General relativity passes cosmic test Einsteins theory holds in extreme gravitational fields

Chalk up another win for "orthodox" scientific theories. General relativity has again passed stringent tests.

General relativity survives gruelling pulsar test — Einstein at least 99.95 percent right

An international research team led by Prof. Michael Kramer of the University of Manchesters Jodrell Bank Observatory, UK, has used three years of observations of the "double pulsar", a unique pair of natural stellar clocks which they discovered in 2003, to prove that Einsteins theory of general relativity - the theory of gravity that displaced Newtons - is correct to within a staggering 0.05%. Their results are published on the 14th September in the journal Science and are based on measurements of an effect called the Shapiro Delay.

The double pulsar system, PSR J0737-3039A and B, is 2000 light-years away in the direction of the constellation Puppis. It consists of two massive, highly compact neutron stars, each weighing more than our own Sun but only about 20 km across, orbiting each other every 2.4 hours at speeds of a million kilometres per hour. Separated by a distance of just a million kilometres, both neutron stars emit lighthouse-like beams of radio waves that are seen as radio "pulses" every time the beams sweep past the Earth. It is the only known system of two detectable radio pulsars orbiting each other. Due to the large masses of the system, they provide an ideal opportunity to test aspects of General Relativity.

The large mass of the pulsars and their proximity to each other is the key thing, resulting in a very strong gravitational field. The binary pulsar system provides an opportunity to check the validity of general relativity under conditions that are more extreme than any studied before.

Shapiro delay can be described as an apparent change in the speed of light in a strong gravitational field. It occurs because spacetime itself is warped in the field, which effectively forces light to travel a larger distance. Since the radio-frequency beam from each pulsar sweeps across Earth at a very precise frequency (22.8 milliseconds for one, 2.8 seconds for the other), like an exceptionally accurate clock, it is possible to predict exactly when the beam should be seen. Any departure from this prediction would be due to the Shapiro delay. The orbital period of the two pulsars around each other is about 2.4 hours. During this period, the distance between the pulsars varies, so the mutual gravitational fields vary correspondingly. This allows the theoretical delay time to be calculated, and the observations match the prediction very well.

This effect is distinct from the time dilation which occurs in a large gravitational field. The dilation causes time intervals to appear to lengthen. So the period of rotation of each pulsar appears to change, and the spectrum of radio waves from each object is redshifted, as the pulsars experience a change in the gravitational field. Here again, the observations match the predictions of general relativity very well.

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Additional information:

Pulsars Gyrations Confirm Einsteins Theory

News article about the research from Science. (Subscription required for full access.)

Tests of General Relativity from Timing the Double Pulsar

The actual research paper from Science. (Subscription required for full access.)

Millisecond Pulsars as Tools of Fundamental Physics

A review paper by Kramer posted to the arXiv in May 2004. It explains the underlying physics in some detail. It also describes the binary pulsar system, which had only recently been discovered.

The Confrontation between General Relativity and Experiment

An expository paper by Clifford M. Will that reviews the status of experimental tests of general relativity and of theoretical frameworks for analyzing them.

General relativity passes cosmic test - Einsteins theory holds in extreme gravitational fields.

News article at Nature.com news. (Subscription required)

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Tags: relativity, general relativity, pulsars, astrophysics

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Green Energy

Green Energy Biography
Sustainable energy is the sustainable provision of energy that meets the needs of the present without compromising the ability of future generations to meet their needs. Technologies that promote sustainable energy include renewable energy sources, such as hydroelectricity, solar energy, wind energy, wave power, geothermal energy, and tidal power, and also technologies designed to improve energy efficiency.
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4 Renewable Energy Resources

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Flaring The Ultimate Gas Guzzler

Next100 has a post on the unnatural practice of natural gas flaring - The Ultimate Gas Guzzler.

If you wanted to help curb global warming by slashing emissions of 400 million tons of CO2 annually, you could:

* take 77 million automobiles off the road, or
* eliminate the wasteful practice of venting and “flaring” (burning) of billions of cubic meters of unused natural gas from production wells.

Much as Id like to choose Plan A on some days as a solution to my morning commute hassles, I have to admit that Plan B sounds more practical. In fact, it sounds like a no-brainer. After all, why hurt the environment by wasting a resource that could instead make money by putting it to productive use?

The staggering waste of gas—and consequent economic opportunity for conservation—was highlighted this week in a study released by GE called Flare Gas Reduction: Recent Global Trends and Policy Considerations. It concludes that with existing technology, some $20 billion in gas could be reclaimed to generate electric power and “yield billions of dollars per year in increased global economic output.”

One of the biggest offenders is the Russian Federation, which flares up to 50 billion cubic feet of natural gas annually due to underinvestment in gas processing and power generation technology.

Runners up include Nigeria, which wastes 15 billion cubic feet per year, and other countries in West Africa, which together burn off some 10 billion cubic feet. Fortunately, Nigeria plans major investments to capture and turn its flared gas into a valuable asset.

Wasteful flaring takes place even in the United States. In North Dakota, for example, roughly a quarter of all gas produced from oil wells is simply burned off.

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The internet v the world part 1 gatekeepers lose control as we connect

Crikeys Bernard Keane has some thoughts on the challenge to gatekeeping institutions posed by the internet - The internet v the world part 1: gatekeepers lose control as we connect .

Here are some scenes from the internet in the last decade of the twentieth century and the first of the 21st, in no particular order.

* The internet versus music and movies. The digitisation of audio-visual content and higher internet bandwidth enables mass downloading of music, movies and television programming entirely outside the legal copyright system. In Australia, much of it is driven by the FTA television networks’ refusal to screen foreign programs for many months after they’ve screened in the US. The response of copyright owners and media companies is to prosecute individuals, websites or companies that download illegally, or facilitate downloading, and convince governments to impose new, often draconian, copyright laws. Their efforts are futile. About 25% of global internet traffic is estimated to be file sharing, nearly all of it illegal.

* The internet versus lawyers. Lawyers in jurisdictions across the world become increasingly concerned about jurors using the internet to find out about cases. Judges take to threatening jurors with contempt of court if they breach agreements about using the internet. In 2008, a Victorian judge demands the suppression of an episode of Underbelly. As soon as the banned episode is broadcast elsewhere, it is available online and downloaded thousands of times. In 2009, a judge orders Australian websites to take over 1500 articles offline about an individual on the basis that they will prejudice a trial jury. The material remains easily accessible even after removal by the sites in question.

* The internet versus gambling opponents. Moral panic over gambling and pressure from casinos prompts the Australian Government to ban online gambling in 2001. According to the Productivity Commission, the ban fails to prevent continued growth in online gambling at rates similar to other countries. The ban ensures Australians’ money goes to poorly-regulated foreign sites and not safer local sites and Australian taxpayers.

* The internet versus government secrecy. The website Cryptome began publishing classified and confidential government information in 1996. Similar sites like Cartome, Eyeball Series and Cryptome CN also offer other types of information governments want suppressed. Cryptome’s founders claim FBI harassment, the site has its server capacity removed and companies like PayPal refuse to enable contributions to the site. But as WikiLeaks will demonstrate, the harassment appears to have no noticeable impact on the release of material.

* The internet versus transnationals. In October 2009, the transnational energy company Trafigura, which has successfully used the UK courts to suppress reporting of evidence it released toxic waste in Cote dIvoire, obtains a "superinjunction" against the Guardian on the same issue. But "Trafigura" becomes a trending topic on Twitter, and a number of websites and WikiLeaks publish material on the case. The company abandons its attempts to suppress efforts to expose it.

* The internet versus journalists. Some Australian p olitical journalists, angry at criticism of their coverage of the 2010 election, lash out at "parasites", "free riders" and "armchair critics" online. "Just let the professionals do their job" demands one on Twitter. But the editor of The Australian goes further. Angry that online critics are routinely deriding the paper’s partisanship and anti-science stance on climate change, he threatens to sue an academic over tweets made about a presentation at a journalism conference -- though not the presenter herself, a former journalist at his own paper -- and boasts about bringing his lawyers into the matter. His Media Editor then threatens to report another academic to police over a Twitter comment. The result is extensive coverage of the original presentation here and overseas.

* The internet versus the Australian Government. In response to WikiLeaks releasing US diplomatic cables, the Australian Prime Minister labels the act "illegal" and her Attorney-General talks about measures to prevent the release of national security material in the media. He writes to mainstream media editors with the goal of developing a protocol to do so. Later, Australian police advise that WikiLeaks has not broken any Australian laws, and the Prime Minister is forced to carefully parse her claim about illegality.

* The internet versus Big Retail. Australia’s major retailers, used to earning oligopoly profits, are unhappy Australians are using the internet to shop online at overseas sites. They demand the Government take "decisive action" in the form of higher taxes to deter consumers and protect their profits.

The common theme across these examples is that the gatekeepers and the privileged intermediaries of late twentieth century Western economies -- politicians, lawyers, the mainstream media, large corporations -- are threatened by the connectedness that the internet enables.

Humans are, to nick a phrase from David Attenborough, compulsive communicators. The urge to converse, debate, joke, fight, trade, play and form relationships with each other is hard-wired into us. And the internet dramatically expands the community within which we can do that, from one constrained by geography to one only constrained by technology.

And it directly undermines the power of those who want to regulate that interaction, or profit from it. Governments that want to police it. The media that profits by connecting us. The corporations that rely on consumers knowing less than they do. The courts that regard jurors as easily-swayed fools who need to be treated like mushrooms. All now confront interconnectedness on a scale far greater than ever seen before, with far fewer opportunities to regulate or exploit it.

But the gatekeepers and intermediaries are unwilling to let their power go easily, even as it slips away from them. And they reflexively resort to litigation, regulation and prohibition to maintain their power.

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Carnegie Wave raises funds to fast track CETO 6

RNE has an update on wave power company Carnegie Wave Energy - Carnegie Wave raises funds to fast-track CETO 6.

ASX-listed ocean energy developer Carnegie Wave Energy Limited has completed a capital raising of $4 million, part of which will go towards fast-tracking the design of its CETO 6 project – the WA-based company’s next generation CETO unit, which is expected to have at least twice the capacity of the CETO 5 unit. Carnegie’s CETO 5 is being manufactured for the Perth Wave Energy Project, which once completed will be Australia’s first commercial-scale CETO grid-connected wave energy system.

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Your E Book Is Reading You

The WSJ has an article on the data mining possibilities created by ebooks - Your E-Book Is Reading You.

In the past, publishers and authors had no way of knowing what happens when a reader sits down with a book. Does the reader quit after three pages, or finish it in a single sitting? Do most readers skip over the introduction, or read it closely, underlining passages and scrawling notes in the margins? Now, e-books are providing a glimpse into the story behind the sales figures, revealing not only how many people buy particular books, but how intensely they read them.

For centuries, reading has largely been a solitary and private act, an intimate exchange between the reader and the words on the page. But the rise of digital books has prompted a profound shift in the way we read, transforming the activity into something measurable and quasi-public.

The major new players in e-book publishing—Amazon, Apple and Google—can easily track how far readers are getting in books, how long they spend reading them and which search terms they use to find books. Book apps for tablets like the iPad, Kindle Fire and Nook record how many times readers open the app and how much time they spend reading. Retailers and some publishers are beginning to sift through the data, gaining unprecedented insight into how people engage with books.

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Merry Christmas

Its been something of a slow year here at Peak Energy but Id like to thank you all for the emails and comments received over the year.

Hopefully next year will be less of a grind for me personally and things will be a bit more productive here !

Merry Christmas to you all...

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How To Build Wind Generator

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Renewable And Non Renewable Energy Resources

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