61,206 research outputs found
Equilibrium clusters in suspensions of colloids interacting via potentials with a local minimum
In simple colloidal suspensions, clusters are various multimers that result
from colloid self-association and exist in equilibrium with monomers.There are
two types of potentials that are known to produce clusters: a) potentials that
result from the competition between short-range attraction and long-range
repulsion and are characterized by a global minimum and a repulsive tail and b)
purely repulsive potentials which have a soft shoulder. Using computer
simulations, we demonstrate in this work that potentials with a local minimum
and a repulsive tail, not belonging to either of the known types, are also
capable of generating clusters. A detailed comparative analysis shows that the
new type of cluster-forming potential serves as a bridge between the other two.
The new clusters are expanded in shape and their assembly is driven by entropy,
like in the purely repulsive systems but only at low density. At high density,
clusters are collapsed and stabilized by energy, in common with the systems
with competing attractive and repulsive interactions.Comment: 12 pages, 7 figure
The Cardy-Verlinde Formula and Charged Topological AdS Black Holes
We consider the brane universe in the bulk background of the charged
topological AdS black holes. The evolution of the brane universe is described
by the Friedmann equations for a flat or an open FRW-universe containing
radiation and stiff matter. We find that the temperature and entropy of the
dual CFT are simply expressed in terms of the Hubble parameter and its time
derivative, and the Friedmann equations coincide with thermodynamic formulas of
the dual CFT at the moment when the brane crosses the black hole horizon. We
obtain the generalized Cardy-Verlinde formula for the CFT with an R-charge, for
any values of the curvature parameter k in the Friedmann equations.Comment: 10 pages, LaTeX, references adde
Primordial perturbation with a modified dispersion relation
In this paper we study the generation of primordial perturbation with a
modified dispersion relation in various cosmological evolutions. We stress that
the formation of the power spectrum is strongly dependent on the background.
Working in a bounce model with a matter-like contracting phase, we obtain a red
tilt spectrum due to the modified dispersion relation.Comment: 6 pages, 2 figures, 1 tabl
Climate Change and Texas Water Planning: an Economic Analysis of Inter-basin Water Transfers
Panel models with random effects are used to estimate how climate influences in-stream surface water supply, municipal water demand, crop yields and irrigation water use. The results are added into TEXRIVERSIM, a state wide economic, hydrological, environmental and inter-basin water transfer (IBTs) investment model, through the objective function and hydrological constraints. A climate change related scenario analysis from the Global Circulation Models (GCMs)--Hadley, Canadian, BCCR and NCAR with SRES scenarios A1B, B1, and A2 indicates that inter-basin water transfers not only greatly relax water scarcity problems for major cities and industrial counties, but also create growth opportunity for Houston. However, while destination basins receive the benefits, source basins will experience dramatic reduction in in-stream flow and water flows to bays and estuaries. Climate change requires accelerated water development with more IBTs proving economically feasible depending on the GCMs and SRES scenarios.Climate Change, Inter-basin Water Transfers, Water Scarcity, Environmental Stream Flows, Environmental Economics and Policy, Q25, Q54, Q58,
Atomistic Simulations of Flash Memory Materials Based on Chalcogenide Glasses
In this chapter, by using ab-initio molecular dynamics, we introduce the
latest simulation results on two materials for flash memory devices: Ge2Sb2Te5
and Ge-Se-Cu-Ag. This chapter is a review of our previous work including some
of our published figures and text in Cai et al. (2010) and Prasai & Drabold
(2011) and also includes several new results.Comment: 24 pages, 20 figures. This is a chapter submitted for the book under
the working title "Flash Memory" (to be published by Intech ISBN
978-953-307-272-2
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