Zircon U-Pb Chronometry of the Pressure and Temperature History of Granulites in the Musgrave Ranges, Central Australia

1991 ◽  
Vol 99 (5) ◽  
pp. 675-697 ◽  
Author(s):  
M. A. H. Maboko ◽  
I. S. Williams ◽  
W. Compston
2006 ◽  
Vol 129 (8) ◽  
pp. 966-976 ◽  
Author(s):  
S. W. Paik ◽  
K. D. Kihm ◽  
S. P. Lee ◽  
D. M. Pratt

The spatially and temporally resolved evaporation phenomena of a slowly evaporating water droplet are investigated using a microfabricated gold heater array consisting of 32 linear heater elements (100 μm wide and 15 mm long, each). Each of the gold microheater elements works both as a temperature sensor and as a heater. The experiment is performed under a constant voltage mode to examine the spatially resolved temperature history of the droplet contact surface for a period starting at initial contact with the heater and lasting to the point of complete dryout. The raw data obtained from the linear array have been tomographically deconvolved so that the radial temperature profile can be determined assuming a circular droplet contact surface.


2008 ◽  
Vol 30 (1) ◽  
pp. 137 ◽  
Author(s):  
Will Sanders ◽  
Sarah Holcombe

In light of some basic desert demography, this paper examines governance patterns for small desert settlements. It traces policy histories which led to the emergence of highly localised, single settlement governance arrangements during the 1970s and ’80s. It also identifies the many pushes since within the Northern Territory local government system for more regional, multi-settlement governance structures. The paper goes on to examine the history of one such regional, multi-settlement arrangement in central Australia, the Anmatjere Community Government Council established in 1993. The paper details our work with this Council over the last 4 years on ‘issues of importance or concern’ to them. The paper aims to learn from the ACGC experience in order to inform the more radical restructuring of Northern Territory local government currently underway towards larger multi-settlement regionalism. It concludes with four specific lessons, the most important of which is that regionalism must build on single settlement localism.


Author(s):  
Neil S. Bailey ◽  
Yung C. Shin

A predictive laser hardening model for industrial parts with complex geometric features has been developed and used for optimization of hardening processes. A transient three-dimensional thermal model is combined with a three-dimensional kinetic model for steel phase transformation and solved in order to predict the temperature history and solid phase history of the workpiece while considering latent heat of phase transformation. Further, back-tempering is also added to the model to determine the phase transformation during multitrack laser hardening. The integrated model is designed to accurately predict temperature, phase distributions and hardness inside complex geometric domains. The laser hardening parameters for two industrial workpieces are optimized for two different industrial laser systems using this model. Experimental results confirm the validity of predicted results.


2018 ◽  
Vol 24 (2) ◽  
pp. 321-332 ◽  
Author(s):  
Joseph Bartolai ◽  
Timothy W. Simpson ◽  
Renxuan Xie

Purpose The weakest point in additively manufactured polymer parts produced by material extrusion additive manufacturing (MEAM) is the interface between adjacent layers and deposition toolpaths or “roads”. This study aims to predict the mechanical strength of parts by utilizing a novel analytical approach. Strength predictions are made using the temperature history of these interfaces, polymer rheological data, and polymer weld theory. Design/methodology/approach The approach is validated using experimental data for two common 3D-printed polymers: polycarbonate (PC) and acrylonitrile butadiene styrene (ABS). Interface temperature history data are collected in situ using infrared imaging. Rheological data of the polycarbonate and acrylonitrile butadiene styrene used to fabricate the fused filament fabrication parts in this study have been determined experimentally. Findings The strength of the interfaces has been predicted, to within 10% of experimental strength, using polymer weld theory from the literature adapted to the specific properties of the polycarbonate and acrylonitrile butadiene styrene feedstock used in this study. Originality/value This paper introduces a novel approach for predicting the strength of parts produced by MEAM based on the strength of interfaces using polymer weld theory, polymer rheology, temperature history of the interface and the forces applied to the interface. Unlike methods that require experimental strength data as a prediction input, the proposed approach is material and build orientation agnostic once fundamental parameters related to material composition have been determined.


Author(s):  
Ian McLean

Albert Namatjira was the leading artist of the modern Aboriginal watercolor art movement at the Hermannsburg (Ntaria) Lutheran mission in Central Australia. He was the first Aborigine to be recognized as a professional artist, to make a good living from his art, and gain national acclaim. The turning point in his life occurred in 1934, when two visiting landscape artists, Rex Battarbee and John Gardiner, exhibited paintings of the local scenery at the mission. Already a talented craftsman with a reputation at the mission for his artefacts and poker-worked designs, Namatjira was inspired by the exhibition to learn to paint his totemic landscape of the MacDonnell Ranges of Central Australia in the same modern landscape style. Namatjira’s paintings had a huge impact on the Western Arrernte, as well as on other Aboriginal artists and the wider Australian public. In depicting local ancestral sites in the pictorial language of Biblical illustrations, Namatjira’s paintings are a visual parallel to the Arrernte Bible, effectively translating their ancestral histories into a modern idiom. To this day, the Western Arrernte consider Namatjira’s style as their own, as if it embodies their collective identity and history of the place. His success is considered a milestone in Australian art and the beginning of the modern Aboriginal art movement.


1982 ◽  
Vol 3 ◽  
pp. 152-155 ◽  
Author(s):  
D. Jenssen ◽  
U. Radok

Total gas contents of ice cores together with temperature estimates derived from 180/160 and 2D/1H values have been used to separate topographic and climatic changes in the deposition temperature history of the ice (Raynaud 1977, Jenssen 1978). The most recent analysis (Jenssen in press) made use of two linear relationships (one purely empirical, the other established empirically but subsequently justified theoretically) to derive an algebraic expression for the change of surface temperature with ice-sheet elevation. A physical line of reasoning is presented which instead infers the climatic history from changes in the surface topography of the ice sheet. This suggests that a complete interpretation of core data must go hand in hand with ice-sheet modeling.


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