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Displaying 20726 - 20750 of 73751

Magnetically generated spin-orbit coupling for ultracold atoms

September 18, 2013
Author(s)
Brandon M. Anderson, Ian B. Spielman, Gediminas Juzeliunas
We present a new technique for producing two and three dimensional Rashba-type spin-orbit coupling for ultra cold atoms without involving light. The method relies on a sequence of pulsed inhomogeneous magnetic fields imprinting suitable phase gradients on

On integer solutions of x^4+y^4-2z^4-2w^4=0

September 18, 2013
Author(s)
Dustin Moody, Arman S. Zargar
In this article, we study the quartic Diophantine equation x^4+y^4-2z^4-2w^4=0. We find non-trivial integer solutions. Furthermore, we show that when a solution has been found, a series of other solutions can be derived. We do so using two different

Related-Key Slide Attacks on Block Ciphers with Secret Components

September 18, 2013
Author(s)
Meltem Sonmez Turan
Lightweight cryptography aims to provide sufficient security with low area/power/energy requirements for constrained devices. In this paper, we focus on the lightweight encryption algorithm specified and approved in NRS 009-6-7:2002 by Electricity

Secure Domain Name System (DNS) Deployment Guide

September 18, 2013
Author(s)
Ramaswamy Chandramouli, Scott W. Rose
The Domain Name System (DNS) is a distributed computing system that enables access to Internet resources by user-friendly domain names rather than IP addresses, by translating domain names to IP addresses and back. The DNS infrastructure is made up of

Porosity and Its Measurement

September 17, 2013
Author(s)
Laura Espinal
Numerous approaches have been applied for measuring the porosity of materials. The most common techniques are based on gas sorption, liquid intrusion, microscopy, and X-ray and neutron scattering. Each technique provides a characteristic value of porosity

Spectral response of an upconversion detector and spectrometer

September 17, 2013
Author(s)
Paulina S. Kuo, Oliver T. Slattery, Yong-Su Kim, Jason S. Pelc, M. M. Fejer, Xiao Tang
We theoretically and experimentally investigate the spectral response of an upconversion detector and discuss implications for its use as an infrared spectrometer. Upconversion detection is based on high-conversion-efficiency sum-frequency generation (SFG)

Spiral Resonators for On-Chip Laser Frequency Stabilization

September 17, 2013
Author(s)
Scott A. Diddams, Hansuek Lee, Myoung-Gyun Suh, Tong Chen, Jiang Li, Kerry J. Vahala
Frequency references are indispensable to radio, microwave, and time keeping systems, with far reaching applications in navigation, communi- cation, remote sensing, and basic science. Over the past decade there has been an optical revo- lution in time

Effects of Desialylation on Human alpha1-Acid Glycoprotein-Ligand Interactions

September 16, 2013
Author(s)
Richard Y. Huang, Jeffrey W. Hudgens
Human α1-Acid Glycoprotein (AGP), an acute phase glycoprotein, exists predominantly in blood. With its ability to bind basic, lipophilic, and acidic drugs, AGP has served as a drug carrier. It has been shown that the carbohydrate composition of AGP changes

GPS Integrity Architecture Opportunities

September 16, 2013
Author(s)
Marc A. Weiss, Calvin Miles, Karl J. Kovach, John Dobyne, Karen Van Dyke
The Global Positioning System (GPS) integrity architecture forms the basis for several GPS integrity augmentation systems, most notably, the Wide Area Augmentation System (WAAS), Receiver-based Autonomous Integrity Monitoring (RAIM) and its proposed

Real-Time Monitoring: Augmenting Building Information Modeling with 3D Imaging Data to Control Drilling for Embeds into Reinforced Concrete Bridge Decks

September 16, 2013
Author(s)
Manu Akula, Robert R. Lipman, Marek Franaszek, Geraldine Cheok, Kamel Saidi, Vineet Kamat
A major contributing factor attributed to accidents in construction is the lack of hazard recognition due to limited visibility that characterizes construction projects. Real-time monitoring systems that utilize context aware computing techniques

A Missing Link in the Cascade Formation of High Symmetry Fullerene Cages

September 15, 2013
Author(s)
Dan Bearden, Jianyuan Zhang, Harry C. Dorn
Before the discovery of graphene, many versions of a “bottom-up” fullerene formation mechanism had been advanced starting with carbide (C2) that forms small carbon cluster chains and rings. However, in recent years evidence is emerging suggesting a “top

Quantum simulation and many-body physics with hundreds of trapped ions

September 14, 2013
Author(s)
John J. Bollinger, Joseph W. Britton, Brian C. Sawyer
By employing forces that depend on the internal electronic state (or spin) of an atomic ion, the Coulomb potential energy of a trapped ion crystal can be modified in a spin-dependent way to mimic effective quantum spin Hamiltonians. We use simple models to

An atomic clock with 10 -18 instability

September 13, 2013
Author(s)
Andrew D. Ludlow, Nathan M. Hinkley, Jeffrey A. Sherman, Nate B. Phillips, Marco Schioppo, Nathan D. Lemke, Kyle P. Beloy, M Pizzocaro, Christopher W. Oates
Atomic clocks have been transformational in science and technology, leading to innovations such as global positioning, advanced communications, and tests of fundamental constant variation. Next-generation optical atomic clocks can extend the capability of

A Consilience-based Approach to Engineering Services in Global Supply Chains

September 12, 2013
Author(s)
Albert W. Jones
Technology life cycles are becoming shorter as is the time for those technologies to become ubiquitous in the society. The Industrial Revolution took about 150 years; but the computer revo-lution took only 50 years. Cell phones, which hit the market in the

Feeling Small: Exploring the tactile perception limits

September 12, 2013
Author(s)
Lisa Skedung, Martin Arvidsson, Jun Y. Chung, Christopher Stafford, Birgitta Berglund, Mark W. Rutland
The human finger is exquisitely sensitive in distinguishing different materials, but the question remains as to what length scales are capable of being discriminated in active touch? We combine psychophysical approaches with materials science to

Improvements to the Johnson Noise Thermometry System for Measurements at 505 800 K

September 12, 2013
Author(s)
Weston L. Tew, Kazuaki Yamazawa, Samuel P. Benz, Alessio Pollarolo, Horst Rogalla, Paul D. Dresselhaus
The National Institute of Standards and Technology (NIST) is currently using Johnson noise thermometry (JNT) to determine the deviations of the International Temperature Scale of 1990 (ITS-90) from the thermodynamic temperature in the range of 505–933 K

Statistical Methods for Change-Point Detection in Surface Temperature Records

September 12, 2013
Author(s)
Adam L. Pintar, Antonio M. Possolo, Nien F. Zhang
We describe several statistical methods to detect possible change-points in a time series of values of surface temperature measured at a meteorological station, and to assess the statistical significance of such changes, taking into account the natural
Displaying 20726 - 20750 of 73751
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