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Displaying 31001 - 31025 of 73830

Electric field control of the magnetic state in Bi Fe O3 single crystals

May 12, 2008
Author(s)
Seoungsu Lee, William D. Ratcliff, S.-W. Cheong, V. Kiryukhin
Single crystals of multiferroic BiFeO 3 were investigated using neutron scattering. Application of an electric field reversibly switches ferroelastic domains, inducing changes in the magnetic structure which follows rotation of the structural domains. In

How the User can Improve Fingerprint Image Quality

May 12, 2008
Author(s)
Mary F. Theofanos, Ross J. Micheals, Shahram Orandi, Brian C. Stanton, Nien F. Zhang
Traditionally the biometric field has viewed the user as a passive source of the biometric sample rather than an interactive component of the biometric system. But fingerprint image quality is highly dependent on the human computer interaction and

Reference 0 /45 Colorimeter

May 12, 2008
Author(s)
Maria E. Nadal
The Optical Technology Division at the National Institute of Standards and Technology (NIST) has developed a new instrument designed to measure the surface color of reflective, non-fluorescent samples at a geometry of 0 illumination angle and 45 viewing

Sensor Network based on IEEE 1451.0 and IEEE p1451.2-RS232

May 12, 2008
Author(s)
Yuyin Song, Kang B. Lee
The Institute of Electrical and Electronics Engineers (IEEE) 1451 family of standards defines a set of common communication interfaces for connecting smart transducers (sensors or actuators) to microprocessor-based systems, instruments, and networks in a

Subspace Approximation of Face Recognition Algorithms: An Empirical Study

May 12, 2008
Author(s)
P J. Phillips, Pranab Mohanty, Sudeep Sarkar, Rangachar Kasturi
We present a theory for constructing linear subspace approximations to face recognition algorithms and empirically demonstrate that a surprisingly diverse set of face recognition approaches can be approximated well using a linear model. A linear model

Design Secure and Application-Oriented VANET

May 11, 2008
Author(s)
Yi Qian, Nader Moayeri
Vehicular ad hoc network (VANET) is recognized as an important component of Intelligent Transportation Systems. The main benefit of VANET communication is seen in active safety systems, which target to increase safety of passengers by exchanging warning

Impact of Signaling Load on the UMTS Call Blocking/Dropping

May 11, 2008
Author(s)
Yi Qian, David Tipper, Saowaphak Sasanus
Radio resources in the third generation (3G) wireless cellular networks (WCNs) such as the universal mobile telecommunications system (UMTS) network is limited in term of soft capacity. The quality of a signaling service transmission depends on various

Usability Testing of Height and Angles of Ten-Print Fingerprint Capture

May 11, 2008
Author(s)
Mary F. Theofanos, Brian C. Stanton, Charles L. Sheppard, Ross J. Micheals, John W. Wydler II, Nien F. Zhang, Lawrence Nadel, William Rubin
As the deployment of biometric technologies such as fingerprints has become more widespread in government applications there is an increased awareness of the human-computer interaction that such technologies involve. User behavior can impact operational

Ab Initio Studies of the Spin-Transfer Torque in Tunnel Junctions

May 9, 2008
Author(s)
Christian Heiliger, Mark D. Stiles
We calculate the spin-transfer torque in Fe/MgO/Fe tunnel junctions and analyze the results in comparison to all-metallic junctions. We show that the spin-transfer torque is interfacial in the ferromagnetic layer to a greater degree than in spin-valve

The relationship between local order, long range order, and sub-bandgap defects in hafnium oxide and hafnium silicate films

May 9, 2008
Author(s)
D. H. Hill, Robert A. Bartynski, Nhan Van Nguyen, Albert Davydov, Deane Chandler-Horowitz, Martin M. Frank
We have measured X-ray absorption spectra (XAS) at the oxygen K-edge for hafnium oxide (HfO2) films grown by chemical vapor deposition (CVD) and atomic layer deposition (ALD), as well as hafnium silicate (HfSiO) films grown by CVD.  The XAS results are

Investigation of Electron Hole Recombination-Activated Partial Dislocations and Their Behavior in 4H-SiC Epitaxial Layers

May 8, 2008
Author(s)
Yi Chen, Ning Zhang, M Dudley, JOSHUA CALDWELL, Kendrick Liu, ROBERT STAHLBUSH, XIANRONG HUANG, A T. Macrander, David R. Black
Electron hole recombination-activated partial dislocations in 4H silicon carbide homoepitaxial layers and their behavior have been studied using synchrotron X-ray topography and electroluminescence. Stacking faults whose expansion was activated by electron

Introducing Sustainability Early into Manufacturing Process Planning

May 7, 2008
Author(s)
Mahesh Mani, Kevin W. Lyons, Sudarsan Rachuri, Eswaran Subrahmanian, Ram D. Sriram
In response to the global trend towards implementing sustainable manufacturing practices, we put forth an exploratory approach that uses energy monitoring as a means to introduce sustainability criteria early into manufacturing process planning and

THE ROLE OF CAMERA NETWORKS IN CONSTRUCTION AUTOMATION

May 7, 2008
Author(s)
Itai Katz, Kamel S. Saidi, Alan M. Lytle
Due to the complexity and variability of capital construction sites, real-time monitoring remains an elusive goal. As unit price continues to fall, camera networks are becoming increasingly viable sensing modalities. The benefits of combining multiple

Detection-time-bin-shift Polarization Encoding Quantum Key Distribution System

May 6, 2008
Author(s)
Lijun Ma, Tiejun Chang, Xiao Tang
A detection-time-bin-shift scheme for polarization encoding QKD is proposed. This scheme can reduce cost and overcome the security loss caused by dead-time and the unbalanced characteristics of detectors. This scheme is experimentally demonstrated with the

Directional Routing Protocols for Ad Hoc Networks

May 6, 2008
Author(s)
Hamid Gharavi, Bin Hu
This paper presents a directional routing approach for multihop ad-hoc networks, which has been applied to two on-demand routing protocols: namely Dynamic Source Routing (DRS) and Ad Hoc On-Demand Distance Vector Routing (AODV). Both DSR-based and AODV

Frequency evaluation of the doubly forbidden 1 S 0 - 3 P 0 transition in bosonic 174 Yb

May 6, 2008
Author(s)
Nicola Poli, Zeb Barber, Nathan D. Lemke, Christopher W. Oates, Tara Fortier, Scott Diddams, Leo W. Hollberg, James C. Bergquist, Anders Brusch, Steven R. Jefferts, Thomas P. Heavner, Tom Parker
We report an uncertainty evaluation of an optical lattice clock based on the 1S 0 – 3P 0 transition in the bosonic isotope 174Yb using magnetically induced spectroscopy. The uncertainty due to systematic effects has been reduced to less than 0.8Hz, which

Close Proximity Self-Aligned Shadow Mask for Sputter Deposition Onto a Membrane or Cavity

May 5, 2008
Author(s)
Ravi Kummamuru, L Hu, Lawrence P. Cook, M Y. Efremov, E A. Olson, Martin L. Green, L H. Allen
In this paper we report fabrication of a shadow mask designed for sputtering into cavities or on the back surface of freestanding silicon nitride (SiNx) membranes. Sputter deposition through a shadow mask typically results in spreading of the deposited
Displaying 31001 - 31025 of 73830
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