Download or read book Polyethylene Free Balloon Design from the Perspectives of User and Designer written by James F. Dwyer and published by . This book was released on 1982 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Those who use large polyethylene balloons for experimental programs are presented with background information on the processes of selecting and designing balloons to meet their respective mission requirements. The effects of payload weight, altitude, duration, and vertical control on both the total payload weight and the balloon size are discussed with respect to these processes. The need to define missions success in terms of realistic requirements is emphasized and a mission planning procedure is proposed. Assumptions and problems in contemporary balloon design are discussed, and design and analysis procedures based on the loads and geometry at the time of launch are developed. Dynamic launch shock is proposed as a criterion for shell thickness, and a model of polyethylene film modulus is developed to account for strain rate and stress and strain relaxation at a launch temperature of 23 degrees C. Computer codes have been written for the processes of balloon selection and balloon design to meet mission requirements. They are intended to be a basis for more efficient, interactive mission planning. Finally, improvements to the balloon design process are proposed and discussed.
Download or read book Polyethylene Free Balloon Design from the Perspectives of User and Designer written by James F. Dwyer and published by . This book was released on 1982 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Those who use large polyethylene balloons for experimental programs are presented with background information on the processes of selecting and designing balloons to meet their respective mission requirements. The effects of payload weight, altitude, duration, and vertical control on both the total payload weight and the balloon size are discussed with respect to these processes. The need to define missions success in terms of realistic requirements is emphasized and a mission planning procedure is proposed. Assumptions and problems in contemporary balloon design are discussed, and design and analysis procedures based on the loads and geometry at the time of launch are developed. Dynamic launch shock is proposed as a criterion for shell thickness, and a model of polyethylene film modulus is developed to account for strain rate and stress and strain relaxation at a launch temperature of 23 degrees C. Computer codes have been written for the processes of balloon selection and balloon design to meet mission requirements. They are intended to be a basis for more efficient, interactive mission planning. Finally, improvements to the balloon design process are proposed and discussed.
Download or read book A Balloon Design for 9000 Pounds at 90 000 Feet written by James F. Dwyer and published by . This book was released on 1983 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The history of the development of free balloons to carry heavy payloads into the stratosphere is reviewed with the objective of developing a design based on existing technologies for a balloon to carry 9000 lb to 90,000 ft. Reinforced polyester balloons, in tandem balloon configurations, are discussed with respect to materials, design criteria, and performance. The problem of launch dynamics for single cell polyethylene balloons is also discussed and it is concluded that a capped single cell polyethylene balloon can be dynamically launched, successfully, with the 9000-lb payload. Further, it is concluded that the single cell polyethylene balloon is the best means to meet the objective. Specifications for such a balloon are provided.
Download or read book Instrumentation Papers written by and published by . This book was released on 1982 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1989 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Factors Affecting the Vertical Motion of a Zero pressure Polyethylene Free Balloon written by James F. Dwyer and published by . This book was released on 1985 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper critiques existing aerodynamic-thermodynamic models for predicting the vertical motion of free balloon systems. It demonstrates that: a) the aerodynamic drag coefficient model should be based on Froude number and fractional volume as well as Reynolds number; b) there has been a widespread error in definition of the instantaneous mass of the balloon film involved in the heat transfer process; c) the gas bubble cannot be modelled as a sphere; d) the gas bubble is asymmetrical except when near or at its natural ceiling altitude; and e) the actual gas bubble shape, and most probably the added mass, is directly related to the type of gore pattern. Finally, a procedure is proposed for the analysis of actual flight data to enable the development of a practical, but also theoretically sound, model of the aerodynamic drag coefficient of a zero-pressure, free balloon- and subsequent refinement of the heat transfer models for direct and reflected solar energy.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1988-08 with total page 1234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1983 with total page 1166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interference Problems on Wing fuselage Combinations in Inviscid Incompressible Flow written by Aeronautical Research Council (Great Britain) and published by . This book was released on 1974 with total page 1212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index Keyword A L written by and published by . This book was released on 1983 with total page 1216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Landscape Graphics written by Grant Reid and published by Watson-Guptill. This book was released on 2012-08-01 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Announcing the new revised edition of the classic industry reference! Landscape Graphics is the architect’s ultimate guide to all the basic graphics techniques used in landscape design and landscape architecture. Progressing from the basics into more sophisticated techniques, this guide offers clear instruction on graphic language and the design process, the basics of drafting, lettering, freehand drawing and conceptual diagramming, perspective drawing, section elevations, and more. It also features carefully sequenced exercises, a complete file of graphic symbols for sections and perspectives, and a handy appendix of conversions and equivalents.
Download or read book Backpacker written by and published by . This book was released on 2007-09 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Backpacker brings the outdoors straight to the reader's doorstep, inspiring and enabling them to go more places and enjoy nature more often. The authority on active adventure, Backpacker is the world's first GPS-enabled magazine, and the only magazine whose editors personally test the hiking trails, camping gear, and survival tips they publish. Backpacker's Editors' Choice Awards, an industry honor recognizing design, feature and product innovation, has become the gold standard against which all other outdoor-industry awards are measured.
Download or read book The Design Thinking Playbook written by Michael Lewrick and published by John Wiley & Sons. This book was released on 2018-05-03 with total page 943 pages. Available in PDF, EPUB and Kindle. Book excerpt: A radical shift in perspective to transform your organization to become more innovative The Design Thinking Playbook is an actionable guide to the future of business. By stepping back and questioning the current mindset, the faults of the status quo stand out in stark relief—and this guide gives you the tools and frameworks you need to kick off a digital transformation. Design Thinking is about approaching things differently with a strong user orientation and fast iterations with multidisciplinary teams to solve wicked problems. It is equally applicable to (re-)design products, services, processes, business models, and ecosystems. It inspires radical innovation as a matter of course, and ignites capabilities beyond mere potential. Unmatched as a source of competitive advantage, Design Thinking is the driving force behind those who will lead industries through transformations and evolutions. This book describes how Design Thinking is applied across a variety of industries, enriched with other proven approaches as well as the necessary tools, and the knowledge to use them effectively. Packed with solutions for common challenges including digital transformation, this practical, highly visual discussion shows you how Design Thinking fits into agile methods within management, innovation, and startups. Explore the digitized future using new design criteria to create real value for the user Foster radical innovation through an inspiring framework for action Gather the right people to build highly-motivated teams Apply Design Thinking, Systems Thinking, Big Data Analytics, and Lean Start-up using new tools and a fresh new perspective Create Minimum Viable Ecosystems (MVEs) for digital processes and services which becomes for example essential in building Blockchain applications Practical frameworks, real-world solutions, and radical innovation wrapped in a whole new outlook give you the power to mindfully lead to new heights. From systems and operations to people, projects, culture, digitalization, and beyond, this invaluable mind shift paves the way for organizations—and individuals—to do great things. When you're ready to give your organization a big step forward, The Design Thinking Playbook is your practical guide to a more innovative future.
Download or read book Democratizing Innovation written by Eric Von Hippel and published by MIT Press. This book was released on 2006-02-17 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: The process of user-centered innovation: how it can benefit both users and manufacturers and how its emergence will bring changes in business models and in public policy. Innovation is rapidly becoming democratized. Users, aided by improvements in computer and communications technology, increasingly can develop their own new products and services. These innovating users—both individuals and firms—often freely share their innovations with others, creating user-innovation communities and a rich intellectual commons. In Democratizing Innovation, Eric von Hippel looks closely at this emerging system of user-centered innovation. He explains why and when users find it profitable to develop new products and services for themselves, and why it often pays users to reveal their innovations freely for the use of all.The trend toward democratized innovation can be seen in software and information products—most notably in the free and open-source software movement—but also in physical products. Von Hippel's many examples of user innovation in action range from surgical equipment to surfboards to software security features. He shows that product and service development is concentrated among "lead users," who are ahead on marketplace trends and whose innovations are often commercially attractive. Von Hippel argues that manufacturers should redesign their innovation processes and that they should systematically seek out innovations developed by users. He points to businesses—the custom semiconductor industry is one example—that have learned to assist user-innovators by providing them with toolkits for developing new products. User innovation has a positive impact on social welfare, and von Hippel proposes that government policies, including R&D subsidies and tax credits, should be realigned to eliminate biases against it. The goal of a democratized user-centered innovation system, says von Hippel, is well worth striving for. An electronic version of this book is available under a Creative Commons license.
Download or read book Popular Mechanics written by and published by . This book was released on 2000-01 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Popular Mechanics inspires, instructs and influences readers to help them master the modern world. Whether it’s practical DIY home-improvement tips, gadgets and digital technology, information on the newest cars or the latest breakthroughs in science -- PM is the ultimate guide to our high-tech lifestyle.
Download or read book Astronautics Aeronautics written by and published by . This book was released on 1979 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New York Magazine written by and published by . This book was released on 1997-06-23 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: New York magazine was born in 1968 after a run as an insert of the New York Herald Tribune and quickly made a place for itself as the trusted resource for readers across the country. With award-winning writing and photography covering everything from politics and food to theater and fashion, the magazine's consistent mission has been to reflect back to its audience the energy and excitement of the city itself, while celebrating New York as both a place and an idea.
