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Displaying 36451 - 36475 of 74045

Combinatorial Synthesis and Dissolution Testing of Polyanhydride Copolymers

August 28, 2005
Author(s)
Brandon M. Vogel, Naomi Eidelman, Surya Mallapragada, Balaji Narasimhan
A linearly varying compositional library of 100 different polyanhydride randomcopolymers was designed, fabricated, and characterized within a few hours. A subset of this library was chosen and a substrate was designed and fabricated to enable the synthesis

Microfluidic Platform for Combinatorial Measurements of Polymer Particles

August 28, 2005
Author(s)
Zuzanna T. Cygan, Susan E. Barnes, Kathryn L. Beers, Eric J. Amis
Organic-stable microfluidic devices are used for combinatorial measurements of polymerization reactions on chip. Formulation, processing, and measurement are combined on one chip device for the generation of combinatorial polymer libraries. A monomer /

Spectroscopic Monitoring of Polymerization in Microfluidic Channels

August 28, 2005
Author(s)
Susan E. Barnes, Anthony J. Bur, Zuzanna T. Cygan, Kathryn Beers, Eric J. Amis
At NIST Combinatorial Methods Center (NCMC) we are interested in the construction of material libraries that explore a range of polymer chemistries and properties. In this study we extend on-chip application of spectroscopic techniques to the analysis of

Characterization of Optical Traps Using On-Line Estimation Methods

August 26, 2005
Author(s)
Jason J. Gorman, Thomas W. LeBrun, et al
System identification methods are presented for the estimation of the characteristic frequency of an optically trapped particle. These methods are more amenable to automated on-line measurements and are believed to be less prone to erroneous results

Uncertainties in Scaling Factors for Ab Intio Vibrational Frequencies

August 26, 2005
Author(s)
K Irikura, R Johnson, Raghu N. Kacker
The n-qubit concurrence canonical decomposition (CCD) is a generalization of the two-qubit canonical decomposition SU(4)=[SU(2) (x) SU(2)] ? [SU(2) (x) SU(2)], where ? is the commutative group which phases the maximally entangled Bell basis. A prequel

A Microstructure Fiber Two Photon Source With Conjugate Laser Pumps

August 25, 2005
Author(s)
Jingyun Fan, Alan L. Migdall, L Wang
We present a systematic experimental study of generating correlated photon pairs using a reversed degenerate four-wave mixing process. By overlapping a pair of parallel- (or cross-) polarized laser pump pulses at conjugate frequencies in a microstructure

Investigation of 3D Tyrosine-Derived Polycarbonate Scaffold for Tissue Engineering

August 25, 2005
Author(s)
J S. Stephens, Tithi Dutta Roy, Joy P. Dunkers, Aarti Rege, J Kohn
A library of tyrosine-derived polycarbonates of have been developed that share a structurally identical backbone with a rich chemical and structural diversity, which depend solely on the pendent ester substituent (Scheme 1).1 The physical and chemical

Progress Toward the Second-Generation Atomic Fountain Clock at NIST

August 23, 2005
Author(s)
Elizabeth Donley, M O. Tataw, F Levi, Steven R. Jefferts, Thomas P. Heavner
We present results on the performance of two important subsystems for NIST -F2 -the second-generation atomic fountain clock at NIST. Firstly, we demonstrate the efficient capture of cesium atoms from a low-velocity intense source (LVIS) of atoms into an

Correction of Stray Light in Spectrographs: Implications for Remote Sensing

August 22, 2005
Author(s)
Yuqin Zong, Steven W. Brown, Bettye C. Johnson, Keith R. Lykke, Yoshihiro Ohno
Spectrographs are used in a variety of applications in the field of remote sensing for radiometric measurements due to the benefits of measurement speed, sensitivity, and portability. However, spectrographs are single grating instruments that are

Implementing Electronic Materials Data Exchange

August 18, 2005
Author(s)
Eric D. Simmon, Arthur Griesser
Adding automation to your materials declaration process will set, simplify, and streamline the materials declaration process. Whether your company is a component supplier, board manufacturer or assembly services company, the structure of how you manage

Dynamic Modeling and Vibration Analysis of a UHV Scanning Tunneling

August 17, 2005
Author(s)
Sumanth B. Chikkamaranahalli, R. R. Vallance, Bradley N. Damazo, Richard M. Silver, James D. Gilsinn
Techniques based on scanning probe microscopy (SPM) are used to fabricate surface structures with dimensions ranging from 10 - 100mm. These structures have been fabricated and imaged using a scanning tunneling microscope (STM), and the STM requires the tip

Linear and Generalized Linear Models for Analyzing Face Recognition Performance

August 17, 2005
Author(s)
J. R. Beveridge, Geof H. Givens, Bruce A. Draper, P. Jonathon Phillips
This paper introduces linear models (LM), generalized linear models (GLM), and generalized linear mixed models (GLMM) for analyzing performance of face recognition algorithms. These three statistical techniques are applied to analyzing the affect of

Microfluidic interfacial tensiometry

August 17, 2005
Author(s)
Steven D. Hudson, J Cabral, Kathryn L. Beers, W Goodrum, Eric J. Amis
A microfluidic approach to measure interfacial tension of immiscible fluids rapidly is reported. This method rests upon quantitative real-time analysis of two-phase flow and drop-shape dynamics. Drops of prescribed dimension and spacing are produced
Displaying 36451 - 36475 of 74045
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