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Topic Area: Chemistry
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Displaying records 931 to 940 of 1000 records.
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931. Fractal Dimension of Particle Outlines: Meaning, Utility, Limitations, Standard Images and Examples
Topic: Chemistry
Published: 4/1/1999
Author: David S. Bright
Abstract: Only a handful of shape parameters, such as aspect ratio and circularity, are in common use for characterizing individual microscopic particles. The fractal dimension, D, is seeing increased use as an additional shape parameter because particle shape ...

932. Quantitative Absorption Measurements Using Cavity Ringdown Spectroscopy With Pulsed Lasers
Topic: Chemistry
Published: 4/1/1999
Authors: J P. Looney, Joseph Terence Hodges, Roger D van Zee
Abstract: The theory and implementation of quantitative gas phase absorption measurements based on cavity-ringdown spectroscopy with pulsed lasers is discussed. The response of ringdown cavities is modeled using an eigenmode description of the electromagnetic ...

933. The Kilogram: Last remaining artifact
Topic: Chemistry
Published: 4/1/1999
Author: Zeina Jabbour Kubarych
Abstract: The unit of mass, the kilogram, is the last remaining basic unit defined by an artifact. Worldwide efforts are underway to replace the artifact-based definition with invariant alternatives. This paper describes briefly the history of the kilogram, th ...

934. Monitoring the Destruction of Carbon Phases in Soils and Sediments for Sequential Chemical Extractions
Topic: Chemistry
Published: 3/1/1999
Authors: M K Schultz, S R. Biegalski, K G Inn, Lee Lijian Yu, W. C. Burnett, J. L. W. Thomas , G. E. Smith

935. Shear-Induced Restructuring of Concentrated Colloidal Silica Gels
Topic: Chemistry
Published: 2/15/1999
Authors: H J Hanley, Chris D Muzny, B D. Butler, G C. Straty, J Bartlett, E. Drabarek

936. Analysis of Urban Particulate Standard Reference Materials for the Determination of Chlorinated Organic Contaminants and Additional Chemical and Physical Properties
Topic: Chemistry
Published: 2/1/1999
Authors: Dianne L Poster, Michele M Schantz, Stephen A Wise, M. G. Vangel

937. Recent History and Future Challenges of ^u14^C Aerosol Research
Topic: Chemistry
Published: 2/1/1999
Author: Lloyd A. Currie
Abstract: A review is given of some critical events in the development 14C aerosol science, and the profound influence of 14C accelerator mass spectrometry on its current applications and future prospects. The birth of this discipline occurred shortly after th ...

938. SO^dx^ Radical Monoanions--Reactions in Solution and in the Gas Phase
Topic: Chemistry
Published: 2/1/1999
Authors: Robert Elliott Huie, L W. Sieck
Abstract: Sulfur dioxide, SO^d2^, is a major air pollutant and a natural trace atmospheric constituent. The major anthropogenic source of SO^d2^ is the combustion of fossil fuels, although much also arises from scrubbing natural gas and from smelting sulfide ...

939. Surface Sensitivity of Auger-Electron Spectroscopy and X-Ray Photoelectron Spectroscopy
Topic: Chemistry
Published: 1/1/1999
Authors: Cedric John Powell, Aleksander Jablonski, I S Tilinin, S Tanuma, David R. Penn

940. Technical Activities 1998-Chemical Science and Technology Laboratory
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6274
Topic: Chemistry
Published: 1/1/1999
Authors: Hratch G. Semerjian, W Koch
Abstract: This report summarizes the research and services provided by the Chemical Science and Technology Laboratory of the National Institute of Standards and Technology for Fiscal Year 1998. The report includes: a general overview of the laboratory's activ ...

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