Valency

About: Valency is a research topic. Over the lifetime, 1632 publications have been published within this topic receiving 26141 citations.

Verb Retrieval in Fluent Aphasia in Two Elicitation Contexts

Abstract: This study investigated the presence and nature of verb deficits in 4 individuals with fluent aphasia in both single-word and narrative contexts. All participants showed impaired verb naming. Their verb retrieval showed a syntactic effect, having more difficulty retrieving two-place (transitive) than one-place (intransitive) verbs. In addition, the more arguments associated with a verb, the worse their production of argument structure in narratives, indicating impaired use of verb-related information in narrative context. A verb's semantic complexity had a clear effect on verb retrieval in the narrative task only. Their over-reliance on simple, all-purpose, 'light' verbs in narratives also indicated impaired verb retrieval in their spontaneous speech.

A Study of Electron Effects in Solid Solution Alloys of Titanium

Abstract: Anomalous behavior of the lattice parameters of solid solution alloys of aluminum and gallium in titanium were observed at approximately 3 atomic percent solute. Alloys of silver in titanium did not exhibit similar anomalies. Anomalies also were observed in the resistivity and in the coefficient of magneto-resistance for solutes of Al and Ga. No significant evidence of anomalous behavior of the Hall coefficient or the magnetic susceptibility with solute concentration was found. The effect of solute valency in producing the observed anomalous changes in physical properties is interpreted; using the Bloch-Brillouin approximation, as evidence of interaction between the Fermi surface and the Brillouin Zones. The effects produced by monovalent Ag and trivalent Al and Ga solutes indicate that titanium has an alloying valency between 1 and 3 in these alloys. The Brillouin Zone interpretation indicates that the alloying valency of titanium is about 1.5 electrons per atom. The absence of an effect of solute addition on the susceptibility, the susceptibility-temperature data of Squire and Kaufmann, and the magnitude of the susceptibility indicate that titanium is anti-ferromagnetic. The suggested antiferromagnetism is in agreement with the interpretation of the effects of solute additions on the other observed physical properties. It is, therefore, concluded that titanium has approximately 2 electrons per atom in antiferromagnetic coupling between neighboring atoms, and about 2 electrons per atom in the conduction band. Neutron diffraction experiments to verify the suggested existence of a simple hexagonal antiferromagnetic superlattice in titanium are urged.