19,883 research outputs found
John F. Sonnett Memorial Lecture Series: The Attorney General: The Federal Government\u27s Chief Lawyer and Chief Litigator, or One Among Many?
Speaker introduction to a lecture by U.S. Attorney General Griffin B. Bell (1977-1979) and United States Circuit Judge of the United States Court of Appeals for the Fifth Circuit (1961-1976). A published version of this lecture can be found under Articles.https://ir.lawnet.fordham.edu/events_programs_sonnet_lectures/1015/thumbnail.jp
Holder exponent spectra for human gait
The stride interval time series in normal human gait is not strictly
constant, but fluctuates from step to step in a complex manner. More precisely,
it has been shown that the control process for human gait is a fractal random
phenomenon, that is, one with a long-term memory. Herein we study the Holder
exponent spectra for the slow, normal and fast gaits of 10 young healthy men in
both free and metronomically triggered conditions and establish that the stride
interval time series is more complex than a monofractal phenomenon. A slightly
multifractal and non-stationary time series under the three different gait
conditions emerges.Comment: 23 pages, 12 figures, 9 Table
Development of phase-change coatings for use as variable thermal control surfaces Final report
Phase change coatings for use as variable thermal control surface
Development of phase-change coatings for use as variable thermal control surfaces Final report, 8 Mar. 1967 - 8 Mar. 1968
Development of phase-change coatings for thermal control of spacecraft surface
Direct Observation of the Fourth Star in the Zeta Cancri System
Direct imaging of the zeta Cnc system has resolved the fourth star in the
system, which is in orbit around zeta Cnc C. The presence of the fourth star
has been inferred for many years from irregularities in the motion of star C,
and recently from C's spectroscopic orbit. However, its mass is close to that
of C, making its non-detection puzzling. Observing at wavelengths of 1.2, 1.7,
and 2.2 microns with the adaptive-optics system of the CFHT, we have obtained
images which very clearly reveal star D and show it to have the color of an M2
star. Its brightness is consonant with its being two M stars, which are not
resolved in our observations but are likely to be in a short-period orbit,
thereby accounting for the large mass and the difficulty of detection at
optical wavelengths, where the magnitude difference is much larger. The
positions and colors of all four stars in the system are reported and are
consistent with the most recent astrometric observations.Comment: 7 pages including 3 tables, 1 figure; To appear in PAS
Emergence of topological electronic phases in elemental lithium under pressure
Lithium, a prototypical simple metal under ambient conditions, has a
surprisingly rich phase diagram under pressure, taking up several structures
with reduced symmetry, low coordination numbers, and even semiconducting
character with increasing density. Using first-principles calculations, we
demonstrate that some predicted high-pressure phases of elemental Li also host
topological electronic structures. Beginning at 80 GPa and coincident with a
transition to the Pbca phase, we find Li to be a Dirac nodal line semimetal. We
further calculate that Li retains linearly-dispersive energy bands in
subsequent predicted higher pressure phases, and that it exhibits a Lifshitz
transition between two Cmca phases at 220 GPa. The Fd-3m phase at 500 GPa forms
buckled honeycomb layers that give rise to a Dirac crossing 1 eV below the
Fermi energy. The well-isolated topological nodes near the Fermi level in these
phases result from increasing p-orbital character with density at the Fermi
level, itself a consequence of rising 1s core wavefunction overlap, and a
preference for nonsymmorphic symmetries in the crystal structures favored at
these pressures. Our results provide evidence that under pressure, bulk 3D
materials with light elements, or even pure elemental systems, can undergo
topological phase transitions hosting nontrivial topological properties near
the Fermi level with measurable consequences; and that, through pressure, we
can access these novel phases in elemental lithium.Comment: 5 pages, 5 figures, accepted for publicatio
Cecilia Betham (1843-1913): Ireland's first female international sports star
Asked to name a female Irish international sports star, individuals such as the athletics all-rounder Mary Peters, the athlete Sonia O’Sullivan, the swimmer Michelle Smith de Bruin or the boxer Katie Taylor would spring to mind. Few would have heard of Cecilia Betham
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