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For the first time it was discovered that ultraviolet radiation with a wavelength of 200 to 400 nm (maximum 365 nm) radiated from a distance of 40 cm (intensity: 3500 mW/cm²) to PMMA altered its surface wettability as well as a roughness at the nanoscale that was observed with an atomic force microscope (AFM). The roughness rises and falls again in a short time ( 1-2days ) after 75 min and 180 min irradiation time. However , during the next 10 days roughness became stabilized and there was no influence of UV if PMMA was stored in air or in a Petri dish out of glass.
Diese Arbeit beschäftigt sich mit dem Ising-Polynom, einem Graphenpolynom, das von einem physikalischen Modell abgeleitet ist. Es werden verschiedene Darstellungen des Polynoms, seine Beziehungen zu anderen Graphenpolynomen und in ihm enthaltene Grapheninvarianten vorgestellt. Weiter werden, insbesondere für spezielle Graphenklassen, Berechnungsmöglichkeiten beschrieben und der Rechenaufwand betrachtet.