CONTENTdm Title

$An Implementation of the Fundamental Parameters Approach for Analysis of X-ray Powder Diffraction...$
An Implementation of the Fundamental Parameters Approach for Analysis of X-ray Powder Diffraction Line Profiles
Fundamental Parameters Approach; powder diffraction; Python; Standard Reference Material; X-ray line profile
This work presents an open implementation of the Fundamental Parameters Approach (FPA) models for analysis of X-ray powder diffraction line profiles. The original literature describing these models was examined and code was developed to allow for...
Journal of Research of NIST and Predecessor Publications

A complete multimode equivalent-circuit theory for electrical design
conductor current; conductor representation; conductor voltage; electromagnetic modes; impedance matrix; modal representation; multiconductor transmission line
This work presents a complete equivalent-circuit theory for lossy multimode transmission lines. Its voltages and currents are based on general linear combinations of standard normalized modal voltages and currents. The theory includes new...
Journal of Research of NIST and Predecessor Publications

Optimization Models for Scheduling of Jobs
aircraft; bin packing; heuristic; integer programming; maintenance; optimization; scheduling
This work is motivated by a particular scheduling problem that is faced by logistics centers that perform aircraft maintenance and modification. Here we concentrate on a single facility ( hangar) which is equipped with several work stations (...
Journal of Research of NIST and Predecessor Publications

Lectures on matroids
Lectures; matroids.
This work is based on a series of papers in the Transactions of the American Mathematical Society: A homotopy theorem for matroids, I and II, 88, 144-174 (1958); and Matroids and graphs, 90, 572-552 (1959). These papers set out a theory of...
Journal of Research of NIST and Predecessor Publications

A general waveguide circuit theory
characteristic impedance; circuit theory; microwave measurement; network analyzer; pseudowaves; reciprocity; reference impedance; transmission line; traveling waves; wave-guide
This work generalizes and extends the classical circuit theory of electromagnetic waveguides. Unlike the conventional theory, the present formulation applies to all waveguides composed of linear, isotropic material, even those involving lossy...
Journal of Research of NIST and Predecessor Publications

Extreme-value estimation applied to aerosol size distributions and related environmental problems
aerosol mass concentrations; aerosol size distributions; deconvolution algorithms; maximally exposed individual; particulate matter 10 micro-m
This work examines the potential connections between extreme value statistics, problems in aerosol science, and a recent technique of solving ill-posed inversion problems, called EVE (Extreme Value Estimation). EVE estimates functionals of the...
Journal of Research of NIST and Predecessor Publications

A WAVELENGTH STANDARD FOR THE NEAR INFRARED BASED ON THE REFLECTANCE OF RARE-EARTH OXIDES
dysprosium oxide; erbium oxide; holmium oxide; near infrared reflectance; rare-earth oxides; spectral bandwidths; wavelength calibration; wavelength standard.
This work describes the techniques used to prepare and analyze a reflectance wavelength standard composed of three rare-earth oxides. A mixture of dysprosium oxide (DY2O3), erbium oxide (Er2O3), and holmium oxide (Ho2O3) provides a pressed powder...
Journal of Research of NIST and Predecessor Publications

Procedures for Wavelength Calibration and Spectral Response Correction of CCD Array Spectrometers
CCD array spectrometer; fluorescence; spectral response correction; splicing procedure
This work describes a procedure for acquiring a spectrum of an analyte over an extended range of wavelengths and validating the wavelength and intensity assignments. To acquire a spectrum over an extended range of wavelengths with a spectrometer...
Journal of Research of NIST and Predecessor Publications

Continuous Ribbon Window Blinds Patent Model
This window shade model was designed by Jacob Rabinow of the National Bureau of Standards and intended to be put through the wash and restrung to avoid cleaning individual shade slats. A full scale model is on display in the Rabinow Room of the...
NIST Museum Artifacts

Modified Wheatstone Dial Bridge
This Wheatstone Dial Bridge, manufactured by Otto Wolff, was modified by the National Bureau of Standards around 1949 to include check terminals and a fine adjustment rheostat. It was used for precision resistance thermometry.
NIST Museum Artifacts

Wolff Wheatstone Bridge
This Wheatstone Bridge, manufactured by the Otto Wolff company of Berlin, Germany, was used at the National Bureau of Standards in the early 20th century to realize the standard Ohm for electrical measurements.
NIST Museum Artifacts

Hot-Wire Switchboard Ammeter
Electricity; Galvanometer; Radiometry; Electric currents
This Weston switchboard ammeter, Serial No. 21981 is rated at 30 amperes, 500 cycles per second. It was given to the National Bureau of Standards and had been in use on the ship SS Passaic. A tag reads ""tested and inspected in 1929."" It is...
NIST Museum Artifacts

Moving Iron Vane Type AC Ammeter
This Weston model 155 ammeter for measuring alternating current was patented on January 1, 1895. It represents one of the moving-iron vane types in which the current to be measured enters a cylindrical coil of an appropriate number of turns,...
NIST Museum Artifacts

Millivoltmeter
This Weston Model 1 millivoltmeter, Serial No. 12798, was purchased in 1902. It has a center zero and a range of 100 mv.
NIST Museum Artifacts

Weston Model 89 Reflecting Galvanometer
This Weston high-sensitivity galvanometer, Model 89, was sold on the commercial market from 1904-1916 for precise laboratory work. It was superseded by models from the manufacturers Rubicon and Leeds & Northrup. These latter models were based, in...
NIST Museum Artifacts

Torsion-head Type Wattmeter
This wattmeter was given to H.B. Brooks prior to 1940 (perhaps as early as 1915) by the Meter Department of Potomac Electric Power Co. It was given to the National Bureau of Standards (now the National Institute of Standards and Technology) by his...
NIST Museum Artifacts

Reel-less tape memory unit developed by NBS for SEAC
Photographs; History; Metrology; SEAC computer
This was a magnetic tape recorder automatically controlled by SEAC for storage information. This image is part of the SEAC collection. Construction of the Standards Eastern Automatic Computer (SEAC) began in the fall of 1948 in the National Bureau...
Historic Images

Taut Suspension Type D-C Voltmeter
This voltmeter was constructed in the 'early nineties' (1890s) by H.B. Brooks, who later became Chief of Electrical Instruments Section at the National Bureau of Standards (now the National Institute of Standards and Technology). It was needed to...
NIST Museum Artifacts

Weston Volt-Ohmmeter
This Volt-Ohmmeter built by the Weston Company was used to measure electrical resistance.
NIST Museum Artifacts

Vibration Galvanometer
This vibration galvanometers were used in the Inductance and Capacitance Section as early as 1911. It is probably of Wiens design and have tiny bar magnets cemented to the back of the mirror. The winding is on a split toroid core of white plastic.
NIST Museum Artifacts

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