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Displaying 30326 - 30350 of 73829

Why Is Minkowski Spacetime Non-Euclidean?

October 16, 2008
Author(s)
J M. Cronkhite
The geometry of Minkowski spacetime is pseudo-Euclidean, thanks to the time component term being negative in the expression for the four dimensional interval. This fact renders spacetime geometry unintuitive and extremely difficult to visualize. I present

XRD Rietveld Simulations Y 2 O 3 - ZrO 2 Phases

October 16, 2008
Author(s)
Jennifer R. Verkouteren, Joseph M. Conny
X-ray diffraction patterns of tetragonal and cubic yttria-stabilized were simulated to test the capability of Rietveld refinement to accurately seperate the phases. The effects of peak broadening and different c/a ratios on the refinement results were

Young Modulus of a thin plate in the through-thickness direction

October 16, 2008
Author(s)
Sudook A. Kim, H M. Ledbetter
We give a new approach to obtain the through-thickness-direction along the Young modulus of a thin orthotropic plate. The method minimizes errors because eight of nine measurments are made along principal directions. To verify the method, we used a

Contact resonance atomic force microscopy for viscoelasticity

October 15, 2008
Author(s)
Donna C. Hurley, Philip Yuya, J Turner
We present a quantitative method for determining the viscoelastic properties of materials with nanometer spatial resolution. The approach is based on the atomic force acoustic microscopy (AFAM) technique that involves the resonant frequencies of the AFM

Directional Antenna for Multipath Ad Hoc Routing

October 15, 2008
Author(s)
Hamid Gharavi, Bin Hu
Multipath routing can be effectively used to maximize the utilization of network resources for real-time traffic. In mobile ad-hoc network environments, this approach can suffer from co-channel interference due to the simultaneous transmission of packets

Efficient Error Concealment for the Whole-frame Loss Based on H.264/AVC

October 15, 2008
Author(s)
Hamid Gharavi, Bo Yan
For low bit-rate video communications, each video frame usually fills the payload of a single network packet. In this situation, the loss of a packet may result in loosing the entire video frame. Currently, most existing error concealment algorithms can

Gradient Nanofiber Scaffold Libraries for Tissue Regeneration by Electrospinning

October 15, 2008
Author(s)
Carl G. Simon Jr., Murugan Ramalingam, Marian F. Young, Vinoy Thomas
Functional tissue engineering is a rapidly emerging biomedical field that holds great potential for healthcare in addressing the gap between need and availability of donor tissues and organs. The dogma in the field of tissue engineering is to harvest a

Strong Low-Frequency Quantum Correlations From a Four-Wave Mixing Amplifier

October 15, 2008
Author(s)
C F. McCormick, Alberto M. Marino, V Boyer, Paul D. Lett
Quantum-correlated light displays sub-classical noise fluctuations between frequency sidebands on a single beam (quadrature squeezing) or between the intensities or phases of different beams (two-mode squeezing). Exploiting this noise reduction can improve

Towards Information Networks to Support Composable Manufacturing

October 15, 2008
Author(s)
Mahesh Mani, Albert W. Jones, Jun H. Shin, Ram D. Sriram
Rigid, supply-chain organizational structures are giving way to highly dynamic collaborative partnerships. These partnerships will develop rapidly by composing global manufacturing resources in response to open market opportunities; and, they will disband

Tradeoffs in Building a Generic Supply Chain Simulation Capability

October 15, 2008
Author(s)
Sanjay Jain
Building a simulation model for any large complex sys-tem requires high expertise and effort. These requirements can be reduced through building generic simulation capability that includes artifacts for facilitating the development of the simulation model

Impact of Sucrose Level on Storage Stability of Proteins in Freeze-Dried Solids: II. Correlation of Aggregation Rate with Protein Structure and Molecular Mobility

October 13, 2008
Author(s)
Bingquan S. Wang, Serguei Tchessalov, Marcus T. Cicerone, Nicholas W. Warne, Michael Pikal
The purpose of this study is to investigate the impact of sucrose level on storage stability of dried proteins and thus better understand the mechanism of protein stabilization by disaccharides in lyophilized products. Three IgG1 fusion proteins and two

Single Molecule Analysis of Electrodynamically Stretched DNA in Nanochannels

October 13, 2008
Author(s)
Samuel M. Stavis, Christian H. Reccius, John T. Mannion, Larry P. Walker, Harold G. Craighead
A rapid (~20 ms) and precise (~110 nm) analytical method is presented for stretching and interrogating single DNA molecules. Conformation, length, speed and fluorescence intensity measurements are obtained simultaneously. This confluence is a step forward

Contactless Differential Conductivity Detection

October 12, 2008
Author(s)
Gordon A. Shaw, David J. Ross, Steven E. Fick, Wyatt N. Vreeland
We propose a new technique, contactless differential conductivity detection (CDCD,) to improve the detection limit of contactless conductivity detection for capillary and microchannel electrophoresis. By exploiting a 3-electrode differential configuration

Oxide Reliability of SiC MOS Devices

October 12, 2008
Author(s)
Liangchun (. Yu, Kin P. Cheung, Jason P. Campbell, John S. Suehle, Kuang Sheng
Silicon carbide possesses excellent material properties for high temperature, high frequency and high power applications. Among all the device structures, MOSFET has advantages such as low gate leakage current, easier device control etc., and therefore

Bilateral comparison on polarization mode dispersion between KRISS and NIST

October 10, 2008
Author(s)
Seung-kwan Kim, Paul A. Williams
We made an international bilateral comparison on polarization mode dispersion between KRISS and NIST. Three mode-coupled artifacts were used for comparison. The average values of differential group delay measured by both institutes agreed well within their

Reanalysis of BASE Ventilation Data

October 10, 2008
Author(s)
Andrew K. Persily
In 2004, the National Institute of Standards and Technology (NIST) published an analysis of the ventilation data collected as part of the U.S. EPA Building Assessment Survey and Evaluation (BASE) study [1]. That analysis provided a unique dataset of office

Sounds of Atoms: Life in Science

October 10, 2008
Author(s)
Stephan J. Stranick
Early in setting up our nanoscience laboratory at Penn State, we were frustrated because we could not peer into the tunneling junctions of our scanning tunneling microscopes (STMs) to see what the atoms were doing. We were particularly vexed when singular

Calibration of a Radiance Standard for the NPP/OMPS Instrument

October 9, 2008
Author(s)
Bettye C. Johnson, James J. Butler, Scott J. Janz, Robert D. Saunders, John W. Cooper, Matthew G. Kowalewski, R Barnes
In June 2007, a spherical integrating source was calibrated in the National Aeronautics and Space Administration(NASA) Goddard Space Flight Center’s (GSFC) Calibration Facility as part of the prelaunch characterization program for the NPOESS Preparatory
Displaying 30326 - 30350 of 73829
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