Submitted by Anonymous (not verified) on Thu, 2002-07-18 07:00
Most natural smells are complex blends of many individual chemicals. Freshly ground coffee, for example, contains about 300 individual volatile components. A typical perfume also contains tens of ingredients, although the recipes are tightly locked in secret vaults.
The percepts that such complex blends evoke in us are, however, astonishingly singular: ground coffee smells like coffee, not like a hopeless mess of hundreds of ingredients; Gio or Allure also have unique signatures (often associated with other memories).
Submitted by Anonymous (not verified) on Wed, 2002-07-10 07:00
Four volcanoes in the central Andes mountains of South America, all previously thought to be dormant, must now be considered active due to ground motions detected from space, geophysicists say.
In a paper appearing in the July 11 issue of the journal "Nature", California Institute of Technology geophysics graduate student Matt Pritchard and his faculty adviser, Mark Simons, unveil their analysis of eight years of radar interferometry data taken on 900 volcanoes in the Andes.
Submitted by Anonymous (not verified) on Thu, 2002-06-20 07:00
High-temperature superconductors have long been the darlings of materials science because they can transfer electrical current with no resistance or heat loss. Already demonstrated in technologies such as magnetic sensors, magnetic resonance imaging (MRI), and microwave filters in cellular-phone base stations, superconductors are potentially one of the greatest technological triumphs of the modern world if they could just be made to operate more reliably at higher temperatures.
Submitted by Anonymous (not verified) on Mon, 2002-06-10 07:00
Caltech scientists discover that the African superplume has edges that are sharp and distinct, not diffuse and blurred.
Submitted by Anonymous (not verified) on Thu, 2002-06-06 07:00
Astrophysical jets are one of the truly exotic sights in the universe. They are usually associated with accretion disks, which are disks of matter spiraling into a central massive object such as a star or a black hole. The jets are very narrow and shoot out along the disk axis for huge distances at incredibly high speeds.
Jets and accretion disks have been observed to accompany widely varying types of astrophysical objects, ranging from proto-star systems to binary stars to galactic nuclei.
Submitted by Anonymous (not verified) on Fri, 2002-05-31 07:00
Astrophysicists at the California Institute of Technology, using the Palomar 200-inch telescope, have uncovered evidence that a special type of pulsar has the strongest magnetic field in the universe.
Submitted by Anonymous (not verified) on Wed, 2002-05-29 07:00
A rare type of ammonia that includes three atoms of deuterium has been found in a molecular cloud about 1,000 light-years from Earth. The comparative ease of detecting the molecules means there are more of them than previously thought.
In a study appearing in the May 20 issue of the Astrophysical Journal Letters, an international team of astronomers reports on the contents of a molecular cloud in the direction of the constellation Perseus. The observations were done with the Caltech Submillimeter Observatory atop Mauna Kea in Hawaii.
Submitted by Anonymous (not verified) on Thu, 2002-05-23 07:00
Cosmologists from the California Institute of Technology using a special instrument high in the Chilean Andes have uncovered the finest detail seen so far in the cosmic microwave background radiation (CMB), which originates from the era just 300,000 years after the Big Bang.
Submitted by Anonymous (not verified) on Thu, 2002-05-16 07:00
In two papers appearing in an upcoming issue of the Astrophysical Journal, an international team of astrophysicists led by Shri Kulkarni of the California Institute of Technology reveals that new data show that supernovae are the source of gamma-ray bursts.
The new information was obtained from a gamma-ray burst that was detected in November and studied by the Hubble Space Telescope, the Australia Telescope Compact Array, the Anglo-Australian Telescope, and optical telescopes in Chile.
Submitted by Anonymous (not verified) on Thu, 2002-05-09 07:00
Scientists have unraveled a mystery about hydrogen peroxide that may lead to a more accurate way of measuring a gas that contributes to depletion of Earth's ozone layer.