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Author: Bruce Koscielniak
Publisher: Houghton Mifflin Harcourt
ISBN: 0618396683
Category : Time
Languages : en
Pages : 49
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Book Description
Publisher Description
Author: Bruce Koscielniak
Publisher: Houghton Mifflin Harcourt
ISBN: 0618396683
Category : Time
Languages : en
Pages : 49
Get Book Here
Book Description
Publisher Description
Author: Chang Jessica
Publisher: Springer Nature
ISBN: 3031017978
Category : Mathematics
Languages : en
Pages : 68
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Book Description
In the history of modern computation, large mechanical calculators preceded computers. A person would sit there punching keys according to a procedure and a number would eventually appear. Once calculators became fast enough, it became obvious that the critical path was the punching rather than the calculation itself. That is what made the stored program concept vital to further progress. Once the instructions were stored in the machine, the entire computation could run at the speed of the machine. This book shows how to do the same thing for DNA computing. Rather than asking a robot or a person to pour in specific strands at different times in order to cause a DNA computation to occur (by analogy to a person punching numbers and operations into a mechanical calculator), the DNA instructions are stored within the solution and guide the entire computation. We show how to store straight line programs, conditionals, loops, and a rudimentary form of subroutines. To achieve this goal, the book proposes a complete language for describing the intrinsic topology of DNA complexes and nanomachines, along with the dynamics of such a system. We then describe dynamic behavior using a set of basic transitions, which operate on a small neighborhood within a complex in a well-defined way. These transitions can be formalized as purely syntactical functions of the string representations. Building on that foundation, the book proposes a novel machine motif which constitutes an instruction stack, allowing for the clocked release of an arbitrary sequence of DNA instruction or data strands. The clock mechanism is built of special strands of DNA called ""tick"" and ""tock."" Each time a ""tick"" and ""tock"" enter a DNA solution, a strand is released from an instruction stack (by analogy to the way in which as a clock cycle in an electronic computer causes a new instruction to enter a processing unit). As long as there remain strands on the stack, the next cycle will release a new instruction strand. Regardless of the actual strand or component to be released at any particular clock step, the ""tick"" and ""tock"" fuel strands remain the same, thus shifting the burden of work away from the end user of a machine and easing operation. Pre-loaded stacks enable the concept of a stored program to be realized as a physical DNA mechanism. A conceptual example is given of such a stack operating a walker device. The stack allows for a user to operate such a clocked walker by means of simple repetition of adding two fuel types, in contrast to the previous mechanism of adding a unique fuel -- at least 12 different types of strands -- for each step of the mechanism. We demonstrate by a series of experiments conducted in Ned Seeman's lab that it is possible to ""initialize"" a clocked stored program DNA machine. We end the book with a discussion of the design features of a programming language for clocked DNA programming. There is a lot left to do. Table of Contents: Introduction / Notation / A Topological Description of DNA Computing / Machines and Motifs / Experiment: Storing Clocked Programs in DNA / A Clocked DNA Programming Language
Author: Pat Hutchins
Publisher: Simon and Schuster
ISBN: 1481410725
Category : Juvenile Fiction
Languages : en
Pages : 32
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Book Description
When the hall clock reads twenty minutes past four, the attic clock reads twenty-three minutes past four, the kitchen clock reads twenty-five minutes past four, and the bedroom clock reads twenty-six minutes past four, what should Mr. Higgins do? He can't tell which of his clocks tells the right time. He is in for a real surprise when the Clockmaker shows him that they are all correct!
Author: James Thurber
Publisher: NYRB Kids
ISBN: 9781590179376
Category : Children's stories
Languages : en
Pages : 0
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Book Description
In a cold, gloomy castle where all the clocks have stopped, a wicked Duke amuses himself by finding new and fiendish ways of rejecting the suitors for his niece, the good and beautiful Princess Saralinda.
Author: David Rooney
Publisher: National Geographic Books
ISBN: 1324021950
Category : History
Languages : en
Pages : 0
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Book Description
One of Smithsonian Magazine's Ten Best History Books of 2021 A captivating, surprising history of timekeeping and how it has shaped our world. For thousands of years, people of all cultures have made and used clocks, from the city sundials of ancient Rome to the medieval water clocks of imperial China, hourglasses fomenting revolution in the Middle Ages, the Stock Exchange clock of Amsterdam in 1611, Enlightenment observatories in India, and the high-precision clocks circling the Earth on a fleet of GPS satellites that have been launched since 1978. Clocks have helped us navigate the world and build empires, and have even taken us to the brink of destruction. Elites have used them to wield power, make money, govern citizens, and control lives—and sometimes the people have used them to fight back. Through the stories of twelve clocks, About Time brings pivotal moments from the past vividly to life. Historian and lifelong clock enthusiast David Rooney takes us from the unveiling of al-Jazari’s castle clock in 1206, in present-day Turkey; to the Cape of Good Hope observatory at the southern tip of Africa, where nineteenth-century British government astronomers moved the gears of empire with a time ball and a gun; to the burial of a plutonium clock now sealed beneath a public park in Osaka, where it will keep time for 5,000 years. Rooney shows, through these artifacts, how time has been imagined, politicized, and weaponized over the centuries—and how it might bring peace. Ultimately, he writes, the technical history of horology is only the start of the story. A history of clocks is a history of civilization.
Author: Derek Roberts
Publisher: Schiffer Pub Limited
ISBN: 9780764320217
Category : Antiques & Collectibles
Languages : en
Pages : 288
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Book Description
This volume chronicles the horological work carried out in France, Germany, and North America and completes the fascinating history of precision timekeeping in recent time. Over 500 beautiful color and black-and-white photographs illustrate the historical contributions of renowned clockmakers from France and Germany. America's contribution to precision timekeeping is chronicled along with recent advancements in precision pendulum timekeeping.
Author: Vojin G. Oklobdzija
Publisher: John Wiley & Sons
ISBN: 0471723681
Category : Technology & Engineering
Languages : en
Pages : 265
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Book Description
Provides the only up-to-date source on the most recent advances in this often complex and fascinating topic. The only book to be entirely devoted to clocking Clocking has become one of the most important topics in the field of digital system design A "must have" book for advanced circuit engineers
Author: Geoff McNamara
Publisher: Springer Science & Business Media
ISBN: 038776562X
Category : Science
Languages : en
Pages : 192
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Book Description
Pulsars are rapidly spinning neutron stars, the collapsed cores of once massive stars that ended their lives as supernova explosions. In this book, Geoff McNamara explores the history, subsequent discovery and contemporary research into pulsar astronomy. The story of pulsars is brought right up to date with the announcement in 2006 of a new breed of pulsar, Rotating Radio Transients (RRATs), which emit short bursts of radio signals separated by long pauses. These may outnumber conventional radio pulsars by a ratio of four to one. Geoff McNamara ends by pointing out that, despite the enormous success of pulsar research in the second half of the twentieth century, the real discoveries are yet to be made including, perhaps, the detection of the hypothetical pulsar black hole binary system by the proposed Square Kilometre Array - the largest single radio telescope in the world.
Author: Rudy Nydegger
Publisher: Bloomsbury Publishing USA
ISBN: 1440850046
Category : Psychology
Languages : en
Pages : 217
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Book Description
Covering important topics such as job satisfaction, workplace stress, and the changing nature of jobs and careers in the 21st century, this valuable resource explores how working affects us psychologically, for better and for worse and sometimes in imperceptible ways. Although most people go to work Monday through Friday, few stop to think about the central role work plays in our lives. Besides allowing us to provide for the material needs of ourselves and our families, having a job or career can help us to meet new people and stay socially connected, to increase our self-esteem and sense of self-worth, and to allow us to have an impact on the world. But work can also leave us exhausted and stressed, and many people find it difficult to balance their work and personal lives. This clear and accessibly written book in Greenwood's Psychology of Everyday Life series provides readers with an understanding of the important roles work plays in our lives, the many forms work may take, and the ways in which our relationships with work change throughout our lives. The information, presented in an unassuming, easy-to-understand manner, is drawn from classical theory as well as from contemporary research, affording readers a well-rounded understanding of the topic. The book also includes a collection of real-world scenarios to illustrate key concepts as well as scholarly essays offering perspective on current issues and debates related to work in America.
Author: Karen Pinkus
Publisher: U of Minnesota Press
ISBN: 1452962375
Category : Performing Arts
Languages : en
Pages : 126
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Book Description
An original reflection on Italy’s postwar boom considers potentials for resistance in today’s neoliberal (dis)order What can 1960s Italian cinema teach us about how to live and work today? Clocking Out challenges readers to think about labor, cinema, and machines as they are intertwined in complex ways in Italian cinema of the early ’60s. Drawing on critical theory and archival research, this book asks what kinds of fractures we might exploit for living otherwise, for resisting traditional narratives, and for anticapitalism. Italy in the 1960s was a place where the mass-producing factory was the primary mode of understanding what it meant to work, but it was also a time when things might have gone another way. This thinking and living differently appears in the cracks, lapses, or moments of film. Clocking Out is organized into scenes from an obscure 1962 Italian comedy (Renzo e Luciana, from Boccaccio 70). Reconsidering the origins of paradigms such as clocking in and out, “society is a factory,” and the gendered division of labor, Karen Pinkus challenges readers to think through cinema, enabling us to see gaps and breakdowns in the postwar order. She focuses on the Olivetti typewriter company and a little-known film from an Italian anthology movie, thinking with cinema about the power of the Autonomia movement, the refusal to work, and the questions of wages, paternalism, and sexual difference. Alternating microscopic attention to details and zooming outward, Pinkus examines rituals of production, automation, repetition, and fractures in a narrative of labor that begins in the 1960s and extends to the present—the age of the precariat, right-wing resentment, and nostalgia for an order that was probably never was.
