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Věda a technika - Hlavní události ve vědě - - květen 2019

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Strana: 1/ 735 Celkem nalezeno 7341 záznamů.

Konečně se alespoň v Číně reaktory budují bez zpoždění

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V Číně zahájily testy za studena prvního referenčního bloku HPR1000 (Hualong One). Budování tohoto reaktoru probíhá v předstihu před plánem a i u ostatních bloků tohoto typu jde zatím výstavba velmi dobře. Zdá se, že by se HPR1000 mohl stát vlajkovou lodí Číny v oblasti reaktorů III. Generace. Číst dále >>>

What We Know (And Don't) About Tornadoes And Climate Change

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Research shows there's been an increase in tornado clusters and that twister activity is shifting eastward. Is there a fingerprint of planetary warming? Číst dále >>> Přeložit do en

Kolumbijský soud osvobodil exšéfa gerily FARC, jeho vydání žádají Američané

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Spor o jeho osud v posledních měsících ohrožuje mírovou dohodu kolumbijské vlády s kdysi největší gerilou v zemi. Číst dále >>>

To curb infection, bacteria direct their defenses against themselves

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To fight off invading viruses, bacteria have evolved a slew of creative defense tactics. New research shows that in some cases, microbes go to great lengths to keep an infection from spreading, even destroying bits of their own genetic material. Číst dále >>> Přeložit do en

To curb infection, bacteria direct their defenses against themselves

Náhled

To fight off invading viruses, bacteria have evolved a slew of creative defense tactics. New research shows that in some cases, microbes go to great lengths to keep an infection from spreading, even destroying bits of their own genetic material. Číst dále >>> Přeložit do en

Environmentalist Shellenberger: We Shouldn’t Be Surprised Renewables Make Energy Expensive Since That’s Always Been The Greens’ Goal

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Michael Shellenberger: Like a lot of people, I used to think that subsidies to promote the switch from fossil fuels to solar and wind would be a one-time thing. Once a solar or wind farm was built, I thought, it would produce electricity forever, without further subsidy, because sunlight and wind are free. Renewables would thus allow a “sustainable” and even “circular” economy without waste or mining because everything would be recycled. But it turns out that only nuclear can produce sufficient clean energy to power a circular economy. That’s partly because nuclear plants have seen their efficiency increase dramatically. Nuclear plants used to operate for just 50% of the year. Now, thanks to greater experience in operations and maintenance, they operate 93%of the year. Environmentalists have for decades argued that energy is too cheap and must be made more expensive in order to protect the environment. Greens viewed energy as the source of humankind’s destruction of the natural world and sought to restrict energy supplies in order to slow and eventually reverse the destruction. Indeed, the reason environmentalists turned against nuclear energy in the 1960s was that it was cheap and effectively infinite. Greens got the relationship between energy and the environment backward. As people consume higher levels of energy the overall environmental impact is overwhelmingly positive, not negative. As we consume greater amounts of energy we can live in cities, stop using wood as fuel, and afford to have fewer children. And as humans use more energy for agriculture in the form of tractors and fertilizers, we are able to grow more food on less land, allowing marginal lands to return to grasslands, forests, and wildlife. Unlike the original New Deal, a Green New Deal would thus result in what Greens call “de-growth,” not growth. Číst dále >>> Přeložit do en

Laser technique could unlock use of tough material for next-generation electronics

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Researchers used a laser technique to permanently stress graphene into a structure that allows the flow of electric current, which is necessary for the material to be useful for next-generation electronics. Číst dále >>> Přeložit do en

Cancer-fighting combination targets glioblastoma

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An international team of researchers combined a calorie-restricted diet high in fat and low in carbohydrates with a tumor-inhibiting antibiotic and found the combination destroys cancer stem cells and mesenchymal cells, the two major cells found in glioblastoma, a fast-moving brain cancer that resists traditional treatment protocols. Číst dále >>> Přeložit do en

New framework helps gauge impact of mosquito control programs

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Effective methods of controlling mosquito populations are needed to help lower the worldwide burden of mosquito-borne diseases including Zika, chikungunya, and dengue. Now, researchers have described a new statistical framework that can be used to assess mosquito control programs over broad time and space scales. Číst dále >>> Přeložit do en

New framework helps gauge impact of mosquito control programs

Náhled

Effective methods of controlling mosquito populations are needed to help lower the worldwide burden of mosquito-borne diseases including Zika, chikungunya, and dengue. Now, researchers have described a new statistical framework that can be used to assess mosquito control programs over broad time and space scales. Číst dále >>> Přeložit do en

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