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Displaying 29651 - 29675 of 74030

Recommended List of Common Impurities for Metallic Fixed-point Materials of the ITS-90

August 18, 2008
Author(s)
Dean C. Ripple, Anatoly Pokhodun, Peter Steur, Gregory F. Strouse
Working Group 1 of the Consultative Committee for Thermometry (CCT) has recommended methods for estimating the uncertainties of fixed-point temperatures attributable to chemical impurities [1]. These methods require chemical analysis of all commonly found

Report from the Mise en Pratique Task Group: the next international temperature scale and the mise en pratique for the definition of the kelvin

August 18, 2008
Author(s)
Dean C. Ripple, Bernd Fellmuth, Joachim Fischer, Graham Machin, PPM Steur, Osamu Tamura, Rod D. White
The Consultative Committee for Thermometry has asked Working Group 1 to coordinate a task group formulating an assessment and possible work plan for the next International Temperature Scale and to prepare and maintain the mise en pratique for the

Strategies for Closing the ITRS Funding Gap

August 18, 2008
Author(s)
Yaw S. Obeng, Stephen Knight, Joaquin (. Martinez
For over 35 years, each IC generation has doubled the transistor count while cutting the cost per function in half. This progress, described by Moore's Law, has resulted primarily from scaling device dimensions and wafer size. In reality, the 'Moore's Law'

Wireless Communications in Tunnels for Urban Search and Rescue Robots

August 18, 2008
Author(s)
Catherine A. Remley, George Hough, Galen H. Koepke, Dennis G. Camell, Robert Johnk, Chriss A. Grosvenor
We report on propagation tests carried out in a subterranean tunnel to support improved wireless communications for urban search and rescue robots. We describe single-frequency and ultrawideband channel-characterization tests that we conducted, as well as

Assessing the Uncertainty Associated with Product Emission Measurements

August 17, 2008
Author(s)
Cynthia H. Reed, Steven J. Nabinger, Andrew K. Persily
Volatile organic compounds (VOCs) emitted by building materials and products have been shown to significantly impact human health and comfort. As a result, the market for low emitting building materials and products is growing rapidly. However, existing

Development of a Design Guide to Improve Building IAQ

August 17, 2008
Author(s)
Andrew K. Persily, Martha Hewett, Jude Anders, Lynn Bellenger, Ronald Burton, John Girman, Eli HowardI, Eric Werling
Building owners and developers, and the designers and contractors they employ, are faced with a variety of requirements related to building function, regulations, and environmental impacts. These professionals often address indoor air quality through

The International State of Building System Commissioning

August 17, 2008
Author(s)
Natascha S. Milesi-Ferretti, Nobuo Nakahara, Harunori Yoshida
Buildings are a major and growing source of energy consumption and as such, contribute to the significant problems associated with energy dependence and growing environmental impacts. Building system commissioning is a quality assurance process designed to

Ventilation Measurements in Selected IAQ Studies

August 17, 2008
Author(s)
Andrew K. Persily
Building and space ventilation rates are primary determinants of indoor pollutant levels and occupant exposures, and the impacts of ventilation on health and comfort have long been recognized in ventilation standards and regulations. Despite the importance

Growth, Crystal Structure, and Properties of Epitaxial BiScO3 Thin Films

August 15, 2008
Author(s)
Igor Levin, Susan Trolier-McKinstry, Michael D. Biegalski, Junling Wang, Alexei A. Belik, E. Takayama-Muromachi
Epitaxial thin films of BiScO3, a compound which is thermodynamically unstable under ambient conditions, were grown on BiFeO3-buffered SrTiO3 substrates despite the very large lattice mismatch between the film and the substrate. The epitaxial BiScO3 films

Highly charged ion (HCI) modified tunnel junctions

August 15, 2008
Author(s)
Joshua M. Pomeroy, Holger Grube
The neutralization energy carried by highly charged ions (HCIs) provides a fundamentally independent method for localizing energy on a target’s surface, producing features and modifying surfaces with fluences and kinetic energies that are negligible for

Passively mode-locked 10 GHz femtosecond Ti:sapphire laser

August 15, 2008
Author(s)
A Bartels, Dirk Heinecke, Scott Diddams
We report a mode-locked Ti:sapphire femtosecond laser emitting pulses as short as 42 fs at 10 GHz repetition rate. When operated with a spectrally-integrated average power greater than 1 W, the associated femtosecond laser frequency comb (FLFC) contains

Piezoelectric Response of Nanoscale PbTiO3 in Composite PbTiO3-CoFe2O4 Epitaxial Films

August 15, 2008
Author(s)
Igor Levin, Tan Zhuopeng, Alexander Roytburd, Katyayani Seal, Brian Rodriguez, Stephen Jesse, Sergei Kalinin, Art Baddorf
Piezoelectric properties of PbTiO3 in 1/3PbTiO3-2/3CoFe2O4 transverse epitaxial nanostructures on differently oriented SrTiO3 were analyzed using conventional and switching-spectroscopy piezoelectric force microscopy. The results confirmed that the

Angle-dependent infrared reflectance measurements in support of VIIRS

August 14, 2008
Author(s)
Simon G. Kaplan, Leonard M. Hanssen, Enrique J. Iglesias
We have developed a goniometric reflectometer using a Fourier-transform infrared (FTIR) spectrometer source for polarized reflectance measurements from 1 um to 20 um wavelength at angles of incidence from 10° to 80°, with an incident beam geometry of

Ligand Exchange Reactions in the Formation of Diphosphine-Protected Gold Clusters

August 14, 2008
Author(s)
Denis E. Bergeron, Orkid Coskuner, Jeffrey W. Hudgens, Carlos A. Gonzalez
Electrospray ionization mass spectrometry is employed to study the formation of L3- and L5-protected gold clusters (L3 = 1,3-Bis(diphenylphosphino)propane; L5 = 1,5-Bis(diphenylphosphino)pentane), and it is found that molecular complexes in which Au+ is

Measuring the Phase Transfer Function of a Phase-Shifting Interferometer

August 13, 2008
Author(s)
JiYoung Chu, Quandou (. Wang, John P. Lehan, Ulf Griesmann, Guangjun Gao
In characterizing the performance of a phase-shifting interferometer, the dependence of the measured height on the spatial frequency is rarely considered. We describe a test mirror with a special height relief that can be used to measure the height

A reversible structural transition in MIL-53 with large temperature hysteresis

August 12, 2008
Author(s)
Yun Liu, Jae-Hyuk Her, Anne Dailly, A. Ramirez-Cuesta, Dan A. Neumann, Craig Brown
The metal-organic framework, MIL-53, can have a structural transition from an open-pored to a closed-pored structure by adsorbing different guest molecules. The aid of guest molecules is believed to be necessary to initiate this "breathing" effect. Using

Improved multiplexed Infrared Single Photon Detectors

August 11, 2008
Author(s)
Sergey V. Polyakov, Alan L. Migdall, V Schettini, Ivo P. Degiovanni, Giorgio Brida, F Piacentini
We discuss a scheme for a photon-counting detection system that overcomes the difficulties of photon-counting at high rates at telecom wavelengths. Our method uses an array of N detectors and a 1-by-N optical switch with a control circuit to direct input
Displaying 29651 - 29675 of 74030