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In 1885, at the age of 21, Yai invented a continuous electric clock powered by wet-cell batteries. Electrically-powered clocks already existed, but they had conventional spring-powered clockwork movements , with electricity used to wind up the spring, while Yai's was a breakthrough, powered directly by a battery he had made. [ 2 ]
Alessandro Giuseppe Antonio Anastasio Volta (UK: / ˈ v ɒ l t ə /, US: / ˈ v oʊ l t ə /; Italian: [alesˈsandro ˈvɔlta]; 18 February 1745 – 5 March 1827) was an Italian chemist and physicist who was a pioneer of electricity and power, [1] [2] [3] and is credited as the inventor of the electric battery and the discoverer of methane.
Ovshinsky was born and grew up in the industrial town of Akron, Ohio, then at the center of the American rubber industry.The elder son of working-class Lithuanian Jewish immigrant parents who left Eastern Europe around 1905—Benjamin Ovshinsky from Lithuania and Bertha Munitz from what is now Belarus—Ovshinsky became active in social activities at an early age during the Great Depression. [7]
In 1842, Grove developed the first fuel cell (which he called the gas voltaic battery), which produced electrical energy by combining hydrogen and oxygen, and described it using his correlation theory. [3] In developing the cell and showing that steam could be disassociated into oxygen and hydrogen, and the process reversed, he was the first ...
In 1800, Volta invented the first true battery, storing and releasing a charge through a chemical reaction instead of physically, which came to be known as the voltaic pile. The voltaic pile consisted of pairs of copper and zinc discs piled on top of each other, separated by a layer of cloth or cardboard soaked in brine (i.e., the electrolyte ).
Illustration of Virchow's cell theory. Virchow is credited with several key discoveries. His most widely known scientific contribution is his cell theory, which built on the work of Theodor Schwann. He was one of the first to accept the work of Robert Remak, who showed that the origin of cells was the division of pre-existing cells. [29]
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Social factors in epidemiology were largely ignored until Doyal, Navarro, and others proposed the theories of SPD and Political Economy of Health in the 1970s, [4] and Krieger later integrated these theories into her writings on Ecosocial Theory (1994, 2011). As described by Doyal, SPD consists of the following key constructs: (1) The ...