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"Most societies in today’sworld are multilingual. ‘Language contact’ occurs when speakers of different languages interact and their languages influence each other. This book is an introduction to the subject, covering individual and societal multilingualism, the acquisition of two or more languages from birth, second-language acquisition in adulthood, language change, linguistic typology, language processing, and the structure of the language faculty. It explains the effects of multilingualism on society and language policy, as well as the consequences that long-term bilingualism within communities can have for the structure of languages. Drawing on the author’s own first-hand observations of child and adult bilingualism, the book provides a clear analysis of such phenomena as language convergence, grammatical borrowing, and mixed languages."

"This open access book contains a structured collection of complete solutions of all significant axially symmetric contact problems. It provides solutions for classical profiles such as the sphere, cone or flat cylindrical punch as well as a multitude of other technically relevant shapes, e.g. the truncated cone, the worn sphere, rough profiles, hollow cylinders, etc. Normal, tangential and torsional contacts with and without adhesion are examined. Elastically isotropic, transversally isotropic, viscoelastic and functionally graded media are addressed. The solutions of the contact problems cover the relationships between the macroscopic quantities of force and displacement, the contact configuration as well as the stress and displacement fields at the surface and in some cases within the half-space medium. The solutions are obtained by the simplest available method--usually involving the method of dimensionality reduction or approaches of reduction to the non-adhesive normal contact problem. "