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If you're looking for free educational programs or materials in the US and Canada, we'll help you find what you need for students and learners. ![]() Free Download Circulatory System Advanced (Quick Study: Academic) English | 2013 | ISBN: 1423220374 | 6 Pages | PDF (True) | 8.4 MB Our new guide on the circulatory system, illustrated by accomplished anatomical artist Vincent Perez, includes in-depth coverage of veins and arteries, including depictions over and under transparent bone to better expose the system around the head, neck, and heart, as well as separate views of major organs and extremities. From teachers and students of anatomy, to medical professionals and therapists, this guide is perfect for your medical study or practice. ![]() Free Download Circular Array-Based Radio Frequency OAM Communications English | 2024 | ISBN: 3031375882 | 443 Pages | PDF EPUB (True) | 52 MB This book presents the modeling and transmission theory of RF OAM communications. The book features the UCA-based RF point-to-point OAM communication system, the UCA-based RF point-to-multipoint OAM wireless backhaul network, the HCCL structure for long-distance OAM transmissions, and the UCA-based joint OAM RadCom scheme. For the UCA-based RF point-to-point OAM communication system, a 2-D ESPRIT-based distance and AoA estimation method is first introduced, followed by an OAM reception scheme including the hybrid mechanical and electronic beam steering with the estimated AoA and the amplitude detection with the estimated distance. The proposed RF OAM communication scheme is extended to the RF OAM-MIMO system equipped with UCCAs. For the UCA-based RF point-to-multipoint OAM wireless backhaul network, an OAM-based multi-user distance and AoA estimation method is introduced, followed by a multi-user OAM preprocessing scheme. At last, the proposed methods are extended to the downlink multi-user OAM-MIMO wireless backhaul system equipped with UCCAs. Moreover, a novel HCCL structure is introduced to realize long-distance OAM transmission. For the UCA-based joint OAM RadCom scheme, an OAM-based 3-D super-resolution position estimation and rotation velocity detection method is introduced, and then the PCRB of the OAM-based estimates and the transmission rate of the integrated system are derived and analyzed. To achieve the best performance trade-off, the transmitted integrated OAM beams is optimized by means of an exhaustive search method. Finally, this book discusses future research directions to inspire further investigation in the field of RF OAM communications from different perspectives. ![]() Free Download Circuit Engineering & Raspberry Pi 2: The Beginner's Guide to Electronic Circuits, Semi-Conductors, Circuit Boards, and Basic Electronics & Raspberry Pi 2 Programming Made Easy by Solis Tech English | January 15, 2016 | ISBN: 1523425865 | 162 pages | PDF | 28 Mb ![]() Free Download Circuit Engineering & Human-Computer Interaction: The Beginner's Guide to Electronic Circuits, Semi-Conductors, Circuit Boards, and Basic Electronics & The Fundamentals Made Easy! by Solis Tech English | 2016 | ISBN: N/A | ASIN: B01ACUJ80U | 158 pages | PDF | 30 Mb ![]() Free Download Laurie Lee, "Cider with Rosie" English | 2002 | pages: 72 | ISBN: 0573017352 | EPUB | 3,4 mb Poet Laurie Lee was born in 1914 in a small Cotswold village and grew up during a time of change when the rural traditions of past centuries were being swept aside in the path of twentieth-century progress. 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