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Displaying 726 - 750 of 3124

Broadband Dielectric Spectroscopy of Ruddlesden-Popper Sr(n+1)Ti(n)O(3n+1) (n= 1, 2, 3) Thin Films

January 29, 2009
Author(s)
Nathan D. Orloff, Ichiro Takeuchi, James C. Booth, Dazhen Gu, Jordi Mateu, C. J. Fennie, K. M. Rabe, W Tian, D.G. Schlom
We explore the frequency dependent permittivity of Ruddlesden-Popper series Sr(n+1)Ti(n)O(3n+1) (n= 1, 2, 3) thin films as a function of temperature and dc electric-field. Interdigitated capacitors and coplanar waveguides are used to extract the frequency

Detection and segmentation of concealed objects in terahertz images

December 1, 2008
Author(s)
Xilin Shen, Charles Dietlein, Erich N. Grossman, Zoya Popovic, Francois Meyer
Terahertz imaging has been shown to successfully detect objects concealed underneath clothing, by measuring the radiometric temperatures of different objects on a human subject. The goal of this work is to automatically detect and segment concealed objects

Controlled Transport of Magnetic Particles Using Soft Magnetic Patterns

November 20, 2008
Author(s)
Richard Conroy, Gary Zabow, John M. Moreland, Alan P. Koretsky
Inspired by magnetic bubble memory technology, we demonstrate the temporal and spatial manipulation of superparamagnetic beads guided by soft magnetic patterns in a rotating magnetic field. Soft magnetic structures allow complex and repetitive tasks to be

Using Reverberation Chambers to Determine the Shielding Effectiveness of Physically Small, Electrically Large Enclosures/Cavities

November 20, 2008
Author(s)
Christopher L. Holloway, David A. Hill, Marco Sandroni, John M. Ladbury, Jason B. Coder, Galen H. Koepke, Andrew C. Marvin
With the proliferation of small electric devices in recent years, along with various other applications, there is a growing need to test and determine the shielding properties or shielding effectiveness (SE) of physically small (but electrically large)

HF Proximity RFID Electromagnetic Emissions and Performance

November 16, 2008
Author(s)
Jeffrey R. Guerrieri, David R. Novotny, Catherine A. Remley, Michael H. Francis
We examined the emissions, and performance of commercial High-Frequency Radio Frequency Identification (HF RFID) systems to interrupt and eavesdropping. These proximity RFID systems are used in an increasing number of financial, identification, and access

Near-Field Spherical Scanning: Uncertainties in Test-Zone Field Measurements

November 16, 2008
Author(s)
Randy Direen, Ronald C. Wittmann, Michael H. Francis
The electromagnetic field within a test volume can be measured using spherical scanning techniques. Characterization of the field within the sphere requires compensation for probe-pattern effects. We provide a simple uncertainty analysis to estimate

HF RFID Electromagnetic Emissions and Performance

November 4, 2008
Author(s)
David R. Novotny, Jeffrey R. Guerrieri, Michael H. Francis, Catherine A. Remley
We examined the emissions, and susceptibility of commercial High-Frequency Radio Frequency Identification (HF proximity RFID) systems to interrupt and eavesdropping. RFID systems are being used in an increasing number of financial, identification, and

Probability Density Function of Power Received in a Reverberation Chamber

November 2, 2008
Author(s)
David A. Hill
The probability density function (PDF) for the power received by an arbitrary antenna in a reverberation chamber has been shown to be exponential. The purpose of this correspondence is to provide a direct maximum-entropy derivation of the PDF that deals

In-Situ Torque Magnetometry: Magnetic Coupling in Fe/Cr/Fe Thin-Film Systems

October 31, 2008
Author(s)
Dong-Hoon Min, S. B. Lee, John M. Moreland
We have developed an ultra-sensitive torque magnetometer tailored to the study of thin-film interface magnetism and interlayer magnetic exchange coupling. The magnetometer was composed of an optical-fiber interferometer and a customized silicon cantilever
Displaying 726 - 750 of 3124
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