ALMA получил самое детальное изображение Бетельгейзе😃Красный сверхгигант…

ALMA получил самое детальное изображение Бетельгейзе😃

Красный сверхгигант Бетельгейзе будоражит умы ученых на протяжении десятилетий. Проживающая в созвездии Ориона звезда в обозримом будущем подвергнется взрыву сверхновой, и, когда это произойдет, она будет видна с Земли невооруженным глазом даже средь бела дня.

Бетельгейзе удалена от нас примерно на 600 световых лет. Красный сверхгигант пылает ярко и сгорит значительно быстрее Солнца. Его жизнь очень коротка. Звезде около восьми миллионов лет, и она уже на пороге становления сверхновой.

Новый снимок, полученный массивом телескопов Европейской южной обсерватории (ESO) ALMA, демонстрирует потенциальную сверхновую во всей красе. Это первый случай, когда ALMA наблюдал поверхность звезды, и попытка привела к появлению самого четкого на сегодняшний день изображения Бетельгейзе.В миллиметровом континууме звезда превышает Солнце в 1400 раз. Ранее звезда наблюдалась на разных длинах волн, в том числе в видимых, инфракрасных и ультрафиолетовых. С помощью Очень Большого Телескопа ESO астрофизики обнаружили огромный шлейф газа, сопоставимый по размеру с Солнечной системой. Кроме того, исследователи наблюдали гигантский пузырь, который кипит на поверхности Бетельгейзе. Эти особенности помогают объяснить, как звезда проливает газ и пыль в космос на огромных скоростях.

В течение следующего миллиона лет Бетельгейзе, возможно, продолжит оставаться красным гигантом, но взрыв сверхновой не исключен. И, если завтра в обеденный перерыв вы обратите свой взор на небо и увидите светящееся облако размером с полную Луну, знайте, это Бетельгейзе, это ее финальный аккорд.


Electric cars should be recharged on the go, but how?

The global automotive industry is worth 2 trillion dollars, but electric and hybrid cars now account for less than 1% of this number. However, experts are predicting an explosion in relation to electric vehicles or simply electric vehicles. UBS predicts that the demand for electric vehicles will reach a turning point in 2018, as their cost will decline and eventually fall below the cost of conventional vehicles with internal combustion engine (including due to costs). China has seen a 53 percent increase in sales of electric vehicles from 2015 to 2016, and India is planning to sell only electric cars by 2030.

And even if they are available, even if they are not so much to pollute the air, electric cars will have one major limitation… they are electric. Electrician battery operated, the batteries and if the batteries are not recharged, they die.

Tesla Model 3 will be able to go 350 miles on a single charge, and the new Chevy Bolt — 400. This is the not so small distances, especially compared to the 50-mile range of mileage the Volt three years ago. Despite this, when the battery of the electric vehicle is running out, charging takes hours.

Researchers from Stanford University just made a step towards solving this problem. In an article published last week in Nature, the team described a new method of wireless power to the moving object within close range.

The wireless transmission of energy works by using magnetic resonance. The alternating magnetic field in the coil of the transmitter makes the electrons in the receiver coil to oscillate, with the best transmission efficiency occurs when both coils are tuned to the same frequency and a certain angle.

This hinders the transmission of electricity if the object is moving. To circumvent the need for continuous manual adjustment, a team from Stanford University has removed an RF source in the transmitter and replaced it with a voltage amplifier and a feedback resistor.

The system calibrates itself to the desired frequency for different distances. Using this system, scientists were able to wirelessly transmit milliwatts boost of power moving led light in meter from it. No manual configuration is required, and the transfer efficiency remained stable.

One milliwatt is, of course, not tens of kilowatts consumed by the electric vehicle. But now, when it became clear that the amplifier copes, the team is working on increasing the amount of electricity that can be transmitted using this system.

Disabling the amplifier can make a big difference — for this test, engineers used a General purpose amplifier with an efficiency of about 10%, but custom amplifiers can improve the efficiency to more than 90%.

It will be some time before electric vehicles will begin charging while driving on the highway, but that is the future I foresee energy experts.

“In theory, you can move on indefinitely, even without stopping to recharge,” says Shanhui Fan, Professor of electrical engineering and lead author of the study. “It is hoped that you will be able to charge your electric vehicle moving on the highway. Coil at the bottom of the vehicle to electricity from the coils connected to the power conduit in the roadway”.

The introduction of power lines in the road, by definition, will be a major infrastructure project, and there is no sense to produce it, while electric cars will not appear on every corner. When electric vehicles will represent at least 50% of vehicles on the roads or more. But if charging is easier, more drivers will switch to electricity.

Tesla has somewhat simplified the ownership of the electric car, investing heavily in its network of Supercharger. Currently, worldwide there is 861 station with charger Supercharger 5655 places, and they continue to build. Station free charging of the vehicle Tesla for half an hour.

The opening of roads for installation of power lines, which can charge the car while driving, it seems unnecessary because covered by other technology. But as electric vehicles become more popular, drivers will wait a maximum of a smooth experience which can and will include no need to stop to charge the vehicle.

Despite significant obstacles, charging of electric vehicles on the go from a team at Stanford University has an amazing potential. Last but not least it can find application in cellular phones and personal medical implants. Perhaps with its help, the robots will get rid of the wires.