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Chemistry

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  • Published Date
Displaying 1201 - 1225 of 1924

Spin-on Nanoparticle Tin Oxide for Microhotplate Gas Sensors

June 1, 2001
Author(s)
Richard E. Cavicchi, R M. Walton, M I. Aquino-Class, J D. Allen, B. Panchapakesan
A colloidal suspension of tin oxide nanoparticles is used to prepare a highly sensitive gas sensing film on a microhotplate. Fabrication consists of spin-coating the solution over an array of micromachined hotplates and annealing. A thermolithographic

Radioactive Particle Analysis by Digital Autoradiography

May 1, 2001
Author(s)
Cynthia J. Zeissler, Richard M. Lindstrom, J P. McKinley
We have been exploring ways to evaluate the activity of radioactive particles that have been detected by phosphor plate digital autoradiography based on photostimulated luminescence (PSL). A PSL system with 25υ pixel digitization has been applied to

Special Ultrasonic Flowmeters for In-Situ Diagnosis of Swirl and Cross Flow

May 1, 2001
Author(s)
Tsyh Tyan Yeh, Pedro I. Espina
The presence of non-ideal flow profiles is known to cause significant metering inaccuracies in conventional pipelines. The characteristics of secondary flows are also important for mixer design where flow non-ideality is highly desired. Advances in

Flow Measurement Proficiency Testing

April 1, 2001
Author(s)
G E. Mattingly
To eliminate measurement-base trade barriers to international commerce, Key Comparisons (KCS) are now being planned in the newly formed Working Group for Fluid Flow (WGFF) in the CIPM to quantify the equivalency of the flow standards maintained in the

Laser-Excited Hot-Electron Induced Desorption

March 1, 2001
Author(s)
John William Gadzuk
The history and technical highlights leading up to and following the publication of a classic NIST publication on the theory and experiments involving optical-laser induced desorption of adsorbed NO from metal surfaces is presented.
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