The US is officially extending the deployment of an aircraft carrier in the Middle East. The Pentagon is also directing a second carrier to the region while another moves into the Pacific.

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These are the approximate positions of the U.S. Navy’s deployed carrier strike groups and amphibious ready groups throughout the world… ...

A simulation on the origin and evolution of the North Atlantic Oscillation (NAO) has been conducted by a PKU research team led by Nie Ji, Associate Professor of the School of Physics; and Hu ...

Abstract: Equations are presented which fit the experimental dependence of carrier mobilities on doping density and field strength in silicon. The curve-fitting procedures are described.