Development of a new versatile computer controlled electrochemical/ESR data acquisition system

A new versatile computer controlled electrochemlcal/ESR data acquisition system has been developed for the Investigation of short-lived radicals with life-times of 20 milliseconds and greater, Different computer programs have been developed to monitor the decay of radicals; over hours or minutes, seconds or milliseconds. Signal averaging and Fourier smoothing is employed in order to improve the signal to noise ratio. Two microcomputers are used to control the system, one home-made computer containing the M6800 chip which controls the magnetic field, and an IBM PC XT which controls the electrochemistry and the data acquisition. The computer programs are written in Fortran and C, and call machine language subroutines, The system functions by having the radical generated by an electrochemical pulse: after or during the pulse the ESR data are collected. Decaying radicals which have half-lives of seconds or greater have their spectra collected in the magnetic field domain, which can be swept as fast as 200 Gauss per second. The decay of the radicals in the millisecond region is monitored by time-resolved ESR: a technique in which data is collected in both the time domain and in the magnetic field domain. Previously, time-resolved ESR has been used (without field modulation) to investigate ultra-short-lived species with life-times in the region of only a few microseconds. The application of the data acquisition system to chemical systems is illustrated. This is the first time a computer controlled system whereby the radical is generated by electrochemical means and subsequently the ESR data collected, has been developed.

From food to offspring down : tissue-specific discrimination and turn-over of stable isotopes in herbivorous waterbirds and other avian foraging guilds

Isotopic discrimination and turn-over are fundamental to the application of stable isotope ecology in animals. However, detailed information for specific tissues and species are widely lacking, notably for herbivorous species. We provide details on tissue-specific carbon and nitrogen discrimination and turn-over times from food to blood, feathers, claws, egg tissues and offspring down feathers in four species of herbivorous waterbirds. Source-to-tissue discrimination factors for carbon (δ¹³C) and nitrogen stable isotope ratios (δ¹⁵N) showed little variation across species but varied between tissues. Apparent discrimination factors ranged between −0.5 to 2.5‰ for δ¹³C and 2.8 to 5.2‰ for δ¹⁵N, and were more similar between blood components than between keratinous tissues or egg tissue. Comparing these results with published data from other species we found no effect of foraging guild on discrimination factors for carbon but a significant foraging-guild effect for nitrogen discrimination factors.

Turn-over of δ¹³C in tissues was most rapid in blood plasma, with a half-life of 4.3 d, whereas δ¹³C in blood cells had a half-life of approximately 32 d. Turn-over times for albumen and yolk in laying females were similar to those of blood plasma, at 3.2 and 6.0 d respectively. Within yolk, we found decreasing half-life times of δ¹³C from inner yolk (13.3 d) to outer yolk (3.1 d), related to the temporal pattern of tissue formation.

We found similarities in tissue-specific turn-over times across all avian species studied to date. Yet, while generalities regarding discrimination factors and tissue turn-over times can be made, a large amount of variation remains unexplained.

The life and times of an online discussion

Teaching online and facilitating effective discussion with students requires adapting existing patterns of traditional classroom discussion techniques. This paper examines the life and times of a number of online discussions in both graduate and undergraduate papers for eduction students at the University of Waikato. Key features examined include the creation of an effective online environment model, the level and type of participation, along with modes of effective discussion assessment. The impact and development of the conversational style software environment that includes pictures of the participants has proved to be a critical aspect of discussion development and innovation.

The life and times of Peter Snodgrass 1817-1867

Peter Snodgrass, an early pioneer and squatter in the Port Phillip District, died on 27 November 1867. A member of a gentrified military family, he reconstructed his life by overlanding from New south Wales to the Goulburn River District where he established a pastoral holding. Despite his early reputation as 'a wild young man' he became a member of Port Phillip District's first Legeslative Council, first Legislative Assembly and first Prahran Council, and was also a foundation member of a number of professional and sporting clubs in Melbourne. A somewhat enigmatic figure in his lifetime, Snodgrass is yet worthy of study for legacies that became an integral part of our cultural heritage.

Security in uncertain times: policies for increasing the popularity of life annuities among retirees

Life annuities offer retirees an assured income stream for as long as they live. This makes it surprising that they are unpopular in most markets where their purchase is not compelled by government policy. With the numbers of retirees in the population set to increase dramatically, this low take-up rate of life annuities could exacerbate financial insecurity. Consequently, it is in society’s interest to implement non-coercive policies that increase annuitization levels. Although there is research that has focused on the possible causes of low annuitization rates, much of this research falls short of suggesting comprehensive strategies for persuading retirees to annuitize their savings.

Leadership for socially just schooling: more substance and less style in high-risk, low-trust times?

This article argues that radical shifts in school governance arising from wider social, political, and economic relations toward what are described as high-risk and low-trust societies challenge past notions of leadership. I explore the tensions between the pluralism of postmodernist thinking and modernist notions of social justice that produce "predicaments" for school leaders through a series of paradoxes of educational management around centralized decentralization, markets and management, new educational professionalism, parental choice and community participation, and between the substance and style of leadership. The values underpinning the corporatization of public and private life most evident in education do not provide a satisfactory grounding for effective school leadership.

The management of subjective quality of life by short-stay hospital patients: an exploratory study

Background: This study tested the homeostatic model of subjective quality of life in a group of 47 short stay patients as they progressed through the stages of hospitalization for surgery.
Method: Participants completed a questionnaire measuring subjective quality of life, positive and negative affect, self-esteem, optimism and cognitive flexibility, the day prior to admission (T1), two days post-operation (T2) and one week after discharge (T3). Neuroticism and Extroversion were measured at Time 1.
Results: All variables remained stable across the three times, apart from positive affect, which dropped significantly post-operation but returned to its previous level post discharge.
Conclusion: Although the homeostatic model of subjective quality of life was supported at Time 1, the analyses raise doubts about the stability of personality. This finding is consistent with recent discussions of personality.

'Untranscended / life itself': the poetry of Pam Brown

Pam Brown's cynicism, satire, attractions and repulsions seem built around an absent centre, something always already in the poetry lost in the tedious non-occurrences of contemporary Australian life. Brown has typically published in a scattered, small-press way and while this small-press, small-readership approach is something most Australian poets know intimately, Brown has made it into an art form, and one which seems in keeping with her own ironic and at times cynical approach to the world of appearance, celebrity and media hype.

Health-related quality of life and metabolic control in children with type 1 diabetes : a prospective cohort study

OBJECTIVE—To assess change in health-related quality of life (HRQOL) in children with diabetes over 2 years and determine its relationship to change in metabolic control.

RESEARCH DESIGN AND METHODS—In 1998, parents of children aged 5–18 years attending a tertiary diabetes clinic reported their child’s HRQOL using the Child Health Questionnaire PF-50. Those aged 12–18 years also self-reported their HRQOL using the analogous Child Health Questionnaire CF-80. HbA_1c levels were recorded. In 2000, identical measures were collected for those who were aged ≤18 years and still attending the clinic.

RESULTS—Of 117 eligible subjects, 83 (71%) participated. Parents reported no significant difference in children’s HRQOL at baseline and follow-up. However, adolescents reported significant improvements on the Family Activities (P < 0.001), Bodily Pain (P = 0.04), and General Health Perceptions (P = 0.001) scales and worsening on the Behavior (P = 0.04) scale. HbA1c at baseline and follow-up were strongly correlated (r = 0.57). HbA_1c increased significantly (mean 7.8% in 1998 vs. 8.5% in 2000; P < 0.001), with lower baseline HbA_1c strongly predicting an increase in HbA_1c over the 2 years (r² = 0.25, P < 0.001). Lower parent-reported Physical Summary and adolescent-reported Physical Functioning scores at baseline also predicted increasing HbA_1c. Poorer parent-reported Psychosocial Summary scores were related to higher HbA_1c at both times but did not predict change in HbA_1c.

CONCLUSIONS—Changes in parent and adolescent reports of HRQOL differ. Better physical functioning may protect against deteriorating HbA_1c, at least in the medium term. While the HRQOL of children with diabetes does not appear to deteriorate over time, we should not be complacent, as it is consistently poorer than that of their healthy peers.

Young women with diabetes: using internet communication to create stability during life transitions

Aims and objectives. The aim of the current study was to explore and describe the strategies young women with Type 1 diabetes used to manage transitions in their lives. This paper will describe one aspect of the findings of how women with Type 1 diabetes used the Internet to interact with other people with diabetes and create stability in their lives.

Background. Individuals living with diabetes develop a range of different strategies to create stability in their lives and enhance their well-being. Changing social and emotional conditions during life transitions have a major impact on diabetes management. Although the literature indicates that strategies enabling the individuals to cope with transitions are important, they remain under-researched.

Design. Using grounded theory, interviews were conducted with 20 women with Type 1 diabetes. Constant comparative data analysis was used to analyse the data and develop an understanding of how young women with Type 1 diabetes used the Internet to create stability in their lives.

Findings. The findings revealed that the women valued their autonomy and being in control of when and to whom they reveal their diabetic status, especially during life transitions and at times of uncertainty. However, during these times they also required health and social information and interacting with other people. One of the women's main strategies in managing transitions was to use Internet chat lines as a way of obtaining information and communicating with others. This strategy gave women a sense of autonomy, enabled them to maintain their anonymity and interact with other people on their own terms.

Conclusions. Having meaningful personal interactions, social support and being able to connect with others were fundamental to the women's well being. Most importantly, preserving autonomy and anonymity during such interactions were integral to the way the women with Type 1 diabetes managed life transitions.

Relevance to clinical practice. Health professionals need to explore and incorporate Internet communication process or anonymous help lines into their practice as a way to assist people manage their diabetes.

The effect of laser power density on the fatigue life of laser-shock-peened 7050 aluminium alloy

Laser shock peening (LSP) is an innovative surface treatment method that can result in significant improvement in the fatigue life of many metallic components. The process produces very little or no surface profile modification while producing a considerably deeper compressive residual stress layer than traditional shot peening operations. The work discussed here was designed to: (a) quantify the fatigue life improvement achieved by LSP in a typical high strength aircraft aluminium alloy and (b) identify any technological risks associated with its use. It is shown that when LSP conditions are optimal for the material and specimen configuration, a —three to four times increase in fatigue life over the as-machined specimens could be achieved for a representative fighter aircraft loading spectrum when applied at a representative load level. However, if the process parameters are not optimal for the material investigated here, fatigue lives of LSP treated specimens may be reduced instead of increased due to the occurrence of internal cracking. This paper details the effect of laser power density on fatigue life of 7050-T7451 aluminium alloy by experimental and numerical analysis.

Structural adjustment and change in the Australian life insurance industry post demutualization

Deregulation of financial markets has been an important platform for government policy in recent times. It has been a catalyst in the expansion of financial sector. The experience of Australian life insurers during this period represents an interesting case study into the impact of regulatory transition. The lifting of restrictions changed the institutional environment within which life insurers operated. In doing so it precipitated changes in strategies and organizational structures of these financial intermediaries. An information cost framework is used to analyse the consequences of deregulation and its implications for the Australian life insurance industry in emerging global financial markets.

Physical environmental conditions, spawning and early-life stages of an estuarine fish : climate change implications for recruitment in intermittently open estuaries

Significant variation in the egg and larval survival and juvenile recruitment of estuarine fishes has been linked to fluctuating environmental conditions. This present study compared the distribution and abundance of black bream (Acanthopagrus butcheri) eggs and yolk-sac larvae between two microtidal estuaries of different flow regimes, where the riverine flow into the Glenelg estuary was around eight times the flow volume into the Hopkins estuary. Samples were collected monthly from September to November at sites along each estuary where vertical profiles of temperature, salinity and dissolved oxygen (DO) were measured, and vertically stratified sampling of black bream eggs and yolk-sac larvae was conducted using a Schindler sampler. Salt wedge formation was apparent in both estuaries, with significant de-oxygenation of deeper, saline waters. Eggs occurred in a wide range of DO levels but yolk-sac larvae were less common at the lowest levels. Most eggs and yolk-sac larvae were collected in salinities greater than 10. Results suggested that egg mortality was higher in the Hopkins than the Glenelg estuary, which may be associated with the hypoxic conditions characteristic of low-flow conditions. The results have significant implications in terms of climate change that is predicted to lead to warmer, drier conditions in south-eastern Australia, potentially increasing stratification and subsequent hypoxic zones.

Security and ethical issues in the virtual world of Second Life

In recent times, Virtual Worlds such as Second Life have generated substantial publicity due to the participation of Fortune 500 companies, and other public and private organisations. As practitioners continue to discuss how organisations could derive business value from Virtual Worlds, new security and ethical issues in Virtual Worlds have emerged to challenge Virtual World users and stakeholders. This paper discusses privacy, intellectual property and a host of other security and ethical issues in Virtual Worlds. It contributes to practice and research by (i) providing insight into emerging security and ethical issues in Virtual Worlds, (ii) analysing the implication of these issues, within and beyond Virtual Worlds, and (iii) raising awareness on security and ethics among Virtual World users and stakeholders.

Assessing advanced life support (ALS) competence: Victorian practices

Advanced life support (ALS) assessments are performed to assess nurses’ abilities to recognize cardiac arrest events, and appropriately manage patients according to resuscitation guidelines. Although there is evidence for conducting assessments after initial ALS education, there is little evidence to guide educators about ongoing assessments in terms of methods, format and frequency.

The aim of this study was to determine methods used by educators to assess ALS skills and knowledge for nurses in Victorian intensive care units. This descriptive study used telephone interviews to collect data. Data were analysed using content analysis. Twenty intensive care educators participated in this study. Thirteen educators (65%) were employed in public hospitals, and 7 educators (35%) worked in private hospitals across 12 Level 3 (60%) and 8 Level 2 (40%) intensive care units.

Results showed all educators used scenarios to assess ALS skills, with 12 educators (60%) including an additional theoretical test. There was variability in ALS assessment frequency, assessment timing in relation to initial/ongoing education, person performing the assessment, and the assessor/participant ratio. Nineteen educators (95%) reported ALS skill competency assessments occurred annually; 1 educator (5%) reported assessments occurred every 2 years. Assessments were conducted during a designated month (n = 10), numerous times throughout the year (n = 8), or on nurses’ employment anniversaries (n = 2). All educators reported many nurses avoided undertaking assessments.

Variability in ongoing ALS assessment methods was evident in Victorian intensive care units with some units applying evidence-based practices. Consideration should be given to the purposes and methods of conducting annual ALS assessments to ensure resources and strategies are directed appropriately. To encourage nurses to retain ALS skills and knowledge, regular practices are recommended as an alternative to assessments. However, further research is required to support this notion.