“通常情况下，除了超晶格活跃区域，量子级联激光器设计只有一个高能态，”论文第一作者藤田一惠（Kazuue Fujita）在电子邮件采访中告诉PhysOrg.com。

“Usually, quantum cascade laser designs have only one upper state, except for superlattice active region, ” Kazuue Fujita, the lead author on the paper, tells PhysOrg.com in an email interview.

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一个全新的超主权评级机构正在成形。该机构旨在降低对美国三大评级机构，即穆迪、标普、惠誉的依赖。

The establishment of a super-sovereign credit rating agency to reduce dependence on the "big three", or Moody's, Standard & Poor's and Fitch, is taking shape.

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袁惠群。李成英。周卓稀土超磁致伸缩材料应力与电磁耦合特性的实验研究。

Li C Y. Yuan H Q. Yang L S Measurements of the mechanical and electromagnetic properties of rare earth giant magnetostriction materials.

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