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The International Space Station is a unique multi-faceted orbiting laboratory supporting research, development, test and evaluation of new innovative space and Earth-based applications. While NASA sponsored investigations on the ISS are focused largely on enabling future long duration human space exploration missions, Congress designated the US portion of the space station as a National Laboratory making its facilities available to other Federal agencies and private entities for non-exploration related ventures. RDT&E activities on the ISS encompass a number of technical areas including environmental control and life support, communications, materials science, guidance, navigation and control, propulsion, electrical power, and thermal control systems.  相似文献   
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