Hydraulic hybrid drivetrains, in which energy is stored as hydraulic pressure to propel a vehicle, have been proposed for automobiles that make frequent starts and stops in their duty cycle.
Thermoelectric materials have long promised to outshine ordinary heat engines. Now, researchers have discovered that the key to success is nanoscale engineering.
The art of glider building, which began in carpenter shops and initially produced airframes, has advanced to a position on the cutting edge of aeronautical technology.