1,797 research outputs found
Oxidation of Columbium-Chromium Alloys at Elevated Temperatures
Screening studies of the oxidation characteristics of binary alloys of columbium (Ref. 1) showed that chromium was an additive element worthy of intensive study. The screening studies showed that chromium additions were especially helpful in decreasing the oxidation rate of columbium at 10000deg C and were somewhat less beneficial at 12000deg C. It is the purpose of this investigation to study the oxidation characteristics of binary columbium-chromium alloys in more detail
Atomic resolution STM imaging of a twisted single-wall carbon nanotube
We present atomically-resolved STM images of single-wall carbon nanotubes
(SWNTs) embedded in a crystalline nanotube rope. Although they may be
interpreted as of a chiral nanotube, the images are more consistently explained
a an achiral armchair tube with a quenched twist distortion. The existence of
quenched twists in SWNTs in ropes might explain the fact that both as-grown
bulk nanotube material and individual ropes have insulator-like conductivity at
low temperature.Comment: preprint, 4 pages, and 4 gif figure
Structure of resonance eigenfunctions for chaotic systems with partial escape
Physical systems are often neither completely closed nor completely open, but instead are best described by dynamical systems with partial escape or absorption. In this paper we introduce classical measures that explain the main properties of resonance eigenfunctions of chaotic quantum systems with partial escape. We construct a family of conditionally invariant measures with varying decay rates by interpolating between the natural measures of the forward and backward dynamics. Numerical simulations in a representative system show that our classical measures correctly describe the main features of the quantum eigenfunctions: their multifractal phase-space distribution, their product structure along stable and unstable directions, and their dependence on the decay rate. The (Jensen-Shannon) distance between classical and quantum measures goes to zero in the semiclassical limit for long- and short-lived eigenfunctions, while it remains finite for intermediate cases
Rogue Waves: From Nonlinear Schrödinger Breather Solutions to Sea-Keeping Test
Under suitable assumptions, the nonlinear dynamics of surface gravity waves can be modeled by the one-dimensional nonlinear Schrödinger equation. Besides traveling wave solutions like solitons, this model admits also breather solutions that are now considered as prototypes of rogue waves in ocean. We propose a novel technique to study the interaction between waves and ships/structures during extreme ocean conditions using such breather solutions. In particular, we discuss a state of the art sea-keeping test in a 90-meter long wave tank by creating a Peregrine breather solution hitting a scaled chemical tanker and we discuss its potential devastating effects on the ship
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Ficino\u27s Musica Humana: Musico-Astrological Improvisation
The improvvisatore tradition in Florence Italy during the second half of the quattrocento featured poet-musicians who sang poetry for music (poesia per musica) accompanied by the lira (da braccio). This thesis researches Florentine literati and threads of humanism in relation to poetry written for music. By doing so, philosophical and literary trends are analyzed in relation to the Florentine improvvisatore style: frottola versification forms and divinus furor.
Marsilio Ficino’s (1433-1499) direction at the Platonic Academy (founded c. 1463) outside Florence in the hills of Carregi influenced some of the greatest artists and musicians of his time. This thesis focuses on lyric improvisation as a means of connecting mind and body with the universe. In doing so, Ficino’s music-spirit-theory and astrological program are looked at in light of the Platonic sources. The instrument of the improvvisatore, the lira, will be analyzed in relation to affect (ethos) and wellness for mind (soul) and bod
Modulational instability, wave breaking and formation of large scale dipoles in the atmosphere
In the present Letter we use the Direct Numerical Simulation (DNS) of the
Navier-Stokes equation for a two-phase flow (water and air) to study the
dynamics of the modulational instability of free surface waves and its
contribution to the interaction between ocean and atmosphere. If the steepness
of the initial wave is large enough, we observe a wave breaking and the
formation of large scale dipole structures in the air. Because of the multiple
steepening and breaking of the waves under unstable wave packets, a train of
dipoles is released and propagate in the atmosphere at a height comparable with
the wave length. The amount of energy dissipated by the breaker in water and
air is considered and, contrary to expectations, we observe that the energy
dissipation in air is larger than the one in the water. Possible consequences
on the wave modelling and on the exchange of aerosols and gases between air and
water are discussed
Electronic Scattering Effects in Europium-Based Iron Pnictides
In a comprehensive study, we investigate the electronic scattering effects in
EuFe(AsP) by using Fourier-transform infrared
spectroscopy. In spite of the fact that Eu local moments order around
\,K, the overall optical response is strikingly similar
to the one of the well-known Ba-122 pnictides. The main difference lies within
the suppression of the lower spin-density-wave gap feature. By analysing our
spectra with a multi-component model, we find that the high-energy feature
around 0.7\,eV -- often associated with Hund's rule coupling -- is highly
sensitive to the spin-density-wave ordering, this further confirms its direct
relationship to the dynamics of itinerant carriers. The same model is also used
to investigate the in-plane anisotropy of magnetically detwinned
EuFeAs in the antiferromagnetically ordered state, yielding a
higher Drude weight and lower scattering rate along the crystallographic
-axis. Finally, we analyse the development of the room temperature spectra
with isovalent phosphor substitution and highlight changes in the scattering
rate of hole-like carriers induced by a Lifshitz transition
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