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为了在解映射过程中尽量减少锁相环的使用,设计了一种基于同步时钟产生的均匀缺口时钟来实现解帧、去FEC（前向纠错）以及OTU2（光传输单元）解映射到ODU2（光数据单元）的同步电路。通过仿真和FPGA（现场可编程门阵列）验证了该电路功能的正确性。结果表明,该电路能够实时、准确地完成OTU2到ODU2的解映射。

Copyright of Journal of Practical Medicine / Shiyong Yixue Zazhi is the property of Journal of Practical Medicine Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of China Rural Water & Hydropower is the property of China Rural Water & Hydropower Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Arid Zone Research / Ganhanqu Yanjiu is the property of Arid Zone Research Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Aiming at the problems of noise interference in the moving target detection by the visual background extractor(ViBe) algorithm, the two-frame differencing method was incorporated into the foreground detection phase of ViBe, and an improved ViBe algorithm(ViBe with two-frame differencing, ViBe-TD) that incorporates two-frame differencing information was proposed. Firstly, the single-threshold form of ViBe( S-ViBe) detection was designed to prepare for the information fusion. Secondly, the fusion of two-frame difference and S-ViBe detection information on pixel points was achieved based on logistic regression model. Finally, the two types of detection information were combined to complete the determination of foreground pixel points. The experimental results show that the ViBe-TD algorithm achieves an average precision of 0. 932, an average recall of 0. 785 and an average F1 value of 0. 842 for the detection on four different scene videos. Compared with the original algorithm, the ViBe-TD algorithm shows an average improvement of 0. 158 in each metric and has a good detection effect. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Frontiers of Computer Science & Technology is the property of Beijing Journal of Computer Engineering & Applications Journal Co Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of University Chemistry is the property of Peking University, College of Chemistry & Molecular Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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To explore the changes of soil bacterial diversity and community composition in tobacco–rice rotation soil under different straw return methods, control (CK), amendment (BP), undisturbed straw return (S0), straw–cow manure compost return (S1), straw–rapeseed cake compost return (S2), and these combined with amendment (S0BP, S1BP, S2BP) conditions were set up in a tobacco–rice rotation pot experiment. The composition of the soil bacterial community was analyzed using 16S rRNA high-throughput sequencing technology. The results of the experiment showed that direct straw return and straw return with amendment can effectively improve soil physical and chemical properties. Straw return combined with amendments significantly increased bacterial community abundance. The S1BP treatment resulted in the highest bacterial community abundance. Each treatment had no significant effect on the soil bacterial community diversity index. Proteobacteria (16.42%-26.01%), Chloroflexi (15.62%-20.46%), Acidobacteriota (8.71%-15.86%), Actinobacteriota (7.08%- 11.47%) and Firmicutes (7.29%-11.74%) were the predominant phyla of soil bacterial communities. However, straw return significantly increased the relative abundances of Proteobacteria and Bacteroidota. Compared with straw return, the straw return with amendment treatments significantly increased the relative abundances of Bacteroidota and Desulfobacterota but markedly decreased the abundances of Acidobacteriota and Actinobacteriota. Furthermore, soil pH, minimum water holding capacity, soil porosity, available potassium, dissolved organic carbon, and microbial biomass carbon content were the main factors affecting bacterial community structure, which had a positive correlation with Desulfobacterota, Proteobacteria, and Bacteroidota but a negative correlation with Nitrospirota, Actinobacteriota, Acidobacteriota, and Armatimonadota. In summary, returning tobacco and rice straw directly or in combination with amendments can improve soil physicochemical properties and increase the abundance of soil bacterial communities. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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