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impossible to predict when a given atom will decay, but given a large number of similar atoms the decay rate, on average, is predictable. The SI unit of radioactive decay is the becquerel (Bq). One Bq is defined as one transformation (or decay) per second. Since any reasonably-sized sample of radioactive material contains many atoms, a Bq is a tiny measure of activity; amounts on the order of TBq (terabecquerel) or GBq (gigabecquerel) are commonly used. Another unit of radioactivity is the curie, Ci, which was originally defined as the activity of one gram of pure radium, isotope Ra-226. At present it is equal, by definition, to the activity of any radionuclide decaying with a disintegration rate of 3.7 × 1010 Bq. The use of Ci is presently discouraged by the SI. History of nuclear power The basic process of Nuclear Power is an exothermic chemical decomposition reaction that heats water to steam
SISUKORD ENERGY STORY................................................................................................................4 USES OF ENERGY............................................................................................................. 4 2.1 Uses of energy in homes...............................................................................................5 2.2 Types of energy used in homes.................................................................................... 6 2.3 Energy use in different types of homes........................................................................ 6 2.4 Commercial Energy Use...............................................................................................9 2.5 Industrial and Manufacturing Energy Use..................................................................11 2.6 Transportation Energy Use.........................................................................................12 RENE
The Cataclysmic Death of Stars Republished from the pages of National Geographic magazine Written by Ron Cowen March 2007 Ever since he was a teenager, Stan Woosley has had a love for chemical elements and a fondness for blowing things up. Growing up in the late 1950s in Texas, "I did everything you could do with potassium nitrate, perchlorate, and permanganate, mixed with a lot of other things," he says. "If you mixed potassium nitrate with sulfur and charcoal, you got gunpowder. If you mixed it with sugar, you got a lot of smoke and a nice pink fire." He tested his explosive concoctions on a Fort Worth golf course: "I screwed the jar down tight and ran like hell." "kaboomWoosley", now an astronomer at the University of California at Santa Cruz, has graduated to bigger explosions--much bigger. Woosley studies some of the most powerful explosions since the birth of the universe: supernovae, the violent deaths of stars. The universe twinkles with these cataclysms. They happen every sec
2 Photographic camera & photography (SEBA) Photographic camera is an equipment used for taking photographs (usually consisting of a lightproof box with a lens at one end and light-sensitive film at the other) Photography is The art or practice of taking and processing photographs. 3 Context of the creation of the camera (CARLA) The camera has been used since before Christ. The impact in society the emergence of the camera was important and shocking because it helped us capture important moments in time that can no longer be repeated and helped a lot in the field of communication. The first models of cameras were used in the years before Christ where they were used to see closely objects. After its emergence was marked a before and after in history because thanks to this artefact can capture exact moments in which a event happened. Advancing in history have improved the types of cameras, passing cameras that took several min
Hard rock Karl-Richard Sänna Form 9B Hard rock (or heavy rock) A loosely defined subgenre of rock music which has its earliest roots in mid-1960s garage rock, blues rock and psychedelic rock Typified by a heavy use of distorted electric guitars, bass guitar, drums, and often accompanied with pianos and keyboards Developed into a major form of popular music in the 1970s and reached a commercial peak in the mid to late 1980s Led Zeppelin, The Who, Deep Purple, Aerosmith, AC/DC, Van Halen, Bon Jovi, Def Leppard, Guns N' Roses Definitions A form of loud, aggressive rock music Has sometimes been labelled cock rock for its emphasis on overt masculinity and sexuality and because it has historically been predominately performed and consumed by men: in the case of its audience, particularly white, working-class adolescents In the late 1960s the term heavy metal was used interchangeably with hard rock, but gradually began to be used to de
More praise for Influence: Science and Practice! "We've known for years that people buy based on emotions and justify their buying decision based on logic. Dr. Cialdini was able, in a lucid and cogent manner, to tell us why this happens." --MARK BLACKBURN, Sr. Vice President, Director of Insurance Operations, State Auto Insurance Companies "Dr. Cialdini's ability to relate his material directly to the specifics of what we do with our customers and how we do it, enabled us to make significant changes. His work has enabled us to gain significant competitive differentiation and advantage" -LAURENCE HOF, Vice President, Relationship Consulting, Advanta Corporation "This will help executives make better decisions and use their influence wisely ... Robert Cialdini has had a greater impact on my thinking on this topic than any other scientist." -CHARLES T. MUNGER, Vice Chairman, Berkshire Hathaway, Inc.
Just realize that science is, alas, often as political as a dinner party with die- hard Democrats and Republicans. Consensus comes late at best. Don't use skepticism as a thinly veiled excuse for inaction or remaining in your comfort zone. Be skeptical, but for the right reason: because you're looking for the most promising option to test in real life. Be proactively skeptical, not defensively skeptical. Let me know if you make a cool discovery or prove me wrong. This book will evolve through your feedback and help. RULE #5. ENJOY IT. I've included a lot of odd experiences and screwups just for simple entertainment value. All fact and no play makes Jack a dull boy. Much of the content is intended to be read as the diary of a madman. Enjoy it. More than anything, I'd like to impart the joy of exploration and discovery. Remember: this isn't a homework assignment. Take it at your own pace.
Color-- -1- -2- -3- -4- -5- -6- -7- -8- -9- Text Size-- 10-- 11-- 12-- 13-- 14-- 15-- 16-- 17-- 18-- 19-- 20-- 21-- 22-- 23-- 24 TWILIGHT By Stephenie Meyer Contents PREFACE 1. FIRST SIGHT 2. OPEN BOOK 3. PHENOMENON 4. INVITATIONS 5. BLOOD TYPE 6. SCARY STORIES 7. NIGHTMARE 8. PORT ANGELES 9. THEORY 10. INTERROGATIONS 11. COMPLICATIONS 12. BALANCING 13. CONFESSIONS 14. MIND OVER MATTER 15. THE CULLENS 16. CARLISLE 17. THE GAME 18. THE HUNT 19. GOODBYES 20. IMPATIENCE 21. PHONE CALL 22. HIDE-AND-SEEK 23. THE ANGEL 24. AN IMPASSE EPILOGUE: AN OCCASION twilight STEPHENIE MEYER LITTLE, BROWN AND COMPANY New York Boston Text copyright © 2005 by Stephenie Meyer All rights reserved. Little, Brown and Company Time Warner Book Group 1271 Avenue of the Americas, New York, NY 10020 Visit our Web site at www.lb-teens.com First Edition: September 2005 The characters and events portrayed in this book are fictitious. Any similarity to real persons, living or dead, is coincidental and not intende
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