Physicists detect nuclear decay in the recoil of a levitating sphere. In the work that won the Physics World award last year, the team used samples of radon-220, which decays first into polonium-216 ...

National Geographic stories take you on a journey that’s always enlightening, often surprising, and unfailingly fascinating.

Star names Comments by (from top to bottom) Anton Zeilinger, Alain Aspect, Serge Haroche and David Wineland in the Helgoland "gold book". (Courtesy: Matin Durrani) The first session at the Helgoland ...

This textbook deals with the requirements of space physics. The first part starts with a description of the Earth's plasma environment, followed by a derivation of single particle motions in ...

Nonlinear time series methods have developed rapidly over a quarter of a century and have reached an advanced state of maturity during the last decade. Implementations of these methods for ...

The detection limits of Ca 2+ and Eu 3+ are 5 × 10 −8 and 1.0 × 10 −15 M, respectively. Zeng et al. [ 15 ] have reported a fluorescence-based fiber with protein molecule sensor transducers. The ...

Local approximations to the exchange-correlation functional are of special interest because of their cost advantages and their useful accuracy for efficient calculations on systems (such as many ...