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Displaying 30251 - 30275 of 73830

The Si-Route to the Avogadro Constant: Latest Measurements on Natural Silicon; Highly Enriched 28 Si Is Next

October 16, 2008
Author(s)
P De Bievre, S Valkiers, P D. Taylor, P Becker, H Bettin, U Kuetgens, A Nicolaus, H U. Danzebrink, K Fujii, A Waseda, Giovanni Mana, A Peuto, M J. Kenny, A J. Leistner, R Kessel, G Zosi, A Picard, F Spaepen, H Riemann, H S. Peiser
New measurements of the molar volume and lattice parameter of natSi, in near-perfect Si crystals, are reported. The present determination confirms the previously published value of the Avogadro constant within the stated uncertainty. all relevant

The Superconductive Critical Magnetic Field of Beryllium

October 16, 2008
Author(s)
Robert J. Soulen, J H. Colwell, William E. Fogle
We have measured the temperature dependence of the superconductive critical magnetic field of several samples of beryllium from three different sources. The data were well represented by the BCS model of superconductivity. The values of T c and H c(O) were

The Upper Critical Magnetic Field of a Superconductor as a Function of Disorder

October 16, 2008
Author(s)
Robert J. Soulen, M. S. Osofsky, G T. Woods, William F. Egelhoff Jr.
We have observed a dramatic enhancement of H c2 in the system, Nb 1-x Si x, as a function of disorder. To account for these empirical results, we incorporate expressions derived previously for T and N as a function of disorder into the GLAG equation for H

Theory of Curvature and Grooving Effects in DIGM I: The Physics

October 16, 2008
Author(s)
John W. Cahn, O Penrose
We take the formulation of steady-state diffusion-induced grain boundary motion from our earlier work [1], and combine it with the results of Mullins' theory for surface grooves from steadily moving grain boundaries, to formulate a theory of DIGM in thin

Thermal Plasma Synthesis of Magnetic Nanoparticles

October 16, 2008
Author(s)
J H. Scott, S. A. Majetich, Z Turgut, M E. McHenry, K Chowdary, M I. Boulos
A scalable synthesis route for the production of bare and carbon-coated metal nanoparticles is presented. Magnetic nanoparticles composed of pure Fe, pure Co, and FeCo alloys ranging from Fe 50Co 50 to Fe 75Co 25 are produced using a radio frequency (RF)

Thermally Stable Ge/Cu/Ti Ohmic Contacts to n-type GaN

October 16, 2008
Author(s)
Nadin Mahadik, M V. Rao, Albert Davydov
he performance of novel Ge/Cu/Ti metallization scheme on n-type GaN has been investigated for obtaining thermally and electrically stable low resistance ohmic contacts. Isochronal (2 min) anneals in the 600 degrees C to 740 degrees C temperature range and

Thermo-Mechanical Fatigue as a Failure Mechanism in Interconnects

October 16, 2008
Author(s)
Cynthia A. Volkert, R R. Keller, Reiner Monig, E Arzt, O Kraft
The possibility of failure of interconnects in microelectronic devices due to fatigue during normal use is discussed. During their lifetime, devices experience many thermal cycles with temperature amplitudes as large as 100 C, due to current- and to power

Thermodynamic Assessment of the Co-Mo System

October 16, 2008
Author(s)
Albert Davydov, Ursula R. Kattner
The experimental thermochemical and phase diagram data for the Co-Mo system were assessed. A consistent thermodynamic description, using a Redlich-Kister model for the solution phases and sublattice and line compound models for the intermetallics, was

Thermodynamics of Regenerative Refrigerators

October 16, 2008
Author(s)
Ray Radebaugh
Regeneration refrigerators operate with oscillating pressures and flows. Such refrigerators include the Stirling, Gifford-McMahon, and pulse tube refrigerators. This book chapter introduces the thermodynamics for analyzing such refrigeration systems. The

Thermomechanical fatigue testing of thin metal films

October 16, 2008
Author(s)
Reiner Monig, R R. Keller, Cynthia A. Volkert
An experimental method is described for performing thermomechanical fatigue testing of thin films and interconnects on substrates. The method used alternating currents to generate temperature, stain, and stress cycles in the metal structures. The details

Thermophysical Properties of Chlorine from Speed-of-Sound Measurements

October 16, 2008
Author(s)
John J. Hurly
The speed of sound was measured in gaseous chlorine using a highly precise acoustic resonance technique. The data span the temperature range 260 K to 440 K and the pressure range 100 kPa to the lesser of 1500 kPa or 80 % of the sample's vapor pressure. A

Thickness Dependence of Magnetic Film Edge Properties in Ni 80 Fe 20 Stripes

October 16, 2008
Author(s)
Robert D. McMichael, C A. Ross, V P. Chuang
Measurements of trapped spinwave edge modes in transversely magnetized stripe arrays of Ni80Fe20 largely confirm pervious theoretical predictions for the thickness dependence of the edge saturation field Hsat and the effective out-of-plane edge anisotropy

Threading and Unthreading of Pseudorotaxanes of PEG/Acyclodextrin

October 16, 2008
Author(s)
Barry J. Bauer, Da-Wei Liu
The threading and unthreading kinetics of alpha-cyclodextrin onto polyethylene glycol is measured by small angle neutron scattering and gel permeation chromatography. The threading is autocatalytic, once threading of a PEG chain is started, it rapidly

Toward Optical Frequency Electronics

October 16, 2008
Author(s)
D J. Jones, S T. Cundiff
Recently, there have been significant advances in measuring and controlling the phase of ultrashort optical pulses. These developments have begun to blur the distinction between optics and electronics. In the latter it is possible to completely
Displaying 30251 - 30275 of 73830
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