Mastodons were large tusked mammal species of the extinct genus Mammut which inhabited Asia, Africa, Europe, North America and Central America from the Oligocene through Pleistocene, 33.9 mya to 11,000 years ago. The American mastodon is the most recent and best known species of the group.
The American mastodon, Mammut americanum, lived from about 3.7 million years ago until about 10,000 BC. It was the last surviving member of the mastodon family. It is known from fossils found ranging from present-day Alaska and New England in the north, to Florida, southern California, and as far south as Honduras and El Salvador.
http://en.wikipedia.org/wiki/Mastodon
Wednesday, February 23, 2011
Cryogenic energy storage
Cryogenic energy storage plant could provide valuable back-up | News | The Engineer
"The UK’s first cryogenic power storage plant, which uses liquid nitrogen to store and release energy, is scheduled to open next month. Its operator, Highview Power Storage, said the system could provide a relatively cheap way of storing power, particularly from intermittent sources such as wind turbines, to better match the supply of electricity to demand.The pilot facility near Slough has been providing electricity to the National Grid since April last year by evaporating liquid nitrogen stored at -200ºC to drive turbine generators. Highview is now installing equipment to re-liquefy and compress the nitrogen using electricity from the grid, creating a closed cryogenic system that can store energy at times of surplus and release it when it is needed, while re-using the cold air exhaust."
"The UK’s first cryogenic power storage plant, which uses liquid nitrogen to store and release energy, is scheduled to open next month. Its operator, Highview Power Storage, said the system could provide a relatively cheap way of storing power, particularly from intermittent sources such as wind turbines, to better match the supply of electricity to demand.The pilot facility near Slough has been providing electricity to the National Grid since April last year by evaporating liquid nitrogen stored at -200ºC to drive turbine generators. Highview is now installing equipment to re-liquefy and compress the nitrogen using electricity from the grid, creating a closed cryogenic system that can store energy at times of surplus and release it when it is needed, while re-using the cold air exhaust."
Lanzan pájaro espía
Un miniavión espía en forma de colibrí que funciona a control remoto fue presentado por el Pentágono.
Tuesday, February 22, 2011
Dancing galaxies
Il Sole24ore propone una collezione di immagini con la danza delle galassie. Vedi
http://foto.ilsole24ore.com/SoleOnLine5/Tecnologie/Scienza/2011/danza-galassie/danza-galassie_fotogallery.php?id=2
http://foto.ilsole24ore.com/SoleOnLine5/Tecnologie/Scienza/2011/danza-galassie/danza-galassie_fotogallery.php?id=2
A stellar superfluid
Physics - A stellar superfluid, is the Nicolas Chamel's viewpoint on the paper:
Rapid Cooling of the Neutron Star in Cassiopeia A Triggered by Neutron Superfluidity in Dense Matter
Dany Page, Madappa Prakash, James M. Lattimer, and Andrew W. Steiner
Phys. Rev. Lett. 106, 081101 (2011) – Published February 22, 2011
Download PDF (free)
Friday, February 18, 2011
Physicists create 'anti-laser'
Physicists create 'anti-laser' - physicsworld.com
"In a fascinating case of physics being turned on its head, a group of researchers at Yale University in the US has created an "anti-laser" that almost perfectly absorbs incoming beams of coherent light. The invention is based on a theoretical study reported last summer in which Douglas Stone and his Yale colleagues claimed that such a system could be possible in a device that they call a coherent perfect absorber (CPA). Instead of generating coherent light beams with a laser, the devices absorb incoming coherent light and convert it into either heat or electricity."
DNA puts a new spin on electrons
DNA puts a new spin on electrons - physicsworld.com
"A new and highly efficient way of filtering electrons according to their spin has been built using double strands of DNA. The technique, which has been developed by physicists in Israel and Germany, is about three times more efficient than using magnet-based spin filters. The method could be used in spintronic circuits, which exploit both the spin and charge of electrons, and could even lead to a better understanding of the possible role that spin plays in biological processes."
"A new and highly efficient way of filtering electrons according to their spin has been built using double strands of DNA. The technique, which has been developed by physicists in Israel and Germany, is about three times more efficient than using magnet-based spin filters. The method could be used in spintronic circuits, which exploit both the spin and charge of electrons, and could even lead to a better understanding of the possible role that spin plays in biological processes."
Wednesday, February 9, 2011
The Sun in 3D
"Beginning on February 6, 2011, the two STEREO spacecraft are 180 degrees apart providing Naval Research Laboratory scientists with a 360-degree view of the Sun. NASA's STEREO (Solar Terrestrial Relations Observatory) spacecraft were launched on October 25, 2006, and have been gathering spectacular images of solar activity, especially solar storms, since the mission began."
More http://www.nrl.navy.mil/pao/pressRelease.php?Y=2011&R=22-11r and http://stereo.gsfc.nasa.gov/360blog/
A 3D movie at the page:
http://www.nasa.gov/mission_pages/stereo/multimedia/AnaglyphFull171Movie.html
http://www.nasa.gov/mission_pages/stereo/multimedia/AnaglyphFull171Movie.html
Sunday, February 6, 2011
Two splendid suns
"Earth could be getting a second sun, at least temporarily. Dr. Brad Carter, Senior Lecturer of Physics at the University of Southern Queensland, outlined the scenario to news.com.au. Betelgeuse, one of the night sky's brightest stars, is losing mass, indicating it is collapsing. It could run out of fuel and go super-nova at any time.
When that happens, for at least a few weeks, we'd see a second sun, Carter says. There may also be no night during that timeframe."
When that happens, for at least a few weeks, we'd see a second sun, Carter says. There may also be no night during that timeframe."
More The Huffington Post