Extension ladders - synthesis and characterisation of new spacer-bridged tetraorganodistannoxanes

Preliminary results are described on the synthesis and characterization of novel spacer-bridged tetraorganodistannoxanes, {[[R(Cl)Sn]₂(CH₂)₂]O}₄ (n = 5 – 8, 10, 12; R = CH₂SiMe₃) containing particularly long organic spacers. In the solid state, these compounds reveal typical double-ladder structures with eight tin atoms per molecule, whereas in solution a partial and reversible rearrangement takes place to form tetraorganodistannoxanes, {[[R(Cl)Sn]₂(CH₂)_n]O}₂ (n = 5 – 8, 10, 12; R = CH₂SiMe₃), having four tin atoms per molecule.

Body image dissatisfaction among males across the lifespan- a review of past literature

Objective: Most past research has focused on body dissatisfaction among females. This paper provides a review and evaluation of studies that have examined body dissatisfaction among males. Body dissatisfaction in males has been associated with poor psychological adjustment, eating disorders, steroid use, exercise dependence, as well as other health behaviors. It is therefore important to understand the level of body dissatisfaction, as well as the factors that are related to this construct. Method: The review is divided into three sections: body dissatisfaction among children, adolescents and adults. Within each section, levels of body dissatisfaction are examined, as well as the research that relates to sociocultural influences on body dissatisfaction. Difficulties in drawing valid conclusions from the data due to methodological problems are highlighted. Results: From the current data, it would appear that there are strong similarities in the levels of body dissatisfaction of male and female children, with most children demonstrating high levels of body satisfaction. During adolescence, boys are about equally divided between wanting to lose weight and increasing weight, but there are few studies that have examined a desire for increased muscle size. In adulthood, men evidence a stronger desire to lose weight as they get older. Conclusion: Overall, past studies have primarily focused on questions that are relevant to females, and there is a need to conduct studies that evaluate areas of body dissatisfaction that have greater relevance for males. This will then allow a better understanding of the relationship between body dissatisfaction and psychological and behavioral problems experienced by males at all stages of the lifespan.

Combining extension matrix and integer programming for optimal concept learning

This paper proposes two integer programming models and their GA-based solutions for optimal concept learning. The models are built to obtain the optimal concept description in the form of propositional logic formulas from examples based on completeness, consistency and simplicity. The simplicity of the propositional rules is selected as the objective function of the integer programming models, and the completeness and consistency of the concept are used as the constraints. Considering the real-world problems that certain level of noise is contained in data set, the constraints in model 11 are slacked by adding slack-variables. To solve the integer programming models, genetic algorithm is employed to search the global solution space. We call our approach IP-AE. Its effectiveness is verified by comparing the experimental results with other well- known concept learning algorithms: AQ15 and C4.5.

Frequency distribution of TATA box and extension sequences on human promoters

TATA box is one of the most important transcription factor binding sites. But the exact sequences of TATA box are still not very clear yet. In this study, we conducted a dedicated analysis on the frequency distribution of TATA Box and its extension sequences on human promoters. Sixteen TATA elements derived from TATA Box motif, TATAWAWN, were classified into three distribution patterns: peak, bottom-peak and bottom. Fourteen TATA extension sequences (up to two base extensions) were predicted to be the new TATA Box elements because of their high motif factors, which indicate their statistical significance. Statistical analysis on the promoters of mouse, zebrafish and drosophila melanogaster verified seven of these elements. It was also observed that the distribution of TATA elements on the promoters of housekeeping genes are very similar with their distribution on the promoters of tissue specific genes in human.

Cause-related marketing : an extension of the congruity concept

This paper considers the concept of congruity or 'fit' in a cause-related marketing (CRM) context. At present, there is a gap in the literature that explores how nonprofit-forprofit pairings affect a consumer's response to and evaluation of CRM campaigns. This paper develops the concept of 'fit' with particular attention being paid to three dimensions, namely, cognitive, emotional and behavioural congruity and the role these concepts play in determining consumers’ perception of the 'relatedness' of products and causes.

Into the protecting arms: the League of Nations and the extension of international assistance to unprotected persons in the Middle East and Europe, 1926 - 1928

The refugee dilemma in Europe in the years between the two world wars had a number of aspects: humanitarian, political, and diplomatic. It raised questions of migration, questions of international law, and questions of the fate of hundreds of thousands of individuals. Refugees were visible from the very last days of the war and remained a matter of serious international concern even beyond the outbreak of war again in September 1939. The refugee dilemma in Europe was, firstly, a humanitarian crisis because the size of the refugee population was without precedent. It was also a political problem because national governments had to contend with questions about the refugees' legal status and their legitimacy under national and international law, as well as balance humanitarian concerns with national political interests. The humanitarian and political aspects together created a crisis for the international community newly united in the League of Nations. One of its first great acts-to take these refugees into its protective care-was not even prescribed for it in its Covenant. But the refugee crisis facing Europe was so great that member states were united in the belief that the League had been established precisely to undertake a task of this kind.

Range extension of the Millewa Skink Hemiergis millewae in the Murray-Sunset National Park, Victoria

This article reports a range extension for the critically endangered Millewa Skink Hemiergis millewae in Victoria. An individual H. millewae was found approximately 85 km east of its former known range in mature mallee vegetation, near the eastern edge of the Murray-Sunset National Park on 27 March 2007. Site characteristics are described, and a list of other reptile species found at the same site is provided. Further research into the habitat associations and distribution of H. millewae is recommended in order to guide the management of this species.

Developing effective learning programs : what extension can learn from the fields of adult education and learning communities

Learning is an investment in capacity building that has and will continue to reap rewards for primary producers and government in terms of increased sustainable production, profitability, exports, jobs and sustainable rural communities. Primary production operates in a context of continual change and requires up to date, complex and varied skills of primary producers and land managers.

A recent national research project funded by the Department of Agriculture, Forestry and Fisheries Australia confirmed that application of best practice from the theory of adult education in designing and developing learning programs in primary industry results in learning activities that provide information that is relevant to farmers’ needs, delivered in an entertaining way, and that draws on examples directly relevant to the participants. As a result, the training often exceeds the expectations of the participants.

The project produced a self-assessment checklist to identify ways of improving the development and delivery of training for extension practitioners and training providers. The key issues include continuous monitoring of client’s needs, and actively seeking opportunities to meet and work with industry organisations, other training providers and funding bodies.

There appear to be two drivers for the development of learning programs. One is problems or opportunities identified by people and organisations that could be termed ‘scanners’ and who tend not to be potential participants, the other is learning needs expressed by individuals or enterprises who want to participate in learning activities (participants). Scanners are typically industry organisations, government agencies and researchers, but may include providers and participants. Extension practitioners are well-placed to act as scanners.

It is very important that farmers and farmer organisations contribute to the development of new learning programs. Without industry input and support, extension practitioners and training providers cannot be expected to ensure they meet client needs. In other words, to develop effective learning programs, there must an industry learning community of producers, industry organisations, extension practitioners and training providers and other stakeholders such as supply chain enterprises, government and researchers.

Extension and the VET sector : time for closer alignment?

Extension (industry training) and VET (the formal vocational education and training system), each vital to Australia's education and training for agriculture, have developed as separate domains. Recent research suggests that the potential of closer alignment should be further explored. Extension provides usually non-certified courses to primary producers. The VET sector involves accredited training in a quality- assured national framework. Despite subsidy incentives for producers to access VET, they are increasingly interested in the short courses and flexible delivery offered by extension. This paper explores implications for improving outcomes from investment in training and for rural capacity building from a project in which a sample of management level extension courses across Australia was analysed for the extent of alignment with VET. 84 percent of these extension courses are mapped to training package competencies. The potential is there for VET to capture new enrolees for its diploma and advanced diploma courses. Closer alignment between sectors would facilitate this process.

Effects of strength, flexibility and moderate intensity cardiovascular exercise on measures of fitness in sedentary women

The maintenance of functional physical fitness across the lifespan depends upon the presence or absence of disease, injury, and the level of habitual physical activity. The prevalence of sedentariness rises with increasing age culminating in 31% of elderly women being classified as leading a sedentary lifestyle. Exercise prescription that involves easily accomplished physical activity may result in the maintenance of mobility into old age through a reduction in the risk of premature death and disablement from cardiovascular disease and a reduction in the risk of falls and injuries from falls. It may be that short bouts of physical activity are more appealing to the sedentary and to those in full time employment than longer bouts, and it may be that short bouts of exercise, performed three times per day, can improve physical fitness. The purpose of this study was therefore to examine the problem: Does exercise session duration, initial cardiovascular fitness, and age group effect changes in functional physical fitness in sedentary women training for strength, flexibility and aerobic fitness? Twenty-three, sedentary women aged between 19 and 54 years who were employed at a major metropolitan hospital undertook six weeks of moderate intensity physical activity in one of two training groups. Participants were randomly allocated to either short duration (3 x 10 minute), or long duration (30 minute), exercise groups. The 3 x 10 minute group (n=13), participated in three, 10 minute sessions per day separated by at least 2 hours, 3 days per week. The 30 minute group (n=10), participated in three 30 minute sessions per week. The total amount of work was similar, with an average of 129 and 148 kcal training day for the 3 x 10 minute and 30 minute groups, respectively. The training program incorporated three walking and stair climbing courses for aerobic conditioning, a series of eleven static stretches for joint flexibility, and isotonic and isometric strength exercises for lower and upper body muscular strength. Measures of functional strength, functional flexibility and cardiovascular fitness were assessed prior to training, and immediately following the six week exercise program. A two way analysis of variance (Group x Time) was used to examine the effect of training and group on the dependent variables. The level of significance, 0.05 was adopted for all statistical tests. Mean hand grip strength showed for both groups no significant change over time for the 3 x 10 minute group (30.7kg to 31.7kg) and 30 minute group (30.2kg to 32.4kg). Leg strength showed a trend for improvement (p=0.098) in both the 3 x 10 minute and 30 minute training groups representing a 15% and 18% improvement, respectively. Combined right and left neck rotation significantly improved in the 3 x 10 minute group (82.8° to 92.0°) and 30 minute group (82.5° to 91.5°). Wrist flexion and extension improved significantly in 3 out of the 4 measurements. Left wrist flexion improved significantly by an average of 7.0% for the 3 x 10 minute and 4.9% for the 30 minute group. Right and left wrist extension improved significantly in the 3 x 10 minute and 30 minute training groups (5.9% and 6.8%, respectively). Hip and spine flexibility improved 3.4cm (35.2cm to 38.6cm) in the 3 x 10 minute group, and 6.6cm (37.4cm to 44.0cm) in the 30 minute group. There was a significant improvement in cardiovascular fitness for both groups representing a 22% improvement in the 3 x 10 minute group (27.2 to 33.2 ml kg min), and a 25% improvement in the 30 minute group (27.5 to 34.4 ml -kg min). No significant difference was shown in the degree of improvement in cardiovascular fitness over six weeks of training for subjects of either low or moderate initial aerobic fitness. Grip strength showed no significant changes over time for either the young-aged (19-35 years) or middle-aged (36-54 years) groups. Leg strength showed a trend for improvement (p=0.093) in the young-aged group (63.5kg to 71.9kg) and middle-aged group (69.3kg to 85.8kg). Neck rotation flexibility improved a similar amount in both the young and middle aged groups representing an improvement of 9.9° and 8.0° respectively. There was significant improvement in two of the four measures of wrist flexibility. Hip and spine flexibility was significantly greater in the young-aged group compared to the middle-aged group (38.5cm and 30.7cm, respectively). There was a significant improvement in hip and spine flexibility over the six week training program representing an increase in reach of 6.5cm for the young age group and 4.9cm for the older group. The middle-aged subjects had significantly lower cardiovascular fitness than their younger peers, scoring 22.8 and 30.7 ml -kg min, respectively. Cardiovascular fitness improved a similar amount in both age groups representing a significant improvement of 23.8% and 28.1% for the younger-aged and middle-aged subjects, respectively. The findings of this study suggest that short bouts of exercise may be equally as effective as longer bouts of exercise for improving the flexibility and cardiovascular components of functional physical fitness in sedentary young and middle aged women. Additionally short bouts of exercise may be more attractive than longer bouts of exercise for the beginning exerciser as they may more easily fit into the busy lifestyle encountered by many people in today's society. Sedentary young and middle-aged women should benefit from static flexibility exercises designed to improve and/or maintain functional flexibility and thus maintain mobility and reduce the incidence of muscular injury. Regular, brisk walking, incorporating some stair climbing, is likely to be beneficial in improving cardiovascular health and perhaps also in improving leg strength, thereby helping to improve and maintain functional physical fitness for both young and middle-aged sedentary women.

Praxis modelling : an evaluation of and extension to feature based modelling

This thesis presents Relation Based Modelling as an extension to the Feature Based Modelling approach to student modelling. Relation Based Modelling dynamically creates new terms allowing the instructional designer to specify a set of primitives and operators from which the modelling system will create the necessary elements. Focal modelling is a new technique devised to manipulate and coordinate the addition of new terms. The thesis presents an evaluation of student modelling systems based on predictive accuracy.

Human mate selection across the lifespan

The lifespan mating preferences of men and women were examined to determine which of two theories of mate selection, evolutionary and social-role theory, could best explain the findings. Of the 785 respondents surveyed, the lifespan preferences of both men and women supported the evolutionary perspective of mate selection.

Case study demonstration of the family context of anxiety disorders across the lifespan and the effectiveness of cognitive-behavioural interventions

This portfolio aims to explore some of the issues related to the treatment of anxiety disorders in clinical practice by reviewing the literature on anxiety disorders across the lifespan and presenting four clinical case studies of individuals with different anxiety disorders.