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in publisher: "National Institute of Standards and Technology U.S."

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AC-DC Difference Calibrations

Abstract: This publication collects and summarizes the specialized information needed to operate the ac-dc difference laboratory and calibration service at NIST (Gaithersburg). It also serves as a convenient reference source for the users of this calibration service and other interested people by documenting the service and its underlying background in considerable detail. It contains the following: an annotated table of contents, a topical index, and a glossary of common ac-dc acronyms; an ove… more

Date: May 1989

Creator: Kinard, J. R.; Hastings, J. R.; Lipe, T. E. & Childers, C. B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Liquid-in-Glass Thermometer Calibration Service

Abstract: This document gives a description of the calibration of liquid-in-glass thermometers at the National Bureau of Standards. The calibration equipment and procedures used at NBS are discussed in detail. Calculations and stem-temperature corrections are shown and a discussion of the sources of error encountered in calibration and estimates of uncertainties is presented.

Date: September 1988

Creator: Wise, Jacquelyn A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Growth mechanisms and characterization of hydrogenated amorphous- silicon-alloy films

This report describes an apparatus, constructed and tested, that allows measurement of the surface morphology of as-grown hydrogenated amorphous silicon films with atomic resolution using a scanning tunneling microscope. Surface topologies of 100-[degree][Lambda]-thick intrinsic films, deposited on atomically flat, crystalline Si and GaAs, are reported. These films surfaces are relatively flat on the atomic scale, indicating fairly homogeneous, compact initial film growth. The effect of probe-t… more

Date: February 1, 1993

Creator: Gallagher, A.; Ostrom, R.; Stutzin, G. & Tanenbaum, D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Ion kinetics and thermochemistry pertinent to mass spectrometric organic speciation. Progress report, November 15, 1992--14 November 1995

Essentially all of the completed/in progress studies during the last contract period have involved the NIST HPMS unit. Three distinct areas of in-house research are recognizable: (i) determinations of binding energies and entropies for association and cluster ions, which is accomplished by measuring the temperature dependence of the appropriate equilibrium, (ii) measurement of the temperature dependence unimolecular and bimolecular rate constants, and (iii) evaluation of PA`s, HA`s, and IP`s vi… more

Date: May 1, 1998

Creator: Sieck, L.W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Measurements of the {sup 235}U(n,f) cross section in the 3 to 30 MeV neutron energy region

To improve the accuracy of the {sup 235}U(n,f) cross section, measurements have been made of this standard cross section at the target 4 facility at Los Alamos National Laboratory (LANL). The data were obtained at the 20-meter flight path of that facility. The fission reaction rate was determined with a fast parallel plate ionization chamber and the neutron fluence was measured with an annular proton recoil telescope. The measurements provide the shape of the {sup 235}U(n,f) cross section relat… more

Date: December 31, 1991

Creator: Carlson, A. D.; Wasson, O. A. & Lisowski, P. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Experimental plan to determine the performance of the Oak Ridge National Laboratory Cold Neutron Moderator. Final report, September 1, 1993--November 30, 1993

This paper outlines an experimental plan to test the thermohydraulic concept of the proposed Oak Ridge National Laboratory Cold Neutron Moderator. The goals, approach, description of the experimental apparatus, and proposed budget and duration are presented.

Date: November 10, 1993

Creator: Giarratano, Patricia J. & Siegwarth, James D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Failure modes at room and elevated temperatures. Technical report

Successful development of reliable ceramic composites will depend on an understanding of matrix cracking and damage mechanisms in these materials. Therefore, the objective of the Failure Models subtask is to investigate failure and damage mechanisms in fiber reinforced ceramic composites. Issues such as how fiber coatings, the fiber/matrix interface, residual stresses, and fiber volume fraction affect frictional stresses, fiber debonding, fiber pull-out and failure modes will be examined. The e… more

Date: April 1995

Creator: Braun, L.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Measurements of quantum electrodynamic sensitive transitions in Na-like and Cu-like ions: Final report, 1 October 1993--29 September 1994

The object of this research was to use the GDL laser at the Laboratory for Laser Energetics at the University of Rochester to measure the energies of spectral transitions that would be of importance for testing the accuracy of calculations used to predict properties of plasmas found in inertial fusion experiments as well as in tokamaks and x-ray lasers. The general method to be used for this experiment was to focus the beam from the GDL laser to a small point so as to create a laser-produced pl… more

Date: 1994

Creator: Reader, J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Measurements and Models for Hazardous Chemical and Mixed Wastes

The mixture of toxic chemicals, heavy metals, halogenated solvents and radionuclides in many DOE waste materials presents a challenging problem for separating the different species and disposing of individual contaminants. One approach for dealing with mixed wastes is to genetically engineer the radiation-resistant bacterium, Deinococcus radiodurans to survive in and detoxify DOE's mixed waste streams, and to develop process parameters for treating mixed wastes with such constructed strains. Th… more

Date: June 1999

Creator: Holcomb, Cynthia; Watts, Laurel A. & Louie, Breverly

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Novel Miniature Spectrometer for Remote Chemical Detection

A entirely new class of chemical sensors is being developed that will enable qualitative and quantitative remote, real-time, optical diagnostics of chemical species in hazardous gas, liquid, and semi-solid phases through a completely novel implementation of cavity ring-down spectroscopy. The sensor design uses a tiny, solid block (< 1cm3) of ultra-high purity optical material that is fabricated into a regular, planar polygon with a single convex facet to form a total-internal-reflection (TIR… more

Date: June 1999

Creator: Pipino, Andrew C. R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Miniature Chemical Sensor combining Molecular Recognition with Evanescent Wave Cavity Ring-Down Spectroscopy

To address the chemical sensing needs of DOE, a new class of chemical sensors is being developed that enables qualitative and quantitative, remote, real-time, optical diagnostics of chemical species in hazardous gas, liquid, and semi-solid phases by employing evanescent wave cavity ring-down spectroscopy (EW-CRDS). The feasibility and sensitivity of EW-CRDS was demonstrated previously under Project No.60231. The objective of this project is to enhance the selectivity and range of application of… more

Date: June 15, 2004

Creator: Pipino, Andrew C. R. & Meuse, Curtis W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Redox Reactions of Metalloporphyrins and their Role in Catalyzed Reduction of Carbon Dioxide

Pulse radiolysis and laser photolysis are used to study redox processes of metalloporphyrins and related complexes in order to evaluate these light absorbing molecules as sensitizers and intermediates in solar energy conversion schemes. The main thrust of the current studies is to investigate the role of reduced metalloporphyrins as intermediates in the catalyzed reduction of carbon dioxide. Studies involve cobalt and iron porphyrins, phthalocyanines, corroles, and corrins as homogeneous cataly… more

Date: September 2002

Creator: Neta, P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Miniature Chemical Sensor Combining Molecular Recognition with Evanescent Wave Cavity Ring-Down Spectroscopy

A new chemical detection technology has been realized through EMSP Projects 60231 and 73844 that addresses DOE environmental management needs. The new technology is based on a variant of the sensitive optical absorption technique, cavity ringdown spectroscopy (CRDS). Termed evanescent-wave cavity ring-down spectroscopy (EW-CRDS), the technology employs a miniature solid-state optical resonator having an extremely high Q-factor as the sensing element, where the high-Q is achieved by using ultra-… more

Date: December 31, 2004

Creator: Pipino, Andrew C. R. & Meuse, Curt W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Cryogenic Properties of Inorganic Insulation Materials for ITER Magnets: A Review

Results of a literature search on the cryogenic properties of candidate inorganic insulators for the ITER TF magnets are reported. The materials investigated include: Al{sub 2}O{sub 3}, AlN, MgO, porcelain, SiO{sub 2}, MgAl{sub 2}O{sub 4}, ZrO{sub 2}, and mica. A graphical presentation is given of mechanical, elastic, electrical, and thermal properties between 4 and 300 K. A companion report reviews the low temperature irradiation resistance of these materials.

Date: December 1994

Creator: Simon, N.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Final report: Properties of mixtures near a phase transition. February 1, 1992 - January 31, 1996

This project emphasized the study of systems near phase transitions, and included scattering experiments, computer simulation, and theory of phase transitions. The scattering involved the use of neutrons as well as optical techniques, involved both equilibrium and sheared samples, and included conventional fluids as well as gels, micelles, colloids, and dispersions. Computer simulations and theoretical studies were completed to complement and interpret the microscopic information learned from s… more

Date: November 1999

Creator: Hanley, H. J. M. & Friend, D. G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Determination of Atomic Data Pertinent to the Fusion Energy Program

We summarize progress that has been made on the determination of atomic data pertinent to the fusion energy program. Work is reported on the identification of spectral lines of impurity ions, spectroscopic data assessment and compilations, expansion and upgrade of the NIST atomic databases, collision and spectroscopy experiments with highly charged ions on EBIT, and atomic structure calculations and modeling of plasma spectra.

Date: June 11, 2013

Creator: Reader, J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Novel Miniature Spectrometer For Remote Chemical Detection

New chemical sensing technologies are critically important for addressing many of EM's priority needs as discussed in detail at http://emsp.em.doe.gov/needs. Many technology needs were addressed by this research. For example, improved detection strategies are needed for non-aqueous phase liquids (NAPL's), such as PCE (Cl2C=CCl2) and TCE (HClC=CCl2), which persist in the environment due their highly stable structures. By developing a miniature, ultra-sensitive, selective, and field-deployable de… more

Date: September 14, 2000

Creator: Pipino, Andrew C.R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Final scientific and technical report for grant DE-AI02-93ER40784: Fundamental Physics with Cold Neutrons

There have been a growing number of notable results in fundamental neutron physics, which are briefly summarized.

Date: February 7, 2013

Creator: Dewey, Maynard, S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Communicating the Future: Best Practices for Communication of Science and Technology to the Public

To advance the state of the art in science and technology communication to the public a conference was held March 6-8, 2002 at the National Institute of Standards and Technology in Gaithersburg, MD. This report of the conference proceedings includes a summary statement by the conference steering committee, transcripts or other text summarizing the remarks of conference speakers, and abstracts for 48 "best practice" communications programs selected by the steering committee through an open compe… more

Date: September 30, 2002

Creator: Porter, Gail

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Characterization of Nb3Sn Strand for ITER

We have an ongoing research program for characterization of superconductor composite strands, the principal output of which is sensitive measurements of critical current Ic over a broad range of the essential parameters: longitudinal strain ÃÂÃÂÃÂÃÂÃÂÃÂÃÂÃÂµ, temperature T, and magnetic field B. This features a new apparatus for integrated measurement of Ic(ÃÂÃÂÃÂÃÂÃÂÃÂÃÂÃÂµ,T,B) on the same, long-conductor sample without remounting.

Date: May 3, 2012

Creator: Cheggour, Najib & Goodrich, Loren F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Novel Investigation of Iron Cross Sections via Spherical Shell Transmission Measurements and Particle Transport Calculations for Material Embrittlement Studies. Quarterly Status Report 4

OAK-B135 Novel Investigation of Iron Cross Sections via Spherical Shell Transmission Measurements and Particle Transport Calculations for Material Embrittlement Studies. Quarterly Status Report 4

Date: July 2000

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Novel Investigation of Iron Cross Sections via Spherical Shell Transmission Measurements and Particle Transport Calculations for Material Embrittlement Studies. Status report

OAK-B135 Novel Investigation of Iron Cross Sections via Spherical Shell Transmission Measurements and Particle Transport Calculations for Material Embrittlement Studies. Status report

Date: September 27, 1999

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Improving measurement quality assurance for photon irradiations at Department of Energy facilities. Final technical report

For radiation-instrument calibration to be generally acceptable throughout the US, direct or indirect traceability to a primary standard is required. In most instances, one of the primary standards established at NIST is employed for this purpose. The Department of Energy Laboratory Accreditation Program (DOELAP) is an example of a program employing dosimetry based on the NIST primary photon-, beta particle- and neutron-dosimetry standards. The NIST primary dosimetry standards for bremsstrahlun… more

Date: May 1, 1996

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Novel Investigation of Iron Cross Sections via Spherical Shell Transmission Measurements and Particle Transport Calculations for Material Embrittlement Studies. Status Report

OAK-B135 Novel Investigation of Iron Cross Sections via Spherical Shell Transmission Measurements and Particle Transport Calculations for Material Embrittlement Studies. Status Report

Date: January 2000

Item Type: Report

Partner: UNT Libraries Government Documents Department