Search

可拆装式箱型轻钢结构房屋采用复杂冷弯构件，节点采用无螺母高强螺栓，结构特殊，力学性能复杂。通过ABAQUS有限元软件建立了箱型房屋精细化模型和多尺度模型，与箱型房屋模块单体的竖向承载力和抗侧性能试验进行了结果对比与验证。分析了底部铰接和底部刚接模型的抗侧刚度，试验的边界条件属于半刚性连接。选取底部铰接的通用模块单体的多尺度模型，研究了房屋高度、柱壁厚度和楼面荷载等对箱型房屋竖向承载力的影响，探讨了模块横向与纵向抗侧性能的差异，研究了顶部荷载、房屋高度、柱壁厚度和螺栓直径等对箱型房屋纵向抗侧性能的影响。结果表明：增加柱壁厚度，竖向承载力提升效果显著，增大房屋高度，竖向承载力降低幅度不大，而楼面荷载等对其几乎无影响；横向抗侧刚度比纵向抗侧刚度提高了约17%，降低房屋高度会提高其弹性变形阶段的纵向抗侧刚度，而竖向荷载、柱壁厚度、螺栓长度和螺栓直径对其影响不大。最后，基于多层箱型房屋的整体受力特征，结合竖向承载力和抗侧性能研究，提出了多层箱型房屋设计方法及设计选用表，可为多层箱型房屋的设计与应用提供参考。

BACKGROUND: Hydrogen, as an antioxidant, can reduce oxidative stress induced by strenuous exercise and achieve the effect of improving fatigue. Several studies have been reported on the potential effects of hydrogen-rich water or hydrogen-rich gas on improving exercise fatigue and athletic performance. OBJECTIVE: To investigate the effects of hydrogen-rich gas inhalation prior to high-intensity exercise on proprioception and muscular endurance performance after exercise fatigue. METHODS: Through a randomized, double-blind, crossover, and repeated measurement experimental design, 24 healthy men were randomly divided into group A and group B, with 12 in each group. In the first phase of the crossover experiment, group A inhaled hydrogen-rich gas (hydrogen group) for 20 minutes and group B inhaled placebo gas (air; placebo group) for 20 minutes. Then, cycle ergometers were used to establish the fatigue model. Visual analog fatigue scale, heart rate variability, knee joint proprioception (passive position perception, joint motion perception, and muscle force perception) and isometric knee extension muscle endurance were tested before and after intervention. After a 7-day washout period, two groups exchanged intervention methods and the above tests were performed again in the second phase of the experiment. Differences between the results of groups A and B in the two phases were compared, and finally the results of the two phases were integrated to compare the overall differences between hydrogen intervention and placebo intervention. RESULTS AND CONCLUSION: In the first phase of the crossover experiment, the visual analog fatigue scale score of the hydrogen group after intervention was significantly lower than that of the placebo group (P < 0.01). The root mean square of the difference between the adjacent R-R, mean low-frequency output power, mean high-frequency output power, and isometric muscle endurance after intervention in the hydrogen group were significantly higher than those in the placebo group (P < 0.05). Passive position perception and joint motion perception after intervention in the hydrogen group were significantly better than those in the placebo group (P < 0.05). There was no significant difference in muscle force perception between the two groups (P > 0.05), but muscle force perception in the placebo group after intervention was significantly worse than that before intervention (P < 0.01). The difference trend of all test results after intervention in the two groups in the first phase of the experiment showed the same results in the second phase of the experiment. The integrated results also showed that the hydrogen group had better test values for the above indicators than the placebo group (P < 0.05). Linear regression analysis showed a positive correlation between post-intervention visual analog fatigue scale scores and passive position perception results (r=0.327, P=0.023), i.e., the higher subjective fatigue level after high-intensity exercise indicated the worse passive position perception results. To conclude, inhaling hydrogen-rich gas before high-intensity exercise can reduce the degree of fatigue after exercise, thereby improving proprioception and muscle endurance performance, which may be a new strategy to reduce the occurrence of injury. And its effectiveness can be achieved repeatedly. [ABSTRACT FROM AUTHOR]

Copyright of Food & Fermentation Industries is the property of Food & Fermentation Industries 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 Nanjing Agricultural University / Nanjuing Nongye Daxue Xuebao is the property of Journal of Nanjing Agricultural University 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 Bulletin of Soil & Water Conservation is the property of Bulletin of Soil & Water Conservation 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 Nanjing Agricultural University / Nanjuing Nongye Daxue Xuebao is the property of Journal of Nanjing Agricultural University 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.)

以实际750 kV变电站避雷针刚性法兰节点为依据,为改善变电站中法兰节点破坏的现状,提出"保险丝"型法兰新型节点设计。通过对2个足尺法兰节点进行试验研究,对比新型和普通法兰节点的应力、应变分布规律,节点承载力、刚度变化及节点破坏模式,得到了两种法兰的不同受力特性。同时,建立了节点有限元模型,分析了设计荷载工况下法兰节点的破坏模式,研究表明:新型法兰节点承载力与普通法兰节点承载力相比有明显提高,提高幅度约为23%,靠近钢管-法兰连接处应力显著降低,法兰受力更加合理;新型法兰的中和轴有所上移,上移距离约为外钢管半径R的33%,螺栓旋转轴位置建议取为距离钢管中心0.67R处,有限元结果与试验结果吻合较好。

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.)

Copyright of Journal of Laser Biology / Acta Laser Biology Sinica is the property of Acta Laser Biology Sinica 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 Occupational Health & Emergency Rescue is the property of Occupational Health & Emergency Rescue 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 Electric Power Automation Equipment / Dianli Zidonghua Shebei is the property of Electric Power Automation Equipment Press 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 Computer Engineering & Applications 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 Chinese Journal of Explosives & Propellants is the property of Chinese Journal of Explosives & Propellants 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 Remote Sensing is the property of Editorial Office of Journal of Remote Sensing & Science Publishing Co. 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 International Architecture 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.)

Copyright of Journal of Tea Science is the property of Journal of Tea Science 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 Food & Machinery is the property of Food & Machinery 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 Chinese Journal of Wildlife / Yesheng Dongwu Xuebao is the property of Chinese Journal of Wildlife 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 Acta Prataculturae Sinica is the property of Acta Prataculturae Sinica 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 Natural Disasters is the property of Gai Kan Bian Wei Hui 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 Laser Technology is the property of Gai Kan Bian Wei Hui 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.)

To investigate the effects of quercetin on human chondrosarcoma cell migration, invasion and epithelial intersti- tial transformation (EMT) and the regulatory role of Janus kinase 2/signal transduction and transcription promoter 3 (JAK2/ STAT3) signaling pathway, human chondrosarcoma SW-1353 cells were cultured in vitro and treated with quercetin of differ- ent concentrations for 24 h. The optimal concentration of quercetin (50.0 μmol/L) was selected by cell counting kit (CCK-8) for subsequent experiments. The cells were divided into control group with no intervention, quercetin group with 50.0 μmol/L quercetin, positive control group with 6.0 μmol/L adriamycin, inhibitor group involving 50.0 μmol/L quercetin +50.0 μmol/L JAK2/STAT3 pathway inhibitor AG490, and activator group involving 50.0 μmol/L quercetin +0.5 μmol/L JAK2/STAT3 path- way activator colivelin. After 24 h of intervention, cell morphology, migration, invasion, and expression levels of JAK2/STAT3 pathway and EMT-related proteins were analyzed by inverted microscope, Transwell chamber and Western blot. The experimental results showed that the optimum concentration of quercetin was determined by CCK-8 method to be 50.0 μmol/L. Compared with the control group, the growth of quercetin group were positive control group were inhibited, the cell migration number, invasion number, expression levels of N-cadherin, Vimentin, fibronectin (FN), p-JAK2 and p-STAT3 in quercetin group and positive control group decreased (P<0.05), E-cadherin expression level increased (P<0.05); compared with quercetin group, the change trend of the above indexes in inhibitor group was more significant (P<0.05), while the change of these indexes in activator group was reversed (P<0.05). Quercetin can inhibit the growth, migration, invasion and EMT progression of human chondrosarcoma SW-1353 cells, possibly by blocking the JAK2/STAT3 signaling pathway. [ABSTRACT FROM AUTHOR]

Copyright of Architectural Journal / Jian Zhu Xue Bao is the property of Architectural Journal 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 Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural 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 Water Conservancy & Electric Power Technology & Application 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.)

Copyright of Progress in Modern Biomedicine is the property of Publishing House of Progress in Modern Biomedicine 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 Food Safety & Quality is the property of Journal of Food Safety & Quality 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 Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica 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 Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural 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 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.)

Copyright of Electronic Communication & Computer Science 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.)

Copyright of Chinese Medical Equipment Journal is the property of Chinese Medical Equipment Journal 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.)