Search Results

open access

Time and Frequency: Theory and Fundamentals

Description: From Abstract: "This is a tutorial Monograph describing various aspects of time and frequency (T/F). Included are chapters relating to elemental concepts of precise time and frequency; basic principles of quartz oscillators and atomic frequency standards; historical review, recent progress, and current status of atomic frequency standards; promising areas for developing future primary frequency standards; relevance of frequency standards to other areas of metrology including a unified standard concept; statistics of T/F data analysis coupled with the theory and construction of the NBS atomic time scale; an overview of T/F dissemination techniques; and the standards of T/F in the USA. The Monograph addresses both the specialist in the field as well as those desiring basic information about time and frequency."
Date: May 1974
Creator: Blair, Byron E.
Partner: UNT Libraries Government Documents Department
open access

Bibliography and Index on Vacuum and Low Pressure Measurement, January 1960 to December 1965

Description: From Abstract: "The bibliography, a supplement to NBS Monograph 35, of the same title, covers the years 1960 to 1965, inclusive, and include 109 references for prior years not listed in Monograph 35. It contains 1787 references, 38 of which are to books. The references, besides those directly concerned with pressure measurement, include those on vacuum technology which may bear on the technique of vacuum measurement, such as on adsorption and desorption, diffusion of gases into solids, gas conductance and hardware such as pumps, seals and traps."
Date: May 31, 1967
Creator: Brombacher, W. G.
Partner: UNT Libraries Government Documents Department
open access

Mercury Barometers and Manometers

Description: From Abstract: "Sources of error in measuring pressures are described in considerable detail, particularly for portable instruments including scale, temperature , gravity, capillarity, vacuum errors and return gas column. Methods of minimizing those errors and of making the corrections, including extensive tables, are presented."
Date: May 20, 1960
Creator: Brombacher, W. G.; Johnson, D. P. & Cross, J. L.
Partner: UNT Libraries Government Documents Department
open access

Temperature Measurements in Bessemer and Open-Hearth Practice

Description: Technical paper issued by the Bureau of Standards over studies conducted on different types of furnaces, specifically the Bessemer and the open-hearth furnace. The results of the studies are presented and discussed. This paper includes tables, and illustrations.
Date: May 8, 1917
Creator: Burgess, George K.
Partner: UNT Libraries Government Documents Department
open access

Table of wavenumbers: Volume 1, 2000 A to 7000 A

Description: From Extension of Tables: "Because of its range and size, this table of wavenumbers is in two volumes, Volume I presenting wavenumbers for all wavelengths between 2000 and 7000 A, and Volume II giving wave-numbers for all wavelengths from 7000 A to 10000000 A=1 mm. In some cases Volume I may suffice for ionic spectra, and in others Volume II may be adequate for molecular spectra, but in general both volumes will needed to cover the entire range of spectral wavelengths measured in standard air."
Date: May 2, 1960
Creator: Coleman, Charles DeWitt; Bozman, William R. & Meggers, William F.
Partner: UNT Libraries Government Documents Department
open access

Table of Wavenumbers: Volume 2, 7000 A to 1000 mu

Description: Report discussing "A two-volume table for converting wavelengths in standard air to wavenumbers in vacuum. Wave-numbers are given to the nearest 0.001 K (cm^-1) for wavelengths from 2000 to 7000 A in volume 1, and 7000 A to 1000 m in volume II."
Date: May 16, 1960
Creator: Coleman, Charles DeWitt; Bozman, William R. & Meggers, William F.
Partner: UNT Libraries Government Documents Department
open access

The Development and Evaluation of Effective Symbol Signs

Description: Report issued by the National Bureau of Standards over the history and development of sign systems in the United States. The research and development of more effective systems are discussed. This report includes tables, and illustrations.
Date: May 1982
Creator: Collins, Belinda Lowenhaupt
Partner: UNT Libraries Government Documents Department
open access

Thermal Expansion of Technical Solids at Low Temperatures: A Compilation From the Literature

Description: Report giving tables of the linear contraction relative to 293 ºK, (L293ºLT)/L293, and the linear expansion coefficient, dL/L293dT, of thirty elements, forty-five alloys, twenty-two other inorganic substances and twenty plastics and elastomers in the temperature range, 0 to 300 ºK.
Date: May 19, 1961
Creator: Corruccini, Robert J. & Gniewek, John J.
Partner: UNT Libraries Government Documents Department
open access

Steel Research Needs for Buildings

Description: Abstract: This report identifies experimental and analytical research needed to advance the state-of-the-art and improve safety and economy in the design, fabrication and construction of steel buildings. A five year plan for a coordinated research program is included. Recommendations for research projects dealing with the following topics are presented: total building systems, connections and members, frames, seismic design, load and resistance factor design, fire protection, and design loads. The recommendations were developed at a workshop involving participation by steel industry representatives, design professionals, Federal agency representatives and university researchers.
Date: May 1985
Creator: Culver, Charles G.; Iwankiw, Nestor & Kuentz, Albert
Partner: UNT Libraries Government Documents Department
open access

Space Groups and Lattice Complexes

Description: From Abstract: "The lattice complex is to the space group what the site is to the point group - an assemblage of symmetry-related equivalent points. The Tables list site sets and lattice complexes in standard and alternate representation. The higher the symmetry of the crystal structures is, the more useful the lattice-complex approach should be on the road to the ultimate goal their classification."
Date: May 1973
Creator: Fisher, Werner; Burzlaff, Hans; Hellner, Erwin & Donnay, J. D. H.
Partner: UNT Libraries Government Documents Department
open access

Linear Gain: Standard Antennas Below 1000 MHz

Description: Abstract: Gain and antenna parameters related to input impedance are calculated using a computer program called HVD6. This program uses well documented equations to compute these parameters for gain-standard antennas used in relative-gain or gain-transfer measurements at frequencies below 1000 MHz. The utility of this program is that it calculates gain patterns and input impedances for linear dipoles above perfect or imperfectly conducting plane ground and in free space, and for monopoles on perfectly conducting plane ground. Examples are included to illustrate the use of the program. Uncertainties in the calculated parameters are estimated to be less than those of the measured parameters.
Date: May 1986
Creator: FitzGerrell, R. G.
Partner: UNT Libraries Government Documents Department
open access

A Statistical Characterization of Electroexplosive Devices Relevant to Electromagnetic Compatibility Assessment

Description: Abstract: Electroexplosive devices (EEDs) are electrically fired explosive initiators used in a wide variety of applications. The nature of most of these applications requires that the devices function with near certainty when required and remain inactive otherwise. Recent concern with pulsed electromagnetic interference (EMI) and nuclear electromagnetic pulse (EMP) made apparent the lack of methodology for assessing EED vulnerability. A new and rigorous approach for characterizing EED firing levels is developed in the context of statistical linear models and is demonstrated in this paper. We combine statistical theory and methodology with thermodynamic modeling to determine the probability that an EED, of a particular type, fires when excited by a pulse of a given width and amplitude. The results can be applied to any type of EED for which the hot-wire explosive binder does not melt below the firing temperature. Included are methods.for assessing model validity and for obtaining probability plots, called "Firing Likelihood Plots". A method of measuring the thermal time constant of an EED is given. This parameter is necessary to evaluate the effect of a train of pulses. These statistical methods are both more general and more efficient than previous methods for EED assessment. The results provide information which is crucial for evaluating the effects of currents induced by impulsive electromagnetic fields of short duration relative to the EEDs thermal time constant.
Date: May 1986
Creator: Friday, Dennis S. & Adams, John W.
Partner: UNT Libraries Government Documents Department
open access

Oil and Gas Supply Modeling

Description: Abstract: The symposium on Oil and Gas Supply Modeling, held at the Department of Commerce, Washington, DC (June 18-20, 1980), was funded by the Energy Information Administration of the Department of Energy and co-sponsored by the National Bureau of Standards' Operations Research Division. The symposium was organized to be a forum in which the theoretical and applied state-of-the-art of oil and gas supply models could be presented and discussed. Speakers addressed the following areas: the realities of oil and gas supply, prediction of oil and gas production, problems in oil and gas modeling, resource appraisal procedures, forecasting field size and production, investment and production strategies, estimating cost and production schedules for undiscovered fields production regulations, resource data, sensitivity analysis of forecasts, econometric analysis of resource depletion, oil and gas finding rates, and various models of oil and gas supply. This volume documents the proceedings (papers and discussion) of the symposium.
Date: May 1982
Creator: Gass, Saul I.
Partner: UNT Libraries Government Documents Department
open access

A Bibliography of Sources of Thermodynamic Data for the Systems: CO₂+NH₃+H₂O, CO₂+H₂S+H₂O, H₂S+NH₃+H₂O, and CO₂+NH₃+H₂S+H₂O

Description: Abstract: Contained herein is a bibliography of sources of experimental and correlated thermodynamic data for the systems: CO₂ + NH₃ + H₂O, CO₂ + H₂S + H₂O, H₂S + NH₃ + H₂O, and CO₂ + NH₃ + H₂S + H₂O. The types of data in this bibliography include all types of equilibrium data, including both eqilibria [sic] in solution and vapor-liquid equilibrium data, enthalpies, heat capacities, and densities. There are 215 references cited. Bibliographic Data Sheet.
Date: May 1985
Creator: Goldberg, Robert N. & Steckler, D. K.
Partner: UNT Libraries Government Documents Department
open access

Ideal Gas Thermodynamic Functions and Isotope Exchange Functions for the Diatomic Hydrides, Deuterides, and Tritides

Description: From Abstract: "This Monograph contains a consistent set of tables of thermodynamic properties of a large number of diatomic hydrides, deuterides, and tritides, for the ideal gas state at one atmosphere pressure. In addition to the thermodynamic properties of the molecular gases, the tables also include thermodynamic properties for chemical reactions involving the isotopic exchange of hydrogen."
Date: May 29, 1961
Creator: Haar, Lester; Friedman, Abraham S. & Beckett, Charles W.
Partner: UNT Libraries Government Documents Department
open access

WR15 Microwave Calorimeter and Bolometer Unit

Description: Descriptions of the principal changes in the calorimeter and bolometer unit from the WR28 models of a microwave serving as National Bureau of Standards standard for power measurements in the frequency range 50 to 75 GHz.
Date: May 1972
Creator: Harvey, Morris E.
Partner: UNT Libraries Government Documents Department
open access

Design for Better Window Performance

Description: Matrix diagram for design and construction of windows for energy conservation in buildings.
Date: May 1980
Creator: Hastings, S. Robert & Driscoll, Porter
Partner: UNT Libraries Government Documents Department
open access

Endurance Tests of Tires

Description: Technical paper issued by the Bureau of Standards over studies conducted on the endurance of tires. 230 tires of 36 different brands were tested during the studies. The results of the studies are presented and discussed. This paper includes tables, and photographs.
Date: May 25, 1926
Creator: Holt, W. L. & Wormeley, P. L.
Partner: UNT Libraries Government Documents Department
open access

Science and Technology: the Challenges of the Future

Description: Preface: On its 80th anniversary, the National Bureau of Standards hosted a series of lectures by six distinguished speakers of national and international note who discussed the challenges facing science and technology and, thus, the Bureau in the coming years. This publication contains the texts of these presentations, along with transcripts of the question-and answer sessions following the presentations. The lecture series was organized by Dr. Donald R. Johnson of NBS with the very able assistance of Mrs. Carol Shipley in making arrangements for speakers and handling the manuscripts. The staff of the NML Text Editing Facility are acknowledged for their substantial contributions of typing and editing support.
Date: May 1982
Creator: Johnson, Donald R.
Partner: UNT Libraries Government Documents Department
open access

Calibration of Line Standards of Length and Measuring Tapes at the National Bureau of Standards

Description: From Abstract: "The methods used at the National Bureau of Standards in calibrating line standards of length and measuring tapes submitted for standardization are outlined. The equipment used is described briefly. There is a discussion of some considerations that should be given as to whether or not a standard should be submitted to the Bureau."
Date: May 20, 1960
Creator: Judson, Lewis V.
Partner: UNT Libraries Government Documents Department
open access

Investigation of the Kansas City Hyatt Regency Walkways Collapse

Description: Report issued by the National Bureau of Standards documenting investigations conducted on construction failures of two suspended walkways in a Kansas City hotel. It includes tables, illustrations, photographs, and other details of the investigation.
Date: May 1982
Creator: Marshall, Richard D.; Pfrang, E. O.; Leyendecker, Edgar V.; Woodward, K. A.; Reed, R. P.; Kasen, M. B. et al.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen