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Design in Nature: How the Constructal Law Governs Evolution in Biology, Physics, Technology, and Social Organizations [Anglais] [Broché]

Adrian Bejan , J. Peder Zane

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Description de l'ouvrage

8 janvier 2013

In this groundbreaking book, Adrian Bejan takes the recurring patterns in nature—trees, tributaries, air passages, neural networks, and lightning bolts—and reveals how a single principle of physics, the constructal law, accounts for the evolution of these and many other designs in our world.
Everything—from biological life to inanimate systems—generates shape and structure and evolves in a sequence of ever-improving designs in order to facilitate flow. River basins, cardiovascular systems, and bolts of lightning are very efficient flow systems to move a current—of water, blood, or electricity. Likewise, the more complex architecture of animals evolve to cover greater distance per unit of useful energy, or increase their flow across the land. Such designs also appear in human organizations, like the hierarchical “flowcharts” or reporting structures in corporations and political bodies. All are governed by the same principle, known as the constructal law, and configure and reconfigure themselves over time to flow more efficiently. Written in an easy style that achieves clarity without sacrificing complexity, Design in Nature is a paradigm-shifting book that will fundamentally transform our understanding of the world around us.

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Discovering a unifying law of design in nature was not on my to-do list when I traveled to Nancy, France, in late September 1995. I was a forty-seven-year-old professor of mechanical engineering at Duke University who had come to deliver a lecture at an international conference on thermodynamics. Giving you a sense of how steeped my career was in mechanical engineering, I remember that I had brought flyers announcing the publication of my seventh book, Entropy Generation Minimization.

My work took a fateful turn during the prebanquet speech delivered by the Belgian Nobel laureate Ilya Prigogine. Echoing the scientific community’s conventional wisdom, this famous man  asserted that the tree-shaped structures that abound  in nature—including river basins and deltas, the air passages in our lungs, and lightning bolts—were aléatoires (the result of throwing the dice). That is, there is nothing underlying their similar design. It’s just a cosmic coincidence.

When he made that statement, something clicked, the penny dropped. I knew that Prigogine, and everyone else, was wrong. They weren’t blind; the similarities among these treelike structures are clear to the naked eye. What they couldn’t see was the scientific principle that governs the design of these diverse phenomena. In a flash, I realized that the world was not formed by random accidents, chance, and fate but that behind the dizzying diversity is a seamless stream of predictable patterns.

As these thoughts began to flow, I started down a long, uncharted, and wondrously exciting path that would allow me to see the world in a new, and better, light. In the sixteen years since, I have shown how a single law of physics shapes the design of all around us. This insight would lead me to challenge many articles of faith held by my scientific colleagues, including the bedrock beliefs that biological creatures like you and me are governed by different principles from the inanimate world of winds and rivers  and the engineered world of airplanes, ships, and automobiles. Over time, I would develop a new understanding of evolutionary phenomena and the oneness of nature that would reveal how design emerges without an intelligent designer. I would also offer a new theory for the history of Earth and what it means to be alive.

In addition, I and a growing number of scientists around the world would begin finding new ways to make life easier: better ways to design roads and transport systems; to predict the evolution of civilization and science, of cities, universities, sports, and the global use of energy. We would unravel the mysteries of Egypt’s Pyramids and the genius of the Eiffel Tower while demonstrating how governments  are designed  like river basins and how businesses are as interdependent as the trees on the forest floor.

All that lay in the future when I boarded the plane for the trip home. High over the Atlantic, I opened my notebook (the old-fashioned kind, with paper) and wrote down the constructal law:
     For a finite-size flow system to persist in time (to live), its configuration must evolve
     in such a way that provides easier access to the currents that flow through it.
I was writing in the language of science, but the fundamental idea is this: Everything that moves,  whether animate or inanimate, is a flow system. All flow systems generate shape and structure in time in order to facilitate this movement across a landscape filled with resistance (for example, friction). The designs we see in nature are not the result of chance. They arise naturally, spontaneously, because they enhance access to flow in time.

Flow systems have two basic features (properties). There is the current that is flowing (for example, fluid, heat, mass, or information) and the design through which it flows. A lightning bolt, for example, is a flow system for discharging  electricity from a cloud. In a flash it creates a brilliant branched structure because this is a very efficient way to move a current (electricity) from a volume (the cloud) to a point (the church steeple or another cloud). A river basin’s evolution produces a similar architecture because  it, too, is moving a current (water) from  an area (the plain) to a point (the river mouth). We also find a treelike structure in the air passages of lungs (a flow system for oxygen), in the capillaries (a flow system for blood), and the dendrites of neurons in our brains  (a flow system for  electrical signals and images). This treelike pattern emerges throughout nature because it is an effective design  for facilitating point-to-area and area-to-point flows. Indeed, wherever you find such flows, you find a treelike structure.

Since human beings are part of nature and governed by its laws, the point-to-area and area-to-point flows we construct also tend to have treelike structures. These include the transportation routes we follow to work (a flow system for moving people and goods), which include many smaller driveways and neighborhood paths flowing into a few larger roads and highways. So, too, do the flowing networks of information, material, employees, and customers that keep those businesses afloat. The engineered world we have built so that we can move more easily does not copy any part of the natural design; it is a manifestation of it. That said, once we know the principle, we can use it to improve our designs.

Although treelike structures are a very common design in nature, they are only one manifestation of the constructal law. In a simple example, logs floating on a lake or icebergs at sea orient themselves perpendicular to the wind in order to facilitate the transfer of motion from  the moving air body to the water body. A more complex example is the design of animals that have evolved to move mass better and better (to cover more distance per unit of useful energy) across the landscape. This includes the seemingly “characteristic” sizes of organs, the shape of bones, the rhythm of breathing lungs and beating hearts, of undulating tails, running legs, and flapping wings. All these  designs have arisen—and work together—to allow animals, like raindrops in a river basin, to move more easily across a landscape.

The constructal law dictates that flow systems should evolve over time, acquiring better and better configurations to provide more access for the currents that flow through them. Design generation and evolution are macroscopic  physics phenomena that arise naturally to provide better and better flow access to the currents that run through them. The majesty of this principle is that it occurs at every scale. Each component of an evolving flow system—each rivulet, each tree, each road—acquires evolving designs to facilitate flow access. As these elements coalesce into larger and larger structures (into evolving river basins, forests, and transport networks), the various-sized components  work
together so that everything flows more easily. We see this, for example, in the shape and structure of the neural networks in the brain, of the alveoli in the lung, and the human settlements on a map. In the big picture, all the mating and morphing flows on the largest system that surrounds us, the Earth itself, evolve to enhance global flow. E pluribus unum (one out of many).

The constructal  law is revolutionary because  it is a law of physics—and not just of biology, hydrology, geology, geophysics, or engineering. It governs any system, any time, anywhere, encompassing inanimate (rivers and lightning bolts), animate (trees, animals), and engineered (technology) phenomena, as well as the evolving flows of social constructs such as knowledge, language, and culture. All designs arise and evolve according to the same law.

This  law tears  down the walls that have separated the disciplines  of science by providing a new understanding  of what it means to be alive. Life is movement and the constant morphing of the design of this movement. To be alive is to keep on flowing and morphing. When a system stops flowing and morphing, it is dead. Thus, river basins configure and reconfigure themselves to persist in time. When they stop flowing and morphing they become dry riverbeds, that is, the fossilized remains of earlier “live” flow systems. The solid, treelike veins of ore found underground today, for example, are fossils of the fluid streams, eddies, and meanders that flowed before solidification a long time ago. Biological creatures are alive until all their flows (blood, oxygen, locomotion, and so on) stop, after which they, too, become fossilized remains.

This unifying definition marks an advance because it removes the concept of life from  the specialized domain of biology. It aligns  it (or, better, it juxtaposes  it) with the physics concept of the dead state, which means “equilibrium with the environment”  in thermodynamics: a system  that is  at the same  pressure, the same temperature, and so forth as its surroundings, and hence, in which nothing  moves. The constructal  law defines life in physics terms, and it covers  all live-system phenomena. It also reframes the view that life on Earth began with the rise of primitive species some 3.5 billion years ago. As we will see, “life” began much earlier, when the first inanimate systems, such as currents of solar heat and wind, acquired evolving designs. In the big history of life on Earth, the emergence and evolution of inanimate, animate, and technological designs tell a single story. Where Darwin showed the links  between biological creatures, the constructal law connects everything on the planet.

On one level, the const...

Revue de presse

“Fascinating. . . . By reframing things as flow systems, they reveal how function determines form in everything from corporate hierarchies to Canada geese.” —Nature

“Interesting. . . . Brings a useful new perspective to ubiquitous natural phenomena.” —New Scientist

“[I] found myself immediately sucked in. . . . The Constructal Law is important because it not only describes the patterns of change in the world within and around us, but it allows us to predict how the configuration of those patterns will evolve over time.” —Forbes

“Provocative, witty, well written . . . makes a strong case.” —Charlotte Observer

“Brilliant. He effectively illustrates complex ideas for a general audience, provides real-world examples, and includes scholarly notes and references. A landmark publication.” —Library Journal

“Lucidly written. . . . A revolutionary, unifying vision of nature that could impact all branches of science.” —Booklist

“Filled with fascinating observations and brainteasers. . . . Gracefully written.”—Macleans

“Presents complex ideas in an understandable context. . . . Source of food for thought. . . . . Interesting. . . . Excellent reflection on the history of science.” —Winnipeg Free Press

Design in Nature is an elegant exposition of a unifying principle so simple that it demystifies our comprehension of the ‘low’ of the universe. An absorbing and thoughtful account of why nature is designed that way it is; Bejan engages the reader from the very first sentence to last word.” Donald Johanson, Founding Director of the Institute of Human Origins and noted discoverer of “Lucy”

“Why do riverbeds, blood vessels, and lightning bolts all look alike? It’s not a coincidence. This extraordinary book proposes a law of nature whose power is matched only by its simplicity. Everything you lay your eyes on will blow your mind with fresh interpretation.” —David Eagleman, The New York Times bestselling author of Incognito and Sum, and Director of the Laboratory for Perception and Action at the Baylor College of Medicine

“After reading this deeply inspiring and liberating book, you will never look at the world—the whole world—the same again. It not only helps us to better understand the natural environment, but it has profound implications for how we all need to act if we want to sustain success. This perspective is not just for scientists—it helps to reframe agendas for entrepreneurs, business executives, educators, and policy makers. Go with the flow!” —John Hagel, co-author of The Power of Pull, and Co-Chairman of the Deloitte Center for the Edge

“Bejan masterfully unifies—under a deep common law—physics, chemistry, biology, and even part of the social sciences. His treatment of natural design, flow systems, and complex order as spontaneously arising from flow optimization is novel, powerful, and highly plausible.” —Massimo Piattelli-Palmarini, author of What Darwin Got Wrong, and Professor of Cognitive Science at the University of Arizona

“The most amazing thing about life is that it exists at all. The second most amazing thing about life is that living things seem to be so very good at it. In his bold new book Bejan asks why, and his answer cuts to the very core of what life is—organized flows of heat, electricity, matter, and energy. From this deceptively simple idea, Bejan takes us on an incredible expedition through life’s vast scope, from tiniest cell to organism to societies to ecosystems to the entire planet. It is a bracing journey.”  —J. Scott Turner, author of The Tinkerer’s Accomplice, and Professor of Biology at SUNY College of Environmental Science and Forestry in Syracuse

“With wide-ranging examples and the iconic pictures to go with them, Bejan illustrates that nature is inherently an outstanding designer of flow configurations, which raises philosophic issues beyond the remit of thermodynamics. Is the distinction between animate and inanimate blurred by their common constructal design? These and many more issues are raised by Bejan’s distinguished and original work, fittingly presented in Design in Nature.” —Jeffery Lewins, Deputy Praelector at Magdalene College at Cambridge University

“A most stimulating thought principle, framed in a nice and lively personal story. What I really find most exciting is the exceptionally broad perspective that Bejan adopts for developing his concepts. Design in Nature is a fascinating read.” —Ewald Weibel, Professor Emeritus of Anatomy at the University of Berne

“Thought provoking! Thermodynamics may determine where you’re going; here’s a rule that tells how you get there. And so simple—the more efficient the pathway, the more likely is its persistence, whatever the mechanism behind that persistence. This is science at its biggest and boldest.” —Steven Vogel, author of Cats’ Paws and Catapults, and James B. Duke Professor of Biology at Duke University

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Commentaires client les plus utiles sur (beta) 4.3 étoiles sur 5  6 commentaires
5.0 étoiles sur 5 Unification in design 30 mai 2014
Par Michael T. Takac - Publié sur
As physicists struggle with the Grand Unify Theory at the particle level, Adrian Bejan found unification in design at the macro level. The spectrum of this unification range from inanimate to animate pertaining to the natural freedom of flow, evolves in ways that facilitate such flow. The flow for all life includes liberty that facilitates the pursuit of positive-feedback; hence, life’s Unalienable Rights, a manifestation of the Constructal Law, potentially having a profound renaissance in social and economic systems. A must read!
5.0 étoiles sur 5 Amazing book. 21 juillet 2014
Par Richard - Publié sur
Achat vérifié
In its details you can find the missing key to understand our World. Amazing book...!
1 internautes sur 2 ont trouvé ce commentaire utile 
5.0 étoiles sur 5 Hey everybody 9 décembre 2013
Par L. Web - Publié sur
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This book blew my mind. I'm surprised more people are not talking about this subject. Bejan has proposed a new law of physics, everybody. That doesn't happen very often.
1 internautes sur 2 ont trouvé ce commentaire utile 
5.0 étoiles sur 5 Brilliant! 27 octobre 2013
Par Tired - Publié sur
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Simple concept that applies to so many different areas. Very interesting. Persons interested in TOE should read this and reconsider their own ideas.
1 internautes sur 2 ont trouvé ce commentaire utile 
5.0 étoiles sur 5 A law like Gravity, this is the law of Flow--you gotta know about it! 22 août 2013
Par Patricia Kimball - Publié sur
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The writer pitches some very complicated, erudite things so well that even I, with 10th grade Geometry more than 40 years ago, could get the nut & the juice from his fast-paced, interesting, and fun book that explains the operation of the what he calls "the constructal law" across a variety of applications in nature, e.g., the flow of fluids (over soil, within biological systems), heat, populations, knowledge, and more. Some will find the sections on the development of running versus swimming (in competitions over the years, in animals) especially fascinating & probably something new under the sun. The author shares his background, insights, wit & passion generously, tastefully, and in a most entertaining manner. I've bought several copies of this for friends.
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