David Wells – författare

This dictionary of numbers, arranged in order of magnitude, exposes the fascinating facts about certain numbers and number sequences. The aim of the book is to entertain and enthral the reader, which it certainly does.

Why was the number of Hardy's taxi significant? Why does Graham's number need its own notation? How many grains of sand would fill the universe? What is the connection between the Golden Ratio and sunflowers? Why is 999 more than a distress call? All these questions and a host more are answered in this fascinating book, which has now been newly revised, with nearly 200 extra entries and some 250 additions to the original entries. From minus one and its square root, via cyclic, weird, amicable, perfect, untouchable and lucky numbers, aliquot sequences, the Cattle problem, Pascal's triangle and the Syracuse algorithm, music, magic and maps, pancakes, polyhedra and palindromes, to numbers so large that they boggle the imagination, all you ever wanted to know about numbers is here. There is even a comprehensive index for those annoying occasions when you remember the name but can't recall the number.

High Throughput Bioanalytical Sample Preparation: Methods and Automation Strategies is an authoritative reference on the current state-of-the-art in sample preparation techniques for bioanalysis. This book focuses on high throughput (rapid productivity) techniques and describes exactly how to perform and automate these methodologies, including useful strategies for method development and optimization. A thorough review of the literature is included within each of these chapters describing high throughput sample preparation techniques: protein removal by precipitation; equilibrium dialysis and ultrafiltration; liquid-liquid extraction; solid-phase extraction; and various on-line techniques.The text begins with an introductory overview of the role of bioanalysis in pharmaceutical drug development. Fundamental understanding of the strategies for sample preparation is reinforced next, along with essential concepts in extraction chemistry. Several chapters introduce and discuss microplates, accessory products and automation devices. Particular strategies for efficient use of automation within a bioanalytical laboratory are also presented. The subject material then reviews protein precipitation, liquid-liquid extraction, solid-phase extraction and various on-line sample preparation approaches. The book concludes with information on recent advances in sample preparation, such as solid-phase extraction in a card format and higher density extraction plates.Important objectives that can be accomplished when the strategies presented in this book are followed include: improved efficiency in moving discovery compounds to preclinical status with robust analytical methods; return on investment in automation for sample preparation; and improved knowledge and expertise of laboratory staff.�Shows the reader exactly how to perform modern bioanalytical sample preparation techniques, complete with detailed strategies�Thorough literature review and summary of published information�Detailed discussion and examples of the method development process

A fascinating journey into the mind-bending world of prime numbersCicadas of the genus Magicicada appear once every 7, 13, or 17 years. Is it just a coincidence that these are all prime numbers? How do twin primes differ from cousin primes, and what on earth (or in the mind of a mathematician) could be sexy about prime numbers? What did Albert Wilansky find so fascinating about his brother-in-law''s phone number?Mathematicians have been asking questions about prime numbers for more than twenty-five centuries, and every answer seems to generate a new rash of questions. In Prime Numbers: The Most Mysterious Figures in Math, you''ll meet the world''s most gifted mathematicians, from Pythagoras and Euclid to Fermat, Gauss, and Erd?o?s, and you''ll discover a host of unique insights and inventive conjectures that have both enlarged our understanding and deepened the mystique of prime numbers. This comprehensive, A-to-Z guide covers everything you ever wanted to know--and much more that you never suspected--about prime numbers, including:* The unproven Riemann hypothesis and the power of the zeta function* The "Primes is in P" algorithm* The sieve of Eratosthenes of Cyrene* Fermat and Fibonacci numbers* The Great Internet Mersenne Prime Search* And much, much more

Although Green approaches to politics have had some practical successes in a range of different countries, the movement has lacked a fully developed and coherent political theory. In this unique study David Wells and Tony Lynch demonstrate that ecological understanding and environmental concern are not just consistent with notions of social equity and grass-roots democracy, but that a concern for these aims are the logical consequence of what might be called 'political ecology'. They begin with a critique of existing approaches to Green politics, with particular attention to the claims of 'deep ecology' and go on to develop an important examination of the relationship between economic and ecological styles of thinking. They conclude with a 'social commons' inspired revision of Lockean politics. What emerges is an important understanding of the tasks of politics: rather than focusing on 'foreground' issues of individual choice, the central political challenge of our age is with the management and provision of the background conditions (the ecological conditions - understood in the broadest sense) which allows the possibility of a reasonable life. The analysis shows a concern with environmental commons engenders equal concerns for social, economic and cultural commons, develops an account of how such commons can be effectively managed and relates this account to more traditional political themes of democracy, liberty and equity.

The appeal of games and puzzles is timeless and universal. In this unique book, David Wells explores the fascinating connections between games and mathematics, proving that mathematics is not just about tedious calculation but imagination, insight and intuition. The first part of the book introduces games, puzzles and mathematical recreations, including knight tours on a chessboard. The second part explains how thinking about playing games can mirror the thinking of a mathematician, using scientific investigation, tactics and strategy, and sharp observation. Finally the author considers game-like features found in a wide range of human behaviours, illuminating the role of mathematics and helping to explain why it exists at all. This thought-provoking book is perfect for anyone with a thirst for mathematics and its hidden beauty; a good high school grounding in mathematics is all the background that is required, and the puzzles and games will suit pupils from 14 years.

The appeal of games and puzzles is timeless and universal. In this unique book, David Wells explores the fascinating connections between games and mathematics, proving that mathematics is not just about tedious calculation but imagination, insight and intuition. The first part of the book introduces games, puzzles and mathematical recreations, including knight tours on a chessboard. The second part explains how thinking about playing games can mirror the thinking of a mathematician, using scientific investigation, tactics and strategy, and sharp observation. Finally the author considers game-like features found in a wide range of human behaviours, illuminating the role of mathematics and helping to explain why it exists at all. This thought-provoking book is perfect for anyone with a thirst for mathematics and its hidden beauty; a good high school grounding in mathematics is all the background that is required, and the puzzles and games will suit pupils from 14 years.

Although Green approaches to politics have had some practical successes in a range of different countries, the movement has lacked a fully developed and coherent political theory. In this unique study David Wells and Tony Lynch demonstrate that ecological understanding and environmental concern are not just consistent with notions of social equity and grass-roots democracy, but that a concern for these aims are the logical consequence of what might be called ''political ecology''. They begin with a critique of existing approaches to Green politics, with particular attention to the claims of ''deep ecology'' and go on to develop an important examination of the relationship between economic and ecological styles of thinking. They conclude with a ''social commons'' inspired revision of Lockean politics. What emerges is an important understanding of the tasks of politics: rather than focusing on ''foreground'' issues of individual choice, the central political challenge of our age is with the management and provision of the background conditions (the ecological conditions - understood in the broadest sense) which allows the possibility of a reasonable life. The analysis shows a concern with environmental commons engenders equal concerns for social, economic and cultural commons, develops an account of how such commons can be effectively managed and relates this account to more traditional political themes of democracy, liberty and equity.

Although Green approaches to politics have had some practical successes in a range of different countries, the movement has lacked a fully developed and coherent political theory. In this unique study David Wells and Tony Lynch demonstrate that ecological understanding and environmental concern are not just consistent with notions of social equity and grass-roots democracy, but that a concern for these aims are the logical consequence of what might be called ''political ecology''. They begin with a critique of existing approaches to Green politics, with particular attention to the claims of ''deep ecology'' and go on to develop an important examination of the relationship between economic and ecological styles of thinking. They conclude with a ''social commons'' inspired revision of Lockean politics. What emerges is an important understanding of the tasks of politics: rather than focusing on ''foreground'' issues of individual choice, the central political challenge of our age is with the management and provision of the background conditions (the ecological conditions - understood in the broadest sense) which allows the possibility of a reasonable life. The analysis shows a concern with environmental commons engenders equal concerns for social, economic and cultural commons, develops an account of how such commons can be effectively managed and relates this account to more traditional political themes of democracy, liberty and equity.

This is the ninth book of problems and solutions from the American Mathematics Competitions (AMC) contests. It chronicles 325 problems from the thirteen AMC 12 contests given in the years between 2001 and 2007. The authors were the joint directors of the AMC 12 and the AMC 10 competitions during that period.The problems have all been edited to ensure that they conform to the current style of the AMC 12 competitions. Graphs and figures have been redrawn to make them more consistent in form and style, and the solutions to the problems have been both edited and supplemented. A problem index at the back of the book classifies the problems into subject areas of Algebra, Arithmetic, Complex Numbers, Counting, Functions, Geometry, Graphs, Logarithms, Logic, Number Theory, Polynomials, Probability, Sequences, Statistics, and Trigonometry. A problem that uses a combination of these areas is listed multiple times.The problems on these contests are posed by members of the mathematical community in the hope that all secondary school students will have an opportunity to participate in problem-solving and an enriching mathematical experience.

For more than 50 years, the Mathematical Association of America has been engaged in the construction and administration of challenging contests for students in American and Canadian high schools. The problems for these contests are constructed in the hope that all high school students interested in mathematics will have the opportunity to participate in the contests and will find the experience mathematically enriching. These contests are intended for students at all levels, from the average student at a typical school who enjoys mathematics to the very best students at the most special school. In the year 2000, the Mathematical Association of America initiated the American Mathematics Competitions 10 (AMC 10) for students up to grade 10.The Contest Problem Book VIII is the first collection of problems from that competition covering the years 2001-2007. J. Douglas Faires and David Wells were the joint directors of the AMC 10 and AMC 12 during that period, and have assembled this book of problems and solutions. There are 350 problems from the first 14 contests included in this collection. A Problem Index at the back of the book classifies the problems into the following major subject areas: Algebra and Arithmetic, Sequences and Series, Triangle Geometry, Circle Geometry, Quadrilateral Geometry, Polygon Geometry, Counting Coordinate Geometry, Solid Geometry, Discrete Probability, Statistics, Number Theory, and Logic.The major subject areas are then broken down into subcategories for ease of reference. The problems are cross-referenced when they represent several subject areas.

This is a guide to the teaching of computing and coding in primary schools, and an exploration of how children develop their computational thinking. It covers all areas of the National Curriculum for primary computing and offers insight into effective teaching.The text considers three strands of computer science, digital literacy and information technology. The teaching of coding is especially challenging for primary teachers, so it highlights learning on this, giving practical examples of how this can be taught. For all areas of the computing curriculum the text also provides guidance on planning age-appropriate activities with step-by-step guides and details of educationally appropriate software and hardware.This book helps you to connect what you need to teach with how it can be taught, and opens up opportunities in the new curriculum for creative and imaginative teaching. It also includes the full National Curriculum Programme of Study for Computing, key stages 1 and 2 as a useful reference for trainee teachers.

This is a guide to the teaching of computing and coding in primary schools, and an exploration of how children develop their computational thinking. It covers all areas of the National Curriculum for primary computing and offers insight into effective teaching.The text considers three strands of computer science, digital literacy and information technology. The teaching of coding is especially challenging for primary teachers, so it highlights learning on this, giving practical examples of how this can be taught. For all areas of the computing curriculum the text also provides guidance on planning age-appropriate activities with step-by-step guides and details of educationally appropriate software and hardware.This book helps you to connect what you need to teach with how it can be taught, and opens up opportunities in the new curriculum for creative and imaginative teaching. It also includes the full National Curriculum Programme of Study for Computing, key stages 1 and 2 as a useful reference for trainee teachers.

It takes no courage to sign up as a Protestant. These words begin this bold worka "e;the culmination of David Wells' long-standing critique of the evangelical landscape. But to live as a true Protestanta "e;that's another matter.This book is a jeremiad against new versions of Evangelicalisma "e;the Marketing and Emergent Churches a "e;and a call to return to the historic faith, one defined by Reformation solas (grace, faith, and scripture alone), and to a reverence for doctrine. Wells argues that historic, classical Evangelicalism is marked by doctrinal seriousness, as opposed to the new movements of the Marketing Church and the Emergent Church. He energetically confronts the Marketing communities and their tendency to try to win parishioners as consumers rather than worshipers, advertising the most palatable environment rather than trusting the truth to be attractive. He takes particular issue with the most popular evangelical movement in recent yearsa "e;the Emergent Church. Emergents, he says, are postmodern, postconservative, and postfoundational, embracing a less absolute understanding of the authority of scripture than traditionally held.The Courage to be Protestant is a dynamic argument for the courage to be faithful to what biblical Christianity has always stood for, thereby securing hope for the church's future.

History does not repeat itself, but it does rhyme. This vital truth, attributed to Mark Twain, has been the inspiration for a unique collection of rap poems about the US presidents, each illustrated with a creative caricature by the up-and-coming artist Molly Brau. Find out more about the presidents backgrounds, accomplishments, personality quirks, successes, and failures in the whimsical hip-hop style. Jack was Jammin! Truman was Truckin! Taft was Phat!

This is a guide to the teaching of computing and coding in primary schools, and an exploration of how children develop their computational thinking. It covers all areas of the National Curriculum for primary computing and offers insight into effective teaching.The text considers three strands of computer science, digital literacy and information technology. The teaching of coding is especially challenging for primary teachers, so it highlights learning on this, giving practical examples of how this can be taught. For all areas of the computing curriculum the text also provides guidance on planning age-appropriate activities with step-by-step guides and details of educationally appropriate software and hardware.This book helps you to connect what you need to teach with how it can be taught, and opens up opportunities in the new curriculum for creative and imaginative teaching. It also includes the full National Curriculum Programme of Study for Computing, key stages 1 and 2 as a useful reference for trainee teachers.

What if you had a hidden inner self you never knew about? This key to your horoscope is the moon sign!Many people understand their sun sign, but few realise that the key to their astrological insight is unlocked by a deeper truth: the moon sign. Your moon sign is a reflection of your secret inner self, and has important messages to aid you in your career, love life and ultimately your destiny. Understanding the secret power of your moon sign is now easier than ever with this short guide. Specially aligned for your individual moon sign of Aries, this book has been carefully charted and prepared by astrology expert David Wells, whose advice will help you quickly understand: • Your overall astrological outlook for 2014• How your moon sign co-operates, or interferes with, your sun sign in 2014• How your moon sign affects your romantic life, your work life and your spiritual life.You won''t want to overlook this important part of your astrological make up in the coming year with this brilliant new series! Visit moon-sign-calculator.com to calculate your moon sign and find out yours today!

What if you had a hidden inner self you never knew about? This key to your horoscope is the moon sign!Many people understand their sun sign, but few realise that the key to their astrological insight is unlocked by a deeper truth: the moon sign. Your moon sign is a reflection of your secret inner self, and has important messages to aid you in your career, love life and ultimately your destiny. Understanding the secret power of your moon sign is now easier than ever with this short guide. Specially aligned for your individual moon sign of Scorpio, this book has been carefully charted and prepared by astrology expert David Wells, whose advice will help you quickly understand: • Your overall astrological outlook for 2014• How your moon sign co-operates, or interferes with, your sun sign in 2014• How your moon sign affects your romantic life, your work life and your spiritual life.You won''t want to overlook this important part of your astrological make up in the coming year with this brilliant new series! Visit moon-sign-calculator.com to calculate your moon sign and find out yours today!

What if you had a hidden inner self you never knew about? This key to your horoscope is the moon sign!Many people understand their sun sign, but few realise that the key to their astrological insight is unlocked by a deeper truth: the moon sign. Your moon sign is a reflection of your secret inner self, and has important messages to aid you in your career, love life and ultimately your destiny. Understanding the secret power of your moon sign is now easier than ever with this short guide. Specially aligned for your individual moon sign of Capricorn, this book has been carefully charted and prepared by astrology expert David Wells, whose advice will help you quickly understand: • Your overall astrological outlook for 2014• How your moon sign co-operates, or interferes with, your sun sign in 2014• How your moon sign affects your romantic life, your work life and your spiritual life.You won''t want to overlook this important part of your astrological make up in the coming year with this brilliant new series! Visit moon-sign-calculator.com to calculate your moon sign and find out yours today!