Virtual manipulatives are employed by both preservice and inservice teachers to enhance the instructional effectiveness of physical manipulatives and related tools by addressing limitations of access, cost, and adaptability. While research into the use of emerging technologies continues, there are several variables to consider when measuring the effects of virtual manipulative use. Research design, sampling characteristics, and the type of manipulative used may influence achievement. Variables that may influence the effectiveness of virtual manipulatives include: previous experience with computers, grade level, mathematical topic, treatment length, student attitudes toward mathematics, and computer-to-student ratio.

Across the period in which this research was conducted, there has been an increasing emphasis in government and university policies on the promotion of technology integration in higher education. This emphasis has also become evident in Commonwealth and State government policies relating to preservice teacher education because of the need to ensure that teachers enter the profession with the types of technological skills and competencies that can enhance teaching and learning. The research reported in this thesis describes the experiences and perceptions of computer-based technologies from the perspective of academic staff and graduates from two preservice teacher education courses in a Queensland university. The research was conducted in two phases using a repeated cross-sectional longitudinal design. In Phase 1 of the research conducted in 1997, and in Phase 2 in 2002, questionnaires were used to gather data. In Phase 1 of the research, participants comprised 43 academic staff members involved in two preservice teacher education courses and 72 first or second year graduate teachers from these courses. Items in the academic staff and graduate teacher questionnaires elicited information on a range of issues related to the technologies including knowledge and confidence levels, acquisition of knowledge, current and future usage in teaching, advantages and disadvantages of teaching with the technologies, the importance of the technologies to higher and preservice education and the adequacy of preservice teacher education to prepare new teachers to use technologies. Graduate teachers were also questioned about barriers to their classroom use of technologies. Further questions for academic staff investigated the existence of factors that facilitate usage of technologies and the degree to which the presence or absence of these factors constituted barriers or incentives to technology use. A number of questions also explored attitudes surrounding the valuing of teaching, research and publishing. Results from the first phase of research revealed that both academic staff and new teachers made little use of technologies in their teaching. The most salient barriers to academic staff technology use included lack of technical advice and support, time, and lack of evidence of improved student learning and interest. There was also a widely held perception among academic staff that teaching was not valued by their university and that, in particular, innovation in teaching deserved greater recognition. For graduate teachers, barriers to technology use included lack of computers and resources, lack of school funding, and lack of knowledge and training. In Phase 2 of the research, participants comprised 40 academic staff members and 123 graduate teachers from the same two preservice teacher education courses. Participants were again questioned about knowledge and confidence levels, acquisition of knowledge, current and future usage in teaching, and the adequacy of preservice teacher education to prepare new teachers to use technologies. In light of new research and building on findings from the first phase of data collection, several new questions were added. These questions related primarily to the nature and availability of training and how preservice teacher preparation in technology use could be improved. Results from the second phase of research indicated that, among academic staff and graduate teachers, there had been considerable increases in knowledge and confidence levels in relation to the technologies, along with increased levels of usage. Both groups were also significantly more likely than their earlier counterparts to report that preservice teachers were adequately or well prepared in the use of technologies. For graduate teachers, lack of equipment and resources were ongoing barriers to technology use. Training in technology use appeared to be less of an issue for graduate teachers than academic staff with most reporting access to, and satisfaction with, inservice training opportunities. Encouraging too, was the finding that these graduate teachers were significantly more likely than their 1997 counterparts to attribute their knowledge of the technologies to preservice teacher education. While positive change in technology use was evident across this period, continued efforts to support and integrate technology in preservice teacher education remains important, as does support for the innovative use of technology to promote learning in schools.

Annotation This diploma thesis in its theoretical part sums up didactic approaches which serve as a starting point for designing teaching methods and suitable presentation of Information and Communication Technology (ICT) to primary school children. The thesis deals with the impact ICT has on the development of pupils´ personalities with regard to innovative educational processes which are now at work in our schools. The thesis wants to propose and prove possible and useful approaches to ICT teaching at primary schools based on research in the current state of ICT teaching and in the computer literacy of pupils and on teachers´ own ``best experience{\crqq}. The hypothesis was that pupils in ICT lessons are able to work in pairs effectively and that the one with better knowledge of computers can help and give advice to the less experienced one in the pair. In the practical part of the thesis computer literacy of pupils in second and third grades of primary schools is checked with help of a questionnaire. On the basis of selected didactic approaches and analysis of the questionnaire answers a dyadic teaching method was designed and proved in practice. The use of dyadic method is one of possible ways to reach optimal results in ICT teaching at primary schools. The thesis proposes a teaching plan for a third grade of primary school. This teaching plan, effectivity of which was checked in practice and the outcome analysed, can serve as an inspiration for beginning teachers and help them to design their teaching plans for ICT lessons or for employing ICT in other subjects.

The principle of controlled auto-ignition (CAI) is to mix fuel and air homogeneously before compressing the mixture to the point of auto-ignition. As ignition occurs simultaneously, CAI engines operate with lean mixtures preventing high cylinder pressures. CAI engines produce small amounts of nitrogen oxides (NOx) due to low combustion temperatures while maintaining high compression ratios and engine efficiencies. Due to simultaneous combustion and lean mixtures, CAI engines are restricted between low and mid load operations. Various strategies have been studied to improve the load limit of CAI engines. The scope of the project is to investigate the consequences of varying valve timing, as a method to control the mixture temperature within the combustion chamber and therefore, controlling the mixture auto-ignition point. This study presents computational fluid dynamics (CFD) modelling results of transient flow, inside a 0.45 litre Lotus single cylinder engine. After a validation process, a chemical kinetics model is combined with the CFD code, in order to study in-cylinder temperatures, the mixture distribution during compression and to predict the auto-ignition timing. The first part of the study focuses on validating the calculated in-cylinder velocities. A mesh sensitivity study is performed as well as a comparison of different turbulence models. A method to reduce computational time of the calculations is presented. The effects of engine speed on charge delay and charge amount inside the cylinder, the development of the in-cylinder flow field and the variation of turbulence parameters during the intake and compression stroke, are studied. The second part of the study focuses on the gasoline mixture and the variation of the valve timing, to retain different ratios of residual gases within the cylinder. After validation of the model, a final set of CFD calculations is performed, to investigate the effects of valve timing on flow and the engine parameters. The results are then compared to a fully homogeneous mixture model to study the benefits of varying valve duration. New key findings and contributions to CAI knowledge were found in this investigation. Reducing the intake and exhaust valve durations created a mixture temperature stratification and a fuel concentration distribution, prior to auto-ignition. It resulted in extending the heat release rate duration, improving combustion. However, shorter valve timing durations also showed an increase in heat transfer, pumping work and friction power, with a decrease of cylinder indicated efficiency. Valve timing, as a method to control auto-ignition, should only be used when the load limit of CAI engines, is to be improved.

3D woven composites, due to the presence of through-thickness fibre bridging, have the potential to improve damage tolerance and at the same time to reduce the manufacturing costs. However, the ability to withstand damage depends on weave architecture as well as the geometry of individual tows. A substantial amount of research has been performed to understand in-plane properties as well as the performance of 3D woven composites exposed to impact loads, but there is limited research on the damage tolerance and notch sensitivity of 3D weaves and no work is reported on the damage tolerance of 3D weaves with a weft binding pattern. In view of the recent interest in 3D woven composites, the influence of weft binder on the tensile, open hole tensile, impact resistance and subsequent residual compressive strength properties and failure mechanisms of 3D woven composites was investigated against equivalent UD cross-ply laminate. Four different 3D woven architectures; layer-to-layer, angle interlocked, twill angle interlock and modified angle interlock structures were produced under identical weaving conditions. All the above mentioned tests were performed in both the warp and weft directions on 3D woven and UD cross-ply laminates. Stress concentration and yarn waviness due to through-thickness reinforcement led to lower mechanical properties compared with the UD cross-ply laminate. However, improved in-plane and damage tolerance properties of 3D woven composites under tensile loads were achieved by modifying the weave architecture. The influence of the weave architecture and binder yarn orientation on the notch insensitivity and damage tolerance of 3D woven composites was less significant for compressive loads. Despite the lower undamaged compression strength of 3D woven structures, their residual compressive strength was found to be superior to their equivalent UD cross-ply laminates. The lower rate of strength reduction in the 3D woven fabrics laminates was attributed to a crack bridging mechanism, effectively inhibiting delamination propagation.

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The purpose of this study was to evaluate Core5, a computer-assisted instruction (CAI) programme, on developing early literacy skills in struggling kindergartners and providing enrichment for high achieving kindergartners. Conducted through the positivist research paradigm, the research design of this study is a quantitative quasi-experimental non-equivalent control group pretest-posttest design using the probes AIMSweb Letter Name Fluency (LNF), AIMSweb Letter Sound Fluency (LSF), MAP K-2 Early Literacy, as well as a questionnaire regarding teacher perceptions of Core5 and its implementation in the classroom. This study used convenience sampling instead of probability sampling since many schools already use Core5. Fifteen schools in the Matanuska Susitna Borough School District was the target population. The sample group comprised of 751 kindergartners, aged five to six-year-olds divided into the treatment group, the partial treatment group, and the control group. Posttest analysis of LNF and LSF data confirmed all three groups made gains from the pretest, but an ANOVA indicated there was a significant difference between the three groups. A Bonferroni post hoc test determined the treatment group and the partial treatment group were significantly different from the control group. The posttest analysis of MAP K-2 Early Literacy data indicated that all three groups made gains from the pretest. An ANOVA suggested there was no significant difference between the three groups. Lastly, the end-of-year Core5 levels were correlated to the benchmark scores on LNF, LSF and MAP K-2 Early Literacy probes using Pearson’s r. The teacher questionnaire indicated that a majority of teachers have a favourable view of Core5, which is vital to the implementation of Core5 because their attitude is also a significant predictor of student use in the classroom. The findings indicate that Core5 is an effective CAI program to use as part of the kindergarten ELA curriculum. The findings also add to the volume of research on Core5, CAI programmes and blended learning. / English Studies / D. Litt. et Phil. (English)

This research effort compared student learning gains and attitudinal changes through the implementation of two varying instructional approaches on the topic of functions in College Algebra. Attitudinal changes were measured based on the Attitude Towards Mathematics Inventory (ATMI). The ATMI also provided four sub-scales scores for self-confidence, value of learning, enjoyment, and motivation. Furthermore, this research explored and compared relationships between students' level of mastery and their actual level of learning. This study implemented a quasi-experimental research design using a sample that consisted of 56 College Algebra students in a public, state college in Florida. The sample was enrolled in one of two College Algebra sections, in which one section followed a self-adaptive instructional approach using ALEKS (Assessment and Learning in Knowledge Space) and the other section followed a traditional approach using MyMathLab. Learning gains in each class were measured as the difference between the pre-test and post-test scores on the topic of functions in College Algebra. Attitude changes in each class were measured as the difference between the holistic scores on the ATMI, as well as each of the four sub-scale scores, which was administered once in the beginning of the semester and again after the unit of functions, approximately eight weeks into the course. Utilizing an independent t-test, results indicated that there was not a significant difference in actual learning gains for the compared instructional approaches. Additionally, independent t-test results indicated that there was not a statistical difference for attitude change holistically and on each of the four sub-scales for the compared instructional approaches. However, correlational analyses revealed a strong relationship between students' level of mastery learning and their actual learning level for each class with the self-adaptive instructional approach having a stronger correlation than the non-adaptive section, as measured by an r-to-z Fisher transformation test. The results of this study indicate that the self-adaptive instructional approach using ALEKS could more accurately report students' true level of learning compared to a non-adaptive instructional approach. Overall, this study found the compared instructional approaches to be equivalent in terms of learning and effect on students' attitude. While not statistically different, the results of this study have implications for math educators, instructional designers, and software developers. For example, a non-adaptive instructional approach can be equivalent to a self-adaptive instructional approach in terms of learning with appropriate planning and design. Future recommendations include further case studies of self-adaptive technology in developmental and college mathematics in other modalities such as hybrid or on-line courses. Also, this study should be replicated on a larger scale with other self-adaptive math software in addition to focusing on other student populations, such as K - 12. There is much potential for intelligent tutoring to supplement different instructional approaches, but should not be viewed as a replacement for teacher-to-student interactions.

This study was designed to examine computer based instruction in the 9-12 public high school. All high schools included in the study were part of the original Digital High School grants, and had a student population of over 1000 students. The purposes of the study were to examine factors affecting technology implementation, to explore how teacher attitudes, expertise, and cultural and pedagogical beliefs affected adoption, to determine how critical staff development and resources were in successful implementation, and to investigate organizational variables that were in place for successful adoption of computer based instruction. The study was conducted using Everett Rogers' five stages of the innovation-decision process. Nine technology coordinators were interviewed for this study. Following the interviews, 13 categories emerged and a grounded theory was formed. The study concluded with five recommendations for practitioners who would like to successfully implement technology on their school sites.

No description available.