Friday, December 28, 2007

Sossina Haile: The Power Behind Cooler, Greener Energy


Supra-heroine: Haile makes a green technology greener

Newsweek -- Sossina Haile created a new type of fuel cell by default. In the late '90s, the Caltech scientist had an idea that she thought might dramatically improve fuel cells, the clean technology that converts chemical energy to electricity to power cars, buses and power plants. Haile's idea was to employ an entirely new type of "superprotonic" compound that might help supply power at dramatically lower cost. But when fuel-cell makers balked at revamping their entire systems to try her solution, Haile decided to fabricate the world's first solid-acid fuel cell in her lab. Early in 2008 a Pasadena, Calif., start-up called Superprotonic—founded by two of her former grad students—will ship the first commercial prototypes to energy-systems makers. The output is barely enough to power a 100-watt bulb, but hopes are high that the small start will someday produce powerful fuel cells for commercial use. "This is potentially a breakthrough technology," says former senator Bill Bradley, who sits on the Superprotonic board.

She's hardly alone in seeing the promise of fuel cells, which produce energy through chemical reactions; their chief emission is pure water. (To prove that point, Haile once drank the tailpipe emission of a fuel-cell car on camera.) Not only do we need to find carbon-neutral fuel sources to slow global warming, but the world's energy needs will continue to grow—by an estimated 50 percent by 2050. Today, small fuel cells power a few cars and buses (Honda will begin leasing a fuel-cell FCX Clarity next summer), while large ones produce electricity at some factories and universities. They are expensive, but Haile's fuel cells may be cheaper and more durable.

Haile, a mother of two, has never followed a conventional path. Her family fled Ethiopia during the coup in the mid-'70s, after soldiers arrested and nearly killed her historian father, then settled in rural Minnesota before Haile, now 41, went to MIT and grad school. Superprotonic launched in 2003, with Haile as science adviser.

Haile's discovery may someday fill a need for a fuel cell that generates power at midrange temperatures. Low-temperature cells (20 degrees to 100 degrees Celsius) require costly platinum catalysts to speed the reactions; superhot "solid oxide" fuel cells react easily, but require expensive ceramic materials that can withstand operating temperatures of 600 degrees to 1,000 degrees Celsius. Finding a material that operates well in a midrange "is quite important," says Jack Brouwer, associate director of the National Fuel Cell Research Center at the University of California, Irvine, though he adds that it's too early to say if Haile's cell will be commercially viable.

Haile is confident it will, but she's also busy "tweaking" high-temperature systems to increase power output and lower costs. For her, the race to find new energy sources is fascinating. She says, "There's nothing better than being able to combine an intellectually exciting topic with the knowledge that it will be beneficial. To me, that's just glory."

Monday, December 10, 2007

In Nubia, Fears of Another Darfur

LA Times -- The tranquil Nubian villages along this Nile River stretch are best known for the brightly painted gates that adorn many of the simple mud-brick homes. With geometric shapes and hieroglyphic-like pictures, the oversized gates hark back to the stone-carved doorways the villagers' ancestors once built on pyramids that rivaled Egypt's.

These days, however, the elaborate entryways are shadowed by black flags. Government soldiers patrol once-quiet dirt streets, occasionally drawing stones from angry youths. Protest graffiti mar the walls, including one scrawling of an AK-47 with the simple caption: "Darfur 2."

First, southern Sudan erupted in a 20-year civil war, followed by the east and, most recently, the western region of Darfur. Now many fear that Sudan's northern territory of Nubia will be the next to explode over the fight for resources and all-too-familiar accusations of "ethnic cleansing" and complaints of marginalization by an Arab-dominated government.

Tensions have been high here since soldiers opened fire on an anti-government protest of 5,000 Nubians in June, killing four young men and wounding nearly two dozen. The government has arrested nearly three dozen Nubian leaders and four journalists who were trying to cover the violence.

Now a recently formed rebel group, calling itself the Kush Liberation Front, is advocating armed resistance to overthrow the central government, which it accuses of oppressing Nubians and other indigenous peoples in Sudan.

"Our efforts will not succeed unless they are backed by military action," said Abdelwahab Adem, a Nubian former businessman and co-founder of the Kush Liberation Front. "We need to get rid of the Arabs. Our goal is to realize a new Sudan, by force if necessary."

Adem said the new movement would rely on "guerrilla fighting," targeting the capital, Khartoum, and other major Sudanese cities. He declined to specify what sort of tactics might be used or how many fighters the group has.

With a separate language and culture, Nubians view themselves as a distinct ethnic group and take pride in being one of Africa's oldest civilizations. Political observers say the budding movement appears to be taking its cue from the rebellions in Darfur and southern Sudan.

"That's the lesson of Darfur," said one Western diplomat in Khartoum, who spoke on condition of anonymity.

"The government will only listen to you when you pick up a gun."

Darfur rebels are a potential source of weapons and training for the Kush Liberation Front, observers said.

"We have good relations with our brothers in Darfur," said Adem, who is based in London. But he denied receiving support from the western Sudanese rebels.

The spark for recent unrest was a government proposal to construct two or three electricity-producing dams along the Nile in the Nubian heartland, between the villages of Kajbar, about 350 miles north of Khartoum, and Dal, about 100 miles from the Egyptian border.

This fertile Nile River strip is home to an estimated 300,000 Nubians, many of whom would be forced to relocate if rising river waters swallowed scores of villages.

Also at risk are some of the world's richest archeological ruins, notably those around the ancient city of Kerma, the first Nubian capital, settled at least 8,000 years ago and lying just downstream from where the proposed 200-megawatt Kajbar dam would be built. The site is home to the oldest known man-made structure in sub-Saharan Africa: a 50-foot, 3,500-year-old mud-brick temple known as the Deffufa.

The proposals come on top of another controversial project, the 1,250-megawatt Merowe Dam, which is already under construction about 150 miles to the east. Flooding from that project will displace 70,000 Arab farmers and engulf several hundred miles of unexplored Nubian archeological sites.

"They want to cut us from our roots and flood all of Nubia and its history," said Sharif Adeen Ali, 53, a Nubian farmer in the village of Sebu. "They've done this before."

In 1964, construction of the Aswan High Dam in Egypt forced the relocation of 50,000 Sudanese Nubians in the Wadi Halfa region near the Egyptian border and nearly 800,000 Nubians in Egypt.

Nubians see the new dams as a plot by Arab governments in Sudan and Egypt to exterminate their communities and seize the land.

"The two countries have never liked having Nubians, who are not Arabs, in the middle," said Abdul Halim Sabbar, a former doctor who is part of the Kajbar Dam Resistance Committee.

In Sebu, one of the Nubian communities that would be submerged by the Kajbar dam, once-welcoming residents now peer warily at the parade of unfamiliar trucks and SUVs that speeds through town carrying Chinese engineers to a work site a mile away. Though government officials say they are only conducting a feasibility study, Chinese crews are installing giant cranes, water towers, floodlights and other equipment that suggest to villagers that construction is underway.

On a recent morning, nearly 400 government soldiers marched and drilled at a new military camp set up on the edge of Sebu to protect the Chinese workers. On hills overlooking the village, uniformed lookouts with rifles over their shoulders positioned themselves behind rocks.

"It's become very tense," said one villager, who was afraid to be identified. "Many eyes are watching."

Officials at Sudan's Dams Implementation Unit declined to comment.

A leader in Sudan's ruling party defended the dams, contending that they would help the Nubian communities by providing electricity and irrigation for farming.

"It's going to economically transform the area," said Osman Khalid Mudawi, foreign affairs chairman in Sudan's parliament. He estimated that a lake created by the dam would irrigate 750,000 acres of newly arable land.

But some scientists and environmentalists questioned whether the dams would expand food production, noting that the region's soil is mostly desert sand and granite. Farming is possible only along the riverbanks, thanks to rich silt deposits from the Nile.

A recent report by the United Nations Environmental Program noted that Sudan's existing dams suffer from declining performance because they are clogged with silt, which has proved difficult to remove. Water loss as a result of the high evaporation rates in the desert heat is another problem. Meanwhile, downstream from the dams, farm production has fallen because the soil is no longer enriched by the silt.

It's a similar story at the Aswan High Dam, where the lake created by the dam is filling with silt much faster than anticipated and downstream farmers are resorting to artificial fertilizers for the first time.

Nubians argue that the new dams are not intended to provide electricity and irrigation in Sudan, but to rescue the Aswan High Dam by capturing silt before it reaches Egypt. "These dams don't look at all like development," said Sabbar, the resistance committee member. "It's clearly part of a programmed scheme between Egypt and Sudan."

For decades, Nubians have lived in relative isolation, shunning politics and priding themselves on self-sufficiency. Some years the region found itself entirely left out of the federal budget, which is evident from the lack of paved roads and electricity. Nubians built their own hospitals and schools, though they are still prohibited by law from teaching in their native language.

The threat of renewed flooding, however, has drawn Nubians out of the political desert, and they are mobilizing for a fight.

In addition to demonstrations in Sudan, Nubians abroad are pressing the issue with the United Nations, U.S. State Department and human rights groups such as Amnesty International and Human Rights Watch. They've protested at the Sudanese and Chinese embassies in Washington and uploaded graphic footage of the June 13 clashes on the Internet.

"We have more freedom to express ourselves than those still inside Sudan," said Nuraddin Abdulmannan, a Nubian activist who is heading the resistance committee in Washington. He says it is the duty of the international community to preserve the region's archeological sites, which include temples and pyramids built when Nubian kings briefly reigned over Egypt's pharaohs around 730 BC.

"This is an international treasure, and there's an international responsibility to protect it."

For many, the June clash with government troops was the final indignity. Witnesses said soldiers tear-gassed the noisy but peaceful demonstrators, forcing many to jump into the river to escape the fumes. When protesters began to regroup, soldiers opened fire without warning.

"It was a murder, an assassination," said Ahmed Abdullahi Ameen, 63, whose son, 28, was one of the four killed. The young man, Sheik Adeen Haj Ahmed, was shot in the back of the head as he climbed out of the river.

Many Nubians say they have little to lose. Izzadin Idriss Mohammed, 71, a Nubian activist in the village of Farig, described the tensions with an old Nubian saying:

"One who is sinking in the Nile will reach for any branch to survive."

***
Sign the Petition to Rescue Nubia!

Kerma központja vályogtégla és tapasztott agyag épületek maradványival

Kerma városának központi temploma, az úgynevezett nyugati deffufa



Photo Courtesy: http://hu.wikipedia.org/wiki/Kerma

Thursday, December 06, 2007

Tiny Statue of Lioness Sells for Record $57.2 Million

Bloomberg -- An ancient limestone statue of a regal lioness just 3 inches tall sold today for $57.2 million including commissions at Sotheby's in New York, doubling the previous auction record for sculpture.

The price more than tripled the sculpture's presale high estimate of $18 million. The previous record was $28.6 million, set in June for a Roman bronze of Artemis, goddess of the hunt.

The buyer, dressed in a gray suit, attended the sale and was identified by Sotheby's as English. He declined to comment. The sale price didn't surprise at least one observer.

``It's completely understandable,'' said Robert Simon, a New York art dealer who specializes in Old Master paintings. ``It's a phenomenal piece. It has tremendous power.''

Known as the Guennol Lioness, the 5,000-year-old Elam statue is said to have been made in what is now Iran and found near Baghdad, Sotheby's said. It's been on view at the Brooklyn Museum since 1948, on loan from Alastair Bradley Martin, the grandson of steel magnate Henry Phipps.

Martin and his late wife assembled an art collection ranging from Mexican folk sculpture to a Willem de Kooning painting to Japanese porcelains. They named their Long Island home and collection ``Guennol,'' the Welsh word for Martin, a romantic nod to their honeymoon in Wales.

The Guennol Collection was exhibited at the Metropolitan Museum of Art in 1969 and the Brooklyn Museum in 2000. Martin has served as a trustee and president of the board of the Brooklyn Museum. The sale benefits a charitable trust established by the Martin family.

The final price includes a buyer's premium, or commission, of 25 percent of the hammer price up to $20,000, 20 percent of the price from $20,000 to $500,000, and 12 percent above $500,000.

Related Links

http://en.wikipedia.org/wiki/Elam


http://en.wikipedia.org/wiki/Behistun_Inscription

http://www.ancientscripts.com/elamite.html

http://en.wikipedia.org/wiki/Kish_%28Sumer%29

http://www.artquid.com/files/image/Guennol%20Lioness%20full%20view.jpg