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" All content is available even if you're not a member and they tend to attract engaged and informed ( read bookish , writerly and educated ) 30-60 year-olds . Many of these strategies were incorporated into an integrated pest management ( IPM ) program for northeastern potato growers and encapsulated in a knowledge-based expert system ( PotatoES ) . The Costumes and set are designed to intensify the Irish peasant lifestyle as it is invaded and overun by the British . In the era we are considering , the 1820s and 1830s , most entertainments were , and had been for centuries , itinerant , and concentrated together in any given place at fair or festival times . " The most powerful method for studying these interfaces has been scanning transmission electron microscopy , but it requires that samples be sectioned and thinned , so it ca n't be considered nondestructive , " says Fadley . So , although the size of the overall force that the building must withstand is determined by the F = MA equation , the way in which this is distributed and concentrated is determined by the configuration .