The Doppler effect has well-established applications in astronomy, medicine, radar and metrology. Recently, a number of experimental demonstrations of the inverse Doppler effect have begun to appear. However, the inverse Doppler effect has never been observed on an electronically reconfigurable system with an external electromagnetic wave source at radio frequencies (RF) in experiment. Here we ...

OBJECTIVE To detect, quantify, and compare the medication error produced with manual versus electronically assisted prescription systems. METHODS A descriptive, observational, prospective study in two traumatology hospitalisation units; one with manual prescriptions and the other with electronically assisted prescriptions. Prescription errors were determined. RESULTS We analysed 1,536 lines...

The binding of an excess electron to HBO and BOH was studied at the coupled cluster level of theory with single, double and non-iterative triple excitations and with extended basis sets to accommodate the loosely bound excess electron. The bent BOH molecule, with a dipole moment of 2.803D, binds an electron by 39 cm , whereas the linear HBO tautomer possesses a similar dipole moment (2.796D) ye...

We present a new concept for an electronically tunable diode laser. It is based on an external-cavity configuration with simultaneous feedback and intracavity spatial separation of the laser's spectral components. The electronical tunability is achieved by insertion of a liquid-crystal array as an electronically controlled aperture into the region of spatial separation of the spectral component...

Yaroslav Urzhumov,1,* Jae Seung Lee,2 Talmage Tyler,1 Sulochana Dhar,1 Vinh Nguyen,1 Nan M. Jokerst,1 Paul Schmalenberg,2 and David R. Smith1 1Center for Metamaterials and Integrated Plasmonics, Duke University, Durham, North Carolina 27708, USA 2Toyota Research Institute of North America, Ann Arbor, Michigan 48105, USA (Received 13 April 2012; revised manuscript received 6 July 2012; published...

Many engineering systems create unwanted noise that can be reduced by the careful application of engineering noise controls. When this noise travels down tubes and pipes, a tuned resonator can be used to muffle noise escaping from the tube. The classical examples are automobile exhaust and ventilation system noise. In these cases where a narrow frequency band of noise exists, a traditional engi...