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Voice controls home appliances

23.02.2002

Toshiba has developed a headset that allows you to control home and audio equipment with voice commands. The novelty allows you to establish a wireless connection with devices equipped with a Bluetooth port.

By wearing a headset, you can listen to music from the Internet and record your voice from the microphone to the hard disk within 10 m from the computer. The head phone is powered by a lithium-ion battery, which ensures the operation of the device for 5 hours. The cost of a new device will not exceed $80.

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Artificial tungsten sheet 13.10.2016

A cheap catalyst will help create hydrocarbons from sunlight and air without the help of plants.

One way to combat greenhouse gas carbon dioxide is to turn it into a hydrocarbon, that is, into a fuel. This can be done by a device called an artificial leaf (similar to a regular green leaf that converts CO2 into carbohydrates through photosynthesis). Such a device was made by chemists at the University of Illinois under the leadership of Amin Salekhi-Khojin with financial support from the Department of Energy and the US National Science Foundation.

As in natural photosynthesis, the source of energy is sunlight. This energy is used with the help of a catalyst to reduce carbon, and synthesis gas is obtained: a mixture of hydrogen and carbon monoxide. It can either be burned or sent to the production of hydrocarbons. Until now, the efficiency of such leaves has left much to be desired, besides their catalysts are made of noble metals.

Salekhi-Khojin decided to use tungsten diselenide nanosheets. This substance perfectly restores carbon dioxide, but is quickly poisoned by the products of reduction. Protection was found - it served as an ionic liquid, ethyl-methyl-imidazole tetrafluoroborate, mixed with water in a ratio of 1: 1. A cell with a liquid and a catalyst was attached to the cathode of a silicon solar battery, and a cell with an electrolyte of cobalt oxide in potassium phosphate was attached to the anode. Under the action of sunlight, which is captured by a silicon battery, oxygen and a hydrogen ion are formed at the anode, the latter enters the cathode cell, reduces carbon, and bubbles of hydrogen and carbon monoxide are released in it.

Such an artificial sheet is a thousand times more productive and twenty times cheaper than one made with a noble metal catalyst. However, the competitive price of the fuel obtained by such a sheet is still very far away - obviously, therefore, the researchers plan to offer their method to the Martian colonists, who will not have any alternative source of hydrocarbons.

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