Reasoning, elegant

The most important differences between the enriched and natural fuelled reactors stem from the fact that, with the natural system, one no longer has the freedom to choose the fuel/moderator ratios to give a void coefficient of reactivity which is near to zero. Instead, it is substantially positive. This, as a result, alters the control requirements and it is these aspects which are at present receiving intensive study. The problem is not one of searching for a method of control, but one of comparing various methods to Identify a reasonably elegant and inexpensive solution. 

It will be shown that a more elegant and more easily applicable solution of the problem is given by choosing another reference system. Both the dilute alloy and the unperturbed host can be described with respect to a common reference system, which consists of the unperturbed part of the alloy system and for obvious reasons is called void system. This void system allows for a single-site evaluation of the matrix element describing the wind force in electromigration and the t-matrix element required for the calculation of the residual resistivity due to a saddle-point defect. 

The second half of the eighteenth century is usually served up as the Age of Reason, with a heavy menu of philosophers like Rousseau, Hume, and Adam Smith. McCalman s Cagliostro shows that it was no less the age of magic, mystery, and mayhem. The Last Alchemist is presented with wit and elegance. —Norman Davies, author of Europe A History... 

Back in the not-so-good old days, scientists speculated and experimented about the molecular nature of the genetic material—the stuff of genes— for several decades. Prior to 1944, and actually for some years beyond that, most scientists believed that genes were proteins. This was a reasonable point of view given the many roles that proteins were already known to serve. But it is not so and Oswald Avery (1877-1955) is the person responsible for telling us, elegantly and persuasively, that it is not so. 

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