A number of labeling procedures for determining shortest paths in a network employ a sequence list in order to carry out the required steps systematically. This paper studies certain formal properties of such sequence lists. It is shown that the...
In previous studies nano sized hydroxyapatite (HA) particles were prepared by sol-gel or precipitation methods, in which the products were washed by aqueous or nonaqueous liquids to remove impurities or undesired components. The washing is know to...
In T0-spaces metrizability can be characterized in terms of mutual convergence of 'neighboring sequences.' In this paper Nagata spaces are characterized in terms of a convergence property of neighboring sequences and more generally it is shown that...
This proportional divider was used by Ferdinand R. Hassler to survey the U.S. Atlantic Coast in the early nineteenth century. Hassler, a Swiss immigrant, was appointed as the first Superintendent of the Survey of the Coast by President Madison in...
This image is part of the Atomic Clock collection. The Atomic Clock collection is comprised of images documenting the development of the atomic clocks that were part of the National Bureau of Standards (NBS) Atomic Time System. The NBS atomic clock...