Things that Believe: Talismans, Amulets, Dolls, and How to Get Rid of Them

This article looks at religious and semi-religious paraphernalia in everyday life from the perspective of disposal. Recent research in religious studies and anthropology has focused on the ways in which beliefs are performed through religious objects. But what happens to the object that is not performed? What notions of materiality do they bring into play? By using the notion of migawari (body substitution) and ethnographic vignettes, I argue that talismans and amulets become “believing substitutes” that allow for an externalization of belief altogether. They become problematic again at the point of disposal. In particular, in the case of dolls, where body substitution acquires a literal sense, questions of the relationship between dolls and their owners, and of their value and inalienability, add to the dolls’ ambiguity. Memorial rites for dolls instill a sense of closure for participants by appealing to orthopraxy rather than by addressing beliefs concerning dolls

Robot Companions: The Animation of Technology and the Technology of Animation in Japan

Contemporary Japan is often described in utopian terms as a place where humans and nonhumans live and work together in harmony. This acceptance of nonhuman others is explained by some anthropologists as stemming from an “animist unconscious” (Allison 2006) that allows people to attribute “life” to robots and other artefacts, a notion that is explicitly linked to the “Shinto universe” of “native animist beliefs” (Robertson 2010). Contrary to the darker tone of robot fantasies in the EuroAmerican tradition, this “techno-animism” turns technological objects into non-alienating allies, or so the narrative goes. This chapter critically examines the ideological underpinnings of these claims. Instead of attributing “modern techno-animism” to a native and naïve ontology, the author argues that all forms of animism are “techno-animism” because they are based on a technology of animation. In turn, this technology of animation is based on what Bird-David (1999) understands as “relatedness”, but which the author hesitates to call a “relational ontology” because what enables animation is often a relation that emerges from an unexpected and surprising encounter. Drawing on the work of Japanese roboticists and anthropologists of technology, this chapter proffers the heuristic device of an “animation continuum” to better apprehend the broad range of relations that result in animation

Ab initio Molecular Dynamics in Adaptive Coordinates

We present a new formulation of ab initio molecular dynamics which exploits the efficiency of plane waves in adaptive curvilinear coordinates, and thus provides an accurate treatment of first-row elements. The method is used to perform a molecular dynamics simulation of the CO_2 molecule, and allows to reproduce detailed features of its vibrational spectrum such as the splitting of the Raman sigma+_g mode caused by Fermi resonance. This new approach opens the way to highly accurate ab initio simulations of organic compounds.Comment: 11 pages, 3 PostScript figure

Mercury in Our Environment

A project was initiated July 1, 1971, involving the Station Biochemistry and Animal Science departments, to study mercury from the standpoint of (1) methods for mercury determination in natural materials, (2) a survey of the occurrence of mercury in nature in South Dakota and (3) the toxicity of different chemical forms of mercury especially with respect to animal reproduction and teratogenic effects

Star-shaped Local Density of States around Vortices in a Type II Superconductor

The electronic structure of vortices in a type II superconductor is analyzed within the quasi-classical Eilenberger framework. The possible origin of a sixfold ``star'' shape of the local density of states, observed by scanning tunneling microscope experiments on NbSe$_2$, is examined in the light of the three effects; the anisotropic pairing, the vortex lattice, and the anisotropic density of states at the Fermi surface. Outstanding features of split parallel rays of this star are well explained in terms of an anisotropic $s$-wave pairing. This reveals a rich internal electronic structure associated with a vortex core.Comment: 4 pages, REVTeX, 3 figures available upon reques

A Self-Consistent Microscopic Theory of Surface Superconductivity

The electronic structure of the superconducting surface sheath in a type-II superconductor in magnetic fields $H_{c2}<H<H_{c3}$ is calculated self-consistently using the Bogoliubov-de Gennes equations. We find that the pair potential $\Delta(x)$ exhibits pronounced Friedel oscillations near the surface, in marked contrast with the results of Ginzburg-Landau theory. The role of magnetic edge states is emphasized. The local density of states near the surface shows a significant depletion near the Fermi energy due to the development of local superconducting order. We suggest that this structure could be unveiled by scanning-tunneling microscopy studies performed near the edge of a superconducting sample.Comment: 12 pages, Revtex 3.0, 3 postscript figures appende

Comparison of Global and Local Adaptive Coordinates for Density Functional Calculations

A globally-adaptive curvilinear coordinate formalism is shown to be easily convertible to a class of curvilinear transformations locally optimized around atom sites by a few parameters. Parameter transferability is established for a demanding test case, and the results of the two methods are shown to be comparable. Computational efficiencies realized in the local method are discussed.Comment: 21 pages, 4 figure

A unified electrostatic and cavitation model for first-principles molecular dynamics in solution

The electrostatic continuum solvent model developed by Fattebert and Gygi is combined with a first-principles formulation of the cavitation energy based on a natural quantum-mechanical definition for the surface of a solute. Despite its simplicity, the cavitation contribution calculated by this approach is found to be in remarkable agreement with that obtained by more complex algorithms relying on a large set of parameters. Our model allows for very efficient Car-Parrinello simulations of finite or extended systems in solution, and demonstrates a level of accuracy as good as that of established quantum-chemistry continuum solvent methods. We apply this approach to the study of tetracyanoethylene dimers in dichloromethane, providing valuable structural and dynamical insights on the dimerization phenomenon

Quasiparticle States at a d-Wave Vortex Core in High-Tc Superconductors: Induction of Local Spin Density Wave Order

The local density of states (LDOS) at one of the vortex lattice cores in a high Tc superconductor is studied by using a self-consistent mean field theory including interactions for both antiferromagnetism (AF) and d-wave superconductivity (DSC). The parameters are chosen in such a way that in an optimally doped sample the AF order is completely suppressed while DSC prevails. In the mixed state, we show that the local AF-like SDW order appears near the vortex core and acts as an effective local magnetic field on the quasiparticles. As a result, the LDOS at the core exhibits a double-peak structure near the Fermi level that is in good agreement with the STM observations on YBCO and BSCCO. The presence of local AF order near the votex core is also consistent with the recent neutron scattering experiment on LSCO.Comment: 4 pages, 2 ps figure