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The Effect of Time Ordering on the Lyman α Profile
Report investigating the effects of time-ordering over the complete line profile using a unified theory of spectral line broadening previously developed. The behavior of the time-ordered thermal average and un-time-ordered thermal average are compared. The Fourier transform of the thermal average is obtained analytically. Calculations for the line profile of the Lyman-[functional symbol alpha] line of hydrogen are presented and are representative in that the full thermal average is replaced by the thermal average with the electron velocity distribution approximated by f(v)=[functional symbol alpha] (v-vav) where vav is the thermal velocity for the plasma in question.
Date:
June 1971
Creator:
Godfrey, J. T.; Vidal, C. R.; Smith, E. W. & Cooper, J.
Object Type:
Report
System:
The UNT Digital Library
Effective Resistance and Inductance of Iron and Bimetallic Wires
Report issued by the Bureau of Standards over the use of bimetallic wires. The resistance and inductance of the bimetallic wires are studied. This report includes tables, and illustrations.
Date:
1916
Creator:
Miller, John M.
Object Type:
Report
System:
The UNT Digital Library
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.
Object Type:
Report
System:
The UNT Digital Library
Effects of Finite Lattice Heat Capacity on Spin Lattice Relaxation: Theory and Numerical Analysis
Report discussing the transient magnetic behavior of a paramagnetic substance, after an initial disturbance, considered theoretically for a variety of situations in which the lattice temperature rises as a result of energy flow from the magnetic (electron spin) system. Next, the opposite extreme is considered - that in which the resonant and remaining modes are totally uncoupled. Finally, there is a consideration of the case of spins coupled only to the resonant phonons, which in turn are coupled to a constant temperature bath, whether this be the helium or the remaining modes.
Date:
August 1, 1967
Creator:
Peterson, Robert L.
Object Type:
Report
System:
The UNT Digital Library
Effects of Thermal Shrinkage on Built-up Roofing
From Introduction: "The object of this research was to identify and study some of the factors involved in premature failures and to relate the pertinent factors to roof performance."
Date:
March 4, 1965
Creator:
Cullen, William C.
Object Type:
Report
System:
The UNT Digital Library
Efflux of Gases Through Small Orifices
Scientific paper issued by the Bureau of Standards over studies conducted on gas effusion rates. The methods used and the results of the studies are presented and discussed. This paper includes tables, and illustrations.
Date:
January 28, 1920
Creator:
Buckingham, Edgar & Edwards, Junius David
Object Type:
Report
System:
The UNT Digital Library
An Electric and Magnetic Field Sensor for Simultaneous Electromagnetic Near-Field Measurements -- Theory
Abstract: This paper describes the theory of a single sensor to perform simultaneous electric and magnetic near-field measurements. The theory indicates that it is possible to obtain the magnetic-loop and electric-dipole currents using a loop terminated with identical loads at diametrically opposite points. The theory also indicates that it is possible to obtain an ideal load impedance for achieving equal electric and magnetic field responses of the loop. Preliminary experiments have been performed using plane waves to verify these results. Key words: electric field, electromagnetic interference, electromagnetic radiation, loop, magnetic field, near fields.
Date:
April 1983
Creator:
Kanda, Motohisa
Object Type:
Report
System:
The UNT Digital Library
The Electrical Conductivity of Commercial Copper
Report issued by the Bureau of Standards over the conductivity of copper. Samples of commercial copper were studied, and the results are presented and discussed. This report includes tables, illustrations, and photographs.
Date:
1911
Creator:
Wolff, F. A. & Dellinger, J. H.
Object Type:
Report
System:
The UNT Digital Library
Electrical Parameters of Precision, Coaxial, Air-dielectric Transmission Lines
From Introduction: "Following the guidelines established by this committee, several commercially developed precision connectors have appeared on the market which have led to the wide use of the precision coaxial lines as immittance standards. This paper has been prepared to alleviate this situation by providing graphs from which the electrical parameters of the lines may be determined rapidly and accurately."
Date:
June 30, 1966
Creator:
Nelson, Robert E. & Coryell, Marlene R.
Object Type:
Report
System:
The UNT Digital Library
Electrical Properties of Materials and Their Measurement at Low Temperatures
Abstract: A review is given of the electrical resistance of materials at cryogenic temperatures. Measurement techniques, the data base, and uses of the data are presented. The emphasis is on metals and alloys of technological importance; a toxic which covers a large range of materials. Similarly, the treatment of theory and of measurement techniques is primarily for the user interested in the more practical aspects of the subject. In every instance, however, references are given which allow the reader to pursue the subject at any level.
Date:
March 1982
Creator:
Fickett, F. R.
Object Type:
Report
System:
The UNT Digital Library
Electrolysis and its Mitigation
Technical paper issued by the Bureau of Standards over studies conducted on electrolysis. As stated in the introduction, "this investigation has included a study of the physical laws governing electrolytic and self-corrosion in soils, an extended investigation of the effects of electric currents on plain and reinforced concrete, and a study of the work of previous investigators relating to the subject of electrolysis and its prevention" (p. 5). This paper includes tables, illustrations, and photographs.
Date:
November 25, 1918
Creator:
Rosa, Edward B. & McCollum, Burton
Object Type:
Report
System:
The UNT Digital Library
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.
Object Type:
Report
System:
The UNT Digital Library
Electromagnetic Boundary-Value Problems Based Upon a Modification of Residue Calculus and Function Theoretic Techniques
From Introduction: "The first part of this monograph is concerned with the analysis of closed region wave-guide junction problems. This allows simplification of the techniques to be used since no branch cuts are involved in the spectral representation of the fields. However, the analysis can be extended to open region problems in a logical manner. This is the subject of the second part of this monograph."
Date:
June 1979
Creator:
Montgomerey, James Patrick & Chang, David C.
Object Type:
Report
System:
The UNT Digital Library
Electromagnetic Compatibility and Interference Metrology
From abstract: The material included in this report is intended for a short course on electromagnetic compatibility/interference (EMC/EMI) metrology to be offered jointly by the staff of the Fields Characterization Group (723.03) and the Interference Characterization Group (723.04) of the Electromagnetic Fields Division (723). The purpose of this short course is to present a review of some of the radiated EMC/EMI measurement methods, to which the National Bureau of Standards (NBS) at Boulder, Colorado, has made significant contributions during the past two decades.
Date:
July 1986
Creator:
Ma, Mark T. & Kanda, M.
Object Type:
Report
System:
The UNT Digital Library
Electron Optical Studies of Low-Pressure Gases
From Abstract: "This document is the final report of research carried on in the Electron Physics Section of the National Bureau of Standards during the period from February 1, 1955 to March 1962 in developing an electron optical method for the visualization of low-pressure gas flow."
Date:
August 16, 1963
Creator:
Marton, L.; Schubert, David C. & Mielczarek, S. R.
Object Type:
Report
System:
The UNT Digital Library
Endurance Tests of Tires
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.
Object Type:
Report
System:
The UNT Digital Library
Energy Dispersive X-Ray Spectrometry
Abstract: Energy-dispersive x-ray analysis with gas proportional detectors has been used widely in x-ray spectrochemical analysis. It was particularly useful in the detection of low-energy x-ray emission, before the commercial availability of the Blodgett-Langmuir pseudocrystals. With the development of solid-state x-ray detectors of high resolution, and improvement in associated electronics and computers, the interest in energy-dispersive x-ray analysis has increased enormously, to the point where it has replaced Bragg crystal diffraction spectrometry in many instances.
Date:
March 1981
Creator:
Heinrich, Kurt F. J.; Newbury, Dale E.; Myklebust, R. L. & Fiori, C. E.
Object Type:
Report
System:
The UNT Digital Library
Energy Dissipation by Fast Electrons
Report discussing the energy dissipated by fast electrons at different distances from monoenergetic electron sources, for plane perpendicular and point isotropic sources including tabulations and a summary of the theoretical methods and data utilized, and a table of spatial moments.
Date:
September 10, 1959
Creator:
Spencer, L. V.
Object Type:
Report
System:
The UNT Digital Library
Energy Measurement in the Standard Penetration Test
Report issued by the National Bureau of Standards over standard penetration testing. The history, limitations, and testing procedures are presented. This report includes tables, photographs, and illustrations.
Date:
August 1981
Creator:
Kovacs, William D.; Salomone, Lawrence A. & Yokel, Felix Y.
Object Type:
Report
System:
The UNT Digital Library
Engineering Aspects of the September 19, 1985 Mexico Earthquake
Report issued by the National Bureau of Standards over the 1985 Mexico earthquake. The rescue efforts and damage assessments are discussed. This report includes tables, maps, illustrations, and photographs.
Date:
May 1987
Creator:
Stone, William C.; Yokel, Felix Y.; Celebi, Mehmet; Hanks, Thomas & Leyendecker, Edgar V.
Object Type:
Report
System:
The UNT Digital Library
An Engineering Method for Calculating Protection Afforded by Structures Against Fallout Radiation
From Introduction: "The purpose of the paper is to discuss the assumptions and the reasoning by which the calculations described in the Engineering Manual were derived from the data in [1]. The relevant curves from [1] are given in Appendix A and the technical charts from the Engineering Manual are given in appendix B."
Date:
July 2, 1964
Creator:
Eisenhauer, Charles
Object Type:
Report
System:
The UNT Digital Library
Environmental Speciation and Monitoring Needs for Trace Metal-Containing Substances from Energy-Related Processes
Abstract: This book presents the Proceedings of the DoE/NBS Workshop on Environmental Speciation and Monitoring Needs for Trace Metal-Containing Substances from Energy-Related Processes held at the National Bureau of Standards, Gaithersburg, MD, on May 18-20, 1981. The Workshop was sponsored by the Office of Health and Environmental Research, DoE, and the Office of Recycled Materials, NBS. The volume contains refereed papers submitted by 24 invited speakers, along with substantially complete text of the discussion following the papers, edited by the Co-chairpersons. The Proceedings address three major topic areas forming the overall objective of the Workshop: (1) what are the general and specific types of metal- or metalloid-containing substances occurring in energy-related process materials such as coals, oil shales, and waste products? (2) what are the current status and future prospects of element- and compound-specific measurement methods suitable for speciation of trace (ppm, ppb) metal- and metalloid-containing substances transmitted to the environment by energy-processing or waste cycling technologies? (3) for what toxic molecular forms of speciated process effluents should biological dose-response data be generated to assure reliable environmental impact and monitoring measurements? Main questions focused, on providing assurance that the speciation methods (or their development) fit basic bioassay criteria along with …
Date:
November 1981
Creator:
Brinckman, Frederick E. & Fish, Richard H.
Object Type:
Report
System:
The UNT Digital Library
An Equation of State for Fluid Ethylene
Abstract: A thermodynamic property formulation for ethylene, developed as a part of a joint industry-government project, is presented. The formulation includes an equation of state, vapor pressure equation, and equation for the ideal gas heat capacity. The coefficients were determined by a least squares fit of selected experimental data. Comparisons of property values calculated using the equation of state with measured values are given. The equation of state is not valid in the critical region (pc + 0.3 pc for temperatures of Tc + 0.05 Tc). Errors on the order of 20 percent for derived properties and 10 percent for density may be encountered near the critical point. Tables of the thermodynamic properties of ethylene for the liquid and vapor phases for temperatures from the freezing line to 450 K with pressures to 40 MPa are presented. The equation of state and its derivative and integral functions for calculating thermodynamic properties are included. Estimates of the accuracy of calculated properties are given. A guide for use of computer programs for the calculation of thermodynamic properties of ethylene with listings of subprograms and a sample program to illustrate the use and results of the program are included.
Date:
July 1981
Creator:
McCarty, Robert D. & Jacobsen, Richard T.
Object Type:
Report
System:
The UNT Digital Library
An Equation of State for Fluid Ethylene: Erratum
Card listing corrections to several data points documented in a previous technical report, titled "An Equation of State for Fluid Ethylene."
Date:
1981
Creator:
McCarty, Robert D. & Jacobsen, Richard T.
Object Type:
Text
System:
The UNT Digital Library