensing on the substrate which can improve long range order. Transition temperatures of up to 18.3/sup 0/K, J/sub c/(O)'s of 15 x 10/sup 6/ A/cm/sup 2/ and Hc/sub 2/ as… more

Date: January 1, 1976

Creator: Kampwirth, R. T.; Hafstrom, J. W. & Wu, C. T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

CO adsorption on Al-Zr at room temperature

A study of CO adsorption on room temperature Al-Zr has been done using Auger electron spectroscopy and gas pressure measurements. The atomic surface composition of clean Al-Zr surfaces prepared in UHV by Ar/sup +/ sputtering, was measured as a function of CO pressure and exposure time. The adsorbed C and O have the same rate constants and surface concentrations for exposures less than 2 Langmuir. Above this exposure quasi-saturation occurs. The measured sticking probability of CO on Al-Zr is co… more

Date: October 1, 1980

Creator: Wu, C. H.; Moore, R. L. & Cohen, S. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

A coarse-grained model for PETN crystals

Using the energetic material Pentaerythritol Tetranitrate (PETN) as a specific example of molecular crystal, we describe the development of a simple coarse-graining procedure by grouping several atoms or whole functional groups into single charge-neutral beads. As compared to fully atomistic calculations the coarse-grained model speeds up simulations by more than two orders of magnitude. Yet, by adjusting only two parameters in the coarse-grained interaction, the model accurately predicts the l… more

Date: February 10, 2006

Creator: Gee, R.; Wu, C. & Maiti, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Probable maximum flood control; Yucca Mountain Site Characterization Project

This study proposes preliminary design concepts to protect the waste-handling facilities and all shaft and ramp entries to the underground from the probable maximum flood (PMF) in the current design configuration for the proposed Nevada Nuclear Waste Storage Investigation (NNWSI) repository protection provisions were furnished by the United States Bureau of Reclamation (USSR) or developed from USSR data. Proposed flood protection provisions include site grading, drainage channels, and diversion… more

Date: November 1, 1991

Creator: DeGabriele, C.E. & Wu, C.L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Bambino: A Silicon Position-Sensitive Detector System for TIGRESS

Bambino is a charge-particle detector system with the capability to provide a sufficient energy and position resolution for recoiling nuclei with Z {le} 20 for the Doppler-shift corrections necessary to maintain the {gamma}-ray resolution in TIGRESS. It consists of two annular silicon detectors having an active inner diameter of 22 mm and outer diameter of 70 mm and a thickness of 140 {micro}m. They will be placed 3 cm from the target and provide solid-angle coverage of 1.15{pi} sr. It has 24 s… more

Date: August 10, 2005

Creator: Wu, C.; Becker, J. A. & Cline, D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Dislocation Dynamics Simulations of Junctions in Hexagonal Close-Packed Crystals

The formation and strength of dislocations in the hexagonal closed packed material beryllium are studied through dislocation junctions and the critical stress required to break them. Dislocation dynamics calculations (using the code ParaDiS) of junction maps are compared to an analytical line tension approximation in order to validate our model. Results show that the two models agree very well. Also the critical shear stress necessary to break 30{sup o} - 30{sup o} and 30{sup o} - 90{sup o} dis… more

Date: December 5, 2011

Creator: Wu, C.; Aubry, S.; Chung, P. & Arsenlis, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

First-principles study of high explosive decomposition energetics

The mechanism of the gas phase unimolecular decomposition of hexahydro-1,3,5,- trinitro- 1,3,5,-triazine (RDX) has been investigated using first principles gradient corrected density functional theory. Our results show that the dominant reaction channel is the N-NO* bond rupture, which has a barrier of 34.2 kcal/mol at the B- PW9 l/cc-pVDZ level and is 18.3 kcal/mol lower than that of the concerted ring fission to three methylenenitramine molecules. In addition, we have carried out a systematic… more

Date: August 21, 1998

Creator: Wu, C J

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Bambino: A Segmented Silicon Detector System for Tigress

Bambino is a charge-particle detector system with sufficient energy and position resolutions for the differentiation between projectile-like and target-like particles and for the needed Doppler-shift corrections to the detected {gamma} rays in TIGRESS. It consists of two annular silicon detectors having an active inner diameter of 22 mm and outer diameter of 70 mm and a thickness about 150 {micro}m. They are placed 3.0 cm from the target and provide solid-angle coverage of 1.15{pi} sr. Each has… more

Date: August 17, 2006

Creator: Wu, C. Y.; Becker, J. A. & Cline, D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Nuclear Structure of Radioactive Neutron-Rich Nuclei with 4pi Detector Arrays

In-beam studies of {gamma}-ray spectroscopy of radioactive neutron-rich nuclei using the 4{pi} TIGRESS array at TRIUMF requires a ''tag'' to improve the selectivity of the detected {gamma} rays in the high {gamma}-ray background produced by radioactive beams and the need for Doppler-shift correction. We propose development of two types of large solid angle auxiliary charged particle detectors to be used in conjunction with TRIGRESS in order to provide the required tag. The initial phase of dete… more

Date: May 10, 2005

Creator: Wu, C. Y.; Becker, J. A. & Cline, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Multiple three-decision rules for 2/sup k/-factorial simple effects. Technical report No. 8

One of the problems confronted in the investigation of environmental health and in biological research more generally is the fact that organisms often respond to combinations of treatments in ways which are not predictable from the way they respond to each of these taken separately. One air pollutant may, for example, disable the respiratory tract's self cleaning mechanisms and thereby increase its sensitivity to the effects of other pollutants. It is important that laboratory experiments be ab… more

Date: March 22, 1977

Creator: Bohrer, R.; Chow, W.; Faith, R.; Joshi, V. M. & Wu, C. F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Technical basis for external dosimetry at the Waste Isolation Pilot Plant (WIPP)

The WIPP External Dosimetry Program, administered by Westinghouse Electric Corporation, Waste Isolation Division, for the US Department of Energy (DOE), provides external dosimetry support services for operations at the Waste Isolation Pilot Plant (WIPP) Site. These operations include the receipt, experimentation with, storage, and disposal of transuranic (TRU) wastes. This document describes the technical basis for the WIPP External Radiation Dosimetry Program. The purposes of this document ar… more

Date: December 31, 1993

Creator: Bradley, E. W.; Wu, C. F. & Goff, T. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

WIPP waste acceptance criteria and transportation system

The Waste Isolation Pilot Plant (WIPP), located near Carlsbad, New Mexico, USA, is a US Department of Energy (DOE) facility designed as a permanent repository for transuranic wastes in the center of a 2,000-foot-thick salt bed situated 2,150 feet underground. Construction of the facility started in 1975, under a congressional act of site selection. In 1979, demonstration of safe disposal at the WIPP was authorized by Public Law 96-164. The operational philosophy and practice at the facility are… more

Date: December 31, 1991

Creator: Wu, C. F.; Ward, T. R. & Gregory, P. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Numerical Modeling of Impact Initiation of High Explosives

We performed continuum mechanics simulations to examine the behavior of energetic materials in Ballistic Chamber Impact (BIC) experiments, using an Arbitrary Lagrangian-Eulerian code (ALE3D). Our simulations revealed that interface friction plays an important role in inducing the formation of shear bands, which result in 'hot spots' for ignition. The temperature localization during BIC impact was found to be significant in materials with high yield strength. In those materials, there are multip… more

Date: May 31, 2006

Creator: Wu, C J; Piggott, T; Yoh, J & Reaugh, J

Item Type: Report

Partner: UNT Libraries Government Documents Department