Posts tagged England
CU RESEARCHERS DEVELOP NEW SOFTWARE TO ADVANCE BRAIN IMAGE RESEARCH
Jun 26th
A University of Colorado Boulder research team has developed a new software program allowing neuroscientists to produce single brain images pulled from hundreds of individual studies, trimming weeks and even months from what can be a tedious, time-consuming research process.
The development of noninvasive neuroimaging techniques such as functional magnetic resonance imaging, or fMRI, spurred a huge amount of scientific research and led to substantial advances in the understanding of the human brain and cognitive function. However, instead of having too little data, researchers are besieged with too much, according to Tal Yarkoni, a postdoctoral fellow in CU-Boulder’s psychology and neuroscience department.
The new software developed by Yarkoni and his colleagues can be programmed to comb scientific literature for published articles relevant to a particular topic, and then to extract all of the brain scan images from those articles. Using a statistical process called “meta-analysis,” researchers are then able to produce a consensus “brain activation image” reflecting hundreds of studies at a time.
“Because the new approach is entirely automated, it can analyze hundreds of different experimental tasks or mental states nearly instantaneously instead of requiring researchers to spend weeks or months conducting just one analysis,” said Yarkoni.
Yarkoni is the lead author on a paper introducing the new approach to analyzing brain imaging data that appears in the June 26 edition of the journal Nature Methods. Russell Poldrack of the University of Texas at Austin, Thomas Nichols of the University of Warwick in England, David Van Essen of Washington University in St. Louis and Tor Wager of CU-Boulder contributed to the paper.
Brain scanning techniques such as fMRI have revolutionized scientists’ understanding of the human mind by allowing researchers to peer deep into people’s brains as they engage in mental activities as diverse as reciting numbers, making financial decisions or simply daydreaming. But interpreting the results of brain imaging studies is often more difficult, according to Yarkoni.
“There’s often the perception that what we’re doing when we scan someone’s brain is literally seeing their thoughts and feelings in action, but it’s actually much more complicated,” Yarkoni said. “The colorful images we see are really just estimates, because each study gives us a somewhat different picture. It’s only by combining the results of many different studies that we get a really clear picture of what’s going on.”
The ability to look at many different mental states simultaneously allows researchers to ask interesting new questions. For instance, researchers can pick out a specific brain region they’re interested in and determine which mental states are most likely to produce activation in that region, he said. Or they can calculate how likely a person is to be performing a particular task given their pattern of brain activity.
In their study, the research team was able to distinguish people who were experiencing physical pain during brain scanning from people who were performing a difficult memory task or viewing emotional pictures with nearly 80 percent accuracy. The team expects performance levels to improve as their software develops, and believes their tools will improve researchers’ ability to decode mental states from brain activity.
“We don’t expect to be able to tell what people are thinking or feeling at a very detailed level,” Yarkoni said. “But we think we’ll be able to distinguish relatively broad mental states from one another. And we’re hopeful that might even eventually extend to mental health disorders, so that these tools will be useful for clinical diagnosis.”
STRONGEST EVIDENCE YET INDICATES ICY SATURN MOON HIDING SALTWATER OCEAN
Jun 22nd
The new discovery was made during the Cassini-Huygens mission to Saturn, a collaboration of NASA, the European Space Agency and the Italian Space Agency. Launched in 1997, the mission spacecraft arrived at the Saturn system in 2004 and has been touring the giant ringed planet and its vast moon system ever since.
The plumes shooting water vapor and tiny grains of ice into space were originally discovered emanating from Enceladus — one of 19 known moons of Saturn — by the Cassini spacecraft in 2005. The plumes were originating from the so-called “tiger stripe” surface fractures at the moon’s south pole and apparently have created the material for the faint E Ring that traces the orbit of Enceladus around Saturn.
During three of Cassini’s passes through the plume in 2008 and 2009, the Cosmic Dust Analyser, or CDA, on board measured the composition of freshly ejected plume grains. The icy particles hit the detector’s target at speeds of up to 11 miles per second, instantly vaporizing them. The CDA separated the constituents of the resulting vapor clouds, allowing scientists to analyze them.
The study shows the ice grains found further out from Enceladus are relatively small and mostly ice-poor, closely matching the composition of the E Ring. Closer to the moon, however, the Cassini observations indicate that relatively large, salt-rich grains dominate.
“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 the salt water under Enceladus’ icy surface,” said Frank Postberg of the University of Germany, lead author of a study being published in Nature on June 23. Other co-authors include Jürgen Schmidt from the University of Potsdam, Jonathan Hillier from Open University headquartered in Milton Keynes, England, and Ralf Srama from the University of Stuttgart.
“The study indicates that ‘salt-poor’ particles are being ejected from the underground ocean through cracks in the moon at a much higher speed than the larger, salt-rich particles,” said CU-Boulder faculty member and study co-author Sascha Kempf of the Laboratory for Atmospheric and Space Physics.
“The E Ring is made up predominately of such salt-poor grains, although we discovered that 99 percent of the mass of the particles ejected by the plumes was made up of salt-rich grains, which was an unexpected finding,” said Kempf. “Since the salt-rich particles were ejected at a lower speed than the salt-poor particles, they fell back onto the moon’s icy surface rather than making it to the E Ring.”
According to the researchers, the salt-rich particles have an “ocean-like” composition that indicates most, if not all, of the expelled ice comes from the evaporation of liquid salt water rather than from the icy surface of the moon. When salt water freezes slowly the salt is “squeezed out,” leaving pure water ice behind. If the plumes were coming from the surface ice, there should be very little salt in them, which was not the case, according to the research team.
The researchers believe that perhaps 50 miles beneath the surface crust of Enceladus a layer of water exists between the rocky core and the icy mantle that is kept in a liquid state by gravitationally driven tidal forces created by Saturn and several neighboring moons, as well as by heat generated by radioactive decay.
According to the scientists, roughly 440 pounds of water vapor is lost every second from the plumes, along with smaller amounts of ice grains. Calculations show the liquid ocean must have a sizable evaporating surface or it would easily freeze over, halting the formation of the plumes. “This study implies that nearly all of the matter in the Enceladus plumes originates from a saltwater ocean that has a very large evaporating surface,” said Kempf.
Salt in the rock dissolves into the water, which accumulates in a liquid ocean beneath the icy crust, according to the Nature authors. When the outermost layer of the Enceladus crust cracks open, the reservoir is exposed to space. The drop in pressure causes the liquid to evaporate into a vapor, with some of it “flash-freezing” into salty ice grains, which subsequently creates the plumes, the science team believes.
“Enceladus is a tiny, icy moon located in a region of the outer Solar System where no liquid water was expected to exist because of its large distance from the sun,” said Nicolas Altobelli, ESA’s project scientist for the Cassini-Huygens mission. “This finding is therefore a crucial new piece of evidence showing that environmental conditions favorable to the emergence of life may be sustainable on icy bodies orbiting gas giant planets.”
The Huygens probe was released from the main spacecraft and parachuted through the atmosphere to the surface of Saturn’s largest moon, Titan, in 2005.
The Cassini spacecraft is carrying 12 science instruments, including a $12.5 million CU-Boulder ultraviolet imaging spectrograph designed and built by a LASP team led by Professor Larry Esposito.
Titanic Sinks in North Atlantic 1500 feared drown; developing
Apr 15th
Titanic Sinks Four Hours After Hitting Iceberg; 866 Rescued By Carpathia, Probably 1,250 Perish; Ismay Safe, Mrs. Astor Maybe, Noted Names Missing
Biggest Liner Plunges to the Bottom at 2:20 A.M. RESCUERS THERE TOO LATE
Expect to Pick Up the Few Hundreds Who Took to the Lifeboats.
WOMEN AND CHILDREN FIRST
Cunarder Carpathia Rushing to New York with the Survivors.
SEA SEARCH FOR OTHERS
The California Stands By on Chance of Picking Up Other Boats or Rafts.
OLYMPIC SENDS THE NEWS
Only Ship to Flash Wireless Messages to Shore After the Disaster.
Special to The New York Times
RELATED HEADLINESCol. Astor and Bride, Isidor Straus and Wife and Maj. Butt Aboard
“RULE OF SEA” FOLLOWED Women and Children Put Over in Lifeboats and Are Supposed to be Safe on Carpathia PICKED UP AFTER 8 HOURS Vincent Astor Calls at White Star Office for News of His Father and Leaves Weeping. Franklin Hopeful All Day Manager of Line Insisted Titanic Was Unsinkable Even After She Had Gone Down HEAD OF THE LINE ABOARD J.Bruce Ismay Making First Trip on Gigantic Ship That Was to Surpass All Others |
CAPE RACE, N.F., April 15. — The White Star liner Olympic reports by wireless this evening that the Cunarder Carpathia reached, at daybreak this morning, the position from which wireless calls for help were sent out last night by the Titanic after her collision with an iceberg. The Carpathia found only the lifeboats and the wreckage of what had been the biggest steamship afloat.
The Titanic had foundered at about 2:20 A.M., in latitude 41:46 north and longitude 50:14 west. This is about 30 minutes of latitude, or about 34 miles, due south of the position at which she struck the iceberg. All her boats are accounted for and about 655 souls have been saved of the crew and passengers, most of the latter presumably women and children. There were about 1,200 persons aboard the Titanic.
The Leyland liner California is remaining and searching the position of the disaster, while the Carpathia is returning to New York with the survivors.
It can be positively stated that up to 11 o’clock to-night nothing whatever had been received at or heard by the Marconi station here to the effect that the Parisian, Virginian or any other ships had picked up any survivors, other than those picked up by the Carpathia.
First News of the Disaster.
The first news of the disaster to the Titanic was received by the Marconi wireless station here at 10:25 o’clock last night (as told in yesterday’s New York Times.) The Titanic was first heard giving the distress signal “C. Q. D.,” which was answered by a number of ships, including the Carpathia, the Baltic and the Olympic. The Titanic said she had struck an iceberg and was in immediate need of assistance, giving her position as latitude 41:46 north and longitude 50:14 west.
At 10:55 o’clock the Titanic reported she was sinking by the head, and at 11:25 o’clock the station here established communication with the Allan liner Virginian, from Halifax to Liverpool, and notified her of the Titanic’s urgent need of assistance and gave her the Titanic’s position.
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The Virginian advised the Marconi station almost immediately that she was proceeding toward the scene of the disaster.
At 11:36 o’clock the Titanic informed the Olympic that they were putting the women off in boats and instructed the Olympic to have her boats read to transfer the passangers.
The Titanic, during all this time, continued to give distress signals and to announce her position.
The wireless operator seemed absolutely cool and clear-headed, his sending throughout being steady and perfectly formed, and the judgment used by him was of the best.
The last signals heard from the Titanic were received at 12:27 A.M., when the Virginian reported having heard a few blurred signals which ended abruptly.
The largest passenger steamship in the world, the Olympic-class RMS Titanic was owned by the White Star Line and constructed at theHarland and Wolff shipyard in Belfast, Ireland. She set sail for New York City on 10 April 1912 with 2,223 people on board. The high casualty rate resulting from the sinking was due in part to the fact that, although complying with the regulations of the time, the ship carried lifeboats for only 1,178 people. A disproportionate number of men died due to the “women and children first” protocol that was enforced by the ship’s crew.
Titanic was designed by experienced engineers, using some of the most advanced technologies and extensive safety features of the time. Adding to the ironic nature of the tragedy is the fact that the liner sank on her maiden voyage. The high loss of life, the media frenzy overTitanic‘s famous victims, the legends about the sinking, the resulting changes in maritime law, and the discovery of the wreck have all
RMS Titanic was a passenger liner that struck an iceberg on her maiden voyage from Southampton, England, to New York City, and sank on 15 April 1912. She hit the iceberg four days into the crossing, at 23:40 on 14 April 1912, and sank at 2:20 the following morning, resulting in the deaths of 1,517 people in one of the deadliest peacetime maritime disasters in history.