74 research outputs found
Modelling approaches to the dewetting of evaporating thin films of nanoparticle suspensions
We review recent experiments on dewetting thin films of evaporating colloidal nanoparticle
suspensions (nanofluids) and discuss several theoretical approaches to describe the ongoing
processes including coupled transport and phase changes. These approaches range from
microscopic discrete stochastic theories to mesoscopic continuous deterministic descriptions. In
particular, we describe (i) a microscopic kinetic Monte Carlo model, (ii) a dynamical density
functional theory and (iii) a hydrodynamic thin film model.
Models (i) and (ii) are employed to discuss the formation of polygonal networks, spinodal
and branched structures resulting from the dewetting of an ultrathin ‘postcursor film’ that
remains behind a mesoscopic dewetting front. We highlight, in particular, the presence of a
transverse instability in the evaporative dewetting front, which results in highly branched
fingering structures. The subtle interplay of decomposition in the film and contact line motion is
discussed.
Finally, we discuss a simple thin film model (iii) of the hydrodynamics on the mesoscale.
We employ coupled evolution equations for the film thickness profile and mean particle
concentration. The model is used to discuss the self-pinning and depinning of a contact line
related to the ‘coffee-stain’ effect.
In the course of the review we discuss the advantages and limitations of the different
theories, as well as possible future developments and extensions
Total-energy-based prediction of a quasicrystal structure
Quasicrystals are metal alloys whose noncrystallographic symmetry and lack of
structural periodicity challenge methods of experimental structure
determination. Here we employ quantum-based total-energy calculations to
predict the structure of a decagonal quasicrystal from first principles
considerations. We employ Monte Carlo simulations, taking as input the
knowledge that a decagonal phase occurs in Al-Ni-Co near a given composition,
and using a few features of the experimental Patterson function. The resulting
structure obeys a nearly deterministic decoration of tiles on a hierarchy of
length scales related by powers of , the golden mean.Comment: 9 pages, 3 figure
Photoproduction of mesons associated with a leading neutron
The photoproduction of mesons associated with a leading
neutron has been observed with the ZEUS detector in collisions at HERA
using an integrated luminosity of 80 pb. The neutron carries a large
fraction, {}, of the incoming proton beam energy and is detected at
very small production angles, { mrad}, an indication of
peripheral scattering. The meson is centrally produced with
pseudorapidity {
GeV}, which is large compared to the average transverse momentum of the neutron
of 0.22 GeV. The ratio of neutron-tagged to inclusive production is
in the photon-proton
center-of-mass energy range { GeV}. The data suggest that the
presence of a hard scale enhances the fraction of events with a leading neutron
in the final state.Comment: 28 pages, 4 figures, 2 table
Fashion retailing – past, present and future
This issue of Textile Progress reviews the way that fashion retailing has developed as a result of the application of the World Wide Web and information and communications technology (ICT) by fashion-retail companies. The review therefore first considers how fashion retailing has evolved, analysing retail formats, global strategies, emerging and developing economies, and the factors that are threatening and driving growth in the fashion-retail market. The second part of the review considers the emergence of omni-channel retailing, analysing how retail has progressed and developed since the adoption of the Internet and how ICT initiatives such as mobile commerce (m-commerce), digital visualisation online, and in-store and self-service technologies have been proven to support the progression and expansion of fashion retailing. The paper concludes with recommendations on future research opportunities for gaining a better understanding of the impacts of ICT and omni-channel retailing, through which it may be possible to increase and develop knowledge and understanding of the way the sector is developing and provide fresh impetus to an already-innovative and competitive industr
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Wind Energy-Related Atmospheric Boundary Layer Large-Eddy Simulation Using OpenFOAM: Preprint
This paper develops and evaluates the performance of a large-eddy simulation (LES) solver in computing the atmospheric boundary layer (ABL) over flat terrain under a variety of stability conditions, ranging from shear driven (neutral stratification) to moderately convective (unstable stratification)
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372. Practice-related improvement in attentional functions with novel antipsychotic treatment
Resonant processes and Coulomb interactions in (C59 N)2
10.1063/1.2730787Journal of Chemical Physics12618-JCPS
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