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Smith , Ahmed Kovacevic English | PDF (True) | 2005 | 145 Pages | ISBN : 3540242759 | 5.5 MB Althoughtheprinciplesofoperationofhelicalscrewmachines,ascompressors or expanders, have been well known for more than 100 years, it is only during the past 30 years that these machines have become widely used. The main reasons for the long period before they were adopted were their relatively poor e?ciency and the high cost of manufacturing their rotors. Two main developments led to a solution to these di?culties. The ?rst of these was the introduction of the asymmetric rotor pro?le in 1973. This reduced the bl- hole area, which was the main source of internal leakage by approximately 90%, and thereby raised the thermodynamic e?ciency of these machines, to roughly the same level as that of traditional reciprocating compressors. The second was the introduction of precise thread milling machine tools at - proximately the same time. This made it possible to manufacture items of complex shape, such as the rotors, both accurately and cheaply. From then on, as a result of their ever improving e?ciencies, high rel- bility and compact form, screw compressors have taken an increasing share of the compressor market, especially in the ?elds of compressed air production, and refrigeration and air conditioning, and today, a substantial proportion of compressors manufactured for industry are of this type. Despite, the now wide usage of screw compressors and the publication of many scienti?c papers on their development, only a handful of textbooks have been published to date, which give a rigorous exposition of the principles of their operation and none of these are in English. ![]() Free Download Sakya Pandita: Three Biographies by Drogon Chogyal Phakpa, Gorampa Sonam Senge, Jamgon Ameshab English | May 27, 2025 | ISBN: 1614297576 | True EPUB | 224 pages | 29.2 MB A set of classic biographies of Sakya Pandita-one of Tibet's greatest scholars and religious masters. ![]() Free Download Rural Technology Development and Delivery: RuTAG and Its Synergy with Other Initiatives by Subir Kumar Saha English | EPUB | 2019 | 357 Pages | ISBN : 9811364346 | 168.8 MB This book comprises the proceedings of a rural technologies conference organised by the Rural Technology Action Group (RuTAG), which was conceptualized and initiated by Principal Scientific Adviser (PSA) to the Government of India R. Chidambaram in 2003-04. The book highlights case studies and research into providing science and technology interventions for the development of rural areas. Covering various aspects of research carried out in the area of rural technologies, it offers a valuable resource for researchers, professionals, and policymakers alike. ![]() Free Download Running the Old Road in Yellowstone: One Man's Journey of Discovery and Redemption by Tim Norris English | May 27, 2025 | ISBN: 1961293277, 9781961293281 | True EPUB | 176 pages | 11.6 MB An inspiring and transporting book detailing one man's journey of self-realization as he spends time working and running in Yellowstone. ![]() Free Download Robert Shaw: An Actor's Life on the Set of JAWS and Beyond by Christopher Shaw Myers English | May 27, 2025 | ISBN: 0806544325 | True EPUB | 320 pages | 2.6 MB Just in time for the 50th anniversary of Steven Spielberg's Jaws, an intimate and richly-told portrait of the iconic actor and writer Robert Shaw, from his portrayal of the legendary shark hunter Captain Quint and beyond, written lovingly but honestly by his nephew. ![]() Free Download Regeneration of Complex Capital Goods: Contributions to the Final Symposium of the Collaborative Research Center 871 by Joerg R. Seume, Berend Denkena, Philipp Gilge English | EPUB (True) | 2025 | 488 Pages | ISBN : 3031513940 | 122.8 MB This book compiles the groundbreaking research conducted by the Collaborative Research Center (CRC) 871, centered around the "Regeneration of Complex Capital Goods." This comprehensive work unveils an array of innovative methods developed through CRC 871, designed to revitalize and enhance the functional attributes of these critical assets. From non-destructive characterization of heavily stressed turbine components to the dynamic behavior of regenerated structural elements, each chapter offers a meticulous exploration of diverse facets in the field. The book also addresses the crucial consideration of variability in repair processes and material properties, as well as the comprehensive control of regeneration processes. 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