IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This white ceramic rule is stored in ...
Abstract: Empirical formulas are proposed for the superdirectivities of broadside linear and square arrays. The formulas are derived based on a large amount of numerical results of optimum directivity ...
The central Mexican city of Xochicalco was established around a.d. 670 atop a 400-foot-tall hill. At the city’s highest level, which was only accessible through three defended porticoes, stands its ...
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