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Věda a technika - Technika - - 4. března 2019

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Study: Nuking Asteroids Into Smithereens Harder Than Previously Thought (VIDEO)

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enclosure image A new and more comprehensive model of the processes that play out when two asteroids collide suggests that it’s actually a lot harder to blow up big rocks than previously believed. While cracking them is easy, overcoming gravity in the long term is another thing. However, humanity also has other options for redirecting deadly space rocks. Číst dále >>> Přeložit do en

Step right up for bigger 2D sheets

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Small steps make a big difference in the growth of 2D crystals. A new theory demonstrates why. Číst dále >>> Přeložit do en

Step right up for bigger 2D sheets

Náhled

Small steps make a big difference in the growth of 2D crystals. A new theory demonstrates why. Číst dále >>> Přeložit do en

The force is with us, always? Tuning quantum vacuum forces from attractive to repulsive

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Scientists can put two uncharged metal plates close together in a vacuum, and 'voila!' -- they will attract each other. In 1948, Dutch theoretical physicist Hendrick Casimir first predicted an attractive force responsible for this effect. Scientists have wondered, can there be an equal yet opposite kind of Casimir force? Physicists have shown for the first time that the Casimir force can be reversed and made repulsive, tunable or enhanced, based on the material inserted in between the plates. Číst dále >>> Přeložit do en

The force is with us, always? Tuning quantum vacuum forces from attractive to repulsive

Náhled

Scientists can put two uncharged metal plates close together in a vacuum, and 'voila!' -- they will attract each other. In 1948, Dutch theoretical physicist Hendrick Casimir first predicted an attractive force responsible for this effect. Scientists have wondered, can there be an equal yet opposite kind of Casimir force? Physicists have shown for the first time that the Casimir force can be reversed and made repulsive, tunable or enhanced, based on the material inserted in between the plates. Číst dále >>> Přeložit do en

Wildfire risk in California no longer coupled to winter precipitation

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Wet winters no longer predict possible relief from severe wildfires for California. Now, fuel buildup from decades of fire suppression in the 20th century plus rising temperatures from climate change means any year may have large fires, no matter how wet the previous winter, according to a new study. Číst dále >>> Přeložit do en

Thousands of tiny quakes shake Antarctic ice at night

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Scientists placed seismometers on the McMurdo Ice Shelf and recorded hundreds of thousands of tiny 'ice quakes' that appear to be caused by pools of partially melted ice expanding and freezing at night. The phenomenon may be able to help scientists track glacier melting -- and to help explain the breakup of large ice shelves. Číst dále >>> Přeložit do en

Researchers uncover new facets of HIV's 'arms race' with human defense system

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A new study reveals details about the evolutionary contest between HIV and the human immune system that could one day improve treatment. Číst dále >>> Přeložit do en

Strana: 1/ 14 Celkem nalezeno 136 záznamů.

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