- 拼写相近单词
- PECH
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In PEC trimers, the energy transfer paths in PEC monomers remain, but the transfer rates between the chromophores become higher due to strong couplings between pairs of the nearest neighbor chromophores 1α〓-PVB/2β〓-PCB. Meanwhile, a new energy transfer path with a time constant of about 40 ps emerges among the three β〓-PCB chromophores of C〓 symmetry in PEC trimers.
在PEC三聚体中,在相同单体中的能量传递途径仍存在,由于三聚体毗邻的1α〓-PVB/2β〓-PCB色团对之间的强耦合,使不同色素之间的能量传递速度加快;同时,在PEC三聚体中出现新的能量传递途径:3个具有C〓空间对称性的β〓-PCB之间所发生的较快速的能量传递(约40 ps)。
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Finally, the PEC-treated LEDs are packeted as the TO-Can and Lamp formal to measure the output power. The fabricated LEDs through the PEC process have 14.6% output power enhanced compared with the general LED at 20 mA operation current.
最后将基板磨薄切割劈裂成晶粒,并且以 TO-Can 与 Lamp 形式封装,量测电性资料与光学特性,发现表面结构的改变也影响发散角度,经过处理的晶粒有较大的发散角度,最终封装成 Lamp 形式的光输出功率增加14.6%。
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Based on the principle of PEC, surface cracks mainly affect the high frequency components and subsurface crack mainly affect the low frequency components, so the PEC signals can be analyzed in frequency domain, which can eliminate the influence of noises during measurement. A method of frequency spectrum separating point is proposed for flaw classification, which enhances the accuracy in classification of defects. The agreement between theory and experiment shows that the present method is valid and applicable.
通过对脉冲涡流的理论分析发现,表面裂纹主要影响脉冲频谱中的高频成分,而表面下裂纹主要影响脉冲频谱中的低频成分,因此可以将时域中易受噪声影响的脉冲涡流信号变换到频域分析,提出了"频谱分离点"的方法来对裂纹进行分类识别,提高了缺陷分类识别的正确率,理论分析和实验结果相一致,证明了该方法的正确性和有效性。
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PEC:氯化聚乙烯
聚合物片材薄膜可以是热塑性材料[如聚氯乙烯(PVC)/聚乙烯(PE)、氯化聚乙烯(PEC)和聚异丁烯(PIB)]、或弹性材料[象氯化硫化聚乙烯(CSM)、聚氯丁烯(氯丁橡胶)(CR)和异戊二烯一异丁烯(丁基橡胶)(IIR)].
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PEC:外围事件控制器
通过外围事件控制器(PEC)的八通道中断驱动单周期数据传送设备通过外围事件控制器(PEC)的八通道中断驱动单周期数据传送设备
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PEC:脉冲涡流
来自GE传感与检测科技的Pulsec采用了全新的脉冲涡流(PEC)技术来检测次表面的裂纹,尤其适用于航空航天领域. 这个便携式涡流探伤仪由电池驱动,在检测飞机多层结构时,它可提供强大的诊断图像和深度分辨率.
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PEC:佩奇
西部的梅托希加(Metohija)盆地位于阿尔巴尼亚的边界,属于白德林(Beli Drim)河流域,主要城市是佩奇(Pec)和普里兹伦(Prizren). 科索沃的矿物资源包括褐煤、沥青和非铁金属. 其土壤在巴尔幹半岛国家中属于最肥沃之列,
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PEC:abbr. printed electronic circuits; 印制电路
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