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Latest Critical point Stories

2013-03-14 19:59:00

Scientist from Dortmund, Helsinki, Potsdam, and the ESRF have revealed details of the microscopic atomic structure of water under extreme conditions. The results have now been published in the Proceedings of the National Academy of Sciences of the USA. Liquid water remains a mystery even after decades of dedicated scientific investigations and researchers still struggle to fully describe its unusual structure and dynamics. At high temperatures and high pressures, water is in the so called...

2011-02-03 18:57:49

New experiments show that common scientific rules can apply to significantly different phenomena operating on vastly different scales. The results raise the possibility of making discoveries pertaining to phenomena that would be too large or impractical to recreate in the laboratory, said Cheng Chin, associate professor in physics and the James Franck Institute at the University of Chicago. Chin and associates Chen-Lung Hung, Xibo Zhang and Nathan Gemelke will publish their results in the...

2010-10-20 19:17:25

Research presented in Albuquerque looks at effect of captured and stored carbon dioxide on minerals The capture and storage of carbon dioxide in deep geologic formations, a strategy for minimizing the impacts of greenhouse gases on global warming, may currently be technologically feasible. But one key question that must be answered is the ability of subsurface materials to maintain their integrity in the presence of supercritical carbon dioxide -- a fluid state in which the gas is condensed...

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2010-07-26 07:52:01

What if work performed in space could improve the treatment of household and nuclear waste on Earth? That's what investigators are hoping to do with the results of a fluid physics study in progress on the International Space Station. The experiment, called DECLIC-HTI, is studying supercritical water that could lead to spin-offs in the field of clean technologies for treating waste here on Earth. A supercritical fluid is any substance at a temperature and pressure above its critical point --...

2010-06-24 04:25:33

Hydrogen is the most abundant element in the universe and is a major component of giant planets such as Jupiter and Saturn. But not much is known about what happens to this abundant element under high-pressure conditions when it transforms from one state to another. Using quantum simulations, scientists at the Lawrence Livermore National Laboratory, the University of Illinois at Urbana-Champaign and the University of L'Aquia in Italy were able to uncover these phase transitions in the...

2010-06-16 22:02:23

The secret life of water just got weirder. For years water has been known to exist in 15 phases -- not just the merry threesome of solid, liquid and gas from grade school science. Now, University of Utah chemists have confirmed the coexistence of ice and liquid after water crystallizes at very low temperatures. They describe their work in the June 21 issue of the Journal of Chemical Physics, which is published by the American Institute of Physics (AIP). It takes more than a swizzle stick and...

2009-06-19 06:19:03

Quantum criticality in chromium is a stand-in for more complex systems Scientists at the U.S. Department of Energy's Argonne National Laboratory and the University of Chicago have reached a milestone in the study of emergent magnetism. Studying simple metallic chromium, the joint UC-Argonne team has discovered a pressure-driven quantum critical regime and has achieved the first direct measurement of a "naked" quantum singularity in an elemental magnet. The team was led by University of...

2008-02-24 03:00:33

By Gong, Wei-Jin Li, Fang; Xi, Dan-Li ABSTRACT: Industrial dyeing wastewater was oxidized in supercritical water in a transpiring-wall reactor, using hydrogen peroxide as an oxidant. Experiments were performed at 595 to 704 K and 18 to 30 MPa, with an oxidant dosage ratio ranging from 0.6 to 2.0. A chemical oxygen demand (COD) removal of more than 98.4% was achieved at 704 K and 28 MPa, with a retention time less than 35 seconds, which increased with the temperature, pressure, and oxidant....

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2005-10-03 19:15:27

NASA -- On a quiet March afternoon in Cleveland, Ohio, Bill Meyer browsed the second floor of Kohl's Department Store. He was just about to buy a pair of shoes at 70 percent off when his cell phone rang. Sighing, he lifted the phone to his ear and said, "Hello?" "Is this William Meyer?" the voice on the other end inquired. "Yes, it is," he replied. "This is CapCom at the Johnson Space Center," the voice said. "Can you get to a land line? You have a phone call from the International Space...


Word of the Day
omphalos
  • The navel or umbilicus.
  • In Greek archaeology: A central boss, as on a shield, a bowl, etc.
  • A sacred stone in the temple of Apollo at Delphi, believed by the Greeks to mark the 'navel' or exact center-point of the earth.
'Omphalos' comes from the ancient Greek.
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