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文章在研究S&C算法和Park算法的基础上,提出一种基于训练序列的改进的正交频分复用（OFDM）同步算法。改进后的算法只使用一个训练符号,并通过对训练符号在时域乘以差分序列来消除定时同步中的峰值平台问题,通过对接收端和发射端的训练符号在频域的自相关性来估计载波整数倍频偏。改进后的算法在定时同步和载波频偏的纠正上较S&C算法有了较大的提高。

Objective: To explore the association between childhood growing environment and depressive symptoms in young old persons aged 60 to 74 years. Methods: The data of the fourth wave of China Health and Retirement Longitudinal Study in 2018 and the life course survey in 2014 were used to secondary analysis. A total of 7 642 young old persons aged 60 to 74 years were included, and the 10-item of the Center for Epidemiological Studies Depression (CES-D-10) scale was used to evaluate the depressive symptoms. The generalized linear mixed effects model was used to explore the relationship between childhood growing environment and depressive symptoms in the young old persons. Results: The detection rate of depressive symptoms occurrence in the young old persons was 37.2%. The risk factors of depressive symptoms included female (OR = 1.89), rural (OR = 1.35) having hunger experience (OR = 1.22), poor relationship with male dependents (OR = 1.72) female caregiver's experiences of being bedridden due to illness( OR = 1.38 ), community insecurity (OR = 1.59), more harmonious neighborhood relationship (OR = 1.2) and less harmonious neighborhood relationship (OR = 1.81) The protective factors of depressive symptoms occurrence included moderate (OR = 0.79) and high (OR = 0.5) per capita household income, and educated father( OR = 0.84 )(P<0.05) Conclusion: Childhood growing environment is an influential factor of depressive symptoms in the young old persons. The long-term health effects of childhood environment should be paid attention to. [ABSTRACT FROM AUTHOR]

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department 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.)

Early diagnosis and accurate assessment of liver inflammation and fibrosis is particularly important for the therapeutic intervention and prognosis of chronic liver diseases. This article summarizes the diagnostic efficacy of Golgi protein 73 (GP73) for chronic liver diseases by reviewing related clinical studies on GP73 and the diagnosis and prognosis of liver cancer, liver fibrosis, and liver inflammation. The analysis shows that besides liver cancer, GP73 is closely associated with the degree of liver fibrosis and prognosis and can better reflect liver inflammatory damage. GP73 combined with other serum markers can improve the noninvasive diagnosis of chronic liver diseases. [ABSTRACT FROM AUTHOR]

Copyright of Lubrication Engineering (0254-0150) is the property of Editorial Office of LUBRICATION 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.)

Copyright of Journal of Heilongjiang University of Science & Technology is the property of Journal of Heilongjiang University of Science & Technology Editorial Department 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 Garden Construction & Urban Planning is the property of Omniscient Pte. 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.)