DATAPLOT: Introduction and Overview (open access)

DATAPLOT: Introduction and Overview

Abstract: This manual provides DATAPLOT code solution to a variety of commonly occurring graphical problems. A line-by-line explanation of code is given, along with illustrations and general discussion.
Date: June 1984
Creator: Filliben, James J.
System: The UNT Digital Library
Standards Committee Activities of the National Bureau of Standards: 1983 Highlights (open access)

Standards Committee Activities of the National Bureau of Standards: 1983 Highlights

Abstract: This report summarizes NBS standards committee activities and accomplishments during calendar year 1983. It profiles NBS state participation on outside standards committees and highlights significant technical and individual contributions made by NBS staff. In 1983, 446 staff members (or 28% of NBS' professionals, scientific, and technical staff) participated in 989 standards committees of 87 national and international standards organizations.
Date: April 1984
Creator: Newell, Karl G., Jr.
System: The UNT Digital Library
Facilities of the National Bureau of Standards (open access)

Facilities of the National Bureau of Standards

From forward: Every laboratory in this country is a valuable national resource. Along with the people who work in these facilities, U.S. laboratories constitute the basic foundation of this country's scientific and industrial strength. As the nation's foremost science and engineering measurement laboratory, the National Bureau of Standards has some of the premier research and testing facilities in the United States, and several of our laboratories are unequaled anywhere in the world. Bureau scientists and engineers use these special facilities to pursue the measurement-related work that U.S. science and industry need to grow and prosper. This brochure highlights only a small number of the special facilities available at NBS and provides information about their availability for collaborative or independent research and testing.
Date: December 19, 1984
Creator: United States. National Bureau of Standards.
System: The UNT Digital Library
Compiled Thermodynamic Data Sources for Aqueous and Biochemical Systems: an Annotated Bibliography (1930-1983) (open access)

Compiled Thermodynamic Data Sources for Aqueous and Biochemical Systems: an Annotated Bibliography (1930-1983)

Abstract: This is a selected and annotated bibliography of sources of compiled and evaluated chemical thermodynamic data relevant to biochemical and aqueous systems. The principal thermodynamic properties considered herein are Gibbs energy and equilibrium data, enthalpies of formation and reaction, heat capacities and entropies, and the corresponding partial molar and excess properties. Derived quantities used in calculating the above are also included. Transport and mechanical data have also been identified to a lesser degree. Included in the annotations to the data sources are brief descriptions of the types of properties tabulated, the classes of materials dealt with, and the degree of completeness of the compilations.
Date: December 1984
Creator: Goldberg, Robert N.
System: The UNT Digital Library
State Measurement Laboratories (open access)

State Measurement Laboratories

Abstract: The National Bureau of Standards receives repeated requests from industry and Federal agencies (e.g. , Department of Defense, Nuclear Regulatory Commission) for information about the capabilities of and services provided by State measurement laboratories. This directory is a compilation of such information by State, including a description of the services available and fees charged. The directory will be updated annually in January of each year to coincide with the issuance of annual certification of these laboratories.
Date: November 1984
Creator: Oppermann, H. V.
System: The UNT Digital Library
Proceedings of the Second International Conference on Precision Measurement and Fundamental Constants, June 8-12, 1981 (open access)

Proceedings of the Second International Conference on Precision Measurement and Fundamental Constants, June 8-12, 1981

Abstract: This volume presents the Proceedings of the Second International Conference on Precision Measurement and Fundamental Constants, held at the National Bureau of Standards in Gaithersburg, MD, from June 8-12, 1981. Like its 1970 predecessor, the Conference provided an international forum for theoretical, experimental, and applied scientists actively engaged in research on precision measurements relating to the fundamental physical constants, and on the testing of related fundamental theory. More specifically, the purpose of the Conference was to assess the present state of the precision measurement-fundamental constants field, to examine basic limitations, and to explore the prospects for future significant advances. The principal subjects covered were: frequency, wavelength, spectroscopy, quantum electrodynamics, the gas constant, x-ray interferometry, nuclidic masses, uncertainty assignment, gravitational acceleration, mass, electrical quantities, gravity, and relativity. These proceedings contain the vast majority of both the invited review papers and the contributed current research papers presented at the Conference. The new results reported at the Conference were considered for inclusion in the 1983 least-squares adjustment of the constants carried out under the auspices of the Task Group on Fundamental Constants of the Committee on Data for Science and Technology (CODATA).
Date: August 1984
Creator: Taylor, B. N. & Phillips, William D.
System: The UNT Digital Library
An Error Analysis for the Use of Presently Available Lunar Radio Flux Data in Broadbeam Antenna-System Measurements (open access)

An Error Analysis for the Use of Presently Available Lunar Radio Flux Data in Broadbeam Antenna-System Measurements

From introduction: Simple, precise expressions for lunar diameter, average brightness temperature, flux density, and shape factor are presented. An analysis of the relationship between these parameters and corresponding errors are included. For broadbeam (HPBW>d) antennas, results show that flux density and shape factor can be determined with errors less than 13 percent and 0.4 percent respectively at frequencies below 10 GHz. Extension of the analysis to higher frequencies is indicated.
Date: February 1984
Creator: Daywitt, William C.
System: The UNT Digital Library
A Coaxial Noise Standard for the 1 GHz to 12.4 GHz Frequency Range (open access)

A Coaxial Noise Standard for the 1 GHz to 12.4 GHz Frequency Range

From introduction: This note describes the design and construction of a coaxial thermal noise standard. The standard is designed to operate at the boiling point of liquid nitrogen with a noise temperature accurate to t 1 K in the frequency range from 1 GHz to 12.4 GHz.
Date: 1984
Creator: Daywitt, William C.
System: The UNT Digital Library
Theory of Near-Field Phased Arrays for Electromagnetic Susceptibility Testing (open access)

Theory of Near-Field Phased Arrays for Electromagnetic Susceptibility Testing

From introduction: The feasibility of using a near-field array for electromagnetic susceptibility testing is studied. The basic objective is to control the element weightings such that a plane wave is generated within the test volume. The basic theory is developed for arbitrary array geometries, and numerical results are obtained for finite planar arrays. A general near-field array synthesis technique is developed, and the technique minimizes the mean square error in the test volume while constraining the array excitations. The constraint prevents large excitations and is useful in minimizing the fields outside the test volume. The basic idea looks promising, but some practical considerations, such as bandwidth and angular scanning limitations, require further theoretical and experimental investigation.
Date: February 1984
Creator: Hill, D. A.
System: The UNT Digital Library
Electromagnetic-Acoustic-Transducer/Synthetic-Aperture System for Thick-Weld Inspection (open access)

Electromagnetic-Acoustic-Transducer/Synthetic-Aperture System for Thick-Weld Inspection

Abstract: This report describes a system based on electromagnetic-acoustic transducers (EMATs) as an approach to automated nondestructive evaluation of thick weldments (>25 mm). Good signal-to-noise ratios, often a problem with EMATs, were possibTe through careful design of the transducers and associated electronic circuits and the use of signal averaging. At 454 kHz, the transducers produce shear-horizontal waves of approximately 7-mm wavelength in steel. The long wavelength permits determination of through-thickness flaw depth from the amplitudes of scattered ultrasonic waves. A minicomputer controlled transducer positioning and acquired the digitized ultrasonic waveforms for synthetic aperture processing. The synthetic aperture technique further improved signal quality and yielded flaw localization through the weld thickness. Measurements on artificial flaws demonstrated a detectability threshold of 0.5 mm (through thickness) and sizing ability up to 2.5 mm, in agreement with theoretical predictions. Details include the design of the transducers and electronics, as well as the mechanical positioner, signal processing algorithms, and complete computer program listing.
Date: 1984
Creator: Fortunko, C. M.; Schramm, R. E.; Moulder, J. C. & McColskey, J. D.
System: The UNT Digital Library
Small Aperture Analysis of the Dual TEM Cell and an Investigation of Test Object Scattering in a Single TEM Cell (open access)

Small Aperture Analysis of the Dual TEM Cell and an Investigation of Test Object Scattering in a Single TEM Cell

Introduction: Small aperture theory is used to investigate the dual TEM cell. Analyzing coupling through an empty versus a loaded aperture leads to a model of dual TEM cell shielding effectiveness measurements. Small obstacle scattering yields results for both the field perturbation and the change in a cell's transmission line characteristics due to the presence of a test object in a TEM cell. In each case, theoretical values are compared to experimental data.
Date: 1984
Creator: Wilson, Perry F. & Ma, Mark T.
System: The UNT Digital Library
Calibration of Temperature Measurement Systems Installed in Buildings (open access)

Calibration of Temperature Measurement Systems Installed in Buildings

Report issued by the National Bureau of Standards over calibration of thermometers for accurate temperature measurements in buildings. Methods of on-site calibration are discussed. This report includes graphs, and illustrations.
Date: January 1984
Creator: Hurley, C. Warren & Schooley, James F.
System: The UNT Digital Library
On-Site Calibration of Flow Metering Systems Installed in Buildings (open access)

On-Site Calibration of Flow Metering Systems Installed in Buildings

Report issued by the National Bureau of Standards over calibration of flow-metering systems. Methods for on-site calibration are discussed. This report includes illustrations.
Date: January 1984
Creator: Baker, David W. & Hurley, C. Warren
System: The UNT Digital Library
Directional Extreme Wind Speed Data for the Design of Buildings and Other Structures (open access)

Directional Extreme Wind Speed Data for the Design of Buildings and Other Structures

Report issued by the National Bureau of Standards over wind speed data collected for the design of buildings. The wind speed data is discussed. This report includes tables.
Date: March 1984
Creator: Changery, Michael J.; Dumitriu-Valcea, Eugene J. & Simiu, Emil
System: The UNT Digital Library
Effectiveness of Solar Shading for an Office Building (open access)

Effectiveness of Solar Shading for an Office Building

Report issued by the National Bureau of Standards over the effectiveness of solar screens on office buildings. The effectiveness of solar shading is discussed. This report includes tables, maps, illustrations, and photographs.
Date: May 1984
Creator: Treado, S.; Barnett, J. & Remmert, W.
System: The UNT Digital Library
Ring-On-Ring Tests and Load Capacity of Cladding Glass (open access)

Ring-On-Ring Tests and Load Capacity of Cladding Glass

Report issued by the National Bureau of Standards over studies conducted on the load capacity of cladding glass. Testing methods are discussed. This report includes tables, photographs, and illustrations.
Date: August 1984
Creator: Simiu, Emil; Reed, Dorothy A.; Yancey, Charles W. C.; Martin, Jonathan W.; Hendrickson, Erik M.; Gonzalez, Armando C. et al.
System: The UNT Digital Library
Potential Energy Savings in Residential Oil-Fired Heating Systems in the United States (open access)

Potential Energy Savings in Residential Oil-Fired Heating Systems in the United States

Report issued by the National Bureau of Standards over studies conducted on the potential energy savings of residential heating systems. The results of oil-fired heating systems are discussed. This report includes tables, graphs, and illustrations.
Date: December 1984
Creator: Kelly, George E.; Didion, David A.; Quigley, D. & Collins, B.
System: The UNT Digital Library