The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform
Rory A. Cooper - One of the best experts on this subject based on the ideXlab platform.
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Kinematic characterization of wheelchair Propulsion
Journal of rehabilitation research and development, 1998Co-Authors: S.d. Shimada, R.n. Robertson, M L Bonninger, Rory A. CooperAbstract:Rehabilitation scientists and biomedical engineers have been investigating wheelchair Propulsion biomechanics in order to prevent musculoskeletal injuries. Several studies have investigated wheelchair Propulsion biomechanics; however, few have examined wheelchair Propulsion stroke patterns. The purpose of this study was to characterize wheelchair Propulsion stroke patterns by investigating joint accelerations, joint range of motions, wheelchair Propulsion phases, and stroke efficiency. Seven experienced wheelchair users (5 males, 2 females) were filmed using a three-camera motion analysis system. Each subject pushed a standard wheelchair fitted with a force-sensing pushrim (SMARTWheel) at two speeds (1.3 and 2.2 m/s). The elbow angle was analyzed in the sagittal plane, while the shoulder joint was analyzed in the sagittal and frontal planes. Three distinctly different stroke patterns: semi-circular (SC), single looping-over-Propulsion (SLOP), and double looping-over-Propulsion (DLOP), were identified from the kinematic analysis. Through our analysis of these patterns, we hypothesized that SC was more biomechanically efficient than the other stroke patterns. Future studies using a larger number of subjects and strokes may reveal more significant distinctions in efficiency measures between stroke patterns.
Richard R Neptune - One of the best experts on this subject based on the ideXlab platform.
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Individual muscle contributions to push and recovery subtasks during wheelchair Propulsion.
Journal of Biomechanics, 2011Co-Authors: Jeffery W. Rankin, W. Mark Richter, Richard R NeptuneAbstract:Manual wheelchair Propulsion places considerable physical demand on the upper extremity and is one of the primary activities associated with the high prevalence of upper extremity overuse injuries and pain among wheelchair users. As a result, recent effort has focused on determining how various Propulsion techniques influence upper extremity demand during wheelchair Propulsion. However, an important prerequisite for identifying the relationships between Propulsion techniques and upper extremity demand is to understand how individual muscles contribute to the mechanical energetics of wheelchair Propulsion. The purpose of this study was to use a forward dynamics simulation of wheelchair Propulsion to quantify how individual muscles deliver, absorb and/or transfer mechanical power during Propulsion. The analysis showed that muscles contribute to either push (i.e., deliver mechanical power to the handrim) or recovery (i.e., reposition the arm) subtasks, with the shoulder flexors being the primary contributors to the push and the shoulder extensors being the primary contributors to the recovery. In addition, significant activity from the shoulder muscles was required during the transition between push and recovery, which resulted in increased co-contraction and upper extremity demand. Thus, strengthening the shoulder flexors and promoting Propulsion techniques that improve transition mechanics have much potential to reduce upper extremity demand and improve rehabilitation outcomes.
Max Calabro - One of the best experts on this subject based on the ideXlab platform.
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An Introduction to Energetic Materials for Propulsion
Chemical Rocket Propulsion, 2017Co-Authors: L. T. Deluca, Valery P. Sinditskii, Max Calabro, Toru Shimada, Anthony P. ManzaraAbstract:This chapter is a general introduction to the overall organization of the book and its main topics. Contributions to the volume were collected from authors of 13 countries including those most engaged in space exploration missions. This chapter was assembled with the support of many of the volume contributors and other internationally qualified experts in the field of energetic materials. Highlights of the state-of-the-art and future needs are outlined in a number of areas extending from the classical applications of chemical Propulsion (solid, liquid, hybrid, gel) to the collateral areas of unconventional applications and energetic materials Life-Cycle Management. Prospective new energetic materials and new concepts in chemical Propulsions are discussed as well as practical problems related to quality control, aging, hazards, impact, disposal, and remediation of the energetic materials in use today or in the near future. For every chapter, a short introduction is given of each included paper in order to help the reader to identify the contributions most suitable for their specific needs or interests. The final book chapter is dedicated to an historical survey of the Russian developments in solid rocket Propulsion. No matter how impressive from both a theoretical and experimental viewpoint, for a variety of reasons, they are still little known, if not misunderstood, beyond the national barriers.
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Chemical Rocket Propulsion - Chemical Rocket Propulsion
Springer Aerospace Technology, 2017Co-Authors: Luigi T. De Luca, Valery P. Sinditskii, Toru Shimada, Max CalabroAbstract:Developed and expanded from the work presented at the New Energetic Materials and Propulsion Techniques for Space Exploration workshop in June 2014, this book contains new scientific results, up-to-date reviews, and inspiring perspectives in a number of areas related to the energetic aspects of chemical rocket Propulsion. This collection covers the entire life of energetic materials from their conceptual formulation to practical manufacturing; it includes coverage of theoretical and experimental ballistics, performance properties, as well as laboratory-scale and full system-scale, handling, hazards, environment, ageing, and disposal. Chemical Rocket Propulsion is a unique work, where a selection of accomplished experts from the pioneering era of space Propulsion and current technologists from the most advanced international laboratories discuss the future of chemical rocket Propulsion for access to, and exploration of, space. It will be of interest to both postgraduate and final-year undergraduate students in aerospace engineering, and practicing aeronautical engineers and designers, especially those with an interest in Propulsion, as well as researchers in energetic materials
Anthony P. Manzara - One of the best experts on this subject based on the ideXlab platform.
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An Introduction to Energetic Materials for Propulsion
Chemical Rocket Propulsion, 2017Co-Authors: L. T. Deluca, Valery P. Sinditskii, Max Calabro, Toru Shimada, Anthony P. ManzaraAbstract:This chapter is a general introduction to the overall organization of the book and its main topics. Contributions to the volume were collected from authors of 13 countries including those most engaged in space exploration missions. This chapter was assembled with the support of many of the volume contributors and other internationally qualified experts in the field of energetic materials. Highlights of the state-of-the-art and future needs are outlined in a number of areas extending from the classical applications of chemical Propulsion (solid, liquid, hybrid, gel) to the collateral areas of unconventional applications and energetic materials Life-Cycle Management. Prospective new energetic materials and new concepts in chemical Propulsions are discussed as well as practical problems related to quality control, aging, hazards, impact, disposal, and remediation of the energetic materials in use today or in the near future. For every chapter, a short introduction is given of each included paper in order to help the reader to identify the contributions most suitable for their specific needs or interests. The final book chapter is dedicated to an historical survey of the Russian developments in solid rocket Propulsion. No matter how impressive from both a theoretical and experimental viewpoint, for a variety of reasons, they are still little known, if not misunderstood, beyond the national barriers.
Steven P. Berg - One of the best experts on this subject based on the ideXlab platform.
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Review of multimode space Propulsion
Progress in Aerospace Sciences, 2020Co-Authors: Joshua L. Rovey, Christopher T. Lyne, Alex J. Mundahl, Nicolas Rasmont, Matthew S. Glascock, Mitchell J. Wainwright, Steven P. BergAbstract:Abstract Multimode Propulsion is the integration of two or more propulsive modes with shared propellant into a single spacecraft Propulsion system. Multimode Propulsion is emerging as an enabling technology that promises enhanced capabilities for spacecraft and space missions, and can therefore play an important role in the future of in-space Propulsion. Multimode Propulsion has the potential to provide unprecedented flexibility and adaptability to spacecraft as a direct result of shared propellant, and can provide mass savings for certain missions. These benefits can apply regardless of spacecraft size. Additional mass savings may be realized by sharing thruster hardware between modes, especially for small satellites. Numerous multimode concepts have been explored and documented in the literature. Concepts combining cold gas, monopropellant, bipropellant, and solid chemical Propulsion with electrothermal, electrostatic, and electromagnetic electric Propulsion have all been investigated. Electrospray electric Propulsion paired with monopropellant chemical Propulsion has perhaps received the most recent attention. We review the nature of multimode Propulsion, mission analyses, benefits, and specific multimode concepts.
