New Articles (Page 355)

To stay up to date you can also follow on Mastodon.

πŸ”— Wikipedia blocks T-Mobile's entire IPv6 /32 from editing

Discussed on

πŸ”— Communication with Submarines

πŸ”— Technology πŸ”— Military history πŸ”— Military history/Military science, technology, and theory πŸ”— Military history/Maritime warfare

Communication with submarines is a field within military communications that presents technical challenges and requires specialized technology. Because radio waves do not travel well through good electrical conductors like salt water, submerged submarines are cut off from radio communication with their command authorities at ordinary radio frequencies. Submarines can surface and raise an antenna above the sea level, then use ordinary radio transmissions, however this makes them vulnerable to detection by anti-submarine warfare forces. Early submarines during World War II mostly traveled on the surface because of their limited underwater speed and endurance; they dove mainly to evade immediate threats. During the Cold War, however, nuclear-powered submarines were developed that could stay submerged for months. Transmitting messages to these submarines is an active area of research. Very low frequency (VLF) radio waves can penetrate seawater a few hundred feet, and many navies use powerful VLF transmitters for submarine communications. A few nations have built transmitters which use extremely low frequency (ELF) radio waves, which can penetrate seawater to reach submarines at operating depths, but these require huge antennas. Other techniques that have been used include sonar and blue lasers.

Discussed on

πŸ”— George PΓ³lya: How to Solve It (1945)

πŸ”— Mathematics πŸ”— Books πŸ”— Systems

How to Solve It (1945) is a small volume by mathematician George PΓ³lya describing methods of problem solving.

Discussed on

πŸ”— Vasili Arkhipov – Soviet Navy Officer Who Prevented Nuclear Strike in 1962

πŸ”— Biography πŸ”— Soviet Union πŸ”— Russia πŸ”— Military history πŸ”— Military history/Military biography πŸ”— Biography/military biography πŸ”— Military history/Maritime warfare πŸ”— Military history/Cold War πŸ”— Cold War πŸ”— Russia/Russian, Soviet, and CIS military history πŸ”— Military history/Russian, Soviet and CIS military history πŸ”— Russia/history of Russia

Vasily Arkhipov (Russian: Василий Архипов) may refer to:

  • Vasily Arkhipov (vice admiral) (1926–1998), Soviet Navy officer credited with casting the single vote that prevented a Soviet nuclear strike
  • Vasily Arkhipov (general) (1906–1985), Commander of the 53rd Guards Tank Brigade of the Red Army during World War II, twice Hero of the Soviet Union


Discussed on

πŸ”— DNA origami

πŸ”— Biology πŸ”— Molecular and Cell Biology πŸ”— Genetics

DNA origami is the nanoscale folding of DNA to create non-arbitrary two- and three-dimensional shapes at the nanoscale. The specificity of the interactions between complementary base pairs make DNA a useful construction material, through design of its base sequences. DNA is a well-understood material that is suitable for creating scaffolds that hold other molecules in place or to create structures all on its own.

DNA origami was the cover story of Nature on March 16, 2006. Since then, DNA origami has progressed past an art form and has found a number of applications from drug delivery systems to uses as circuitry in plasmonic devices; however, most applications remain in a concept or testing phase.

Discussed on

πŸ”— List of virtual communities with more than 1 million users

πŸ”— Internet culture πŸ”— Telecommunications πŸ”— Websites πŸ”— Websites/Computing

This is a list of notable active virtual communities with more than 1 million registered members.

Defunct

Discussed on

πŸ”— 1961 Goldsboro B-52 crash

πŸ”— United States πŸ”— United States/North Carolina πŸ”— Aviation πŸ”— Military history πŸ”— Disaster management πŸ”— Military history/Military aviation πŸ”— Military history/North American military history πŸ”— Military history/United States military history πŸ”— United States/Military history - U.S. military history πŸ”— Aviation/Aviation accident πŸ”— Military history/Military science, technology, and theory πŸ”— Military history/Weaponry

The 1961 Goldsboro B-52 crash was an accident that occurred near Goldsboro, North Carolina, on 23 January 1961. A Boeing B-52 Stratofortress carrying two 3–4-megaton Mark 39 nuclear bombs broke up in mid-air, dropping its nuclear payload in the process. The pilot in command, Walter Scott Tulloch, ordered the crew to eject at 9,000 feet (2,700Β m). Five crewmen successfully ejected or bailed out of the aircraft and landed safely, another ejected, but did not survive the landing, and two died in the crash. Information declassified in 2013 showed that one of the bombs came very close to detonating.

Discussed on

πŸ”— Strowger Telephone Switch (1891)

πŸ”— Telecommunications

The Strowger switch is the first commercially successful electromechanical stepping switch telephone exchange system. It was developed by the Strowger Automatic Telephone Exchange Company founded in 1891 by Almon Brown Strowger. Because of its operational characteristics it is also known as a step-by-step (SXS) switch.

Discussed on

πŸ”— List of spacecraft in the Culture series

Discussed on

πŸ”— Atari Transputer Workstation

πŸ”— Video games πŸ”— Computing

"ABAQ" redirects here. ABAQ is also the callsign for TV station ABQ in Alpha, Queensland.

The Atari Transputer Workstation (also known as ATW-800, or simply ATW) is a workstation class computer released by Atari Corporation in the late 1980s, based on the INMOS transputer. It was introduced in 1987 as the Abaq, but the name was changed before sales began. Sales were almost non-existent, and the product was canceled after only a few hundred units had been produced.

Discussed on