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在高层和超高层建筑中采用钢管混凝土结构,可充分利用空钢管所具有的强度和刚度,并能较好地解决混凝土硬化时间较长与施工速度之间的矛盾。但由此也会带来这样的问题,即在结构施工过程中,构件所受长期荷载随施工过程逐渐增加,徐变持续发展,混凝土卸载,内力重新分布,导致构件稳定承载力降低。本文运用DirichLet级数建立管内混凝土徐变模型,并应用非线性有限元软件ABAQUS对钢管混凝土徐变以及承载力进行了有限元计算,较好地模拟了钢管混凝土的徐变过程。本文回归分析了钢管混凝土的徐变性质,并认为可以用初应力的方法粗略估计徐变构件对承载力的影响。

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Copyright of Journal of Mechanical Strength / Jixie Qiangdu is the property of Zhengzhou Research Institute of Mechanical 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.)

Objective To study the protective effect of TSP-1 knockout on acute liver injury induced by carbon tetrachloride in mice. Methods Sixteen C57 BL/6 J mice and eight TSP-1 gene knockout mice were selected for the study. The C57 BL/6 J mice were divided into two groups, WT group and WT+CCl4 group, while the TSP-1 gene knockout mice were grouped as TSP-1-/-+CCl4 group. The WT+CCl4 and TSP-1-/-+CCl4 groups received intraperitoneal injection of 0.5 mL CCl4+9.5 mL/kg olive oil to establish an acute liver injury model, whereas the WT group was given an intraperitoneal injection of 10 mL/kg olive oil as the control. The extent of liver damage and inflammatory response in each group of mice was observed through HE staining and measurement of serum levels of ALT, AST, IL-6, and TNF-α. Additionally, the content of MDA and GSH in liver tissues was determined, and apoptosis was detected by immunohistochemistry and TUNEL staining. Results Knockout of TSP-1 significantly ameliorated acute liver injury induced by CCl4, as evidenced by decreased serum levels of AST, ALT, IL-6, and TNF-α, reduced hepatocyte necrosis, decreased MDA content, increased GSH content, decreased apoptosis, and downregulation of caspase-3 expression in liver tissues. Conclusion Knockout of TSP-1 exerts a marked protective effect against CCl4-induced acute liver injury in mice, possibly through its involvement in the inhibition of inflammation, oxidative stress, and apoptosis. [ABSTRACT FROM AUTHOR]

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society 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 Journal of Chongqing University of Technology (Natural Science) is the property of Chongqing University of Technology 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.)

Sonar images are prone to problems such as low contrast, low resolution, and edge distortion, so it is difficult to accurately separate effective signals from noise when removing noise from sonar images, resulting in reduced image contrast, unclear edge contours, and severe detail loss after denoising. Therefore, this paper proposes a sonar image denoising algorithm based on adaptive Wiener filtering and 2D-VMD (Two Dimensional Variational Mode Decomposition). First, a noisy image is decomposed using 2D-VMD to obtain a series of sub modes with different center frequencies. Effective modal components are obtained via correlation coefficients and structural similarity, then processed by adaptive Wiener filtering, and finally the filtered modal components are reconstructed to remove noise. The experimental results show that the proposed image denoising algorithm achieves the best results in terms of correlation coefficient and structural similarity, with a peak signal-to-noise ratio slightly lower than that of NSST domain denoising. Taking into account objective data and visual effects, the algorithm proposed in this paper achieves the best performance in image details and edge preservation after removing noise. [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 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.)

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Copyright of Journal of Architecture & Civil Engineering is the property of Chang'an Daxue Zazhishe 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.)

[Objective] To explore the synergistic effect and reduction effect of two kinds of adjuvants, Hasauteng and Jijian, on the control of thrips with emamectin benzoate and spinetoram. [Method] The field efficacy trials were conducted by spraying . The recommended dose of Emamectin benzoate and Spinetoram tank-mixed with Hasuteng 1 000-fold dilution and Jijian 2 000-fold dilution, respectively, to determine the droplets, coverage ratio of droplet, and field control on Thrips palmi karny. [ Result] When using emamectin benzoate to prevent and control thrips, adding Hasuteng or Jijian adjuvant could improve the control effect. When using emamectin benzoate and spinetoram to control thrips, adding Hasuteng adjuvant could reduce the amount of pesticides by 30%, and adding Jijian adjuvant could reduce the amount of pesticides by 20%. [Conclusion]When using emamectin benzoate and spinetoram to control thrips, it was recommended to add Hasuteng adjuvant in practice, which could reduce the use of pesticides and improve the control effect. [ABSTRACT FROM AUTHOR]

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Copyright of Machine Tool & Hydraulics is the property of Guangzhou Mechanical Engineering Research Institute (GMERI) 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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