An analysis of the changes to the mechanical and acoustical properties of paper caused by the damage mechanisms present in the fibre structure

This paper will analyse two of the likely damage mechanisms present in a paper fibre matrix when placed under controlled stress conditions: fibre/fibre bond failure and fibre failure. The failure process associated with each damage mechanism will be presented in detail focusing on the change in mechanical and acoustic properties of the surrounding fibre structure before and after failure. To present this complex process mathematically, geometrically simple fibre arrangements will be chosen based on certain assumptions regarding the structure and strength of paper, to model the damage mechanisms. The fibre structures are then formulated in terms of a hybrid vibro-acoustic model based on a coupled mass/spring system and the pressure wave equation. The model will be presented in detail in the paper. The simulation of the simple fibre structures serves two purposes; it highlights the physical and acoustic differences of each damage mechanism before and after failure, and also shows the differences in the two damage mechanisms when compared with one another. The results of the simulations are given in the form of pressure wave contours, time-frequency graphs and the Continuous Wavelet Transform (CWT) diagrams. The analysis of the results leads to criteria by which the two damage mechanisms can be identified. Using these criteria it was possible to verify the results of the simulations against experimental acoustic data. The models developed in this study are of specific practical interest in the paper-making industry, where acoustic sensors may be used to monitor continuous paper production. The same techniques may be adopted more generally to correlate acoustic signals to damage mechanisms in other fibre-based structures.

Lives in limbo : voices of refugees under temporary protection

Lives in Limbo contains the words of 35 recognised refugees languishing in Australia on temporary protection visas. But it is not merely a succession of stories. It locates these experiences solidly within the historical, political and legal context in which they are endured.

The protection of political communication under the Australian constitution

Compatibility of a law with implied freedom of political communication - application of test of constitutionality outlined in Lange case - argues that two-tier approach be abandoned - if a law regulates the content of a political communication, not its mode, more rigorous judicial scrutiny will follow - should be a single test for constitutionality where application is through the proportionality framework and informed by the rationale of the implied freedom - application to Australian racial vilification laws.

Corporate donations, the best interest of the company and the proper purpose doctrine

Corporate philanthropy is illegitimate spending by powerful corporate elite of someone else’s money; an attempt to bypass democratic allocation of taxes; philanthropy by individuals is laudable, but not by corporations.

Just as I wouldn’t want you to implement your personal judgments by writing checks on my bank account for charities of your choice, I feel it inappropriate to write checks on your corporate ‘bank account’ for the charities of my choice.

Income security of international students in Australia

Growth in the number of international students studying in English language countries has slowed in recent years and this development has generated extended debate amongst university managers and policy makers. In these discussions much attention has focussed on whether the slow down is to be explained by currency realignments, visa requirements, the quality of education, or the increasing competitiveness of the international education market. But what has attracted little attention is the fact that when parents and students choose in which country they will purchase a foreign education their choice is commonly influenced by the level of security that is perceived to characterise the range of options. What security means can take many forms and in this paper we focus on income security. Drawing on interview data from 9 Australian universities, we clarify the sources of international student income, the extent to which these students experience income security/insecurity, how they cope with income difficulties and/or ensure finances do not become a serious problem, and whether the nature of the information provided by governments and universities helps explain the extent of income insecurity manifest amongst international students in Australia. We argue that a significant proportion of international students studying in Australia do experience income insecurity and suggest that for both moral and economic reasons the government and the university sector should pay increased attention to this aspect of student need.

Social inclusion, social movements, and the characteristics of late modernity

In discussing the ideology of social inclusion, this paper demonstrates that the composition of community groups in a period of late modernity is worthy of consideration. Although it would appear, on the surface at least, that previously stable community institutions, such as family, organised religion, trade unions, occupation and residential stability, and so on, are being challenged by a broad rejection of the once powerful tool of tradition, society's attachment to a belief in the symbolic value of community remains strong. In an environment however, in which the interaction and interdependence of human activity is subject to continual re-evaluation as the current processes of industrialisation and globalisation unfold, the template of what constitutes 'community' may need to be re-defined. It is to this end that the present paper is concerned, in that it seeks to identify new community formations. Of particular interest, is the rise and reach of modern day 'social movements', and why, when analysing the subject from a macro-sociological perspective, they have come to assume such a pivotal role in occupying community spaces left vacant by the demise of traditional social institutions. The paper is exploratory in its focus, using relevant literature to posit some broad theoretical themes, with the aim of presenting such themes to encourage a shift in community debates away from traditional concerns about 'who' and 'how many', towards questions of why new community forms are emerging.