"[A] deftly layered mystery about family, friendship, and the struggle to speak up." - Laurie Halse Anderson, bestselling author of Speak and Shout
From acclaimed author Kate Messner comes the powerful story of a young girl with the courage to make her voice heard, set against the backdrop of a summertime mystery.
When Mia moves to Vermont the summer after seventh grade, she's recovering from the broken arm she got falling off a balance beam. And packed away in the moving boxes under her clothes and gymnastics trophies is a secret she'd rather forget.
Mia's change in scenery brings day camp, new friends, and time with her beloved grandmother. But Gram is convinced someone is trying to destroy her cricket farm. Is it sabotage or is Gram's thinking impaired from the stroke she suffered months ago? Mia and her friends set out to investigate, but can they uncover the truth in time to save Gram's farm? And will that discovery empower Mia to confront the secret she's been hiding--and find the courage she never knew she had?
In a compelling story rich with friendship, science, and summer fun, a girl finds her voice while navigating the joys and challenges of growing up.
Dido Twite uncovers a devious plot against the king in this classic children’s adventure set in an alternate Victorian England.
Dido Twite, a roving ambassador to the King of England, is on her way home to London when her friend Captain Hughes is injured in a stagecoach accident. When Dido seeks help, she encounters the odd inhabitants of Tegleaze Manor: strange old Lady Tegleaze, her nephew, Tobit, and his wizened, witchy nurse, Sannie. Soon suspicious things happen.
A priceless miniature is stolen. Tobit is framed and then kidnapped. A twin sister is found. And when Dido catches a glimpse of her rascally father in Petworth, she is sure she’s in the midst of another Hanoverian plot. Can she get to London to warn the king and save St. Paul's Cathedral from sliding into the Thames?
The Cuckoo Tree is the sixth book in the award-winning Wolves Chronicles, but you may enjoy reading the series in any order.
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.
Journey Home is the story of Tamara Woodson, who lives in the American West in the 1880s. She is smart and sassy, and has a mind of her own. Like many black families of that era following slavery, her family traveled west and founded their own town. Tamara Woodson is at a turning point in her life. She begins a journey of self-discovery that reveals important connections to her ancestral past. Prompted by her ambitions and experiences, she prepares herself for an uncertain future. At one point, Tamara’s fears are expressed in a dream that intertwines a Nigerian Yoruba folktale. She learns to interpret important symbols. At another, Tamara learns about the Apache Indian culture from a girl who is preparing for her own elaborate coming of age ceremony. Exposure to these two cultures helps Tamara validate the values and traditions of others as well as her own. As she matures, Tamara learns to let go of her own fears and to rely on her inner strength. Journey Home is book one in the juvenile historical fiction series, “Passage to Womanhood.”
The fairy-tale detectives must fight magic with magic to rescue their parents in the third book of the New York Times–bestselling children’s series.
For Sabrina and Daphne Grimm, the latest in a long line of fairy-tale detectives, there is one mystery they want to solve above all others: Who kidnapped their parents? When Sabrina finds the secret hideaway of the Scarlet Hand, the sinister group of Everafters who are holding her parents captive, she finally has a chance to rescue their mom and dad.
But to do it, she must defeat the most famous fairy-tale character in the world. With the help of her little sister (who is a lot tougher than Sabrina realizes) and a long-lost relative, Sabrina finds a powerful weapon…but discovers that magic comes at a high price.
Reissued with new cover art, these anniversary editions of the beloved Sisters Grimm series are the perfect opportunity for old fans to revisit the Grimm family’s adventures and for new readers to discover the magic of the series.
Rachel and Alice are an extremely rare form of identical twins--so identical that even their aunt and uncle, whom they've lived with since their parents passed away when the girls were nine, can't tell them apart. The sisters are connected by an intense bond that goes way beyond their surfaces and borders on the supernatural: when one experiences pain, the other exhibits the exact same signs of stress, too. So when troubled Alice disappears mysteriously one night, good-girl Rachel knows something is wrong-especially when Rachel starts experiencing serious physical traumas, even though nobody has touched her.
What Rachel can't tell anyone is that she and Alice sometimes switched places, reveling in the possibility of being the "good one" or the "bad one" for a day. And that Rachel . . . is really Alice, continuing to masquerade as her twin. So then, what happened to her sister? Could whoever abducted her sister really have meant to take her, instead? And can she find the real Rachel before it's too late for both of them?
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