New theory on drizzle formation says a few big drops get all the water
In research that could lead to more accurate weather forecasts and climate models, scientists at the U.S. Department of Energys Brookhaven National Laboratory say a physical limit on the number of cloud droplets that grow big enough to form drizzle paradoxically makes drizzle form faster. Thats because those few droplets that cross the drizzle "barrier" readily collect enough surrounding droplets to fall -- instead of staying stuck in the clouds competing for a limited water supply and never getting quite big enough.
Atmospheric physical chemist Robert McGraw, lead author of the Brookhaven study, will present this research on Thursday, August 26, 2004, at the 228th national meeting of the American Chemical Society in Philadelphia, Pennsylvania (Pennsylvania Convention Center, Room 103A, 9:40 a.m. Eastern Time), together with Brookhaven cloud physicist and co-author Yangang Liu. The research will also be published in an upcoming edition of Physical Review E.
Karen McNulty Walsh | EurekAlert!
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University of Connecticut researchers have created a biodegradable composite made of silk fibers that can be used to repair broken load-bearing bones without the complications sometimes presented by other materials.
Repairing major load-bearing bones such as those in the leg can be a long and uncomfortable process.
Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.
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Novel highly efficient and brilliant gamma-ray source: Based on model calculations, physicists of the Max PIanck Institute for Nuclear Physics in Heidelberg propose a novel method for an efficient high-brilliance gamma-ray source. A giant collimated gamma-ray pulse is generated from the interaction of a dense ultra-relativistic electron beam with a thin solid conductor. Energetic gamma-rays are copiously produced as the electron beam splits into filaments while propagating across the conductor. The resulting gamma-ray energy and flux enable novel experiments in nuclear and fundamental physics.
The typical wavelength of light interacting with an object of the microcosm scales with the size of this object. For atoms, this ranges from visible light to...
Stable joint cartilage can be produced from adult stem cells originating from bone marrow. This is made possible by inducing specific molecular processes occurring during embryonic cartilage formation, as researchers from the University and University Hospital of Basel report in the scientific journal PNAS.
Certain mesenchymal stem/stromal cells from the bone marrow of adults are considered extremely promising for skeletal tissue regeneration. These adult stem...
In the fight against cancer, scientists are developing new drugs to hit tumor cells at so far unused weak points. Such a “sore spot” is the protein complex...
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