... Block Chaining) cannot be used for voice encryption; block ciphers require the accurate reception of an entire block in order for any portion of the block to be correctly decrypted P25 voice encryption ... 2010 ACM [11] Icom Icom PCR2500 Communications Receiver http://www.icomamerica.com/en/ products/pcr2500 [12] H T Kung and D Vlah Efficient location tracking using sensor networks In Wireless Communications ... cryptographic protocols, such as those based on block ciphers and MACs This ad hoc design might by itself represent a security concern In fact, the design introduces significant certificational weaknesses...
... Transistor Scientific American: The Solid-State Century Copyright 1997 Scientific American, Inc 19 20 Scientific American: The Solid-State Century Copyright 1997 Scientific American, Inc The Transistor ... Scientific American: The Solid-State Century Copyright 1997 Scientific American, Inc 15 BELL LABS, LUCENT TECHNOLOGIES This article, which appeared in the September 1948 issue of Scienti c American, ... Semiconductor specialists could use it to check the cleanliness of a processing line, in which even a few stray molecules can render a chip useless Law-enforcement and security officials could check...
... 1995, the Hubble Space Telescope discovered a belt of perhaps 200 million comets encircling the solar system 46 Scientific American Presents Copyright 1998 Scientific American, Inc EXTREMELY LARGE ... MIMAS CENTER OF HERSCHEL CRATER ITHACA CHASMA Copyright 1998 Scientific American, Inc S aturn’s rings make it one of the most familiar, and spectacular, images of astronomy, not to mention science ... revealed by the Doppler Copyright 1998 Scientific American, Inc Magnificent Cosmos 11 closer: it causes the sun to move a mere nine centimeters a second Yet some uncertainty about each extrasolar planet’s...
... of many ocSA casions when child—not parent—decides life’s pace Focus on Pregnancy Scientific American Presents Copyright 1998 Scientific American, Inc P Today there are better choices for pain ... infertility, ectopic pregnancy, chronic pelvic pain Antibiotics available; no vaccine Gonorrhea 25–75 Pelvic inflammatory disease, infertility, ectopic pregnancy, chronic pelvic pain Antibiotics available ... 1998 Scientific American, Inc Chemical barriers Chemical barriers, such as spermicides, not block the exchange of bodily fluids at all—but actively kill the viruses and bacteria that can cause...
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... around Mars 40 Scientific American Presents Copyright 1999 Scientific American, Inc Copyright 1999 Scientific American, Inc The Future of Space Exploration 41 the NASA Johnson Space Center and Stanford ... Exploring Mars Scientific American Presents Copyright 1999 Scientific American, Inc JOHNNY JOHNSON W Lucid; SCIENTIFIC AMERICAN, May 1998] Because she actually implemented the rigorous exercise program ... spectrometer Alpha-particle spectrometer Initial lunar orbit Copyright 1999 Scientific American, Inc LAURIE GRACE Lunar Prospector Lunar Prospector Trajectory Launch Date: January 6, 1998 Cost:...
... to Masculinity Copyright 1999 Scientific American, Inc 25 JOHN COLETTI Stock Boston I DEFINING MEN S by Doreen Kimura ex Differences Copyright 1999 Scientific American, Inc 26 Brain SPENCER GRANT ... opposite page) Covering the myofibrils is a sarcoplasmic reticulum; the calcium it contains plays a role in triggering muscle contraction 50 SCIENTIFIC AMERICAN PRESENTS The Mystery of Muscle Copyright ... The ratchetlike cycle can happen five times a second in a rapidly contracting muscle As the cycles occur, various reactions convert the ADP back to ATP to keep fueling the contraction Three Kinds...
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... 17 SCIENTIFIC AMERICAN PRESENTS Copyright 1999 Scientific American, Inc TOWER CRANES SPILLWAY DIVERTED YANGTZE LEFT TRAINING WALL THE BIG, THE SMALL Copyright 1999 Scientific American, Inc CONVEYOR ... electrons in the system 24 Copyright 1999 Scientific American, Inc by Sasha Nemecek COURTESY OF DONALD M EIGLER IBM Almaden Research Center Required 25 Copyright 1999 Scientific American, Inc ... a Chinese water clock, by Su Sung); A McPHAIL Tony Stone Images (fence); CORBIS (vaccine; refrigerator); CULVER PICTURES (bridge; Crystal Palace); CORBIS/BETTMANN (loom); CORBIS/HISTORICAL PICTURE...
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... physicists to tease it out —L.M.K from other forces of nature 34 Vacuum fluctuations Casimir plates SCIENTIFIC AMERICAN THE ONCE AND FUTURE COSMOS COPYRIGHT 2002 SCIENTIFIC AMERICAN, INC JARED SCHNEIDMAN ... SCIENTIFIC AMERICAN THE ONCE AND FUTURE COSMOS COPYRIGHT 2002 SCIENTIFIC AMERICAN, INC COSMIC EXPANSION could, in theory, follow one of three simple patterns: it may be constant (left), decelerating ... SURVEYING SPACETIME 22 SCIENTIFIC AMERICAN THE ONCE AND FUTURE COSMOS COPYRIGHT 2002 SCIENTIFIC AMERICAN, INC WITH SUPERNOVAE Exploding stars seen across immense distances show that the cosmic expansion...
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... www.sciam.com SCIENTIFIC AMERICAN COPYRIGHT 2003 SCIENTIFIC AMERICAN, INC 27 EMERGENCE Who Were the NEANDERTALS? 28 SCIENTIFIC AMERICAN Updated from the April 2000 issue COPYRIGHT 2003 SCIENTIFIC ... effectively in the extremely cold weather brought on by glacial cycles But other traits, such as the form of the Neander- www.sciam.com SCIENTIFIC AMERICAN COPYRIGHT 2003 SCIENTIFIC AMERICAN, INC ... DIRECTOR, INTERNATIONAL: Charles McCullagh VICE PRESIDENT: Frances Newburg John Rennie Editor in Chief Scientic American editors@sciam.com KAZUHIKO SANO DIRECTOR, ANCILLARY PRODUCTS: Diane McGarvey...
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