The Pursuit of Perfect Packing (2nd Edition) (Repost)

The Pursuit of Perfect Packing (2nd Edition) By Denis Weaire, Tomaso Aste


2008 | 216 Pages | ISBN: 1420068172 | PDF | 4 MB

Coauthored by one of the creators of the most efficient space packing solution, the Weaire–Phelan structure, The Pursuit of Perfect Packing, Second Edition explores a problem of importance in physics, mathematics, chemistry, biology, and engineering: the packing of structures. Maintaining its mathematical core, this edition continues and revises some of the stories from its predecessor while adding several new examples and applications.


The book focuses on both scientific and everyday problems ranging from atoms to honeycombs. It describes packing models, such as the Kepler conjecture, Voronoï decomposition, and Delaunay decomposition, as well as actual structure models, such as the Kelvin cell and the Weaire–Phelan structure. The authors discuss numerous historical aspects and provide biographical details on influential contributors to the field, including emails from Thomas Hales and Ken Brakke.


With examples from physics, crystallography, engineering, and biology, this accessible and whimsical book touches on many aspects of packing objects. It will help you understand components of packing and aid you in the quest for the perfect packing solution.

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Practice Makes Perfect Arabic Vocabulary: With 145 Exercises

Practice Makes Perfect Arabic Vocabulary: With 145 Exercises by Mahmoud Gaafar and Jane Wightwick


English, Arabic | 2012 | ISBN: 0071756396 | 208 pages | EPUB + azw | 9,4 + 30 MB

Go beyond Marhaba and add thousands of words and expressions to your Arabic vocabulary




To communicate comfortably in Arabic, you need easy access to a variety of words and expressions. In Practice Makes Perfect: Arabic Vocabulary you get the tools you need to expand your lexicon and sharpen your speaking and writing skills. And how do you do this? PRACTICE, PRACTICE, PRACTICE!




Each chapter of this comprehensive book focuses on a theme, such as family, food, or travel, so you can build your language skills in a systematic manner. As you lay the foundation for a burgeoning vocabulary, you will be able to weave your way in and out of English and Arabic to gain the confidence you need to communicate with ease.




Practice Makes Perfect: Arabic Vocabulary offers you:




Thousands of new words and expressions


More than 250 fun exercises


Handy cultural and social tips and an insight into Arab life


An answer key to gauge your comprehension




With help from this book, you can easily communicate in Arabic about:


Education, careers, and skills * Vacations and adventures * Culture, society, and traditions * Cooking and recipes * Your neighborhood and home * Your family and friends * Environmental issues * Crime, justice, and politics . . . and much more

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