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Friday, September 14, 2007

A preliminary report by the Danish civil aviation authority, SLV, has shed light on the events leading up to a Scandinavian Airlines System (SAS) airliner experiencing a landing gear failure upon landing in Denmark, one of two similar crashes that have resulted in the grounding of more than 60 of the model in question across the world.

The aircraft, a Bombardier Q400 (alternatively known as a de Havilland Canada Dash 8), crashed due to a landing gear failure after a nut worked loose, due in turn to rusting on the threads of its bolt, according to the SLV’s aircraft accident investigation committee report on Scandinavian Airlines Flight 1209. The nut and bolt were vital to the locking mechanism for the starboard landing gear, and consequently the structure collapsed.

The SLV does not specifically address why this occurred, but according to SLV spokesman Thorbjoern Ancker the problem is a design flaw, and not a maintenance issue as previously suspected. In his own words, ‘All speculation that this was an error by SAS is now shown to be wrong… It’s a constructional weakness.’ He explained that Bombardier maintenance documents supplied with the aircraft did not require maintenance personnel to inspect the bolt in question, and that accordingly this had not been done.

Pending completion of landing gear inspections by SAS, Norwegian, Swedish and Danish authorities will make a decision regarding whether the air carrier’s Q400 fleet should remain grounded, or be permitted to resume operations.

A spokesman for Bombardier refused to comment on the findings when contacted by reporters, preferring instead to wait until the publication of the final report into the accident. He did, however, make one comment regarding speculation that SAS would be compensated if the accident was proven to be the responsibility of the supplier, saying, “That will be part of the discussions between Bombardier and airlines.”

Scandinavian Airlines have canceled 111 flights today as their Q400s are grounded per Air Transport Canada orders, while SAS have concealed 110 flights today and tomorrow while their aircraft are grounded.

Bombardier have circulated a document to all operators of the type, containing advice recommending a revised inspection program.

Shares in Bombardier fell 14 cents, or 2.2%, to CA$6.21 and most recent reports have them at $6.25. The company is therefore currently valued at $11 billion. Goodrich, who manufactured the equipment, fell 9 cents, or 0.1%, to US$65.11. SAS, who own Scandinavian Airlines, fell 2.25 kronor, or 1.9%, to 115.75 kronor. A continuing fall in SAS shares prices over the last six weeks has almost negated all gains this year.

Monday, May 30, 2011

The University of Chicago’s Joe and Rika Mansueto Library was shut down by a power outage for a short time on Saturday, preventing library personnel from providing full services to its patrons.

The US$81 million library, which opened May 16, includes a 180-seat reading room under a 691-panel glass dome. Five stories underground, a system of five cranes retrieves books sorted into bins, carrying a maximum of about 3.5 million volumes. As of 3:50 p.m. CDT, the automated storage and retrieval system, along with staff computers at the circulation desk, were shut down, preventing patrons from retrieving materials stored underground.

The glass ceiling normally allows enough natural light to pass, but rain clouds in the area darkened the room. Patrons began to flip light switches in front of their seats, but to no avail, and a circulation clerk announced that there had been a power outage. Some patrons then moved to the adjacent Regenstein Library, which still had power. Power was still running along the corridor linking Mansueto and Regenstein Libraries, along with the nearby restrooms and Special Collections Research Center.

An electrician arrived at the building at around 3:50 p.m., and power had been restored by 5:45 p.m.

Thursday, February 24, 2005

A paste containing synthetic tooth enamel can seal small cavities without drilling. Kazue Yamagishi and colleagues at the FAP Dental Institute in Tokyo say that the paste can repair small cavities in 15 minutes.

Currently, fillers don’t stick to such small cavities so dentists must drill bigger holes. Hydroxyapatite crystals, of which natural enamel is made, bond with teeth to repair tiny areas of damage.

Yamagishi and colleagues have tested their paste on a lower premolar tooth that showed early signs of decay. They found that the synthetic enamel merged with the natural enamel. The synthetic enamel also appears to make teeth stronger which will improve resistance to future decay. As with drilling, however, there is still the potential for pain: The paste is strongly acidic to encourage crystal growth and causes inflammation if it touches the gums.

The paste is reported in the journal Nature.

Monday, July 4, 2011

Officials announced that a treasure containing sacks of diamonds and gold coins as well as golden idols, jewelry and other riches has been discovered in the secret subterranean vaults of Sree Padmanabhaswamy temple, in the southwestern state of Kerala, India. Estimates of its worth have been rising and it is now thought to be worth US$20 billion.

The Hindu temple was built in the 16th century by the kings of the then Kingdom of Travancore to serve as a royal chapel for the rulers of Travancore. The six vaults containing the treasure have been undisturbed for over a century. Assessment of the treasure began on June 27 after a lawyer concerned about the security of the treasure petitioned India’s Supreme Court, which then appointed a seven-member panel of experts to inventory the treasure. The panel does not have the power to determine to whom the treasure will belong. Estimates of the treasure’s worth are rising, provoking a heated debate as to how the treasure will be used in a country that has 450 million poverty-stricken people.

The chief minister of Kerala, Oommen Chandy, announced on Sunday the treasure would remain with the temple, and security matters would be decided in consultation with the Travancore Royal Family, the temple management, and the temple priest.

“The gold was offered to the lord. It is the property of the temple. The government will protect the wealth at the temple,” Oommen Chandy said. Meanwhile, hundreds of armed police have been deployed around the temple to protect the treasure.

However, the view that the treasure should remain at the temple has been disputed. Among the dissenters is eminent jurist V R Krishna Iyer, who said the treasure should be put in a national trust for the peoples’ benefit. “God’s wealth belongs to the people, not to the king. It’s meaningless to say that it belongs to Hindus or any particular religious community,” said Iyer. “A mechanism should be devised to ensure that the benefits of it reach the poor and the needy and not the rich.”

Five of the six vaults of the Sree Padmanabhaswamy Temple have been inventoried.

On Saturday, reports leaked to the press revealed that the treasure, including a golden idol of Mahavishnu and a golden ‘anki’, were found in one of the vaults, estimated to weigh 30 kilograms, along with precious stones, silver, two coconut shells of pure gold and another golden idol as well as other jewels and valuable coins. The panel hopes to find more treasure when the sixth and final vault is opened, but the attempt was suspended on Monday because the iron door inside presented “technical problems” requiring further consultation before opening. This vault is thought to contain the bulk of the wealth.

Keralan officials in a preliminary estimate said that the treasure was worth over US$11.2 billion; those estimates have now risen to US$20 billion. Historians say that the temple’s location on a site through which passed lucrative trade routes support the higher evaluations.

“Traders, who used to come from other parts of the country and abroad for buying spices and other commodities, used to make handsome offerings to the deity for not only his blessings but also to please the then rulers,” said P.J. Cherian, the director of Kerala Council for Historic Research

Some suggest that the profit from the sale of the treasure would be enough to wipe out the entire public debt of Kerala and fund future Kerala projects such as seaports, airports and highways.

Thursday, June 23, 2011

NASA’s Cassini–Huygens spacecraft has discovered evidence for a large-scale saltwater reservoir beneath the icy crust of Saturn’s moon Enceladus. The data came from the spacecraft’s direct analysis of salt-rich ice grains close to the jets ejected from the moon. The study has been published in this week’s edition of the journal Nature.

Data from Cassini’s cosmic dust analyzer show the grains expelled from fissures, known as tiger stripes, are relatively small and usually low in salt far away from the moon. Closer to the moon’s surface, Cassini found that relatively large grains rich with sodium and potassium dominate the plumes. The salt-rich particles have an “ocean-like” composition and indicate that most, if not all, of the expelled ice and water vapor comes from the evaporation of liquid salt-water. When water freezes, the salt is squeezed out, leaving pure water ice behind.

Cassini’s ultraviolet imaging spectrograph also recently obtained complementary results that support the presence of a subsurface ocean. A team of Cassini researchers led by Candice Hansen of the Planetary Science Institute in Tucson, Arizona, measured gas shooting out of distinct jets originating in the moon’s south polar region at five to eight times the speed of sound, several times faster than previously measured. These observations of distinct jets, from a 2010 flyby, are consistent with results showing a difference in composition of ice grains close to the moon’s surface and those that made it out to the E ring, the outermost ring that gets its material primarily from Enceladean jets. If the plumes emanated from ice, they should have very little salt in them.

“There currently is no plausible way to produce a steady outflow of salt-rich grains from solid ice across all the tiger stripes other than salt water under Enceladus’s icy surface,” said Frank Postberg, a Cassini team scientist at the University of Heidelberg in Germany.

The data suggests a layer of water between the moon’s rocky core and its icy mantle, possibly as deep as about 50 miles (80 kilometers) beneath the surface. As this water washes against the rocks, it dissolves salt compounds and rises through fractures in the overlying ice to form reserves nearer the surface. If the outermost layer cracks open, the decrease in pressure from these reserves to space causes a plume to shoot out. Roughly 400 pounds (200 kilograms) of water vapor is lost every second in the plumes, with smaller amounts being lost as ice grains. The team calculates the water reserves must have large evaporating surfaces, or they would freeze easily and stop the plumes.

“We imagine that between the ice and the ice core there is an ocean of depth and this is somehow connected to the surface reservoir,” added Postberg.

The Cassini mission discovered Enceladus’ water-vapor and ice jets in 2005. In 2009, scientists working with the cosmic dust analyzer examined some sodium salts found in ice grains of Saturn’s E ring but the link to subsurface salt water was not definitive. The new paper analyzes three Enceladus flybys in 2008 and 2009 with the same instrument, focusing on the composition of freshly ejected plume grains. In 2008, Cassini discovered a high “density of volatile gases, water vapor, carbon dioxide and carbon monoxide, as well as organic materials, some 20 times denser than expected” in geysers erupting from the moon. The icy particles hit the detector target at speeds between 15,000 and 39,000 MPH (23,000 and 63,000 KPH), vaporizing instantly. Electrical fields inside the cosmic dust analyzer separated the various constituents of the impact cloud.

“Enceladus has got warmth, water and organic chemicals, some of the essential building blocks needed for life,” said Dennis Matson in 2008, Cassini project scientist at NASA’s Jet Propulsion Laboratory in Pasadena, California.

“This finding is a crucial new piece of evidence showing that environmental conditions favorable to the emergence of life can be sustained on icy bodies orbiting gas giant planets,” said Nicolas Altobelli, the European Space Agency’s project scientist for Cassini.

“If there is water in such an unexpected place, it leaves possibility for the rest of the universe,” said Postberg.