Faculty of Natural Science
http://hdl.handle.net/11394/8
2021-07-25T21:25:32ZThe impact of using technology through cooperative learning on learners’ performance on grade 11 circle geometry
http://hdl.handle.net/11394/8301
The impact of using technology through cooperative learning on learners’ performance on grade 11 circle geometry
Euclidean geometry was recently re-introduced as a compulsory topic in the Mathematics
Curriculum for learners in the Further Education and Training (FET) band in 2012. The
diagnostic analysis reports on the National Senior Certificate (NSC) Mathematics Paper 2
examinations since 2014 has repeatedly expressed concern of the poor performance of leaners
in proof and reasoning items linked to circle geometry. Various efforts have been made to
examine the composition of the curriculum to find ways of motivating learners in the study of
circle geometry and enhancing their performance but not much has been realized. The use of
technology or cooperative learning approaches for the teaching of geometry is beneficial for
pedagogical purposes, particularly for improving learners’ performance in geometry. Hence,
this study investigated the impact of using technology through cooperative learning on
learners’ performance on grade circle 11 geometry. It was thus an attempt to focus on blending
these two teaching methods with an emphasis on the use of technology. The research took place
at a Khayelitsha school and the scope of technology was limited to using a mathematical
computer programme called Heymath.
This research was grounded on the cognitive level framework that is used by the Department
of Basic Education (DBE) in the setting of National Senior examination mathematics papers,
as well as the set of social constructivist views of mathematics teaching and learning. In the
case of the latter, both social constructivism and cognitive constructivism views were
considered and applied for the purposes of this study. Using a positivist paradigm, this
convergent parallel mixed methods study employed a quasi-empirical design, where the control
group consisted of a group 26 grade 11 learners who were comparable to the group of 27 grade
learners that made up the experimental group.
>Magister Scientiae - MSc
2019-11-01T00:00:00ZThe use of well log data in the creation of 3D geological maps
http://hdl.handle.net/11394/8294
The use of well log data in the creation of 3D geological maps
Ile, Charlene Omeniem Keletso
Three-dimensional (3D) graphic representations of geographic environments have become
commonplace in a range of elds. These representations are often an attempt to
represent both geographic forms, as well as the relationships that exist between them.
In contrast to other elds, the use of 3D geological models in the visualisation of the
subsurface environment is relatively new. Additionally, these 3D geological models are
traditionally created through the painstaking process of manual development methods.
As such, the models developed are unable to fully utilise the wealth of geological data
that is collected during subsurface exploration.
Therefore, the objective of this research was to create a 3D geological prototype that allowed
for the visualisation of underground resource reservoirs in a faster, easier and more
aesthetically appealing manner. To achieve the objectives of this research, the problem
was tackled holistically by considering both the theoretical and practical components of
the research. Some theoretical components that were considered are: well log wireline
log data composition, the information that can be extracted from each well log component,
geological data interpolation as well as geological visualisation. Utilisation of
the theoretical component of this research facilitated the development of a programme
that modelled and visualised sub-surface environments. The programme applied the information
from numerous well log datasets and interpolated the various geological layers
that could be found within a region.
>Magister Scientiae - MSc
2021-01-01T00:00:00ZModel theory of algebraically closed fields and the Ax-Grothendieck Theorem
http://hdl.handle.net/11394/8275
Model theory of algebraically closed fields and the Ax-Grothendieck Theorem
Elmwafy, Ahmed Osama Mohamed Sayed Sayed
We introduce the concept of an algebraically closed field with emphasis of the basic model-theoretic
results concerning the theory of algebraically closed fields. One of these nice results about algebraically
closed fields is the quantifier elimination property. We also show that the theory of algebraically closed
field with a given characteristic is complete and model-complete. Finally, we introduce the beautiful
Ax-Grothendieck theorem and an application to it.
>Magister Scientiae - MSc
2020-01-01T00:00:00ZFabrication of type-I indium-based near-infrared emitting quantum dots for biological imaging applications
http://hdl.handle.net/11394/8271
Fabrication of type-I indium-based near-infrared emitting quantum dots for biological imaging applications
Mushonga, Paul
Semiconductor nanocrystals or quantum dots (QDs) are fluorescent nanometer-sized particles
which have physical dimensions that are smaller than the excitonic Bohr radius, large surface
area-to-volume ratios, broad absorption spectra and very large molar extinction coefficients.
Biomedical applications of QDs are mainly based on II-VI QDs containing cadmium, such as
CdSe/ZnS. These cadmium-based systems are associated with high toxicity due to cadmium. As
a result, potential replacements of cadmium-based QDs in biological applications are needed. In
this study, InP/ZnSe QDs were synthesized for the first time using a one-pot hot injection
method. Furthermore, a growth-doping method was used for silver, cobalt and iron incorporation
into the InP core. Water compatibility was achieved through ligand exchange with 3-
mercaptopropionic acid. In vitro cytotoxicity and imaging/internalization of the as-prepared
MP A-InP/ZnSe and MP A-capped CdTe/ZnS QDs were evaluated. InP/ZnSe QDs were
successfully synthesized with ZnSe shell causing a 1.4 times reduction in trap-related emission.
Doctor Scientiae - DSc
2013-01-01T00:00:00Z