Libros de ciencias, página 42 de 2691

A importancia do Proxecto Xenoma Humano non reside tanto no que poida, de feito, revelar sobre a bioloxía como na validación e reforzo que fai do determinismo biolóxico como explicación de todas as diferenzas sociais e individuais.Trad. do ingles e notas: Fernando Vazquez Corredoira e Salvador Mourelo Peres.

El embrión del que nació este libro lo constituyó una serie de artículos publicados en la revista Tribuna de Astronomía en los años noventa. Ese material, reestructurado y enriquecido, condujo a una primera edicion de la obra en 1998 y a una segunda, revisada y ampliada, en 2008. El paso del tiempo y los comentarios del publico lector permiten que aparezca hoy esta nueva edicion muy mejorada con la que el autor cumple una aspiracion desde que la concibio por primera vez: su caracter ilustrado, a todo color, con fotografias de la maxima calidad, proporcionadas por uno de los mejores astrofotografos del mundo, Juan Carlos Casado. El tratamiento de asuntos cientificos tan visuales como los incluidos en esta obra mejora muchisimo al presentar, junto a las explicaciones, algunas de las mejores plasmaciones fotograficas disponibles de estos fenomenos, muchas de las cuales recibieron el reconocimiento de la NASA como Astronomy Picture of the Day (APOD). Ojala estas paginas sirvan para mover a quien las lea a levantarse del asiento y salir al aire libre para mirar el cielo.

A ras de cielo pone en sus manos una guía de astronomía cotidiana, un conjunto de explicaciones con las que comprender los fenómenos que se observan en el firmamento cualquier noche sin necesidad de aparatos costosos ni formulas matematicas. Vea naves espaciales hoy mismo. Entienda que son las estrellas fugaces y observelas. ¿Por que la Luna al salir se ve tan grande? ¿Cuantas estrellas son de color verde? ¿Como es que la Luna nos enseña siempre la misma cara y que tiene eso que ver con el flujo y reflujo de la marea? ¿De verdad vemos estrellas que ya no existen? Lea la hora en el firmamento. Vea el rayo verde. ¿Por que parpadean las estrellas?... Un repertorio de motivos para recuperar el cielo como paisaje natural accesible y repleto de belleza, tradicion, cultura y entretenimiento. Una obra para publico general y que propone una aproximacion reflexiva y tambien activa a la ciencia actual.

Freshwater ecosystems are under increasing pressure as human populations grow and the need for clean water intensifies. The demand for ecologists and environmental managers who are trained in basic freshwater ecology has never been greater. Students and practitioners new to the field of freshwater ecology and management need a text that provides them with an accessible introduction to the key questions while still providing sufficient background on basic scientific methods. Gerry Closs, Barbara Downes and Andrew Boulton have written a text that meets the requirements of these students. Following an introduction to scientific methodology and its application to the study of ecology, several key concepts in freshwater ecology are reviewed using a wide range of scientific studies into fundamental and applied ecological questions. Key ecological questions that are explored in a freshwater context include the role of animal dispersal and predators on freshwater community structure and the impact of pollutants and introduced species on freshwater ecosystems. This book represents the only freshwater ecology textbook that is specifically aimed at an introductory level. It will also be a useful primer for students who have not previously taken a specialized freshwater course but who require an accessible overview of the subject. General reviews on the methods of science, influence of scale, and the main features of freshwater systems. Coverage of several fundamental and applied ecological questions. A logical structure in each chapter that builds from a general observation of an ecological pattern, to an exploration of the various scientific approachesthat can be used to investigate such patterns. Suggested further reading lists for each chapter.

Focusing on applicable rather than applied mathematics, this text begins with an examination of linear systems of differential equations and 2-dimensional linear systems and then explores the use of polar coordinate techniques, Liapunov stability and elementary ideas from dynamic systems. Features an in-depth treatment of existence and uniqueness theorems, more. 1986 edition. Includes 39 figures.

Manifolds are abound in mathematics and physics, and increasingly in cybernetics and visualization where they often reflect properties of complex systems and their configurations. Differential topology gives us the tools to study these spaces and extract information about the underlying systems. This book offers a concise and modern introduction to the core topics of differential topology for advanced undergraduates and beginning graduate students. It covers the basics on smooth manifolds and their tangent spaces before moving on to regular values and transversality, smooth flows and differential equations on manifolds, and the theory of vector bundles and locally trivial fibrations. The final chapter gives examples of local-to-global properties, a short introduction to Morse theory and a proof of Ehresmann's fibration theorem. The treatment is hands-on, including many concrete examples and exercises woven into the text, with hints provided to guide the student.

In the bestselling, prize-winning "A Short History of Nearly Everything", Bill Bryson achieved the seemingly impossible by making the world of science both understandable and entertaining to millions of people around the globe. Now, in this glorious new illustrated edition, everything that has happened from the Big Bang to the rise of civilization is even more vividly brought to life with stunning full-colour photographs, drawings, portraits, and cartoons.

Bill Bryson describes himself as a reluctant traveller: but even when he stays safely in his own study at home, he can''t contain his curiosity about the world around him. A Short History of Nearly Everything is his quest to find out everything that has happened from the Big Bang to the rise of civilization - how we got from there, being nothing at all, to here, being us.Bill Bryson''s challenge is to take subjects that normally bore the pants off most of us, like geology, chemistry and particle physics, and see if there isn''t some way to render them comprehensible to people who have never thought they could be interested in science. It''s not so much about what we know, as about how we know what we know. How do we know what is in the centre of the Earth, or what a black hole is, or where the continents were 600 million years ago? How did anyone ever figure these things out?On his travels through time and space, he encounters a splendid collection of astonishingly eccentric, competitive, obsessive and foolish scientists, like the painfully shy Henry Cavendish who worked out many conundrums like how much the Earth weighed, but never bothered to tell anybody about many of his findings. In the company of such extraordinary people, Bill Bryson takes us with him on the ultimate eye-opening journey, and reveals the world in a way most of us have never seen it before.

The incomparable Bill Bryson travels through time and space to introduce us to the world, the universe and everything in this groundbreaking book, the best selling popular science book of the 21st century.Bill Bryson describes himself as a reluctant traveller, but even when he stays safely at home he can''t contain his curiosity about the world around him. A Short History of Nearly Everything is his quest to understand everything that has happened from the Big Bang to the rise of civilization - how we got from there, being nothing at all, to here, being us. Bill Bryson''s challenge is to take subjects that normally bore the pants off most of us, like geology, chemistry and particle physics, and see if there isn''t some way to render them comprehensible to people who have never thought they could be interested in science.The ultimate eye-opening journey through time and space, A Short History of Nearly Everything is the biggest-selling popular science book of the 21st century, and reveals the world in a way most of us have never seen it before.

This book deserves a place in your bookcase next to Harari's Sapiens. It's every bit as fascinating and is surely destined to be just as successful' Julian NortonFrom the plains of ancient Mesopotamia to the vast sheep farms of modern-day Australia, sheep have been central to the human story. Since our our Neolithic ancestors' first forays into sheep-rearing nearly 11,000 years ago, these remarkable animals have fed us, clothed us, changed our diet and language and financed the conquest of large swathes of the earth.Sally Coulthard weaves this fascinating story into a vivid and colourful tapestry of engaging anecdotes and extraordinary ovine facts, whose multiple strands celebrate just how pivotal these woolly animals are to almost every aspect of human society and culture.This title was published also in the United States under the title Follow the Flock.

Quantum information and computation is a rapidly expanding and cross-disciplinary subject. This book gives a self-contained introduction to the field for physicists, mathematicians and computer scientists who want to know more about this exciting subject. After a step-by-step introduction to the quantum bit (qubit) and its main properties, the author presents the necessary background in quantum mechanics. The core of the subject, quantum computation, is illustrated by a detailed treatment of three quantum algorithms: Deutsch, Grover and Shor. The final chapters are devoted to the physical ...