Optimal design of wind turbine blades equipped with flaps

As a result of the significant growth of wind turbines in size, blade load control has become the main challenge for large wind turbines. Many advanced techniques have been investigated aiming at developing control devices to ease blade loading. Amongst them, trailing edge flaps have been proven as effective devices for load alleviation. The present study aims at investigating the potential benefits of flaps in enhancing the energy capture capabilities rather than blade load alleviation. A software tool is especially developed for the aerodynamic simulation of wind turbines utilising blades equipped with flaps. As part of the aerodynamic simulation of these wind turbines, the control system must be also simulated. The simulation of the control system is carried out via solving an optimisation problem which gives the best value for the controlling parameter at each wind turbine run condition. Developing a genetic algorithm optimisation tool which is especially designed for wind turbine blades and integrating it with the aerodynamic performance evaluator, a design optimisation tool for blades equipped with flaps is constructed. The design optimisation tool is employed to carry out design case studies. The results of design case studies on wind turbine AWT-27 (Aerodynamic Wind Turbine-27) reveal that, as expected, the location of flap is a key parameter influencing the amount of improvement in the power extraction. The best location for placing a flap is at about 70% of the blade span from the root of the blade. The size of the flap has also significant effect on the amount of enhancement in the average power. This effect, however, reduces dramatically as the size increases. For constant speed rotors, adding flaps without re-designing the topology of the blade can improve the power extraction capability as high as of about 5%. However, with re-designing the blade pretwist the overall improvement can be reached as high as 12%

What works for offenders and staff: Comparing two multi-agency approaches to offender resettlement

Between 2005 and 2007, the Kent and Medway Resettlement Programme (KMRP) piloted EXODUS (ex-offenders discharged under supervision), a multi-agency support system for identified prolific and priority offenders (IPPOs). Unlike traditional models of multi-agency support, EXODUS agencies work from the same location to maximize support for IPPOs, and inter- and intra-agency support for staff. This study assessed the perceived effectiveness of EXODUS. EXODUS staff and IPPOs were interviewed and their responses compared to those of traditional multi-agency support staff and IPPOs. Analysis showed that EXODUS IPPOs had committed fewer offences since receiving support than did comparison IPPOs. Neither group was more likely to be employed, but of those who were, EXODUS IPPOs were more likely to remain employed than comparison IPPOs. Most, regardless of type of support structure, recommended their programme and staff, although EXODUS IPPOs were more satisfied with the support they received. Staff believed that an expansion of the multi-agency approach was needed and that agency roles should be more clearly defined. EXODUS staff expressed higher efficacy in their own and colleagues’ ability to provide effective support and improved inter-agency relations and support from co-workers. However, EXODUS and comparison staff did not differ in levels of job satisfaction

Engaging Wisdom: A Comparison of Cognitive and Interpersonal Interventions on Elderly Mental Health

In the United States the population of individuals over the age of 60 is large and expected to increase (Administration on Aging, 2009). Mental disorders (e.g., dementia) are especially prevalent in elderly populations (WHO, 2012). Considering the relatively small amount of research examining elderly populations in the United States, this prevalence highlights the potential and necessity for intervention research specifically designed for elderly individuals. This study examines the effectiveness of a cognitive as well as an interpersonal intervention on the mental health of a sample of individuals over the age of 60 at residential eldercare facilities. Results showed no significant differences between intervention groups. Data does highlight a promising future for cognitive and interpersonal interventions for elderly samples

Unscripted Book Review

In this paper I discuss the book Unscripted: The Unpredictable Moments that make life extraordinary . This involves things such as the contents of the book, my takeaways from the book and the thinking that I went through while reading it. A slide deck is also included from the class presentation of the material

Photodynamic Therapy Effects in the Treatment of Residual Periodontal Pockets

This systematic review examined the adjunctive effect of photodynamic therapy to treat residual pockets