15,908 research outputs found
Hearing Emergence: Towards Sound-Based Self-Organisation
A fascination for models derived from natural
organisation of organisms has a long history of
influence in the arts. This paper discusses emergence as
a complex behaviour and its manifestations in the sonic
domain. We address issues inherent in the use of
visual/spatial metaphors for sonic representation and
propose an approach based on sound interaction within
biological complex systems
Natural Selection: A Stethoscopic Amphibious Installation.
This paper discusses emergence as a complex behaviour in the sound domain and presents a design strategy that was used in the creation of the sound installation Natural Selection to encourage the perception of sonic emergence. The interactions in Natural Selection are based on an algorithm derived from an innately sonic emergent ecological system found in nature, that of mating choices by female frogs within a calling male frog chorus. This paper outlines the design and implementation of the installation and describes the research behind its design, most notably the notion of embodiment within a sonic environment and its importance to the perception of sonic emergence
Alien Registration- Davis, Thomas P. (Presque Isle, Aroostook County)
https://digitalmaine.com/alien_docs/33496/thumbnail.jp
The MASSIVE Survey - III. Molecular gas and a broken Tully-Fisher relation in the most massive early-type galaxies
In this work we present CO(1-0) and CO(2-1) observations of a pilot sample of
15 early-type galaxies (ETGs) drawn from the MASSIVE galaxy survey, a
volume-limited integral-field spectroscopic study of the most massive ETGs
() within 108 Mpc. These objects were selected because
they showed signs of an interstellar medium and/or star formation. A large
amount of gas (210 M) is present in 10 out of 15
objects, and these galaxies have gas fractions higher than expected based on
extrapolation from lower mass samples. We tentatively interpret this as
evidence that stellar mass loss and hot halo cooling may be starting to play a
role in fuelling the most massive galaxies. These MASSIVE ETGs seem to have
lower star-formation efficiencies (SFE=SFR/M) than spiral galaxies,
but the SFEs derived are consistent with being drawn from the same distribution
found in other lower mass ETG samples. This suggests that the SFE is not simply
a function of stellar mass, but that local, internal processes are more
important for regulating star formation. Finally we used the CO line profiles
to investigate the high-mass end of the Tully-Fisher relation (TFR). We find
that there is a break in the slope of the TFR for ETGs at high masses
(consistent with previous studies). The strength of this break correlates with
the stellar velocity dispersion of the host galaxies, suggesting it is caused
by additional baryonic mass being present in the centre of massive ETGs. We
speculate on the root cause of this change and its implications for galaxy
formation theories.Comment: 13 pages, 7 figures, accepted by MNRA
Roles of leaf in regulation of root and shoot growth from single node softwood cuttings of grape ( Vitis vinifera )
The role of leaf in regulation of root and shoot growths in single node softwood cuttings of grape ( Vitis vinifera ) was characterised. Leafy cuttings showed early rooting, vigorous root growth and subsequent shoot development. Defoliation at planting induced early sprouting, but adversely affected rooting and decreased the survival of cuttings irrespective of pre-planting treatment with 100 ΜM indole 3-acetic acid (IAA). Treatment with IAA did not affect the percent rooting of leafy cuttings but increased root and shoot growth. Leaf weight (wt) and leaf area of the cuttings showed a highly significant correlation to root wt of the new plant at 4 wk after planting, while cutting stem + petiole wt was either not or less significantly correlated to root and shoot weights of the subsequent plant. The greater the area or wt of leaf, the better the root and shoot growths, implying that leaf contributed to adventitious root growth. However, retaining the leaf for just 2 days was enough to stimulate rooting in more than 80% of the cuttings, suggesting that leaf tissue could also induce root formation. Root growth increased with the period of leaf retention but leaf removal before 3 wk triggered sprouting leading to high mortality in rooted cuttings. Bringing the leaf closer to the rooting zone by preparing leaf at base (LAB) cuttings delayed rooting and sprouting compared with the standard leaf at top (LAT) cuttings. An inhibitory effect on rooting and sprouting by the exposed upper internode region in LAB cuttings is suggested.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/65538/1/j.1744-7348.2004.tb00313.x.pd
Stability of Impurities with Coulomb Potential in Graphene with Homogeneous Magnetic Field
Given a 2-dimensional no-pair Weyl operator with a point nucleus of charge Z,
we show that a homogeneous magnetic field does not lower the critical charge
beyond which it collapses.Comment: J. Math. Phys. (in press
Cofinement, entropy, and single-particle dynamics of equilibrium hard-sphere mixtures
We use discontinuous molecular dynamics and grand-canonical transition-matrix
Monte Carlo simulations to explore how confinement between parallel hard walls
modifies the relationships between packing fraction, self-diffusivity, partial
molar excess entropy, and total excess entropy for binary hard-sphere mixtures.
To accomplish this, we introduce an efficient algorithm to calculate partial
molar excess entropies from the transition-matrix Monte Carlo simulation data.
We find that the species-dependent self-diffusivities of confined fluids are
very similar to those of the bulk mixture if compared at the same,
appropriately defined, packing fraction up to intermediate values, but then
deviate negatively from the bulk behavior at higher packing fractions. On the
other hand, the relationships between self-diffusivity and partial molar excess
entropy (or total excess entropy) observed in the bulk fluid are preserved
under confinement even at relatively high packing fractions and for different
mixture compositions. This suggests that the partial molar excess entropy,
calculable from classical density functional theories of inhomogeneous fluids,
can be used to predict some of the nontrivial dynamical behaviors of fluid
mixtures in confined environments.Comment: submitted to JC
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