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Search Publications

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Displaying 28551 - 28575 of 73830

Observation of a 2D Bose-gas: from thermal to fractured quasi-condensate to superfluid

May 1, 2009
Author(s)
Pierre Clade, Changhyun Ryu, Anand Ramanathan, Kristian Helmerson, William D. Phillips
This paper presents experimental results on a Bose gas in a quasi-2D geometry near the Berezinskii,Kosterlitz and Thouless (BKT) transition temperature. By measuring the density profile, in situ and after time of flight, and the coherence length of the gas

Plant and fungal Fpg homologs are formamidopyrimidine DNA glycosylases but not 8-oxoguanine DNA glycosylases

May 1, 2009
Author(s)
Scott D. Kathe, Ramiro Barrantes-Reynolds, Pawel Jaruga, Michael Newton, Cynthia Burrows, Viswanath Bandaru, Miral M. Dizdar, Jeffrey Bond, Susan Wallace
Formamidopyrimidine DNA glycosylase (Fpg) and endonuclease VIII (Nei) share an overall common three dimensional structure and primary amino acid sequence in conserved structural motifs but have different substrate specificities, with bacterial Fpg proteins

Potential Primary Measurement Tool for the Quantification of DNA

May 1, 2009
Author(s)
Ryan G. Brennan, Savelas A. Rabb, Marcia J. Holden, Michael R. Winchester
An automated sample introduction system, utilizing a demountable direct injection high efficiency nebulizer (d DIHEN), is successfully incorporated for the first time with an inductively coupled plasma optical emission spectrometer (ICP-OES) for the

Predicting the Permeability of Pervious Concretes from Planar Images

May 1, 2009
Author(s)
Milani S. Sumanasooriya, Dale P. Bentz, Narayanan Neithalath
This paper discusses the reconstruction of three-dimensional material structures of pervious concretes using two-dimensional digital images obtained from actual specimens, and computational permeability predictions using these reconstructed three

Quantitative Measurement of the Polydispersity in the Extent of Functionalization of Glass Forming Resorcinarenes

May 1, 2009
Author(s)
William E. Wallace, Kathleen M. Flynn, Charles M. Guttman, David L. VanderHart, Vivek M. Prabhu, Anuja De Silva, Nelson Felix, Christopher K. Ober
The polydispersity in the degree of functionalization for two calix[4]resorcinarenes was determined by measuring their molecular mass distribution with matrix-assisted laser desorption/ionization time of flight mass spectrometry. A mathematical method for

Single-photon Sources

May 1, 2009
Author(s)
Matthew T. Rakher
Quantum-dot-based single-photon sources are fast and efficient and remain at the forefront of candidates for use in quantum information schemes.

Software Assurance Using Structured Assurance Case Models

May 1, 2009
Author(s)
Thomas R. Rhodes, Frederick E. Boland Jr., Elizabeth N. Fong, Michael J. Kass
Software assurance is an important part of the software development process to reduce risks and ensure that the software is dependable and trustworthy. Software defects and weaknesses can often lead to software errors and failures and to exploitation by

The IMS 2009 "Bonus Issue"

May 1, 2009
Author(s)
Catherine A. Remley
This is an Editorial for a special issue of IEEE Microwave Magazine devoted to the International Microwave Symposium. Kate Remley, the Editor-in-Chief, and two co-editors write about this issue.

Thermodynamics of the Hydrolysis Reactions of +--D-galactose 1-phosphate, sn-glycerol 3-phosphate, 4 nitrophenyl phosphate, phosphocreatine, and 3-phospho-D-glycerate

May 1, 2009
Author(s)
Robert N. Goldberg, Brian E. Lang, Catherine T. Lo, David J. Ross, Yadu D. Tewari
Microcalorimetry, high-performance liquid chromatography, and an enzymatic assay have been used to conduct a thermodynamic investigation of five phosphate hydrolysis reactions: α-D-galactose 1 phosphate(aq) + H2O(l) = D-galactose(aq) + orthophosphate(aq)

X-ray measurements at high-power lasers

May 1, 2009
Author(s)
Lawrence T. Hudson, C.I Szabo, Paul Indelicato, G.E. Gumberidze, G Holland, John F. Seely, Albert Henins, M Audebert, S. Bastiani-Ceccotti, E. Tabakhoff, E. Brambrink
Conversion efficiencies of laser light into K x-ray radiation are used to characterize laser-solid interactions e.g. in measurements with back-lighter targets in Inertial Confinement Fusion research or in ultra short x-ray science where ultra short laser

1310 nm Differential Phase Shift QKD System Using Superconducting Single Photon Detectors

April 30, 2009
Author(s)
Xiao Tang, Lijun Ma, Sae Woo Nam, Burm Baek, Oliver T. Slattery, Alan Mink, Hai Xu, Tiejun Chang
We have implemented a differential-phase-shift (DPS) quantum key distribution (QKD) system at 1310 nm with superconducting single photon detectors (SSPD). The timing jitter of the SSPDs is small and its dark counts are very low. 1310 nm is an ideal quantum

Directions in Security Metrics Research

April 30, 2009
Author(s)
Wayne Jansen
More than 100 years ago, Lord Kelvin insightfully observed that measurement is vital to deep knowledge and understanding in physical science. During the last few decades, researchers have made various attempts to develop measures and systems of measurement

Imaging Response of Optical Microscopes Containing Angled Micromirrors

April 30, 2009
Author(s)
Andrew J. Berglund, Matthew D. McMahon, Jabez J. McClelland, James A. Liddle
We describe the aberrations induced by introducing micromirrors into the object space of a microscope. These play a critical role in determining the accuracy of recent three-dimensional particle tracking methods based on such devices.

In-plane bias in a patterned ferromagnetic/antiferromagnetic bilayer

April 30, 2009
Author(s)
Yury P. Kabanov, Valerian I. Nikitenko, Oleg A. Tikhomirov, William F. Egelhoff Jr., Alexander J. Shapiro, Robert D. Shull
Exchange bias in bi- and multilayer magnetic systems is usually ascribed to the existence of transient magnetic structures at the interfaces between adjacent layers. Here, we report the observation of a similar phenomenon in the lateral direction

Practical long-distance quantum key distribution system using decoy levels

April 30, 2009
Author(s)
Danna Rosenberg, Charles G. Peterson, Jim A. Harrington, Patrick R. Rice, N. Dallman, K. T. Tyagi, K. P. McCabe, Sae Woo Nam, Burm Baek, Robert Hadfield, Richard J. Hughes, Jane E. Nordholt
Quantum key distribution (QKD) has the potential for widespread real-world applications, but no secure long-distance experiment has demonstrated the truly practical operation needed to move QKD from the laboratory to the real world due largely to

Prediction of Feshbach resonances from three input parameters

April 30, 2009
Author(s)
Thomas M. Hanna, Eite Tiesinga, Paul S. Julienne
We have developed a model of Feshbach resonances in gases of ultracold alkali metal atoms using the ideas of quantum defect theory. Our model requires just three parameters - the singlet and triplet scattering lengths, and the coefficient of the long range

Probabilistic Call Admission Control Algorithm for WLAN in a Heterogeneous Wireless Environment

April 30, 2009
Author(s)
Nicolas Chevrollier, David W. Griffith, Nada T. Golmie, SuKyoung Lee, Kyungsoo Kim, Hong Kunho, YoonHyuk Kim
In an integrated WLAN and cellular network, if all mobile users whose connections originate in the cellular network migrate to the WLAN whenever they enter the double coverage area, the WLAN will be severely congested and its users will suffer from
Displaying 28551 - 28575 of 73830
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