Stability of oxide films formed on mild steel in turbulent flow conditions of alkaline solutions at elevated temperatures

In the industries involving alkaline solutions in different process streams, the nature and stability of oxide films formed on the metallic surfaces determine the rates of erosion–corrosion of the equipment. In the present study the characteristics of the oxide films formed on AISI 1020 steel in a 2.75 M sodium hydroxide solution at temperatures up to 175°C, have been investigated by employing electrochemical techniques of cyclic voltammetry and chronoamperometry. The experiments were carried out in an autoclave system based upon a ‘rotating cylinder electrode’ geometry to determine the effects of turbulence on the stability of the films. The results suggest that little protection is afforded in the active region (at about −0.8 V_SHE). In the passive region at low potentials (−0.6 V to −0.4 V_SHE), it appears the films are compact and more stable, and therefore provide good protection. At higher potentials (>−0.4 V_SHE) in the passive region, the results suggest that film formation and dissolution occur simultaneously and the increase in temperature and turbulence causes a breakdown of the passive film resulting in a situation similar to nonprotective magnetite growth.

Investigation of processing conditions of melded parts to determine process boundaries

Melding, a novel method for producing seamless joints in thermosetting composites utilising the Quickstep™ process, is explored in this paper. The effect of processing conditions on the quality of melded joins is examined and a set of processing boundaries defined so that the strength of melded joints is optimized. HexPly® 914c pre-preg material was exposed to a range of processing temperatures prior to joining via the melding process. Differential Scanning Calorimetry analysis was carried out to investigate the degree of cure of material prior to final joining, and it was found that minimal cure occurs at temperatures below 120°C. After consolidation and cure of the melded parts, short beam shear testing was conducted to evaluate the strength of the melded interface. Exposure temperatures between 65°C and 120°C were found to optimize short beam shear join strength. Mode I double cantilever beam and mode II end notched flexural tests showed no detrimental effect of elevated exposure temperatures prior to joining.

The use of artificial biofilms to strip nutrients from an industrial smelters waste water under conditions of low temperature and high pH

The Victorian Environment Protection Authority (EPA) has identified Alcoa’s Point Henry aluminium smelter as being a major source of recognized pollutant input due to its disposal of effluent into Corio Bay. Historically, the water quality parameters that have most often exceeded Point Henry’s EPA limits have been pH and suspended solids from the smelter’s discharge points. These waste water discharges also experience high nitrogen and phosphorus concentrations which result in algal blooms that occur at the onset of warm weather. The main hypothesis of this study was that “prevention of algal blooming with the onset of warm weather by removal of nutrients during the cooler months, and continued removal thereafter, is better than curing the problems chemically”. Biofilms have been used to remove nutrients from waste waters, but not under the conditions experienced at Point Henry. The aim of this study, therefore, was to determine if significant biofilm growth would be observed on floating structures suspended in the Point Henry waste water stream during the cooler, winter months of the year. Statistically significant biofilm growth occurred on all suspended structures in all discharge ponds during the winter and early spring of 2000. The use of suspended structures, such as AquaMatTM, as an artificial substrate to attract and support periphyton and bacterial communities (biofilms), which are then able to out-compete phytoplankton communities for available nutrients, is therefore a viable option for the Point Henry smelter. However, further research on the competitive performance of biofilms in the Point Henry ponds during the summer months is required before adequate biofilm management strategies can be developed.

Perceived conditions of workers in different organizational settings

Purpose: – Research into office design and its effect on employee satisfaction and performance has attracted considerable contemporary research interest. However, most studies have tended to concentrate on the impact of the built environment on human performance, ignoring the actual needs of employees working in different organizational settings. This paper hence aims to investigate the nature and extent of occupant satisfaction with the built environment in different organizational settings in Australia for a range of climates.

Design/methodology/approach: – A survey was conducted in Australia from 2004-2005, comprising 41 buildings, including six government buildings, 14 educational buildings and 21 commercial buildings. The Kruskal-Wallis H test was used to explore whether there are differences in the mean ranking of office environment satisfaction amongst the three organizational settings, and the Mann-Whitney U test was employed to further test whether there are differences in the mean ranking of office environment satisfaction between any two groups.

Findings: – Significant differences were found in aspects of air, temperature, space suitability, flexibility, usability and controllability. Employees in commercial settings seem to be more satisfied with their physical work environment than employees in other organization types. Employees in educational settings showed the highest satisfaction with most variables in the workspace design and management category. Government employees showed a lower level of satisfaction with their physical work environment and workspace design and management.

Originality/value: – Moreover, the government and educational groups showed more similarity with each other, while the commercial group displayed significant difference.

Leading educational re-design to sustain socially just schools under conditions of instability

There is now significant evidence that school and leadership redesign is necessary in order to achieve more socially just educational futures for all students and a productive and professionally rewarding environment for teachers. Redesign requires some fundamental shifts in how schools work; engagement with and through learning communities based on systematic critical inquiry; and inclusive leadership practices that address the complexities of the relationships between diversity, culture, gender and race in schooling. I argue that democratic leadership is most conducive to initiating and sustaining equitable outcomes. The article concludes with consideration of principles that could sustain leadership for social justice.

The work conditions of allied health professionals : the impact on satisfaction, commitment and psychological distress

The present study investigated the extent to which the Demand-Control-Support (DCS) model, in combination with organizational justice variables, predicts the employee-level outcomes of allied health professionals'. Allied health professionals from an Australian healthcare organization were surveyed, with 113 participating (52,6%). Multiple regression analyses revealed that the DCS model predicted all the outcome variables of job satisfaction, organizational commitment and psychological distress. Conversely, significant contributions of the organizational justice variables were limited to organizational commitment and psychological distress. The results of the study provide practical implications for the job conditions of allied health professionals, in particular, the delivery of support and maintaining high levels of justice.

Officer wellbeing, satisfaction and commitment : job conditions of Australian law enforcement personnel

Excessive job stress caused by unreasonably high employer demands, low control over one's own work and limited support can have far-reaching effects for the individual, organisation and community. The present study sought to investigate the relationship between officer working conditions and their self-reported levels of wellbeing, satisfaction and commitment using a well-known job strss model, the demand-control-support (DCS) model. Using a large (N= 2085) sample of law enforcement personnel, findings indicated that social support from work sources was the best predictor, whilst job control and workload both had significant influences on levels of employee wellbeing, satisfaction and commitment. Additionally, non-linear relationships were found between workload and wellbeing and satisfaction, indicating that both high and low levels of workload can produce negative outcomes. The results have implications for job design and management training programs, particularly in reference to social support training and workload models.

The impact of the work conditions of allied health professionals on satisfaction, commitment and psychological distress

BACKGROUND: Allied health professionals are integral to the effective delivery of hospital-based health care, yet little is known about the working conditions associated with the attitudinal and health outcomes of these employees.

PURPOSE: The purpose of this study was to investigate the extent to which the demand-control-support model, in combination with organizational justice variables, predicts the employee-level outcomes of allied health professionals.

METHODOLOGY/APPROACH: Allied health professionals from an Australian health care organization were surveyed, with 113 (52.6%) participating. The survey included measures of job demands, job control, social support, organizational justice, satisfaction, commitment and psychological distress.

FINDINGS: Multiple regression analyses reveal that the additive demand-control-support model predicts the outcome variables of job satisfaction, organizational commitment and psychological distress, whereas the organizational justice variables predicted organizational commitment and psychological distress. Further, both work and nonwork sources of support, in addition to specific justice dimensions, were closely associated with employee-level outcomes.

PRACTICAL IMPLICATIONS: When coupled with previous research involving social support and organizational justice, the findings from this study suggest that initiatives aimed at strengthening supervisor and nonwork support, while enhancing perceptions of organizational fairness, may offer useful avenues for increasing the levels of satisfaction, commitment and well-being experienced by allied health professionals.

Constructing the conditions of and environments for interdisciplinary research on perception and action

This paper suggests ways in which art processes may contribute to the interdisciplinary study of perception and action and the relationships between body, person, and environment. Artists-turned-architects Arakawa and Gins serve as the most advanced example of an interdisciplinary research project in terms of coordinating material processes with contemporary findings, methods, and orientations from across the arts, humanities, and hard and soft sciences. In the first section of the paper, I discuss Arakawa and Gins's Reversible Destiny Lofts at Mitaka as an example of their procedural approach to long-term sustainable experimental environments. In the second section, the tactics through which Arakawa and Gins have repositioned art for the nonart purposes and common research goals are posited. Finally, I briefly outline the disciplinary positions and research values needed in order to move toward a more inclusive and interdisciplinary research practice.

Understanding the conditions of trust in the ALT and AMT relationships in project alliancing

This research also aims to develop a robust trust framework which can improve the understanding of the theory to support trust in alliancing, in particular the ALT and AMT relationship to improve project success factors. Research in trust within the construction industry has not yet examined how the relational signals within the five situations in the normative framework identified by Siegwart Lindenberg affect the level of trustworthiness between partners. More research is necessary to explore potential frameworks that can be used as the basis for future research in trust. Data from previous research in the performance of alliance has been used to verify the proposed framework. The framework will be developed in the ALT and AMT relationship to improve project success factors within the alliance. The originality of this research is trying to understand trust in the context of project alliancing in Australia as there are an increasing number of construction projects using the alliancing procurement method. Additionally, this research is examining the conditions of trust from the ALT and AMT teams specifically formed for the collaboration of project alliancing.