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NIST Authors in Bold

Displaying 24651 - 24675 of 74352

Nanoscale Focused Ion Beam from Laser-cooled Lithium Atoms

October 26, 2011
Author(s)
Brenton J. Knuffman, Adam V. Steele, Jon Orloff, Jabez J. McClelland
To advance the capabilities of focused ion beam (FIB) technology, we have created a low-energy FIB from photoionized lithium atoms collected in a magneto-optical trap (MOT). This magneto-optical trap ion source relies on both the low temperature of the

Adjustable Zero Thermal Expansion in Antiperovskite Manganese Nitride

October 25, 2011
Author(s)
Xiaoyan Song, Zhonghua Sun, Qingzhen Huang, Markus Rettenmayr, Xuemei Liu, Martin Seyring, Guannan Li, Guanghui Rao, Fuxing Yin
The zero thermal expansion (ZTE) behavior particularly with a wide operating temperature range in a single material is extremely uncommon. With the clear experimental evidence we report a universal mechanism that controls the ZTE behavior of the

Gallium nitride nanowires achieve crystalline perfection

October 25, 2011
Author(s)
Kristine A. Bertness, Norman A. Sanford, John B. Schlager
A new method of growing a common semiconductor provides an avenue for fabricating perfect crystals in a form that takes advantage of their unique optical, electrical, and mechanical properties.

Homoepitaxial n-core: p-shell gallium nitride nanowires: HVPE overgrowth growth on MBE nanowires

October 25, 2011
Author(s)
Aric Sanders, Paul T. Blanchard, Kristine A. Bertness, Matthew D. Brubaker, Ann Chiaramonti Debay, Christopher M. Dodson, Todd E. Harvey, Andrew M. Herrero, Devin M. Rourke, John B. Schlager, Norman Sanford, Albert Davydov, Abhishek Motayed, Denis Tsvetkov
We present the homoepitaxial growth of p-type, magnesium-doped gallium nitride shells using halide vapor phase epitaxy on n-type gallium nitride nanowires grown by plasma-assisted molecular beam epitaxy. Scanning electron microscopy shows clear dopant

Influence of chain stiffness on thermal and mechanical properties of polymer thin films

October 25, 2011
Author(s)
Jessica M. Torres, Chengqing C. Wang, E. B. Coughlin, John P. Bishop, Richard A. Register, Robert A. Riggleman, Christopher Stafford, Bryan D. Vogt
The effect of main chain stiffness and side chain flexibility on the elastic modulus and glass transition temperature (Tg) of thin polymer films is investigated using non-traditional polymers formed from 5-(2-phenylethylnorbornene). Depending on the

Engineering Organometallic Femtosecond Chemistry: Photochemistry and Dynamics of Ultrafast Chelation of Cyclopentadienylmanganese Tricarbonyl Derivatives with Pendant Benzenecarbonyl and Pyridinecarbonyl Groups

October 24, 2011
Author(s)
Edwin J. Heilweil, Jermaine O. Johnson, Karen L. Mosley, Phillipe P. Lubet, Webster E. Charles, T J. Burkey
A new method was developed to prepare three cyclopentadienyl manganese tricarbonyl derivatives 1, 4, and 5 with different side chains (Mn{ 5-C5H4CH2COR}(CO)3, R = 2- pyridyl 1, phenyl 4, and 4-pyridyl 5). Steady-state UV-vis, FTIR, and NMR studies in

November 2011 SRM Spotlight

October 24, 2011
Author(s)
Regina R. Montgomery
The SRM Spotlight is a newsletter published by the Measurement Services Division for users of NIST standard reference materials. The Spotlight announces new reference materials and provides information about their use. In addition, this newsletter contains

Results from Solar Reflective Band End-to-End Testing for VIIRS F1 Sensor Using T-SIRCUS

October 24, 2011
Author(s)
Jeff McIntire, David Moyer, James K. McCarthy, Steven W. Brown, Keith R. Lykke, Frank De Luccia, Xiaoxiong Xiong, James J. Butler, Bruce Guenther
Verification of the Visible Infrared Imager Radiometer Suite (VIIRS) End-to-End (E2E) sensor calibration is highly recommended before launch, to identify any anomalies and to improve our understanding of the sensor on-orbit calibration performance. E2E

Structural Properties of Bi 2 Te 3 and Bi 2 Se 3 Topological Insulators Grown by Molecular Beam Epitaxy on GaAs(001) Substrates

October 24, 2011
Author(s)
X. Liu, D. J. Smith, J. Fan, Y.-H. Zhang, H. Cao, Y. P. Chen, J. Leiner, Brian Kirby, M. Dobrowolska, J. K. Furdyna
Thin films of Bi 2Te 3 and Bi 2Se 3 have been grown on deoxidized GaAs(100) substrates using molecular beam epitaxy. Cross-sectional transmission electron microscopy established the highly parallel nature of the Bi-Te(Se)-Bi-Te(Se)-Bi quintuple layers

Trust Based Multi-Agent Filtering for Increased Smart Grid Security

October 24, 2011
Author(s)
Ion Matei, Vijay Srinivasan
We address the problem of state estimation of the power system for the Smart Grid.We assume that the monitoring of the electrical grid is done by a network of agents with both computing and communication capabilities. We propose a security mechanism aimed

Microwave measurements of proton tunneling and structural parameters for the propiolic acid - formic acid dimer.

October 21, 2011
Author(s)
Adam M. Daly, Kevin O. Douglass, Laszlo C. Sarkozy, Justin L. Neill, Matt T. Muckle, Daniel P. Zaleski, Brooks H. Pate, Stephen G. Kukolich
Microwave spectra of the propiolic acid-formic acid, (Pro-FA) doubly hydrogen bonded complex were measured in the 1-21 GHz range. Rotational spectra for seven isotopomers were obtained and fit. For the parent isotopomer, a total of 138 a-dipole transitions

Security Automation from a NIST Perspective

October 21, 2011
Author(s)
John F. Banghart, Stephen D. Quinn, Kevin M. Stine
Security automation can harmonize the vast amounts of information technology (IT) data into coherent, comparable information streams that inform timely and active management of diverse IT systems. Through the creation of internationally recognized

Counting Bugs is Harder Than You Think

October 20, 2011
Author(s)
Paul E. Black
Software Assurance Metrics And Tool Evaluation (SAMATE) is a broad, inclusive project at the U.S. National Institute of Standards and Technology (NIST) with the goal of improving software assurance by developing materials, specifications, and methods to

Dual comb-based characterization of rapidly tuned lasers

October 20, 2011
Author(s)
Fabrizio R. Giorgetta, Esther Baumann, Ian R. Coddington, William C. Swann, Nathan R. Newbury, Zeb W. Barber, Peter Roos
Time-resolved, high-accuracy and high-resolution spectroscopy of rapidly tuned cw lasers is critical to realizing their full potential for sensing, but is not possible with conventional spectrometers. We demonstrate a coherent dual-comb-based spectrometer

Using the BACnet Data Source v1.7

October 20, 2011
Author(s)
Michael A. Galler
The BACnet Data Source (BDS) was developed to be used as a component of the Virtual Cybernetic Building Testbed (VCBT) (1), in conjunction with work on various Fault Detection and Diagnostics (FDD) (2) and Building Commissioning (Cx) tools. The VCBT uses

Anisotropic in-plane reversible strain effect in Y 0.5 Gd 0.5 Ba 2 Cu 3 O 7-d coated conductors

October 19, 2011
Author(s)
Daniel C. van der Laan, Dmytro Abraimov, A A. Polyanskii, David C. Larbalestier, J. F. Douglas, R. Semerad, M Bauer
Recent experiments have shown that reversible effects of strain on the critical current density and flux pinning strength in the high-temperature superconductor Bi 2Sr 2Ca 2Cu 3O x can be explained entirely by the pressure dependence of its critical
Displaying 24651 - 24675 of 74352
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