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An atomic clock is based on a system of atoms which may be in one of two possible energy states. A group of atoms in one state is prepared, then subjected to microwave radiation. If the radiation is of the correct frequency, a number of atoms will transition to the other energy state.
The CSAC, the world's smallest atomic clock, is 4 x 3.5 x 1 cm (1.5 x 1.4 x 0.4 inches) in size, weighs 35 grams, consumes only 115 mW of power, and can keep time to within 100 microseconds per day after several years of operation. A more stable design based on the vibration of rubidium atoms was demonstrated by NIST in 2019. [5]
Korea Research Institute of Standards and Science. Daejeon, South Korea. Caesium atomic clocks [25] Cs. National Metrology Centre. Queenstown, Singapore. Five caesium clocks, one passive hydrogen maser, two active hydrogen masers.
Atmos clock. Jaeger-LeCoultre's Atmos clock on display. Atmos is the brand name of a mechanical torsion pendulum clock manufactured by Jaeger-LeCoultre in Switzerland. The clock gets the energy it needs to run from temperature changes in the environment and does not need to be wound manually. It can run for years without human intervention.
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Hang in there, Baby is a popular catchphrase and motivational poster. There were several versions of the "Hang in There, Baby" poster, featuring a picture of a cat or kitten, hanging onto a stick, tree branch, pole or rope. The original poster featured a black and white photograph of a Siamese kitten clinging to a bamboo pole and was first ...
1890–1914. Art Nouveau posters and graphic arts flourished and became an important vehicle of the style, thanks to the new technologies of color lithography and color printing, which allowed the creation of and distribution of the style to a vast audience in Europe, the United States and beyond. Art was no longer confined to art galleries ...
Big-character posters (Chinese: 大字报; lit. 'big-character reports') are handwritten posters displaying large Chinese characters, usually mounted on walls in public spaces such as universities, factories, government departments, and sometimes directly on the streets. They were used as a means of protest, propaganda, and popular communication.
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