Stephen Kent Stephenson, "Ancient Computers, Part I - Rediscovery, Edition 2"
English | 2013 | ISBN: 1490964371 | ASIN: B00DVPPQ78 | EPUB | pages: 74 | 1.0 mb
Ancient Computers is an excellent introduction to the calculating methods of diverse cultures across time. A mixture of history and practical techniques for understanding and using these ancient devices brings the tools of these long-forgotten civilizations to a wide audience. Stephenson writes in an easy-to-understand and accessible manner and the use of diagrams is extensive. Want know how to use an abacus or where it came from? This is the book for you! The book is appropriate for high school audiences and above. Dag Spicer Senior Curator Computer History Museum Mountain View, CA ===== The author ... makes two points that deserve wider dissemination. The first is that he sees the central dividing line of the Salamis Tablet as allowing an additive side and a subtractive side ... and notes that this approach, 'reduces the number of pebbles needed tremendously'. It also makes many calculations easier. One cannot argue with his claims of increased efficiency and this point deserves further investigation. The author's second substantive point is that in attempting to understand ancient mathematics, historians need to pay more attention to the available tools, technology, notation, and terminology to see how particular algorithms may have been performed. The author has a video of himself computing the square root of 2 using a set of Salamis Tablets following Heron's method. It takes him 25 minutes [to achieve the four sexagesimal digit precision of Yale tablet YBC 7289]. His argument is that [making and] using only [mathematical reference] tables and writing intermediate [cuneiform] results on clay would take a lot longer. From review by Prof. Duncan Melville,http://www.stlawu.edu/user/348, in Aestimatio,http://www.ircps.org/aestimatio/9/294-297. ===== People, especially historians, have long struggled to appreciate and understand how Ancient Romans, Greeks, Egyptians, and Babylonians, et al, were able to do their arithmetic calculations. Many say the Ancients "probably" used line abacuses or abaci, a.k.a. counting boards. But most then trivialize the possible impact that use would have on the Ancient cultures because they really don't think those abaci would be very powerful and that they would be extremely hard to use. The (re-)discovery this book documents and explores materialized from the author's experiences in engineering, with a knowledge that design compromises often have to be made; computer programming, especially the different number bases used; the hobby use of a Japanese abacus called the Soroban; and study of the Ancients' numbers and culture. The bottom line is that the Ancients had a powerful and lightning fast computer; powerful and fast compared to any other calculation method available to them in their time. Features included: - multi-base number modes: e.g., sexagesimal, decimal, duodecimal, or nonary; - operating on those numbers in two parts: a signed fraction of the base and a signed exponent of the base, equivalent to scientific notation; - easy and low-cost expandability; and - built-in error checking! On the "standard" Ancient line abacus doing base-10 calculations, the fraction could have 10 significant digits and the exponent 4. Certainly enough for most modern engineering or scientific problems. If you need more, though, just scribe a few more lines on the abacus and add a few more pebbles to your pouch! By the way, 170 small pebbles will suffice for any problem on the "standard" line abacus. They fit in a pouch that can be easily and comfortably carried in a man's trouser pocket. I hope you find Ancient Computers interesting and useful, -Steve Stephenson, July 15, 2010 ===== Edition 2 adds two appendices: N: Nonary Abacus as Candidate for Modern Electronic Implementation; and V: Visualizing the Basis of Abacus Arithmetic (Using Colored Chip Models). -Steve Stephenson, July 2013

Brandon Webb, John David Mann, "Among Heroes: A U.S. Navy SEAL's True Story of Friendship, Heroism, and the Ultimate Sacrifice"
English | 2016 | ISBN: 0451475631, 0451475623 | EPUB | pages: 288 | 10.4 mb
Navy SEAL sniper and New York Times bestselling author Brandon Webb'spersonal account of eight of his friends and fellow SEALs who made the ultimate sacrifice.

Amino Acids, Peptides and Proteins Vol. 37 By Etelka Farkas; Maxim Ryadnov; Luc Brunsveld
2012 | 272 Pages | ISBN: 1849734062 | PDF | 7 MB
Written for researchers, academics and professionals, these papers represent an indispensable reference source on the latest trends and findings in the field of proteins, amino acids and peptides. Content: Preface; Amino acid and petide bioconjugates; Self-assembling peptide materials; Metal complexes of amino acids and peptides; Model systems for folding and teriary contacts in peptides: A perspective from the physical sciences; Protein nanotubes, channels and cages; Prescriptive peptide design; Targeting alpha-helix based protein interactions - nuclear receptors as a case study

Theodore Catton, "American Indians and National Forests"
English | 2017 | ISBN: 0816536511, 0816531994 | PDF | pages: 385 | 4.8 mb
Winner of the Forest History Society's 2017 Charles A. Weyerhaeuser Book Award

I. S. Luthar, I. B. S. Passi , "Algebra Vol 4. Field theory"
English | 2008 | pages: 306 | ISBN: 8173195927 | DJVU | 2,3 mb

African American English: A Linguistic Introduction By Lisa J. Green
2002 | 298 Pages | ISBN: 0521814499 | PDF | 5 MB
This authoritative introduction to African American English (AAE) is the first textbook to look at the grammar as a whole. Clearly organized, it describes patterns in the sentence structure, sound system, word formation and word use. It examines education, speech events in the secular and religious world, and the use of AAE in literature and the media to create black images. It includes exercises to accompany each chapter and is essential reading for students in linguistics, education, anthropology, African American studies and literature.

Ali Ahmad Jalali, "Afghan Guerrilla Warfare: In the Words of the Mjuahideen Fighters"
English | 2002 | ISBN: 0760313229 | EPUB | pages: 448 | 52.1 mb
When the Soviet Union invaded Afghanistan in 1979, few experts believed the fledgling Mujahideen resistance movement had a chance of withstanding the modern, mechanized onslaught of the Soviet Army. But somehow, the Mujahideen prevailed against a larger and decisively better equipped foe. No one predicted the Soviet Union would withdraw in defeat in 1989. With more than 100 first-hand reports from Mujahideen combat veterans and maps illustrating locations and disposition of forces, this book is a tactical look at a decentralized army of foot-mobile guerrillas as they wage war against a superior force. Learn about Mujahideen ambushes, raids, shelling attacks, fights against heliborne insertions, attacks on Soviet strong points, and urban combat in this rare look at the Soviet-Afghan conflict.

Advances in Intelligent Information Hiding and Multimedia Signal Processing: Proceeding of the IIH-MSP 2021 & FITAT 2021, Kaohsiung, Taiwan, Volume 2 by Jeng-Shyang Pan
English | PDF | 2022 | 355 Pages | ISBN : 9811910529 | 10.7 MB
This book presents selected papers from the 17th International Conference on Intelligent Information Hiding and Multimedia Signal Processing, in conjunction with the 14th International Conference on Frontiers of Information Technology, Applications and Tools, held on 29-31 October 2021 in Kaohsiung, Taiwan. It is divided into two volumes and discusses latest research outcomes in the field of information technology (IT) including but not limited to information hiding, multimedia signal processing, big data, data mining, bioinformatics, database, industrial and internet of things, and their applications.

Advances in Artificial Intelligence and Security: 8th International Conference on Artificial Intelligence and Security, ICAIS 2022, Qinghai, China, July 15-20, 2022, Proceedings, Part II
by Xingming Sun, Xiaorui Zhang
English | 2022 | ISBN: 3031067606 | 732 Pages | True ePUB | 81 MB

Advances in Artificial Intelligence and Security : 8th International Conference on Artificial Intelligence and Security, ICAIS 2022, Qinghai, China, July 15-20, 2022, Proceedings, Part I
by Xingming Sun, Xiaorui Zhang
English | 2022 | ISBN: 3031067665 | 730 Pages | True ePUB | 87 MB