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Growing potatoes on Mars

20.02.2016

The US National Aeronautics and Space Administration (NASA) plans to conduct an experiment simulating the cultivation of potatoes on Mars.

The project will be implemented jointly with the International Potato Center (CIP) in Lima (Peru). For this, 100 kilograms of soil from the Atacama Desert, which is one of the driest places on Earth, will be delivered to a specially equipped laboratory. In some areas of this desert, rain falls only once every few decades.

According to its characteristics, the soil in Atacama is close to Martian - that is why it was chosen for the simulation experiment. In addition, the laboratory will reproduce the atmospheric conditions of the Red Planet.

To date, about 5000 varieties of potatoes are known: of these, approximately 100 will be selected for the experiment. These are varieties that can grow on rocky terrain with a minimum amount of moisture. In addition, the selection criteria are resistance to diseases and sudden changes in climate.

"We are almost 100 percent confident that many of the selected varieties will successfully cope with the test," NASA officials said.

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solar pyrotechnics 20.09.2015

Any talk of electricity these days is viewed through the prism of ever-falling oil prices, which a just-released report from investment bank Goldman Saks has suggested could drop to $20 a barrel. And, since the prism (if we continue the analogy) does not reflect, but refracts light, none of the participants in such a conversation can shed light on why the prices for gasoline or fuel oil, if they fall, then very slightly and in individual countries, but for electricity remain almost unchanged.

Even photovoltaic panels that use free energy from the Sun do not help, since the cost of panels, despite government subsidies, remains very high. And even in Germany, which abandoned nuclear power plants and tries not to pollute the atmosphere with its cheap coal, electricity prices in 2015 for the first time in 10 years fell by an average of 1%, but still remain at the level of 25 cents per kilowatt-hour. True, this price includes 16% VAT, 7% electricity tax, 6% tax on the use of public space for power transmission towers, and 21% tax in favor of renewable energy sources.

The latter tax does not exist only in Germany, and it is from these funds that various advanced developments in the field of solar energy are financed. One of these developments is the invention of South Korean scientists from Yonsei University, which is a hybrid of photovoltaic and pyroelectric effects. The first is characterized by the appearance of a voltage or electric current in a substance under the influence of light, the second - by the appearance of an electric field in the material when its temperature changes.

Similar hybrid devices have been created before, but South Korean researchers claim that the efficiency of their device is 20% higher than that of a conventional solar panel, and the amount of energy produced is five times greater than that of competing hybrids.

The device uses a Graetzel cell - a dye-sensitized solar cell, which is mounted on a transparent electrically conductive film made of PEDOT (3,4-ethylenedioxythiophene) polymer. Under this film there is another film of pyroelectric material with a thermoelectric converter. When sunlight or other light of the same spectrum hits a photovoltaic cell, it generates electricity. Light that does not hit the cell passes through the polymer film and heats it up. The thermoelectric converter then uses the heat to generate additional electricity.

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