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基于浮地源的功率器件测试能力提升方法
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作者 吕乐 庞明奇 罗晶 《电子测试》 2021年第9期48-49,52,共3页
提出一种基于浮地源的功率器件测试能力提升方法。该方法利用浮地源特点,通过合理的硬件设计,将测试能力提升一倍,解决了由于技术封锁导致设备板卡无法升级的问题。该方法可应用于电源管理类、电源模块类以及电压调整器类等模拟集成电... 提出一种基于浮地源的功率器件测试能力提升方法。该方法利用浮地源特点,通过合理的硬件设计,将测试能力提升一倍,解决了由于技术封锁导致设备板卡无法升级的问题。该方法可应用于电源管理类、电源模块类以及电压调整器类等模拟集成电路中的功率器件测试。 展开更多
关键词 浮地源 功率器件 集成电路测试
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The Four Stages in the Origin of Rice Agriculture
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作者 Zhao Zhijun 《Chinese Annals of History of Science and Technology》 2019年第1期1-20,共20页
In recent years,due to the widespread application of flotation,a large number of plant remains related to the origin of rice agriculture have been found in the middle and lower reaches of the Yangtze River.Through the... In recent years,due to the widespread application of flotation,a large number of plant remains related to the origin of rice agriculture have been found in the middle and lower reaches of the Yangtze River.Through the study of these new findings,it has been discovered that the origin of rice agriculture was a long and gradual process lasting for thousands of years.This process can be divided into four stages:the stage of gestation took place around 10,000 years ago—human society was still in the hunting and gathering phase,but archaeological evidence of human-used or even cultivated Oryza plants from that time has been discovered;the early stage of transition took place around 9000–7000 years ago—archaeological evidence of rice farming from that time has been found,such as villages,domesticated rice,farming tools,etc.,but subsistence then was still mainly based on hunting and gathering,whereas rice farming and pig breeding,which fall into the agricultural production category,were only auxiliary production activities;the late stage of transition took place around 7000–5000 years ago,when the proportion of subsistence attained by hunting and gathering gradually declined while the proportion of rice farming increased day by day;and the stage of completion took place about 5000 years ago,when hunting and gathering was replaced by rice agriculture in the middle and lower reaches of the Yangtze River successively. 展开更多
关键词 rice agriculture middle and lower reaches of the Yangtze River ORIGINATION flotation results
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