Subjects: Medicine, Pharmacy >> Clinical Medicine submitted time 2024-02-20 Cooperative journals: 《中国全科医学》
Abstract： Background Whether considering the cumulative effect of sustained C-reactive protein（CRP）and distinguishing different aspects of depressive symptoms may be the reasons for the inconsistent conclusions of previous studies on the association between CRP and depressive symptoms among middle-aged and older adults. The relationship between cumulative effects of CRP elevations and different aspects of depressive symptoms in middle-aged and older adults in China is not well understood. Objective This study aims to examine the relationship between cumulative episodes of CRP elevations over two successive determinations and depressive symptoms，as well as somatic and non-somatic retardation，among Chinese middle-aged and older adults. Methods This study used public data from the 2011-2018 Chinese Health and Retirement Longitudinal Study（CHARLS）and included 3 868 subjects. They were categorized based on the frequency of CRP elevations over two consecutive measurements："elevated on zero occasion"（n=2 918），"elevated on one occasion"（n=763），and "elevated on two occasions"（n=187）. Depressive symptoms were assessed using the Center for Epidemiological Studies Depression Scale（CESD-10）in 2011，2015，and 2018，capturing both somatic and non-somatic dimensions. Multiple linear was used to explore the associations between cumulative episodes of CRP elevations over two successive determinations with depressive symptom scores in 2018，as well as the scores of somatic and non-somatic components separately. Multivariate logistic regression was used to investigate the effects of cumulative episodes of CRP elevations on the risk of depressive symptoms in 2018. Results The results of multiple linear regression analysis showed that after adjusting for all covariates，elevated on two occasions compared with elevated on zero occasion，which was an influential factor for the total score of depressive symptoms（β=1.22，P<0.05）， the score of somatic depressive symptoms（β=0.51，P<0.05） and the score of non-somatic symptoms（β=0.71，P<0.05）. Logistic regression analysis showed that after adjusting for all covariates，elevated on two occasions were associated with a higher risk of depressive symptoms than elevated on zero occasion（OR=1.64，95%CI=1.18-2.29）. Conclusion Among Chinese middle-aged and older adults，there is a positive association between cumulative effects of CRP elevations and depressive symptoms，encompassing both somatic and non-somatic retardation. Addressing chronic inflammation and treating chronic inflammatory diseases promptly may help mitigate depression risk.
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-05-24 Cooperative journals: 《工程热物理学报》
Abstract：本文基于预混滞止弱旋火焰系统，以溶于水或乙醇的廉价硝酸盐为前驱物，采用“一步”的雾化火焰方法来合成铜基催化剂纳米颗粒。采用TEM、XRD等分析了合成颗粒的形貌及物相态，进而考察了该催化剂在甲烷催化氧化反应中的催化活性。根据TEM结果，发现乙醇做溶剂时所合成的氧化铜颗粒具有颗粒直径小且结晶度较好的特点。实验结果表明，10 nm氧化铜颗粒体现出良好的甲烷催化性能，但掺杂氧化铝后，铜基催化剂对甲烷的催化性能有所下降，其原因可归结为氧化铝对氧化铜的覆盖作用导致其有效比表面积降低。
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-03-22 Cooperative journals: 《工程热物理学报》
Abstract：对存在非加热起始段的热平板着火问题进行了理论分析，推导出具有局部相似性的解，并采用基于高活化能假设的匹配渐进展开法进一步得到了理论解。非加热的起始段可以降低气流通过加热段时壁面附近的流速，从而更容易引发着火。结果表明，当常温起始段长度 和一般的恒温热平板着火距离 比值 ，此时着火距离 和 的平方根成反比。通过数值计算发现，当 ，局部相似解的误差不超过5%。本文的分析方法可以进一步应用到二维楔形体、三维旋转体边界层等更为复杂边界条件下的着火问题。
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