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Automatic Indexing: A State-of-the-Art Report
Report presenting a state-of-the-art survey of automatic indexing systems and experiments. It was conducted by the Research Information Center and Advisory Service on Information Processing, Information Technology Division, Institute for Applied Technology, National Bureau of Standards. Consideration is first given to indexes compiled by or with the aid of machines, including citation indexes. Advantages, disadvantages, and possibilities for modification and improvement are discussed. Experiments in automatic assignment indexing are summarized. Related research efforts in such areas as automatic classification and categorization, computer use of thesauri, statistical association techniques, and linguistic data processing are described. A major question is that of evaluation, particularly in view of evidence of human inter-indexer inconsistency. It is concluded that indexes based on words extracted from text are practical for many purposes today.
Date:
March 30, 1965
Creator:
Stevens, Mary Elizabeth
Object Type:
Report
System:
The UNT Digital Library
Publications Received in the Library of the National Bureau of Standards, July 1962
Report providing an alphabetical listing of the periodicals, both American and foreign, that are currently being received in the Washington (D.C.) Library of the National Bureau of Standards. Approximately 2,000 titles are cited, together with call numbers indicating the location of each in the NBS Washington Library. Although this information was compiled primarily for the use of the Bureau's scientific staff, it is also of value to libraries, scientific and technical organizations, and research workers.
Date:
November 23, 1962
Creator:
Hopper, Natalie J.
Object Type:
Report
System:
The UNT Digital Library
Influence of a Sector Ground Screen on the Field of a Vertical Antenna
Report show the field of a short vertical antenna on a homogeneous ground is modified by the presence of a metallic screen. The screen is taken in the form of a circular disk and a concentric sector. The modification of the field is expressed in the form of surface integrals over the disk and the sector. Extensive numerical results for these basic integrals are given and a number of applications are illustrated.
Date:
April 15, 1963
Creator:
Wait, James R. & Walters, Lillie C.
Object Type:
Report
System:
The UNT Digital Library
Tensile and Impact Properties of Selected Materials From 20 to 300 ºK
Report giving the tensile and impact properties of structural materials that were experimentally determined at temperatures from 20 to 300 ºK. Tensile properties of a few materials were also determined at 4 ºK. The properties experimentally determined were the yield strength, tensile strength, elongation, and reduction of area, the stress versus strain curve, and the impact energy. The test equipment and procedures are described. The individual data are presented in tables, and the average results are displayed in graphs.
Date:
June 28, 1963
Creator:
Warren, K. A. & Reed, R. P.
Object Type:
Report
System:
The UNT Digital Library
The Calculation of Rotational Energy Levels and Rotational Line Intensities in Diatomic Molecules
Report describing procedures for making quantum mechanical calculations of rotational energy levels and rotational line intensities in diatomic molecules. The procedures are illustrated by sample calculations. A familiarity with the material of this report should enable a practicing electronic spectroscropist to carry out, though in a rather mechanical way, his own theoretical calculations for molecules under experimental investigation.
Date:
June 1970
Creator:
Hougen, Jon T.
Object Type:
Report
System:
The UNT Digital Library
Hydrogen Stark Broadening Calculations With the Unified Classical Path Theory
Report discussing the case of upper and lower state interaction introduced by a unified theory using a more compact tetradic notation. The general result is then applied to the Stark broadening of hydrogen. The thermal average of the time development operator for upper and lower state interaction is presented. A simple technique for evaluating the Fourier transform of the thermal average has been developed. The final calculations based on the unified theory and on the one-electron theory are compared with measurements in the high and low electron density regime.
Date:
May 1970
Creator:
Vidal, C. R.; Cooper, J. & Smith, E. W.
Object Type:
Report
System:
The UNT Digital Library
Photonuclear Reactions
Report discussing photonuclear reactions in the approximate energy range 10 to 30 MeV. Various sum rules are discussed and applied to experimental data. Several different theories are described and their predictions compared with experiment, and as often as possible open questions and discrepancies are pointed out.
Date:
August 1970
Creator:
Hayward, Evans
Object Type:
Report
System:
The UNT Digital Library
Infrared Spectroscopy of Carbohydrates: A Review of the Literature
Report presenting of survey of the literature on the infrared spectroscopy of carbohydrates in order to assemble and systematize information in this field. Discusses principles and instrumentation, sampling techniques, comparison of samples, and the interpretation of the spectra. In addition, examples are discussed of the use of infrared spectra for qualitative and quantitative purposes and in the determination of structure. Special techniques are briefly described.
Date:
June 1968
Creator:
Tipson, R. Stuart
Object Type:
Report
System:
The UNT Digital Library
An Introduction to the Description and Evaluation of Microwave Systems Using Terminal Invariant Parameters
Report presenting the technical background and basis for a new method of evaluating certain performance parameters which are common to all microwave systems. A unique feature of the new measurement concept is its elimination of the precision waveguide and connector requirements for an important class of measurement problems.
Date:
October 1969
Creator:
Engen, Glenn F.
Object Type:
Report
System:
The UNT Digital Library
Survey of Micromanometers
This survey is concerned with instrumentation for measuring pressures from about 0.001 to 50mm of mercury (0.13 to 6650 Nm-2), described in publications during the years 1900-1968. U-tube micromanometers and diaphragm-capacitance gages are treated in considerable detail. Other instrumentation described includes gas column manometers; elastic element micromanometers with optical, inductance, resistance wire, strain gage, and vacuum tube transducers; piston gages; vane gages; and centrifugal micromanometers. The measurement of dynamic pressure, atmospheric pressure oscillations, low vapor pressure, and calibration techniques are discussed. Schematic diagrams of approximately 70 instruments are included. References to the sources of information and available performance data are given.
Date:
1970
Creator:
Brombacher, W. G.
Object Type:
Report
System:
The UNT Digital Library
Thermocouple Reference Tables Based on the IPTS-68: Reference Tables in Degrees Fahrenheit for Thermoelements versus Platinum (Pt-67)
Report presenting tables as a supplement to those given in NBS Monograph 125. Tables were calculated from the power series expansions presented in that Monograph. They are based upon the absolute electrical units and the International Practical Temperature Scale of 1968 (IPTS-68). Reference tables for several thermoelements versus platinum (Pt-67) are given with values of the thermoelectric voltage as a function of temperature in degrees Fahrenheit. Only tables for standard letter-designated thermoelements are included.
Date:
March 1975
Creator:
Powell, Robert L. & Burns, George W.
Object Type:
Report
System:
The UNT Digital Library
Mass and Mass Values
Report discussing the different bases for determining mass values and instances where these differences may be crucial. The first part is a historical summary of weighing, standards, and the assignment of value; and the interfacing of mass measurements with civilization. The second part discusses in detail the methods of assigning mass values. Ways to convert from values on one basis to values on another basis are discussed.
Date:
January 1974
Creator:
Pontius, Paul E.
Object Type:
Report
System:
The UNT Digital Library
A High-Dispersion Spectral Analysis of the Ba II Star HD 204075 (ζ Capricorni)
Report discussing a double differential curve of growth analysis for the Ba II star S Capricorni. Both the sun and � Virginis (G9 II-III) were used as comparison stars. The observational material consists of equivalent widths, central depths, and half-widths for 1100 spectral lines measured on direct-intensity tracings of plates obtained by J. L. Greenstein at the coude focus of the 200-in telescope. The plates cover the spectral regions 3880-4825 A and 5100-6720 A at reciprocal dispersions of 2.3 and 3.4 A/mm, respectively. Atmospheric abundances have been derived for 37 elements.
Date:
March 1971
Creator:
Tech, Jack L.
Object Type:
Report
System:
The UNT Digital Library
Unified Theory Calculations of Stark Broadened Hydrogen Lines Including Lower State Interactions
Report on calculations of hydrogen Stark broadening on the basis of the unified classical path theory which has been extended to include lower state interactions in the final line profile. A detailed comparison with experiments in the density range 10-13-10-17 cm-3 is given.
Date:
January 1971
Creator:
Vidal, C. R.; Cooper, J. & Smith, E. W.
Object Type:
Report
System:
The UNT Digital Library
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
Reference Tables for Low-Temperature Thermocouples
Report discussing the completed experimental program of the low-temperature reference tables for the commonly used thermocouples. Details of the experimental system, instrumentation, data analysis, error analysis, and materials tested are given in order to allow the user to better evaluate and apply the results.
Date:
June 1972
Creator:
Sparks, Larry L.; Powell, Robert L. & Hall, William J.
Object Type:
Report
System:
The UNT Digital Library
Bibliography on Molecular and Crystal Structure Models
Report that briefly describes many of the models of crystal and molecular structures which have appeared in the literature, and presents a bibliography of the publications, grouped according to model types, which describe the models in more detail.
Date:
May 20, 1960
Creator:
Smith, Deane K.
Object Type:
Report
System:
The UNT Digital Library
Performance of the Norris Cotton Federal Office Building for the First 3 Years of Operation
Report issued by the National Bureau of Standards over use of the Norris Cotton Federal Building. The report focuses on the energy conservation features of the building. This report includes tables, illustrations, and photographs.
Date:
August 1981
Creator:
Hill, James Edward; May, William B., Jr.; Richtmyer, Thomas E.; Elder, Jacqueline; Tibbott, Robert L.; Yonemura, Gary T. et al.
Object Type:
Report
System:
The UNT Digital Library
Determining Cost-Effective Insulation Levels for Masonry and Wood-Frame Walls in New Single-Family Housing
Report issued by the National Bureau of Standards over calculations for cost-effective insulation in single-family housing. Different calculations are made with regards to location, energy pricing, heating and cooling equipment available, and financial criteria. This report includes tables, illustrations, and photographs.
Date:
August 1981
Creator:
Petersen, Stephen R.; Barnes, Kimberly A. & Peavy, Bradley A.
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
Organization of Building Standards Systematic Techniques for Scope and Arrangement
Report issued by the National Bureau of Standards over the organization of standards for quick and reliable access. Organizational developments are discussed. This report includes illustrations, and photographs.
Date:
September 1981
Creator:
Harris, James Robert & Wright, Richard Newport
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
Thermal Behavior of Fine-Grained Soils
Report issued by the National Bureau of Standards over thermal tests conducted on soil samples. The results of the laboratory tests are discussed. This report includes tables, illustrations, photographs.
Date:
November 1982
Creator:
Salomone, Lawrence A.; Kovacs, William D. & Wechsler, Herbert
Object Type:
Report
System:
The UNT Digital Library
Low-Voltage Room Thermostat Performance
Report issued by the National Bureau of Standards over low voltage electric thermostats. Thermostat test results are discussed. This report includes illustrations, and photographs.
Date:
April 1983
Creator:
Kao, James Y.; Sushinsky, George; Didion, David A.; Mastascusa, E. J. & Chi, Joseph
Object Type:
Report
System:
The UNT Digital Library