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Cellulose papers expand and contract when the humidity of the atmosphere with which they are in equilibrium changes. This phenomenon — known as hygroexpansivity — plays a significant role in the manufacture of such electrical components as capacitors, cables and transformers due to the shrinkage and consequent mechanical instability which the units suffer on being dried before impregnation. While...
In keeping with a flexible editorial policy which has permitted the steady improvement of the Digest over the years, changes in the content of this volume have occurred. The “Magnetics Materials” Chapter is no longer part of the Digest. Members of the AIEE sub-committee on Magnetic Materials indicated that they would continue to prepare an annual digest of their specialty but would prefer to publish...
Dielectric spectroscopy has been used to elucidate the essential structure of carnauba, montan and ouricuri waxes. By analysis of the dielectric constant and loss curves as determined over a broad range of temperature and frequency, it has been possible to establish the presence of permanent electric moments in the molecules and to determine that association through hydrogen bonding exists. Polar...
The electrical properties of papers made from woodpulp prepared by different processes are known to differ. These differences have been attributed to differences in the quantities of residual pentosans, cooking salts, lignin and hemi-celluloses, as well as to the degree of attrition to which the fibers have been subjected. The study reported here is concerned with the variations in electrical properties...
The engineering approach to Insulating Liquids continues to dominate the literary efforts of specialists in this field. Mineral oil remains the chief subject of their studies, and the deterioration of this liquid in service continues to be a puzzle whether considered from the viewpoint of oxidation, metal-ion or free radical kinetics.
Students of dielectrics are displaying increasing courage in attacking more and more complex insulating systems. This has resulted in increasing rapport between scientists and engineers; it has, furthermore, led to a broadening of the scientific base to include chemists, ceramists, biologists, mathematicians, and physicists while electrical engineers have been joined by mechanical and metallurgical...
This year witnessed a decline in the number of publications from many investigators from whom we have come to expect one or two papers annually on molecular and ionic interactions in dielectrics. On the other hand, an enormous increase in dielectric studies is appearing in the literature of India, Japan, and the USSR. Hungary and Yugoslavia have also begun to report serious studies. Because the dielectric-solution...
The three types of investigation into molecular and ionic interactions which received most attention in 1957 were as follows: (a) studies on the effect of parameters such as pressure, light, magnetic fields and temperature upon the dielectric properties of materials, (b) the study of dilute solutions for elucidating the structures of extremely complex compounds, (c) applications of the techniques...
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