Wikipedia:Main Page history/2014 January 10

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From today's featured article

Waveguide post filter with tuning screws

A waveguide filter is an electronic filter that is constructed in waveguide technology. Waveguides are hollow metal tubes inside which an electromagnetic wave may be transmitted. Filters are a basic component of electronic engineering designs and have numerous applications. Waveguide filters are most useful in the microwave band of frequencies, where they are a convenient size and have low loss. Examples are found in satellite communications, telephone networks, and television broadcasting. Waveguide filters were developed during World War II for radar and electronic countermeasures, but afterwards soon found civilian applications. Post-war development was concerned with reducing size, first with new analysis techniques that eliminated unnecessary components, then by innovations such as dual-mode cavities and ceramic resonators. Waveguides can support a variety of electromagnetic wave modes: both a disadvantage, spurious modes frequently cause problems, and an advantage; dual-mode designs can be much smaller. The chief advantages of waveguide filters are ability to handle high power and low loss. The chief disadvantages are bulk and cost compared to technologies like microstrip. (Full article...)

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Did you know...

From Wikipedia's new and recently improved content:

... that physician and relief worker Ruth A. Parmelee (pictured) reported during the Armenian genocide that thousands of people "drop dead from hunger, thirst, and fatigue"?
... that the winner of two-player dueling indie game Nidhogg is eaten by the mythological Norse serpent Níðhöggr?
... that Stephen Rubin turned the Liverpool Shoe Company into Pentland Group, the UK's largest sports apparel company and owner of Berghaus, Mitre, Speedo and several other brands?
... that the African Children's Choir appears on Steven Curtis Chapman's 2012 Christmas album Joy?
... that after his defeat by the Scots in 1384, Ralph de Greystoke was taken to Dunbar Castle and ransomed for 3,000 marks?
... that the Elias Kumler House was restored after being condemned as a structural hazard?
... that Benjamin Clementine was discovered by a record company agent while busking on the Paris Metro?

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In the news

The United States Senate confirms Janet Yellen (pictured) as the Federal Reserve System's first female chair.
Archeologists identify the tomb of Egyptian pharaoh Sobekhotep I.
North America experiences record low temperatures.
Amid violence and a boycott by opposition parties, the Bangladesh Awami League wins the general election.
The al-Qaeda-affiliated Islamic State of Iraq and the Levant captures the city of Fallujah.
Latvia becomes the 18th EU member state to adopt the euro.
More than 100 people are killed when anti-government forces attack key buildings in Kinshasa, Democratic Republic of the Congo.

Recent deaths: Run Run Shaw – Eusébio – Phil Everly

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On this day...

January 10

9 – The Western Han Dynasty of China ended after the throne was usurped by Wang Mang (pictured), who founded the Xin Dynasty.
236 – Pope Fabian, who is said to have been chosen by the Holy Spirit by having a dove land on his head, began his papacy.
1863 – Service began on the Metropolitan Railway between Paddington and Farringdon Street, today the oldest segment of the London Underground.
1929 – The Adventures of Tintin, a series of popular comic books created by Belgian artist Hergé, first appeared in a children's supplement to the Belgian newspaper Le Vingtième Siècle.
1954 – BOAC Flight 781 suffered an explosive decompression at altitude and crashed into the Mediterranean Sea, killing everyone on board.

More anniversaries: January 9 – January 10 – January 11

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It is now January 10, 2014 (UTC) – Reload this page

Today's featured picture

The Eastern Phoebe (Sayornis phoebe) is a small, migratory passerine bird found in Central and North America. It breeds in woodlands in the eastern United States and often nests on human structures. This specimen was photographed in Madison, Wisconsin, US.

Photo: John Benson

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