The effect of triacetin as a fuel additive to waste cooking biodiesel on engine performance and exhaust emissions

This study investigates the effect of oxygenated fuels on engine performance and exhaust emission under a custom cycle using a fully instrumented 6-cylinder turbocharged diesel engine with a common railinjection system. A range of oxygenated fuels based on waste cooking biodiesel with triacetin as an oxygenated additive were studied. The oxygen ratio was used instead of the equivalence ratio, or air to fuelratio, to better explain the phenomena observed during combustion. It was found that the increased oxygen ratio was associated with an increase in the friction mean effective pressure, brake specific fuel consumption, CO, HC and PN. On the other hand, mechanical efficiency, brake thermal efficiency, CO2, NOx and PM decreased with oxygen ratio. Increasing the oxygen content of the fuel was associated with a decrease in indicated power, brake power, indicated mean effective pressure, brake mean effective pressure, friction power, blow-by, CO2, CO (at higher loads), HC, PM and PN. On the other hand, the brakespecific fuel consumption, brake thermal efficiency and NOx increased by using the oxygenated fuels. Also, by increasing the oxygen content, the accumulation mode count median diameter moved toward the smaller particle sizes. In addition to the oxygen content of fuel, the other physical and chemical properties of the fuels were used to interpret the behavior of the engine.

Comparative acoustic performance and mechanical properties of silk membranes for the repair of chronic tympanic membrane perforations

The acoustic and mechanical properties of silk membranes of different thicknesses were tested to determine their suitability as a repair material for tympanic membrane perforations. Membranes of different thickness (10-100μm) were tested to determine their frequency response and their resistance to pressure loads in a simulated ear canal model. Their mechanical rigidity to pressure loads was confirmed by tensile testing. These membranes were tested alongside animal cartilage, currently the strongest available myringoplasty graft as well as paper, which is commonly used for simpler procedures. Silk membranes showed resonant frequencies within the human hearing range and a higher vibrational amplitude than cartilage, suggesting that silk may offer good acoustic energy transfer characteristics. Silk membranes were also highly resistant to simulated pressure changes in the middle ear, suggesting they can resist retraction, a common cause of graft failure resulting from chronic negative pressures in the middle ear. Part of this strength can be explained by the substantially higher modulus of silk films compared with cartilage. This allows for the production of films that are much thinner than cartilage, with superior acoustic properties, but that still provide the same level of mechanical support as thicker cartilage. Together, these in vitro results suggest that silk membranes may provide good hearing outcomes while offering similar levels of mechanical support to the reconstructed middle ear.

Mathematics teacher education and technology

Various applications of electronic technology have contributed to the field of mathematics teacher education, but the array of tools now' available to teacher educators in developed countries can be somewhat daunting. In this chapter, the authors present an overview of some of these tools and the ways that they are being used. In addition, they address issues surrounding the development and applications of digital technology in teacher education programs in a number of countries. In particular, they present recent applications of videotapes, multimedia resources, internet-based communities, and tutorial conferencing facilities in pre-service and in-service education of mathematics teachers. As professionals who have used technology in teacher education, the authors blend their own insights into this review of technological tools and relevant issues.

Performance and narrative, bodies and movement in the construction of places and objects, spaces and knowledges: The case of the Maltese megaliths

The article explores the ways knowledge and space are co-produced performatively through bodily movement in an examination of the Maltese megaliths the first complex stone structures in the world. It is argued that knowledge is best seen as spatialized narratives of human actions and objects as materialized forms of those spatial narratives. Rewriting our social and historical narratives so that the performativity of place, space and knowledge is restored opens new possibilities for rethinking the social and material order.

The relationship between TQM practices, quality performance, and innovation performance: An empirical examination

This empirical study examines the relationship between total quality management (TQM) and innovation performance and compares the nature of this relationship against quality performance. The empirical data were obtained from a survey of 194 managers in Australian industry encompassing both manufacturing and non-manufacturing sectors.

Planning, delivery and evaluation of information literacy training for engineering and technology students

Information literacy has become an important skill for undergraduate students due to societal changes that have seen information become a valuable commodity, the need for graduates to become lifelong learners, and the recognition that information literacy is an underpinning generic skill for effective learning in higher education. This paper describes a sequence of activities and technologies designed to help students learn and practice information literacy skills. These activities have been purposefully designed and integrated into a first-year engineering and technology study unit as a core syllabus element. A formal evaluation of aspects of these activities was planned and undertaken in semester one 2003.

The Relationship between TQM Practices and Quality Performance and the Role of Formal TQM Programs: An Australian Empirical Study

This article presents the findings from an empirical study examining the relationship between total quality management (TQM) practices and quality performance in Australian organizations. A comparison is made between organizations that have adopted formal TQM programs and organizations without a formal program in place. It was recognized that the lack of a formal program did not necessarily mean TQM principles were not being practiced. The findings show that the firms adopting formal TQM programs implement several TQM practices at a higher level than those that do not have TQM programs. This difference, however, is not apparent in the case of quality performance. Furthermore, the findings show the strong links between TQM practices and quality performance, and there is no significant difference between organizations implementing formal TQM programs and those organizations simply adopting TQM practices. This suggests that it is the adoption of quality practices that matters rather than formal programs per se.

Marketing research performance and strategy

Purpose - To investigate whether strategic orientation affects the evaluation of specific market research projects in for-profit firms.
Design/methodology/approach - A small-scale follow-up survey was conducted, building on qualitative and quantitative research among a sample of the top-1,000 marketing managers in Australia. The study used an existing market research evaluation tool, the USER scale and items generated from the qualitative research, to investigate the firm's most recent market research project.
Findings - Four market research performance factors were identified - market research as a knowledge enhancing (KE) function, the internal political use of market research, the misuse of market research and the generation of market understanding. The Miles and Snow strategy types were related to these factors, with Prospector types more likely to use market research rationally and less likely to use it for internal political purposes. Tactical projects were more likely to be misused than were those with a strategic orientation. Prospectors were far less likely and analysers far more likely to misuse tactical research projects. Prospectors were more often satisfied with the performance of their most recent market research. The Porter typology was less successful in predicting market research performance.
Research limitations/implications - The study was based on a small sample of market research projects in Australian for-profit firms. Future studies need to study these phenomena more intensively using ethnographic methods and more extensively using larger multi-country samples.
Practical implications - Market research suppliers should learn the nature of their client's strategic intent to improve their effectiveness. Defender firms should carefully monitor the use of market research, especially that of a tactical nature, which may be wasted or misused.
Originality/value - Contributes to an understanding of how strategic orientation relates to the ways market research information is used within the firm.

Reasons stated by commencing students for studying engineering and technology

Responses were collected from commencing engineering students and an inventory of reasons stated for electing to study engineering was developed. Commencing engineering students were strongly career oriented; they believed that engineering would be an interesting and rewarding career that would offer enjoyment and career options. No difference was found in the principal reasons stated by respondents based on gender or course of study. On-campus students nominated principally career-related reasons for their choice of study (71 percent). While career-related reasons were still important for off-campus students, the most frequent type of responses were related to career upgrading (43.9 percent).

Anthropometry, physical performance, and ultrasound patellar tendon abnormality in elite junior basketball players: a cross-sectional study

Objective: Patellar tendinopathy has been reported to be associated with many intrinsic risk factors. Few have been fully investigated. This cross-sectional study examined the anthropometric and physical performance results of elite junior basketball players with normal or abnormal patellar tendons to see if any measures were associated with changes in tendon morphology.

Methods: Agility, leg strength, endurance, and flexibility were measured in 71 male and 64 female players. A blinded radiologist ultrasonographically examined their patellar tendons and athletes were grouped as having normal or abnormal tendons. One-way ANOVA was used to test for differences in anthropometric and physical performance data for athletes whose tendons were normal or abnormal (unilateral or bilateral tendinopathy) on ultrasound.

Results: Results show that females with abnormalities in their tendons had a significantly better vertical jump (50.9±6.8 cm) than those with normal tendons (46.1±5.4 cm) (p = 0.02). This was not found in males. In males, the mean sit and reach in those with normal tendons (13.2±6.7 cm) was greater (p<0.03) than in unilateral tendinopathy (10.3±6.2 cm) or in bilateral tendinopathy (7.8±8.3 cm). In females, those with normal tendons (13.3±4.8 cm) and bilateral tendinopathy (15.8±6.2 cm) were distinctly different from those with unilateral tendinopathy (7.9±6.6 cm).

Conclusion: Flexibility and vertical jump ability are associated with patellar tendinopathy and the findings warrant consideration when managing young, jumping athletes.