ISSN:0031-9228    

DOI:10.1063/1.2337795

出版商:AIP    

年代:1906

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2337801

出版商:AIP    

年代:1906

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2337805

出版商:AIP    

年代:1906

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2337809

出版商:AIP    

年代:1906

数据来源: AIP

摘要:

The up‐or‐down spinof an electron makes it a natural qubit candidate for use, someday, in a quantum computer. Circuit logic based on the flipping of spins would require less energy and suffer far less heat dissipation than that based on the switching of charge. The challenge is to prepare the spins, flip them on cue, and then reliably read out their final states within a system—all while minimizing decoherence (see PHYSICSTODAY, March 2006, page 16).

ISSN:0031-9228    

DOI:10.1063/1.2337810

出版商:AIP    

年代:1906

数据来源: AIP

摘要:

In November 1962, Robert Hall and his team from General Electric reported an infrared‐emitting diode made from gallium arsenide. One month later, Nick Holonyak and Sam Bevacqua, also of GE, reported a red light‐emitting diode made from GaAs alloyed with phosphorus. And so began the quest to widen the application of LEDs by shortening their wavelengths.

ISSN:0031-9228    

DOI:10.1063/1.2337811

出版商:AIP    

年代:1906

数据来源: AIP

摘要:

Electric chargesare everywhere, but there is still no evidence of magnetic monopoles. That remains true even after a new report of the most sensitive search to date for monopole production at accelerator energies. The report, by the CDF‐detector collaboration at the Fermilab Tevatron collider, concludes that more than1012proton‐antiproton collisions over several months in the world's highest‐energy collider produced not even one pair of magnetic monopoles.

ISSN:0031-9228    

DOI:10.1063/1.2337812

出版商:AIP    

年代:1906

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2337813

出版商:AIP    

年代:1906

数据来源: AIP

摘要:

Is it “stingy” and “unfair”of the US not to contribute to the operating costs of the Large Hadron Collider? Robert Aymar, director general of CERN, the LHC's host laboratory in Geneva, Switzerland, has been quoted saying so in French and Swiss newspapers in recent months. Among US policymakers and scientists, the allegations are not meeting with much sympathy, but they are causing concern that the public airing could be harmful to science.

ISSN:0031-9228    

DOI:10.1063/1.2337817

出版商:AIP    

年代:1906

数据来源: AIP

摘要:

After more than a yearof controversy surrounding proposed changes to the Department of Commerce's “deemed export” policy, government officials are stepping back from the recommendations and establishing an independent advisory committee made up of researchers and others from the academic and industrial communities to review the policy. The recommendations to alter the deemed export policy were made by DOC's inspector general in 2004 in an effort to tighten up rules that are intended to keep researchers from restricted countries who are working in the US from taking knowledge about controlled technology back to their home countries (see PHYSICSTODAY, October 2005, page 28).

ISSN:0031-9228    

DOI:10.1063/1.2337818

出版商:AIP    

年代:1906

数据来源: AIP