Digital Commons Network^™

Effect Of Pre-Straining And Bake Hardening On The Microstructure And Mechanical Properties Of Cmnsi Trip Steels, L. C. Zhang, I. B. Timokhina, A. La Fontaine, S. P. Ringer, P. D. Hodgson, E V. Pereloma

Faculty of Engineering - Papers (Archive)

The effects of pre-straining and bake hardening on the mechanical behaviour and microstructural changes were studied in two CMnSi TRansformation-Induced Plasticity (TRIP) steels with different microstructures after intercritical annealing. The TRIP steels before and after pre-straining and bake hardening were characterised by X-ray diffraction, optical microscopy, transmission electron microscopy, three dimensional atom probe and tensile tests. Both steels exhibited discontinuous yielding behaviour and a significant strength increase with some reduction in ductility after pre-straining and bake hardening treatment. The following main microstructural changes are responsible for the observed mechanical behaviours: a decrease in the volume fraction of retained austenite, an …

The Effect Of A Calorie Controlled Diet Containing Walnuts On Substrate Oxidation During 8-Hours In A Room Calorimeter, Linda C. Tapsell, Marijka Batterham, Sze Yen Tan, Eva M. Warensjo

Faculty of Health and Behavioural Sciences - Papers (Archive)

Objective Dietary macronutrient proportions affect substrate utilization, but in practice people consume foods. We hypothesized that in overweight adults, a calorie controlled diet based on core foods and including walnuts may be advantageous in promoting greater use of fat stores. Methods This crossover study tested the effects of diet-related energy expenditure and fat oxidation in 16 overweight individuals over an 8-hour period. The 2 diets included breakfast and lunch meals during the measurement period and an evening meal the night before. They comprised core foods of bread/cereals, fruit, vegetables, milk/yogurt, and meat, and either walnuts (walnut diet) or olive oil …

Effect Of Zn Doping On Magnetic Order And Superconductivity In Lafeaso, Yuke Li, Xiao Lin, Qian Tao, Cao Wang, Tong Zhou, Linjun Li, Qingbo Wang, Mi He, Guanghan Cao, Zhu-An Xu

Faculty of Engineering - Papers (Archive)

We report Zn-doping effect in the parent and F-doped LaFeAsO oxy-arsenides. Slight Zn doping in LaFe1−xZnxAsO drastically suppresses the resistivity anomaly around 150K associated with the antiferromagnetic (AFM) spin density wave (SDW) in the parent compound. The measurements of magnetic susceptibility and thermopower confirm further the effect of Zn doping on AFM order. Meanwhile Zn doping does not affect or even enhances the Tc of LaFe1−xZnxAsO0.9F0.1, in contrast to the effect of Zn doping in high-Tc cuprates. We found that the solubility of Zn content (x) is limited to less than 0.1 in both systems and further Zn doping (i.e. …

Dem Simulation Of Effect Of Confining Pressure On Ballast Behaviour, P K. Thakur, Buddhima Indraratna, Jayan Sylaja J S Vinod

Faculty of Engineering - Papers (Archive)

In this paper, an attempt has been made to investigate the influence of confining pressure on deformation and degradation behaviourof railway ballast using the Discrete Element Method (DEM). A novel approach has been employed to model the two dimensionalprojection of field size ballast particles as cluster of bonded particles. Bonded particles are held together by a bond, and debonding isconsidered as particle breakage. A series of cyclic loading simulations using DEM were carried out on an assembly of angular ballast particles at different confining pressures (10 kPa to 240 kPa). The results highlight that the development of axial strain during …

Synthesis And Magnetorheological Effect Of Fe3o4-Tio2 Nanocomposite, Jianhong Wei, C J Leng, Xianzhou Zhang, Weihua Li, Z Y Liu, J Shi

Faculty of Engineering - Papers (Archive)

Aimed to obtain a material with improved rheological property, the Fe₃O₄-TiO₂ nanocomposites were prepared by a modified sol-gel processing. The structure and morphology of the Fe₃O₄-TiO₂ nanocomposites were examined by transmission electron microscopy (TEM), X-ray diffraction (XRD) analysis and Fourier transform infrared spectroscopy (FT-IR) analysis, etc. The magnetic property and the magnetorheological properties of the coated particles were also examined in detail. The experimental results demonstrated that such materials exhibited favorable magnetorheological (MR) effect, and the MR performance of them were dependent on the relative content of TiO₂ in …

The Effect Of Preparation Conditions And Biopolymer Dispersants On The Properties Of Swnt Buckypapers, Jenny Boge, Luke J. Sweetman, Marc In Het Panhuis, Stephen F. Ralph

Faculty of Science - Papers (Archive)

The effect of varying preparation conditions on the properties of buckypapers made using single-walled carbon nanotubes (SWNTs) was systematically investigated. Changing the sonication time, final dispersion volume or membrane filter used to prepare SWNT-Triton X-100 buckypapers all generally had only a small influence on the density, thickness, contact angle and electrical conductivity of the resulting material. More significant changes were noted when the effects of variations in the above preparation conditions on the mechanical properties and surface morphology of SWNT-Triton X-100 buckypapers were investigated. However, the largest changes in properties were found when various biopolymers (bovine serum albumin, lysozyme, gellan …

The Effect Of Bacteria On The Sensitivity Of Microalgae To Copper In Laboratory Bioassays, Jacqueline Levy, Jenny L. Stauber, Steven A. Wakelin, Dianne F. Jolley

Faculty of Science - Papers (Archive)

Although single-species laboratory toxicity tests with microalgae are sensitive and highly reproducible, they lack environmental realism. Interactions between algae and their associated bacteria, either in the plankton or in biofilms, may alter algal sensitivity to contaminants, which are not mimicked in laboratory toxicity tests. This study investigated the effects of simple algal-bacterial relationships on the sensitivity of laboratory-cultured algae to copper using 72-h algal growth-rate inhibition bioassays. Four species of microalgae were used, two isolates of each; a strain of algae with no microscopically visible and no culturable bacteria present (operationally defined as axenic) and a non-axenic strain. The four …

The Effect Of Vasoconstrictors On Oxygen Consumption In Resting And Contracting Skeletal Muscle Of The Autologous Pump-Perfused Rat Hindlimb, Andrew Hoy, Peter L. Mclennan, Gregory E. Peoples

Graduate School of Medicine - Papers (Archive)

No abstract provided.

Using Lidar To Assess The Effect Of Fire And Floods On Upland Peat Bogs, Waterfall Gully, Mount Lofty Ranges, South Australia, Javier Leon Patino, Solomon Buckman, Robert P. Bourman, Rowena Morris, Katherine C. Brownlie

Faculty of Science - Papers (Archive)

A flood exceeding the 100 year average recurrence interval in November 2005 led to the failure of an upland peat bog in Waterfall Gully. The area is prone to severe bushfire and flood events and the control dam at the base of First Falls was filled with sediment sourced from Wilson Bog. A resistant quartzite bar at Fourth Falls has formed a natural constriction point against which burnt logs and debris have collected following previous fire events forming a natural dam resulting in sediment/peat accumulation upstream. The failure of the bog was inevitable as the vegetative material in the log-jam …

Superconductivity In Lafeas1-Xpxo: Effect Of Chemical Pressures And Bond Covalency, Cao Wang, Shuai Jiang, Qian Tao, Zhi Ren, Yuke Li, Linjun Li, Chunmu Feng, Jianhui Dai, Guanghan Cao, Zhu-An Xu

Faculty of Engineering - Papers (Archive)

We report the realization of superconductivity by an isovalent doping with phosphorus in LaFeAsO. X-ray diffraction shows that, with the partial substitution of P for As, the Fe2As2 layers are squeezed while the La2O2 layers are stretched along the c-axis. Electrical resistance and magnetization measurements show emergence of bulk superconductivity at ∼ 10K for the optimally doped LaFeAs1−xPxO (x=0.25–0.3). The upper critical field at zero temperature is estimated to be 27T, much higher than that of the LaFePO superconductor. The occurrence of superconductivity is discussed in terms of chemical pressures and bond covalency

Magnetic Properties And Magnetocaloric Effect Of (Mn1-Xnix)3sn2(X=0-0.5) Compounds, Rong Zeng, Lin Lu, Jung Ho Kim, Dongqi Shi, Hua-Kun Liu, S. X. Dou, Jianli Wang, Stewart J. Campbell, Zhaoxiang Wang, Y Li, Wenxian Li, M Y. Zhu, Chuanqi Feng

Faculty of Engineering - Papers (Archive)

The effects of Ni substitution on the magnetic properties and magnetocaloric effect (MCE) of (Mn_1−xNi_x)₃Sn₂ compounds (x = 0–0.5) have been investigated by x-ray diffraction and magnetization measurements. It was found that Ni substitution decreases the crystal cell volume and the magnetic transition temperatures compared with pure Mn₃Sn₂. The MCE for all samples has been calculated from the magnetization data in terms of the isothermal magnetic entropy change ΔS_M. The maximum values of ΔSMmax at the magnetic phase transition temperatures resulting …

Re-Entrant Ferromagnet Prmn2ge0.8si1.2: Magnetocaloric Effect, S X. Dou, Jianli Wang, Rong Zeng, Chung-Kiak Poh, Stewart J. Campbell, S J. Kennedy

Faculty of Engineering - Papers (Archive)

The structural and magnetic properties of the re-entrant ferromagnet PrMn₂Ge_0.8Si_1.2 have been investigated by various experimental methods. Similar to the canonical re-entrant ferromagnet SmMn₂Ge₂, multiple magnetic phase transitions have been detected in PrMn₂Ge_0.8Si_1.2 over the temperature range from 10 to 550 K with re-entrant ferromagnetism occurring around ∼ 54 K. The magnetocaloric effect has been measured in terms of the isothermal magnetocaloric entropy change and found to be positive at the re-entrant ferromagnetic transition with a maximum value of around 1.9 J/kg K at 58 K …

Effect Of High Amylose Maize Starches On Colonic Fermentation And Apoptotic Response To Dna-Damage In The Colon Of Rats, Ian L. Brown, Richard K. Le Leu, Graeme P. Young, Ying Hu

Faculty of Health and Behavioural Sciences - Papers (Archive)

Background

We investigated in rats the effects of feeding different forms of high amylose maize starches (HAMS) rich in resistant starch (RS) to understand what the implications of RS heterogeneity might be for colonic biology, including innate cellular responses to DNA-damage.

Methods

A range of maize starches were compared: digestible cornstarch (Control), HYLON^® VII, Hi-maize^® 1043, Hi-maize^® 240, Hi-maize^® 260 and NOVELOSE^® 330. Included in the comparison was Cellulose. End-points after 4 weeks included: pH, short chain fatty acids (SCFA) levels, colonic epithelial cell kinetics and apoptotic response to carcinogen 'azoxymethane' in the colonic epithelium. …

Bauschinger Effect In Nb And V Alloyed Line-Pipe Steels, Andrii Kostryzhev, Martin Strangwood, Claire L. Davis

Faculty of Engineering and Information Sciences - Papers: Part A

The UOE process is used for cold forming of large diameter steel line-pipes. Pipe strength has been found to increase (work hardening) or decrease (Bauschinger effect) after the UOE process compared to the plate depending on the steel grade, plate and pipe processing history. The steel chemistry, through the presence of microalloy precipitates, and prior processing, through the size and distribution of microalloy precipitates and presence of retained work hardening, affects the magnitude of the Bauschinger effect. In this paper the microstructures of two (Nb and Nb-V alloyed) steel plates, in terms of (Nb,V)(C,N) particle distributions and dislocation densities, have …

Customer Orientation In An Australian Public Service Agency And Its Effect On Public Service Motives: Developing A Research Study, Christa Wood

Faculty of Commerce - Papers (Archive)

The Australian public service has experienced dramatic changes during the last few decades. One of the changes is the push for public servants to behave in accordance with private sector principles, such as customer service orientation. This paper is developing a research study that aims to analyse the motivational forces that enable (or disable) the behavioural changes of public servants and what impact (if any) those changes have on traditional public service motives. The study intends to use an extended expectancy-valence model together with a public service motive measurement scale to identify if there are relationships between motivational forces, customer …

Physically Attractive Presenters And Persuasion: An Experimental Investigation Of Alternative Explanations For The "Patzer Effect", Sandra Praxmarer, John R. Rossiter

Faculty of Commerce - Papers (Archive)

This experiment was designed to test alternative explanations for the powerful positive effect of the presenter’s facial attractiveness on persuasion found by Patzer (1985). The explanations tested are: (a) a “conscious Patzer effect” whereby the attractiveness of the presenter prompts conscious cognitive-response inferences about the presenter’s expertise and trustworthiness; (b) a “subconscious Patzer effect” whereby attractiveness persuades via beliefs about the presenter’s expertise and trustworthiness but without conscious cognitive responses; (c) an “affect transfer effect” whereby attractiveness increases liking of the presenter which in turn transfers to a more favorable attitude toward the brand; and (d) a “role-model identification effect” …