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Displaying 5576 - 5600 of 13218

An example crossover experiment for testing new vicarious calibration techniques for satellite ocean color radiometry

October 1, 2010
Author(s)
Kenneth Voss, Scott McLean, Stephanie J. Flora, Michael Feinholz, Mark A. Yarbrough, Charles Trees, Mike Twardowski, Dennis Clark, Marlon Lewis, B. Carol Johnson
… technique with the established MOBY measurement. We found in the laboratory that the radiance and irradiance … estimated uncertainties for various spectral sources. In the field, the sensors measuring the above surface … downwelling irradiance performed as well as they had in the laboratory. However, the water-leaving radiance, Lw, …

Atomistic Factors Governing Adhesion between Diamond, Amorphous Carbon, and Model Diamond Nanocomposite Surfaces

October 1, 2010
Author(s)
Pamela L. Piotrowski, Rachel J. Cannara, Guangtu Gao, Joseph J. Urban, Robert W. Carpick, Judith A. Harrison
… surfaces paired with other carbon-based materials. In the AFM experiments, the work of adhesion between an … on adhesion of variables that are not easily changed in an experiment, including hydrogen coverage, … which more closely modeled the AFM experiment, resulted in adhesion reductions when paired with both …

Safely mounting glass viewports to elastomer sealed vacuum flanges

June 17, 2010
Author(s)
Patrick J. Abbott, Brian R. Scace
… of the O-ring at the point of flange-to-flange contact. In the case of a glass viewport being sealed to a metal … glass and a mating metallic flange may produce stresses in the glass that can lead to failure during system evacuation or while the system is under vacuum. In this paper we first review fundamentals of safe O-ring …

Deactivation of Sub-Melt Laser Annealed Arsenic Ultra Shallow Junctions in Silicon During Subsequent Thermal Treatment

May 4, 2010
Author(s)
Joseph C. Woicik, D. Giubertoni, G. Pepponi, S. Gennaro, M. Bersani, M. A. Sahiner, S. P. Kelty, M. Kah, K. J. Kirkby, R. Doherty, M. A. Foad, F. Meirer, C. Streli, P. Pianetta
… produce a very high level of arsenic electrical activation in Si but subsequent thermal treatments between 500 and 800 C … a level one order of magnitude below the solid solubility. In this work, studies about the deactivation of laser annealed (LA) ultra shallow arsenic distributions in silicon using Hall effect measurements, extended x-ray …

Asynchronous Cooperative MIMO Systems using A Linear Dispersion Structure

February 2, 2010
Author(s)
Hamid Gharavi
… In this treatise, we propose a novel family of Asynchronous … (ACLDCs),which is capable of maintaining full diversity in cooperative scenarios even at the presence of asynchronous … reception. The linear dispersion structure is employed in order to accommodate the dynamic topology of cooperative …

Fabrication of GaAs/AlOx micropillars for small mode volume

January 20, 2010
Author(s)
Richard P. Mirin
… shown promise as single photon sources for applications in quantum key distribution as well as single photon … lattice-matched Bragg layers. We overcome this limitation in a GaAs/AlAs material system by wet thermal oxidation of … Journal of Vacuum Science and Technology B …

AMORPHOUS CALCIUM PHOSPHATE COMPOSITES AND THEIR EFFECT ON COMPOSITE/ADHESIVE/DENTIN BONDING

August 3, 2009
Author(s)
Joseph M. Antonucci, Justin N. O'Donnell, Gary E. Schumacher, Drago Skrtic
… and methacryloxyethyl phthalate (MEP); designated ETHM. In both composite series three fillers were compared: 1) a … 2) milled Zr-ACP and 3) an ion-leachable fluoride glass. In addition to the shear bond strength (SBS), work to … appeared unaffected by filler type or immersion time. In the orthodontic ACP composite series, milled ACP …

Vertical Handoff Decision Algorithms for Providing Optimized Performance in Heterogeneous Wireless Networks

February 3, 2009
Author(s)
SuKyoung Lee, Kotikalapudi Sriram, Kyungsoo Kim, JongHyup Lee, YoonHyuk Kim, Nada T. Golmie
… high-availability and even instantaneous high-bandwidth in some cases. Therefore, it is imperative for network … then seamless vertical handoff is a necessary first step. In the near future, vehicular and other mobile applications … and optimal resource allocation for seamless mobility. In this paper, we develop a vertical handoff decision …

Details of the Mapping Between the CIS/2 and IFC Product Data Models for Structural Steel

January 1, 2009
Author(s)
Robert R. Lipman
… which entities and attributes correspond to each other. In some cases there is a direct one-to-one mapping between CIS/2 and IFC entities and concepts, while in other cases there is a one-to-many or one-to-none mapping. … by the translator have identified several deficiencies in the IFC schema for modeling structural steel and for …

Stray Light Correction of the Marine Optical System

January 1, 2009
Author(s)
M Feinholz, S Flora, M Yarbrough, Keith R. Lykke, Steven W. Brown, B. Carol Johnson, Dennis Clark
… Marine Optical System is a spectrograph-based sensor used in the Marine Optical Buoy for the vicarious calibration of … color satellite sensors. It is also deployed from ships in instruments used to develop bio-optical algorithms that … optical properties of the ocean to its biological content. In this work, an algorithm is developed to correct the …

Synchronization monitoring of I/Q data and pulse carving misalignment for a parallel-type 20-Gb/s RZ-DQPSK transmitter by measuring RF clock tone/low frequency power

December 15, 2008
Author(s)
Jeffrey A. Jargon, Xiaoxia Wu, Laurie Christian, Bo Zhang, Wei-Ren Peng, Jeng-Yuan Yang, Lin Zhang, Scott Nuccio, Loukas Paraschis, Alan Willner
… a technique for monitoring the time misalignment of in-phase/quadrature (I/Q) data streams and pulse carver/data in a 20-Gb/s return-to-zero differential quadrature … IEEE Photonics Technology Letters …

Cancellation of Vibration-Induced Phase Noise in Optical Fibers

November 15, 2008
Author(s)
Archita Hati, Craig W. Nelson, Jennifer A. Taylor, David A. Howe
… Vibration causes mechanical distortions in fiber-optic transmission lines that induce phase … electronic cancellation of vibration-induced phase noise in an optical fiber wound on a spool. We report 20 dB or more … degraded by the vibration-induced phase fluctuations in optical fibers when the temperature is held constant. …

Water Adsorption in Interfacial Silane Layers by Neutron Reflection: 2. Epoxy plus Silane on Silicon Wafers

October 16, 2008
Author(s)
M S. Kent, W F. McNamara, P M. Baca, W Wright, L A. Domeier, A P. Wong, Wen-Li Wu
… over the silane finish and cured. Profiles of D 2 O in the interphase are measured by neutron reflection after … into the interphase region is observed. The D 2 O profile in the interphase can be described by a two layer model … 2 O is detected (detection limit equivalent to 3 percent) in the interface region under the same conditions if the …

Relative Intensity Noise Suppression for Photonic Links

September 15, 2008
Author(s)
Craig Nelson, Archita Hati, David A. Howe
… is usually implemented by inserting an intensity modulator in the optical path and controlling measured light intensity … propose utilizing the intensity modulator already present in a photonic link to perform the task of RIN suppression as … of 10 MHz. Furthermore, we implement this technique in an optoelectronic oscillator (OEO), significantly …

Amorphous Calcium Phosphate Based Composites: Effect of Surfactants and Poly(Ethylene Oxide) on Filler and Composite Properties

August 19, 2008
Author(s)
Joseph M. Antonucci, Da-Wei Liu, Drago Skrtic
… have adverse effects on the properties of ACP composites. In this paper we assessed the influence of non-ionic and … size distribution and compositional properties of ACP. In addition, the mechanical strength of polymeric composites … about 45 % (4.1 m vs. 7.4 m for the Zr-ACP control).In the presence of PEO, however, the dm increased to 14.1 m. …
Displaying 5576 - 5600 of 13218
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