Alternatives to chlorofluorocarbons.

Investigations of the environmental acceptability of fluorocarbon alternatives to chlorofluorocarbons.

Chlorofluorocarbons (CFCs) are currently used in systems for preservation of perishable foods and medical supplies, increasing worker productivity and consumer comfort, conserving energy and increasing product reliability. As use of CFCs is phased out due to concerns of ozone depletion, a variety of new chemicals and technologies will be needed to serve these needs. In choosing alternatives, in...

II. PHYSICAL PROPERTIES Physical Properties of Alternatives to the Fully Halogenated Chlorofluorocarbons

First atmospheric observations of three chlorofluorocarbons

We report the first atmospheric observations of the Chlorofluorocarbons (CFCs) trifluorochloroethene, 3-chloropentafluoropropene and 4,4-dichlorohexafluoro-1butene by means of Gas Chromatography with Electron Capture and Mass Spectrometric detection (GC-ECD-MS) in air samples taken at the Taunus Observatory operated by the University of Frankfurt (Main) and the Jungfraujoch High Altitude Resear...

An adjoint sensitivity study of chlorofluorocarbons in the North Atlantic

[1] Adjoint sensitivities of CFC-11 concentrations and CFC-11/CFC-12 ratio ages in a North Atlantic general circulation model are analyzed. These sensitivities are compared with those of spiciness, T (b/a) S, where a, b are the thermal and haline expansion coefficients, respectively. High-sensitivity fields are candidates for providing the most powerful constraints in the corresponding inverse ...

Alternatives to Hysterectomy GJ.qxp

This Practice Bulletin was developed by the ACOG Committee on Practice Bulletins—Gynecology with the assistance of Elizabeth A. Stewart, MD. The information is designed to aid practitioners in making decisions about appropriate obstetric and gynecologic care. These guidelines should not be construed as dictating an exclusive course of treatment or procedure. Variations in practice may be warran...