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Displaying 1476 - 1500 of 2958

Advanced technologies for quantum photonic devices based on epitaxial quantum dots

October 11, 2019
Author(s)
Tian M. Zhao, Yan Chen, Yu Ying, Li Qing, Marcelo I. Davanco, Jin Liu
Photonic quantum technology is creating breakthroughs in both fundamental quantum science and applications such as quantum communication, computation and sensing. Regarded as artificial atoms due to the discrete energy levels they support, semiconductor

Use of Analytical Balances

January 12, 2017
Author(s)
Lane C. Sander
The determination of mass is a fundamental component in quantitative analysis, and weighing accuracy is an important factor for most applications. This presentation will highlight the use of different types of analytical balances and will demonstrate

When does a branched polymer becomes a particle?

September 17, 2015
Author(s)
Alexandros Chremos, Jack F. Douglas
Melts with topologically distinct molecular structures are investigated by molecular dynamics simulation. We determine the mean polymer size and shape, and glass transition temperature for each molecular topology. Both in terms of structure and dynamics

Phase-slip lines as a resistance mechanism in transition-edge sensors

January 27, 2014
Author(s)
Douglas A. Bennett, Daniel R. Schmidt, Daniel S. Swetz, Joel N. Ullom
The fundamental mechanism of resistance in voltage-biased superconducting films is poorly understood despite its importance as the basis of transition-edge sensors (TESs). TESs are utilized in state-of- the-art microbolometers and microcalorimeters

Dimensional Metrology and Imaging of Cellulose Nanocrystals

June 14, 2013
Author(s)
Michael T. Postek, Andras Vladar
Cellulose nanocrystals are one group of nanoparticles that have high potential economic value but, also present many basic research and manufacturing challenges. These challenges are not only in development of the fundamental processes needed for the

Mimicking Biological Design & Computing Principles in Artificial Olfaction

May 27, 2011
Author(s)
Baranidharan Raman, Stephen Semancik
Biology has been an inspiration for designing solutions to many engineering problems including chemical sensing. Modern approaches to chemical sensing have been based on the biological principle of combining cross-selective chemical sensors with a pattern

Surface Oxygen Chemistry of a Gas Sensing Material: SnO 2 (101)

January 1, 2004
Author(s)
M Batzill, K Katsiev, Anne M. Chaka, A C. Diebold
Experimental techniques and density functional theory have been employed to identify the surface composition and structure of SnO 2(101). The stoichiometric Sn 4+O 2 2- surface is only stable at high oxygen chemical potential. For lower oxidizing potential

Passively Mode-locked Glass Waveguide Laser with 14 fs Timing Jitter

December 1, 2003
Author(s)
John B. Schlager, Berton Callicoatt, Richard Mirin, Norman Sanford, David J. Jones, Jun Ye
Ultra-low jitter pulse trains are produced from a passively mode-locked erbium/ytterbium co-doped planar waveguide laser using high-bandwidth feedback control acting on the physical cavity length and optical pump power. Synchronization of a 750 MHz

Some Issues in Particle Size and Size Distribution Characterization of Powders

July 1, 2002
Author(s)
Ajitkumar Jillavenkatesa, James F. Kelly, S J. Dapkunas
Size and size distribution measurement of powders are conducted using different techniques of size analysis.Underlying all these techniques are certain fundamental issues that influence the accuracy and reproducibility ofthe results. A thorough

Greens Functions for Boundary Element Analysis of Anisotropic Bimaterials

May 1, 2001
Author(s)
J R. Berger, Vinod K. Tewary
We present several region-dependent Green's functions for anisotropic bimaterials in two-dimensional elasticity and steady-state heat transfer problems. The details of the various Green's functions for perfect, slipping, and cracked interfaces are given

Exploring a Quantum Degenerate Fermi Gas

February 1, 2001
Author(s)
Deborah S. Jin, B. L. DeMarco, S Papp
We discuss the production and study of a quantum degenerate Fermi gas of atoms. The fundamental difficulty in cooling a gas of fermionic atoms is the lack of rethermalizing collisions in a spin-polarized sample. We overcome this difficulty using

Rockwell Hardness - A Method-Dependent Standard Reference Material

July 1, 1999
Author(s)
Samuel R. Low III, R J. Gettings, Walter S. Liggett Jr, Jun-Feng Song
Rockwell hardness is not a fundamental physical property of a material. It is a method-dependent measurement of the deformation of the material to an applied force. There are no alternative measurement systems to directly or independently measure Rockwell

The Certification of Standard Reference Material 1979: Powder Diffraction Line Profile Standard for Crystallite Size Analysis

July 31, 2020
Author(s)
James Cline, Marcus Mendenhall, Joseph J. Ritter, David R. Black, Albert Henins, John E. Bonevich, Pamela S. Whitfield, James J. Filliben
This rather long-standing project has resulted in a National Institute of Standards and Technology (NIST) Standard Reference Material (SRM) for the analysis of crystallite size from a consideration of powder diffraction line profile broadening. It consists

Chapter 1. An introduction to radio frequency nanoelectronics

September 15, 2017
Author(s)
Thomas M. Wallis, Pavel Kabos
The field of radio frequency (RF) nanoelectronics focuses on the fundamental study and engineering of devices that are enabled by nanotechnology and operate within a frequency range from about 100 MHz to about 100 GHz. This range includes frequencies

Nanotribology: the Link to Macrotribology

February 19, 2017
Author(s)
Stephen M. Hsu
The study of adhesion, friction, and lubrication at the nanoscale is driven by the needs in niicrosystems, MEMS, and small scale devices. Reliabilitydurability of these devices depend on the ability to control these properties. Furthermore, if fast-moving

Time Signals Converging within Cyber-Physical Systems

April 12, 2015
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 (CPS) from distributed computing in general. However mixing the cyber and the

Analysis of High-Resolution Infrared and N 1 CARS Spectra of 34 S 18 O 3

October 16, 2008
Author(s)
Tony Masiello, J Barber, E T. Chrysostom, J Nibler, A G. Maki, A Weber, Thomas A. Blake, R L. Sams
Three fundamental modes and several hot bands of 34S 18O 3 have been investigated using both infrared spectroscopy and coherent anti-Stokes Raman scattering spectroscopy (CARS). Coriolis coupling effects are particularly noticeable in 34S 18O 3 due to the

Extending the Notion of Quality from Physical Metrology to Information and Sustainability

July 30, 2008
Author(s)
Gaurav Ameta, Sudarsan Rachuri, Xenia Fiorentini, Mahesh Mani, Steven J. Fenves, Kevin W. Lyons, Ram D. Sriram
In this paper we intend to demonstrate the need for extending the notion of quality from the physical domain to information and, more comprehensively, to sustainability. In physical metrology there are well established principles such as fundamental units

Dedication to Richard D. Deslattes

November 1, 2001
Author(s)
Ernest G. Kessler, Gabrielle G. Long
On May 16, 2001, the National Institute of Standards and Technology lost a most illustrious career scientist in x-ray research. This volume is dedicated to honor the memory of Richard D. Deslattes and his lifetime of achievments at NIST. Deslattes'

Migdall Responds II: More Correlated Photon Metrology History

November 1, 1999
Author(s)
Alan L. Migdall
I appreciate the comments of Mike Gruntman (Sept., page 80) concerning the history of using correlated pairs of particles(photons) to determine absolute detector quantum efficiencies. Unfortunately there is an overall misunderstanding of the technique
Displaying 1476 - 1500 of 2958
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