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Blog Archive

  • Endless Universe Beyond the Big Bang


    Auteur : Paul J. Steinhardt , Neil Turok  Edition: DOUBLEDAY Pages: 135 Format: pdf
    Two world-renowned scientists present an audacious new vision of the cosmos that “steals the thunder from the Big Bang theory
    The Big Bang theory—widely regarded as the leading explanation for the origin of the universe—posits that space and time sprang into being about 14 billion years ago in a hot, expanding fireball of nearly infinite density. Over the last three decades the theory has been repeatedly revised to address such issues as how galaxies and stars first formed and why the expansion of the universe is speeding up today. Furthermore, an explanation has yet to be found for what caused the Big Bang in the first place.
    In Endless Universe, Paul J. Steinhardt and Neil Turok, both distinguished theoretical physicists, present a bold new cosmology. Steinhardt and Turok “contend that what we think of as the moment of creation was simply part of an infinite cycle of titanic collisions between our universe and a parallel world” (Discover). They recount the remarkable developments in astronomy, particle physics, and superstring theory that form the basis for their groundbreaking “Cyclic Universe” theory. According to this theory, the Big Bang was not the beginning of time but the bridge to a past filled with endlessly repeating cycles of evolution, each accompanied by the creation of new matter and the formation of new galaxies, stars, and planets.
    Endless Universe provides answers to longstanding problems with the Big Bang model, while offering a provocative new view of both the past and the future of the cosmos.  It is a “theory that could solve the cosmic mystery”


    Download this book : Endless Universe



  • Machine Devices and Components Illustrated Sourcebook


    Auteur : Robert Parmley  Edition: McGraw-Hill Professional Pages: 428 Format: pdf

    Invaluable to anyone who designs, repairs, or operates machines, this sourcebook contains 2000 illustrations of the most commonly used components found in home appliances, office machines, vehicles, aircraft, ships, construction, factory equipment, and machine tools. The author also includes design formulas and structural data.
    Contents:
    -Ingenious Mechanisms
    -Creative Assemblies
    -Linkages
    -Connections
    -Locking Devices & Methods
    -Gears & Gearing
    -Clutches
    -Chains, Sprockets & Ratchets
    -Belts & Belting
    -Shafts & Couplings
    -Threaded Components
    -Pins
    -Springs
    -Cams
    -Grommets, Spacers & Inserts
    -Washers
    -O-rings
    -Retaining Rings
    -Balls
    -Bushings & Bearings

    Download this book : Machine Devices and Components
  • Gears & Gear Cutting Workshop Practice Series 17

    Auteur: Ivan Law Edition: Trans-Atlantic Publications Pages:69 Format:pdf

    Gears in one form or another are part of most mechanisms, but they are by no means as simple as they may appear. This book explains simply and comprehensively the underlying theory involved, and in its second part, how to cut gears on a lathe or milling machine.