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Displaying 29551 - 29575 of 73697

Elastic and Anelastic Properties of a Copper-Precipited Alloy Steel

October 16, 2008
Author(s)
H M. Ledbetter, Sung Kim, H Ogi
We studied the elastic and anelastic properties of an alloy steel containing 1.1 mass % copper subjected to various isothermal agings. The steel's hardness increases with aging time; after reaching a maximum, it decreases. Peak hardness was 17% higher than

Elastic Coefficients of Monocrystal Gelena (Pbs)

October 16, 2008
Author(s)
Sudook A. Kim, H M. Ledbetter
Using acoustic-resonance spectroscopy, we measured the three independent Voigt C kj (C 11, C 12, C 44) of cubic-symmetry galena (lead sulphide). Our results clarify the discrepancies of previous reports. We report also the internal friction Q -1 ij, the

Elastic Constants and Thermal Expansion Averages of a Polycrystal

October 16, 2008
Author(s)
Roland deWit
This paper derives expressions for the overall average elastic constants and thermal expansion coefficients of a polycrystal in terms of its single crystal components. The polycrystal is assumed to be statistically homogeneous, isotropic, and disordered

Elastic Stiffnesses and Internal Frictions of Monocrystal Quartz

October 16, 2008
Author(s)
H M. Ledbetter, Sudook A. Kim, M Lei
Using acoustic-resonance spectroscopy (with only two point contacts with the specimen), we measured both the real and imaginary parts of the elastic-stiffness tensor C ij of a cultured quartz monocrystal. With trigonal symmetry (32 point group, P3 12 space

Elastic-Stiffness Coefficients of Titanium Diboride

October 16, 2008
Author(s)
H M. Ledbetter, Sudook A. Kim, T Tanaka
Using acoustic-resonance spectroscopy, we measured the monocrystal elastic-stiffness coefficients, the Voigt Cij, of TiB 2. With hexagonal symmentry, TiB 2 exhibits five independent C ij: C 11, C 33, C 44, C 66, C 13. Using Voigt-Reuss-Hill averaging, we

Electrical Manipulation of Gold Nanoparticles for Microfluidic Applications

October 16, 2008
Author(s)
Darwin R. Reyes-Hernandez, Geraldine I. Mijares, Kimberly A. Briggman, Jon C. Geist, Michael Gaitan
An electrical method to trap and release gold nanoparticles to and from the surface of alkanethiol-modified gold electrodes is presented. When a positive bias versus a Ag/AgCl reference electrode was applied to gold electrodes, negatively-charged gold

Electrodeposited Epitaxial Fe Subscript 100-x}Co Subscript x} Films on GaAs

October 16, 2008
Author(s)
J Mallett, Erik B. Svedberg, Mark D. Vaudin, Leonid A. Bendersky, William F. Egelhoff Jr., Thomas P. Moffat
The electrodeposition of epitaxial cube-on-cube Fe _(subscript) 100-x}Co_(subscript) x} films onto n-GaAs is described from ferrous ammonium sulfate solutions containing various concentrations of cobalt sulfate. The cobalt composition in a series of 400nm

Electrokinetic Sample Dilution and Concentration in Microfluidics

October 16, 2008
Author(s)
David J. Ross, K G. Olsen, Laurie E. Locascio
A new method is demonstrated which can be used to produce streams of variable, controlled analyte concentration. The method works by electrokinetically manipulating the analyte velocity so that it is different in different parts of a channel. Because of

Electron Magnetic Resonance: Necessity for a Modified Bloch Equation

October 16, 2008
Author(s)
B- -. Segev, Y B. Band
We show that a modified Bloch equation for the electronic magnetic moment is necessary when the magnetic moment explicitly contains a diamagnetic contribution (a magnetic field induced magnetic moment) in addition to the intrinsic magnetic moment of the

Electron Microprobe Characterization of Si-Ge Alloys and Films for Use as Microanalysis Reference Materials

October 16, 2008
Author(s)
Ryna B. Marinenko, Shirley Turner, Dale E. Newbury, Robert L. Myklebust, Lee L. Yu, Rolf L. Zeisler, David S. Simons, John A. Small
Bulk SiGe wafers cut from single-crystal boules and SiGe thick films on Si wafers were evaluated with the electron probe microanalyzer for the extent of heterogeneity and composition for use as reference standards needed by the microelectronics industry in

Energy Dispersive Spectrometry

October 16, 2008
Author(s)
Dale E. Newbury
Energy dispersive x-ray spectrometry (EDS) is a spectral measurement tool used with a wide variety of excitation sources: electrons, ions and x-ray. Photon measurement is based on photoelectric absorption and conversion into charge. The process is serial

Enhanced Sensitivity to Variation of m e /m p in Molecular Spectra

October 16, 2008
Author(s)
D DeMille, S Sainis
We propose new experiments with high sensitivity to a variation in the electron-to-proton mass ratio \mu=me/mp. We consider a close pair of molecular vibrational levels, where each state is associated with a different electronic potential. The change in

Entanglement Effects on the Dewetting of Polymer Thin Films

October 16, 2008
Author(s)
K A. Barnes, Alamgir Karim, Jack F. Douglas, Da-Wei Liu, Eric J. Amis
We investigate the dewetting of entangled and unentangled polymer films from model viscous polymer and inorganic substrates. Linear and hypergraft polyethyloxazoline (PEOX) polymers are chosen as the unentangled and entangled dewetting fluid, respectively

Environmental Sources, Occurrence, and Effects of Synthetic Musk Fragrances

October 16, 2008
Author(s)
Aaron Peck, Keri C. Hornbuckle
Synthetic musk fragrances are found in virtually every environmental compartment. They are a clear indicator of human impact in natural systems. In air, their concentrations are directly proportional to the human population nearby. In water, the frequency

Erosion Mechanism of Polyanhydrides Containing Oligomeric Ethylene Glycol

October 16, 2008
Author(s)
Brandon M. Vogel, Maria D. Torres, Surya Mallapragada, Balaji Narasimhan
Polyanhydrides are biodegradable polymers that have proved to be excellent drug carriers. Applications of these polymers to protein-based drug delivery systems have been scarce. A suitable carrier may be created by incorporating hydrophilic entities into

Evaluation of Cell Source for Tissue Engineered Ligament: Anterior Cruciate Ligament (ACL), Medial Collateral Ligament (MCL), Achilles Tendon (AT) and Patellar Tendon (PT)

October 16, 2008
Author(s)
James A. Cooper, L A. Bailey, Janell N. Carter, Cynthia Castiglioni, Michelle D. Kofron, Frank K. Ko, Cato T. Laurencin
This study investigated four different connective tissue cell types to determine which cell type is an optimal source for seeding a tissue-engineered Anterior Cruciate Ligament (ACL) replacement. Cells from the ACL, Medial Collateral Ligament (MCL)

Evidence for Electrical Spin Injection Into Silicon

October 16, 2008
Author(s)
Cindi L. Dennis, J F. Gregg, G J. Ensell, S M. Thompson
Electrical spin injection into silicon was studied in a ferromagnet/insulator/silicon/insulator/ferromagnet structure, where the insulator is Si3N4. Si3N4 barriers conduct by hopping conduction (HC) at low voltages, but switch to Fowler-Nordheim tunneling

Examination of Sn Electrodeposit on a Substrate Not Forming Intermetallic

October 16, 2008
Author(s)
Maureen E. Williams, Kil-Won Moon, William J. Boettinger, Daniel Josell
Intermetallic compound (IMC) formation at the interface between the tin (Sn) plating and the copper (Cu) substrate of electronic components has been thought to produce compressive stress in Sn electrodeposits and cause the growth of Sn whiskers. To
Displaying 29551 - 29575 of 73697
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