موضوعات
آموزش و پرورش
ادبیات و زبان
پزشکی، دندانپزشکی و داروسازی
تاریخ و جغرافیا
داستان و رمان
دیگر
دین و فلسفه
روانشناسی
ریاضیات و آمار
سلامتی، تناسب اندام و رژیم غذایی
شیمی و پلیمر
علوم اجتماعی و حقوق
علوم زیستی و بیوتکنولوژی
فیزیک و نجوم
کامپیوتر و اینترنت
کتابهای کودکان و داستان
کسب و کار و اقتصاد
کشاورزی و دامپزشکی و غذا
معماری
مهندسی و فناوری
هنر و تئاتر
محصولات
Don't Know Much About the Universe: Everything You Need to Know About Outer Space but Never Learned (Don't Know Much About...) - PDF
نویسندگان: خلاصه: Who dug those canals on Mars? What was the biblical Star of Bethlehem? Were the pyramids built by extraterrestrials? From the ancients who charted the heavens to Star Trek, The X-Files, and Apollo 13, outer space has intrigued people through the ages. Yet most of us look up at the night sky and feel totally in the dark when it comes to the basic facts about the universe. Kenneth C. Davis steps into that void with a lively and readable guide to the discoveries, theories, and real people who have shed light on the mysteries and wonders of the cosmos. Discover why Einstein was such a genius, the truth behind a blue moon or two, the amazing secrets of Stonehenge, and even how one great astronomer lost his nose. With the fun question-and-answer format that has appealed to the millions of readers of his bestselling Don't Much About® series, you'll be taking off on an exciting armchair exploration of the solar system, the Milky Way, and beyond.
Phenomenon: Everything You Need to Know About The Paranormal - PDF
نویسندگان: خلاصه: There’s no slowing down for Sylvia Browne. For nearly fifty years she has been giving countless readers and listeners spiritual advice and psychic predictions. Browne offers her fans a complete guide to all things unexplainable. In Phenomenon, an A-to-Z compendium of everything on The Other Side that influence our life here on Earth, Browne provides evocative stories and useful explanations to help make life on The Other Side real for readers. It also features approximately twenty illustrations that will accompany some of the entries, including: -Atlantis—Where did it go and when will it return? -Clairvoyance—How do you know if you have the gift? -D?j? vu—Are past lives the answer to this strange phenomenon? -Ghosts—Who are they? -Miracles—Can they happen every day? -Numerology—How does this affect us? -Reincarnation—Have we lived before? -Sorcery—Is this something we should fear? -Zombies—Are they only in horror movies? An easy-to-use reference full of hope and guidance, Phenomenon is sure to have wide appeal among Browne’s loyal fans and anyone in search of signs of the afterlife.
You Are Here: A Portable History of the Universe - PDF
نویسندگان: خلاصه: You Are Here is a dazzling exploration of the universe and our relationship to it, as seen through the lens of today's most cutting-edge scientific thinking. Christopher Potter brilliantly parses the meaning of what we call the universe. He tells the story of how something evolved from nothing and how something became everything. What does a material description of everything and nothing look like? What is it that science does when it describes a reality that is made out of something? In between nothing and everything is where we live. Here, for the first time in a single span, is the life of the universe, from quarks to galaxy superclusters and from slime to Homo sapiens. The universe was once a moment of perfect symmetry and is now 13.7 billion years of history. Clouds of gas were woven into whatever complexity we find in the universe today: the hierarchies of stars or the brains of mammals. Potter writes entertainingly about the history and philosophy of science, and he shows that science advances by continually removing humankind from a position of primacy in the universe, but the universe responds by placing us back there again. With wisdom and wonder, Potter traverses the cosmos from its conception to its eventual end—while exploring everything in between.
THIS RADICAL LAND - PDF
نویسندگان: خلاصه: Then the coal company came with the world’s largest shovel, And they tortured the timber, and stripped all the land. Well, they dug for their coal till the land was forsaken, And they wrote it all down as the progress of man. John Prine, “Paradise”1 What happens when the past’s oldest witness comes crashing down dead? A new day will dawn . . . but over what? Where are we, who are we, when the bough breaks? Bostonians opened their eyes on a Wednesday morning in 1876 to opaque February skies bleakly blanketing a city made suddenly strange. At 7 p.m. the evening before, the enormous Great Elm on the famous Boston Common had been toppled by a hard wind.2 Of course, trees fall all the time with never a thought spared them, but the Great Elm was dif- ferent. It was famous in the nineteenth-century as an emissary from the past, and it appears ubiquitously in prose, poem, and print, a people’s treasured heirloom, believed to be among the last living witnesses to the young nation’s milestones; its loss was disorienting. Paul Revere, on his 1775 midnight ride, was rumored to have passed by the tree
Discrete Element Modelling of Particulate Media by Chuan-Yu Wu - Original PDF
نویسندگان: خلاصه: In numerical simulations of dense two-phase flow involving particulate materials the Discrete Element Method (DEM) has proved particularly effective in capturing the complex hydrodynamics of the solid phase. 1 DEM-based granular solid dynamics, including collisions and persistent contact with elaborate force-displacement laws, friction and cohesion have shown to be superior to traditional fluid-like, continuum approaches, which typically require coarse approximations and the introduction of artificial variables like solids pressure and viscosity. However, computational limitations of DEM models do not allow adding also the burden of flow simulations resolved at the level of particle-particle interstices, so that typically an averaged scale approach, with computational cell sizes of the order of a few particle diameters, is used. 2 .3 As a consequence, formulations of the drag force acting on individual particles are required to close the set of equations to solve for the solid and fluid phases. While many drag force models for monodisperse systems have been proposed in the literature, as discussed below, expressions for such force on a particle in a multi-particle system is currently the subject of extensive research work
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