8,126 research outputs found
MalLo March: A Live Sonified Performance With User Interaction
Presented at the 22nd International Conference on Auditory Display (ICAD-2016)In this extended abstract we present a new performance piece titled MalLo March that uses MalLo, a predictive percussion instrument, to allow for real-time sonification of live performers. The piece consists of two movements where in the first movement audience members will use a web application and headphones to listen to a sonification of MalLo instruments as they are played live on stage. During the second movement each audience member will use an interface in the web app to design their own sonification of the instruments to create a personalized version of the performance. We present an overview of the hardware and interaction design, highlighting various listening modes that provide audience members with different levels of control in designing the sonification of the live performers
Global Structure of Optically Thin, Magnetically Supported, Two-Temperature, Black Hole Accretion Disks
We present global solutions of optically thin, two-temperature black hole
accretion disks incorporating magnetic fields. We assume that the
{\pi}{\phi}-component of the Maxwell stress is proportional to the total
pressure, and prescribe the radial dependence of the magnetic flux advection
rate in order to complete the set of basic equations. We obtained magnetically
supported (low-{\beta}) disk solutions, whose luminosity exceeds the maximum
luminosity for an advection-dominated accretion flow (ADAF), L > 0.4 {\alpha}^2
L_Edd, where L_Edd is the Eddington luminosity. The accretion flow is composed
of the outer ADAF, a luminous hot accretion flow (LHAF) inside the transition
layer from the outer ADAF to the low-{\beta} disk, the low-{\beta} disk, and
the inner ADAF. The low-{\beta} disk region becomes wider as the mass-accretion
rate increases further. In the low-{\beta} disk, the magnetic heating balances
the radiative cooling, and the electron temperature decreases from ~ 10^9.5 K
to ~ 10^8 K as the luminosity increases. These results are consistent with the
anti-correlation between the energy cutoff in X-ray spectra (hence the electron
temperature) and the luminosity when L > 0.1 L_Edd, observed in the bright/hard
state during the bright hard-to-soft transitions of transient outbursts in
galactic black hole candidates.Comment: 27 pages, 15 figures, accepted for Publications of Astronomical
Society of Japa
Study, Sterilization and Storage Compatibility of Growth Media for Extraterrestrial Use Final Report
Sterilization and storage compatibility of growth media for extraterrestrial us
Thermal Equilibria of Optically Thin, Magnetically Supported, Two-Temperature, Black Hole Accretion Disks
We obtained thermal equilibrium solutions for optically thin, two-temperature
black hole accretion disks incorporating magnetic fields. The main objective of
this study is to explain the bright/hard state observed during the bright/slow
transition of galactic black hole candidates. We assume that the energy
transfer from ions to electrons occurs via Coulomb collisions. Bremsstrahlung,
synchrotron, and inverse Compton scattering are considered as the radiative
cooling processes. In order to complete the set of basic equations, we specify
the magnetic flux advection rate. We find magnetically supported (low-beta),
thermally stable solutions. In these solutions, the total amount of the heating
via the dissipation of turbulent magnetic fields goes into electrons and
balances the radiative cooling. The low- solutions extend to high mass
accretion rates and the electron temperature is moderately cool. High
luminosities and moderately high energy cutoffs in the X-ray spectrum observed
in the bright/hard state can be explained by the low-beta solutions.Comment: 24 pages, 10 figures,accepted for publication in Astrophysical
Journa
STM/STS Study on 4a X 4a Electronic Charge Order of Superconducting Bi2Sr2CaCu2O8+d
We performed low-bias STM measurements on underdoped Bi2212 crystals, and
confirmed that a two-dimensional (2D) superstructure with a periodicity of four
lattice constants (4a) is formed within the Cu-O plane at T<Tc. This 4a X 4a
superstructure, oriented along the Cu-O bonding direction, is nondispersive and
more intense in lightly doped samples with a zero temperature pseudogap (ZTPG)
than in samples with a d-wave gap. The nondispersive 4a X 4a superstructure was
clearly observed within the ZTPG or d-wave gap, while it tended to fade out
outside the gaps. The present results provide a useful test for various models
proposed for an electronic order hidden in the underdoped region of high-Tc
cuprates.Comment: 4 pages, submitted to J. Phys. Soc. Jp
Renormalizability of Massive Gravity in Three Dimensions
We discuss renormalizability of a recently established, massive gravity
theory with particular higher derivative terms in three space-time dimensions.
It is shown that this massive gravity is certainly renormalizable as well as
unitary, so it gives us a physically interesting toy model of perturbative
quantum gravity in three dimensions.Comment: 13 pages, no figure
Ni-impurity effects on the superconducting gap of LaSrCuO studied from the magnetic field and temperature dependence of the electronic specific heat
The magnetic field and temperature dependence of the electronic specific heat
have been systematically investigated in (LSCNO) in order to study Ni-impurity
effects on the superconducting (SC) gap. In LSCNO with =0.15 and =0.015,
the value of () at =0 K, , is
enhanced under the magnetic field applied along the -axis. The
increment of , , follows the Volovik relation
=, characteristic of the SC gap with line nodes,
with prefactor similar to that of a pure sample. The vs.
curve under =0 shows a d-wave-like SC anomaly with an abrupt increase at
and -linear dependence at , although the
-value in the vs. curve increases with increasing
Ni concentrations. Interestingly, as the SC part of , , decreases in LSCNO, is
reduced in proportion to the decrease of . These findings can
be explained phenomenologically by a simple model in which Ni impurities bring
about strong pair breaking at the edges of the coherent nodal part of the Fermi
surface but in the vicinity of the nodes of the SC gap. The reduction of the SC
condensation energy in LSCNO, evaluated from at
{0.3em}\raisebox{0.4ex}{} {-0.75em}\raisebox{-.7ex}{} {0.3em}, is also understood by the same model.Comment: 7 pages, 6 figures, accepted in Phys. Rev.
Random lattice superstrings
We propose some new simplifying ingredients for Feynman diagrams that seem
necessary for random lattice formulations of superstrings. In particular, half
the fermionic variables appear only in particle loops (similarly to loop
momenta), reducing the supersymmetry of the constituents of the Type IIB
superstring to N=1, as expected from their interpretation in the 1/N expansion
as super Yang-Mills.Comment: Section 5 which describes contributions of the string measure adde
A Peculiar Flaring Episode of Cygnus X-1
Recent monitoring of Cyg X-1 with {\em RXTE} revealed a period of intense
flaring, which started in October of 2000 and lasted until March of 2001. The
source exhibited some quite unusual behaviors during this period. The soft
X-ray flux of the source went up and down three times on a timescale of about
one month, as discovered by the ASM aboard RXTE, before finally returning to
the normal level (of the hard state). The observed spectral and temporal X-ray
properties of Cyg X-1 are mostly intermediate between the canonical hard and
soft states. This is known previously for strong X-ray flares, however, we show
that the source did enter a period that resembles, in many ways, a sustained
soft state during the last of the three flares. We make detailed comparisons
between this flare and the 1996 state transition, in terms of the observed
X-ray properties, such as flux--hardness correlation, X-ray spectrum, and power
density spectrum. We point out the similarities and differences, and discuss
possible implications of the results on our understanding of the phenomena of
flares and state transitions associated with Cyg X-1.Comment: 4 pages, 3 figures, accepted for publication in ApJ Letter
Probing the Inflow/Out-flow and Accretion Disk of Cyg X-1 in the High State with HETG/Chandra
Cyg X-1 was observed in the high state at the conjunction orbital phase (0)
with HETG/Chandra. Strong and asymmetric absorption lines of highly ionized
species were detected, such as Fe XXV, Fe XXIV, Fe XXIII, Si XIV, S XVI, Ne X,
and etc. In the high state the profile of the absorption lines are composed of
an extended red wing and a less extended blue wing. The red wings of higher
ionized species are more extended than that of lower ionized species. The
detection of these lines provides a way to probe the properties of the flow
around the companion and the black hole in Cyg X-1 during the high state. A
broad emission feature around 6.5 keV was significantly detected from the both
spectra of HETG/Chandra and PCA/RXTE. This feature appears to be symmetric and
can be fitted with a Gaussian function rather than the Laor disk line model of
fluorescent Fe K line from an accretion disk. The implications of
these results on the structure of the accretion flow of Cyg X-1 in the high
state are discussed.Comment: 16 pages, 4 fiugres. accepted for publication in the v597 n2 ApJ
November 10, 2003 issu
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