David Ferry

John R. Barker

Carlo Jacoboni

The technological means now exists for approaching the fundamentallimiting scales of solid state electronics in which a single carrier can, in principle, represent a single bit in an information flow. In this light, the prospect of chemically, or biologically, engineered molccular-scale structures which might support information processing functions has enticed workers for many years. The one common factor in all suggested molecular switches, ranging from the experimentally feasible proton-tunneling structure, to natural systems such as the micro-tubule, is that each proposed structure deals with individual information carrying entities. Whereas this future molecular electronics faces enormous technical challenges, the same Iimit is already appearing in existing semiconducting quantum wires and small tunneling structures, both superconducting and normal meta! devices, in which the motion of a single eh arge through the tunneling barrier can produce a sufficient voltage change to cut-off further tunneling current. We may compare the above situation with today's Si microelectronics, where each bit is encoded as a very !arge number, not necessarily fixed, of electrons within acharge pulse. The associated reservoirs and sinks of charge carriers may be profitably tapped and manipulated to proviele macro-currents which can be readily amplified or curtailed. On the other band, modern semiconductor ULSI has progressed by adopting a linear scaling principle to the down-sizing of individual semiconductor devices.

Granular Nanoelectronics

Karla J. Bellinger

Study and reflect upon the scripture readings of each Sunday and solemnity throughout Liturgical Year A. This complete study resource includes thought-provoking commentary, insightful reflections, and lively discussion questions presented by a trusted and qualified pair of expert theologians. Ideal for discussion groups, scripture study groups, small Christian communities, teen or adult religious education classes, homilists, and presiders. This book has been widely and successfully used with catechumens, candidates, and the newly initiated looking for a deeper understanding of their chosen faith.

John R. Barker

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