College of Engineering
http://hdl.handle.net/10092/1
2016-06-28T11:17:10ZClinical Glycaemic Performance of the STAR Protocol
http://hdl.handle.net/10092/12403
Clinical Glycaemic Performance of the STAR Protocol
Stewart, K.W.; Tomlinson, H.; Pretty, C.G.; Fisk, L.; Thomas, F.; Shaw, G.M.; Benyo, B.; Illyes, A.; Szabo-Nemedi, N.; Chase, J.G.
2015-01-01T00:00:00ZEffect of Edge Beam Deformations on the Slab Panel Method
http://hdl.handle.net/10092/12400
Effect of Edge Beam Deformations on the Slab Panel Method
Gu, Taidi
Previous accidental fires in multi-storey buildings and large scale fire tests have shown
composite floors with unprotected steel beams had large deformations but collapse did not
occur due to a mechanism known as tensile membrane action. The Slab Panel Method (SPM)
was developed as a simplified performance-based design method including tensile membrane
action for everyday design.
As SPM has some provisions of edge beam deformations in its analysis, this research was
carried out to assess how realistic these provisions are. The study was performed on SPM and
VUCLAN, which is a non-linear finite element program that includes both thermal and structural
analysis. The effect of various edge continuity conditions on the basic slab panel was assessed
by VULCAN models and compared with SPM. 9 m x 9 m slab panel were firstly investigated,
then 9 m x 6 m and 9 m x 12 m slab panels were modelled to investigate the effect of aspect
ratio on SPM’s provisions.
The VULCAN analyses showed that the slab panels perform better with more internal edges and
edge beam deformations are always critical to the fire resistance of the slab panels. The SPM
and VULCAN deflections were in good agreement in the 9 m x 9 m slab panel, but it
underestimates the deflections of 9 m × 6 m slab panel and was slightly conservative on the 9 m
× 12 m slab panel.
It is concluded that slab continuity over the edge beams significantly enhanced the fire
resistance of the slab panel. SPM provided good estimates on the fire resistance of slab panel
when the edge beams are designed to be very strong or well protected, but underestimated the
external edge beam deformations. It is recommended that when using the SPM in design, the
external edge beams need to be designed for higher loadings than just from the yield line
tributary area and that for irregular panels or high variable loading Finite Element Analysis (FEA)
software is recommended to check the results.
2016-01-01T00:00:00ZMathematical modelling of self-propelling, coalescing droplets
http://hdl.handle.net/10092/12381
Mathematical modelling of self-propelling, coalescing droplets
Khodabocus, M. I.
When two Newtonian droplets touch, this can lead to either droplets self-propulsion
or coalescence phenomenon. This subject does not appear to have hitherto formed a
prime subject of attention for combined theoretical and numerical treatment, and is
undertaken in this thesis.
The first part analyses the response of an interface subject to a volatile sol-
vent source driven by an air-blow effect. The volatile solvent effect is taken into
account through the full definition of the surface tension gradient and the air-blow
effect through a vapour pressure gradient model equation. Employing the long-wave
approximation of the coupled Navier-Stokes and advection-difusion equations, the
mathematical description reduces to a degenerate fourth order nonlinear parabolic
h-evolution equation coupled with one Poisson equation and one non-homogeneous
Lagrangian derivative equation. Computing these equations using the COMSOL Mul-
tiphysics software, the results are presented and contrasted with those which would
present themselves had the surface tension gradient been expressed in truncated form
and the vapour pressure gradient disregarded.
The second part treats of the self-propulsion of a miscible bi-droplet system in a
capillary tube. The mathematical framework consists of the two-phase
flow, phase field equation set, an advection-diffusion chemical concentration equation, and clo-
sure relationships relating the surface tension to the chemical concentration. The
numerical experiments are carried out using the COMSOL Multiphysics software.
The dynamical response of the bi-droplet reveals a rectilinear motion of the sys-
tem at early-times and an exponential at late-times. A parametric study shows that
the motion obeys Poiseuille flow at early-times. The results are compared success-
fully with available experimental data, thereby establishing a general mathematical
description of the phenomenon.
The third part proposes a versatile framework to study droplets coalescence phe-
nomenon in an unconfined environment. The framework uses the laminar two-phase flow
moving mesh method coupled with an advection-diffusion equation, and is con-
structed in such a way that upon variations of a single parameter, the computational
domain yields geometries ranging from a mono to a bi-droplet system. Taking advan-
tage of its geometrical properties, a theory is developed which establishes a generic
equation describing the growth of that highly curved meniscus neck in the power-law
regimes. Using the COMSOL Multiphysics software, the model is tested by proving
the leading order laws numerically and illustrating the corresponding coalescence flows.
Finally, the thesis discusses how more complex situations can be derived out of
those four parts for further scientific exploration.
2016-01-01T00:00:00ZA study of line reduction methods for interactive computer mapping
http://hdl.handle.net/10092/12379
A study of line reduction methods for interactive computer mapping
Peter, Smith
With the increasing availability of powerful graphics workstations,
interactive computer mapping systems are becoming more and more
popular.
The art of map making is thousands of years old and much is still relevant,
However, with the new electronic media and interactive usage come new
problems.
One important problem is this context is associated with map
generalization. Generalization involves the removal of irrelevant or
excessive data and bas· the goal of achieving the greatest possible clarity of
meaning, good legibilty and simplicity [ref IMH82].
In the past, map generalization has been manual, relying mainly on the
knowledge, experience, and intuition of the individual cartographer. In the
interactive environment generalization must be automated - features
appearing and disappearing as dictated by scale.
As generalization lacks a clear underpinning theory there is still much work
to be done in this field.
This report is mainly (because of time limitations), but not whoJly, to do
with one aspect of generalization - line reduction. Several line reduction
methods are intoduced, and a study is made of their relative effectiveness.
1987-01-01T00:00:00Z