NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 16826 - 16850 of 73697

Comparative study of methods to measure the density of Cementitious powders

December 14, 2015
Author(s)
Michelle A. Helsel, Chiara F. Ferraris, Dale P. Bentz
The accurate measurement of the density of hydraulic cement plays an essential role in the determination of concrete mixture proportions. As more supplementary cementitious materials (SCM), such as fly ash and slag, or cement replacement materials, such as

High-performing visible-blind photodetectors based on SnO2/CuO nanoheterojunctions

December 14, 2015
Author(s)
Ratan K. Debnath, Ting Xie, MD R. Hasan, Nhan V. Nguyen, Abhishek Motayed
We report on the significant performance enhancement of SnO2 thin film ultraviolet (UV) photodetectors (PDs) through incorporation of CuO/SnO2 pn nanoscale heterojuctions. The nanoheterojunctions are self-assembled by sputtering Cu clusters that oxidize in

Inventory and Flow Time in the US Manufacturing Industry

December 14, 2015
Author(s)
Douglas Thomas, Anand M. Kandaswamy
Advancements in the efficient use of inputs, such as land and labor, have been a key driver of per capita income growth throughout history. One method for identifying potential efficiency improvements is lean manufacturing or lean production, a set of

Rotational Dynamics of Organic Cations in the CH 3 NH 3 Pbl 3 Perovskite

December 14, 2015
Author(s)
Tianran Chen, Benjamin J. Foley, Bahar NMN Ipek, Madhu Sudan Tyagi, John R. Copley, Craig Brown, Joshua J. Choi, Seunghun Lee Lee
All semiconductors can generate free charges by absorbing light. However, not all semiconductors are high performance photovoltaic materials, because the charge carriers with opposite signs, electrons and holes, quickly annihilate each other. High

Broadband Optical Properties of Graphene by Spectroscopic Ellipsometry

December 11, 2015
Author(s)
Wei Li, Nhan Van Nguyen, Guangjun Cheng, Angela R. Hight Walker, David J. Gundlach, Yiran Liang, boyuan Tian, Xuelei Liang, Lian-Mao Peng
The broadband (0.7 eV to 9.0 eV) optical properties of chemical-vapor-deposition (CVD) grown graphene are determined by spectroscopic ellipsometry. The optical absorption follows the fine structure constant in the energy range from 1.0 eV to 2.0 eV, but

Femtosecond synchronization of optical clocks over free-space links

December 11, 2015
Author(s)
Jean-Daniel Deschenes, Laura C. Sinclair, Fabrizio R. Giorgetta, William C. Swann, Esther Baumann, Hugo Bergeron, Michael A. Cermak, Nathan R. Newbury
The use of optical clocks/oscillators in future ultra-precise navigation, gravitational sensing, and relativity experiments will require time comparison and synchronization over terrestrial or satellite free-space links. Here we demonstrate full

Magnetic Structure and Exchange Interactions in Quasi-One-Dimensional MnCl 2 (urea) 2

December 11, 2015
Author(s)
Jamie L. Manson, Qingzhen Huang, Craig Brown, Jeffrey W. Lynn, Matthew B. Stone, John Singleton, Fan Xiao
MnCl 2(urea) 2 is a new linear chain coordination polymer that exhibits slightly counter-rotated MnCl 4 rhomboids along the chain-axis. The material crystallizes in the non-centrosymmetric orthorhombic space group Iba 2, with each Mn(II) ion equatorially

Novel Cyber Physical System for 3D Imaging of the Small Intestine in Vivo

December 11, 2015
Author(s)
Kamran Sayrafian, Kaveh Pahlavan, Yishuang Geng, David Cave, GUANQUN BAO, LIANG MI, EMMANUEL AGU, ANDREW KARELLAS, VAHID TAROKH
Small intestine is the longest organ in the gastrointestinal tract where much of the digestion and the food absorption take place. Wireless video capsule endoscope (VCE) is the first device taking 2-D pictures from the lesions and the abnormalities in the

An Industrial Control System Cybersecurity Performance Testbed

December 10, 2015
Author(s)
Richard Candell, Timothy A. Zimmerman, Keith A. Stouffer
The National Institute of Standards and Technology (NIST) is developing a cybersecurity performance testbed for industrial control systems. The goal of the testbed is to measure the performance of industrial control systems (ICS) when instrumented with

Charge transfer stabilization of late transition metal oxide nano-particles on a layered niobate support

December 10, 2015
Author(s)
Megan E. Strayer, Thomas Senftle, Jonathan P. Winterstein, Nella M. Vargas-Barbosa, Renu Sharma, Robert M. Rioux, Michael J. Janik, Thomas Mallouk
The interfacial interactions between late transition metal/metal oxide nanoparticles and oxide supports impact catalysts' activity and stability. Here, we report the use of isothermal titration calorimetry (ITC), electron microscopy and density functional

Comparison of two methodologies for calibrating satellite instruments in the visible and near-infrared

December 10, 2015
Author(s)
Steven W. Brown, Keith R. Lykke, Robert A. Barnes, Bruce Guenther, James J. Butler, Thomas Schwarting, David Moyer, Frank DeLuccia, Christopher Moeller
Traditionally, satellite instruments that measure Earth-reflected solar radiation in the visible and near infrared wavelength regions have been calibrated for radiance responsivity in a two-step method. In the first step, the relative spectral response

COMPUTATIONAL ENVIRONMENT FOR MODELING AND ENHANCING COMMUNITY RESILIENCE: INTRODUCING THE CENTER FOR RISK-BASED COMMUNITY RESILIENCE PLANNING

December 10, 2015
Author(s)
John W. van de Lindt, Bruce Ellingwood, Therese P. McAllister, Gardoni Paolo, Daniel Cox, Harvey Cutler, Walter G. Peacock
The resilience of a community is defined as its ability to prepare for, withstand, recover from and adapt to the effects of natural or human-caused disasters, and depends on the performance of the built environment and on supporting social, economic and

Electronic Health Record Design Considerations in Responding to Incidences of Highly Infectious Diseases: Clinical Workflows and Exception Handling

December 10, 2015
Author(s)
Svetlana Z. Lowry, Mala Ramaiah, Emily S. Patterson, Latkany A. Paul, Debora Simmons, David Brick, Michael C. Gibbons
Adoption of Electronic Health Record systems in all care settings has become widespread. EHRs can support and revolutionize the way that public health is protected in the event of an outbreak of a highly infectious disease. In particular, EHRs can support

Gapped and Gapless Short-Range-Ordered Magnetic States with (1/2,1/2,1/2) Wave Vectors in the Pyrochlore Magnet Tb 2+x Ti 2-X O 7+d

December 10, 2015
Author(s)
E. Kermarrec, D. D. Maharaj, J. Gaudet, K. Fritsch, D. Pomaranski, J. B. Kycia, Yiming Qiu, John R. Copley, M. M. P. Couchman, A. O. R. Morningstar, H. A. Dabkowska, B. D. Gaulin
Recent low temperature heat capacity (CP ) measurements on polycrystalline samples of the py- rochlore antiferromagnet Tb 2+xTi 2¿xO 7+δ have shown a strong sensitivity to the precise Tb con- centration x, with a large anomaly exhibited for x0.005 at TC0.5

Measuring and Representing the Performance of Manufacturing Assembly Robots

December 10, 2015
Author(s)
Michael O. Shneier, Elena R. Messina, Craig I. Schlenoff, Frederick M. Proctor, Thomas Kramer, Joseph Falco
With the growth of robotic technology, there is a need for performance measures to characterize and compare robots and to help determine which features are most suited to a particular application. Robot systems are complex and involve a wide range of

Structural Changes and Aggregation Mechanisms for Anti-Streptavidin IgG1 at Elevated Concentration

December 10, 2015
Author(s)
Gregory V. Barnett, Wei Qi, Samiul Amin, E. Neil Lewis, Vladimir I. Razinkov, Bruce A. Kerwin, Yun Liu, Christopher J. Roberts
Non-native protein aggregation may occur during manufacturing and storage of protein therapeutics, and this may decrease drug efficacy or jeopardize patient safety. From a regulatory perspective, changes in higher-order structure due to aggregation are of

Trusted Geolocation in the Cloud: Proof of Concept Implementation

December 10, 2015
Author(s)
Michael Bartock, Murugiah Souppaya, Raghuram Yeluri, Uttam Shetty, James Greene, Steve Orrin, Hemma Prafullchandra, John McLeese, Jason Mills, Daniel Carayiannis, Tarik Williams, Karen Scarfone
This publication explains selected security challenges involving Infrastructure as a Service (IaaS) cloud computing technologies and geolocation. It then describes a proof of concept implementation that was designed to address those challenges. The
Displaying 16826 - 16850 of 73697
Was this page helpful?