In recent years, the spectrum of stress phenomena, ranging from the tragic to the mundane, has received a great deal of attention in the research literature. Research has found that exposure to a broad range of stress phenomena increases the risk for subsequent psychopathology (Kanner, Coyne, Schaefer, & Lazarus, 1981; Lewinsohn, Mermelstein, Alexander & MacPhillamy, 1985). The assumption that stress phenomena vary along a continuum from mild to severe underlies much of this research (Dohrenwend & Dohrenwend, 1978). Trauma has been understood to constitute the class labelled severe, life event stress (LES) the moderate, and daily hassles (DH) the mild. In empirical studies, these classes have thus been assumed to vary in terms of degree (i.e., quantity) rather than in terms of qualitative differences.
This research project is concerned with liquid-liquid extraction. Specifically, it is a study of the mechanisms of solute transfer in spray towers. A theory is proposed which postulates the existence of three separate stages of solute transfer. These stages of extraction and the operating variables which seem to affect them are discussed.
The Hall Effect in bismuth for a magnetic field strength of from 0.07 to 1.00 gauss was accurately determined by improved methods. Production of the bismuth films. Various methods for obtaining excessively thin, homogeneous bismuth films were tried and compared, such as casting, electroplating, evaporating, sputtering, and metallic spraying, of which the last three methods were particularly successful. Measurement of very low voltages. By refinements made in the potentiometer and measuring circuits readings to one-tenth microvolt were accurate and reproducible. Magnitude of the Hall Effect at low fields. A curve is plotted showing the rapid decrease in the value of -R between 0.07 and 0.30 gauss, and comparison is made with the higher values of field strength. It is noted that by putting the Hall potential of one film in series with one or more other films we obtain comparatively high values of the Hall e. m. f. which may be applied to great advantage as an alternating current rectifier in radio and similar applications.