A perfectly matched layer (PML) absorbing material composed of a uniaxial anisotropic material is presented for the truncation of finite-difference time-domain (FDTD) lattices. It is shown that the uniaxial PML material formulation is mathematically equivalent to the perfectly matched layer method published by Berenger (see J. Computat. Phys., Oct. 1994). However, unlike Berenger's technique, the uniaxial PML absorbing medium presented in this paper is based on a Maxwellian formulation. Numerical examples demonstrate that the FDTD implementation of the uniaxial PML medium (...) is stable, equal in effectiveness as compared to Berenger's PML medium, while being more computationally efficient. (shrink)

This reflection attends to Paul White's call in his introduction to this Focus section for a history of science that is informed by the history of emotions. It offers a succinct historical exemplification of the possibilities of studying the history of science in terms of the history of emotions. It draws on Raymond Williams's concept of “structure of feeling” in arguing for the emergence of an adrenaline structure of feeling during the early twentieth century. It provides a mosaic of different (...) views of the immanence of the adrenaline structure of feeling in diverse scientific realms by broaching some of the major themes that appear in the individual essays in this Focus section. -/- . (shrink)

Breaking off the ordinary flow of experience, the passions create a state of exception. In their suddenness and intensity, they map a personal world, fix and qualify our attention, and impel our actions. Outraged anger drives us to write laws that will later be enforced by impersonal justice. Intense grief at the death of someone in our life discloses the contours of that life to us. Wonder spurs scientific inquiry. The strong current of Western thought that idealizes a dispassionate world (...) has ostracized the passions as quaint, even dangerous. Intense states have come to be seen as symptoms of pathology. A fondness for irony along with our civic ideal of tolerance lead us to prefer the diluted emotional life of feelings and moods. Demonstrating enormous intellectual originality and generosity, Philip Fisher meditates on whether this victory is permanent-and how it might diminish us. From Aristotle to Hume to contemporary biology, Fisher finds evidence that the passions have defined a core of human nature no less important than reason or desire. Traversing the Iliad, King Lear, Moby Dick, and other great works, he discerns the properties of the high-spirited states we call the passions. Are vehement states compatible with a culture that values private, selectively shared experiences? How do passions differ from emotions? Does anger have an opposite? Do the passions give scale, shape, and significance to our experience of time? Is a person incapable of anger more dangerous than someone who is irascible? In reintroducing us to our own vehemence, Fisher reminds us that it is only through our strongest passions that we feel the contours of injustice, mortality, loss, and knowledge. It is only through our personal worlds that we can know the world. (shrink)

In this contribution, I examine several key publications on the physiology of emotions from the 1860s to the 1930s. I focus on physiologists who studied the emotions prior to and following William James’s 1884 Mind article, by critically reflecting on the conceptual and practical origins and constituents of the Cannon–Bard thalamic theory of emotions. I offer a historical corrective to several major assumptions in our histories of the scientific study of emotions.