Acoustic features involved in the neighbour-stranger vocal recognition process in male Australian fur seals

Many territorial species have the ability to recognise neighbours from stranger individuals. If the neighbouring individual is assumed to pose less of a threat, the territorial individual responds less and avoids unnecessary confrontations with familiar individuals at established boundaries, thus avoiding the costly energy expenditure associated with fighting. Territorial male Australian fur seals respond more to strangers than to neighbouring males. The present study evaluated which acoustic features were important in the neighbour–stranger recognition process in male Australian fur seals. The results reveal that there was an increase in response strength or intensity from males when they heard more bark units, indicating the importance of repetition to detect a caller. However, lengthening and shortening the inter-unit spaces, (i.e. changing the rhythm of the call) did not appear to significantly affect an animal's response. In addition, the whole frequency spectrum was considered important to recognition with results suggesting that they may vary in their importance. A call containing the dominant and surrounding harmonics was considered important to a male's ability to recognise its neighbour. Furthermore, recognition occurs even with a partial bark, but males need to hear between 25 and 75% of each bark unit from neighbouring seals. Our study highlights which acoustic features induce stronger or weaker responses from territorial males, decoding the important features in neighbour–stranger recognition.

Emptiness and becoming : integrating Madhyamika Buddhism and process philosophy

Beginning with a comparison of process philosophy and Madhyamika Buddhism -focussing in particular on Charles Hartshorne and Nagarjuna - which seeks to find points of similarity and difference, this thesis goes on to ask whether the differences are disagreements or complementary insights that may be integrated by means of a hermeneutical framework which can facilitate the enrichment of both systems. It is argued that process philosophy's method of creative synthesis and Madhyamika's method of negative dialectics are complementary rather than rival methods, because: (1) the Madhyamika bi-negation of symmetrical internal and external relations is complemented by process philosophy's argument that asymmetrical relations have primacy, which can be integrated into a theory of 'asymmetrical interdependence'; (2) the Madhyamika bi-negation of being and non-being is complemented by process philosophy's argument that becoming has primacy; (3) Madhyamika's emptiness (or openness) and process philosophy's creativity are complementary ideas that can be integrated into a ‘creative emptiness’; (4) Madhyamika's deconstruction of theism and acceptance of a conventional (and thus empty) ‘Cosmic Buddha-Bodhisattva’ and process philosophy's panentheism are complementary and can be integrated in the idea of an ‘empty God’; (5) The creative emptiness and the empty God are two different but complementary ultimates - the ultimate activity and the ultimate actuality; (6) Madhyamika’s two truths -conventional (empty world) and ultimate (emptiness) - can be enriched by expanding the conventional to include ultimate actuality (empty God), and not subordinating the conventional to the ultimate; (7) process philosophy can be similarly enriched by meditating on creative emptiness, which reveals the empty God-world, which is not dominant vis-a-vis creative emptiness. An attempt is made to develop a hermeneutical framework for the comparison and integration of Madhyamika and process thought, which can also be used to construct a general theory of worldviews and a theory of interreligious dialogue. Finally, the practical applications of the integration of process thought and Madhyamika Buddhism are explored, focussing on ethical and socio-political issues and how the integration of the two systems can be used to advantage in these contexts.

A panel error correction approach to explore spatial correlation patterns of the dominant housing market in Australian capital cities

Purpose - A panel error correction model has been developed to investigate the spatial correlation patterns among house prices. This paper aims to identify a dominant housing market in the ripple down process. Design/methodology/approach - Seemingly unrelated regression estimators are adapted to deal with the contemporary correlations and heterogeneity across cities. Impulse response functions are subsequently implemented to simulate the spatial correlation patterns. The newly developed approach is then applied to the Australian capital city house price indices. Findings - The results suggest that Melbourne should be recognised as the dominant housing market. Four levels were classified within the Australian house price interconnections, namely: Melbourne; Adelaide, Canberra, Perth and Sydney; Brisbane and Hobart; and Darwin. Originality/value - This research develops a panel regression framework in addressing the spatial correlation patterns of house prices across cities. The ripple-down process of house price dynamics across cities was explored by capturing both the contemporary correlations and heterogeneity, and by identifying the dominant housing market.

The influence of residual stress on a roll forming process

Roll forming is increasingly used in the automotive industry to form High Strength Steel (HSS) and Advanced High Strength Steel (AHSS) for structural components. Because of the large variety of applications of roll forming in the industry, Finite Element Analysis (FEA) is increasingly utilized for roll forming process design. Bending is the dominant deformation mode in roll forming and sheet materials used in the process are often temper rolled (skin passed), roller- or tension-levelled. These processes introduce residual stresses into the material, and recent studies have shown that those affect the material behaviour in bending. A thickness reduction rolling process available at Deakin that leads to material deformation similar to an industrial temper rolling operation was used in this study to introduce residual stresses into a dual phase, DP780, steel strip. The initial and thickness reduced strips were then used in a 5-stand experimental V-section roll forming set-up to identify the effect of residual stress on the final shape. The influence of residual stress and the effect of plastic deformation on the material behaviour in roll forming are separately determined in numerical simulation. The results show that the thickness reduction rolling process decreases the maximum bow height while the springback angle and end flare increase. Comparison with experimental results shows that using material data from the conventional tensile test in a numerical simulation does not allow for the accurate prediction of shape defects in a roll forming process if a residual stress profile exists in the material. On the other hand including the residual stress information leads to improved model accuracy.