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Subway operators introduced linear metros in 1990s and continued successful urban passenger transport service in many large and dense cities in Japan for more than a quarter century. A significant disadvantage of the linear metros is the relatively low energy efficiency. Therefore, Japan Subway Association (JSA) started a technical challenge to reduce the traction energy consumption of linear metros...
To investigate the elastic properties of solid 4He at low temperatures, the shear modulus of solid 4He confined in a narrow gap, comparable to the length of the dislocation network of solid 4He was measured. Two sets of parallel plate transducers were prepared. One set has a narrow gap of 11μm and the other has a 290μm gap as a reference of the bulk solid measurement. The temperature and strain dependences...
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