In this dissertation, we study properties of quantum interaction phenomena in two-dimensional (2D) and one-dimensional (1D) electronic systems in p-GaAs micro- and nano-scale devices. We present low-temperature magneto-transport data from three forms of low-dimensional systems 1) 2D hole systems: in order to study interaction contributions to the metallic behavior of 2D systems 2) Bilayer hole systems: in order to study the many body, bilayer quantum Hall state at nu = 1 3) 1D hole systems: for the study of the anomalous conductance plateau G = 0.7 ???? 2e2/h The work is divided into five experimental studies aimed at either directly exploring the properties of the above three interaction phenomena or the development of novel device structures that exploit the strong particle-particle interactions found in p-GaAs for the study of many body phenomena. Firstly, we demonstrate a novel semiconductor-insulator-semiconductor field effect transistor (SISFET), designed specifically to induced 2D hole systems at a ????normal???? AlGaAs-on-GaAs heterojunction. The novel SISFETs feature in our studies of the metallic behavior in 2D systems in which we examine temperature corrections to ????xx(T) and ????xy(T) in short- and long-range disorder potentials. Next, we shift focus to bilayer hole systems and the many body quantum Hall states that form a nu = 1 in the presence of strong interlayer interactions. We explore the evolution of this quantum Hall state as the relative densities in the layers is imbalanced while the total density is kept constant. Finally, we demonstrate a novel p-type quantum point contact device that produce the most stable and robust current quantization in a p-type 1D systems to date, allowing us to observed for the first time the 0.7 structure in a p-type device.

Throughout childhood, children experience the social semiotic of music in a variety of ways. As they sing, dance, move, and play, they enjoy making and listening to music. Childhood is also a time of immense change. During their early years, children grow and develop at a faster rate than at any other time in their lives, displaying an intense proliferation of ways of knowing about the world. As part of the industrious activity that accompanies this explosion of knowledge, children sing many songs. It is through sensitive investigation of these songs that we can begin to understand what children know about music, and the place that it is afforded in the social milieux within which they participate. Children???s songs have been the focus of investigation for a number of years, with a range of studies reporting on the manner in which they reflect musical development. Several researchers have reported on children???s songs from a developmental perspective, while others have focussed on the social and functional contexts of the songs. These various approaches have established some basic principles concerning the development of children???s musical skills and knowledge. It is accepted that as children mature, they are likely to exhibit changes in their musical understanding and abilities. However, the diverse range of inquiries that have been undertaken, although rigorous, have resulted in fragmented and irresolute information about the manner in which these changes take place. Research into all areas of children???s development has recently undergone a paradigm shift, with current views focussing on the agency of children and their development within a social context. Such perspectives view the acquisition of knowledge as a dynamic process that occurs as children interact with others, and therefore place great importance on a range of environments in which this knowledge gain takes place. This thesis reports on a 3-year longitudinal study of eight preschool-aged children who were attending a long day care centre in Sydney. Regular video-recordings were made of the children???s spontaneous singing during free play, with each child recorded approximately once per month. Camera tapes were examined and all examples of the participants??? singing were transferred to VHS tapes for transcription and analysis. The resulting 443 songs were transcribed using Western notation, and each play episode and associated song then coded for musical aspects such as song type, melodic range and level of temporal organisation, as well as social aspects such as song function and social roles taken on by the children. The notion of social role was informed by Vygotsky???s Zone of Proximal Development. In addition to base data such as the child???s name and the date of the observation, the resultant dataset was transferred to a qualitative software package (NUD???IST) for subsequent analysis and interpretation. Results of the study indicate that the children used songs for specific purposes, and that patterns of musical development were distinctly different for each child. While interacting with their playmates, the children used both explicit and implicit tools to acquire and transmit musical signs. During this process, the status of knowledgeable other was often conferred on a playmate by a less knowledgeable member of the group, and was not solely dependent on chronological age. The results exhibit some congruence with prior studies, especially those for which the social context of music-making was an important consideration. The findings expand previous developmentally-based investigations by showing that conceptions based on a unidirectional model of musical development, closely linked to chronological age, need to be refined to consider the diversity of social contexts and generative processes within which children???s musical cultures can be defined. The current study supports a modular conception of musical development allied with recent social reconstructions of childhood. Some substantiation of previously reported Western musical universals was found in the children???s production of a specific form of chant, and their ability to operate within meaningful musical units such as phrases. The thesis includes a discussion of practical and theoretical implications that arise from the findings. Several implications for the classroom are offered. Among the most important are that children???s musical constructions should be utilised as important components of planned teaching and learning experiences, because they are capable of producing sophisticated music if afforded the opportunity to do so. Careful observation of existing musical knowledge and its incorporation in teachers??? programming will facilitate an efficient and appropriate mode of teaching and learning, based on the needs and interests of the children. As the children were able to scaffold each other in the process of transmitting and acquiring musical knowledge, it appears advantageous to group them in mixed ages for at least some part of the week. However, without some intervention on the part of the teacher, it seems that they would likely rely on a fairly restricted collection of scaffolding behaviours. Additional research is recommended to determine the value of a number of strategies that can be used to meet the musical needs of preschool-aged children beyond the current research site. Indeed, the outcomes of the study question the importance of striving for a unidirectional model of musical development, immersed in the veil of teleology, and suggest that further research be undertaken in the area of children???s songs, which acknowledges the social agency of children, and their roles in their own musical cultures.

The nature of creative mathematical thinking undertaken by students in classroom settings was studied through analysis of the autonomy and spontaneity associated with these processes. The theoretical lens developed enabled simultaneous analysis of cognitive, social, and affective elements of the creative process, and student responses to successes and failures during their exploratory activity (resilience or optimism). Collective case study was employed, with each case progressively informing the analysis of subsequent cases. The classrooms of teachers who were seen by their school communities to display 'good teaching practice' were selected for study. It was anticipated that such classrooms would provide more opportunity to study creative thinking than classrooms chosen at random. During the research period, each student participated individually in post-lesson interviews that were stimulated by lesson video material. To generate data to study student thinking, and the social and personal influences upon it, students were asked to identify parts of the lesson that were important to them, and discuss what was happening, and what they were thinking and feeling. Through this process, students who explored mathematical complexities to generate new mathematical knowledge were identified. (For complete abstract open document)

The focus of this thesis is to investigate the use of art therapy in the treatment of an individual diagnosed with schizophrenia. In this qualitative narrative single case study, eleven art therapy sessions are described using non-directive spontaneous art making with a 37-year-old man residing in a psychosocial rehabilitation program. The research study describes this client�s delusional world, and explores the struggle of making sense of his traumatic experiences in early childhood. The themes that emerge in this exploratory study are many and grief and bereavement are the focus as the client uncovers the connections between the past and the present. The process of the art therapy sessions and the progression in the imagery from chaos to serenity is described as the client moves from darkness into light, and as we witness his exploration of space in the images of the whirlwind that reappear throughout the sessions.

Oral narrative ability has received increasing attention over the past three decades, and the importance of children's oral narrative skills to academic achievement has been well established. Children with reading disabilities are known to demonstrate difficulties in the ability to produce and comprehend oral narratives (Roth & Spekman, 1986; Snyder & Downey, 1991). However, the nature of the relationship between oral narrative ability and reading comprehension performance in children with reading disability is not clear. The experiments reported in this thesis aim to address this issue. The following questions are asked: 1) Do deficits in oral narrative ability contribute to reading comprehension difficulties? and 2) What is the likely direction of the relationship between aspects of oral narrative ability and reading comprehension performance in children with reading disabilities? Fourteen children (aged between 6;4 and 7;8 at the initial assessment) with mixed reading disability (MRD: i.e., children who demonstrate both word recognition and listening comprehension deficits) participated in the study. Their oral narrative skills were compared to those of their chronological age-matched peers with typical development (TD) and their reading-age-matched peers with typical development (RMTD). The study consisted of three phases: 1) A longitudinal phase in which the children's oral narrative performance was assessed on three occasions over a two-year period; 2) An intervention phase (using a nonequivalent pretest-posttest control group design) in which 10 children participated in an oral narrative intervention program that focused on enhancing children's story structure knowledge; and 3) A follow-up assessment phase conducted eight months post-intervention. Oral narratives were elicited in a personal narrative context and in a story retelling context. Oral narrative production ability was analysed at macrostructure (story quality) and microstructure (morpho-syntax and vocabulary) levels. Oral narrative comprehension was assessed in a fictional story context through questions relating to story structure elements. Reading comprehension performance was assessed using a standardised test of reading ability. The results from the longitudinal study showed that the children with MRD demonstrated inferior oral narrative production and oral narrative comprehension performance compared to their peers with typical reading development at each assessment occasion. When comparing the poor readers' performance to the RMTD group at the third assessment trial, the results suggested that the children with MRD demonstrated a specific deficit in oral narrative comprehension. In contrast, a pattern of delay was observed on the microstructure measures of oral narrative performance. The results from the intervention indicated significant treatment effects with large effect sizes for oral narrative comprehension performance. Despite this improvement in oral narrative comprehension, there was little change in oral narrative production ability, and transfer to reading comprehension was not evident. Although the follow-up assessment indicated sustained improvement in oral narrative comprehension for the children with MRD, accelerated reading comprehension progress was not evident. The findings from the longitudinal case study highlighted the benefits of oral narrative intervention for a child considered at high risk of continuing academic difficulties. This thesis provides evidence of the persistent oral narrative difficulties in children with MRD. The findings also provide support for the importance of narrative structure knowledge to these poor readers' oral narrative comprehension performance. The results demonstrate that oral narrative comprehension ability explains only a small amount of the variance in reading comprehension performance. Rather, the persistent word recognition difficulties of the children with MRD exert the biggest influence on their reading comprehension performance. These results are discussed in terms of current models of reading and language development. Implications for clinical practice are also addressed.

Diss. (sammanfattning) Stockholm : Karol. inst., 2003. / Härtill 4 uppsatser.

Diss. (sammanfattning) Linköping : Linköpings universitet, 2006. / Härtill 5 uppsatser.

Diss. (sammanfattning) Stockholm : Karolinska institutet, 2006. / Härtill 4 uppsatser.

Thesis (M.A. (Population and Reproductive Health Research))--Mahidol University, 2008. / LICL has E-Thesis 0043 ; please contact computer services.

Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 1996. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.