B. D. H. Tellegen was the first to point out (1952, 1953) the generality and wide-ranging usefulness of the theorem that bears his name. Nevertheless, the theorem is still not as widely known as its utility warrants. The authors of this monograph set out to correct this neglect, noting that "There is hardly a basic network theorem that cannot be proved by invoking Tellegen's theorem. The simplicity and generality of the theorem make it attractive pedagogically, and its ability to generalize known results and lead to new results indicates its research value. This theorem definitely should be in every circuit designer's kit of tools." Tellegen's theorem is unusual in that it depends solely upon Kirchhoff's laws and the topology of the network. The theorem thus applies to all electrical networks that obey Kirchhoff's laws, whether linear or nonlinear, time-invariant or time-variant, reciprocal or nonreciprocal, passive or active, single-valued or multiple-valued, hysteretic or nonhysteretic. The excitation is arbitrary—it may be sinusoidal, exponential, periodic, transient, or random. Also, the initial conditions may be arbitrarily chosen. The modern interest in nonlinear and time-variant networks gives Tellegen's theorem a special new importance, because it is one of the very few general theorems that apply to such networks. To demonstrate its range of applications and the theorem's great power in the derivation of other basic and important theorems about electrical networks (and the extent that these other theorems are special cases of Tellegen's), the authors have collected more than 100 such theorems and have shown that they can be proved from Tellegen's theorem. Most of these were known before; but some are extended in their range of validity, and a few are new. (Apart from Tellegen's theorem, this collection of theorems is valuable in its own right.) Applications are given to automated network synthesis and to nonlinear, time-varying, switching, nonreciprocal, and other networks—all the major areas of network theory are covered. In addition, extensions of the theorem to other physical systems are discussed, including applications to the electromagnetic field, electron beams and plasmas, and quantum mechanics. The theorem is proved in its most general form thus far known. In addition, two weaker forms that have useful properties for certain applications are presented. In these weaker forms, the theorem applies to voltages, currents, and wave (or scattering) variables. The use of wave variables in Tellegen's theorem is believed to be new. Oliver Heaviside used a version of the theorem in 1883 to establish a specific result, and others have used its equivalent in a limited range of applications. Others (Weyl, 1923; Bott, 1949) have derived highly abstract and mathematical versions without regard to applications. But Tellegen was the first to devote a full paper to the subject and the first to grasp the theorem's general importance and applicability. In a similar way, the authors of this monograph are the first to devote a book to the subject and the first to collect (or newly present) all of the most important applications of the theorem in the hope of bringing it into the common currency it deserves.

Tellegen's Theorem and Electrical Networks

Engineering & Transportation

Spencer, Robert

Penfield, Paul

Duinker, S.

Engineering

Mit Pr

Persevere is a lonely little biplane. He used to carry passengers, but now they all travel on the bigger planes. Most of the jets look down on little Persevere, but his friend Claude, a big airliner, tries to cheer him up. It's Claude, too, who remembers Persevere when there's a problem that the large aircraft can't deal with. A rescue flight must be flown to a remote mountain airstrip - but the huge jets are too big and clumsy. For 'Persey', though, the mission is just right. His old pilot, Joe, comes out of retirement to fly him, and after a good check-up by the mechanic they set off. The mountain valleys become tighter and tighter, and the weather worsens, and the flight becomes more and more nerve-wracking; but at last Persey manages to manoeuvre down to the little landing strip. They collect their passenger, and set off on the tricky flight back. Persey and Joe return home heroes. The other aircraft crowd around to cheer, and the story of the brave little biplane's courage and determination is taken up by the media. Best of all, a new future is assured for Persey, for he is taken on by the wealthy owner of Claude's airline. He has proved himself, he is wanted: Persevere is happy at last. A tale of sadness turned to joy, of the underdog's perseverance winning through, this book will capture the imagination, stimulate the emotions, and fuel the will to win through of children everywhere. The text is colourfully illustrated and technically correct, and with the ever-increasing popularity of air shows and museums, visited by more and more youngsters, a lasting market is ensured for this attractive little volume.

Bravo Persevere!

Children's Books

Cars, Trains & Things That Go

Lutterworth Press

Islam Unveiled: Disturbing Questions about the World's Fastest Growing Faith

Robert Spencer probes the Qur’an and other sacred documents to find out why the world’s fastest growing faith tends to arouse extremism. A student of the religion for the last twenty years, he brings a critical sensibility to this brave, searching work.

Islam Unveiled: Disturbing Questions About the World's Fastest Growing Faith, Library Edition

History

Blackstone Pub

Islam Unveiled

Did you know that Islam teaches that Muslims must wage war to impose Islamic law on non-Muslim states, or that American Muslim groups are engaged in a huge cover-up of Islamic doctrine? These and other "politically incorrect" facts are revealed by Robert Spencer in The Politically Incorrect Guide to Islam (and the Crusades).

Politically Incorrect Guide to Islam (and the Crusades) (Library Edition)

Politics & Social Sciences

Philosophy

Blackstone Audiobooks

Muhammad: a frank look at his influential (and violent) life and teachingsIn The Truth about Muhammad, New York Times bestselling author and Islam expert Robert Spencer offers an honest and telling portrait of the founder of Islam-perhaps the first such portrait in half a century-unbounded by fear and political correctness, unflinching, and willing to face the hard facts about Muhammad's life that continue to affect our world today.From Muhammad's first "revelation" from Allah (which filled him with terror that he was demonpossessed) to his deathbed (from which he called down curses upon Jews and Christians), it's all here-told with extensive documentation from the sources that Muslims themselves consider most reliable about Muhammad.Spencer details Muhammad's development from a preacher of hellfire and damnation into a political and military leader who expanded his rule by force of arms, promising his warriors luridly physical delights in Paradise if they were killed in his cause. He explains how the Qur'an's teaching on warfare against unbelievers developed-with constant war to establish the hegemony of Islamic law as the last stage.Spencer also gives the truth about Muhammad's convenient "revelations" justifying his own licentiousness; his joy in the brutal murders of his enemies; and above all, his clear marching orders to his followers to convert non-Muslims to Islam-or force them to live as inferiors under Islamic rule.In The Truth about Muhammad, you'll learn- The truth about Muhammad's multiple marriages (including one to a nine-year-old) - How Muhammad set legal standards that make it virtually impossible to prove rape in Islamic countries - How Muhammad's example justifies jihad and terrorism - The real "Satanic verses" incident (not the Salman Rushdie version) that remains a scandal to Muslims - How Muhammad's faulty knowledge of Judaism and Christianity has influenced Islamic theology--and colored Muslim relations with Jews and Christians to this day.Recognizing the true nature of Islam, Spencer argues, is essential for judging the prospects for largescale Islamic reform, the effective prosecution of the War on Terror, the democracy project in Afghanistan and Iraq, and immigration and border control to protect the United States from terrorism.All of which makes it crucial for every citizen (and policymaker) who loves freedom to read and ponder The Truth about Muhammad

Truth About Muhammad: Founder of the World's Most Intolerant Religion

Religion & Spirituality

Islam

Spencer offers a telling portrait of the founder of Islam, detailing Muhammads development from a preacher of hellfire and damnation into a political and military leader who expanded his rule by force of arms and lurid promises.

The Truth about Muhammad: Founder of the World's Most Intolerant Religion

The Truth About Muhammad: Founder of the World's Most Intolerant Religion

Traces the founder of Islam's rise to political and military power, focusing on controversial aspects of the prophet's beliefs and actions without adhering to political correctness.

Literature & Fiction

In The Truth about Muhammad, New York Times bestselling author and Islam expert Robert Spencer offers a telling portrait of the founder of Islam--perhaps the first such portrait in half a century--unbounded by fear and political correctness, unflinching, and willing to face the hard facts about Muhammad's life that continue to affect our world today. Spencer details Muhammad's development from a preacher of hellfire and damnation into a political and military leader who expanded his rule by force of arms, promising his warriors luridly physical delights in paradise if they were killed in his cause. He explains how the Qur'an's teachings on warfare against unbelievers developed, with constant war to establish the hegemony of Islamic law as the last stage. Spencer also gives the truth about Muhammad's convenient "revelations" justifying his own licentiousness; his joy in the brutal murders of his enemies; and above all, his clear marching orders to his followers to convert non-Muslims to Islam--or force them to live as inferiors under Islamic rule.

Business & Money

The Politically Incorrect Guide to Islam

The Politically Incorrect Guide to Islam (and the Crusades)

A New York Times Bestseller. The Politically Incorrect Guide to Islam (and the Crusades) takes you on a fast-paced tour that will give you all the information you need to understand the nature of the global conflict America faces today.

The Politically Incorrect Guide to Islam: And the Crusades

See the best price to sell, buy, or rent books by Spencer, Robert. BookScouter helps to compare book prices from 25+ online bookstores and 30+ buyback vendors with a single search.

Books by Spencer, Robert

See the best price to sell, buy, or rent books by Spencer, Robert. BookScouter helps to compare book prices from 25+ online bookstores and 30+ buyback vendors with a single search.

Tellegen's Theorem and Electrical Networks

Bravo Persevere!

Islam Unveiled: Disturbing Questions About the World's Fastest Growing Faith, Library Edition

Islam Unveiled

Politically Incorrect Guide to Islam (and the Crusades) (Library Edition)

Truth About Muhammad: Founder of the World's Most Intolerant Religion

The Truth about Muhammad: Founder of the World's Most Intolerant Religion

The Truth about Muhammad: Founder of the World's Most Intolerant Religion

The Truth about Muhammad: Founder of the World's Most Intolerant Religion

The Politically Incorrect Guide to Islam: And the Crusades