A methodology for low-speed broadband rotational energy harvesting using piezoelectric transduction and frequency up-conversion

Energy harvesting from vibration for low-power electronics has been investigated intensively in recent years, but rotational energy harvesting is less investigated and still has some challenges. In this paper, a methodology for low-speed rotational energy harvesting using piezoelectric transduction and frequency up-conversion is analysed. The system consists of a piezoelectric cantilever beam with a tip magnet and a rotating magnet on a revolving host. The angular kinetic energy of the host is transferred to the vibration energy of the piezoelectric beam via magnetic coupling between the magnets. Frequency up-conversion is achieved by magnetic plucking, converting low frequency rotation into high frequency vibration of the piezoelectric beam. A distributed-parameter theoretical model is presented to analyse the electromechanical behaviour of the rotational energy harvester. Different configurations and design parameters were investigated to improve the output power of the device. Experimental studies were conducted to validate the theoretical estimation. The results illustrate that the proposed method is a feasible solution to collecting low-speed rotational energy from ambient hosts, such as vehicle tires, micro-turbines and wristwatches

Evaluating Success in Public Health Advocacy Strategies

Advocacy is conducted by public health organisations with the aim to bring about policy improvement for better health outcomes. Implementation of a new policy usually requires a change in government practice, often to be managed by relatively conservative, and resistant, government agencies. To better understand the change process, relevant frameworks for managing transition can be used, such as Kotter's The 8-step Process for Leading Change, as suggested by David Butt. This paper assesses the extent to which this framework can assist health advocates to determine the best approach and to evaluate the effectiveness of what they are doing as advocates. We evaluate the Public Health Association of Australia's (PHAA) advocacy campaign to incorporate environmental and equity considerations into the Australian Dietary Guidelines and the Australian Guide to Healthy Eating using Kotter's framework. The PHAA's advocacy actions clearly aligned with Kotter's 8 Steps management change process. Two additional steps were also identified - the need to build long-term relationships and the importance of opportunistic actions. Management frameworks can assist health advocates to determine the key elements of effective advocacy, to plan structured advocacy campaigns and to evaluate their effectiveness. Although the policy case example is an Australian one, the principles of effective advocacy are applicable internationally

Adoption of an infection prevention and control programme (IPCP) in the Republic of Kiribati: a case study in diffusion of innovations theory

Abstract presented at the International Conference on Prevention & Infection Control (ICPIC 2011) Geneva, Switzerland. 29 June - 2 July 201

A dynamic regulating mechanism for increased airflow speed range in micro piezoelectric turbines

© 2016 IEEE.The paper reports the design and fabrication of a micro-planar spring for a dynamic regulating mechanism to decrease the cut-in (start-up) airflow speed of a piezoelectric turbine. This mechanism is implemented by adjusting the magnetic coupling between the turbine rotor and a piezoelectric cantilever using the spring. Varied spring shapes and dimensions were analyzed with the finite element method (FEM) to optimize the structure. A micro spring with an ultra-low spring constant of 0.78 N/m was fabricated from titanium foil by laser machining. The spring was installed into a miniaturized air turbine to achieve the self-regulation. The cut-in speed was 2.34 m/s, showing a 30% improvement against a non-regulated turbine

Transduction Mechanisms and Power Density for MEMS Inertial Energy Scavengers

Accepted versio

Mems inertial power generators for biomedical applications

Accepted versio

'Caught Between a Rock and a Hard Place': Anti-discrimination Legislation in the Liberal State and the Fate of the Australian Disability Discrimination Act

This article offers a critical analysis of some of the practical implications for disabled people of the Disability Discrimination Act of 1992. Specifically, it raises questions about politics and the role of the law as an instrument of social change?taking greater account of the interests of disabled people?on the one hand, and of the reliance of the social model of disability on a strategy based upon legal rights on the other. The article also suggests that the constraining effects of Australia's constitutional protections of rights and its federal system of government hinder the mildly progressive elements of the Disability Discrimination Act. To illustrate this, the paper employs empirical evidence to suggest that these effects have been exacerbated by the passage of the Human Rights Legislation Amendment Act in 1999

Within the fold: assessing differential expression measures and reproducibility in microarray assays

BACKGROUND: 'Fold-change' cutoffs have been widely used in microarray assays to identify genes that are differentially expressed between query and reference samples. More accurate measures of differential expression and effective data-normalization strategies are required to identify high-confidence sets of genes with biologically meaningful changes in transcription. Further, the analysis of a large number of expression profiles is facilitated by a common reference sample, the construction of which must be carefully addressed. RESULTS: We carried out a series of 'self-self' hybridizations in which aliquots of the same RNA sample were labeled separately with Cy3 and Cy5 fluorescent dyes and co-hybridized to the same microarray. From this, we can analyze the intensity-dependent behavior of microarray data, define a statistically significant measure of differential expression that exploits the structure of the fluorescent signals, and measure the inherent reproducibility of the technique. We also devised a simple procedure for identifying and eliminating low-quality data for replicates within and between slides. We examine the properties required of a universal reference RNA sample and show how pooling a small number of samples with a diverse representation of expressed genes can outperform more complex mixtures as a reference sample. CONCLUSION: Analysis of cell-line samples can identify systematic structure in measured gene-expression levels. A general procedure for analyzing cDNA microarray data is proposed and validated. We show that pooled reference samples should be based not only on the expression of individual genes in each cell line but also on the expression levels of genes within cell lines

Advanced medical micro-robotics for early diagnosis and therapeutic interventions

Recent technological advances in micro-robotics have demonstrated their immense potential for biomedical applications. Emerging micro-robots have versatile sensing systems, flexible locomotion and dexterous manipulation capabilities that can significantly contribute to the healthcare system. Despite the appreciated and tangible benefits of medical micro-robotics, many challenges still remain. Here, we review the major challenges, current trends and significant achievements for developing versatile and intelligent micro-robotics with a focus on applications in early diagnosis and therapeutic interventions. We also consider some recent emerging micro-robotic technologies that employ synthetic biology to support a new generation of living micro-robots. We expect to inspire future development of micro-robots toward clinical translation by identifying the roadblocks that need to be overcome