## Search

Now showing items 1-10 of 45

#### Spatial modelling of fire dynamics in Savanna ecosystems.

(1999)

Fire is used in the management of ecosystems worldwide because it is a relatively inexpensive means of manipulating thousands of hectares of vegetation. Deciding how, where and when to apply fire depends primarily on the ...

#### Artificial neural networks for image recognition : a study of feature extraction methods and an implementation for handwritten character recognition.

(1996)

The use of computers for digital image recognition has become quite widespread.
Applications include face recognition, handwriting interpretation and fmgerprint analysis.
A feature vector whose dimension is much lower ...

#### On the theory and examples of group extensions.

(1999)

The work described in this dissertation was largely motivated by the aim of producing a survey on the theory of group extensions. From the broad scope of the theory of group extensions we single out two aspects to discuss, ...

#### Partial exchangeability and related topics.

(1991)

Partial exchangeability is the fundamental building block in the subjective
approach to the probability of multi-type sequences which replaces the independence
concept of the objective theory.
The aim of this thesis is ...

#### Developing an integrated decision support system for an oil refinery.

(1998)

This thesis considers the problem of residue upgrading operations in an oil
refinery. Visbreaking is a residue-upgrading process that improves profitability
of a refinery. The economics of converting the heavy residue ...

#### Application of genetic algorithms to the travelling salesperson problem.

(1996)

Genetic Algorithms (GAs) can be easily applied to many different problems since
they make few assumptions about the application domain and perform relatively well.
They can also be modified with some success for handling ...

#### On Stephani universes.

(1992)

In this dissertation we study conformal symmetries in the Stephani universe which is
a generalisation of the Robertson-Walker models. The kinematics and dynamics of
the Stephani universe are discussed. The conformal ...

#### The investigation into an algorithm based on wavelet basis functions for the spatial and frequency decomposition of arbitrary signals.

(1994)

The research was directed toward the viability of an O(n) algorithm which could decompose
an arbitrary signal (sound, vibration etc.) into its time-frequency space. The well known
Fourier Transform uses sine and cosine ...

#### Relativistic spherical stars.

(1993)

In this thesis we study spherically symmetric spacetimes which are static with a
perfect fluid source. The Einstein field equations, in a number of equivalent forms,
are derived in detail. The physical properties of a ...

#### 2-generations pf the sporadic simple groups.

(1997)

A group G is said to be 2-generated if G = (x, y), for some non-trivial elements x, y E G. In this thesis we investigate three special types of 2-generations of the sporadic simple groups. A group G is a (l, rn, n )-generated ...