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Displaying 25276 - 25300 of 74179

Binary amplitude holograms made from dyed photoresist

May 13, 2011
Author(s)
Quandou (. Wang, Ulf Griesmann, John H. Burnett
A method for fabricating binary amplitude holograms from a dyed photoresist is described. It is of particular interest for holograms that are used as null lenses in the form metrology of aspheric surfaces and wavefronts. A pigment that strongly absorbs

An IEEE 1451.5-802.11 Standard-based Wireless Sensor Network with Embedded WTIM

May 12, 2011
Author(s)
Eugene Song, Kang B. Lee, Steven E. Fick, Alkan Donmez
This paper introduces a reference implementation of the Institute of Electrical and Electronics Engineers (IEEE) 1451.5-802.11 standard-based wireless sensor network (WSN) developed at the National Institute of Standards and Technology (NIST). The WSN

Rotational Grain Boundaries in Graphene

May 12, 2011
Author(s)
Eric J. Cockayne, Gregory M. Rutter, N Guisinger, Jason Crain, Joseph A. Stroscio, Phillip First
Defects in graphene are of interest for their effect on electronic transport in this two-dimensional material. Point defects of typically two-fold and three-fold symmetry have long been observed in scanning tunneling microscopy (STM) studies of graphite

Imaging Cells in Polymer Scaffolds by X-Ray Microcomputed Tomography

May 11, 2011
Author(s)
Shauna M. Dorsey, Sheng Lin-Gibson, Carl Simon Jr.
We have investigated the ability of X-ray microcomputed tomography (CT) to make quantitative, three-dimensional (3D) measurements of cell adhesion and proliferation in polymeric tissue engineering scaffolds. The most common method for examining cells in

Neutron Backscattering

May 11, 2011
Author(s)
B. Frick, Dan A. Neumann
We review the status of neutron backscattering spectrometers on reactors and spallation sources including the most recent instrument developments. After setting the stage by looking briefly at the history of backscattering instruments, we review the

Of Passwords and People: Measuring the Effect of Password-Composition Policies

May 11, 2011
Author(s)
Serge M. Egelman, Saranga Komanduri, Richard Shay, Patrick G. Kelley, Michelle L. Mazurek, Lujo Bauer, Nicolas Christin, Lorrie F. Cranor
Text-based passwords are the most common mechanism for authenticating humans to computer systems. To prevent users from picking passwords that are too easy for an adversary to guess, system administrators adopt password-composition policies (e.g

Recent developments in the NIST Atomic Databases

May 11, 2011
Author(s)
Alexander Kramida
New versions of the NIST Atomic Spectra Database (ASD, v. 4.0) and three bibliographic databases (Atomic Energy Levels and Spectra, v. 2.0, Atomic Transition Probabilities, v. 9.0, and Atomic Line Broadening and Shapes, v. 3.0) have recently been released

Semiclassical Boltzmann transport theory for graphene multilayers

May 11, 2011
Author(s)
Hongki Min, Parakh Jain, Shaffique Adam, Mark D. Stiles
We calculate the conductivity of arbitrarily stacked multilayer graphene sheets within a relaxation time approximation by considering both short-range and long-range impurities. We investigate theoretically the feasibility of identifying the stacking order

Simulation and Analysis for Sustainability in Manufacturing Processes

May 11, 2011
Author(s)
Mahesh Mani, Kevin W. Lyons, Alexander P. Muroyama, Bjorn J. Johansson
Sustainability has become a ubiquitous term in almost every field, especially in engineering design and manufacturing. Recently, an increased awareness of environmental problems and resource depletion has led to an emphasis on environmentally friendly

Field-test of a robust, portable, frequency-stable laser

May 10, 2011
Author(s)
David R. Leibrandt, Michael J. Thorpe, James C. Bergquist, Till P. Rosenband
We operate a frequency-stable laser in a non-laboratory environment where the test platform is a passenger vehicle. We measure the acceleration experienced by the laser and actively correct for it to achieve a system acceleration sensitivity of df/f = 11(2

Phase-coherent detection of an optical dipole force by Doppler velocimetry

May 10, 2011
Author(s)
Michael J. Biercuk, Hermann Uys, Joseph W. Britton, Aaron Vandevender, John J. Bollinger
We report phase-coherent Doppler detection of optical dipole forces using large ion crystals in a Penning trap. The technique is based on laser Doppler velocimetry using a cycling transition in 9Be+ near 313 nm and the center-of-mass (COM) ion motional

Progress on CD-AFM tip width calibration standards

May 10, 2011
Author(s)
Ronald G. Dixson, Boon Ping Ng, Craig D. McGray, Ndubuisi G. Orji, Jon C. Geist
The National Institute of Standards and Technology (NIST) is developing a new generation of standards for calibration of CD-AFM tip width. These standards, known as single crystal critical dimension reference materials (SCCDRM) have features with near

Re-optimized energy levels and Ritz wavelengths of 198Hg I

May 10, 2011
Author(s)
Alexander Kramida
Energy levels and observed spectral lines of 198Hg I were recently compiled at the National Institute of Standards and Technology (NIST) [E. B. Saloman, J. Phys. Chem. Ref. Data 35, 1519 (2006)]. In that compilation, the energy level values were optimized

Characterization of the Range Performance of a 3D Imaging System (NIST TN 1695)

May 9, 2011
Author(s)
Geraldine S. Cheok, Kamel S. Saidi, Marek Franaszek, James J. Filliben, Nicholas Scott
A 3D imaging instrument is a non-contact measurement instrument used to rapidly obtain 3D information about a scene or object. The use of and the applications for these instruments have grown tremendously in the last decade. The expanded use of 3D imaging

Dual-wavelength transfer standard for laser peak-power measurement

May 9, 2011
Author(s)
Rodney W. Leonhardt, Daniel King
The National Institute of Standards and Technology (NIST) and the Naval Surface Warfare Center – Corona Division (NSWC) have jointly developed a low-level peak-power radiometer (D-ESR) which functions as a transfer standard for measuring laser pulses at

Improving Fatigue Strength of Alumina through Surface Grading

May 9, 2011
Author(s)
Yvonne B. Gerbig, Linlin Ren, Lela Liu, Sanjit Bhowmick, Malvin Janal, Van Thompson, Yu Zhang
Porcelain veneered alumina crown restorations often fail from bulk fracture resulting from radial cracks that initiate at the cementation surface with repeated flexure of the stiffer crown layers on the soft dentin support. We hypothesize that bulk

Neutron Reflectometry and QCM-D Study of the Interaction of Cellulases with Films of Amorphous Cellulose

May 9, 2011
Author(s)
Gang Cheng, Zelin Liu, Jaclyn K. Murton, Michael Jablin, Manish Dubey, Jaroslaw Majewski, Candice Halbert, James Browning, John F. Ankner, Bulent Akgun, Chao Wang, Alan R. Esker, Kenneth L. Sale, Blake. Simmons, Michael S. Kent
Improving the efficiency of enzymatic hydrolysis of cellulose is one of the key technological hurdles to reduce the cost of producing ethanol and other transportation fuels from lignocellulosic material. A better understanding of how soluble enzymes

PROCEEDINGS OF THE NATIONAL FIRE SERVICE DATA SUMMIT

May 9, 2011
Author(s)
Jason D. Averill, Lori Moore-Merrell, Kathy Notarianni, Robert Santos, Doug Wissoker
Effectively managing a fire department requires an understanding of and an ability to demonstrate how changes to resources will affect community outcomes. It is imperative that fire department leaders, as well as political decision makers, know how fire
Displaying 25276 - 25300 of 74179
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