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Chemistry

Chemical engineering & processing

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Displaying 326 - 350 of 781

Measurement and validation of cell-based assays with microfluidics at the National Institute of Standards and Technology (NIST)

August 1, 2012

Author(s)

Gregory A. Cooksey, Francisco J. Atencia, Samuel P. Forry

Verification of the Back-EMF Method for Piston Velocity Measurements

July 10, 2012

Author(s)

Ray Radebaugh, Michael A. Lewis, Peter E. Bradley

Linear compressors are used to drive pulse tube or Stirling cryocoolers, and they can be used as expanders in place of inertance tubes when inertance tubes cannot provide sufficient phase shifts between flow and pressure. Commercial linear compressors

Kinetics of H atom attack on unsaturated hydrocarbons using spectral uncertainty propagation and minimization techniques

July 2, 2012

Author(s)

David A. Sheen, Claudette M. Rosado-Reyes, Wing Tsang

Unsaturated hydrocarbons are an important component of hydrocarbon fuels and intermediates in their oxidation. Under rich conditions, H atom attack is one of the principle pathways of the decomposition of these unsaturated compounds. Consequently, it is

A Glowing Future for Lab on a Chip Testing Standards

June 28, 2012

Author(s)

Samuel M. Stavis

Testing standards are more fundamental from a metrological perspective and less controversial from an industrial perspective than product standards, representing a path of less resistance towards the standardization and commercialization of lab on a chip

How nanorough is rough enough?

June 21, 2012

Author(s)

Konrad Rykaczewski, William A. Osborn, Jeff Chinn, Marlon L. Walker, John H. Scott, Wanda Jones, Chonglei Hao, Shuhuai Yao, Zuankai Wang

Surfaces which evince superhydrophobic properties during water condensation have a potential to dramatically enhance energy efficiency in power generation and desalination systems. Although various such surfaces have been reported, their development has

Fabrication of Microelectrodes on Polyester Membranes for Dielectrophoretic Cell Capture

June 18, 2012

Author(s)

Conni Hanke, Petra S. Dittrich, Darwin Reyes-Hernandez

We present a new system for cell capturing on permeable polyester (PET) membranes using dielectrophoretic forces. For the first time gold microelectrodes were fabricated on PET membranes using conventional photolithographic techniques. Their

Engineering and Analysis of Surface Interactions in a Microfluidic Herringbone Micromixer

May 18, 2012

Author(s)

Thomas P. Forbes, Jason G. Kralj

We developed a computational model and theoretical framework to investigate the geometrical optimization of particle-surface interactions in a herringbone micromixer. The enhancement of biomolecule- and particle-surface interactions in microfluidic devices

State-of-the-Art Comparability of Corrected Emission Spectra-Part II: Peer-toPeer Assessment of Calibration Performance Using Spectral Fluorescence Standards

February 28, 2012

Author(s)

Paul C. DeRose, Joanne C. Zwinkels, Bernd Ebert

The tremendous growth of fluorescence applications in the life and material sciences has proceeded largely without sufficient concern for the reliability and uncertainties related to the characterization and performance validation of fluorescence

Observation of vapor density enhancement of a rare-earth metal-halide in the temperature range relevant to metal-halide lamps

February 22, 2012

Author(s)

John J. Curry, E. G. Estupinan, W. P. Lapatovich, Albert Henins, S. D. Shastri

The total vapor-phase densities of Dy in equilibrium with a DyI$_3$/InI condensate and Tm in equilibrium with a TmI$_3$/TlI condensate have been measured for temperatures between 900 K and 1400 K. The measurements show strong enhancements in rare-earth

Microfluidic magnetophoretic separations of immunomagnetically labeled rare mammalian cells

February 13, 2012

Author(s)

Thomas P. Forbes, Samuel P. Forry

Immunomagnetic isolation and magnetophoresis in microfluidics have emerged as viable techniques for the separation, fractionation, and enrichment of rare cells. Here, we present the development and characterization of a microfluidic system that

Refrigeration of separate, user-supplied payloads with Normal-Insulator-Superconductor tunnel junctions

January 24, 2012

Author(s)

Peter J. Lowell, Galen C. O'Neil, Jason M. Underwood, Joel N. Ullom

Normal metal - Insulator - Superconductor (NIS) tunnel junctions can be used to selectively remove the hottest elec- trons in the normal metal, thereby causing it to cool. NIS tunnel junctions have already been used to cool lithograph- ically integrated

A robust diffusion-based gradient generator for dynamic cell assays.

January 1, 2012

Author(s)

Francisco J. Atencia, Gregory A. Cooksey, Laurie E. Locascio

This manuscript describes a new method to generate purely diffusive chemical gradients that can be modified in time. The device is simple in its design and easy to use, which makes it amenable to study biological processes that involve static or dynamic

Spectroscopy of the methane N3 Band with an accurate midinfrared coherent dual-comb spectrometer

December 28, 2011

Author(s)

Esther Baumann, Fabrizio R. Giorgetta, William C. Swann, Alexander M. Zolot, Ian R. Coddington, Nathan R. Newbury

We demonstrate a high-accuracy dual-comb spectrometer centered at 3.4 υm. The amplitude and phase spectra of the P,, Q, and partial R branches of the methane Ņ3 band are measured at 25 to 100 MHz point spacing with resolution under 10 kHz and a signal-to

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