Otros libros que te pueden interesar

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  Speed Speed Centipede! -...

  Michael Dahl

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  Introduces counting by tens by counting the number of feet that a centipede travels.

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  George Washington

  Grace Norwich, Anthony VanArsdale

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  Get to know the humble Revolutionary War general who became the first U.S. President! 
   
  They said I was a leader, brave, honest, fearless, and just. My thoughts of myself were much more modest. Some Americans wanted to make me a king instead of a president. I refused because I knew that the strength of the United States and the value of liberty were more powerful than any one person—even me. I am George Washington. 
   
  Celebrated war hero George Washington used his progressive ideals to become the first President of the United States, earning the nickname “Father of his Country.” Young readers will be inspired by Washington’s heroic journey to make America a better place in this biography featuring: illustrations throughouta timelinean introduction to the other people you’ll meet in the book, including Helen’s amazing teacher and the men who fell in love with hermapssidebarsa top ten list of important things to know, and more

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  The Unofficial Heroes of Olympus...

  Natalie Buczynsky, Richard...

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  “A useful and entertaining guide . . . can be enjoyed by any reader with an interest in mythology, whether they have read The Heroes of Olympus or not.” —Blogcritics 
   
  In the ancient world, the gods and their heroic half-blood children were legendary. Now in the modern world, they regain their glory in the pages of Rick Riordan’s captivating novels. Providing everything you’ll need to become a Hero of Olympus, the book looks back at the stories of Percy Jackson while exploring how Riordan hints at but keeps readers guessing what’s in store for Jason, Piper and Leo. 
   
  In this handy companion, the Olympic gods are fully detailed, from origin and family relationships to famous tales and an expressive illustration, including: 
   
  Zeus • Hera • Poseidon • Athena • Apollo • Aphrodite 
   
  The vast array of other gods and fantastical creatures are also cataloged:Atlas—who literally carries the weight of the world on his shouldersKronos—a Titan who swallows his newborn childrenPersephone—a kidnapped goddess who becomes queen of the UnderworldMinotaur—a half-bull, half-man imprisoned in a labyrinthHydra—a poisonous serpent who grows two heads when one is severedSirens—deadly nymphs whose irresistibly beautiful singing lures sailors to their doom 
   
  IMPORTANT NOTE TO READERS: This book is an independent and unauthorized fan publication.

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  A Ghost in the Window

  Betty Ren Wright

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  A girl’s scary dream may come true in this “fast moving” story starring “a likable and believable heroine” (School Library Journal). Meg’s nightmare about a thin, gray-haired man who beckons her to follow him through a dark doorway will no doubt come true. That’s the way it is with all of her “real” dreams, the ones that her grandmother calls “a secret window into the future.”   Meg suspects that her dream is about sixteen-year-old Caleb Larsen’s father, who died in a car crash after allegedly stealing $50,000 from a local bank. Could Mr. Larsen be trying to reach Caleb and his mother through Meg’s dreams? Is he trying to reveal the truth about what happened? As Meg’s nightmare begins to come true, she learns to cope with her own past as well as Caleb’s, and to see the present in a different, more positive light.

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  Gilbert Filbert and his big MAD box

  Ian Gilbert

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  Gilbert Filbert and His Big MAD Box, by Ian Gilbert and Andy Gilbert, is the story of one boy's desire to make a difference and help his mother find her smile again. It is a book about a boy, a box and a battle for a penguin but, more than that, it is a tale about families, hope and how to make dreams come true. When Gilbert's school project challenges him to 'make a difference', grandma introduces him to the mysterious big MAD box. Each of the sides helps Gilbert to focus on a different aspect of the challenge: setting a goal, identifying the reasons behind the goal, developing self-belief, possibility thinking, making a plan and taking action. Finally, Gilbert learns to appreciate what's inside and celebrate his unique qualities and attributes, which have helped him to succeed at his challenge. As grandma tells Gilbert, any problem is really an opportunity in a hat. The story is deliberately split into short chapters, each relating to a step in the thinking process. The resources provided mean readers can plan to make a difference of their own and develop their possibility thinking. Drawing on proven thinking and success strategies used by leading businesses and organisations, this entertaining, accessible and humorous book is designed to show young people the power of having a goal, having a plan and making a difference. A goal without a plan, they say, is just a wish. This book has been written especially for young people to show them how to set about turning wishes into reality by applying the sorts of planning tools usually only found in big business. The powerful set of thinking tools included in this book will help young people to develop habits of mind that will last a lifetime. The book can be read on a number of levels: as an amusing story, as a method for developing young people's own thinking processes, as a tool for engaging groups of young people in their thinking, or all three. The book also includes a Gilbert Filbert big MAD box which you can cut out, or download and print, together with a finger questions sheet (this will make sense once you have read the book!). Suitable for young people (aged 11+) to use on their own thinking adventures. Also suitable for parents, teachers or anyone working with teenagers who wants to join in the journey.

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  Electrical Machines - Lecture...

  Dr. Hidaia Mahmood Alassoulii

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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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