Friday, March 8, 2013

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Heating with powder and plastic wastes

Mar. 7, 2013 ? Disposing of waste -- whether it is coating powder or swarf -- is expensive. In the future, a combustor for powdery residues will enable companies to cut disposal costs and heating costs at the same time.

A great deal of powder is needed to coat auto parts and other objects -- and a great deal of waste is left over afterward: After all, only a fraction of the coating ends up on an autobody; the rest misses the target and is suctioned away. Recycling of residual powder has limits: If coaters mix in too much "recycled" powder, the quality of a coating suffers. Companies therefore dispose of most of the coating powder -- an expensive undertaking. Grinding processes are similar: They also produce many residues and companies have to dig deep in their pockets to dispose of them.

In the future, industrial plants will be able to cut such disposal costs as well as heating costs for facilities, kilns and many other high-temperature processes. This is being made possible by a plant, which researchers at the Fraunhofer Institute for Factory Operation and Automation IFF in Magdeburg developed in cooperation with an industry partner. "The plant we developed enables us to recover heat from any combustible, powdery industry waste, whether it is coating powders, polymer powders or even wood constituents," says Marcus K?gler, in charge of the project at the Fraunhofer IFF. "The potential savings are large: 25 percent of the natural gas usually used for heating and, additionally, 100 percent of the disposal costs are being saved at a reference facility. A plant with a larger capacity can even produce electricity that can be supplied to the electrical grid.

An Ideal Burner for Small Quantities of Waste

The plant consists of three basic units: a pulverized fuel burner, a boiler and a filter system. Powdery waste is conveyed into the burner pneumatically, i.e. with compressed air, where it is agitated systematically, brought into contact with air and burned. Water stores the heat produced and thus heats facilities or kilns. The flue gases produced during combustion are suctioned off and purified in the filter system. The pulverized fuel burner is approximately 50 times smaller than conventional models and thus has only approximately two percent of their capacity. The advantage: This also makes the burner worthwhile for smaller quantities of waste, like those produced in small and medium-sized enterprises. "In order to be able to compute the temperature distributions and flow paths in this small burner, we first ran CFD (computational fluid dynamics) simulations," says K?gler. These simulations answered numerous questions for the researchers, thus helping them develop the burner: How do the powder particles flow in the burner? How can they be agitated optimally? How can the lowest emission levels be achieved? In another step, the researchers further optimized the burner's settings and parameters in experiments.

A pilot plant is already operating at MBG Metallbeschichtung Gerstungen GmbH. It cuts the natural gas used by one quarter. The company holds a patent on the process for the recovery of heat from powder residues from coating plants, which was granted in conjunction with this project. The researchers from the Fraunhofer IFF customized the pilot plant specifically for the company's requirements. The researchers have to modify each new plant for the requirements, depending on what powder is produced in a plant. In other words, they have to engineer the pulverized fuel burner's combustion system for the size of the particular particles and design the filter system so that it optimally filters each of the flue gases produced out of the air. Learn more about the recovery of heat from residues, entrained flow combustion and the pilot plant from the Fraunhofer IFF's experts at the Hannover Messe.

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Source: http://feeds.sciencedaily.com/~r/sciencedaily/matter_energy/electricity/~3/wWkcJVYQp3A/130307145143.htm

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Thursday, March 7, 2013

Venezuela's Chavez dies, officials call for unity

Supporters of Venezuela's President Hugo Chavez react as they learn that Chavez has died through an announcement by the vice president in Caracas, Venezuela, Tuesday, March 5, 2013. Venezuela's Vice President Nicolas Maduro announced that Chavez died on Tuesday at age 58 after a nearly two-year bout with cancer. During more than 14 years in office, Chavez routinely challenged the status quo at home and internationally. He polarized Venezuelans with his confrontational and domineering style, yet was also a masterful communicator and strategist who tapped into Venezuelan nationalism to win broad support, particularly among the poor. (AP Photo/Ariana Cubillos)

Supporters of Venezuela's President Hugo Chavez react as they learn that Chavez has died through an announcement by the vice president in Caracas, Venezuela, Tuesday, March 5, 2013. Venezuela's Vice President Nicolas Maduro announced that Chavez died on Tuesday at age 58 after a nearly two-year bout with cancer. During more than 14 years in office, Chavez routinely challenged the status quo at home and internationally. He polarized Venezuelans with his confrontational and domineering style, yet was also a masterful communicator and strategist who tapped into Venezuelan nationalism to win broad support, particularly among the poor. (AP Photo/Ariana Cubillos)

A supporter of Venezuela's President Hugo Chavez cries as she learns that Chavez has died through an announcement by the vice president in Caracas, Venezuela, Tuesday, March 5, 2013. Venezuela's Vice President Nicolas Maduro announced that Chavez died on Tuesday at age 58 after a nearly two-year bout with cancer. During more than 14 years in office, Chavez routinely challenged the status quo at home and internationally. He polarized Venezuelans with his confrontational and domineering style, yet was also a masterful communicator and strategist who tapped into Venezuelan nationalism to win broad support, particularly among the poor. (AP Photo/Ariana Cubillos)

Supporters of Venezuela's President Hugo Chavez react after the vice president announced Chavez's death in downtown Caracas, Venezuela, Tuesday, March 5, 2013. Venezuela's Vice President Nicolas Maduro announced that Chavez died on Tuesday at age 58 after a nearly two-year bout with cancer. During more than 14 years in office, Chavez routinely challenged the status quo at home and internationally. He polarized Venezuelans with his confrontational and domineering style, yet was also a masterful communicator and strategist who tapped into Venezuelan nationalism to win broad support, particularly among the poor. (AP Photo/Fernando Llano)

In this photo released by Miraflores Presidential Press Office, a priest prays next to Venezuela's Vice President Nicolas Maduro, left, and military officers after Maduro addressed the nation to announce the death of President Hugo Chavez in Caracas, Venezuela, Tuesday, March 5, 2013. Maduro announced that Chavez has died on Tuesday at age 58 after a nearly two-year bout with cancer. (AP Photo/Miraflores Presidential Press Office)

Supporters of Venezuela's President Hugo Chavez react to the news that that Chavez has died, as they gather outside the military hospital where Chavez was being treated in Caracas, Venezuela, Tuesday, March 5, 2013. Venezuela's Vice President Nicolas Maduro announced that Chavez died on Tuesday at age 58 after a nearly two-year bout with cancer. During more than 14 years in office, Chavez routinely challenged the status quo at home and internationally. He polarized Venezuelans with his confrontational and domineering style, yet was also a masterful communicator and strategist who tapped into Venezuelan nationalism to win broad support, particularly among the poor. (AP Photo/Fernando Llano)

(AP) ? Some in anguish, some in fear, Venezuelans raced for home on Tuesday after the government announced the death of President Hugo Chavez, the firebrand socialist who led the nation for 14 years.

Vice President Nicolas Maduro's voice broke and tears ran down his face as he appeared on national television to announce that Chavez died at 4:25 p.m. local time (3:55 p.m EST; 1755 GMT) "after battling hard against an illness over nearly two years."

He did not say what exactly killed Chavez, although the government had announced the previous night that a severe new respiratory infection had severely weakened him.

Just a few hours earlier, Maduro made a virulent speech against enemies he claimed were trying to undermine Venezuelan democracy.

But as he announced the death, Maduro called on Venezuelans to be "dignified inheritors of the giant man" Chavez was.

"Let there be no weakness, no violence. Let there be no hate. In our hearts there should only be one sentiment: Love. Love, peace and discipline."

All across downtown Caracas, shops and restaurants begin closing and Venezuelans hustled for home, some even breaking into a run.

Many had looks of anguish and incredulity on their faces.

"I feel a sorrow so big I can't speak," said Yamilina Barrios, a 39-year-old clerk who works in the Industry Ministry, her face covered in tears.

"He was the best this country had," she said, disconsolately weeping. "I adore him.

"I hope the country calms down and continues the work that he left us, continues in unity and the progress continues," Barrios said.

Among the nervous was Maria Elena Lovera, a 45-year-old housewife.

"I want to go home. People are crazy and are way too upset."

In the only immediately known incident of political violence, a group of masked, helmeted men on motorcycles, some brandishing revolvers, attacked about 40 students who had been protesting for more than a week near the Supreme Court building to demand the government give more information about Chavez's health.

The attackers, who wore no clothing identifying any political allegiance, burned the students' tents and scattered their food just minutes after the death was announced.

"They burned everything we had," said student leader Gaby Arellano. She said none of the attackers fired a shot but that she saw four with pistols.

Maduro called on Venezuelans to convene in the capital's Bolivar Square, named for the 19th century independence hero Simon Bolivar, who Chavez claimed as his chief inspiration.

The vice president also called on the opposition to respect "the people's pain."

"Those who never supported the comandante Hugo Chavez, respect the pain of the people. This is the moment to think of our families, of our country."

Chavez leaves behind a socialist political movement firmly in control of the nation, but with some doubt about how a new leadership will be formed.

Chavez's illness prevented him from taking the oath of office after he was re-elected to a new term on Oct. 7 and under the constitution, National Assembly chief Diosdado Cabello apparently would take over as interim president.

But there was no sign of Cabello on the podium as Maduro announced Chavez's death.

The constitution also says that elections should be called in 30 days. Chavez had specified that his supporters should support Maduro as his successor.

The man Chavez defeated in October, the youthful Miranda state Gov. Henrique Capriles, would be expected to represent the opposition.

Venezuela's defense minister also appeared on television to announce that the military will remain loyal to the constitution in the wake of Chavez's death.

Admiral Diego Molero appealed for "unity, tranquility and understanding" among Venezuelans.

The announcement stunned Venezuelans, if it did not surprise them.

Earlier in the day, Maduro used a more belligerent tone as he announced the government had expelled two U.S. diplomats from the country and said "we have no doubt" that Chavez's cancer, which was first diagnosed in June 2011, was induced by "the historical enemies of our homeland."

He compared the situation to the death of the Palestinian leader Yasser Arafat, claiming Arafat was "inoculated with an illness."

Chavez's inner circle has long claimed the United States was behind a failed 2002 attempt to overthrow him, and he has frequently played the anti-American card to stir up support. Venezuela has been without a U.S. ambassador since July 2010.

Maduro has been taking on a larger role since Chavez urged Venezuelans to choose him as president before disappearing in early December to undergo a fourth round of cancer surgery in Cuba.

He accused U.S. Embassy's Air Force attache Col. David Delmonaco of spying on Venezuela's military and seeking to involve officers in "destabilizing projects." Maduro gave Delmonaco 24 hours to leave, and U.S. officials said he had already departed the country.

Maduro said Tuesday that the government was "on the trail of other elements that figure in this entire venomous scenario and are seeking to stir up trouble."

Later Tuesday, Foreign Minister Elias Jaua said a second U.S. Air Force attache was being expelled, also for alleged espionage.

"Let's remember that active participation of the United States in the fascist coup of 2002," Jaua said.

Chavez has run Venezuela for more than 14 years as a virtual one-man show, gradually placing all state institutions under his personal control. But the former army paratroop commander, who rose to fame by launching a failed 1992 coup, never groomed a successor with his same kind of force of personality.

The campaign for the upcoming election to replace him, though undeclared, has nevertheless already begun.

Maduro has frequently commandeered all broadcast channels, Chavez-style, to tout the "revolution" and vilify the opposition.

Maduro on Tuesday repeated government claims that Capriles met in the United States over the weekend with right-wing U.S. conspirators and was planning to meet over the weekend with Roberta Jacobsen, assistant U.S. secretary of state for the hemisphere.

One personality on state TV also accused the Capriles family of buying a New York City apartment with stolen funds.

Capriles responded via Twitter Tuesday by calling Maduro a liar.

"Lie after lie in every speech," he said.

Chavez, long famed for his marathon appearances at televised events, had neither been seen nor heard from, except for photos released in mid-February, since submitting to a fourth round of surgery in Cuba on Dec. 11 for an unspecified cancer in the pelvic area. It was first diagnosed in June 2011.

The government said Chavez returned home on Feb. 18 and has been confined to Caracas' military hospital ever since.

Maduro said last week that the president had begun receiving chemotherapy around the end of January.

Among those stunned by the announcement was 38-year-old soft drink seller Nelson Ramirez, who sympathized with the fallen president.

"This is the worst thing that could have happened to our country," he said. "Without Chavez, I don't know what will happen here. We poor people could be forgotten again."

On the other side of Venezuela's political divide was Carlos Quijada, a 38-year-old economist who said he was sad that death rather than an election defeat had written Chavez's political obituary.

"Now there is a lot of uncertainty about what is going to happen," he said.

___

Associated Press writers Christopher Toothaker in Caracas, Vivian Sequera in Bogota, Colombia, and Robert Burns in Washington contributed to this report.

Associated Press

Source: http://hosted2.ap.org/APDEFAULT/cae69a7523db45408eeb2b3a98c0c9c5/Article_2013-03-05-Venezuela-Chavez/id-0070d3dfe69c4fb696bcb0ff556cd758

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Graphene antenna could increase wireless speed 100 times

Frustrated by slow Wi-Fi speeds? Researchers at Georgia Tech are working on antennas that could transfer your files so fast that you might miss it if you blink. Their solution uses graphene, a miracle material that is starting to affect many industries.

Graphene is a material made up of just a single-atom layer of carbon, giving it many interesting properties. One such property is that it conducts electricity extremely well, meaning it can replace silicon or metals in electronics, conferring huge improvements to speed and efficiency.

In this case, the team at Georgia Tech, led by Ian Akyildiz, is proposing an antenna made of the stuff. A graphene antenna could work at terahertz frequencies, far beyond the megahertz and gigahertz rates found in even the most advanced wireless devices today.

The end result could, under the right circumstances, provide data rates of up to 100 terabits per second, Akyildiz told MIT's Tech Review. That's enough to transfer the contents of any ordinary hard drive in just a fraction of a second ? the blink of an eye.

More conservative estimates, which take into account greater distances between the antennas and other factors, still suggest terabit speeds would be achieved, requiring just a few seconds to transfer the contents of a 1 TB hard drive.

It's still very much just a theory, though; No one has built such an antenna and there are serious obstacles yet to tackle. Graphene is difficult to make in the first place, and many systems will have to be completely redesigned around it. But so many interesting applications for the material have been lofted that scientific minds all over the world are racing to find solutions.

Devin Coldewey is a contributing writer for NBC News Digital. His personal website is coldewey.cc.

Source: http://www.nbcnews.com/technology/futureoftech/graphene-antenna-could-increase-wireless-speed-100-times-1C8709122

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Monday, March 4, 2013

Pocket dialing calls police to Oregon drug deal

(AP) ? Police in the Oregon town of Molalla say a dispatcher received a cellphone call and overheard a drug deal taking place.

A phone in the woman's pocket inadvertently dialed 911 early Tuesday and dispatchers heard a conversation with a man about drugs.

KGW reports (http://bit.ly/13tEKpX ) police tracked the GPS signal to a car in an alley about a block away. An officer who arrived at the scene could be heard over the phone by dispatchers.

The officer found methamphetamine and arrested a 25-year-old man on multiple drug charges. The 25-year-old woman was cited for possessing marijuana ? and hung up her phone.

___

Information from: KGW-TV, http://www.kgw.com/

Source: http://hosted2.ap.org/apdefault/aa9398e6757a46fa93ed5dea7bd3729e/Article_2013-03-01-Pocket%20Dialing%20Police/id-9e3de95bab344b9daa862a72691c688e

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Police: Man douses girlfriend in perfume, sets her afire

By Becky Bratu, Staff Writer, NBC News

A Pennsylvania man accused of pouring perfume on his girlfriend and setting her on fire in an apparent domestic dispute was arrested Saturday, Pittsburgh's WTAE reported.?

Springdale police said 22-year-old Maria Redman was burned on more than 30 percent of her body early Thursday morning when 27-year-old Clinton Cohen threw perfume on her and then lit her on fire with a cigarette lighter, according to WPXI. Cohen then threw a blanket at Redman and walked out of the apartment.

According to police, the couple's infant daughter was at home in a crib when the incident occurred.

?It was a verbal domestic dispute and he began choking her, then punched her,? Lt. Jeff Korczyk told WPXI. ?Cohen then opened a bottle of perfume, poured it over the victim and lit it with a cigarette lighter.?

Korczyk said the daughter had some blood spatter on her from her mother.

Officials said Redman remains in the hospital in critical, but stable condition.

Cohen has been charged with attempted homicide, aggravated assault and endangering the welfare of children.

Source: http://usnews.nbcnews.com/_news/2013/03/02/17163545-man-douses-girlfriend-in-perfume-sets-her-on-fire-police-say?lite

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Firearms Miscellany (Powerlineblog)

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