19 resultados para Disintegration

em Deakin Research Online - Australia


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Fragmentation in Indonesia is by far the most critical issue now facing the state. This book analyses social unrest, autonomy and separatism in the wake of the Indonesian economic crisis, placing them in the context of state evolution, and looking at the competing aims of economic and political globalisation with local agendas.

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Alkali-activated slag can totally disintegrate when exposed to 50 C. This paper presents a study of possible solutions to avoid this disintegration by using silica fume (SF) and fly ash (FA) to partially replaceslag. It was found that partial replacement of slag with SF significantly reduces strength loss. A mixture of 50% slag 50% SF (cured at 25 and 60 C) showed no strength loss after the exposure. In comparison, a55% drop of strength was observed in a mixture of 50% slag 50% FA (cured at 25 C) after the same exposure.However, the strength loss of this mixture was reduced by 50% when cured at 60 C. The presence oflime in AAS pastes increases the degree of strength loss after the exposure. The mechanisms for the abovestrength results are discussed in terms of hydration products and microcracking.

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The compressive strength of alkali-activated slag (AAS) paste can be adversely affected by temperature. AAS paste loses its strength when exposed to 50°C for 24 hours. The objective of the current investigation is to evaluate two different mineral admixtures, i.e. fly ash and silica fume, in preventing AAS paste from strength loss. The effect of the above admixtures at various dosages on strength loss was assessed by measuring the retention of compressive strength of samples after exposed to 50°C. Results indicate that the admixtures reduced strength loss. Compared with the fly ash, the silica fume performs better at preventing AAS paste from strength loss. After exposure to 50°C, the use of silica fume to replace 15% of slag reduces the strength loss by 70%. The possible reason for this is discussed based on x-ray diffraction results.

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Poverty, in its most basic form can be defined as a deprivation of well-being. It is an issue that has been evident in society for centuries and a concern for government policy makers and more recently for non-government organizations (NGOs). In this paper, we consider how management approaches to resolving the dilemma of poverty can be advanced by drawing on two major areas in the development arena associated with poverty, namely, ‘social exclusion’ and ‘the human development paradigm’. We put forward the argument that for groups of people where social disintegration has already occurred, only structural interventions coupled with a social development mechanism will achieve the desired effect. One method for achieving this is through the use of microfinance programs which provide a broad range of financial services to the poor and low-income households as well as to micro-enterprises. This paper contributes to both management practice and theory by developing a theoretical model that microfinance institutions need to do to aid both ‘human development’ and ‘social inclusion’ processes for the socially excluded and poor.

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All Australian Aborigines have experienced the impact of Western culture to some extent which has resulted in the traditional cultures being irrevocably decimated. The reaction to the disintegration of traditional culture has been marked by a variety of outcomes. While some Aborigines have either accepted or reached a level of accommodation to the new order, others have responded in maladaptive ways. For some Aborigines, the disintegration of traditional culture and society has generated conflict, confusion and the disintegration of personality, which is conducive to the evolution of a dysfunctional group. It is the circumstances of and policy responses to dysfunctional Aboriginal groups, therefore, that is the concern of this article.

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All Australian Aborigines have experienced the impact of Western culture to some extent, which has resulted in the traditional cultures being irrevocably decimated. The reaction to the disintegration of traditional culture has been marked by a variety of outcomes. While some Aborigines have either accepted or reached a level of accommodation to the new order, others have responded in maladaptive ways. For some Aborigines, the disintegration of traditional culture and society has generated conflict, confusion and the disintegration of personality, which is conducive to the evolution of a dysfunctional group. It is the circumstances of, and policy responses to, dysfunctional Aboriginal groups, therefore, that are the concern of this paper.

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The study is focused on an analysis of the major diplomatic documents from the mid eighteenth century to the present as regards Sri Lanka, or Ceylon as it was known till 1972. The objectives of the study are to identify the issues underlying these diplomatic documents. These include the political and strategic factors and other subsidiary issues like trade and commerce relevant at the time these treaties, agreements, and proposed treaties were formulated. It is also a geopolitical study as it relates to Sri Lanka's geographical position in the Indian Ocean, and her possession of the Trincomalee Harbour on its east coast, which is one of the great natural harbours of the world. Over the centuries this harbour has had significant strategic value for naval deployments. The case study of the eighteenth and nineteenth centuries studies the diplomatic documents against the political and strategic background for the French Revolution and actions of Napoleon, and the Anglo/French rivalry, spreading from Europe to North America and Asia. In the twentieth century the environment for studying the place of Sri Lanka in the Indian Ocean was created by the Russian Revolution, the failure to keep the peace of Versailles after World War I, the conflict and horrors of World War II which led to the disintegration of European colonial empires in Asia and Africa, and the tensions generated by the Cold War. A study of the documents would reveal that in international relations what matters is the ability of a party to promote its interests, and this depends on its power. This realist approach contrasts to the idealist approach where policies are based on moral and ethical principles. For the realist the states should follow to protect their interests and to survive. To achieve this is to strive for a ‘balance of power’. To do so is to form a favourable alliance system. As the documents examined cover a period from the mid-eighteenth century to the later part of the twentieth century, they reflect the changing technologies that have had an influence on naval and military matters. For example, this period witnessed great changes in technology of energy utilized to propel warships, from wind, to steam, to fuel and finally to nuclear power. These changes had an influence in determining strategic policies involving weapon systems and communications within a global and regional setting. The period covered was the beginning of the process described a ‘globalisation’. Its idea is not unique to this century; there were many attempts, in various times of history, to integrate societies within a global context. Viewed in this light, the Anglo-French rivalry of the eighteenth and nineteenth centuries was the indication of a global naval strategy, in which Sri Lanka was a major factor in the Indian Ocean region. This process was associated with the phenomena called the ‘expansion of Europe’. It covered all the oceans of the world and in the nineteenth and twentieth centuries led to the founding of the largest maritime empire the world has ever seen: The British Empire. After World War I, the British naval strength (the basis of the British Empire) and her consequent position as a great power, was challenged by other powers like the United States of America and Japan. After World War II, the US Navy was supreme: and there was a close alliance between Britain and the USA. The strength of the US/British alliance was based on the navy and its bases, which were spread throughout the globe; to project power, and act as deterrence and balancing force. Sri Lanka, due to her strategic position, was a part of this evolving process, and was tied to a global strategy (with its regional connotations) from the eighteenth century to the present.

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Biosolids were used to remove zinc, manganese and cyanide from mining wastewaters. The effect of aqueous parameters and reaction variables on contaminant biosorption was quantified. The mechanism of removal was adsorption onto amine and carboxyl functional groups. Immobilisation was investigated to overcome problems of swelling and disintegration of the biosolids.

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This book examines the source of Chinese civilization, foundations of traditional Chinese society and early patterns of power transition. It engages readers in a search for a broad understanding of China's traditional culture and the enduring legacies of the past-in-the-present. It questions the conventional view about China's past, be that of a Confucian, a Communist or a Western ethnocentric historiographer. Most theories concerning the history of China postulate a central culture based on the Yellow River valley and radiating out into the vast areas of what we know as China. Informed by the latest archaeological discoveries, the author points out an alternative view on formation and development of Chinese civilization. Exploring the social and political upheavals that characterized the continuous disintegration and annexation in the 1st millennium BC, the author offers a unique account of the process of periodic fragmentation and amalgamation. Though presented for specialists in the field, virtually every page of this book is intelligible to the lay person, opening a window for anyone interested in the subject to look at this ancient culture from a new angle.

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The aim of this study was to understand the structure and biodegradation relationships of silk particles intended for targeted biomedical applications. Such a study is also useful in understanding structural remodelling of silk debris that may be generated from silk-based implants. Ultrafine silk particles were prepared using a combination of efficient wet-milling and spray-drying processes with no addition of chemicals other than those used in degumming. Milling reduced the intermolecular stacking forces within the β-sheet crystallites without changing the intramolecular binding energy. Because of the rough morphology and the ultrafine size of the particles, degradation of silk particles by protease XIV was increased by about 3-fold compared to silk fibers. Upon biodegradation, the thermal degradation temperature of silk increased, which was attributed to the formation of tight aggregates by the hydrolyzed residual macromolecules. A model of the biodegradation mechanism of silk particles was developed based on the experimental data. The model explains the process of disintegration of β-sheets, supported by quantitative secondary structural analysis and microscopic images. © 2012 American Chemical Society.

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Two distinct substructures were produced in a Ni-30Fe austenitic model alloy by different thermomechanical processing routes. The first substructure largely displayed organized, banded subgrain arrangements with alternating misorientations, resulting from the deformation at a strain just before the initiation of dynamic recrystallization (DRX). By contrast, the second substructure was more random in character and exhibited complex subgrain/cell arrangements characterized by local accumulation of misorientations, formed through DRX. During the post-deformation annealing, the latter substructure revealed a rapid disintegration of dislocation boundaries leading to the formation of dislocation-free grains within a short holding time, though the former largely preserved its characteristics till becoming replaced by growing statically recrystallized grains.

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Australian regional city regeneration in Australia is increasingly becoming an important topic as they attempt to position themselves mid-way between larger discourses about capital cities and peri-urban landscapes. Historically these cities, like Newcastle, Wollongong and Geelong, have been marginalised in infrastructure and planning support systems, yet subject to erratic Commonwealth and State funded initiatives that have divested major specific-purpose complexes into their cities. Such has been as a consequence of of 'decentralisation' and 'regionalisation' political platforms, but also to address employment and voting needs. As an example, Geelong embraced contemporary industrialism, particularly automotive, and built on its port and wool export capacities. Politics, intransigence and lack of economic investment compounded the failure to create quality urban fabric and enable innovative planning. With this legacy, this regional city finds itself at the cusp of heavy industry disintegration, education and health sectorial growth, population increases aided by regional escapism, and a lethargic city centre. In attempting to redress these trends, Geelong is consciously attempting to re-image itself, regenerate key sections of its urban fabric, but also manage the regional escapism (sea change / tree change) phenomena. This paper critiques the larger context, and then uses three examples - "Vision 2" in the city centre, the Mega Port proposal, Fyansford Green and the Moolap salt marsh - as foils to reflect whether these initiatives are and can assist the facilitation of city structural change, economic renewal and enhanced urban design and place-making outcomes.

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The present work investigated the evolution of strain-induced NbC precipitates in a model austenitic Fe-30Ni-Nb steel deformed at 925 °C to a strain of 0.2 during post-deformation holding between 3 and 1000 s and their effect on the reloading flow stress. The precipitate particles preferentially nucleated on the nodes of the periodic dislocation networks constituting microband walls. Holding for 10 s resulted in the formation of fine, largely coherent NbC particles with a mean diameter of ∼5 nm, which displayed a cube-on-cube orientation relationship with austenite and caused the maximum increase in the reloading steady-state flow stress. A further increase in the holding time from 30 to 1000 s led to the formation of semi-coherent, gradually coarser and more widely spaced particles with a mean diameter of 8 nm and above, which led to a gradual decrease in the reloading steady-state flow stress. The holding time increase resulted in progressive disintegration of the dislocation substructure and dislocation annihilation through static recovery processes, which was also reflected by the measured softening fractions. The precipitate particle shape changed during post-deformation annealing from elliptical to faceted octahedral and subsequently to tetra-kai-decahedral. © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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With the expected theoretical capacity of 2596 mA h g-1, phosphorus is considered to be the highest capacity anode material for sodium-ion batteries and one of the most attractive anode materials for lithium-ion systems. This work presents a comprehensive study of phosphorus-carbon nanocomposite anodes for both lithium-ion and sodium-ion batteries. The composite electrodes are able to display high initial capacities of approximately 1700 and 1300 mA h g-1 in lithium and sodium half-cells, respectively, when the cells are tested within a larger potential windows of 2.0-0.01 V vs. Li/Li+ and Na/Na+. The level of demonstrated capacity is underpinned by the storage mechanism, based on the transformation of phosphorus to Li3P phase for lithium cells and an incomplete transformation to Na3P phase for sodium cells. The capacity deteriorates upon cycling, which is shown to originate from disintegration of electrodes and their delamination from current collectors by post-cycling ex situ electron microscopy. Stable cyclic performance at the level of ∼700 and ∼350-400 mA h g-1 can be achieved if the potential windows are restricted to 2.0-0.67 V vs. Li/Li+ for lithium and 2-0.33 vs. Na/Na+ for sodium half-cells. The results are critically discussed in light of existing literature reports