John Josselyn, Colonial Traveler

John Josselyn, Colonial Traveler

Author: John Josselyn

Publisher:

Published: 1988

Total Pages: 0

ISBN-13: 9780874515435

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A new edition of an unusual description of 17th-century New England flora & fauna, folklore, & the Indian & Puritan cultures of that time.


Inventing Eden

Inventing Eden

Author: Zachary McLeod Hutchins

Publisher:

Published: 2014

Total Pages: 340

ISBN-13: 0199998140

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As Christopher Columbus surveyed lush New World landscapes, he eventually concluded that he had rediscovered the biblical garden from which God expelled Adam and Eve. Reading the paradisiacal rhetoric of Columbus, John Smith, and other explorers, English immigrants sailed for North America full of hope. However, the rocky soil and cold winters of New England quickly persuaded Puritan and Quaker colonists to convert their search for a physical paradise into a quest for Eden's less tangible perfections: temperate physiologies, intellectual enlightenment, linguistic purity, and harmonious social relations. Scholars have long acknowledged explorers' willingness to characterize the North American terrain in edenic terms, but Inventing Eden pushes beyond this geographical optimism to uncover the influence of Genesis on the iconic artifacts, traditions, and social movements that shaped seventeenth- and eighteenth-century American culture. Harvard Yard, the Bay Psalm Book, and the Quaker use of antiquated pronouns like thee and thou: these are products of a seventeenth-century desire for Eden. So, too, are the evangelical emphasis of the Great Awakening, the doctrine of natural law popularized by the Declaration of Independence, and the first United States judicial decision abolishing slavery. From public nudity to Freemasonry, a belief in Eden affected every sphere of public life in colonial New England and, eventually, the new nation. Spanning two centuries and surveying the work of English and colonial thinkers from William Shakespeare and John Milton to Anne Hutchinson and Benjamin Franklin, Inventing Eden is the history of an idea that shaped American literature, identity, and culture.


Reinforcement Learning and Dynamic Programming Using Function Approximators

Reinforcement Learning and Dynamic Programming Using Function Approximators

Author: Lucian Busoniu

Publisher: CRC Press

Published: 2017-07-28

Total Pages: 280

ISBN-13: 1439821097

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From household appliances to applications in robotics, engineered systems involving complex dynamics can only be as effective as the algorithms that control them. While Dynamic Programming (DP) has provided researchers with a way to optimally solve decision and control problems involving complex dynamic systems, its practical value was limited by algorithms that lacked the capacity to scale up to realistic problems. However, in recent years, dramatic developments in Reinforcement Learning (RL), the model-free counterpart of DP, changed our understanding of what is possible. Those developments led to the creation of reliable methods that can be applied even when a mathematical model of the system is unavailable, allowing researchers to solve challenging control problems in engineering, as well as in a variety of other disciplines, including economics, medicine, and artificial intelligence. Reinforcement Learning and Dynamic Programming Using Function Approximators provides a comprehensive and unparalleled exploration of the field of RL and DP. With a focus on continuous-variable problems, this seminal text details essential developments that have substantially altered the field over the past decade. In its pages, pioneering experts provide a concise introduction to classical RL and DP, followed by an extensive presentation of the state-of-the-art and novel methods in RL and DP with approximation. Combining algorithm development with theoretical guarantees, they elaborate on their work with illustrative examples and insightful comparisons. Three individual chapters are dedicated to representative algorithms from each of the major classes of techniques: value iteration, policy iteration, and policy search. The features and performance of these algorithms are highlighted in extensive experimental studies on a range of control applications. The recent development of applications involving complex systems has led to a surge of interest in RL and DP methods and the subsequent need for a quality resource on the subject. For graduate students and others new to the field, this book offers a thorough introduction to both the basics and emerging methods. And for those researchers and practitioners working in the fields of optimal and adaptive control, machine learning, artificial intelligence, and operations research, this resource offers a combination of practical algorithms, theoretical analysis, and comprehensive examples that they will be able to adapt and apply to their own work. Access the authors' website at www.dcsc.tudelft.nl/rlbook/ for additional material, including computer code used in the studies and information concerning new developments.


A Comparative Analysis of the Performance of Long-range Hypervelocity Vehicles

A Comparative Analysis of the Performance of Long-range Hypervelocity Vehicles

Author: Alfred J. Eggers

Publisher:

Published: 1957

Total Pages: 74

ISBN-13:

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The ballistic vehicle is found to be the least efficient of the several types studied in the sense that it generally requires the highest velocity at the end of powered flight in order to attain a given range. This disadvantage may be offset, however, by reducing convective heat transfer to the re-entry body through the artifice of increasing pressure drag in relation to friction drag - that is, by using a blunt body. Thus the kinetic energy required by the vehicle at the end of powered flight may be reduced by minimizing the mass of coolant material involved.


Cajal's Neuronal Forest

Cajal's Neuronal Forest

Author: Javier DeFelipe

Publisher: Oxford University Press

Published: 2018

Total Pages: 513

ISBN-13: 0190842830

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This collection contains hundreds of beautiful rarely-seen-before figures produced throughout the nineteenth century and the beginning of the twentieth century by famed father-of-modern-neuroscience Santiago Ramón y Cajal (1852-1934) and his contemporaries. Cajal was captivated by the beautiful shapes of the cells of the nervous system. He and his fellow scientists saw neurons as trees and glial cells as bushes. Given their high density and arrangement, neurons and glial resembled a thick forest, a seemingly impenetrable terrain of interacting cells mediating cognition and behavior.


Optimal Space Trajectories

Optimal Space Trajectories

Author: Jean-Pierre Marec

Publisher: Elsevier

Published: 2012-12-02

Total Pages: 356

ISBN-13: 0444601074

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Studies in Astronautics, Volume 1: Optimal Space Trajectories focuses on the concept of optimal transfer and the problem of optimal space trajectories. It examines the relative performances of the various propulsion systems (classical and electrical propulsions) and their optimization (optimal mass breakdown), along with parametric and functional optimizations and optimal transfers in an arbitrary, uniform, and central gravitational field. Organized into 13 chapters, this volume begins with an overview of optimal transfer and the modeling of propulsion systems. It then discusses the Hohmann transfer, the Hoelker and Silber bi-elliptical transfer, and the deficiencies of parametric optimization. The book explains the canonical transformation, optimization of the thrust law using the Maximum Principle, and optimal orbit corrections. The time-free orbital transfers and time-fixed orbital transfers and rendezvous are also discussed. Moreover, this volume explains the classical high-thrust and electric low-thrust propulsion systems and rendezvous between two planets. This book is written primarily for engineers who specialize in aerospace mechanics and want to pursue a career in the space industry or space research. It also introduces students to the different aspects of the problem of optimal space trajectories.