Scientists at the Hebrew University of Jerusalem have demonstrated that sea spray over the oceans contributes to cleansing air that has been polluted overland. The air pollution is washed down by rain, which occurs because the rain-suppressing effect of such pollution is significantly neutralized. An article on this research appears in the online magazine Science Express, published today.
In previous studies, Prof. Daniel Rosenfeld of the Ring Department of Atmospheric Sciences, and colleagues from the Hebrew University and elsewhere have shown that particles generated by such elements as urban pollution, desert dust and burning of vegetation hinder precipitation by creating nuclei in clouds around which droplets are formed. These droplets are too small to bond together to form actual raindrops, thereby reducing rainfall.
The new observations by Prof. Rosenfeld, together with Hebrew University Ph.D. student Ronen Lahav, Prof. Alexander Khain and Dr. Mark Pinsky, show that precipitation from similar polluted clouds over the ocean is much less affected, because large sea salt nuclei seed the clouds and override the precipitation-suppression effect of the pollution nuclei. Raindrops initiated by the sea salt grow by collecting small cloud droplets that form on the pollution particles, thereby cleansing the air and increasing rainfall prospects.
Heidi Gleit | Hebrew University
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Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.
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Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
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For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
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An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
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A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
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