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Introduction to the Physics of Waves - Free eBook Share

Introduction to the Physics of Waves - Free eBook Share | Alternative Technology | Scoop.it
eBook Free Download: Introduction to the Physics of Waves | PDF, EPUB | ISBN: 0521197570 | 2012-12-28 | English | PutLocker

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Fox eBook's curator insight, July 26, 2013 10:17 PM

Balancing concise mathematical analysis with the real-world examples and practical applications that inspire students, this textbook provides a clear and approachable introduction to the physics of waves. The author shows through a broad approach how wave phenomena can be observed in a variety of physicalsituations and explains how their characteristics are linked to specific physical rules, from Maxwell’s equations to Newton’s laws of motion. Building on the logic and simple physics behind each phenomenon, the book draws on everyday, practical applications of wave phenomena, ranging from electromagnetism to oceanography, helping to engage students and connect core theory with practice. Mathematical derivations are kept brief and textual commentary provides a non-mathematical perspective. Optional sections provide more examples along with higher-level analyses and discussion. This textbook introduces the physics of wave phenomena in a refreshingly approachable way, making it ideal for first- and second-year undergraduate students in the physical sciences.

Table of Contents

1 The essence of wave motion
2 Wave equations and their solution
3 Further wave equations
4 Sinusoidal waveforms
5 Complex wavefunctions
6 Huygens wave propagation
7 Geometrical optics
8 Interference
9 Fraunhofer diffraction
10 Longitudinal waves
11 Continuity conditions
12 Boundary conditions
13 Linearity and superpositions
14 Fourier series and transforms
15 Waves in three dimensions
16 Operators for wave motions
17 Uncertainty and quantum mechanics
18 Waves from moving sources
19 Radiation from moving charges
Appendix: Vector mathematics

John Myrick's curator insight, August 23, 2013 10:18 PM

A free textbook, cool stuff!

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Replacing an Engine’s Spark Plugs with Lasers – That Sounds like the Stuff of Genius

Replacing an Engine’s Spark Plugs with Lasers – That Sounds like the Stuff of Genius | Alternative Technology | Scoop.it

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Rescooped by Karl Fildi from A WORLD OF CONPIRACY, LIES, GREED, DECEIT and WAR
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Stuff They Don't Want You To Know - Project Blue Beam

For decades conspiracy theorists have accused the government of hiding evidence of aliens or imminent world disasters, but could the governments of the world...

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Is our universe merely one of billions? Evidence of the existence of 'multiverse' revealed for the first time by cosmic map

Is our universe merely one of billions? Evidence of the existence of 'multiverse' revealed for the first time by cosmic map | Alternative Technology | Scoop.it

Scientists studying radiation data from the European Space Agency's Planck spacecraft have found unexpected anomalies that they say can only be explained by the existence of other universes and their pull.

 

The first 'hard evidence' that other universes exist has been found by scientists. Cosmologists studying a map of the universe from data gathered by the Planck spacecraft have concluded that it shows anomalies that can only have been caused by the gravitational pull of other universes. The map shows radiation from the Big Bang 13.8billion years ago that is still detectable in the universe - known as cosmic microwave radiation.


Scientists had predicted that it should be evenly distributed, but the map shows a stronger concentration in the south half of the sky and a 'cold spot' that cannot be explained by current understanding of physics.

Laura Mersini-Houghton, theoretical physicist at the University of North Carolina at Chapel Hill, and Richard Holman, professor at Carnegie Mellon University, predicted that anomalies in radiation existed and were caused by the pull from other universes in 2005.


Now that she has studied the Planck data, Dr. Mersini-Houghton believes her hypothesis has been proven. Her findings imply there could be an infinite number of universes outside of our own. She said: 'These anomalies were caused by other universes pulling on our universe as it formed during the Big Bang. 'They are the first hard evidence for the existence of other universes that we have seen.'

 

Although some scientists remain sceptical about the theory of other universes, these findings may be a step towards changing views on physics. The European Space Agency, which runs the £515million Planck telescope, said: 'Because precision of Planck’s map is so high, it made it possible to reveal some peculiar unexplained features that may well require new physics to be understood.'


Cambridge professor of theoretical physics Malcolm Perry told the Sunday Times that the findings could be real evidence of the existence of other universes. While George Efstathiou, professor of astrophysics at the university, told the newspaper: 'Such ideas may sound wacky now, just like the Big Bang theory did three generations ago. But then we got evidence and now it has changed the whole way we think about the universe.'


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Final Frontier? ‘Star Trek' Tech Becoming Reality (Op-Ed)

Final Frontier? ‘Star Trek' Tech Becoming Reality (Op-Ed) | Alternative Technology | Scoop.it

"Vessels as large as the Enterprise will one day be assembled in orbit or beyond Earth orbit through advances in robotics and 3D printing. Using the raw materials of asteroids, automated machinery requiring limited interaction from human beings will assemble immense structures such as solar power satellites, space stations and interstellar starships far from the surface of the Earth. Large 3D printers will build our future moon bases and allow for the construction of massive structures on the surface of other planets and deep in outer space."


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Radiation Fears Shouldn't Hold Back Mars Colonization (Op-Ed)

Radiation Fears Shouldn't Hold Back Mars Colonization (Op-Ed) | Alternative Technology | Scoop.it

Mars One aims to establish a permanent human settlement on Mars in 2023, requiring no return mission.

 

The absence of a return mission reduces the radiation exposure from galactic cosmic rays. These cosmic rays are hard to shield against without the use of a prohibitive shielding mass, which would require more than 10 times the standard spacecraft shielding. Reducing the time spent traveling through space — and, thus, the exposure from the cosmic rays — is significant, as these rays are the source of 95 percent of the radiation exposure, according to a recent paper published May 31 in the journal Science.

 

 


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Tesla to introduce all-wheel-drive Model S in 2014? - Autoblog

Tesla to introduce all-wheel-drive Model S in 2014? - Autoblog | Alternative Technology | Scoop.it
Tesla reportedly will produce an all-wheel-drive Model S before the Model X SUV is released in 2014.
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Swiss Space Program Targets Thousands Of Pieces Of 'Orbital Debris'

Swiss Space Program Targets Thousands Of Pieces Of 'Orbital Debris' | Alternative Technology | Scoop.it

"More than 21,000 orbital debris larger than 10 cm are known to exist. The estimated population of particles between 1 and 10 cm in diameter is approximately 500,000. The number of particles smaller than 1 cm exceeds 100 million."

 

Countries pursue space programs for a variety of reasons — to communicate faster; to track the weather; to spy on one another; to prove they, too, can put something in space. Leave it to Switzerland to launch a project that has the simple goal of keeping things tidy. As Global Post reports, the Swiss Space Center's CleanSpace One project is the start of an effort to clean up some of the space junk currently orbiting the Earth.

 

Enter the Swiss. They've only been putting things into orbit for a few years now, but now that they've gotten a look at the Earth's debris field, they've decided to do something about it — like playing Felix to the rest of the world's Oscar. GP's Thomas Mucha writes, "In other words, they're planning to launch giant vacuum cleaners into space to suck up debris, and then safely send it back down to earth."

 

At the website for Switzerland's Federal Polytechnic School of Lausanne, the process is explained in more technical detail: "After its launch, the cleanup satellite will have to adjust its trajectory in order to match its target's orbital plane. To do this, it could use a new kind of ultra-compact motor designed for space applications that is being developed in EPFL laboratories. When it gets within range of its target, which will be traveling at 28,000 km/h at an altitude of 630-750 km, CleanSpace One will grab and stabilize it – a mission that's extremely dicey at these high speeds, particularly if the satellite is rotating."


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The Next Wave of Manufacturing: Human Organs

The Next Wave of Manufacturing: Human Organs | Alternative Technology | Scoop.it
With 3-D bioprinting, companies are fast approaching the time when they can manufacture implantable organs. (RT @sorenkaplan: Talk about a Disruptive Innovation!

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Connect's curator insight, August 23, 2013 11:44 AM

Une industrie qui pourra certainement mieux légitimer ces technologies que celle des armes…

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Dyson sphere hunt using Kepler data - Looking for Kardashev Type II civilizations

Dyson sphere hunt using Kepler data - Looking for Kardashev Type II civilizations | Alternative Technology | Scoop.it

Freeman Dyson hypothesized the vast structures over fifty years ago that could ring or completely enclose their parent star. Such structures, the work of a Kardashev Type II civilization — one capable of drawing on the entire energy output of its star — would power the most power-hungry society and offer up reserves of energy that would support its continuing expansion into the cosmos, if it so chose.

 

Marcy’s plan is to look at a thousand Kepler systems for telltale evidence of such structures by examining changes in light levels around the parent star. Interestingly, the grant of $200,000 goes beyond the Dyson sphere search to look into possible laser traffic among extraterrestrial civilizations. Says Marcy: "Technological civilizations may communicate with their space probes located throughout the galaxy by using laser beams, either in visible light or infrared light. Laser light is detectable from other civilizations because the power is concentrated into a narrow beam and the light is all at one specific color or frequency. The lasers outshine the host star at the color of the laser."

 

The topic of Dyson spheres calls Richard Carrigan to mind. The retired Fermilab physicist has studied data from the Infrared Astronomical Satellite (IRAS) to identify objects that radiate waste heat in ways that imply a star completely enclosed by a Dyson sphere. This is unconventional SETI in that it presumes no beacons deliberately announcing themselves to the cosmos, but instead looks for signs of civilization that are the natural consequences of physics.

 

Carrigan has estimated that a star like the Sun, if enclosed with a shell at the radius of the Earth, would re-radiate its energies at approximately 300 Kelvin. Marcy will turn some of the thinking behind what Carrigan calls ‘cosmic archaeology’ toward stellar systems we now know to have planets, thanks to the work of Kepler. Ultimately, Carrigan’s ‘archaeology’ could extend to planetary atmospheres possibly marked by industrial activity, or perhaps forms of large-scale engineering other than Dyson spheres that may be acquired through astronomical surveys and remain waiting in our data to be discovered. All this reminds us once again how the model for SETI is changing.


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Hidden alien footprints in Kepler Data? Hunting aliens by searching for megastructures

Hidden alien footprints in Kepler Data? Hunting aliens by searching for megastructures | Alternative Technology | Scoop.it

In the search for intelligent extraterrestrials, scientists listen for incoming radio signals and they hunt for Earth-like planets. Some scientists are also looking for megastructures constructed by aliens.

NASA’s Kepler space telescope searches for planets using the transit method–Kepler’s sensors detect dips in brightness caused when an alien planet passes in front of its star from Kepler’s perspective. And this same method is used by scientists searching the universe for alien megastructures.

 

Astronomer Geoff Marcy, who was recently appointed to the new Watson and Marilyn Alberts Chair for SETI (Search for Extraterrestrial Intelligence) at the University of California at Berkeley, was awarded a grant to hunt for evidence of Dyson spheres using Kepler data. A Dyson sphere is a theoretical megastructure envisioned by theoretical physicist Freeman Dyson consisting of a giant array of solar panels that would surround a star to harvest its energy.

 

Scientists hunting alien megastructures are also looking for theoretical structures known as ringworlds. Universe Todayexplains that ringworlds “would consist of a giant ring in orbit around a star, constructed comfortably inside the star’s habitable zone.”

 

Whether alien megastructures actually exist is unknown. But as Universe Today points out, “The possibility alone is exciting enough to make it worth continuing to look.”


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Mars lost lost its magnetic field billions of years ago, killing all life, if any ever existed there

Mars lost lost its magnetic field billions of years ago, killing all life, if any ever existed there | Alternative Technology | Scoop.it

The discovery by NASA rover Curiosity of evidence that water once flowed on Mars - the most Earth-like planet in the solar system - should intensify interest in what the future could hold for mankind. The only thing stopping Earth having a lifeless environment like Mars is the magnetic field that shields us from deadly solar radiation and helps some animals migrate, and it may be a lot more fragile and febrile than one might think.

 

Scientists say Earth's magnetic field is weakening and could all but disappear in as little as 500 years as a precursor to flipping upside down. While the effects are hard to predict, the consequences may be enormous. The loss of the magnetic field on Mars billions of years ago put an end to life on the planet if there ever was any, scientists say.

 

Mac Niocaill said Mars probably lost its magnetic field 3.5-4.0 billion years ago, based on observations that rocks in the planet's southern hemisphere have magnetization. The northern half of Mars looks younger because it has fewer impact craters, and has no magnetic structure to speak of, so the field must have shut down before the rocks there were formed - which would have been about 3.8 billion years ago. "With the field dying away, the solar wind was then able to strip the atmosphere away, and you would also have an increase in the cosmic radiation making it to the surface," he said.


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The Best Way to Find Aliens: Look for Their Solar Power Plants

The Best Way to Find Aliens: Look for Their Solar Power Plants | Alternative Technology | Scoop.it

A team of astronomers is now looking for Dyson Spheres, massive star-scale solar power plants that extraterrestrial hunters hope alien civilizations employ.

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Dyson Spheres: The Ultimate Energy Shell Game : Discovery News

Dyson Spheres: The Ultimate Energy Shell Game : Discovery News | Alternative Technology | Scoop.it
Need 400 trillion trillion watts of solar energy? No problem! Wrap the sun inside a Dyson Sphere.

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Massive charged scalar field in the Kerr-Newman background

Massive charged scalar field in the Kerr-Newman background | Alternative Technology | Scoop.it
So far analysis of the quasinormal spectrum of a massive charged scalar field in the black hole background has been limited by the regime of small μM and qQ, where μ, q (M,Q) are mass and charge of the field (black hole).
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