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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 76
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 148
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Author: Alejandro Sobron
Publisher: Linköping University Electronic Press
ISBN: 9176852202
Category :
Languages : en
Pages : 130
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Book Description
Downscaled physical models, also referred to as subscale models, have played an essential role in the investigation of the complex physics of flight until the recent disruption of numerical simulation. Despite the fact that improvements in computational methods are slowly pushing experimental techniques towards a secondary role as verification or calibration tools, real-world testing of physical prototypes still provides an unmatched confidence. Physical models are very effective at revealing issues that are sometimes not correctly identified in the virtual domain, and hence can be a valuable complement to other design tools. But traditional wind-tunnel testing cannot always meet all of the requirements of modern aeronautical research and development. It is nowadays too expensive to use these scarce facilities to explore different design iterations during the initial stages of aircraft development, or to experiment with new and immature technologies. Testing of free-flight subscale models, referred to as Subscale Flight Testing (SFT), could offer an affordable and low-risk alternative for complementing conventional techniques with both qualitative and quantitative information. The miniaturisation of mechatronic systems, the advances in rapid-prototyping techniques and power storage, as well as new manufacturing methods, currently enable the development of sophisticated test objects at scales that were impractical some decades ago. Moreover, the recent boom in the commercial drone industry has driven a quick development of specialised electronics and sensors, which offer nowadays surprising capabilities at competitive prices. These recent technological disruptions have significantly altered the cost-benefit function of SFT and it is necessary to re-evaluate its potential in the contemporary aircraft development context. This thesis aims to increase the comprehension and knowledge of the SFT method in order to define a practical framework for its use in aircraft design; focusing on low-cost, short-time solutions that don’t require more than a small organization and few resources. This objective is approached from a theoretical point of view by means of an analysis of the physical and practical limitations of the scaling laws; and from an empirical point of view by means of field experiments aimed at identifying practical needs for equipment, methods, and tools. A low-cost data acquisition system is developed and tested; a novel method for semi-automated flight testing in small airspaces is proposed; a set of tools for analysis and visualisation of flight data is presented; and it is also demonstrated that it is possible to explore and demonstrate new technology using SFT with a very limited amount of economic and human resources. All these, together with a theoretical review and contextualisation, contribute to increasing the comprehension and knowledge of the SFT method in general, and its potential applications in aircraft conceptual design in particular.
Author: Richard Jackson Harris
Publisher: Routledge
ISBN: 1135850372
Category : Language Arts & Disciplines
Languages : en
Pages : 559
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Book Description
In this fifth edition of A Cognitive Psychology of Mass Communication, author Richard Jackson Harris continues his examination of how our experiences with media affect the way we acquire knowledge about the world, and how this knowledge influences our attitudes and behavior. Presenting theories from psychology and communication along with reviews of the corresponding research, this text covers a wide variety of media and media issues, ranging from the commonly discussed topics – sex, violence, advertising – to lesser-studied topics, such as values, sports, and entertainment education. The fifth and fully updated edition offers: highly accessible and engaging writing contemporary references to all types of media familiar to students substantial discussion of theories and research, including interpretations of original research studies a balanced approach to covering the breadth and depth of the subject discussion of work from both psychology and media disciplines. The text is appropriate for Media Effects, Media & Society, and Psychology of Mass Media coursework, as it examines the effects of mass media on human cognitions, attitudes, and behaviors through empirical social science research; teaches students how to examine and evaluate mediated messages; and includes mass communication research, theory and analysis.
Author: University of Illinois (Urbana-Champaign campus)
Publisher:
ISBN:
Category : College yearbooks
Languages : en
Pages : 246
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Author: Zongxuan Sun
Publisher: CRC Press
ISBN: 1439820198
Category : Science
Languages : en
Pages : 210
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Book Description
Better Understand the Relationship between Powertrain System Design and Its Control IntegrationWhile powertrain system design and its control integration are traditionally divided into two different functional groups, a growing trend introduces the integration of more electronics (sensors, actuators, and controls) into the powertrain system.
Author: Seyed Ehtesham Hasnain
Publisher: Springer
ISBN: 9789813294127
Category : Medical
Languages : en
Pages : 514
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Book Description
This book reviews recent advances in the molecular and infection biology, pathology, and molecular epidemiology of Mycobacterium tuberculosis, as well as the identification and validation of novel molecular drug targets for the treatment of this mycobacterial disease. Despite being completely curable, tuberculosis is still one of the leading global causes of death. M. tuberculosis, the causative organism – one of the smartest pathogens known – adopts highly intelligent strategies for survival and pathogenesis. Presenting a wealth of information on the molecular infection biology of M. tuberculosis, as well as nontuberculous mycobacteria (NTM), the book provides an overview of the functional role of the PE/PPE group of proteins, which is exclusive to the genus Mycobacteria, of host-pathogen interactions, and virulence. It also explores the pathogenesis of the infection, pathology, epidemiology, and diagnosis of NTM. Finally it discusses current and novel approaches in vaccine development against tuberculosis, including the role of nanotechnology. With state-of-the-art contributions from experts in the respective domains, this book is an informative resource for practitioners as well as medical postgraduate students and researchers.
Author: National Academies of Sciences, Engineering, and Medicine
Publisher: National Academies Press
ISBN: 0309440998
Category : Technology & Engineering
Languages : en
Pages : 123
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Book Description
The primary human activities that release carbon dioxide (CO2) into the atmosphere are the combustion of fossil fuels (coal, natural gas, and oil) to generate electricity, the provision of energy for transportation, and as a consequence of some industrial processes. Although aviation CO2 emissions only make up approximately 2.0 to 2.5 percent of total global annual CO2 emissions, research to reduce CO2 emissions is urgent because (1) such reductions may be legislated even as commercial air travel grows, (2) because it takes new technology a long time to propagate into and through the aviation fleet, and (3) because of the ongoing impact of global CO2 emissions. Commercial Aircraft Propulsion and Energy Systems Research develops a national research agenda for reducing CO2 emissions from commercial aviation. This report focuses on propulsion and energy technologies for reducing carbon emissions from large, commercial aircraftâ€" single-aisle and twin-aisle aircraft that carry 100 or more passengersâ€"because such aircraft account for more than 90 percent of global emissions from commercial aircraft. Moreover, while smaller aircraft also emit CO2, they make only a minor contribution to global emissions, and many technologies that reduce CO2 emissions for large aircraft also apply to smaller aircraft. As commercial aviation continues to grow in terms of revenue-passenger miles and cargo ton miles, CO2 emissions are expected to increase. To reduce the contribution of aviation to climate change, it is essential to improve the effectiveness of ongoing efforts to reduce emissions and initiate research into new approaches.
Author: David Nixon
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 410
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Book Description
This volume complements Transonic aerodynamics (v.81 in the series) which is concerned with steady flow. This is the only book to address the subject of unsteady transonic aerodynamics, a field much different from steady aerodynamics. The most pronounced difference is the complex shock wave motions
Author: Edward Steere
Publisher:
ISBN:
Category : Swahili language
Languages : en
Pages : 492
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Book Description
Author: Eva Gross
Publisher:
ISBN: 9780984854417
Category : Law
Languages : en
Pages : 0
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Book Description
Over the past two decades the United States and Europe have engaged actively in efforts to prevent conflict and to manage crises around the world. How effective have such efforts been, and how could they be improved? This volume offers recommendations and applies them to specific case studies. In includes a Crisis Management Toolbox that outlines the key principles, actors, and instruments guiding such efforts.
