Goethe's Colors: Revolutionary Optics and the Anthropocene
Abstract:For Johann Wolfgang Goethe (1749-1832), a study of colors expresses the morphological and metamorphic processes of the active natural world, energized by the sunlight, that grow, live, and crystallize into ever new forms. Rather than focusing on static objects, Goethe saw the natural—and social—world as an expression of ongoing processes. Colors are, above all, actively developing components of a world in fux, not fxed entities. Newton, he wrote, was wrong in that he studied light as if it were an isolated feature and not an interactive part of the world. Newton's breakdown of white light into the spectrum of colors is accurate, of course; what Goethe recognized, in contrast, is the more complex and muddied realm of perception and relations between and among things and observers, studied in quantum mechanics and the new materialisms. In other words, these felds and Goethe postulate that our physical world and human existence are part of manifold engagements between energy, matter, living things, and mental perception. We are never truly "outside" of the system that we study, though most of empirical science assumes that we are or could be or at least should strive to be when undertaking objective studies. With this vision, Goethe offers what I call a proto-"ecological theory of colors" at the beginning of the newly defned geological era of the Anthropocene when human activities have left traces on environmental systems across the entire Earth.
Ecocriticism, Goethe’s Optics and Unterhaltungen deutscher Ausgewanderten: Emergent Forms versus Newtonian “Constructions”
Long viewed as an anomalous assemblage of tales formulating either social or aesthetic developments, Goethe’s Unterhaltungen deutscher Ausgewanderten, in fact, presents a sequence of perceptual categories relating to his optics and his exploration of our interface with the physical world around us. From the troublingly inexplicable sounds of the ghost stories through the embrace and renunciation of physical desires to the final, idealized visual spectrum of the Märchen’s colors and lights, the tales’ path explores how physical perception is enmeshed with interpretation. Hence the Unterhaltungen relates to ecocriticism’s interrogation of human- nature environments in that both Goethe and ecocriticism seek to change our perception itself so that we might recognize the “emergent forms” in which we inevitably participate (rather than simply “control” them). Both also seek to comprehend the artificiality of the damaging “constructions” wrought by Newtonian science (according to Goethe) or by the view that the natural world is naught but static material awaiting our “enlivenment.” (HIS)
Surface roughness monitoring by singular spectrum analysis of vibration signals
Abstract This study assessed two methods for enhanced surface roughness (Ra) monitoring based on the application of singular spectrum analysis (SSA) to vibrations signals generated in workpiece-cutting tool interaction in CNC finish turning operations i.e., the individual analysis of principal components (I-SSA), and the grouping analysis of correlated principal components (G-SSA). Singular spectrum analysis is a non-parametric technique of time series analysis that decomposes a signal into a set of independent additive time series referred to as principal components. A number of experiments with different cutting conditions were performed to assess surface roughness monitoring using both of these methods. The results show that singular spectrum analysis of vibration signal processing discriminated the frequency ranges effective for predicting surface roughness. Grouping analysis of correlated principal components (G-SSA) proved to be the most efficient method for monitoring surface roughness, with optimum prediction and reliability results at a lower analytical-computational cost. Finally, the results show that singular spectrum analysis is an ideal method for analyzing vibration signals applied to the on-line monitoring of surface roughness.