Oleg Zabluda's blog
Saturday, August 25, 2018
 
https://ai.googleblog.com/2018/05/the-question-of-quantum-supremacy.html?m=1
https://ai.googleblog.com/2018/05/the-question-of-quantum-supremacy.html?m=1

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- posted by Oleg Zabluda @ 7:41 PM | permalink | | | technorati | bloglines | feedster
 
Photos: 50 Years Since a Soviet Invasion Ended the Prague Spring
Photos: 50 Years Since a Soviet Invasion Ended the Prague Spring
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In 1968, during a period called the “Prague Spring,” Alexander Dubček, the newly elected leader of Czechoslovakia, enacted pro-democracy reforms that loosened state control and expanded individual rights, giving hope to citizens and angering the Soviet Union. Soviet leaders in Moscow believed that Czechoslovakia, a member of the Warsaw Pact, had gone too far, and summoned the country’s leaders for discussions. By late summer, the talks were not going the way the Kremlin had wanted, so more than 2,000 tanks and thousands more Warsaw Pact troops were sent to invade and occupy the country on August 21. In the first weeks, occupying soldiers were met with protests and limited resistance, and more than 70 civilians were killed in the conflicts. Within the following year, resistance faded, Dubček was removed from office, his reforms were undone, and a more Soviet-controlled government was installed.
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https://www.theatlantic.com/photo/2018/08/photos-50-years-since-a-soviet-invasion-ended-the-prague-spring/567916/
https://www.theatlantic.com/photo/2018/08/photos-50-years-since-a-soviet-invasion-ended-the-prague-spring/567916/

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- posted by Oleg Zabluda @ 12:34 PM | permalink | | | technorati | bloglines | feedster
 
Units from ten NATO countries in military parade on Ukraine’s 27th Independence Day
Units from ten NATO countries in military parade on Ukraine’s 27th Independence Day
http://euromaidanpress.com/2018/08/24/units-from-ten-nato-countries-march-in-military-parade-on-ukraines-27th-independence-day/
http://euromaidanpress.com/2018/08/24/units-from-ten-nato-countries-march-in-military-parade-on-ukraines-27th-independence-day/

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- posted by Oleg Zabluda @ 11:57 AM | permalink | | | technorati | bloglines | feedster
 
Wireless communication breaks through water-air barrier
Wireless communication breaks through water-air barrier
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when the transmitter wants to send a 0, it can transmit a wave traveling at 100 hertz; for a 1, it can transmit a 200-hertz wave. When the signal hits the surface, it causes tiny ripples in the water, only a few micrometers in height, corresponding to those frequencies.

To achieve high data rates, the system transmits multiple frequencies at the same time, building on a modulation scheme used in wireless communication, called orthogonal frequency-division multiplexing. This lets the researchers transmit hundreds of bits at once.

Positioned in the air above the transmitter is a new type of extremely-high-frequency radar that processes signals in the millimeter wave spectrum of wireless transmission, between 30 and 300 gigahertz. (That’s the band where the upcoming high-frequency 5G wireless network will operate.)

The radar, which looks like a pair of cones, transmits a radio signal that reflects off the vibrating surface and rebounds back to the radar. Due to the way the signal collides with the surface vibrations, the signal returns with a slightly modulated angle that corresponds exactly to the data bit sent by the sonar signal. A vibration on the water surface representing a 0 bit, for instance, will cause the reflected signal’s angle to vibrate at 100 hertz.
[...]
A key challenge was helping the radar detect the water surface. [...] The next major challenge was capturing micrometer waves surrounded by much larger, natural waves. [...] Natural waves occur at about 1 or 2 hertz [...] The sonar vibrations of 100 to 200 hertz, [...].
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https://news.mit.edu/2018/wireless-communication-through-water-air-0822
https://news.mit.edu/2018/wireless-communication-through-water-air-0822

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- posted by Oleg Zabluda @ 11:33 AM | permalink | | | technorati | bloglines | feedster
 
Alcohol use and burden for 195 countries and territories, 1990–2016: a systematic analysis for the Global Burden of...
Alcohol use and burden for 195 countries and territories, 1990–2016: a systematic analysis for the Global Burden of Disease Study 2016
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improved estimates of alcohol use and alcohol-attributable deaths and disability-adjusted life-years (DALYs) for 195 locations from 1990 to 2016, for both sexes and for 5-year age groups between the ages of 15 years and 95 years and older.

Methods

Using 694 data sources of individual and population-level alcohol consumption, along with 592 prospective and retrospective studies on the risk of alcohol use, we produced estimates of the prevalence of current drinking, abstention, the distribution of alcohol consumption among current drinkers in standard drinks daily (defined as 10 g of pure ethyl alcohol), and alcohol-attributable deaths and DALYs.
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https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(18)31310-2/fulltext

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- posted by Oleg Zabluda @ 10:52 AM | permalink | | | technorati | bloglines | feedster

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