U.S. flag

美国政府的官方网站

Dot gov

Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS

A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites..

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Period of Performance (POP)

The total amount of time (sometimes several years) during which the federal agency authorizes a grantee to complete the approved work of the project described in the application. Performance periods of more than 1 year are divided into budget periods.