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Start your reading journey today on DL4ALL.org and unlock a world of imagination, knowledge, and inspiration!  Free Download Orthogonality and Spacetime Geometry by Robert Goldblatt English | PDF | 1987 | 199 Pages | ISBN : 038796519X | 13.3 MB This book examines the geometrical notion of orthogonality, and shows how to use it as the primitive concept on which to base a metric structure in affine geometry. The subject has a long history, and an extensive literature, but whatever novelty there may be in the study presented here comes from its focus on geometries hav ing lines that are self-orthogonal, or even singular (orthogonal to all lines). The most significant examples concern four-dimensional special-relativistic spacetime (Minkowskian geometry), and its var ious sub-geometries, and these will be prominent throughout. But the project is intended as an exercise in the foundations of geome try that does not presume a knowledge of physics, and so, in order to provide the appropriate intuitive background, an initial chapter has been included that gives a description of the different types of line (timelike, spacelike, lightlike) that occur in spacetime, and the physical meaning of the orthogonality relations that hold between them. The coordinatisation of affine spaces makes use of constructions from projective geometry, including standard results about the ma trix represent ability of certain projective transformations (involu tions, polarities). I have tried to make the work sufficiently self contained that it may be used as the basis for a course at the ad vanced undergraduate level, assuming only an elementary knowledge of linear and abstract algebra.  Free Download Orthogonal Frequency Division Multiplexing for Wireless Communications by Ye Li, Gordon L. Stüber English | PDF (True) | 2006 | 314 Pages | ISBN : 0387290958 | 12.8 MB Orthogonal Frequency Division Multiplexing for Wireless Communications is an edited volume with contributions by leading authorities in the subject of OFDM. Its coverage consists of principles, important wireless topics (e.g. Synchronization, channel estimation, etc.) and techniques. Included is information for advancing wireless communication in a multipath environment with an emphasis on implementation of OFDM in base stations.  Free Download Orphan Girl: The Olesnicki Episode: One Body with Two Souls Entwined: An Epic Tale of Married Love in Seventeenth-Century Poland by Anna Stanislawska and Barry Keane English | 2021 | ISBN: 1649590423 | 120 Pages | True PDF | 2.9 MB  Free Download Organizational Behavior: Improving Performance and Commitment in the Workplace, 7th Edition by Jason Colquitt, Jeffery LePine English | 2020 | ISBN: 1260261557 | 609 Pages | True PDF | 47 MB  Free Download Ordinary Wonders: Stories of Unexpected Grace by Olesia Nikolaeva, Alexandra Weber English | May 1, 2018 | ISBN: 0884654230 | 320 pages | EPUB | 0.92 Mb The Deceitful Onion Bulb. A Blessing to Smuggle. The Conjuror of Rain. In this collection of stories as whimsical as their titles, award-winning author Olesia Nikolaeva poignantly recounts life for Christian believers in Soviet and post-Soviet Russia. In a manner reminiscent of the bestselling Everyday Saintsthese tales reveal a common theme - the subtle, sometimes imperceptible movement of Divine Providence at work in the lives of saints and sinners alike. Her writings bring us to what the ancient Celts called "thin places" where the boundaries of heaven and earth meet and the sacred and the secular can no longer be distinguished.  Free Download Order and Chaos in Dynamical Astronomy by George Contopoulos English | PDF | 2002 | 633 Pages | ISBN : 3540433600 | 57.8 MB There have been many books on Dynamical Astronomy up to now. Many are devoted to Celestial Mechanics, but there are also several books on Stellar and Galactic Dynamics. The first books on stellar dynamics dealt mainly with the statistics of stellar motions (e. g. Smart's "Stellar Dynamics" (1938), or Trumpler and Weaver's "Statistical Astronomy" (1953)). A classical book in this field is Chandrasekhar's "Principles of Stellar Dynamics" (1942) that dealt mainly with the time of relaxation, the solutions of Liouville's equation, and the dynamics of clusters. In the Dover edition of this book (1960) an extended Appendix was added, containing the statistical mechanics of stellar systems, a quite "modern" subject at that time. The need for a classroom book was covered for several years by the book of Mihalas and Routly "Galactic Astronomy" (1969).  Free Download Eng Soon Teoh, "Orchid Species from Himalaya and Southeast Asia Vol. 2 (G - P)" English | 2021 | ISBN: 3030804275, 3030804305 | PDF | pages: 363 | 88.1 mb A presentation of over 700 popular orchid species in 104 genera carefully detailed with beautiful photographs and concise descriptions of plants, their distribution and habitats by a well-known author and photographer. Each genus is assigned a separate chapter. Coverage of the most commonly cultivated Asian species including their varieties and cultivars (e.g. in Bulbophyllum 72 species; Coelogyne 33 species; Dendrobium 161 species; Paphiopedilum 58 species; Phalaenopsis 60 species; Vanda 44 species) is exhaustive. The orchids are photographed from their best perspective, individual blooms and entire inflorescence: additionally, many species are also shown growing in their natural habitat. Representative hybrids are included to illustrate how some species have contributed to show-worthiness of various genera, their adaptation to a wider climate range, and easy cultivation. This book is a pleasure to view; simultaneously, an easy reference for the identification of orchid species and it provides a guide on how best to grow them. Nowhere else will one find so many popular species beautifully illustrated in a single volume.  Free Download Victor Argueta-Diaz, "Optical Sensors: An Introduction with Lab Demonstrations" English | ISBN: 0750348747 | 2023 | 275 pages | PDF | 30 MB This comprehensive introductory book on optical sensors provides an overview of essential principles used in optics. Its primary aim is to support students and professionals in developing a practical understanding, accomplished through a dedicated lab section that facilitates hands-on experience and further exploration of the covered theories.  Free Download Operations Strategy, 5th Edition by Slack Lewis English | 2018 | ISBN: 9353060451 | 505 Pages | PDF (True) | 12 MB  Free Download Operational Amplifiers Theory and Design by Johan Huijsing English | PDF | 2001 | 474 Pages | ISBN : 1441948759 | 29.1 MB Operational Amplifiers - Theory and Design is the first book to present a systematic circuit design of operational amplifiers. Containing state-of-the-art material as well as the essentials, the book is written to appeal to both the experienced practitioner and the less initiated circuit designer. It is shown that the topology of all operational amplifiers can be divided into nine main overall configurations. These configurations range from one gain stage up to four or more gain stages. Many famous designs are evaluated in depth. |
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