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Displaying 30076 - 30100 of 73818

Reactive Intermediates in Combustion

October 16, 2008
Author(s)
John K. Merle, Christopher M. Hadad
This chapter provides an introduction into the chemistry of reactive intermediates that are typically generated by combustion. Several aspects of combustion chemistry are reviewed: (i) low- and high-temperature mechanisms for saturated and unsaturated

Realizing the SI in the 21st Century at NIST

October 16, 2008
Author(s)
K B. Gebbie
As it embarks on its second 100 years, the National Institute of Standards and Technology is developing new approaches to realizing and disseminating the SI. Efforts to improve the realization of the second include development of a laser-cooled cesium

Really Cool Molecules

October 16, 2008
Author(s)
Paul S. Julienne
Ultracold molecules have been made by applying a time-dependent magnetic field to a dilute quantum gas of ultracold trapped fermionic atoms. This raises the prospect of creating novel superfluids and molecular Bose-Einstein condensates.

Recent Developments in Y STR and Y SNP Analysis

October 16, 2008
Author(s)
John Butler
This article reviews new genetic markers on the Y chromosome and methods for analyzing these short tandem repeat (STR) and single nucleotide polymorphism (SNP) loci. Relative chromosomal locations for over 50 Y STRs are described along with their repeat

Reciprocity in Reverberation Chamber Measurement

October 16, 2008
Author(s)
David A. Hill
Even though reverberation chambers have been used primarily for radiated immunity testing, they are reciprocal devices that are equally applicable for radiated emissions testing. This short paper presents the theory for radiated emissions testing and uses

Recombinant Anthranilate Synthase From the Marine Hyperthermophile Archaeoglobus Fulgidus: Expression, Purification, Characterization and Stabilization of the Cooperatively-Regulated Heterotetrameric Enzyme

October 16, 2008
Author(s)
W M. Byrnes, V L. Vilker
Thermostable anthranilate synthase from the marine sulfate-reducing hyperthermophile Archaeoglobus fulgidus has been expressed in Escherichia coli, purified, and characterized. The functional enzyme is an α 2β 2 heterotetrameric complex of molecular weight

Reduced Hardening Time of Calcium Phosphate Cements

October 16, 2008
Author(s)
Milenko Markovic, S. Takagi, Laurence C. Chow
The first self-hardening calcium phosphate cement (CPC) consisting of tetracalcium phosphate (TTCP, Ca 4(PO 4) 2O) and dicalcium phosphate anhydrous (DCPA, CaHPO 4) or dicalcium phosphate dihydrate (DCPD, CaHPO 4 H x 2H 2O) was developed in 1987. The CPC

Reference Material 8785: Air Particulate Matter on Filter Media

October 16, 2008
Author(s)
George A. Klouda, James J. Filliben, H J. Parish, J C. Chow, J Watson, R Cary
Reference Material (RM) 8785 Air Particulate Matter on Filter Media is intended primarily for use in the evaluation of analytical methods used to characterize the carbon composition of atmospheric fine-particulate matter (PM) for national air quality

Reference Wavelengths for Strong Lines of Atomic Hydrogen and Deuterium

October 16, 2008
Author(s)
Joseph Reader
Wavelengths of the individual fine-structure components of the n=1-2(Ly alpha), n=1-3(Ly beta), n=1-4(Ly gamma), n=1-5(Ly delta), n=1-6(Ly epsilon), n=1-7(Ly xi), n=2-3(H alpha), n=2-4(H beta), n=2-5(H gamma), and n=2-6(H delta), and n=2-7(H epsilon)

Relative Number Squeezing in Bose-Einstein Condensates

October 16, 2008
Author(s)
M Edwards, J A. Dunningham, Karen G. Burnett
We describe a procedure for creating pairs of condensates with appreciable relative number squeezing. We show that our procedure is relatively robust against the effects of loss and may therefore prove to be a practical way of generating such states. We

Relativistic Connection of Discrete- and Continuous-Time Quantum Walks

October 16, 2008
Author(s)
Frederick Strauch
Quantum walks have deep connections to quantum search algorithms, quantum cellular automata, quantum chaotic maps, and quantum state transfer. One of the earliest connections, due to Feynman, is to the Dirac equation. The mathematical details of this

Relativistic Quantum Walks

October 16, 2008
Author(s)
Frederick Strauch
By pursuing the deep relation between the one-dimensional Dirac equation and quantum walks, the physical role of quantum interference in the latter is explained. It is shown that the time evolution of the probability density of a quantum walker, initially

Reliable Control of Josephson Phase Qubits

October 16, 2008
Author(s)
M Steffen, J M. Martinis, Isaac C. Chuang
A quantum bit is a closed two-dimensional Hilbert space, but often experimental systems have three or more energy levels. In a Josephson phase qubit the energy difference between successive levels differ by only a few percent, and hence care must be taken

Reliable Materials Data - The Whys and Wherefores of Data Evaluation

October 16, 2008
Author(s)
J R. Rumble, C P. Sturrock
The tangible products of our world are made from materials; some resulting from natural forces, others from manufacturing. Regardless of the source, the performance we expect from a product depends critically on the materials in that product. For

Remarks on Irreversible Processes and Entropy Increase

October 16, 2008
Author(s)
B Robertson
Thermodynamics defines entropy only at equilibrium and says that, for an isolated system that undergoes an irreversible process, the entropy is increased. It is silent about whether entropy increases monotonically during the irreversible process. Thus it

Repeatable Group Models for Molecular Associations in Dental Collagen

October 16, 2008
Author(s)
Rafael L. Bowen
Type I collagen fibrils are essential components of teeth, bones, and other anatomical structures. A clear understanding of fibril characteristics could be of help in the design of adhesion-promoting compounds for demineralized dentin surfaces. Knowledge

Reply to editor of Flow Control Magazine

October 16, 2008
Author(s)
G E. Mattingly
In the article titled Flow Calibration Laboratory Performance: What Should Your Expectations Be? (Mar/Apr 2001), authors Bowles and Grimley state several times that No national or international standards exist for flow rate (p 25 and 29). I respectfully
Displaying 30076 - 30100 of 73818
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