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Displaying 33626 - 33650 of 73697

Experimental Techniques for Low-Temperature Measurements

October 1, 2006
Author(s)
John (Jack) W. Ekin
This textbook is written for the experimentalist starting in the laboratory -- beginning graduate students, industry measurement engineers, and materials scientists interested in learning how to design successful low-temperature (1 K to 300 K) measurement

Generalized Test Bed for High-Voltage, High-Power SiC Device Characterization

October 1, 2006
Author(s)
David W. Berning, Allen R. Hefner Jr., J J. Rodriguez, Colleen E. Hood, Angel Rivera
A generalized 25 kV test bed developed to characterize high-voltage, high-power SiC devices is described. The test bed features containment of all high voltage circuits and the device under test (DUT) within a clear plastic interlocked safety box. A fast

Impulse Spectrum Amplitude Uncertainty Analysis

October 1, 2006
Author(s)
Nicholas Paulter, Donald R. Larson
A detailed uncertainty analysis for an impulse spectrum amplitude measurement system is presented. This analysis includes consideration of effects such as temperature, computation algorithms, history of instrument performance, equipment limitations, and

Integral Operators and Delay Differential Equations

October 1, 2006
Author(s)
David E. Gilsinn, Florian A. Potra
We begin this expository essay by reviewing with examples what a typical engineer already knows about statistics. We then consider a central question in engineering decision making, i.e., given a computer simulation of high-consequence systems, how do we

Interprocess Communication in the Process Specification Language

October 1, 2006
Author(s)
Conrad E. Bock
Interprocess communication is ubiquitous in modern computing, appearing most commonly as inputs, outputs, and messaging. This paper formalizes interprocess communication based on the involvement of entities in a process, and how processes determine which

Josephson Voltage Standards Comparison Between CENAM and NIST at 10 V Level

October 1, 2006
Author(s)
Dionisio Hernandez, Enrique Navarette, David Aviles, Yi-hua D. Tang
A comparison of Josephson Voltage Standards (JVS) between the National Institute of Standards and Technology (NIST) and the Centro Nacional de Metrologia (CENAM) held at CENAM from 21st to 23rd of March 2006 is reported. The comparison was made at the 10 V

Merits of PM Noise Measurement over Noise Figure: A Study at Microwave Frequencies

October 1, 2006
Author(s)
Archita Hati, David A. Howe, Fred L. Walls, D. Walker
This paper addresses two issues: (i) it compares the usefulness of phase-modulation (PM) noise measurements vs. noise figure (NF) measurements in characterizing the merit of an amplifier, and (ii) it reconciles a general misunderstanding in using ¿174 dBc

Microcantilever Torque Magnetometry Study of Patterned Magnetic Films

October 1, 2006
Author(s)
L. Yuan, Lan Gao, R. Sabirianov, Sy-hwang Liou, Michelle Chabot, Dong-Hoon Min, John M. Moreland, Bao Shan Han
Microcantilever torque magnetometry (MTM) is a sensitive tool to measure small magnetization changes in the sample. In this paper, we investigated a process for preparing patterned magnetic films on cantilevers and studied the magnetic interactions of a

Mutation-Biased Adaptation in a Protein NK Model

October 1, 2006
Author(s)
Arlin B. Stoltzfus
Evolutionary trends responsible for systematic differences in genome and proteome composition have been attributed to GC:AT mutation bias in the context of neutral evolution or to selection acting on genome composition. A possibility that has been ignored

Nanoparticle Lithography and Imaging Scanning Probe Microscopy

October 1, 2006
Author(s)
Jaroslaw Grobelny, De-Hao D. Tsai, Doo-In Kim, Pradeep N. Namboodiri, Robert F. Cook, Michael R. Zachariah
Scanning tunnelling microscopy (STM) imaging was performed on goldsurfaces with a large coverage of monodispersed silver nanoparticlessoft-landed on the surface from the gas phase. In both ambient and ultra-highvacuum conditions, STM scanning was found to

Notes on an Information Model for Production Rules

October 1, 2006
Author(s)
Peter O. Denno
Production rules are rules used in production systems, sometimes called production rule engines. Production rule engines are commonly used to implement expert systems. This report describes an information model for the exchange of production rules and for

Phase Velocity in Resonant Structures

October 1, 2006
Author(s)
James R. Baker-Jarvis, Michael D. Janezic, Derik Love, Thomas Mitchell (Mitch) Wallis, Christopher L. Holloway, Pavel Kabos
In this paper we present a simple experimental procedure for studying the phase velocity behavior of a metafilm with tunable material properties. Using this approach we have studied the phase-velocity behavior of a metamaterial under different conditions

Predictability of the Technical Variation in Gene Expression Measurements

October 1, 2006
Author(s)
Walter S. Liggett Jr
Technical variation in whole-genome, single-probe, one-color microarrays has some common properties that are the subject of this paper. One such property, which is evidenced in measurement of different materials in the same laboratory, involves non

Preoxidation as a general approach to suppressing orange-peel coupling in magnetic tunnel junctions

October 1, 2006
Author(s)
William F. Egelhoff Jr., Robert McMichael, Cindi L. Dennis, Mark D. Stiles, Alexander J. Shapiro, Brian B. Maranville, Cedric J. Powell
We have found that preoxidation of the bottom electrode prior to deposition of Al 2O 3 or MgO is very effective as a general approach to suppressing orange-peel coupling in magnetic tunnel junctions. When orange-peel coupling is suppressed, the hard-axis

Programmable Active Services for SIP

October 1, 2006
Author(s)
Jean Deruelle, Mudumbai Ranganathan, Douglas C. Montgomery
We have implemented a quantum key distribution (QKD) system with polarization encoding at 850 nm over 1 km of optical fiber. The high-speed management of the bit-stream, generation of random numbers and processing of the sifting algorithm are all handled

Propagation and Detection of Radio Signals Before, During, and After the Implosion of a Large Convention Center

October 1, 2006
Author(s)
Christopher L. Holloway, Galen H. Koepke, Dennis G. Camell, Catherine A. Remley, Susan A. Schima, M. McKinley, Robert T. Johnk
In this report, we investigate radio communications problems faced by emergency responders (firefighters and police) in disaster situations such as collapsed buildings. A fundamental challenge to communications into and out of large buildings is the strong

Recent Advances in High-Voltage, High-Frequency Silicon-Carbide Power Device

October 1, 2006
Author(s)
Allen R. Hefner Jr., Ryu Sei-Hyung, Hull Brett, David W. Berning, Colleen E. Hood, Jose M. Ortiz-Rodriguez, Angel Rivera-Lopez, Tam H. Duong, Adwoa Akuffo, Madelaine H. Hernandez
The emergence of High-Voltage, High-Frequency (HV-HF) Silicon-Carbide (SiC) power devices is expected to revolutionize commercial and military power distribution and conversion systems. The DARPA Wide Bandgap Semiconductor Technology (WBST) High Power
Displaying 33626 - 33650 of 73697
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