An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
A Fourier-transform infrared (FT-IR) spectrophotometer system is used to measure the transmittance of infrared band-pass filters as a function of wavelength
We have measured the near-normal ordinary ray transmittance and reflectance of crystalline Al 2O 3 from 1.6 m to 11 m and temperatures from 296 K to 582 K. The
Simon G. Kaplan, Leonard M. Hanssen, Alan L. Migdall, G Lefever-Button
We have performed transmittance measurements of metal-film neutral density filters on ultrathin polymer substrates using both Fourier-transform infrared
N G. Abdulaev, G N. Karaschuk, Jane E. Ladner, D L. Kakuev, A V. Yakhyaev, M. Tordova, I O. Gaidarov, V I. Popov, J H. Fujiwara, D Chinchilla, E Eisenstein, G L. Gilliland, K D. Ridge
In this paper we present results of work done on large image browsing. Advances in compression and transmission have allowed efficient usage of storage and
The solid-liquid equilibrium of hard dumbbells with embedded point dipoles is calculated using a generilized van der Waals thery to account for long range
Joseph M. Conny, Cedric J. Powell, Lloyd A. Currie
Standard test data(STD) are simulations of analytical instrument responses that help determine the veracity of computer-based, data analysis procedures that are
Proper balancing of the concentration of citrate ions in soft drinks is important in order to regulate cariogenic potential of these ions. The uptake, or ion
O Urakawa, O Yano, Q Tran-Cong, A Nakatani, Charles C. Han
The phase behavior of trans-stilbene-labeled polystyrene and poly [vinyl methyl ether] mixtures was investigated by using small angle neutron scattering. It was
Robert D. McMichael, Mark D. Stiles, P J. Chen, William F. Egelhoff Jr.
This paper describes ferromagnetic resonance (FMR) and magnetoresistive measurements of thin magnetic films coupled to antiferromagnetic films. First, FMR
In this article, we examine the ability to distinguish between relaxation functions with data over limited range of frequency. It is demonstrated that over
Bettye C. Johnson, P Y. Barnes, Thomas R. O'Brian, James J. Butler, C J. Bruegge, S F. Biggar, P R. Spyak, M M. Pavlov
Laboratory measurements of the bidirecitonal reflectance distribution function (BRDF) of diffusely reflecting samples are required to support calibration in the
This paper describes a general stability measurement method for the short term stability, or repeatability, for radiometers using fixed-point blackbodies [BBs]
Howard W. Yoon, Bettye C. Johnson, D Kelch, S F. Biggar, P R. Spyak
An integrating sphere source developed by MTL Systems, Inc. was calibrated for them by a commercial standards laboratory traceable to the National Institute of
The periodic nonlinearity that arises from nonideal laser sources and imperfections of optical components limits the accuracy of displacement measurements in
Photofragment yields are reported for supersonically cooled H 2O, D 2O, and HOD via one photon, 193 nm photolysis in a slit jet expansion, with OH and OD
The uncertainty of measurements is critical in furthering the development of radiometric science and acquiring an increased understanding of its principles
Revised formulas to estimated diffraction effects in radiometry for point and extended sources are derived. They are found to work as well as or better than
A diagnostic that is useful for checking the algorithmic correctness of Monte Carlo computer programs is presented. The check is made by comparing the Boltzmann
George P. Eppeldauer, Alan L. Migdall, Leonard M. Hanssen
Standard quality InSb radiometers have been developed and characterized at the national Institute of Standards and Technology (NIST). The InSb radiometers will
We describe a simple, convenient method for measuring nonlinearities in displacement-measuring Michelson interferometers. Nonlinearities with a spatial
Ralph Webb, a pioneer in enhanced heat transfer, proselytizes his field for the economic and technical benefit of industry. His mission has been, and always
An orthorhombic crystal form of subtilisin exhibits a systematic variation in growth rates of its three unique faces, resulting in pronounced morphology
The Absolute Integrating-sphere Method was developed and introduced by NIST for the realization of luminous flux unit using an integrating sphere rather than a
The National Institute of Standards and Technology (NIST) candela is maintained via standard photometers which have shown long-term stability better than 0.1%
We present an emf-temperature reference function for platinum versus palladium (Pt/Pd) thermocouples in air for the range 0 degrees {Celsius} to 1500 degrees
A F. Lagalante, C Wood, A M. Clarke, Thomas J. Bruno
The Kamlet-Taft parameters for 25 glycol ethers and aqueous solutions of the 25 glycol ethers were measured. Values for the three Kamlet-Taft parameters; the