Source: http://feeds.sciencedaily.com/~r/sciencedaily/most_popular/~3/B_iIoHsvtFM/130730193535.htm
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মঙ্গলবার, ৩০ জুলাই, ২০১৩
Controlling contagion by restricting mobility: In the face of an epidemic, even moderate travel restrictions would slow contagion
[unable to retrieve full-text content]In an epidemic or a bioterrorist attack, the response of government officials could range from a drastic restriction of mobility -- imposed isolation or total lockdown of a city -- to moderate travel restrictions in some areas or simple suggestions that people remain at home. Deciding to institute any measure would require officials to weigh the costs and benefits of action, but at present there's little data to guide them on the question of how disease spreads through transportation networks. However, a new study comparing contagion rates in two scenarios -- with and without travel restrictions -- shows that even moderate measures of mobility restriction would be effective in controlling contagion in densely populated areas with highly interconnected road and transit networks.
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Originally posted 2013-05-18 05:51:34.
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How Giant Black Holes Spin: New Twist Revealed
A newly discovered way to determine the spin of monster black holes could help shed light on the evolution of these bizarre objects and the galaxies they anchor.
Astronomers watched as a black hole?that sits at the core of a spiral galaxy 500 million light-years from Earth gobbled up gas and dust from its surrounding accretion disk. They were able to measure the distance between the inner edge of the disk and the black hole, which, in turn, allowed them to estimate the black hole's spin.
?If a black hole is spinning, it drags space and time with it, and that drags the accretion disk, containing the black hole's food, closer towards it," study lead author Chris Done, of the University of Durham in the United Kingdom, said in a statement. "This makes the black hole spin faster ? a bit like an ice skater doing a pirouette." [Gallery: Black Holes of the Universe]
Researchers said the technique could help astronomers address broad questions about galactic evolution, which is intimately tied to the growth and activity of the supermassive black holes?that lurk at the heart of most, if not all, galaxies.
"Understanding this connection between stars in a galaxy and the growth of a black hole, and vice versa, is the key to understanding how galaxies?form throughout cosmic time," Done said.
Done and his colleagues used the European Space Agency's XMM-Newton satellite to study the distant supermassive black hole, which contains as much mass as 10 million suns.
This black hole blasts out prodigious amounts of energy as it feeds on the material in its accretion disk. XMM-Newton observed this output in optical, ultraviolet and X-ray wavelengths, enabling the astronomers to measure how far the disk sits from the black hole.
Astronomers have calculated the spin of supermassive black holes before. In February, for example, a different research team determined the rotation rate of the black hole at the center of a spiral galaxy called NGC 1365. That group inferred the spin speed by?measuring the distortion of high-energy light emitted by iron atoms in the accretion disk.
It's tough to describe black-hole spin rates because they don't really translate into familiar terms, such as miles per hour. For example, the NGC 1365 team, which used observations by XMM-Newton and NASA's NuStar spacecraft, found the black hole's rotation rate to be 84 percent of the maximum allowed by Einstein's theory of general relativity.
In the new study, Done and his colleagues estimated that the black hole found 500 million light-years away ? which is powering a superluminous "active galactic nucleus" known as PG1244+026 ? has a relatively low spin rate.
"This contrasts with the recent X-ray determinations of (close to) maximal black hole spin in other [similar galaxies] based on relativistic smearing of the iron profile," the researchers wrote in the study, which was published online today (July 29) in the journal Monthly Notices of the Royal Astronomical Society.
"Better high-energy data are required in order to determine whether this new method gives a spin estimate which is consistent with that derived from the iron line, or whether it instead reveals a lack of understanding of disc continuum emission and/or of disc reflection," Done and his team wrote.
Follow Mike Wall on Twitter?@michaeldwall?and?Google+.?Follow us @Spacedotcom, Facebook?or Google+. Originally published on?SPACE.com.
Copyright 2013 SPACE.com, a TechMediaNetwork company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.Source: http://news.yahoo.com/giant-black-holes-spin-twist-revealed-230756269.html
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Diets lacking omega-3s lead to anxiety, hyperactivity in teens: Generational omega-3 deficiencies have worsening effects over time
[unable to retrieve full-text content]Diets lacking omega-3 fatty acids -- found in foods like wild fish, some eggs, and grass-fed livestock -- can have worsened effects over consecutive generations, especially affecting teens, according to a new study.
Source: http://feeds.sciencedaily.com/~r/sciencedaily/living_well/~3/gFI2WjyRsY0/130729133525.htm
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রবিবার, ২৮ জুলাই, ২০১৩
Factbox: Hacking talks that got axed
By Jim Finkle
(Reuters) - Hacking experts and product manufacturers have sometimes been at odds over whether the disclosure of security vulnerabilities is helpful, or harmful, to the public interest.
Lawsuits, or even the threat of legal action, have resulted in the cancellation of some hacking presentations in recent years. Here are some examples, ahead of this week's Black Hat and Def Con hacking conferences in Las Vegas:
2005 - Cisco Systems Inc persuaded security firm Internet Security Systems to pull a discussion on hacking routers by researcher Michael Lynn at the Black Hat annual hacking conference in Las Vegas.
On the eve of the conference, Black Hat organizers had workers tear out Lynn's presentation materials from a printed handbook given out to thousands of attendees. Lynn gave the talk anyway, was fired by ISS, and an injunction was obtained to block further public discussion.
2007 - Security firm IOActive Inc pulled a talk that researcher Chris Paget was due to present at Black Hat DC on bugs in radio-frequency identification, or RFID, technology, saying it was pressured to do so by RFID technology firm HID Global Corp.
2008 - Three MIT undergrads canceled a Def Con talk in Las Vegas on hacking the "Charlie Card" payment cards for Boston's subway system after an injunction by a U.S. federal court. A judge later rescinded the order, allowing them to go public.
2013 - Three European computer scientists canceled a talk on hacking the locks of luxury cars at a prestigious U.S. academic conference to be held in August, after Volkswagen AG obtained a restraining order from a British court.
Their paper, which was titled "Dismantling Megamos Crypto: Wirelessly Lockpicking a Vehicle Immobilizer," identified ways to hack into the lock systems of luxury cars including Porsches, Audis, Bentleys and Lamborghinis.
(Reporting by Jim Finkle; Additional reporting by Christine Murray in London; Editing by Peter Cooney)
Source: http://news.yahoo.com/factbox-hacking-talks-got-axed-130811884.html
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Ford : Mustang Convertible 1965 Ford Mustang Convertible F Code V8 289 PROJECT CAR - NO RESERVE
| Price: | $ 510 |
|---|---|
| Make: | Ford |
| Model: | Mustang |
| Condition: | Used |
| Mileage: | 99999 |
| Engine: | 289 |
| Location: | 21640, Henderson, Maryland |
| #VIN: | 5F08F****** |
Seller's Notes:
WINNING BIDDER HAS NEVER CONTACTED ME - ITEM IS BEING RE-LISTED. PLEASE BE SERIOUS - THANK YOU. 1965 FORD MUSTANG CONVERTIBLE - THIS IS A PARTS OR PROECT CAR. I DO NOT HAVE A TITLE TO THIS CAR -- NO TITLE -- BILL OF SALE ONLY. APPEARS TO HAVE THE ORIGINAL 289 MOTOR. CAR HAS HAD FLOORS REPAIRED IN THE PAST. TRUNK HAS BEEN OVERLAYED WITH NEW METAL. CAR WILL NEED A COMPLETE RESTORATION, FRAME RAILS ARE VERY GOOD, REAR RAILS HAVE A FEW SMALL SPOTS BUT NOTHING SERIOUS, INNER SHOCK TOWERS LOOK REALLY ...
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