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Displaying 851 - 875 of 1916

Conditioning of Flowing Multiphase Samples for Chemical Analysis

February 15, 2007
Author(s)
Thomas J. Bruno
The chemical analysis of process streams is a common task that must be completed thousands of times every day in the chemical industry. In refineries, at gas wells, in chemical processing plants and in fine pharmaceutical facilities, there is a continual

120Hz Pulse Tube Cryocooler for Fast Cooldown to 50K

February 13, 2007
Author(s)
Srinivas Vanapalli, Michael A. Lewis, Zhihua Gan, Ray Radebaugh
A pulse tube cryocooler operating at 120 Hz with 3.5 MPa average pressure achieved a no-load temperature of about 49.9 K and a cooldown time to 80 K of 5.5 minutes. The net refrigeration power at 80 K was 3.35 W with an efficiency of about 22.6% of Carnot

Temperature-Controlled Depth Profiling in Poly (methylmethacrylate) (PMMA) Using Cluster Secondary Ion Mass Spectrometry (SIMS) II. An Investigation of Sputter-Induced Topography, Chemical Damage and Depolymerization Effects

February 1, 2007
Author(s)
Christine M. Mahoney, Albert J. Fahey, John G. Gillen, Chang Xu, James Batteas
Secondary Ion Mass Spectrometry (SIMS) employing an SF polyatomic primary ion source was used to depth profile Poly(methyl methacrylate) (PMMA) at a series of temperatures from -75 C to 125 C where the primary glass transition for PMMA occurs at 105 C. The

Temperature-Controlled Depth Profiling in Poly(methylmethacrylate) (PMMA) Using Cluster Secondary Ion Mass Spectrometry (SIMS): I. Investigation of Depth Profile Characteristics

February 1, 2007
Author(s)
Christine M. Mahoney, Albert J. Fahey, John G. Gillen
Secondary Ion Mass Spectrometry (SIMS) employing an SF5+ polyatomic primary ion source was used to depth profile Poly(methyl methacrylate) (PMMA) at a series of temperatures from -75 oC to 125 oC, where the primary glass transition for PMMA occurs at 105

Widefield Light Microscopy Method for High Resolution and Quantum Dot Spectral Studies

January 1, 2007
Author(s)
Cynthia J. Zeissler, Keana C. Scott, Richard D. Holbrook, Peter E. Barker, Yan Xiao
We are exploring methods to achieve 3D 200 nm resolution multispectral imaging with an ordinary inexpensive widefield microscope using incoherent white light sources and an electronically tunable filter. In this work, the capabilities were applied to

NIST Calibration Services for Water Flowmeters Water Flow Calibration Facility

August 1, 2006
Author(s)
Iosif I. Shinder, Iryna V. Marfenko
This document describes the Water Flow Calibration Facility (WFCF) at the National Institute of Standards and Technology (NIST). This facility has three parallel pipelines with diameters of 100, 200 and 400 mm and three weighing systems with capacities of

3D Molecular Imaging SIMS

July 1, 2006
Author(s)
John G. Gillen, Albert J. Fahey, M Wagner, Christine M. Mahoney
Thin monolayer and bilayer filsm of spin cast poly(methyl methacrylate) (PMMA), poly(2-hydroxyethyl methacrylate) (PHEMA), poly(lactic) acid (PLA) and PLA doped with several pharmaceuticals have been analyzed by dynamic SIMS using SF 5+ polyatomic primary

SIMS Depth Profiling of Polymer Blends With Protein Based Drugs

July 1, 2006
Author(s)
Christine M. Mahoney, J Yu, Albert J. Fahey, J Gardella
The use of SF5+ cluster ions for depth profiling has been successful for polymer-drug mixtures and polymer blends. This study reports results of the surface and in-depth characterization of two component blend films of poly(L-lactic acid) (PLLA) and

Characterization of Inertance Tubes Using Resonance Effects

June 14, 2006
Author(s)
Michael A. Lewis, Peter E. Bradley, Ray Radebaugh, Zhihua Gan
Inertance tubes can be characterized by their inertance, compliance, and resistance. All three of these impedance components are present during normal measurements of inertance tube impedance. As a result, in comparing experimental results with models it
Displaying 851 - 875 of 1916
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