In the five years after the invention of the laser in 1960 , tabletop lasers advanced in a series of technological leaps to reach a power of one gigawatt ( 109 w ) 1960年雷射发明后的五年间，桌上型雷射的发展经由一系列的科技跃迁，已进展到10亿瓦功率的地步。
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The power measurement of high power microwave ( hpm ) is imprecise because of its features of short pulse duration ( 10 ’ s nanosecond ) , high power level ( the order of gigawatt ) and so on 高功率微波因微波脉宽时间短(几十个纳秒) 、功率高(吉瓦级)等特点,造成了其功率测量上的不精确。
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With the implementation of the mandatory scheme for these three products , an electricity saving of 150 gigawatt hours per year and an annual reduction of carbon dioxide emission of 105 , 000 tonnes will be achieved 三类指定产品推行强制性标签计划后，每年可多节省一亿五千万度电，同时减少排放十万五千公吨二氧化碳。
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At the same time , in order to increase the gain of the radiation aperture , a new way to enlarge the waveguide radius is presented . and a gigawatt level of averaged output power with quasi - single tmoi mode is obtained at 3 . 9ghz under the diode voltage of 550kv and the beam current of 23ka 同时，为增大辐射口增益，提出了一种增大波导管半径的方法，并且在二极管电压为550kv 、束流为23ka的条件下，模拟获得了平均功率达gw量级，频率为3 . 9ghz的准tm _ ( 01 )模式的微波输出。
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Ten years after the discovery of high - temperature superconductivity , a technical study by the electric power research institute ( epri ) concluded that with liquid nitrogen as a coolant , a five - gigawatt dc “ electricity pipe ” could compete economically with a gas pipeline or conventional overhead lines for transmission distances of 800 kilometers or more 发现高温超导特性的10年之后，美国电力研究所（ epri ）一份技术研究报告指出，以液态氮当做冷却剂时， 50亿瓦特的直流电管传输800公里以上的成本，跟瓦斯管线或传统架空电缆差不多。
