Prediction of landing gear loads using machine learning techniques

This article investigates the feasibility of using machine learning algorithms to predict the loads experienced by a landing gear during landing. For this purpose, the results on drop test data and flight test data will be examined. This article will focus on the use of Gaussian process regression for the prediction of loads on the components of a landing gear. For the learning task, comprehensive measurement data from drop tests are available. These include measurements of strains at key locations, such as on the side-stay and torque link, as well as acceleration measurements of the drop carriage and the gear itself, measurements of shock absorber travel, tyre closure, shock absorber pressure and wheel speed. Ground-to-tyre loads are also available through measurements made with a drop test ground reaction platform. The aim is to train the Gaussian process to predict load at a particular location from other available measurements, such as accelerations, or measurements of the shock absorber. If models can be successfully trained, then future load patterns may be predicted using only these measurements. The ultimate aim is to produce an accurate model that can predict the load at a number of locations across the landing gear using measurements that are readily available or may be measured more easily than directly measuring strain on the gear itself (for example, these may be measurements already available on the aircraft, or from a small number of sensors attached to the gear). The drop test data models provide a positive feasibility test which is the basis for moving on to the critical task of prediction on flight test data. For this, a wide range of available flight test measurements are considered for potential model inputs (excluding strain measurements themselves), before attempting to refine the model or use a smaller number of measurements for the prediction

Southern Cross Soloists Season 2016

Ensemble in Residence at the Queensland Performing Arts Centre, Southern Cross Soloists present three concerts: Forbidden Love (with Jack Liebeck, Violin)– 20th March 2016 at 3pm Visions of Earth (with William Barton, Didjeridu)– 19th June 2016 at 3pm Heavenly Voice (with Sara Macliver, Soprano)– 27th November 2016 at 3p

Contemporary South African Urbanization Dynamics

Abstract The paper provides an overview of urbanization patterns and trends in the current era in South Africa, focusing in particular on the key dynamics and driving forces underlying migration and urbanization. It considers overall demographic trends with regard to migration and urbanization, and points to some of the difficulties with data, and with the analysis of trends and patterns. The paper explores the changing rural context and dynamics, and some of the significant processes in this context: large-scale displacement of black people off farms, the impact of land reform, and conditions in the former homeland areas. Circular migration continues to be an important way in which households in rural areas survive, but some are unable to move, and are falling out of these networks. International migration—the consequence of both conditions in the home country and the draw of the South African economy— is another significant process fuelling mainly urban growth. The paper demonstrates the importance of cities in terms of economic growth and employment, and thus their attractiveness to migrants. Continuing migration to cities is of course a challenge fo

2013 Proceedings: The Next Generation

Will it be Adventist?https://knowledge.e.southern.edu/reysymp/1001/thumbnail.jp

Bella España

The Resonate concert series for 2015 brings art and music together in a highly original program featuring some of Australia’s best-loved performers. An internationally successful ensemble based at the Queensland Performing Arts Centre in Brisbane, the Southern Cross Soloists have helped set the benchmark for Australian chamber music since 1995. The Soloists have earned a well-deserved reputation for artistic excellence and continue to surprise and delight audiences with their constantly evolving repertoire and ever-changing annual programs. Their informal, up-close-and-personal performance style creates an intimate, inviting and deeply engaging experience. Acclaimed guitarist Slava Grigoryan joins the Southern Cross Soloists to present Bella España, a fiery program of Latin-influenced works celebrating dance and romance. Grigoryan, already a favourite with Gallery audiences, is one of Australia’s most renowned classical guitarists and a former Young Australian of the Year for the arts. In this program, works by Granados, De Falla and De Milan are paired with the flaming sounds of Villa-Lobos and Piazzolla, showcasing the beauty and intimacy of chamber music and the brilliance of the Spanish guitar

Women, weather, and woes: The triangular dynamics of female-headed households, economic vulnerability, and climate variability in South Africa

Existing gender inequality is believed to be heightened as a result of weather events and climate-related disasters that are likely to become more common in the future. We show that an already marginalized group—female-headed households in South Africa—is differentially affected by relatively modest levels of variation in rainfall, which households experience on a year-to-year basis. Data from three waves of the National Income Dynamics Survey in South Africa allow us to follow incomes of 4,162 households from 2006 to 2012. By observing how household income is affected by variation in rainfall relative to what is normally experienced during the rainy season in each district, our study employs a series of naturally occurring experiments that allow us to identify causal effects. We find that households where a single head can be identified based on residency or work status are more vulnerable to climate variability than households headed by two adults. Single male-headed households are more vulnerable because of lower initial earnings and, to a lesser extent, other household characteristics that contribute to economic disadvantages. However, this can only explain some of the differential vulnerability of female-headed households. This suggests that there are traits specific to female-headed households, such as limited access to protective social networks or other coping strategies, which makes this an important dimension of marginalization to consider for further research and policy in South Africa and other national contexts. Households headed by widows, never-married women, and women with a non-resident spouse (e.g., “left-behind” migrant households) are particularly vulnerable. We find vulnerable households only in districts where rainfall has a large effect on agricultural yields, and female-headed households remain vulnerable when accounting for dynamic impacts of rainfall on income

Writing in Britain and Ireland, c. 400 to c. 800

No abstract available

Reliability of Muscle Blood Flow and Oxygen Consumption Response from Exercise Using Near-infrared Spectroscopy

New Findings What is the central question of this study? Continuous-wave near-infrared spectroscopy, coupled with venous and arterial occlusions, offers an economical, non-invasive alternative to measuring skeletal muscle blood flow and oxygen consumption, but its reliability during exercise has not been established. What is the main finding and its importance? Continuous-wave near-infrared spectroscopy devices can reliably assess local skeletal muscle blood flow and oxygen consumption from the vastus lateralis in healthy, physically active adults. The patterns of response exhibited during exercise of varying intensity agree with other published results using similar methodologies, meriting potential applications in clinical diagnosis and therapeutic assessment. Near-infrared spectroscopy (NIRS), coupled with rapid venous and arterial occlusions, can be used for the non-invasive estimation of resting local skeletal muscle blood flow (mBF) and oxygen consumption (), respectively. However, the day-to-day reliability of mBF and responses to stressors such as incremental dynamic exercise has not been established. The aim of this study was to determine the reliability of NIRS-derived mBF and responses from incremental dynamic exercise. Measurements of mBF and were collected in the vastus lateralis of 12 healthy, physically active adults [seven men and five women; 25 (SD 6) years old] during three non-consecutive visits within 10 days. After 10 min rest, participants performed 3 min of rhythmic isotonic knee extension (one extension every 4 s) at 5, 10, 15, 20, 25 and 30% of maximal voluntary contraction (MVC), before four venous occlusions and then two arterial occlusions. The mBF and increased proportionally with intensity [from 0.55 to 7.68 ml min−1 (100 ml)−1 and from 0.05 to 1.86 ml O2 min−1 (100 g)−1, respectively] up to 25% MVC, where they began to plateau at 30% MVC. Moreover, an mBF/ muscle oxygen consumption ratio of ∼5 was consistent for all exercise stages. The intraclass correlation coefficient for mBF indicated high to very high reliability for 10–30% MVC (0.82–0.9). There was very high reliability for across all exercise stages (intraclass correlation coefficient 0.91–0.96). In conclusion, NIRS can reliably assess muscle blood flow and oxygen consumption responses to low- to moderate-intensity exercise, meriting potential applications in clinical diagnosis and therapeutic assessment