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Displaying 251 - 275 of 570

Accurate Determination of High Energy Gamma-Ray Standards

October 16, 2008
Author(s)
Ernest G. Kessler Jr., Maynard S. Dewey, R Deslattes, Albert Henins, H G. Borner, M Jentschel, H Lehmann
… of accurate crystal diffraction spectroscopy to the 2 to 6 MeV region is described. Gamma-ray standards with a relative uncertainty of (2 to 5)x10 -7 are obtained by measuring the small diffraction … rays produced in neutron capture reactions involving H, 32 S, and 35 Cl are used to demonstrate the measurement …

Is spam an issue for opinionated blog post search?

July 19, 2009
Author(s)
Ian M. Soboroff, Craig Macdonald, Iadh Ounis
In opinion-finding, the retrieval system is tasked with re- trieving not just relevant documents, but those that also express an opinion towards the query target entity. This task has been studied in the context of the blogosphere by groups participating

Kinetics of Isopropanol Decomposition and Reaction with H atoms from Shock Tube Experiments and Rate Constant Optimization using the Method of Uncertainty Minimization using Polynomial Chaos Expansions (MUM-PCE)

September 28, 2020
Author(s)
Laura A. Mertens, Jeffrey A. Manion
… Recent interest in isopropanol (2-propanol, C3H¬7OH) combustion stems from its potential as a … data. We find: k1498 = 10(13.77 ± 0.27) exp( -(32 797 ± 970) K / T) s-1 at (979 to 1212) K and (286 to 484) … to 1142) K and (158 to 323) kPa; and k1504 = 10(5.84 ± 0.32) exp( -(1425 ± 773) K / T) cm3 mol-1 s-1 at (918 to 1142) …

Latent Porosity in Alkali-Metal M 2 B 12 F 12 Salts: Structures and Rapid Room-Temperature Hydration/Dehydration Cycles

October 2, 2017
Author(s)
Dmitry V. Peryshkov, Eric V. Bukovsky, Matthew R. Lacroix, Hui Wu, Wei Zhou, W. Matthew Jones, Matic Lozinsek, Travis C. Folsom, D. Luke Heyliger, Terrence J. Udovic, Steven H. Strauss
… Structures of the alkali metal hydrates Li 2 (H 2 O) 4 Z, LiK(H 2 O) 4 , Na 2 (H 2 O) 3 Z, and Rb 2 (H 2 … 26 times over 8.6 °C, from 3.7 at 23.4 °C to 0.14 at 32.0 °C. For Rb 2 Z - Rb 2 (H 2 O) 2 Z cycles, (rh max )/(rd … decreased 20 times over 8 °C, from 6.7 at 24 °C to 0.34 at 32 °C. In addtion, the reversible substitution of D 2 O for H …

Digital Repository of Mathematical Formulae

October 17, 2014
Author(s)
Howard S. Cohl, Marjorie A. McClain, Bonita V. Saunders, Moritz Schubotz, Janelle Williams
The purpose of the NIST Digital Repository of Mathematical Formulae (DRMF) is to create a digital compendium of mathematical formulae for orthogonal polynomials and special functions (OPSF) and of associated mathematical data. The DRMF addresses needs of

High-performance, vibration-immune, fiber-laser frequency comb

March 1, 2009
Author(s)
Esther Baumann, Fabrizio R. Giorgetta, Jeffrey W. Nicholson, William C. Swann, Ian R. Coddington, Nathan R. Newbury
… 20 Hz to 200 kHz and an integrated in-loop phase noise of 32 mrad from 1 Hz to 1 MHz. Moreover, the comb remains phase …

The molecular basis of mesophase ordering in a thiophene-based copolymer

February 18, 2009
Author(s)
Dean M. DeLongchamp, Regis J. Kline, Youngsuk Jung, Eric K. Lin, Daniel A. Fischer, David J. Gundlach, Andrew Moad, Lee J. Richter, Michael F. Toney, Martin Heeney, Iain McCulloch
… The carrier mobility of poly(2,5-bis(3-alkylthiophen-2-yl) thieno[3,2-b]thiophene) semiconductors can be substantially enhanced …

Thermodynamic Properties of 2-Methylquinoline and 8-Methylquinoline

February 9, 2005
Author(s)
Robert D. Chirico, William Steele
… of the standard thermodynamic properties for gaseous 2-methylquinoline (Chemical Abstracts registry number … 8 methylquinoline (Chemical Abstracts registry number [611-32-5]) are reported. Experimental methods include oxygen bomb … Thermodynamic Properties of 2-Methylquinoline and 8-Methylquinoline …

Marginally Flammable Materials: Burning Velocity of Trans-Dichloroethylene

September 10, 2000
Author(s)
Gregory T. Linteris, Valeri I. Babushok
… the first measurements of the flame speed of trans-1,2-dicholorethylene (TDCE). Data are presented for a fuel … air at a fuel-air equivalence ratio φ of 1.0, 1.1 and 1.2. Data are also presented for stoichiometric flames of pure … and at two values of the oxidizer oxygen mole fraction (0.32 and 0.365) over a range of equivalence ratio (0.65 …

Marginally Flammable Materials: Burning Velocity of Trans-Dichloroethylene.

September 10, 2000
Author(s)
Gregory T. Linteris, Valeri I. Babushok
… the first measurements of the flame speed of trans-1,2-dicholorethylene (TDCE). Data are presented for a fuel … air at a fuel-air equivalence ratio φ of 1.0, 1.1 and 1.2. Data are also presented for stoichiometric flames of pure … and at two values of the oxidizer oxygen mole fraction (0.32 and 0.365) over a range of equivalence ratio (0.65 …

Determination of the Scattering Lengths of 39 K from 1 u Photoassociation Lineshapes

December 1, 1999
Author(s)
Carl J. Williams, Eite Tiesinga, Paul S. Julienne, H Wang, W C. Stwalley, P L. Gould
… photoassociation spectra of the purely long-range 39 K 2 1 u state. The existence of hyperfine structure in the excited K 2 1 u state and a knowledge of the Hamiltonian structure for … shows that the 39 K scattering lengths are between -3.2 nm and +0.8 nm (-60a o and + 5a o , where 1a o = 1 a.u. = …
Displaying 251 - 275 of 570
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