A post-contact Aboriginal mortuary tree from southwestern Victoria, Australia

Here we document the investigation of the first Australian Aboriginal mortuary tree found since the early 20th century and the first studied by archaeologists and Aboriginal traditional owners. In 2001, a landowner discovered Aboriginal skeletal remains inside a fallen, dead tree while evaluating the tree’s potential as firewood, leading to the investigation of the site. The tree was located near Moyston, in southwestern Victoria, in traditional Djab Wurrung country and held the partial skeletons of three Aboriginal individuals—two adults and a child. Clay pipe-stem wear on several teeth belonging to the two adults indicates that these remains were broadly contemporaneous secondary placements from the early post-contact period (ca. A.D. 1835–1845). Along with five additional mortuary trees within 30 km of the Moyston tree, this practice constitutes a previously unknown traditional mortuary pattern and contributes to our understanding of the complex mortuary behavior of the Aboriginal people of southwestern Victoria.

Fracturing the façade : exploring the impact of childhood sexual abuse

Examination of previous empirical literature illustrates how researchers have concentrated on documenting the impact of childhood sexual abuse (CSA) on the later psychological functioning of survivors, through comparisons with those who have not had such a history. Only more recently has there been a focus on assessing the relationship between aspects of the abuse and specific psychological difficulties. This thesis investigated the relationships between CSA characteristics and women’s later psychological adjustment. The role of attributions, coping methods, parenting competency and marital satisfaction were also investigated. Qualitative data on perception of benefit and general reflections of participants were used to explore participants’ self-esteem, locus of control, decisions relating to parenting, disclosure experiences, and attributions in relation to their abuse, including the search for meaning. Recruitment through newspapers and counselling services led to 118 women volunteering to complete a questionnaire evaluating the characteristics of their CSA and their current psychological adjustment. Of this group, 33 subsequently volunteered to participate in a telephone interview that explored in greater depth issues related to the long-term impact of their CSA. Both quantitative and qualitative analyses were conducted on the data. The women reported a high prevalence of dysfunction in their families of origin. Abuse had generally commenced by middle childhood, and lasted for a number of years and often involved a number of perpetrators. Perpetrators were most likely to be intrafamilial, with stepfathers being over-represented. Sexual activities generally involved physical contact, with participation often induced by the use of coercion. Participants demonstrated significant difficulties in psychological adjustment, but attributions regarding the abuse improved over time. Some concerns were expressed regarding parenting competency, and avoidant coping methods were favoured. In general, participants were satisfied with their current marital relationship. Significant associations were found between coping methods, attributional style, beliefs and various psychological adjustment measures. Participants, in general, demonstrated low self-esteem and displayed an external locus of control. As a consequence of their experience of CSA, many participants reported they had decided not to have children. For those who did have children, CSA was almost universally seen as having had an impact on their parenting. Disclosure of CSA was usually delayed for a number of years, with poor outcomes generally resulting from disclosure when it occurred. Women with current partners rated them as very caring and not controlling. Participants were generally still searching for meaning in their abuse, despite many having accepted it. Survivors outlined an extensive range of long-term effects of CSA, and nominated a number of strategies that would assist in reducing these effects. The results of the study indicated that there are a number of characteristics associated with CSA which signal a higher risk of difficulties in psychological adjustment. Concerns of survivors regarding parenting were confirmed according to those who undertook this role. Unfortunately, concerns expressed by survivors that disclosure of their CSA would have had negative consequences was usually the case when they did finally disclose. However, the accessing of social and family support appeared to have an important role in changing the attributions of survivors regarding their CSA. Furthermore, change of attributions in relation to abuse may provide the key to resilience in survivors against the negative impact of CSA on later psychological adjustment.

Photography towards painting : the techniques of large contact negatives

Investigates the relationship between painting and photography, with a special focus on techniques using large contact negatives and digital applications. The thesis is comprised of a written exegesis that contextualises and informs upon an exhibition of photographic and digital inkjet montages. It discusses the theoretical and structural issues underpinning the conceptual basis of the research and elaborates upon the applications and processes involved in producing each exhibited image.

Determinants of time-to-contact judgements

The experiments reported in this thesis investigated the visual information used by observers to judge the time-to-contact (TTC) of approaching objects. The results provide support for the proposition that TTC judgements are based on retinal image expansion rate and observers' prior experience with the objects.

Contact with nature and children's mental, emotional, and social health

This research investigated the benefits of children's contact with nature as perceived by adult educators. It was found that contact with nature is perceived to: increase self-confidence and self-esteem; provide opportunities to experience mystery, privacy, and sensory engagement; connect children with school; and accommodate different learning styles and abilities.

Investigation of the postcure reaction and surface energy of epoxy resins using time-of-flight secondary ion mass spectrometry and contact-angle measurements

Time-of-flight secondary ion mass spectrometry (ToF-SIMS) was used to investigate correlations between the molecular changes and postcuring reaction on the surface of a diglycidyl ether of bisphenol A and diglycidylether of bisphenol F based epoxy resin cured with two different amine-based hardeners. The aim of this work was to present a proof of concept that ToF-SIMS has the ability to provide information regarding the reaction steps, path, and mechanism for organic reactions in general and for epoxy resin curing and postcuring reactions in particular. Contact-angle measurements were taken for the cured and postcured epoxy resins to correlate changes in the surface energy with the molecular structure of the surface. Principal components analysis (PCA) of the ToFSIMS positive spectra explained the variance in the molecular information, which was related to the resin curing and postcuring reactions with different hardeners and to the surface energy values. The first principal component captured information related to the chemical phenomena of the curing reaction path, branching, and network density based on changes in the relative ion density of the aliphatic hydrocarbon and the C₇H₇O⁺ positive ions. The second principal component captured information related to the difference in the surface energy, which was correlated to the difference in the relative intensity of the C_xH_yN_z⁺ ions of the samples. PCA of the negative spectra provided insight into the extent of consumption of the hardener molecules in the curing and postcuring reactions of both systems based on the relative ion intensity of the nitrogen-containing negative ions and showed molecular correlations with the sample surface energy.

Development of a contact probe incorporating a bragg grating strain sensor for nano coordinate measuring machines

This paper presents a novel optical fibre based micro contact probe system with high sensitivity and repeatability. In this optical fibre probe with a fused spherical tip, a fibre Bragg grating has been utilized as a strain sensor in the probe stem. When the probe tip contacts the surface of the part, a strain will be induced along the probe stem and will produce a Bragg wavelength shift. The contact signal can be issued once the wavelength shift signal is produced and demodulated. With the fibre grating sensor element integrated into the probe directly, the probe system shows a high sensitivity. In this work, the strain distributions along the probe stem with the probe under axial and lateral load are analysed. A simulation of the strain distribution was performed using the finite element package ANSYS 11. Performance tests using a piezoelectric transducer stage with a displacement resolution of 1.5 nm yielded a measurement resolution of 60 nm under axial loading.

Internet-based treatment for panic disorder : does frequency of therapist contact make a difference?

Internet-based interventions with therapist support have proven effective for treating a range of mental health conditions. This study examined whether frequency of therapist contact affected treatment outcomes. Fifty-seven people with panic disorder (including 32 with agoraphobia) were randomly allocated to an 8-week Internet-based cognitive behavioural treatment intervention (Panic Online) with either frequent (three e-mails per week) or infrequent (one e-mail per week) support from a psychologist. Posttreatment, intention-to-treat analyses revealed that both treatments were effective at improving panic disorder and agoraphobia severity ratings, panicrelated cognitions, negative affect, and psychological and physical quality of life domains, with no differences between conditions. High end-state functioning was achieved by 28.6% of the frequent and infrequent participants, respectively. Therapist alliance, treatment credibility, and satisfaction also did not differ between groups, despite significantly greater therapist time invested in the frequent contact condition. The results provide evidence that the effectiveness of Internet-based mental health interventions may be independent of the frequency of therapist support and may, therefore, be more cost-effective than previously reported.

Developmental stress and female mate choice behaviour in the zebra finch

The potential effects of early environmental conditions on adult female mate choice have been largely neglected in studies of sexual selection. Our study tested whether developmental stress affects the mate choice behaviour of female zebra finches, Taeniopygia guttata, when choosing between potential mates. In an experiment manipulating developmental condition, female zebra finches were raised under nutritional stress or control conditions. In adulthood, female preferences were assessed using extensive four-stimulus mate choice trials. Nutritional stress affected growth rates during the period of stress, with experimentally stressed females lighter than controls. During mate choice trials stressed females were almost three times less active than controls and made fewer sampling visits to the stimulus males, although we found no evidence of a direct effect of developmental experience on which males were preferred. Thus, developmental experience had a clear effect on behavioural patterns in a mate choice context. To test whether this effect is specific to a mate choice context, we also investigated the effect of developmental stress on female activity rates in three social contexts: isolation, contact with a conspecific male (a potential mate) and contact with a conspecific female. Here, female activity did not differ between the experimental treatments in any of the social situations. Overall, our findings suggest that environmental conditions during early development can have long-term context-dependent consequences for adult female mate choice behaviour, mediated by changes in activity rates.

A potential novel rapid screening NMR approach to boundary film formation at solid interfaces in contact with ionic liquids

The boundary films generated on a series of inorganic compounds, typical of native films on metal and ceramic surfaces, when exposed to various ionic liquids (ILs) based on the trihexyl(tetradecyl)phosphonium cation have been characterized using multinuclear solid-state NMR. The NMR results indicate that SiO₂ and Mg(OH)₂ interact strongly with the anion and cation of each IL through a mechanism of adsorption of the anion and subsequent close proximity of the cation in a surface double layer (as observed through ¹H−²⁹Si cross polarization experiments). In contrast, Al₂O₃, MgO, ZnO, and ZrO₂ appear less active, strongly suggesting the necessity of hydroxylated surface groups in order to enhance the generation of these interfacial films. Using solid-state NMR to characterize such interfaces not only has the potential to elucidate mechanisms of wear resistance and corrosion protection via ILs, but is also likely to allow their rapid screening for such durability applications.

Sliding distance, contact pressure and wear in sheet metal stamping

This paper directly examines the contact sliding distance experienced during a typical sheet metal stamping process-an area that has largely been neglected in the literature. A method to numerically quantify the sliding distance is proposed. The sliding distance predicted from this method, and the contact pressure obtained from numerical simulation, allow the recently identified time-dependent contact conditions on the die and blank surfaces to be completely characterized. Consequently, a new insight into the wear/galling that occurs at the die radius in sheet metal stamping is gained. The results show that the region close to zero degrees on the die radius is likely to experience the most wear, with the identified transient stage contributing to a large proportion of the total wear. Additionally, the region on the blank surface often observed to be heavily burnished - the die impact line - is estimated to experience the highest wear severity due to the transient contact conditions. The proposed method to numerically quantify the sliding contact conditions can be applied as a general approach to study any other two-body sliding contact situations.