Quantitative microbial risk assessment models for consumption of raw vegetables irrigated with reclaimed water

Quantitative microbial risk assessment models for estimating the annual risk of enteric virus infection associated with consuming raw vegetables that have been overhead irrigated with nondisinfected secondary treated reclaimed water were constructed. We ran models for several different scenarios of crop type, viral concentration in effluent, and time since last irrigation event. The mean annual risk of infection was always less for cucumber than for broccoli, cabbage, or lettuce. Across the various crops, effluent qualities, and viral decay rates considered, the annual risk of infection ranged from 10–3 to 10–1 when reclaimed-water irrigation ceased 1 day before harvest and from 10–9 to 10–3 when it ceased 2 weeks before harvest. Two previously published decay coefficients were used to describe the die-off of viruses in the environment. For all combinations of crop type and effluent quality, application of the more aggressive decay coefficient led to annual risks of infection that satisfied the commonly propounded benchmark of ≤10–4, i.e., one infection or less per 10,000 people per year, providing that 14 days had elapsed since irrigation with reclaimed water. Conversely, this benchmark was not attained for any combination of crop and water quality when this withholding period was 1 day. The lower decay rate conferred markedly less protection, with broccoli and cucumber being the only crops satisfying the 10–4 standard for all water qualities after a 14-day withholding period. Sensitivity analyses on the models revealed that in nearly all cases, variation in the amount of produce consumed had the most significant effect on the total uncertainty surrounding the estimate of annual infection risk. The models presented cover what would generally be considered to be worst-case scenarios: overhead irrigation and consumption of vegetables raw. Practices such as subsurface, furrow, or drip irrigation and postharvest washing/disinfection and food preparation could substantially lower risks and need to be considered in future models, particularly for developed nations where these extra risk reduction measures are more common.

Qualitative exploration of the nature of grief-related beliefs and expectations

Societal expectations of grief impact the experience of bereavement. The congruence of societal expectations with current scientific understanding of grief is unknown. Therefore two qualitative studies explored community perceptions of grief. In study one, three small focus groups (N = 9) examined grief-related expectations associated with hypothetical scenarios of bereavement. In study two, the impact of grief-related perceptions on the lived experience of bereavement for 11 individuals was explored through semi-structured interviews. Across both studies, elements of a traditional stage model view of grief were evident, with participants viewing emotional expression of grief as important. An avoidant coping style in the bereaved was considered problematic. Findings of study two suggested that grief-related beliefs may impact the bereavement experience via appraisal of the grief response and willingness to support bereaved individuals. The studies suggested that stage model assumptions in the beliefs of the general population persist, although there was a recognition of diversity in the grief response.

Balancing work and lifestyle : an exploratory study of chartered accountants in Australia

In today’s work environment, achieving a work-life balance is not only desirable, for employers it is a necessity to maintain a healthy workforce. Accounting careers are impacted by many factors, including technology and an increasing complexity in the demands for financial services, with resulting changes in where, when and how accountants perform their jobs. In addition, due to the general skills shortage faced by the businesses, the need for work-life balance has become a key determining factor for decisions regarding career choices.

The Institute of Chartered Accountants in Australia (The Institute) has embarked on a long term goal of developing a work environment which helps Chartered Accountants (CAs) to gain work-life balance to complement the demand of the workforce. Three studies have been completed. The first study was conducted in 1995 in which the career expectations and barriers for women Chartered Accountants were examined amongst CAs in Victoria. In 2001, a follow-up survey of both male and female CAs was conducted in Victoria and Tasmania. The present study reports on the latest part of the project – a national survey of all 6,600 CAs regarding their work-life balance and expectations. This paper discusses the trend established by the three studies, and identifies some interesting scenarios of the accounting careers for CAs in Australia.

Formulating an organizational knowledge strategy : the influence of existing IT infrastructure

This paper questions the influence of a pre-existing information technology (IT) infrastructure on the formulation of an organizational knowledge strategy. We draw on a classification of four different strategic views of IT infrastructure and explore how the historic investment in IT infrastructure enables and constrains the formulation of knowledge strategy in four case organizations. The four case organizations are representative of different scenarios of historic investments in IT infrastructure and knowledge strategy formulation. Our findings indicate that an IT infrastructure that is minimal or fragmented constrains the formulation of an explicit knowledge strategy. We further find that an extensive existing IT infrastructure enables the pursuit of an explicit knowledge strategy, but that even an elaborate IT infrastructure can introduce some constraints on IT facilitated knowledge processes in the organization.

Climate change sensitivity of comfort and energy performance criteria for offices

The climate change scenarios of the Intergovernmental Panel on Climate Change (IPCC) predict a significant increase in temperatures over the next decades. Architecture and building occupants have to respond to this change, but little information is currently available in how far the predicted changes are likely to affect comfort and energy performance in buildings. This study therefore investigates the climate change sensitivity of the following parameters: adaptive thermal comfort according to Ashrae Standard 55 and EN 15251, energy consumption, heating and cooling loads, and length of heating and cooling periods. The study is based on parametric simulations of typical office room configurations in the context of Athens, Greece. They refer to different building design priorities and account for different occupant behaviour by using an ideal and worst case scenario. To evaluate the impact of the climate change, simulations are compared based on a common standard weather data set for Athens, and a generated climate change data set for the IPCC A2 scenario. The results show a significant impact of the climate change on all investigated parameters. They also indicate that in this context the optimisation of comfort and energy performance is likely to be related to finding the best possible balance between building (design) and occupant behaviour and other contextual influences, rather than a straightforward optimisation of separated single parameters.

A review of mathematical equations to assign individual marks from a team mark

BACKGROUND : Team-based learning is an integral part of engineering education today. Development of team skills is now a part of the curriculum at universities as employers demand these skills on graduates. Higher education institutions enforce academic staff to teach, practise and assess team skills, and at the same time, they ask academic staff to supply individual marks and/or grades. Allocating individual marks from a team mark is a very complex and sensitive task that may adversely affect both individual and team performance. A number of both qualitative and quantitative methods are available to address this issue. Quantitative mathematical methods are favoured over qualitative subjective methods as they are more straightforward to explain to the students and they may help minimise conflicts between assessors and students. PURPOSE : This study presents a review of commonly used mathematical equations to allocate individual marks from a team mark. Quantitative analytical equations are favoured over qualitative subjective methods because they are more straightforward to explain to the students and if explained to the students in advance, they may help minimise conflicts between assessors and students. Some of these analytical equations focus primarily on the assessment of the quality of teamwork product (product assessment) while the others put greater emphasis on the assessment of teamwork performance (process assessment). The remaining equations try to strike a balance between product assessment and process assessment. The primary purpose of this study is to discuss the qualitative aspects of quantitative equations. DESIGN/METHOD : This study simulates a set of scenarios of team marks and individual contributions that collectively cover all possible teamwork assessment environments. The available analytical equations are then applied to each case to examine their relative merits with respect to a set of evaluation criteria with exhaustive graphical plots. RESULTS : Although each analytical equations discussed and analysed in this study has its own merits for a particular application scenario, the recent methods such as knee formula in SPARKPLUS and cap formula, are relatively better in terms of a number of evaluation criteria such as fairness, teamwork attitude, balance between process and product assessments etc. In addition to having all favourable properties of knee formula, cap formula explicitly considers the quality of teamwork (i.e., team mark) while allocating individual marks. Cap formula may, however, be difficult to explain to the students due to relatively complex mathematical equations involved. CONCLUSIONS : Not all existing analytical equations that allocate individual marks from a team mark have similar characteristics. Recent methods, knee formula and cap formula, are advantageous in terms of a number of evaluation criteria and are recommended to apply in practice. However, it is important to examine these equations with respect to enhancing students’ learning achievements rather than the students and academic staff’s preferences.

Long-term cost-effectiveness of weight management in primary care

Background:  As obesity prevalence and health-care costs increase, Health Care providers must prevent and manage obesity cost-effectively.

Methods:  Using the 2006 NICE obesity health economic model, a primary care weight management programme (Counterweight) was analysed, evaluating costs and outcomes associated with weight gain for three obesity-related conditions (type 2 diabetes, coronary heart disease, colon cancer). Sensitivity analyses examined different scenarios of weight loss and background (untreated) weight gain.

Results:  Mean weight changes in Counterweight attenders was −3 kg and −2.3 kg at 12 and 24 months, both 4 kg below the expected 1 kg/year background weight gain. Counterweight delivery cost was £59.83 per patient entered. Even assuming drop-outs/non-attenders at 12 months (55%) lost no weight and gained at the background rate, Counterweight was ‘dominant’ (cost-saving) under ‘base-case scenario’, where 12-month achieved weight loss was entirely regained over the next 2 years, returning to the expected background weight gain of 1 kg/year. Quality-adjusted Life-Year cost was £2017 where background weight gain was limited to 0.5 kg/year, and £2651 at 0.3 kg/year. Under a ‘best-case scenario’, where weights of 12-month-attenders were assumed thereafter to rise at the background rate, 4 kg below non-intervention trajectory (very close to the observed weight change), Counterweight remained ‘dominant’ with background weight gains 1 kg, 0.5 kg or 0.3 kg/year.

Conclusion:  Weight management for obesity in primary care is highly cost-effective even considering only three clinical consequences. Reduced healthcare resources use could offset the total cost of providing the Counterweight Programme, as well as bringing multiple health and Quality of Life benefits.

Minimum-order filter design for partial state estimation of linear systems with multiple time-varying state delays and unknown input delays

Designing delay-dependent functional observers for LTI systems with multiple known time-varying state delays and unknown time-varying input delays is studied. The input delays are arbitrary, but the state delays should be upper-bounded. In addition, two scenarios of slow-varying and fast-varying state delays are investigated. The results of the paper can also be considered as one of the first contributions considering unknown-input functional observer design for linear systems with multiple time-varying state delays. Based on the Lyapunov Krasovskii approach, delay-dependent sufficient conditions of the exponential stability of the observer in each scenario are established in terms of linear matrix inequalities. Because of using effective techniques, such as the descriptor transformation and an advanced weighted integral inequality, the proposed stability criteria can result in larger stability regions compared with the other papers that study functional observers for time-varying delay systems. Furthermore, to help with the design procedure, a genetic algorithm-based scheme is proposed to adjust a weighting matrix in the established linear matrix inequalities. Two numerical examples illustrate the design procedure and demonstrate the efficacy of the proposed observer in each scenario.

Aged care provision in Greater Bendigo : current provision and future requirements

In the following paper, ratios which correlate aged care places with physical infrastructure requirements are developed for the regional Victorian Local Government Area of Greater Bendigo, by analysing its existing aged care facilities. These ratios are then used in conjunction with the federal government’s population based measures to model scenarios of future aged care infrastructure requirements for Greater Bendigo. Strategies for the provision of additional residential aged care facilities are explored using a matrix governed by size and configuration. Variations in these two aspects are shown to affect the location options for future facilities in Greater Bendigo.

Aged care, Warrnambool and Bendigo, 2021 ,estimating land-use, connectivity

Ratios which correlate aged care places with Land-use requirements are developed by analysing the existing aged care facilities in the regional Victorian Local Government Areas of Greater Bendigo and Warrnambool. These ratios are used in conjunction with the government's population based measures to model scenarios of future aged care infrastructure requirements for Greater Bendigo and Warrnambool. Strategies correlating additional residential aged care facilities with at-home based aged care are explored using a Land-use and accessibility matrix governed by size and configuration. Variations in these two aspects appear to have a significant influence on location options for future facilities as well as case load demands and staffing requirements for community support teams.

Linking water-resource models to ecosystem-response models to guide water-resource planning -- an example from the Murray--Darling Basin, Australia

Objectively assessing ecological benefits of competing watering strategies is difficult. We present a framework of coupled models to compare scenarios, using the Coorong, the estuary for the MurrayDarling River system in South Australia, as a case study. The framework links outputs from recent modelling of the effects of climate change on water availability across the MurrayDarling Basin to a hydrodynamic model for the Coorong, and then an ecosystem-response model. The approach has significant advantages, including the following: (1) evaluating management actions is straightforward because of relatively tight coupling between impacts on hydrology and ecology; (2) scenarios of 111 years reveal the impacts of realistic climatic and flow variability on Coorong ecology; and (3) ecological impact is represented in the model by a series of ecosystem states, integrating across many organisms, not just iconic species. We applied the approach to four flow scenarios, comparing conditions without development, current water-use levels, and two predicted future climate scenarios. Simulation produced a range of hydrodynamic conditions and consequent distributions of ecosystem states, allowing managers to compare scenarios. This approach could be used with many climates and/or management actions for optimisation of flow delivery to environmental assets.

The perception of racism in ambiguous scenarios

Recent theorising on the nature of racism suggests that over the last few decades it has come to be expressed in more subtle and ambiguous ways because while many Whites proclaim egalitarian values, their cognitions and behaviour are influenced by prejudices that are buried deep in their psyche. This leads to the possibility that those who perpetrate and those who experience racism may have different interpretations of events that involve racism. Essed (1991) has suggested that because they are exposed to racism systematically, those who experience racism are in a good position to detect it if they have both knowledge of normal behaviour for particular situations, and a general knowledge of racism. Using Essed's model of the assessment of racist events, the descriptions of six videotaped ambiguously racist scenarios given by 40 Caucasian students and 40 Asian students were analysed to determine whether situational or general knowledge of racism was evident. Contrary to expectations, the Asian students, who belong to a group targeted with racism in Australia, were less likely to see racism in the scenarios. Finding the scenarios to be acceptable indicated a lack of situational knowledge and, hence, an inability to use general knowledge of racism if it exists. The role of cultural values in the application of situational knowledge is discussed, and further empirical investigations of Essed's model are proposed.

The robustness of the behavioural-intentions battery in services scenarios

The consensus among researchers is that loyalty is a very complex construct (Javalgi & Moberg 1997). Various typologies have been developed to measure the loyalty construct (e.g., Curassi and Kennedy 2002; Hoare 2000; Knox 1998; Zeithaml, Parasuraman & Berry 1996). Zeithaml, Berry & Parasuraman (1996) developed a service loyalty framework comprising 13 items across five dimensions: “loyalty”, “switch”, “pay more”, “external responses”, and “internal responses”. This framework was criticised by Bloemer, de Ruyter & Wetzels (1999) for having conceptual and empirical limitations. Upon re-examination of the same 13 items, they concluded that the loyalty construct comprised only four factors: “word-of-mouth”, “purchase intentions”, “price sensitivity”, and “complaining behaviour”. Questions remain as to the precise dimensionality of the service loyalty construct as proposed by Zeithaml, Parasuraman & Berry (1996), and its stability or robustness generically, i.e., to what extent is there an invariant factor structure across the range of marketing contexts to which the battery may be applied? This paper reports on the testing of the goodness-of-fit of the five and fourfactor models to data collected in a study of consumer reaction to the service supplied by an Australian Internet Service Provider (ISP), through a series of hypothetical scenarios. In addition, comparisons were conducted with the results of exploratory factor analyses of the eight scenarios. The results suggested that factor structures are unstable across the data subsets, thereby limiting the generalisability and utility of the proposed models.