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Glaciers are melting on Everest

26.03.2019

On the slopes of Mount Everest (Chomolungma), in recent years, the bodies of dead climbers have been increasingly found. This is due to the melting of glaciers. A growing body of evidence points to rapid glacier melt in the Everest region and the Himalayas in general.

In the decades that have passed since the beginning of ascents to the peak, almost 300 climbers have died in these places. Two-thirds of them remain buried under a layer of snow and ice. The record for the number of deaths was the 2015 season, when 24 people died due to landslides and avalanches while climbing.

In total, more than 4 thousand people tried to conquer the summit of Everest.

In 2016, the Nepalese military drained Lake Imja at the foot of the mountain, which had overflowed as a result of the rapid melting of neighboring glaciers.

Another group of British glaciologists drilled on the surface of the Khumbu Glacier last year and found that the ice is warmer than expected. Ice samples collected showed a temperature of only minus 3,3 degrees Celsius, which is 2 degrees higher than the average annual air temperature in the area. "Due to global warming, the glaciers on the mountain slopes are melting fast, and the bodies of the dead, which were hidden by ice all these years, are becoming visible," says Ang Tenzing, former president of the Nepal Mountaineering Association.

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Power consumption of OLED displays will decrease 24.11.2013

Specialists working at the universities of Bonn and Regensburg have managed to develop a new type of organic light emitting diodes (OLED). As stated, the development will create low-cost and low-power displays for mobile devices, computers and televisions. It is also possible to use the development in lighting fixtures.

Modern OLEDs have many advantages, but they also have disadvantages. One of them is low efficiency. Only one fourth of the electricity that feeds the OLED can be converted into light. You can improve the indicator with the help of rare and expensive metals, such as platinum or iridium.

OLEDs of a new type, created by German scientists in collaboration with their colleagues from the United States, are characterized by higher efficiency, and at the same time they do not use rare metals.

In OLED, light is generated by the recombination of positive and negative charge carriers. In this case, light appears only if the pair of carriers has oppositely directed spins. Otherwise, heat is generated. The presence of the mentioned metals helps to give the required value of the magnetic moment.

On the other hand, if one could wait for some time, each charge could already find a more suitable one in terms of emitting light when they collide. However, in a conventional OLED, the interaction of positive and negative charges occurs without any delay. The new LED has "waiting" conditions, which increase efficiency.

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