Microstories - small, but interesting stuff

Discussion in 'Science & Technology' started by Sven, Oct 10, 2015.

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  1. BlueHawk

    BlueHawk Captain

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    @YarS My first thinking was. Look like it is easy to blow up. :D
     
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  2. YarS

    YarS Lieutenant Colonel

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  3. YarS

    YarS Lieutenant Colonel

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    https://arxiv.org/abs/1705.09258
    Quantum-secured blockchain
    E.O. Kiktenko, N.O. Pozhar, M.N. Anufriev, A.S. Trushechkin, R.R. Yunusov, Y.V. Kurochkin, A.I. Lvovsky, A.K. Fedorov
    (Submitted on 25 May 2017)
    Blockchain is a distributed database which is cryptographically protected against malicious modifications. While promising for a wide range of applications, current blockchain platforms rely on digital signatures, which are vulnerable to attacks by means of quantum computers. The same, albeit to a lesser extent, applies to cryptographic hash functions that are used in preparing new blocks, so parties with access to quantum computation would have unfair advantage in procuring mining rewards. Here we propose a possible solution to the quantum-era blockchain challenge and report an experimental realization of a quantum-safe blockchain platform that utilizes quantum key distribution across an urban fiber network for information-theoretically secure authentication. These results address important questions about realizability and scalability of quantum-safe blockchains for commercial and governmental applications.
     
  4. YarS

    YarS Lieutenant Colonel

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    http://www.cnbc.com/2017/05/29/russia-shocks-airline-industry-with-maiden-flight-of-new-plane.html

    Russia shocks airline industry with maiden flight of new passenger plane
    David Reid | @cnbcdavy
    Mon, 29 May '17 | 2:29 AM ETCNBC.com



    Russia has surprised the airline industry by announcing the successful test flight of a new medium range passenger plane.

    Irkut Corporation, itself owned by state controlled United Aircraft Corporation, said its MC-21-300 had successfully flown for 30 minutes at a height of 1000metres at a speed of 300 kilometers per hour.

    "[The] flight mission is accomplished. The flight went in the normal mode. There are no obstacles revealed preventing the tests continuation," the lead test pilot, Oleg Kononenko, is quoted as saying on the Irkut Corp. website, Sunday.

    With a capacity between 163 and 211 passengers and a maximum flight range of 6,000 kilometers, the MC-21-300, will attempt to compete with the Boeing 737 and Airbus A320.

    Irkut said global demand for that area of aviation should translate to about 15,000 new aircraft worldwide across the next 20 years.

    [​IMG]
    Photographer | Collection | Getty Images
    The firm claimed the new plane is superior to existing rivals, highlighting its extensive use of polymer composite materials.

    The plane maker also lauded the new generation engines which it said reduced fuel consumption, emitted lower noise and pumped out less hazardous emissions.

    "[The] calculated reduction of direct operational costs for MC-21 is 12-15% lower than for counterparts," the statement added.

    The program cost of the plane was estimated by Russian state media at 164 billion rubles ($4.6 billion) in 2014, but delivery dates have slipped since then.

    Irkut said it has an initial portfolio of 175 "firm orders" which will maintain production capacity "in the coming years".
     
  5. YarS

    YarS Lieutenant Colonel

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    Another step to real neurocomputers.
    http://www.sciencedirect.com/science/article/pii/S0167577X17308273

    Bipolar effect of resistive switchings (BERS) in epitaxial film-based heterostructures Nd2−xCexCuO4−y and YBa2Cu3O7−y is investigated in the paper using the fundamental properties of the HTSC parent compounds – antiferromagnetic Mott insulators, which exhibiting a transition between a metal and an insulator owing to oxygen doping. The studies of electronic structure of the NCCO and YBCO epitaxial films surfaces by XPS and AFM have shown that the surface layer (∼30 nm) doped with oxygen is changing from metal (in a film bulk) to insulate state on the surface. The current-voltage characteristics of BERS devices obey a diode-like model upon the approach based on the double-diode equation.
     
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