Flexible life-history traits and dispersal may allow generalist populations to persist across a range of habitats despite experiencing contrasting selection pressures. Invertebrates exploiting temporary ponds must develop quickly and disperse as adults, or have wide environmental tolerances. Conversely, permanent-pond invertebrates must avoid a suite of predators (e.g., fish and dragonflies). This gradient of pond permanence can result in life-history trade-offs that influence fitness, population dynamics, and genetic structure. In addition, recruitment between habitats may balance juvenile life-history trade-offs and be crucial to sustain generalist invertebrate populations in ponds with unpredictable hydrology. Through a multi-year survey of three pond complexes in the Canterbury high-country and a series of mesocosm experiments using two generalist pond invertebrates, Xanthocnemis zealandica damselflies and Sigara arguta waterboatmen, I found these two species had alternative life-history strategies that influenced their distributions across the pond-permanence gradient. With longer juvenile development, X. zealandica benefited from flexible life-history traits: temporary-pond X. zealandica had accelerated development and short-term desiccation tolerance, but were excluded from ponds with long dry periods, whereas, permanent-pond X. zealandica had extended development and predator avoidance behaviours (e.g., reduced movement and refuge-use). In contrast, S. arguta had an opportunistic life-history strategy with a fixed, rapid development response that allowed them to inhabit more temporary ponds, but they were intolerant of drying and limited to permanent ponds that contained shallow refuges from fish. These results illustrate how alternative life-history strategies enabled two generalist species to achieve broad realised niches. Recruitment between habitats also appeared to be important for balancing trade-offs and maintaining meta-populations across the pond-permanence gradient. To evaluate the importance of X. zealandica dispersal among and within pond complexes I used microsatellite analyses. While there was unique genetic population structure between the North and South Islands, at lower spatial scales there was little variability in genetic diversity and limited genetic structure in populations, likely due to gene flow among different habitat types. Overall, this work shows how an interaction of juvenile strategies and adult dispersal could reduce life-history trade-offs, resulting in weak selection pressures across an unpredictable disturbance gradient. Whether increasingly unpredictable hydrological patterns under climate-warming favour generalist species will likely depend on how well generalist life-history traits and dispersal allow exploitation of a range of habitat types and resilience to variable selection pressures. Higher mean summer rainfall in New Zealand may allow both species to exploit more temporary ponds, whereas longer dry periods between extreme precipitation events could limit X. zealandica distributions. Thus, species with generalist strategies are likely to be favoured under warming, but their specific life-history strategies will likely promote or limit their ability to exploit more unpredictable habitats.

This study attempts to answer the question of why some children fail while others succeed in the first year of school when they appear to have at least average abilities and to come from family environments which seem, on the surface at least, to provide similar developmental opportunities. The researcher observed in ten, four-year-old children's homes over a period of four days for each child and followed these intensive home observations with three-monthly, informal interviews with adult family members. Each child was observed in school intensively, on entry to school and every three months following entry until six years of age. Informal interviews were conducted with the class teachers every three months. During the 'intensive' home and school observations continuous hand-written narrative recordings of natural communication incidents were made of all the oral language and activities of the focal child, and of the language and activities of other children and adults when what they said and did was in the vicinity of the focal child. Notes were made of the location, atmosphere, body language, people present, and focal objects throughout the time of the observations. Field notes were made each night after every home, school or pre-school visit. Each child was tested with a battery of tests on entry into school at five years, at five-and-a-half years and at six years. The gathering of these different data meant a wide variety of information about the child's total ecological environment was gathered. A variety of ways for examining the data for a relationship between the behaviours and social experience of the child which occurred at home and measures of achievement in school were explored. These included a variety of language variables (e. g. exposure to question types, statement types, amount of talk) and measures of variables related to socia-economic status and home environmental factors (e.g. the HOME Scale, Caldwell & Bradley, 1979). Al though some of these variables were significantly correlated with school achievement, it was not clear that the problem of why some children succeeded in school while others failed had been satisfactorily solved. A more detailed analysis of the data was carried out which differed from most other psychological or educational studies in that it focused on the underlying structures of the natural socio-linguistic patterns of interaction in both home and school first year classrooms. The task was to describe observable social interaction in terms of the underlying structures which characterised the home subcultural experience of the children and the sub-cultural learning (acculturation) required of the children in order to successfully adapt to the school environment. The theory generated to explain this complex problem was adapted from a theory sometimes termed script theory, or schema theory. It was developed into a framework which could deal with both children's present school experience and the children's past experience of the structure of meaningful social interactions. The results showed that the underlying structure of patterns of interaction (schema) which the children brought with them from home to school did indeed cause failure for some children at school. The children's experience of patterns of interaction in the homes which were like school patterns of interaction correlated 0.91 with achievement in school. The greater the variety of school-like patterns of interaction occurring in the homes the greater a child's achievement rate was likely to be. This study has implications for classroom organisation, for the structure of classroom patterns of interaction and for young people who come from home ecological environments which are significantly different from the present classroom environment. It is argued that children are our nation's most important resource and we need to examine with great care what we are doing to promote alternative classroom environments.

The smart bookshelf serves as a test-bed to study environments that are intelligently augmented by projector-camera devices. The system utilizes a camera pair and a projector coupled with an RFID reader to monitor and maintain the state of a real world library shelf. Using a simple calibration scheme, the homography induced by the world plane in which book spines approximately lie is estimated. As books are added to the shelf, a foreground detection algorithm which takes into account the projected information yields new pixels in each view that are then verified using a planar parallax constraint across both cameras to yield the precise location of the book spine. The system allows users to query for the presence of a books through a user interface, highlighting the spines of present book using the known locations obtained through foreground detection and transforming image pixels to their corresponding points in the projectors frame via a derived homography. The system also can display the state of the bookshelf at any time in the past. Utilizing RFID tags increases robustness and usefulness of the application. Tags encode information about a book such as the title, author, etc, that can be used to query the system. It is used in conjunction with the visual system to infer the state of the shelf. This work provides a novel foreground detection algorithm that works across views, using loose geometric constraints instead pixel color similarity to robustly isolate foreground pixels. The system also takes into account projected information which if not handled would be detrimental to the system. The intent of this work was to study the feasibility of an augmented reality system and use this application as a testbed to study the issues of building such a system.

Los Entornos Virtuales de Enseñanza y Aprendizaje (EVEA), o Learning Management Systems (LMS), han sufrido una rápida revolución en los últimos cinco años, fundamentalmente aquellos especializados en el sector universitario. Ello ha determinado que en muchas instituciones de Educación Superior hoy en día coexistan varios entornos virtuales, debido a que fueron adoptados por diferentes unidades académicas en diferentes momentos o etapas, o porque algunas de ellas hayan decidido migrar a otro entorno que en últimos tiempos haya dado un salto cualitativo de importancia o se adapte mejor a su realidad institucional. Tampoco hay un consenso en cuanto a determinar cuál es el mejor EVEA ya que en éste terreno intervienen diversos factores tanto institucionales, como políticos y económicos.

A galaxy’s evolution is quite sensitive to the impact of external influences. In this thesis, the impact of external environment from both large and small scale effects is investigated, along with a study of how the HI gas fraction of a galaxy can modulate a galaxy’s response to perturbations by galaxy–galaxy interactions. This thesis makes use of the statistical power of the Sloan Digital Sky Survey Data Release 7 (SDSS DR7) to assemble a large spectroscopic sample of galaxies, select samples of interest, and select control samples of galaxies matched to each galaxy within the sample of interest in mass, redshift, and (if applicable) local density. It is possible to trace a galaxy’s internal gas motions which mark its disturbance by using the metrics of star formation rate (SFR) and gas-phase metallicity. To investigate the influence of large scale environment, a sample of star forming galaxies in a locally dense environment, but relatively isolated from larger scale structure, is constructed. This sample is further divided into groups which are truly isolated from any large scale structure (no cluster potential within 1 Mpc), and those which, in spite of their relative local isolation, are embedded within a larger cluster structure (within 1 Mpc of a cluster). As the local galaxy density is identical between isolated and embedded group structures, a fair comparison between the star forming properties of the galaxies within those group structures can be made. Star forming galaxies whose groups are embedded within a larger structure are found to show statistically lower SFRs than those galaxies whose groups are truly isolated from any larger cluster potential. The impact of local galaxy–galaxy interactions is subsequently considered. Using a sample of star-forming galaxies in pairs from the SDSS DR7, the enhancement in SFRs and the suppression of metallicities is traced as a function of projected separation (rp). The metallicity dilution as a function of rp is presented for the first time. Galaxies in pairs are found to have SFRs and metallicity values which are offset from a carefully selected control sample to separations of at least 80 kpc/h. Using a suite of simulations developed for the purposes of comparison with these observational results, a new interpretive framework is developed for enhancements as a function of rp. To investigate the role that gas fraction plays in moderating the strength of interaction triggered starbursts, new data is obtained from the Jansky Very Large Array (VLA). The VLA data supplements the existing SDSS data with HI gas masses for a subsample of resolvable galaxy pairs at small rp(in kpc/h). HI masses are obtained and gas fractions are calculated for a sample of 34 paired galaxies. A positive correlation is detected at > 2σ between the gas fraction of a galaxy and the SFR enhancement of that galaxy. The work presented in this thesis has expanded the understanding of physical variables, both internal and external, which can change the star forming properties of a galaxy through an examination of tracers of internal gas flows in those galaxies. / Graduate / 0606 / jillian.scudder@gmail.com

A galaxy’s evolution is quite sensitive to the impact of external influences. In this thesis, the impact of external environment from both large and small scale effects is investigated, along with a study of how the HI gas fraction of a galaxy can modulate a galaxy’s response to perturbations by galaxy–galaxy interactions. This thesis makes use of the statistical power of the Sloan Digital Sky Survey Data Release 7 (SDSS DR7) to assemble a large spectroscopic sample of galaxies, select samples of interest, and select control samples of galaxies matched to each galaxy within the sample of interest in mass, redshift, and (if applicable) local density. It is possible to trace a galaxy’s internal gas motions which mark its disturbance by using the metrics of star formation rate (SFR) and gas-phase metallicity. To investigate the influence of large scale environment, a sample of star forming galaxies in a locally dense environment, but relatively isolated from larger scale structure, is constructed. This sample is further divided into groups which are truly isolated from any large scale structure (no cluster potential within 1 Mpc), and those which, in spite of their relative local isolation, are embedded within a larger cluster structure (within 1 Mpc of a cluster). As the local galaxy density is identical between isolated and embedded group structures, a fair comparison between the star forming properties of the galaxies within those group structures can be made. Star forming galaxies whose groups are embedded within a larger structure are found to show statistically lower SFRs than those galaxies whose groups are truly isolated from any larger cluster potential. The impact of local galaxy–galaxy interactions is subsequently considered. Using a sample of star-forming galaxies in pairs from the SDSS DR7, the enhancement in SFRs and the suppression of metallicities is traced as a function of projected separation (rp). The metallicity dilution as a function of rp is presented for the first time. Galaxies in pairs are found to have SFRs and metallicity values which are offset from a carefully selected control sample to separations of at least 80 kpc/h. Using a suite of simulations developed for the purposes of comparison with these observational results, a new interpretive framework is developed for enhancements as a function of rp. To investigate the role that gas fraction plays in moderating the strength of interaction triggered starbursts, new data is obtained from the Jansky Very Large Array (VLA). The VLA data supplements the existing SDSS data with HI gas masses for a subsample of resolvable galaxy pairs at small rp(in kpc/h). HI masses are obtained and gas fractions are calculated for a sample of 34 paired galaxies. A positive correlation is detected at > 2σ between the gas fraction of a galaxy and the SFR enhancement of that galaxy. The work presented in this thesis has expanded the understanding of physical variables, both internal and external, which can change the star forming properties of a galaxy through an examination of tracers of internal gas flows in those galaxies. / Graduate / 0606 / jillian.scudder@gmail.com

Estates of multi-storey housing present some of the most intractable problems for urban policy. Socially, many are characterised by a complex of deprivation. Physically, they often suffer from serious technical problems and poor environmental quality. This study traces the development of multi-storey housing from its early beginnings in the 19th century to the period from the mid-1950s to the early 1970s when most of the contemporary legacy of estates was built. In this period, it is suggested, the concentration on 'low cost' led to the poor design of access systems, the use of untried mass-production techniques and the virtual elimination of social facilities. All these economies sowed the seeds of the social rejection and degeneration that was to follow. The central question is whether such estates can be successfully modernised -or whether the only solution is to demolish them. In seeking an answer the various responses of social landlords are analysed. It emerges that the older, smaller estates can be effectively adapted to provide good housing. The large scale, more recent estates, however, have proved more resistant to improvement. Despite the fact that government has increasingly targeted the problem estates of the 1960s and 70s, many improvement schemes have met with limited success. Drawing on an analysis of past practice, a 'model of regeneration' is defined. This concentrates on the need for tenant participation; on the importance of design solutions which are both technically and socially appropriate; and on management which is sensitive to local needs. This model was tested through case studies on recent improvement schemes. From the results, conclusions are drawn about the value of the model and the prospects for regenerating the various types of multi-storey housing Finally, a strategic approach is defined which can re-form the estates and re-integrate them into the mainstream urban environment.

Creating a city that is both dense and green could result in conflicts. The aim with this report is to describe how the municipality of Malmö works with densification and at the same time creating green environments. Also, the aim is to describe how densification and greenery in the city are problematized by researchers. It was shown in the empirical study that it is a political directive to create a dense and green cite. To be able to create this, all of the interviewees refers to the comprehensive plan of Malmö. The methods the municipality of Malmö uses to create green environments during densification varies from different projects, considers John Lepic. The results in the literature survey show that greenery often is identified as a key ingredient of a sustainable city (Boverket 2002; Jim 2004). In order to systematically create a greener city the spatial planning and data produced in connection with it are important tools (Nordmalm, et al. 1999). To create exciting and interesting environments both quantity and quality are important (Jim 2004). Greenery could be introduced in cities in many ways. Even if the wildest ideas may not be reality, it is possible to get inspiration from these ideas and with their help find new solutions.

This research project takes the form of a creative, reflective and analytic investigation 'through theory and practice' into the role of the artist in enabling 'sustainable' urban environments. My initial focus on a spatial public art practice?s potential contribution to social sustainability should be understood as involving the capacity to contribute lasting benefits toward social well being whether of the individual or the community. My research later challenges the efficacy of this focus and argues for a more holistic approach to sustainability which addresses social, environmental, cultural and economic concerns simultaneously.

Thesis (M. Sc.)--University of Hong Kong, 2007. / Title proper from title frame. Also available in printed format.