改性后超稳Y型分子筛的晶体结构热稳定性增加，脉冲微反试验的正已烷裂解活性下降而烯烃选择性得到提高。
The thermal stability ofthe crystal structure of modified USY zeolite is increased, and n-hexane cracking activity ina pulse micro-reactor is decreased, while the olefin selectivity is increased.
经过暗适应的晶体柱可以对不同物距的目标形成清晰的正重叠像，像的大小随物距的增大而减小；
A real optical superposition image was formed by dark-adapted crystalline cones for an object at different distances and its size decreased as the object distance increased.
提出了用正、负折射率介质层交替排列构成的一维光子晶体模型，并且用传输矩阵法计算了该模型的透射谱，从理论上分析了其带隙结构。
Plane wave expansion techniques and transfer matrix method are used to study the two-dimensional photonic crystal with a triangular lattice of dielectric cylinders in air.
测量结果证明窄频带晶体三极管噪声的振幅分布，和遵守正态律的振幅分布相符合。
It is found that the amplitude distribution of nai-row band semiconductor noise agrees with that of the normal law distribution.
这个探测器是由两层氧正硅酸镥晶体晶体和位置灵敏型光电倍增管组成。
The detector consists of two layers of LSO crystals and a position sensitive photomultiplier tube .
本文简述了晶体管作开关运用时集电结由反偏状态向正偏状态转化的物理本质。
This paper illustrates the physical essence transferred for the Collector Junction from reverse bias to forward bias.
准晶体和普通晶体一样由正几何体拼成。
本文对功率晶体管(GTR)正偏二次击穿测试仪的研制进行了说明，并给出了主要技术参数。
The development of the test instrument for forward-biased second breakdown for characteristics of power transistors (GIR) is described and main parameters are given.
本文对功率晶体管(GTR)正偏二次击穿测试仪的研制进行了说明，并给出了主要技术参数。
The development of the test instrument for forward-biased second breakdown for characteristics of power transistors (GIR) is described and main parameters are given.
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