Recovery and Purification of Titanium Dioxide and Aluminium Compounds from Corundum By-product of the TiPro Process

The TiPro process developed at the University of Waikato utilises an aluminothermic reaction to create titanium rich intermetallic alloys or alloy powders by solid-liquid separation. The product is then reduced with calcium vapour or calcium hydride to lower the oxygen content. This process involves intimately mixing titanium oxide powder with stoichiometric quantities of aluminium powder and heating the mixture to initiate a thermite reaction that transfers oxygen from the titanium oxide to the aluminium to produce titanium aluminide alloy and aluminium oxide. The liquid alloy is drained off from the by-product, called corundum, before going on to further processing. The corundum is left behind and contains significant quantities of valuable titanium alloy and aluminium and titanium oxides which must be recovered to increase the efficiency and lower the cost of the process. This thesis describes and explains proof-of-concept wet chemistry methods of processing the corundum by-product to recover and separate the valuable metal oxides. Using acid-base equilibria, over 90% of the titanium was recovered from the corundum phase as impure titanium oxide. Aluminium was recovered as aluminium hydroxide and aluminium oxide, both of which can be processed into feedstock for fresh aluminium smelting and hence represent a potential revenue stream. The products were characterised using SEM-EDX and XRD to determine their composition and structure. The proposed treatment produces no waste other than environmentally benign neutral salt water

Plugging the attention deficit: perceptual load counters increased distraction in ADHD

Objective: Increased vulnerability to extraneous distraction is a key symptom of Attention-Deficit Hyperactivity Disorder (ADHD), which may have particularly disruptive consequences. Here we apply Load Theory of attention to increase understanding of this symptom, and to explore a potential method for ameliorating it. Previous research in nonclinical populations has highlighted increased perceptual load as a means of improving the ability to focus attention and avoid distraction. The present study examines whether adults with ADHD can also benefit from conditions of high perceptual load to improve their focused attention abilities. Method: We tested adults with ADHD and age- and IQ-matched controls on a novel measure of irrelevant distraction under load, designed to parallel the form of distraction that is symptomatic of ADHD. During a letter search task, in which perceptual load was varied through search set size, participants were required to ignore salient yet entirely irrelevant distractors (colorful images of cartoon characters) presented infrequently (10% of trials). Results: The presence of these distractors produced a significantly greater interference effect on the search RTs for the adults with ADHD compared with controls, p = .005, ηp² = .231. Perceptual load, however, significantly reduced distractor interference for the ADHD group and was as effective in reducing the elevated distractor interference in ADHD as it was for controls. Conclusions: These findings clarify the nature of the attention deficit underlying increased distraction in ADHD, and demonstrate a tangible method for overcoming it. (PsycINFO Database Record (c) 2013 APA, all rights reserved)

High temperature reliability of power module substrates

The thermal cycling reliability of candidate copper and aluminium power substrates has been assessed for use at temperatures exceeding 300°C peak using a combination of thermal cycling, nanoindentation and finite element modelling to understand the relative stresses and evolution of the mechanical properties. The results include the relative cycling lifetimes up to 350°C, demonstrating almost an order of magnitude higher lifetime for active metal brazed Al / AlN substrates over Cu / Si3N4, but four times more severe roughening and cracking of the Ni-P plating's on the Al / AlN (DBA) substrates. The nonlinear finite element modelling illustrated that the yield strength of the metal and the thickness of the ceramic are the main stress controlling factors, but comparisons with the cycling lifetime results demonstrated that the fracture toughness (resistance) of the ceramic is the over-riding controlling factor for the overall passive thermal cycling lifetimes. In order to achieve the highest substrate lifetime for the highly stressed high temperature thermal cycled applications, the optimum solution appears to be annealed copper, brazed on to a thicker than normal or higher fracture toughness Si3N4 ceramic

Perspectives on the Missiological Legacy of Martin Luther and the Protestant Reformation

Upon the occasion of the 500th anniversary Martin Luther’s publication of his 95 theses, this composite article brings together five perspectives on the missiological legacy of the reformer and the subsequent Protestant Reformation. The blend of voices makes clear that Luther and the subsequent Protestant Reformation do not have a simple missiological legacy but rather various legacies: theological, ecclesiological, political, and practical; some of which co-exist, and even collide, in the same ecclesiastical community. The scandalous legacy of a splintered and splintering church remains. Yet, demonstrations of mutual recognition, reciprocal respect, and genuine fellowship can be found in certain missiological circles

A Tool and Methodology for Rapid Assessment and Monitoring of Heritage Places in a Disaster and Post- Disaster Context – Syria as a Case Study

Over the past decade, cultural heritage in the Middle East and North Africa has been at risk of irreparable damage through conflict, looting, and cessation of official monitoring and development controls. Various organizations are seeking to monitor and record the extent of damage through satellite imagery and media reports. While the remote assessment of cultural heritage sites and buildings has the advantage of allowing for monitoring of cultural heritage properties from afar, its main limitation is the reduced level of certainty and accuracy in the assessment. It is therefore also essential to have tools and methods in place for on-the-ground condition assessment and systematic recording of data, for use as and when opportunities arise. In the Syrian context, given the threats and damage to archaeological sites, museum collections, libraries and archives, it is essential to develop strategies for emergency recording, assessment and response, and to build up local expertise and provide technical assistance in order to safeguard Syria’s rich cultural heritage. This paper presents the approaches used in the development of a pilot Historic Environment Record (HER) for Syria which began life as an initiative of the advocacy organization Shirīn, and which has since undergone considerable development. It describes the methodologies and standards developed for use in a geodatabase to provide a systematic way to undertake and record rapid and on the ground condition and risk assessments of cultural heritage. The system is being customized to meet post-war/disaster challenges including emergency recording, measuring of damage and threat, and prioritization of resources and intervention activities. The database aims to set procedures for carrying out systematic rapid condition assessment (to record damage) and risk assessment (to record threat and level of risk) of heritage places, on the basis of both on the ground assessment and remote sensing. Given the large number of heritage properties damaged by conflict in the MENA region, the implementation of rapid assessment methods to identify quickly and record level of damage and condition is essential, as these will provide the evidence to support effective prioritization of efforts and resources, and decisions on the appropriate levels of intervention and methods of treatment. Although the initial work of the research project came out of the ongoing conflict in Syria, this database and methodology has since been developed and implemented as part of the multi-institutional project Endangered Archaeology in the Middle East and North Africa (EAMENA). Given the general lack of appropriate emergency response and assessment databases, this system could also be applied in other regions facing similar threats and damage from conflict or natural disasters