ivory nonperforming: October 2012

Wednesday, October 31, 2012

New self-assembling particles offer great promise for optical materials and ceramics

ScienceDaily (Oct. 31, 2012) ? Scientists have created new kinds of particles, 1/100th the diameter of a human hair, that spontaneously assemble themselves into structures resembling molecules made from atoms. These new particles come together, or "self-assemble," to form structures in patterns that were previously impossible to make and hold promise for manufacturing advanced optical materials and ceramics.

The method, described in the latest issue of the journal Nature, was developed by a team of chemists, chemical engineers, and physicists at New York University (NYU), the Harvard School of Engineering & Applied Sciences, the Harvard Department of Physics, and Dow Chemical Company.

The method is centered on enhancing the architecture of colloids -- small particles suspended within a fluid medium. Colloidal dispersions are composed of such everyday items as paint, milk, gelatin, glass, and porcelain, but their potential to create new materials remains largely untapped.

Previously, scientists had succeeded in building rudimentary structures from colloids. But the ability use colloids to design and assemble complex 3-dimensional structures, which are vital to the design of advanced optical materials, has been limited. This is, in part, because colloids lack directional bonds, which are necessary to control particle self-assembly as well as to enhance complexity while maintaining the structural integrity of these creations. Such assemblies serve as the building blocks of the natural world -- e.g., atoms and molecules -- but they are rare in the colloidal domain.

"What this method aimed to do was to use nature's properties for atoms and apply them to the colloidal world," explained NYU chemistry professor Marcus Weck, one of the study's coauthors.

"Chemists have a whole periodic table of atoms to choose from when they synthesize molecules and crystals," added coauthor Vinothan Manoharan, Associate Professor of Chemical Engineering and Physics at Harvard. "We wanted to develop a similar 'construction set' for making larger-scale molecules and crystals."

In developing colloids with such properties, the researchers engineered chemical "patches" that can form directional bonds, thus allowing for the assembly of 3-dimensional "lattices" with only a few connections between particles, an important design element for many advanced materials. Without directional bonding, such structures are unstable.

The trick was establishing bonding capabilities on the patches. The scientists did so by using single strands of DNA, which scientists at NYU and elsewhere have previously employed to organize small particles. In the method described in Nature, these strands of DNA served as "sticky ends" to which particle patches could adhere.

"What this means is we can make particles that attach only at the patches, and then we can program them so only specific kinds of particles attach at those patches," said coauthor and NYU physics professor David Pine. "This gives us tremendous flexibility to design 3-dimensional structures."

The researchers added that the specificity of DNA interactions between patches means that colloids with different properties, such as size, color, chemical functionality, or electrical conductivity, could lead to the production of new materials. These potentially include 3-dimensional electrically wired networks or photonic crystals to enhance the optical displays of a range of consumer products and to improve the speed of computer chips.

Additional coauthors included Yufeng Wang (NYU), Yu Wang (NYU), Dana R. Breed (Dow Chemical Co.), Lang Feng (NYU), and Andrew D. Hollingsworth (NYU).

Key work was performed at NYU's Materials Research Science and Engineering Center, an interdisciplinary laboratory supported by the National Science Foundation.

The research was also supported by grants from the National Science Foundation (MR-0820341, ChE-0911460, DMR-0923251).

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The above story is reprinted from materials provided by Harvard School of Engineering and Applied Sciences.

Note: Materials may be edited for content and length. For further information, please contact the source cited above.

Journal Reference:

Yufeng Wang et al. Colloids with valence and specific directional bonding. Nature, 2012 DOI: 10.1038/nature11564

Note: If no author is given, the source is cited instead.

Disclaimer: Views expressed in this article do not necessarily reflect those of ScienceDaily or its staff.

Source: http://feeds.sciencedaily.com/~r/sciencedaily/top_news/top_technology/~3/1z3x0hYpcX8/121031141752.htm

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Jurassic turtle graveyard found in China

Scientists say they've uncovered a pile of 1,800 Jurassic turtle skeletons in China that had been swept into a mass grave millions of years ago.

The fossilized mesa chelonia turtles were found in China?s northwest province of Xinjiang in what paleontologists call a "bone bed" with some of the shells stacked up on top of each other in the rock.

Some 160 million years ago, these turtles (identified as a species in the genus Annemys) likely had gathered in one of the remaining waterholes during a very dry period, awaiting rain, which apparently came too late, the researchers say. When all the water left in the hole dried up, the turtles died.

When the rain did finally arrive, it hit with catastrophic force. The inundation sent a river of mud over the area, washing the turtle corpses and surrounding sediments into one resting place, according to the paleontologists' analysis of the site. [ See Photos of the Turtle Fossils]

The shells are up to 8 inches (20 centimeters) long and in the zone with the highest fossil turtle concentration, the skeletons are packed at a density of up to 36 turtles per square meter (11 square feet), the researchers said.

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"This site has probably more than doubled the known number of individual turtles from the Jurassic," said Walter Joyce, a fossil turtle specialist at the University of T?bingen in Germany. The large sample gives researchers a rare chance to study variation among individuals in a single prehistoric species.

"We know from living organisms that individuals of some species look very similar, whereas individuals of other species show a lot of variation," Joyce wrote in an email to LiveScience. "As a paleontologist, it is therefore always difficult to assess if your fossil looks different from others because it is a new species, or because it is part of an already known, but variable species. With data from the new site we will finally be able to more rigorously assess patterns of diversity of turtles in the Jurassic of Asia."

The research appears in the October edition of the German journal Naturwissenschaften.

Follow LiveScience on Twitter @livescience. We're also on Facebook ? and Google+.

Source: http://www.msnbc.msn.com/id/49625129/ns/technology_and_science-science/

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Obama to resume campaigning on Thursday

WASHINGTON (AP) ? President Barack Obama plans to return to the campaign trail on Thursday with stops in Wisconsin, Nevada and Colorado, in his first campaign events since before a massive storm throttled the East Coast.

Obama campaign senior adviser David Axelrod said Wednesday the president intends to resume campaigning on Thursday. Campaign officials say the president will make stops in Green Bay, Wis., Las Vegas and Boulder, Colo.

The president's last campaign event was last Saturday in New Hampshire. He flew to Orlando on Sunday to attend a campaign rally on Monday with former President Bill Clinton but scrapped his campaign plans to return to Washington to monitor preparations for superstorm Sandy.

Axelrod was interviewed Wednesday on MSNBC's "Morning Joe."

Associated Press

Source: http://hosted2.ap.org/APDEFAULT/89ae8247abe8493fae24405546e9a1aa/Article_2012-10-31-US-Obama/id-55707e5c1fdc4e26952b780a980aed16

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UK police may sell New Scotland Yard headquarters

LONDON (Reuters) - London's cash-strapped police force may sell its New Scotland Yard headquarters as part of plans to save 500 million pounds.

The 1960s-era complex in the Victoria district could fetch between 150-200 million pounds, property agents said. The Metropolitan Police bought the block from Land Securities in 2008 for 122 million pounds.

The possible sale is part of a wider cost-cutting drive to shrink the force's 900,000 square metres estate by one third by 2016, the Met said in an e-mailed statement.

"We won't keep older buildings any longer than we need to...Our plans relate to all areas of the estate, including all HQ buildings and potentially moving New Scotland Yard from its current location," a spokeswoman said, adding that no final decision had been made.

The 20-storey block, surrounded by concrete blast barriers and famous for its revolving sign, will need 50 million pounds of maintenance over the next few years, the police said.

Should the sale go ahead, it may move its headquarters to a smaller building in the Westminster district.

The Victoria neighbourhood has been targeted by redevelopers including Land Securities, which is building prime offices, shops and over 200 homes in the district.

Last week, the government sold Admiralty Arch, a gateway between The Mall and Trafalgar Square in London, for 60 million pounds to Spanish investor Rafael Serrano as part of a cost-cutting drive.

(Reporting by Brenda Goh; Editing by David Cowell)

Source: http://news.yahoo.com/uk-police-may-sell-scotland-yard-hq-over-141114898--sector.html

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Monday, October 29, 2012

News Summary: NYSE to trade electronically Monday

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Source: http://news.yahoo.com/news-summary-nyse-trade-electronically-220413108.htmlPussy Riot National Hurricane Center Zeek Rewards elvis presley elvis presley vanessa bryant vanessa bryant

Friday, October 26, 2012

Anno 1450 - Literate Alternate History Roleplay

"It is the year of our lord, 1450 Anno Domini.
Europe is in high flames, as heretics and heathens from the steppes have forced their way into the very heart of the Catholic world, defeating any army in their path.
An unending wave of heathen Muslims seem to have gathered in the Balkans. And Granada, a contested region, has been occupied by the vile Muslims.
Poland-Lithuania have also been overcome, heretics have converted them to the orthodox belief, a demonic and vile branch of the true faith.
Truly, our lord is testing our faith."
"As a reaction to the unstablility in Europe, Pope Nicolaus Quintus has gathered his most trusted paladins and templars, men of faith, to combat the vile threats against Christianity. These men and women have been sent to the papal garrison in St. Mary's cathedral in Pamplona in Navarra.
From there, they are to fight the heathen and smite the heretic in whatever form they may come.
May God have mercy upon our mortal souls, and may the way to Heaven be open for his servants.
Deus Vult."

As you can see, I've outlined the idea of the roleplay above. If you're interested, then let me know and we might be able to discuss plot and world.
As to my own ideas for this so far, then I plan on having a magic system and several chapters and stories I'd like to roleplay, so the finished product will be rather elaborate.

My requirements for you: Literacy, compatibility, humour and ingenuity.

I'd like you to make a character that is different and intriguing.

In return I'll be committed to the game, open to ideas and hardworking for the plot to move past the initial stage.

- Minion

Source: http://feedproxy.google.com/~r/RolePlayGateway/~3/cDY49WOT9ig/viewtopic.php

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Thursday, October 25, 2012

Steve Carell to executive-produce Fox comedy starring "Daily Show" correspondent Jason Jones

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