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Techno. & Science


  • Scientists Are Developing A Battery That Charges In Seconds And Lasts For A Week

     

    Over the last decade, smartphones have got better in almost every conceivable way. But while consumers have seen vast improvements in screen resolution, processing power and camera quality, battery development has stalled.

    Now a team of American scientists think nanotechnology holds the key to a revolution in energy storage, and they’ve found a way to prove it.

    study published in ACS Nano has revealed a new process for creating flexible super-capacitors which take seconds to charge, provide power for more than a week and can be recharged more than 30,000 times. A conventional lithium-ion battery yields just 1,500 charges. 

    “For small electronic devices, our materials are surpassing the conventional ones worldwide in terms of energy density, power density and cyclic stability,” said Nitin Choudhary, a post doctoral associate at the University of Central Florida (UCF).

    The super-capacitors are comprised of millions of nanometer-think wires coated with shells of two-dimensional materials. The core facilitates rapid electron transfer for charing and discharging, while the shells pack in huge amounts of energy into a minuscule space.

    “There have been problems in the way people incorporate these two-dimensional materials into the existing systems ― that’s been a bottleneck in the field. We developed a simple chemical synthesis approach so we can very nicely integrate the existing materials with the two-dimensional materials,” said lead investigator Yeonwoong “Eric” Jung, an assistant professor at UCF.

    Jung said the super-capacitors aren’t yet ready for commercialisation, but that they could soon be used to enhance or replace batteries in a range of electronic gadgets, and even electric vehicles.

    “This is a proof-of-concept demonstration, and our studies show there are very high impacts for many technologies.”

    Source: -huffingtonpost.co.uk

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  • Top 10 Countries With Highest 4G LTE Speed In The World

     

    Short Bytes: The 4G technology based on the LTE standard has reached most parts of the world. OpenSignal has released the State of LTE report for November 2016. Singapore tops the charts of the top 10 countries with the highest average 4G LTE speed.

    The State of LTE report for November 2016 has been published by OpenSignal. The report gives us a detailed idea about the 4G LTE’s worldwide reach.

    LTE – a standard for high-bandwidth wireless communication on mobile devices – is considered as a commercially deployed form of the 4th generation wireless mobile communications technology. However, it doesn’t enable even half of the peak data speed – 1Gbit/s for stationary users and 100 Mbit/s for mobile users – technically specified for the 4G technology.

    4G and LTE (Long Term Evolution) are two different terms which are jointly used by various companies to promote their LTE networks.

    A newer standard, LTE Advanced (LTE-A), has been brought into existence because the first release version of LTE does not fulfill the IMT-Advanced Specifications set forth by the ITU Radiocommunication Sector (ITU-R).

    Top 10 Countries With Highest 4G LTE Speed In The World

     Country 4G LTE Speed
    Singapore 45.86 Mbps
    South Korea 45.77 Mbps
    Hungary 40.61 Mbps
    Romania 35.61 Mbps
    New Zealand 34.94 Mbps
    Bulgaria 34.26 Mbps
    Netherlands 33.84 Mbps
    Australia 32.50 Mbps
    Luxembourg 31.70 Mbps
    Iceland 31.39 Mbps

    Singapore tops the chart with highest 4G Speed and outperforms South Korea by a thin margin. However, South Korea’s 4G network is better in terms of 4G availability. A mobile user in South Korea has a success rate of 95.7% that he/she would be able to connect to a 4G network.

    The State of LTE report also tells about the LTE speeds at the world level. The global 4G LTE speeds average out at 17.4 Mbps.

    Having a greater number in terms of 4G speed is not the only thing required to create a good and reliable 4G LTE ecosystem. There are several countries which are up in the LTE speed chart but don’t perform well in terms of availability.

    It’s good to see that LTE speeds are about to cross the 50 Mbps mark. Hopefully, the LTE Advanced will push it closer to the Gigabit speed mark.

    Here are the world map illustrations for 4G LTE speed and availability for different countries.

     

    You can see, countries like India, where the 4G LTE availability is as high as 71%, lag behind considerably when we talk about speed. For India, the 4G LTE speed is just 6.39 Mbps. Similar is the case of the US – the early adopters of the LTE technology. Even though the US has better numbers than India, the 4G availability for the US is 81.3% while the average speed is 13.95 Mbps. The reverse is also true in the case of some countries, like Denmark, having high speed but less availability of 4G LTE.

    Source: -fossbytes.com

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