Reference Values and Reference Correlations for the Thermal Conductivity and Viscosity of Fluids.

In this paper, reference values and reference correlations for the thermal conductivity and viscosity of pure fluids are reviewed. Reference values and correlations for the thermal conductivity and the viscosity of pure fluids provide thoroughly evaluated data or functional forms and serve to help calibrate instruments, validate or extend models, and underpin some commercial transactions or designs, among other purposes. The criteria employed for the selection of thermal conductivity and viscosity reference values are also discussed; such values, which have the lowest uncertainties currently achievable, are typically adopted and promulgated by international bodies. Similar criteria are employed in the selection of reference correlations, which cover a wide range of conditions, and are often characterized by low uncertainties in their ranges of definition.

Digitalis after two centuries (William Withering).

It is the bicentennial anniversary of the introduction of digitalis into medicine. Digitalis is one of the most important drugs ever discovered, and after two centuries, it is still the most widely used drug in cardiology. However, it was at one time so badly abused that for nearly a century it was almost abandoned. Early in this century, the valuable effects of digitalis were once again recognized and extended. The molecular basis of action has been defined and now methods are available to detect early toxicity. Recent advances in combating toxic effects show considerable promise. Skillful administration of the drug, using purified standard tablets, careful monitoring by clinical electrocargiography, and analytical methods can secure the maximun benefits with the minimum degree of toxicity.