Free-Flight Evaluation of Forebody Blowing for Yaw Control at High Angels of Attack

Forebody blowing is a concept developed to provide yaw control for aircraft flying at high angles of attack where a conventional rudder becomes ineffective. The basic concept is fairly simple. A small jet of air is forced out of the nose of the aircraft. This jet causes a repositioning of the forebody vortices in an asymmetrical fashion. The asymmetric forebody vortex flows develop a side force on the forebody which results in substantial yawing moments at high angles of attack. The purpose of this project was to demonstrate the use of forebody blowing as a control device through free-flight evaluation. This unique type of testing was performed at the NASA-Langley 30- by 60-foot tunnel. From these tests, it could then be shown that forebody blowing is an effective method of maintaining yaw control at high angles of attack

Exploring the tension between adherence and cultural fit when delivering Multsystemic Therapy in England

Multisystemic Therapy (MST) provides intensive short-term interventions for young people with antisocial behaviour and the systems that surround them. A wealth of research over the past 30 years has demonstrated the efficacy of MST. Its success has led to it being transported to many countries and this prompted investigations into the need for cultural adaptation. Despite these investigations highlighting the importance of tailoring MST to new countries, when MST was transported to England in 2001, it did not undergo a formal process of cultural tailoring. This study employed a qualitative approach using a Grounded Theory methodology to explore the assumption that all transported programmes require a level of adaptation and aimed to identify the processes and rationale behind informal ‘cultural tailoring’ undertaken by therapists. It aimed to explore areas in MST that might benefit from ‘cultural tailoring’ to improve the effectiveness of its implementation in England. Eight MST therapists from across three MST teams in England participated in semi-structured interviews. Analysis of the data generated a theoretical model of adherence: the Post Implementation Model of Adherence (PIMA). The PIMA model seeks to explain how therapists in England experience and manage adhering to MST. It proposes that MST therapists strive to adhere to all aspects of the MST model whilst ensuring that it is acceptable and workable for the families and systems they work with. The PIMA model comprised four theoretical codes: Facilitators to therapists staying faithful to the MST model; barriers to therapists implementing MST, overcoming barriers to implementing MST; and the therapist holding the tension. The findings highlight important cultural adjustments to improve MST’s ‘fit’ in England. Findings also extend Schoenwald’s (2008) recommendations for successful transportation of MST, by drawing attention to how a lack of cultural tailoring can be overcome or experienced as stressful by therapists

Social dance and wellbeing – an ethnographic study of two folk social dance settings

Sociable folk dancing in the UK is an organised group activity in which a significant number of people take part, often practising folk styles which have their origins in other countries. These groups are generally not run for profit, operate under the radar of media attention, and consequentially their activities remain largely hidden from view. This thesis addresses the fact that there have been no in-depth studies of these groups. It reports on the findings of a detailed ethnographic research project, to offer in-sights into the practices and motivations of participants in social dance. The thesis answers the key question: ‘What is the meaning and significance of participation in these folk music and social dance styles to those taking part?’. An interdisciplinary and ethnographic research approach was adopted to investigate two such folk styles: Cajun and Zydeco, and Scandinavian. This approach allowed research participants to make a significant contribution to the focus of the research, and to inform the subsidiary questions: ‘What are the concerns and interests of those involved in social folk dance?’, ‘What is it that makes involvement in these dance practices so appealing?’, and ‘What are the overall benefits of being involved?’ The research produced an interpretive account of these practices, through investigating sites of participation in these dance styles in the UK, which were explored by means of immersive involvement in their dance practices. This gave an insight into the way in which participation was organised and managed, and allowed for introductions to be made which were followed up with thirty in-depth interviews. The study revealed that despite the stylistic differences between the two dance styles and how they are practised, both nevertheless benefitted participants in similar ways. That dance events are organised on a not-for-profit basis was particularly important to participants, and encouraged loyalty and cooperation, promoting feelings of empowerment and ownership. An atmosphere of supportive inclusion was also built in to the loose organisation of events and activities, which allowed a consensus to develop where social attitudes and ideas could be negotiated, cultivated, and shared. This created a sense of belonging to an unboundaried, and fluid community or social network, a safe environment in which participants were able to experience dance as a communicative and expressive dialogue between individuals and within the group. This thesis argues that participants found their involvement in these dance styles socially and personally satisfying, and that this made a considerable contribution to their individual wellbeing. The research found that sociable folk dancing served as a vehicle for community, improving participants’ sense of self-worth, supporting creativity, and well-being. These findings complement clinical research that champions dance, and social dance in particular, as a healthy and worthwhile leisure activity. This thesis supports the results of such scientific studies into the benefits of dance by providing supporting evidence from within a social setting. This has implications for further research, and for policy and practice, whether dance activities are pursued formally or informally and whatever their aim

Free-flight investigation of forebody blowing for stability and control

A free-flight wind-tunnel investigation was conducted on a generic fighter model with forebody pneumatic vortex control for high angle-of-attack directional control. This is believed to be the first flight demonstration of a forebody blowing concept integrated into a closed-loop flight control system for stability augmentation and control. The investigation showed that the static wind tunnel estimates of the yaw control available generally agreed with flight results. The control scheme for the blowing nozzles consisted of an on/off control with a deadband. Controlled flight was obtained for the model using forebody blowing for directional control to beyond 45 deg. angle of attack

Fiber Optic Strain Sensor for Planetary Gear Diagnostics

This paper presents a new sensing approach for helicopter damage detection in the planetary stage of a helicopter transmission based on a fiber optic strain sensor array. Complete helicopter transmission damage detection has proven itself a difficult task due to the complex geometry of the planetary reduction stage. The crowded and complex nature of the gearbox interior does not allow for attachment of sensors within the rotating frame. Hence, traditional vibration-based diagnostics are instead based on measurements from externally mounted sensors, typically accelerometers, fixed to the gearbox exterior. However, this type of sensor is susceptible to a number of external disturbances that can corrupt the data, leading to false positives or missed detection of potentially catastrophic faults. Fiber optic strain sensors represent an appealing alternative to the accelerometer. Their small size and multiplexibility allows for potentially greater sensing resolution and accuracy, as well as redundancy, when employed as an array of sensors. The work presented in this paper is focused on the detection of gear damage in the planetary stage of a helicopter transmission using a fiber optic strain sensor band. The sensor band includes an array of 13 strain sensors, and is mounted on the ring gear of a Bell Helicopter OH-58C transmission. Data collected from the sensor array is compared to accelerometer data, and the damage detection results are presente

Cardiac Repair and Regeneration: The Value of Cell Therapies

Ischaemic heart disease is the predominant contributor to cardiovascular morbidity and mortality; one million myocardial infarctions occur per year in the USA, while more than five million patients suffer from chronic heart failure. Recently, heart failure has been singled out as an epidemic and is a staggering clinical and public health problem associated with significant mortality, morbidity and healthcare expenditures, particularly among those aged ≥65 years. Death rates have improved dramatically over the last four decades, but new approaches are nevertheless urgently needed for those patients who go on to develop ventricular dysfunction and chronic heart failure. Over the past decade, stem cell transplantation has emerged as a promising therapeutic strategy for acute or chronic ischaemic cardiomyopathy. Multiple candidate cell types have been used in preclinical animal models and in humans to repair or regenerate the injured heart, either directly or indirectly (through paracrine effects), including: embryonic stem cells (ESCs), induced pluripotent stem cells (iPSCs), neonatal cardiomyocytes, skeletal myoblasts (SKMs), endothelial progenitor cells, bone marrow mononuclear cells (BMMNCs), mesenchymal stem cells (MSCs) and, most recently, cardiac stem cells (CSCs). Although no consensus has emerged yet, the ideal cell type for the treatment of heart disease should: (a) improve heart function; (b) create healthy and functional cardiac muscle and vasculature, integrated into the host tissue; (c) be amenable to delivery by minimally invasive clinical methods; (d) be available ‘off the shelf’ as a standardised reagent; (e) be tolerated by the immune system; (f) be safe oncologically, i.e. not create tumours; and (g) circumvent societal ethical concerns. At present, it is not clear whether such a ‘perfect’ stem cell exists; what is apparent, however, is that some cell types are more promising than others. In this brief review, we provide ongoing data on agreement and controversy arising from clinical trials and touch upon the future directions of cell therapy for heart disease

The impact of female obesity on the outcome of fertility treatment

Peer reviewedPublisher PD