U.S. flag

An official website of the United States government

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.

Chemistry

Search Publications

Search Title, Abstract, Conference, Citation, Keyword or Author
  • Published Date
Displaying 901 - 925 of 1924

Relaxation Effects in Small Critical Nozzles

January 1, 2006
Author(s)
Aaron N. Johnson, C L. Merkle, Michael R. Moldover, John D. Wright
We computed the flow of four gases (He, N 2, CO 2, and SF 6) through a critical nozzle by augmenting traditional computational fluid dynamics (CFD) with a rate equation that accounts for τ relax, a species-dependent relaxation time that characterizes the

Polycyclic Aromatic Hydrocarbons in Flames, in Diesel Fuels, and in Diesel Emissions

December 1, 2005
Author(s)
R Dobbins, Robert A. Fletcher, Bruce A. Benner Jr., S Hoeft
Numerous chemical analyses of gaseous and particulate samples from laboratory flames provide a library of data on the polycyclic aromatic hydrocarbons (PAH) species found in diverse flame types burning fuels consisting of pure gaseous hydrocarbons. Diesel

Correlation Charts for Ultraviolet-Visible Spectrophotometry

October 31, 2005
Author(s)
Thomas J. Bruno, Paris D. Svoronos
This section provides correlation charts and operational information for the design and interpretation of ultraviolet spectrophotometric (UV-Vis) measurements. While UV-Vis. is perhaps not as information-rich as infrared or nuclear magnetic resonance, it

Infrared Spectrophotometry

October 31, 2005
Author(s)
Thomas J. Bruno, Paris D. Svoronos
In this chapter, we present a series of correlation charts to aid in the interpretation of infrared spectra, and in performing infrared spectroscopic measurements. The correlation charts represent the characteristic absorptions that are produced by

Nuclear Magnetic Resonance Spectroscopy

October 31, 2005
Author(s)
Thomas J. Bruno, Paris D. Svoronos
This section provides correlation charts and operational information for the design and interpretation of nuclear magnetic resonance (NMR) measurements.

CCQM K40 DETERMINATION OF PCB CONGENERS IN SOLUTION: FINAL REPORT

October 5, 2005
Author(s)
David L. Duewer, Willie E. May, Reenie M. Parris, Michele M. Schantz, Stephen A. Wise
Abstract. Solutions of known mass fraction of organic analytes of interest are typically used to calibrate the measurement processes used in the determination of these analytes. Appropriate value assignments and uncertainty calculations for these

Direct Preparation of Particles From Liquid Suspension for ESEM or SEM Analysis

October 1, 2005
Author(s)
Scott A. Wight, Richard D. Holbrook
A simplified method for the preparation of particles from liquid suspensions has been developed. Particles are deposited directly on carbon planchets for rapid analysis by environmental scanning electron microscopy or by conventional scanning electron

IMS-Based Trace Explosives Detectors for First Responder Use

September 1, 2005
Author(s)
Jennifer R. Verkouteren, John G. Gillen, R M. Verkouteren, Robert A. Fletcher, E S. Etz, George A. Klouda, Alim A. Fatah, Philip J. Mattson
The purpose of this document is to establish minimum performance requirements and an associated test method for Ion Mobility Spectrometry (IMS) based trace explosives detectors for use by the first responder community. Information concerning the theory and

Evaluation of Pressure Oscillator Losses

August 29, 2005
Author(s)
Peter E. Bradley, Michael A. Lewis, Ray Radebaugh
Efficiencies of regenerative cryocoolers are influenced by losses within the pressure oscillator (compressor). An evaluation of these losses is important when searching for ways to improve the overall cryocooler efficiency. Typically, compressor efficiency

Chemical Warfare Agent Detection Using MEMS Microsensor Arrays

August 1, 2005
Author(s)
Douglas C. Meier, C J. Taylor, Richard E. Cavicchi, Edward White V, M W. Ellzy, K B. Sumpter, Stephen Semancik
Chemical sensors capable of accurate detection of trace quantities of chemical warfare (CW) agents would provide a potent tool for perimeter security, treaty verification, battlefield threat detection, and the protection of civilians in public places

Chemical Warfare Agent Detection Using MEMS-Compatible Microsensor Arrays

August 1, 2005
Author(s)
Douglas C. Meier, C J. Taylor, Richard E. Cavicchi, Edward White, M W. Ellzy, K B. Sumpter, Stephen Semancik
Microsensors have been fabricated consisting of TiO2 and SnO2 sensing films prepared by chemical vapor deposition (CVD) on MEMS- (micro-electromechanical systems) compatible array platforms. Response measurements from these devices to the CW agents GA
Was this page helpful?