The necessary conditions for the occurrence of current oscillation, observed in the current-saturation regime regarding the current-voltage characteristics of semiconductors with a dumbbell-shaped structure, have been investigated by varying the carrier densities through illumination and heat. It is necessary to establish an oscillation of the space-charge layer in the wide region at the anode side at the devices. It is also necessary that the electric field at the boundary between the wide region on the anode side and the narrow region exceeds a critical value, above which the velocity of electrons or holes deviates from Ohm's law and becomes saturated.
oxide smoke. Although the latter did not possess geometrical regularity, as did the systems devised by Mr. Melmore, the general similarity of cham structure was remarkable.(1) LOWE and LUCAS.(2) MELMORE.Aggregation of the individual particles composing an aerosol is a phenomenon of primary importance in the aging of the aerosol. The influence of electrification and foreign vapours on the aggregation process has been investigated Results indicate that electrification amounting to a few electron charges per particle has little effect on the rate of aggregation, but has a decided influence on the shapes of the aggregates. In the case of aerosols whose particles have a significant vapour pressure, certain substances which lower this vapour pressure have been found to increase the rate of aggregation, presumably by reducing the vapour cushion surroundmg the pariicles. When the particles are readily soluble in a substance whose vapour is present, the rate of aggregation also appears to be increased because of reduction of the vapour layer about the particles.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.