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Displaying 28826 - 28850 of 74084

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

Excitions in Quantum-Dot Quantum Well Structures

October 16, 2008
Author(s)
W Jaskolski, Garnett W. Bryant
The energy levels and excitation spectra of multi-shell nanocrystals composed of ZnS and CdS layers are investigated. The calculations are performed both in the 6-band envelope function approximation and in the tight-binding approach. Charge separation of

Experimental Demonstration of Signal Extration for LISA

October 16, 2008
Author(s)
O Jennrich, R T. Stebbins, P L. Bender
We present a scheme for the signal extraction for LISA. The underlying principle is demonstrated and an experimental setup for testing thescheme is shown. We discuss possible error sources and the achievable precision.

Experimental Eavesdropping Attack Against Ekert's Protocol Based on Wigner's Inequality

October 16, 2008
Author(s)
F Bovino, A Colla, G Castagnoli, Stefania Castelletto, Ivo P. Degiovanni, M L. Rastello
We experimentally implemented an eavesdropping attack against the Ekert protocol for quantum key distribution based on the Wigner inequality. We demonstrate a serious lack of security of this protocol when the eavesdropper gains total control of the source

Experimental Observations of Evolving Yield Loci in Biaxially Strained AA 5754-O

October 16, 2008
Author(s)
Mark Iadicola, Timothy J. Foecke, Stephen W. Banovic
Experimental measurement of the plastic biaxial mechanical response for an aluminum alloy (AA 5754-O) sheet metal is presented. Traditional methods of multiaxial sheet metal testing require the use of finite element analysis (FEA) or other assumptions of

Experimental Procedures and Results for Benchmark 3: Stage 2 Forming Process

October 16, 2008
Author(s)
Mark Iadicola, Timothy J. Foecke, T B. Stoughton
The Numisheet 2005 Benchmark #3 consists of a two stage forming process performed on four materials (three steels and one aluminum). Stage 1 consists of forming channel sections in a channel draw die with variable penetration draw beads, and is described

Explanation of (hhl) f Habit Planes in Ferrous Alloys

October 16, 2008
Author(s)
H M. Ledbetter, Martin Dunn
We give a possible explanation of the remarkable habit-plane measurements reported by Kajiwara for Fe-Ni-Mn alloys. Examining small, thin (early-stage), martensite plates, Kajiwara found that all habit-plane normals fall on the (hhl)f line, spanning about

Fabry-Perot Metrology for Displacements up to 50 mm

October 16, 2008
Author(s)
John R. Lawall
A system designed to apply Fabry-Perot interferometry to the measurement of displacements is described. Two adjacent modes of a Fabry-Perot cavity are probed, and both the absolute optical frequencies and their difference are used to determine

Fastener Quality Act of 1990; Public Law 101-592

October 16, 2008
Author(s)
Charles D. Ehrlich
The OSS' Technical Standards Activities Program (TSAP) manages responsibilities assigned to NIST under the Fastener Quality Act (FQA) of 1990. Fasteners are a $6 billion U.S. industry critical to the automobile, aerospace, construction, chemical and

Ferdinand Rudolph Hassler (1770-1843) : A Twenty Year Retrospective, 1987-2007

October 16, 2008
Author(s)
H Hassler, Charles A. Burroughs
This publication will bring together remarks, papers, and photographs associated with various Hassler-related events held in Philadelphia and the Washington Metropolitan Area over the past twenty years. Starting with the 180th anniversary in 1987 of the

Field Testing Hopper Scales

October 16, 2008
Author(s)
R C. Suiter
The testing of hopper scales seems to be intimidating to many field inspectors. They dread the task of doing a substitution test or a strain load test; there is often confusion about the difference between the two types of tests, how the error is

Finite Element Modeling of Hybrid Polymer Composite Beams

October 16, 2008
Author(s)
Hai C. Tang, Tze J. Chuang, Tinh Nguyen, Joannie W. Chin, Hanchang F. Wu
Fiber-reinforced polymeric composites provide lightweight, high strength, and corrosive resistance to severe environmental exposures. These composites have been extensively used in aerospace and military application over the last three decades and are
Displaying 28826 - 28850 of 74084