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主动锁模半导体激光器腔内光脉冲幅度的变化
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作者 陈建国 李大义 潘大任 《四川大学学报(自然科学版)》 CAS CSCD 1989年第3期299-304,共6页
用速率方程讨论主动锁模半导体激光器,考虑了光脉冲的传输效应和各光学元件对光脉冲的影响.根据泵浦信号每一周期后系统状态应重现这一条件,得到了短光脉冲幅度在腔内随位置的变化,并进而求出输出功率及系统的其他一些重要参量.
关键词 锁模 半导体 光脉冲幅度
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Identification of potential internal control genes for real-time PCR analysis during stress response in Pyropia haitanensis 被引量:1
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作者 王霞 冯建华 +3 位作者 黄爱优 何林文 牛建峰 王广策 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2017年第6期1432-1441,共10页
Pyropia haitanensis has prominent stress-resistance characteristics and is endemic to China. Studies into the stress responses in these algae could provide valuable information on the stress-response mechanisms in the... Pyropia haitanensis has prominent stress-resistance characteristics and is endemic to China. Studies into the stress responses in these algae could provide valuable information on the stress-response mechanisms in the intertidal Rhodophyta. Here, the effects of salinity and light intensity on the quantum yield of photosystem II in Py. haitanensis were investigated using pulse-amplitude-modulation fluorometry. Total RNA and genomic DNA of the samples under different stress conditions were isolated. By normalizing to the genomic DNA quantity, the RNA content in each sample was evaluated. The cDNA was synthesized and the expression levels of seven potential internal control genes were evaluated using qRT-PCR method. Then, we used geNorm, a common statistical algorithm, to analyze the qRT-PCR data of seven reference genes. Potential genes that may constantly be expressed under different conditions were selected, and these genes showed stable expression levels in samples under a salinity treatment, while tubulin, glyceraldehyde- 3-phosphate dehydrogenase and actin showed stability in samples stressed by strong light. Based on the results of the pulse amplitude-modulation fluorometry, an absolute quantification was performed to obtain gene copy numbers in certain stress-treated samples. The stably expressed genes as determined by the absolute quantification in certain samples conformed to the results of the geNorm screening. Based on the results of the software analysis and absolute quantification, we proposed that elongation factor 3 and 18S ribosomal RNA could be used as internal control genes when the Py. haitanensis blades were subjected to salinity stress, and that a-tubulin and 18S ribosomal RNA could be used as the internal control genes when the stress was from strong light. In general, our findings provide a convenient reference for the selection of internal control genes when designing experiments related to stress responses in Py. haitanensis. 展开更多
关键词 real-time quantitative PCR housekeeping genes internal control genes stress responding Pyropia haitanensis
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A Novel Low Density Parity Check Coded Differential Amplitude and Pulse Position Modulation Free-Space Optical System for Turbulent Channel 被引量:3
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作者 Yin Liang Hua Zhang +2 位作者 Limin Chen Xiaoping Liu Xuehong Lin 《China Communications》 SCIE CSCD 2017年第3期198-206,共9页
Based on the proposed partly equidifferent mapping and its specific Differential Amplitude and Pulse Position Modulation(DAPPM) demodulation, a modified FSO scheme for turbulent channel is designed and analyzed. The n... Based on the proposed partly equidifferent mapping and its specific Differential Amplitude and Pulse Position Modulation(DAPPM) demodulation, a modified FSO scheme for turbulent channel is designed and analyzed. The novel Low Density Parity Check(LDPC) coded 4×4 and 4×8 DAPPM Free-Space Optical communication(FSO) system is constructed. The Monte Carlo simulation results show approximately 2d B transmit power reduction against classical LDPC-DAPPM at the identical Bit-Error-Rate in strong turbulent channel. The proposed partly equidifferent mapping is compatible with other modulations, so it enables widespread adoption in other coded FSO systems. 展开更多
关键词 DAPPM LDPC partly equidifferent mapping FSO turbulent
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