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Displaying 1276 - 1300 of 2957

The spectrum of Fe II

January 1, 2013
Author(s)
Gillian Nave, S Johansson
The spectrum of singly-ionized iron (Fe II) has been recorded using high-resolution Fourier transform and grating spectroscopy over the wavelength range 900 Å to 5.5 μm. The spectra were recorded in high-current continuous and pulsed hollow cathode

Calibrated nanoscale capacitance measurements using a scanning microwave microscope

November 2, 2010
Author(s)
H P. Hubner, M. Moertelmaier, Pavel Kabos, M. Fenner, C Rankl, Atif A. Imtiaz
A scanning microwave microscope (SMM) for spatially resolved capacitance measurements in the attofarad-to-femtofarad regime is presented. The system is based on the combination of an atomic force microscope (AFM) and a performance network analyzer (PNA

Micro-Feature Metrology

May 1, 2005
Author(s)
Bala Muralikrishnan, Jack A. Stone Jr., John R. Stoup
This presentation focuses on three aspects of micro-feature metrology novel applications that drive research and commercialization, capabilities and limitations of existing sensors and techniques, and finally a summary of recent research including ongoing

High-efficiency Coherence-Preserving Harmonic Rejection with Crystal Optics

September 1, 2018
Author(s)
Fan Zhang, Andrew J. Allen, Lyle E. Levine, Gabrielle G. Long, Ivan Kuzmenko, Jan Ilavsky
We report a harmonic rejection scheme based on the combination of Si (111) monochromator and Si (220) harmonic-rejection crystal optics. This approach is of importance to a wide range of X- ray applications in all three major branches of modern X-ray

Polymers in Particulate Systems: Properties and Applications

November 1, 2001
Author(s)
Vincent A. Hackley, P Somasundaran, J A. Lewis
Soluble polymers are key additives for a broad range of industrial and biomedical applications, including advanced ceramics, mineral separations, high performance cement, and bioceramic coatings and composites. Such species find widespread use as

Cement Hydration: The Role of Adsorption and Crystal Growth

August 6, 2013
Author(s)
Gilberto Artioli, Jeffrey W. Bullard
Portland cement is a fundamental structural and binding material for industry and society. Its structural and physical properties at different scales show a complexity that can presently be barely managed through experimental and computational methods

Nanofabrication via Atom Optics

January 1, 2000
Author(s)
Jabez J. McClelland
… via atom optics. Discussion is presented of the fundamentals of atom manipulation and atom optics, with …

Coarse-grained model of the dynamics of electrolyte solutions

August 17, 2017
Author(s)
Jack F. Douglas, Marat Andreev, Juan J. de Pablo, Alexandros Chremos
Ion specific solvation has fundamental implications in biochemistry and the thermo- dynamics and dynamics of aqueous salt solutions has correspondingly been investigated intensively. Nonetheless, recent works have indicated fundamental unresolved issues in

Time in Cyber-Physical Systems

October 2, 2016
Author(s)
Marc A. Weiss, Sundeep Chandhoke, Hugh Melvin
Time is central to predicting, measuring and controlling properties of the physical world, and is one of the most important constraints distinguishing Cyber-Physical Systems from distributed computing in general. However mixing the cyber and the physical

Policy Machine: Features, Architecture, and Specification

October 27, 2015
Author(s)
David F. Ferraiolo, Serban I. Gavrila, Wayne Jansen
The ability to control access to sensitive data in accordance with policy is perhaps the most fundamental security requirement. Despite over four decades of security research, the limited ability for existing access control mechanisms to enforce a

Improved Limits on Variation of the Fine Structure Constant and Violation of Local Position Invariance

May 29, 2007
Author(s)
Tara M. Fortier, Neil Ashby, James C. Bergquist, Marie Delaney, Scott A. Diddams, Thomas P. Heavner, Leo W. Hollberg, Wayne M. Itano, Steven R. Jefferts, K Kim, Windell Oskay, Thomas E. Parker, Jon H. Shirley, Jason Stalnaker, Filippo Levi, Luca Lorini
We report tests of Local Position Invariance (LPI) and constancy of fundamental constants from measurements of the frequency ratio of the 282-nm 199Hg + optical clock transition to the ground-state hyperfine splitting in 133Cs. Analysis of the frequency

X-ray Scattering and Fluorescence From Atoms and Molecules

January 1, 2000
Author(s)
S H. Southworth, L Young, E P. Kanter, Thomas W. LeBrun
Fundamental understanding of x-ray interactions with atoms and molecules provides a basis for applying x-ray methods to complex materials, such as structural determinations by x-ray diffraction and extended x-ray absorption fine structure. Compton

Understanding the U.S. National Standards System

June 1, 2002
Author(s)
K J. Johnsen
This article, intended for publication in German in Germany, clarifies attributes of the U.S.standards system and its similarities and differences with European and international counterparts. In the United States, standardization is essentially a free
Displaying 1276 - 1300 of 2957
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