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Many philosophers say that the nature of personal identity has to do with narratives: the stories we tell about ourselves. While different narrativists address different questions of personal identity, some propose narrativist accounts of personal identity over time. The paper argues that such accounts have troubling consequences about the beginning and end of our lives, lead to inconsistencies, and involve backwards causation. The problems can be solved, but only by modifying the accounts in ways that deprive them of their appeal.
Derek Parfit claims that we are not human beings. Rather, each of us is the part of a human being that thinks in the strictest sense. This is said to solve a number of difficult metaphysical problems. I argue that the view has metaphysical problems of its own, and is inconsistent with any psychological-continuity account of personal identity over time, including Parfit's own.
This chapter talks about the intimate connections between identity, quantification, and number. The precise relation between the uncountability thesis and the quantification and identity principles is not easy to establish. The falsity of any of the three principles (identity, quantification, and number) would appear to entail the uncountability thesis. Portions of stuff need not contrast in any way with their surroundings, and can have arbitrary boundaries. Peter Simons has proposed an argument suggesting that the truth conditions of certain sentences must appeal to uncountable things. The chapter argues that portions of gunk would be countable, and then goes on to define 'quasinumerical' descriptions. If the definitions of the quasinumerical descriptions make sense, there could be a population of beings who spoke a language identical to ours except that they use quasinumerical terms where we use genuine numerical ones. The chapter ends with an explanation on the number of things.
The electronic structure of the Pu-based superconductor PuCoGa5 and the Pauli paramagnet UCoGa5 is investigated using photoemission spectroscopy. The photoemission data of PuCoGa5 reveal features at the Fermi energy EF and about 1-1.5 eV below EF indicative of itinerant and localized f-electrons, respectively. Angle-resolved spectra of UCoGa5 show two peaks at similar energies that are highly dispersive, providing evidence for itinerant character of the f-electrons in this material. A comparison of the PuCoGa5 and UCoGa5 data to the spectra of α-Pu and δ-Pu serves to place PuCoGa5 within the context of the more general electronic structure problem in elemental Pu.
The first dedicated local electrode atom probes (LEAP [a
trademark of Imago Scientific Instruments Corporation]) have been
built and tested as commercial prototypes. Several key performance
parameters have been markedly improved relative to conventional
three-dimensional atom probe (3DAP) designs. The Imago LEAP can operate
at a sustained data collection rate of 1 million atoms/minute. This
is some 600 times faster than the next fastest atom probe and large
images can be collected in less than 1 h that otherwise would take many
days. The field of view of the Imago LEAP is about 40 times larger than
conventional 3DAPs. This makes it possible to analyze regions that are
about 100 nm diameter by 100 nm deep containing on the order of 50 to
100 million atoms with this instrument. Several example applications
that illustrate the advantages of the LEAP for materials analysis are
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