Sessions cover b3.pdf

SPARC 2004 The

Doped Vanadium Oxides Prepared by Liquid Injection MOCVD

Atmospheric pressure liquid injection MOCVD was used for the deposition of
tungsten doped vanadium (IV) oxide coatings. The deposition was carried out
on commercial SiO2-precoated glass using 0.1 M solution of vanadyl
acetylacetonate (VO(acac)2) in methanol (CH3OH) at 0.02 L min-1 and 0.04 L
min-1 oxygen flow rates at 450 oC and 0.8, 1 and 2 at % W using
W(OC2H5)5. The crystallinity, uniformity, oxidation phase, optical properties,
composition and morphology of the films were evaluated by X-ray diffraction,
IR reflectance-transmittance, Raman spectroscopy, Rutherford backscattering
spectroscopy and scanning electron microscopy respectively. The relationship
between dopant concentration and transition temperature (Tc) in the most
applicable range for solar window coatings was refined by formation of a
single-phase film and precise determination of these parameters. Results
obtained demonstrate a reduction in thermochromic Tc from 60 °C in VO2 to
35 °C in V0.98W0.02O2.
Research Institute
The Growth of Thermochromic Vanadium Dioxide Films by Chemical Vapour Deposition School of Computing, Science & Engineering
Validation of LS-DYNA for Blood Vessel Applications: Initial Results

The high mortality rates associated with vascular diseases, complexity of the
system and the inability of medical equipment to provide necessary in vivo
data make numerical modelling of vascular problems an important factor in
modern medicine. This paper examines the capabilities offered by the explicit
dynamics FSI algorithms in LS-DYNA for solving problems in vascular
biomechanics. The onset of a physiological pulse was simulated at the
entrance of a straight segment of artery and the resulting dynamic response in
the form of a propagating wave through the vessel wall was analysed. Initial
results indicate that despite problems posed by hourglassing in the model,
LS-DYNA has the potential to offer reliable results for values of Young's
modulus in the physiological range. Future work is to concentrate on
expanding the range of Young's moduli the model is valid for as well as for
designing a large scale model of the physics of a blood vessel.
Research Institute
Blood Vessel Fluid Structure Interaction School of Computing, Science & Engineering
Spontaneous Fractal Spatial Pattern Formation

Complexity focuses on commonality across subject areas and forms a natural
platform for multidisciplinary activities. Typical generic signatures of
complexity include: (i) spontaneous occurrence of simple pattern (e.g. stripes,
hexagons), emerging as a dominant non-linear mode, and (ii) formation of
highly complex pattern in the form of a fractal (with structure spanning
decades of scale). However, to our knowledge, the firm connection between
these two signatures has not previously been established. This is perhaps not
surprising since system non-linearity tends to impose a specific scale, while
fractals are defined by their scale-less character. Here we report a generic
mechanism for spontaneous fractal spatial pattern formation; this mechanism
has independence with respect to both the particular form of non-linearity and
the particular context of the non-linear system.
Research Institute
Generation and application of fractal laser light School of Computing, Science & Engineering
Light Guiding Light Guiding Light: A New Angle

The propagation of spatial optical solitons - that is, non-diffracting beams - in
a dielectric waveguide is routinely described by the Non-Linear Schrödinger
(NLS) equation. This is a universal model for describing soliton phenomena,
and occurs in many diverse branches of physics. However, NLS-based
models suffer from potentially severe physical limitations in some regimes.
For example, they cannot support multiple waves propagating at arbitrarily
large angles with respect to the reference direction, or the interaction of these
waves. Here, we present a brief overview of some aspects of Helmholtz
soliton theory. This non-paraxial framework extends conventional soliton
theory, and offers a full description of non-linear waves over the complete
range of angular regimes. Consideration of angular aspects of the wave
propagation problem gives rise to novel, non-trivial physical effects that have
no counterpart in paraxial theory.
Research Institute
School of Computing, Science & Engineering

Source: http://www.pg.salford.ac.uk/cms/resources/uploads/File/sparc/Session-B3.pdf