How does it happen that billions of stars can cooperate to produce the beautiful spirals that characterize so many galaxies, including ours? This book presents a theory of spiral structure that has been developed over the past three decades under the continuous stimulus of new observational studies. The theory unfolds in a way that can be grasped by any reader with an undergraduate science background who is interested in astronomy, as well as by graduate students and scientists actively involved in astronomy or related subjects who want to see the "backbone" and the physical content of the theory. The foundations of this theoretical framework were laid in the early 1960s, following the pioneering work of B. Lindblad. C. C. Lin had already contributed significantly to the field of fluid mechanics when he turned his attention to spiral structures, and he has focused on the problem ever since. Giuseppe Bertin joined this research effort when he first visited at MIT in 1975, bringing to the project knowledge from his work on elliptical galaxies and plasma astrophysics. Together, Bertin and Lin have contributed to the exciting developments on spiral structure of the last few decades, working closely with many observers and other theorists. In this book they describe the density-wave theory with the goal of making the key concepts and astrophysical implications explicit and accessible. The essence of the solution Bertin and Lin present is that the spirals are wave rather than material phenomena and generally trace intrinsic characteristics of the individual galaxies. The book is in three parts--Physical Concepts, Observational Studies, and Dynamical Mechanisms--with most of the technical details confined to the last part.

This book uses the spiral shape as a key to a multitude of strange and seemingly disparate stories about art, nature, science, mathematics, and the human endeavour. In a way, the book is itself organized as a spiral, with almost disconnected chapters circling around and closing in on the common theme. A particular strength of the book is its extremely cross-disciplinary nature - everything is fun, and everything is connected! At the same time, the author puts great emphasis on mathematical and scientific correctness, in contrast, perhaps, with some earlier books on spirals. Subjects include the mathematical properties of spirals, sea shells, sun flowers, Greek architecture, air ships, the history of mathematics, spiral galaxies, the anatomy of the human hand, the art of prehistoric Europe, Alfred Hitchcock, and spider webs, to name a few.

The Spiral After-Effect discusses the spiral after-effect of apparent movement. It aims to bring a body of research literature into some compact form for the convenience of students and clinicians in particular, and experimentalists in general. It seeks to outline the main areas of interest in the study of this intriguing illusion and to examine the influence of selected psychophysical, program, and subject factors on its incidence and duration. It also provides a few suggestions for future research. The book begins with an introduction and historical review of studies on the after-effect of apparent movement. Separate chapters then cover stimulus variables and their influence on the incidence and duration of the after-effect; program variables relevant to the incidence and duration of the illusion; the influence of selected observer variables on the incidence and duration of the after-effect; and theoretical explanations of the after-effect. The appendix provides an abstract of the main experiments, findings, and conclusions of the pre-eminent figure in the field of motion aftereffects Dr. G. A. Wohlgemuth who, working between 1905 and 1909, brought together the existing literature up to the period and summarized what was largely nineteenth-century work.

From the tiny twisted biological molecules to the gargantuan curling arms of many galaxies, the physical world contains a startling repetition of spiral patterns. Today, researchers have a keen interest in identifying, measuring, and defining these patterns in scientific terms. Spirals play an important role in the growth processes of many biological forms and organisms. Also, through time, humans have imitated spiral motifs in their art forms, and invented new and unusual spirals which have no counterparts in the natural world. Therefore, one goal of this multiauthored book is to stress the conspicuous role that spirals play in science, and to show the reader how to create such spirals using a computer. Another goal is to show how simple mathematical formulas can reveal magnificent shapes and images. This interdisciplinary book revolves around a common theme, spiral symmetry, and is intended for scientists, humanists, and interested laypeople.

Noelle-Newmann's classic on public opinion as a form of social control was originally published in German in 1980 and first published in English in 1984. This revised edition adds three new chapters to summarize ongoing research, new findings, and new developments. Annotation copyright by Book News, Inc., Portland, OR

Inspirational stories of engaging, real-life educational experiences Everyone has a personal learning story, a time when they became actively engaged in their own education. Maybe it was an especially challenging teacher, or a uniquely supportive environment, or a collaborative classroom. In Faces of Learning, both well-known public figures, such as Arne Duncan and Al Franken, and ordinary Americans recall the moments when they truly learned something. Includes stories from people of all different backgrounds and from all over the country The stories are grouped into categories by theme like "relevant" and "experiential" to help reveal the common characteristics of what works in education Each chapter ends with five things you can do to improve your own learning, that of your students, and of all Americans Readers can visit the companion website www.facesoflearning.net to share their own stories of educational success and find out what else they can do.

The first bio-tech thriller from acclaimed Cornell professor, Paul McEuen, the new Michael Crichton.Pacific Ocean 1946: Liam Connor of the British Army, a global expert on germ warfare, is sent to help the US Navy foil an attempt by a Japanese submarine to unleash the world's first biological super-weapon. Code-name: Uzumaki. Translation: Spiral. The devastating decision is made to annihilate Spiral by releasing the world's fourth atomic bomb, obliterating the weapon before it can release its catastrophic payload.New York, present day: Connor, now a world-renowned Nobel prize-winner working on the cutting edge of nano-science technology, prayed that the spectre of Spiral would never return. But now it is back and the stakes are exponentially higher. Spiral would be virtually unstoppable with current technological advances and only Connor holds the key to its cure. Those who seek Spiral will stop at nothing to obtain Connor's knowledge, even if it means his death and that of everyone he holds dear. As the race begins for Spiral, will the world survive the Doomsday scenario about to unfold?

Spiral Dynamics introduces a new model for plotting the enormous economic and commercial shifts that are making contemporary business practice so complex and apparently fragmented. Focusing on cutting-edge leadership, management systems, processes, procedures, and techniques, the authors synthesize changes such as: Increasing cultural diversity. Powerful new social responsibility initiatives. The arrival of a truly global marketplace. This is an inspiring book for managers, consultants, strategists, and leaders planning for success in the business world in the 21st century.

It is widely recognized that spiral grain in trees severely reduces the value of sawn timber through warping and loss of strength, and that it also causes problems for other wood uses as diverse as transmission poles or plywood. Yet, paradoxically, there are highly valued grain patterns including wavy and interlocked grain, whose origins in the cambium invite direct comparison with those of spiral grain, so that many authorities believe them to be related phenomena. In recent years this concept has prompted extensive research into the anatomy, genetics, and physiology of all such grain patterns in wood. As a result it has become apparent that tree cambia provide excellent systems through which to study the origins of stem polarity and the complex processes of morphogenetic control in plants. Beside these and other pressing topics for research, the book examines methods of measuring grain deviations, and considers their influence on wood properties, on the economics of timber production, and on wood manufacturing.