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.

Search Publications

NIST Authors in Bold

Displaying 1076 - 1100 of 2028

Geographical variation of Persistent Organic Pollutants in eggs of threatened loggerhead sea turtles (Caretta caretta) from Southeastern USA

April 4, 2011
Author(s)
Jennifer M. Lynch, Juan Alava, Jeanette Wyneken, Larry Crowder, Geoffrey Scott, John R. Kucklick
Persistent organic pollutants (POPs) are a recognized man-made threat to sea turtle populations, but the uncertainty surrounding exposure and sensitivity of sea turtles to contaminants is great and makes decision making difficult for conservation managers

Searching for applications with a fine-toothed comb

April 1, 2011
Author(s)
Nathan R. Newbury
Frequency combs, like many ground-breaking technologies, are simple in concept; they results from the spectrum of any regular train of optical pulses. What is remarkable is that this simple picture can be actually realized in a number of different

X-ray Emission Spectroscopy of Nitrogen-rich Compounds

March 31, 2011
Author(s)
Terrence J. Jach, Fernando D. Vila, W. T. Elam, J. D. Denlinger, John J. Rehr
Non-resonant x-ray emission spectroscopy was used to compare the nitrogen-rich compounds ammonium nitrate, trinitrotoluene, and cyclotrimethylene-trinitramine. They are representative of crystalline and molecular structures of special importance in

Electron Ionization Mass Spectra of Alkylated Sulfabenzamides

March 30, 2011
Author(s)
Nino G. Todua, Kirill V. Tretyakov, Roman S. Borisov, Dmitry I. Zhilyaev, Vladimir G. Zaikin, Stephen E. Stein, Anzor I. Mikaia
Mono-, di- and trialkyl derivatives of "sulfabenzamide" (N-4-aminophenylsulfonyl-benzamide) are prepared and their EI mass spectra are examined. It is found that the fragmentation of N- alkylsulfabenzamides (Alkyl = CH3 to n-C5H11) proceeds via a very

Ozone-Depleting Substances (ODSs) and Related Chemicals, Chapter 1 in Scientific Assessment of Ozone Depletion: 2010, Global Ozone Research and Monitoring Project-Report No.52, 516 pp., World Meteorological Organization, Geneva, Switzerland, 2011.

March 30, 2011
Author(s)
Stephen A. Montzka, S. Reimannander, Andreas Engel, Kirstin Kruger, O?Doherty Simon, William T. Sturges , Donald R. Blake , Marcel Dorf Dorf, Paul J. Fraser , Lucien Froidevaux , Kenneth Jucks, Karin Kreher, Michael J. Kurylo III, Abdelwahid Mellouki , John Miller , Ole J. Nielsen , Vladimir L. Orkin, Ronald G. Prinn , Robert Rhew , Michelle L. Santee , Andreas Stohl , Daniel P. Verdonik
The present document will be part of the information upon which the Parties to the United Nations Montreal Protocol will base their future decisions regarding protection of the stratospheric ozone layer. OVERVIEW It has been recognized since the 1970s that

Quantification and Compensation of Unintentional Analyte Aggregation in Electrospray Sampling

March 30, 2011
Author(s)
Mingdong M. Li, Suvajyoti S. Guha, Rebecca A. Zangmeister, Michael J. Tarlov, Michael R. Zachariah
Electrospray (ES) sources are commonly used to introduce non-volatile materials (e.g. nanoparticles, proteins, etc.) in to the gas phase for characterization by mass spectrometry and ion mobility. Recent studies in our group using electrospray ion mobility

CONTINUOUS FLOW ENZYME-CATALYZED POLYMERIZATION IN A MICROREACTOR

March 25, 2011
Author(s)
Santanu S. Kundu, Atul S. Bhangale, William E. Wallace, Kathleen M. Flynn, Charles M. Guttman, Richard Gross, Kathryn L. Beers
Enzymes immobilized on solid supports are increasingly used for chemical transformation because the process is greener and sustainable. Here we use microreactors to study enzyme catalyzed ring opening polymerization of -caprolactone to polycaprolactone. A

Geographic Differences in Organic Contaminants and Stable Isotopes (d13C, d15N) in Thick-billed Murre (Uria lomvia) Eggs from Alaska

March 9, 2011
Author(s)
Stacy S. Schuur, Russell D. Day, Paul R. Becker, Rebecca S. Pugh, Michael B. Ellisor, Keith A. Hobson, David G. Roseneau
Thick-billed murre (Uria lomvia) eggs were collected from four Alaskan colonies in 2002. The contents were analyzed for organic contaminants and carbon (δ13C) and nitrogen (δ15N) stable isotopes. Contaminant concentrations in eggs varied from below

High Accuracy Measurements of OH Reaction Rate Constants and IR and UV Absorption Spectra: Ethanol and Partially Fluorinated Ethyl Alcohols.

March 4, 2011
Author(s)
Vladimir L. Orkin, Victor Khamaganov, Larissa E. Martynova, Michael J. Kurylo III
Rate constants for the gas phase reactions of OH radicals with ethanol and three fluorinated ethyl alcohols, CH3CH2OH (k0), CH2FCH2OH (k1), CHF2CH2OH (k2), and CF3CH2OH (k3) were measured using a flash photolysis resonance-fluorescence technique over the

Comparison of the Sensitivity and Image Contrast in Spontaneous Raman and Coherent Stokes Raman Scattering Microscopy of Geometry Controlled Samples

February 9, 2011
Author(s)
Hyun M. Kim, Chris A. Michaels, Garnett W. Bryant, Stephan J. Stranick
We experimentally compare the performance and contrast differences between spontaneous and coherent Stokes Raman scattering microscopy. We demonstrate the differences on a series of geometry controlled samples that range in complexity from a point (array

Passive Intermodulation due to Self-Heating in Printed Transmission Lines*

February 2, 2011
Author(s)
Eduard Rocas, Juan C. Collado Gomez, Nathan D. Orloff, Jordi Mateu, James C. Booth, Juan M. O'Callaghan, Alberto Padilla
Abstract—This article proposes a mechanism by which third-order intermodulation distortion due to self-heating is generated in transmission lines. The work shows how transmission lines made of several materials whose properties are independent of the
Displaying 1076 - 1100 of 2028