排序方式: 共有43条查询结果,搜索用时 15 毫秒
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介绍了DPA—Switch芯片的外部引脚、内部电路及功能模块;讲解了同步整流电路的基本工作原理。根据DPA—Switch的特性给出了同步整流开关电源的设计方法和具体的设计电路,并对外围电路的设计进行了分析,最后给出了测试结果及设计注意事项。 相似文献
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对目标单位是市和区县级工商行政管理局或分局的工商行政管理信息系统的特点及功能给予介绍。该系统友好的用户界面、丰富强大的功能,安全、快捷、方便的操作,受到了用户的好评。 相似文献
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In order to investigate the yielding behavior of the newly developed Ni 3 Al-based intermetallic alloy IC10, yield stresses have been measured in tension and compression with different orientations. The specimens were cut from a sheet with different angles inclined from the solidification direction. The inclined angles were taken to be 0 , 22.5 , 45 , 67.5 and 90 . All experiments were conducted at room temperature except for orientation 0 , whose deformation temperatures ranged from 298 to 1273 K. Experimental results show that the yield strength of alloy IC10 has the anomalous behavior which has been observed for other Ll 2 -long-range ordered intermetallic alloys, but it is less pronounced. The abnormalities show the following characteristics: (i) the yield strength increases as the temperature is raised below the peak temperature, (ii) yield strength anisotropy, (iii) tension/compression asymmetry. Compared to Ni 3 Al single crystals, the polycrystalline exhibits some different yielding behaviors which may be due to the high volume fraction of c phase. 相似文献
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《中国航空学报》2021,34(1):438-448
Ni3Al-based superalloy IC10 is widely used in high temperature components of aero-engines because of its superior mechanical properties. In this paper, the creep feed grinding properties of IC10 were investigated experimentally. The effects of grinding parameters on the grinding forces and temperature were examined. Moreover, the influences of surface roughness and hardening on the high-cycle fatigue life of IC10 specimens were studied. To control the creep feed grinding parameters and enhance the fatigue life of IC10 components, the experimental results were summarized to offer a useful reference point. It is concluded that, the grinding depth is the most important factor which influencing the grinding forces and temperature; the surface roughness is the main and unfavorable factor on the fatigue life of IC10, while the surface hardening has a positive influence on the fatigue life; to obtain a better surface quality and improve the fatigue life of IC 10, the recommended grinding parameter domain involves wheel speed ∈ [15, 20] m/s, feed rate ∈ [150, 200] mm/min, and grinding depth ∈ [0.4, 0.5] mm. 相似文献
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为了研究IC10合金的动态再结晶特性,利用MTS809材料测试系统对其在900°C、不同应变率(10-4~10-2s-1)下进行了拉伸试验。试验结果表明:(1)不同应变率下的应力-应变曲线具有类似的特征,并且IC10合金的流变应力对应变率敏感;(2)流变应力、临界应力和临界应变随着应变率的增加而增大。基于TEM和SEM试验IC10合金的力学特性机理。为了描述IC10合金的动态再结晶行为,本文提出了一个新的宏观唯象本构模型。该模型的预测与试验结果比较验证了其有效性。 相似文献
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数字IC的检测方法与技术 总被引:1,自引:0,他引:1
数字电路的各种仪器设备中,数字IC的应用较广.那么,如何正确检测数字片的性能,判断故障所在,文中提出了静态检测、逻辑功能检测、逻辑比较等几种常用的方法. 相似文献
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介绍了集成电路测试系统中程控直流电源的结构、工作原理,分析了影响程控直流电源准确校准的因素,提出采用开尔文连接校准程控直流电源的方法。根据该原理对ASL3000集成电路测试系统进行了校准实验,通过对测量结果的不确定度进行分析,证实了测量结果的准确性和可靠性。 相似文献
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任琪 《长沙航空职业技术学院学报》2003,3(2):43-46
大屏幕彩色电视机中均采用了I^2C总线控制,使复杂的输入/输出接口电路变得简单化,提高了单元电路的使用寿命,降低了故障率和维修成本,但有时因元件老化等原因会导致总线参数变化,引起电视机某些功能失常。为此,本篇介绍了大屏幕彩色电视机中I^2C总线的常见调整及故障检修方法。 相似文献
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施敏 《航空精密制造技术》1993,(1)
金属氧化物半导体场效应晶体管(MOSFET)是用于ULSI中的重要器件。现在,我们评述从MOSFET的起始,直到在ULSI中应用时期的主要里程碑,并且讨论MOSFET功能的未来趋势。 相似文献