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Wireless Networks
SUBJECT WIRELESS NETWORKS SESSION 2 WIRELESS Cellular Concepts and Designs" SESSION 2 Wireless A handheld marine radio. Part of a series on Antennas Common types[show] Components[show] Systems[hide] Antenna farm Amateur radio Cellular network Hotspot Municipal wireless network Radio Radio masts and towers Wi-Fi 1 Wireless Safety and regulation[show] Radiation sources / regions[show] Characteristics[show] Techniques[show] V T E Wireless communication is the transfer of information between two or more points that are not connected by an electrical conductor. The most common wireless technologies use radio. With radio waves distances can be short, such as a few meters for television or as far as thousands or even millions of kilometers for deep-space radio communications. It encompasses various types of fixed, mobile, and portable applications, including two-way radios, cellular telephones, personal digital assistants (PDAs), and wireless networking. Other examples of applications of radio wireless technology include GPS units, garage door openers, wireless computer mice,keyboards and headsets, headphones, radio receivers, satellite television, broadcast television and cordless telephones. Somewhat less common methods of achieving wireless communications include the use of other electromagnetic wireless technologies, such as light, magnetic, or electric fields or the use of sound. Contents [hide] 1 Introduction 2 History o 2.1 Photophone o 2.2 Early wireless work o 2.3 Radio 3 Modes o 3.1 Radio o 3.2 Free-space optical o 3.3 -
Letter from Alexander Graham Bell to Alexander Melville Bell, February 26, 1880, with Transcript
Library of Congress Letter from Alexander Graham Bell to Alexander Melville Bell, February 26, 1880, with transcript ALEXANDER GRAHAM BELL TO HIS FATHER A. MELVILLE BELL 904 14th Street, N. W., Washington, D. C. Feb. 26th, 1880. Dear Papa: I have just written to Mamma about Mabel's baby and I now write to you about my own! Only think! — Two babies in one week! The first born at 904 14th Street — on the fifteenth inst., the other at my laboratory on the nineteenth. Both strong vigorous healthy young things and both destined I trust to grow into something great in the future. Mabel's baby was light enough at birth but mine was LIGHT ITSELF! Mabel's baby screamed inarticulately but mine spoke with distinct enunciation from the first. I have heard articulate speech produced by sunlight! I have heard a ray of the sun laugh and cough and sing! The dream of the past year has become a reality — the “ Photophone ” is an accomplished fact. I am not prepared at present to go into particulars and can only say that with Mr. Tainter's assistance I have succeeded in preparing crystalline selenium of so low a resistance and so sensitive to light that we have been enabled to perceive variations of light as sounds in the telephone. In this way I have been able to hear a shadow, and I have even perceived by ear the passage of a cloud across the sun's disk. Can Imagination picture what the future of this invention is to be! I dream of so many important and wonderful applications that I cannot bring myself to make known my discovery — until I have demonstrated the practicability of some of these schemes. -
Alexander Graham Bell
WEEK 2 LEVEL 7 Alexander Graham Bell Alexander Graham Bell is the famous inventor of the telephone. Born in Scotland on March 3, 1847, he was the second son of Alexander and Eliza Bell. His father taught students the art of speaking clearly, or elocution, and his mother played the piano. Bell’s mother was almost deaf. His father’s career and his mother’s hearing impairment influenced the course of his career. He became a teacher of deaf people. As a child, Bell didn’t care for school, and he eventually dropped out. He did like to solve problems though. For example, when he was only 12, he invented a new farm implement. The tool removed the tiny husks from wheat grains. After the deaths of his two brothers from tuberculosis, Bell and his parents moved from Europe to Canada in 1870. They thought the climate there was healthier than in Scotland. A year later, Bell moved to the United States. He got a job teaching at the Boston School for Deaf Mutes. © 2019 Scholar Within, Inc. WEEK 2 LEVEL 7 One of his students was a 15-year-old named Mabel Hubbard. He was 10 years older than she was, but they fell in love and married in 1877. The Bells raised two daughters but lost two sons who both died as babies. Bell’s father-in-law, Gardiner Hubbard, knew Bell was interested in inventing things, so he asked him to improve the telegraph. Telegraph messages were tapped out with a machine using dots and dashes known as Morse code. -
Fax Machine (Edited from Wikipedia)
Fax Machine (Edited from Wikipedia) SUMMARY Fax (short for facsimile), sometimes called telecopying or telefax, is the telephonic transmission of scanned printed material (both text and images), normally to a telephone number connected to a printer or other output device. The original document is scanned with a fax machine (or a telecopier), which processes the contents (text or images) as a single fixed graphic image, converting it into a bitmap (a kind of digital image file), and then transmitting it through the telephone system in the form of audio-frequency tones. The receiving fax machine interprets the tones and reconstructs the image, printing a paper copy. Early systems used direct conversions of image darkness to audio tone in a continuous or analog manner. Since the 1980s, most machines modulate the transmitted audio frequencies using a digital representation of the page which is compressed to quickly transmit areas which are all-white or all-black. HISTORY Scottish inventor Alexander Bain worked on chemical mechanical fax type devices and in 1846 was able to reproduce graphic signs in laboratory experiments. He received British patent 9745 on May 27, 1843 for his "Electric Printing Telegraph." Frederick Bakewell made several improvements on Bain's design and demonstrated a telefax machine. The Pantelegraph was invented by the Italian physicist Giovanni Caselli. He introduced the first commercial telefax service between Paris and Lyon in 1865, some 11 years before the invention of the telephone. In 1880, English inventor Shelford Bidwell constructed the scanning phototelegraph that was the first telefax machine to scan any two-dimensional original, not requiring manual plotting or drawing. -
The Great Telecom Meltdown for a Listing of Recent Titles in the Artech House Telecommunications Library, Turn to the Back of This Book
The Great Telecom Meltdown For a listing of recent titles in the Artech House Telecommunications Library, turn to the back of this book. The Great Telecom Meltdown Fred R. Goldstein a r techhouse. com Library of Congress Cataloging-in-Publication Data A catalog record for this book is available from the U.S. Library of Congress. British Library Cataloguing in Publication Data Goldstein, Fred R. The great telecom meltdown.—(Artech House telecommunications Library) 1. Telecommunication—History 2. Telecommunciation—Technological innovations— History 3. Telecommunication—Finance—History I. Title 384’.09 ISBN 1-58053-939-4 Cover design by Leslie Genser © 2005 ARTECH HOUSE, INC. 685 Canton Street Norwood, MA 02062 All rights reserved. Printed and bound in the United States of America. No part of this book may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without permission in writing from the publisher. All terms mentioned in this book that are known to be trademarks or service marks have been appropriately capitalized. Artech House cannot attest to the accuracy of this information. Use of a term in this book should not be regarded as affecting the validity of any trademark or service mark. International Standard Book Number: 1-58053-939-4 10987654321 Contents ix Hybrid Fiber-Coax (HFC) Gave Cable Providers an Advantage on “Triple Play” 122 RBOCs Took the Threat Seriously 123 Hybrid Fiber-Coax Is Developed 123 Cable Modems -
A Timeline of Technology
A Timeline of Technology 10 million Humans make the first tools from stone, wood, antlers, and bones. Tools and machines years ago. 1-2 million Humans discover fire. Biofuels Candles Car engines Jet engines years ago 10,000 BCE Earliest boats are constructed. Ships and boats 8000-9000 Beginnings of human settlements and agriculture. Biofuels BCE Water 6000-7000 Hand-made bricks first used for construction in the Middle East. Bricks BCE 4000 BCE Iron used for the first time in decorative ornaments. Iron and steel 3500 BCE Humans invent the wheel. Tools and machines Wheels and axles c1700 BCE Semites of the Mediterranean develop the alphabet. Digital pens 0-1500 BCE Ancient societies invent some of the first machines for moving water and agriculture. Tools and machines Water 1000 BCE Iron Age begins: iron is widely used for making tools and weapons in many parts of the world. Iron and steel c.150-100 First gear-driven, precision clockwork machine (the Antikythera mechanism) is developed. Clockwork BCE c.50 BCE Roman engineer Vitruvius perfects the modern, vertical water wheel. Turbines 62 CE Hero of Alexandria, a Greek scientist, pioneers steam power. Steam engines 105 CE Ts'ai Lun makes the first paper in China. Paper 27 BCE-395 Romans develop the first, basic concrete called pozzolana. Steel and concrete CE ~600 CE Windmills are invented in the Middle East. Wind turbines 700-900 CE Chinese invent gunpowder and fireworks. Bullets Fireworks 1000 CE ?? Chinese develop eyeglasses by fixing lenses to frames that fit onto people's faces. Lenses 1450 Johannes Gutenberg pioneers the modern printing press, using rearrangeable metal letters called movable type. -
"Awal.A77oaway March 3, 1942
March 3, 1942. V. E. ROSENE 2,274,638 TELAUTOGRAPH SYSTEM Filed Nov. 15, 1939 7 Sheets-Sheet l K-pe% comyzacts 904 306 3/O S747/OW A A/G. / f/6.2 WvewroR M.A. AROSEWE "awal.A77OAway March 3, 1942. v. E. RoseNE . 2,274,638 TELAUTOGRAPH SYSTEM Filed Nov. 15, 1939 7 Sheets-Sheet 2 A/G.4 44 4// 2go t 4OW MAAG/MAZ lEC fill, HE | 484 422 4/2 |, . f HE 408 4O6 E = t S747/OM B /WMEW7OAR M.A.AOSAWA W4-hitA77OARWEY March 3, 1942. V. E. RoseNE 2,274,638 TELAUTOGRAPH SYSTEM Filled Nov. 15, 1939 7 Sheets-Sheet 3 4O6’ 4/3 S747/OW A /WWEM7OAR M.A.AOSAWA - 394.a 77OARWEy March 3, 1942. V. E. ROSENE 2,274,638 TELAUTOGRAPH SYSTEM I Filled Nov. 15, 1939 7 Sheets-Sheet 4 S747/OW A WVEWTOR V.A.AOSEWE "g Ysch. A A77OARWEY March 3, 1942. V. E. RoseNe 2,274,638 TELAUTOGRAPH SYSTEM Filed Nov. 15, 1939 7 Sheets-Sheet 5 76 A/G. 7 77 f, f 7// s L £3,79 729 9 E 74 7s Vf FL A. 4.E. — 72 E. TEEET 725 S747/OW B WWEW7OAR MAAROSAWE A77OARWEy March 3, 1942. V. E. ROSENE 2,274,638 TELAUTOGRAPH SYSTEM - Filed Nov. 15, 1939 7. Sheets-Sheet 6 S A//2 XTNS S.N Nims S7477OW B /W/EW7OAR V.A.AOSAWE As %4. a77OARWAY March 3, 1942. V. E. RoseNE - 2,274,638 TELAUTOGRAPH SYSTEM Filed Nov. 15, 1939 7 Sheets-Sheet 7 s E. -
DP/1982/6/Add.4
co ~u m P0 z ! O, 0 ~ -- 0 m -~ r- m ~0~ m 7’ __--.I 0 0 0 X X Izl I-! X 1.4 I-I L-4 0 i-J ~o 0 H 0 0 1-3 DW1982161Add. English (1) Table I: UNDP: Cost of Subcontreats awarded bY sector of projects and by headquarters of contractor, 1981 . Table 2: URDP: Subcontracts awarded, by contractors’ headquarters and name, cost of contrast and project, 1981 ....... 2 - 22 Table 3: UNDP: Major eqtd~aent orders for proJe~s, by name of supplier, cost of orders, and description of equipment, 1981. ¯ ¯ ¯ ¯ ¯ ¯ ¯ 23 - 37 See easo DP/1982/6/Add. 2 - Basic Pro&T~e Data and DP/1982/6/Add. 3 - Supplementary Pro&Ta~e Data. Sector A~ultuz~, Fozestry 5,700 ~ 7,986 1,374 1,323 1,413 77 21 - - - - 2,740 22,~x and Fisheries Agriculturaldeve- lopmmt s~pozt services - 578 - 804 881 682 382 37 21 - . - - 1,133 4,518 Crops 5,70~/ 595 15 - 48 24 17 40 .... 322 6,761 Livestock - 7,95~/ 570 3% ...... 110 9,024 Fisheries .... - 5 .... 384 389 Forestry - 21 - - 707 ...... 791 1,519 - 1,142 62__2 30 2,589 588 535 IndustrialDevelop- meatstlpport se~ces 5,250 472 - 522 610 129 475 90 - - 125 - 1,175 8,848 Venufacturing industries I, 231 583 - 620 12 30 2,589 459 60 1,264 - 505 665 - 2,062 10,081 Nsturall~souzces - 2,920 -. ~ 44__17 ~ 722 ~ - - 39 460 104 - 2.517 11.959 Land mdwater - 544 - 1,879 143 64 - 765 - 6 - 39 - - - 767 4,207 Mineralzesou~es - 1,633 - I - 135 ... -
Mathematicians Fleeing from Nazi Germany
Mathematicians Fleeing from Nazi Germany Mathematicians Fleeing from Nazi Germany Individual Fates and Global Impact Reinhard Siegmund-Schultze princeton university press princeton and oxford Copyright 2009 © by Princeton University Press Published by Princeton University Press, 41 William Street, Princeton, New Jersey 08540 In the United Kingdom: Princeton University Press, 6 Oxford Street, Woodstock, Oxfordshire OX20 1TW All Rights Reserved Library of Congress Cataloging-in-Publication Data Siegmund-Schultze, R. (Reinhard) Mathematicians fleeing from Nazi Germany: individual fates and global impact / Reinhard Siegmund-Schultze. p. cm. Includes bibliographical references and index. ISBN 978-0-691-12593-0 (cloth) — ISBN 978-0-691-14041-4 (pbk.) 1. Mathematicians—Germany—History—20th century. 2. Mathematicians— United States—History—20th century. 3. Mathematicians—Germany—Biography. 4. Mathematicians—United States—Biography. 5. World War, 1939–1945— Refuges—Germany. 6. Germany—Emigration and immigration—History—1933–1945. 7. Germans—United States—History—20th century. 8. Immigrants—United States—History—20th century. 9. Mathematics—Germany—History—20th century. 10. Mathematics—United States—History—20th century. I. Title. QA27.G4S53 2008 510.09'04—dc22 2008048855 British Library Cataloging-in-Publication Data is available This book has been composed in Sabon Printed on acid-free paper. ∞ press.princeton.edu Printed in the United States of America 10 987654321 Contents List of Figures and Tables xiii Preface xvii Chapter 1 The Terms “German-Speaking Mathematician,” “Forced,” and“Voluntary Emigration” 1 Chapter 2 The Notion of “Mathematician” Plus Quantitative Figures on Persecution 13 Chapter 3 Early Emigration 30 3.1. The Push-Factor 32 3.2. The Pull-Factor 36 3.D. -
Extending Korn's First Inequality to Incompatible Tensor Fields
Poincare´ meets Korn via Maxwell: Extending Korn's First Inequality to Incompatible Tensor Fields Patrizio Neff, Dirk Pauly, Karl-Josef Witsch May 14, 2014 Dedicated to Rolf Leis on the occasion of his 80th birthday Abstract 3 For a bounded domain Ω ⊂ R with Lipschitz boundary Γ and some relatively open Lipschitz subset Γt 6= ; of Γ, we prove the existence of some c > 0, such that c jjT jj 2 3×3 ≤ jjsym T jj 2 3×3 + jjCurl T jj 2 3×3 (0.1) L (Ω;R ) L (Ω;R ) L (Ω;R ) holds for all tensor fields in H(Curl; Ω), i.e., for all square-integrable tensor fields 3×3 3×3 T :Ω ! R with square-integrable generalized rotation Curl T :Ω ! R , having vanishing restricted tangential trace on Γt. If Γt = ;, (0.1) still holds at least for simply connected Ω and for all tensor fields T 2 H(Curl; Ω) which are L2(Ω)-perpendicular to so(3), i.e., to all skew-symmetric constant tensors. Here, both operations, Curl and tangential trace, are to be understood row-wise. For compatible tensor fields T = rv, (0.1) reduces to a non-standard variant of 3 the well known Korn's first inequality in R , namely c jjrvjj 2 3×3 ≤ jjsym rvjj 2 3×3 L (Ω;R ) L (Ω;R ) 1 3 for all vector fields v 2 H (Ω; R ), for which rvn, n = 1;:::; 3, are normal at Γt. On 1 3 arXiv:1203.2744v3 [math.AP] 13 May 2014 the other hand, identifying vector fields v 2 H (Ω; R ) (having the proper boundary conditions) with skew-symmetric tensor fields T , (0.1) turns to Poincar´e's inequality since p 2c jjvjj 2 3 = c jjT jj 2 3×3 ≤ jjCurl T jj 2 3×3 ≤ 2 jjrvjj 2 3 : L (Ω;R ) L (Ω;R ) L (Ω;R ) L (Ω;R ) Therefore, (0.1) may be viewed as a natural common generalization of Korn's first and Poincar´e'sinequality. -
Participating Chain Pharmacies
PARTICIPATING CHAIN PHARMACIES A & P Pharmacy Discount Drug Mart Hy-Vee, Drug Town Network Pharmacy Shoppers Pharmacy ABCO Pharmacy Doc's Drugs Ingles Pharmacy Oncology Pharmacy Services Shoprite Pharmacy Acme Pharmacy Drug Emporium Integrity Healthcare Services P&C Food Market Shurfine Pharmacy Acme, Lucky, Osco, Sav-on Drug Fair Kare Pharmacy Pacmed Clinic Pharmacy Smith's Food & Drug Center Albertson's Pharmacy Duane Reade Kash N' Karry Pharmacy Pamida Pharmacy Snyder Drug Stores Allcare Pharmacy Eagle Pharmacy Kelsey Seybold Clinic Pharmacy Park Nicollet Pharmacy Southern Family Markets Ambulatory Pharmaceutical Services Edgehill Drugs Kerr Drug Pathmark Stadtlander Pharmacy Anchor Pharmacy Express, Thrift, Treasury Keystone Medicine Chest Payless Pharmacy Standard Drug Company Appletree Pharmacy Fagen Pharmacy King Kullen Pharmacy Pediatric Services of America Star Pharmacy Arrow Pharmacy Fairview Pharmacy Kinney Drug's Pharma-Card Statscript Pharmacy Aurora Pharmacy Family Care Pharmacy Kleins Supermarket Pharmacy Pharmacy Plus Steele's Pharmacy B J's Pharmacy Family Drug Klinck, Drug Barn Presbyterian Retail Pharmacy Stop & Shop Pharmacy Bakers Pharmacy Family Fare Klingensmith's Drug Price Chopper Pharmacy Super D Bartell Drugs Family Pharmacy Kmart Pharmacy Price Less Drug Super Food Mart Basha's United Drug Fedco Drug Knight Drugs Price Wise, Piggly Wiggly Super Fresh Pharmacy Bel Air Pharmacy Finast Pharmacy Kohlls Pharmacy Prime Med Pharmacy Super RX Pharmacy Big Bear Pharmacy Food 4 Less Pharmacy Kopp Drug Publix Pharmacy -
Visions of Electric Media Electric of Visions
TELEVISUAL CULTURE Roberts Visions of Electric Media Ivy Roberts Visions of Electric Media Television in the Victorian and Machine Ages Visions of Electric Media Televisual Culture Televisual culture encompasses and crosses all aspects of television – past, current and future – from its experiential dimensions to its aesthetic strategies, from its technological developments to its crossmedial extensions. The ‘televisual’ names a condition of transformation that is altering the coordinates through which we understand, theorize, intervene, and challenge contemporary media culture. Shifts in production practices, consumption circuits, technologies of distribution and access, and the aesthetic qualities of televisual texts foreground the dynamic place of television in the contemporary media landscape. They demand that we revisit concepts such as liveness, media event, audiences and broadcasting, but also that we theorize new concepts to meet the rapidly changing conditions of the televisual. The series aims at seriously analyzing both the contemporary specificity of the televisual and the challenges uncovered by new developments in technology and theory in an age in which digitization and convergence are redrawing the boundaries of media. Series editors Sudeep Dasgupta, Joke Hermes, Misha Kavka, Jaap Kooijman, Markus Stauff Visions of Electric Media Television in the Victorian and Machine Ages Ivy Roberts Amsterdam University Press Cover illustration: ‘Professor Goaheadison’s Latest,’ Fun, 3 July 1889, 6. Cover design: Coördesign, Leiden