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  The Winter Room

  Gary Paulsen

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  A Newbery Honor Book by the New York Times–bestselling author of Northwind. “A compelling description of farming in a bygone time.” —Publishers Weekly 
   
  ALA/YALSA Best Book for Young Adults 
   
  ALA Notable Book for Children 
   
  Judy Lopez Memorial Award for Children’s Literature 
   
  Following the turn of the seasons, eleven-year-old Eldon traces the daily routines of his life on a farm and his relationship with his older brother Wayne. During the winter, with little work to be done on the farm, Eldon and Wayne spend the quiet hours with their family, listening to their Uncle David’s stories. But Eldon soon learns that, although he has lived on the same farm, in the same house with his uncle for eleven springs, summers, and winters, he hardly knows him. 
   
  “It is the palpable awareness of place and character that is unforgettable. Paulsen, with a simple intensity, brings to consciousness the texture, the smells, the light and shadows of each distinct season. He has penned a mood poem in prose.” —School Library Journal 
   
  “More a prose poem than a novel, this beautifully written evocation of a Minnesota farm perhaps 40 years ago consists of portraits of each of the four seasons, along with four brief stories told by old Uncle David.” —Kirkus Reviews

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  Electrical Machines - Lecture...

  Dr. Hidaia Mahmood Alassouli

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  This book includes my lecture notes for electrical machines course. The book is divided to different learning partsPart 1- Apply basic physical concepts to explain the operation and solve problems related to electrical machines.Part 2- Explain the principles underlying the performance of three-phase electrical machines.Part 3- Analyse, operate and test three-phase induction machines.Part 4- Investigate the performance, design, operation, and testing of the three-phase synchronous machine.Part1:  Apply basic physical concepts to explain the operation and solve problems related to electrical machines.Describe the construction of simple magnetic circuits, both with and without an air gap. Explain the basic laws which govern the electrical machine operation, such as Faraday's Law, Ampere-Biot-Savart's Law, and Lenz's Law. Apply Faraday's Law of electromagnetic induction, Ampere-Biot-Savart's Law, and Lenz's Law to solve for induced voltage and currents in relation to simple magnetic circuits with movable parts. Illustrate the principle of the electromechanical energy conversion in magnetic circuits with movable parts.Part 2: Explain the principles underlying the performance of three-phase electrical machines. Compare and contrast concentric and distributed windings in three-phase electrical machines. Identify the advantages of distributed windings applied to three-phase machines. Explain how the pulsating and rotating magnetic fields are produced in distributed windings. Calculate the synchronous speed of a machine based on its number of poles and frequency of the supply. Describe the process of torque production in multi-phase machines.Part 3: Analyse, operate and test three-phase induction machines. Calculate the slip of an induction machine given the operating and synchronous speeds. Calculate and compare between different torques of a three-phase induction machine, such as the locked rotor or starting torque, pull-up torque, breakdown torque, full-load torque or braking torque. Develop and manipulate the equivalent circuit model for the three-phase induction machine. Analyse, and test experimentally, the torque-speed and current-speed characteristics of induction machines. and discuss the effects of varying such motor parameters as rotor resistance, supply voltage and supply frequency on motor torque-speed characteristics. Perform no-load and blocked rotor tests in order to determine the equivalent circuit parameters of an induction machine. Explore various techniques to start an induction motor. Identify the applications of the three-phase induction machines in industry and utility. Classify the insulations implemented in electrical machines windings and identify the factors affecting them.        Part4. Investigate the performance, design, operation, and testing of the three-phase synchronous machine. Describe the construction of three-phase synchronous machines, particularly the rotor, stator windings and the rotor saliency. Develop and manipulate an equivalent circuit model for the three-phase synchronous machine. Sketch the phasor diagram of a non-salient poles synchronous machine operating at various modes operation, such as no-load operation, motor operation, and generator operation. Investigate the influence of the rotor saliency on machine performance. Perform open and short circuit tests in order to determine the equivalent circuit parameters of a synchronous machine. Identify the applications of the three-phase synchronous machines in industry and utility List and explain the conditions of parallel operation of a group of synchronous generators. Evaluate the performance of the synchronous condenser and describe the power flow control between a synchronous condenser and the utility in both modes: over and under excited. Explain the principles of controlling the output voltage and frequency of a synchronous generator.

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  The Accidental Adventures of...

  Jason Byrne

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  The Accidental Adventures of Onion O'Brien is the deadly debut from Ireland's Got Talent's Jason Byrne!Meet Onion O'Brien. He's an ordinary kid growing up in the suburbs where nothing ever happens. Except when it does, it always happens to him.Luckily, his friends have his back.There's Sive O'Connor, Dallan Okoye, Cliona O'Hare and Onion's big brother, Derek (who thinks he's too cool to be in the gang). Together they're the Five O's.The circus has come to Ballinlud and Onion's grandad got free tickets for the whole gang! But the evening turns out to be more eventful than planned when a baby ape escapes and ends up in Onion's back garden.Can the Five O's save the ape from the evil ringmaster and keep her hidden in suburbia long enough to get her safely to Tota Freedom Wildlife Park?

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  Know-It-Alls! Dinosaurs

  Jay Johnson

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  As part of the unique, science Know-It-Alls! Series that features stunning covers and engaging text, this book puts the spotlight on Dinosaurs! Did you know that Tyrannosaurus was the fiercest meat-eating dinosaur? It wasn't the biggest, but it was huge—7 tons (6.5 metric tons) of charging monster. At over 40 feet (12 m) long, it was a smart killer with sharp eyesight. Learn all about these prehistoric creatures and the paleontologists that study them. Awesome life-like illustrations and informative stat boxes, filled with interesting facts, make this 24-page book fun and exciting for young science enthusiasts age 4 and up! Titles in the Know-It-Alls! Series  include: Butterflies, Crocodiles, Dinosaurs, Farm Animals, Safari Babies, Snakes, Sharks, Spiders, Whales, Wolves, Puppies, Wild Cats, Bugs, Birds of Prey, Fish, Frogs, Apes, Seals, Bats, Bears, Predators, Mummies, Volcanoes, Lizards, Kittens and Horses.

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  The Worst-Case Scenario Ultimate...

  Bill Doyle, David Borgenicht,...

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  In this illustrated interactive adventure, travel to Mount Everest where you decide the fate of your team as you climb the world’s highest mountain. On this epic climb up Mount Everest, readers are part of the youngest team ever to climb the world’s tallest peak. Only YOU can make the right choice about your own survival and then experience the consequences of those choices. Will you summit Mount Everest and return to base camp safely? Will you be forced to turn back early or worse? Only you can determine your own fate!  Highly illustrated in comic book style, and based on real, true-life facts about mountain climbing, Mount Everest, and Himalayan culture, this book will be a surefire hit with anyone craving adventure and a fun, visual reading experience.

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  A Dream of Pilots

  Philip Handleman

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  "An evocative and insightful look at the history of flight written from the perspective of the history-makers themselves." --Dr. Richard P. Hallion, Verville Fellow, Smithsonian InstitutionPresenting the lives of more than twenty aviation luminaries from throughout history, this middle reader is a captivating celebration of man's aspirations for the skies. From the story of the Wright brothers to that of Alan Shepard, Jr., the author, himself an experienced pilot, introduces young readers to the history of modern flight and the inspiring figures who followed their dreams to navigate over vast oceans, set altitude and speed records, pioneer stunt techniques, and eventually rocket into the great abyss of space.Both children and adult readers learn about Roscoe Turner, air racer and showman, who started by flying stunts in the movie Hell's Angels and went on to clock an average speed of 283.4 miles per hour, a new record of his time. Igor Sikorsky from Russia made his first helicopter at age twelve with a rubber band, but by the time he was an adult, he had created the Sikorsky XR-4, the army's first practical helicopter.

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