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在轨滑行阶段液氪贮箱长期处于微重力环境。为研究其内部传热和相变过程对大轨道转移飞行器贮供单元工作性能的影响，建立了微重力液氪贮箱CFD模型，采用VOF法及Lee气液相变理论，研究了重力水平、初始液氪温度、初始充满率对微重力下液氪贮箱热分层及压力变化的影响。结果表明：常重力g0下贮箱的压升率分别为10–4 g0，10–5 g0，10–6 g0的1.84倍、1.98倍、2.04倍，微重力下温度分层程度（2~3 K）远低于常重力（90 K）；不同初始液氪温度下贮箱压力随时间呈先降低后升高的变化趋势，且初始液氪温度越低，贮箱压升率越小；微重力下液氪贮箱存在临界初始充满率，当初始充满率Ф>70%时贮箱压升率随初始充满率的升高而增大，当Ф

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Objective: To observe the effects of key muscle movement points acupuncture on neuroelectrophysiological indexes, lower limb motor function and daily living ability in patients with spinal cord injury(SCI). Methods: 98 SCI patients who were admitted to our hospital from December 2022 to June 2023 were divided into control group(conventional rehabilitation training and traditional acupuncture treatment, n=49) and study group (conventional rehabilitation training and key muscle movement point acupuncture treatment, n=49) according to the random number table method. The nerve electrophysiological indexes [root mean square (RMS) and median frequency (MF) of rectus femoris and anterior tibial muscle], lower limb motor function [lower limb motor score (LEMS), modified Ashworth scale(MAS)] and activity of daily living[activity of daily living score(MBI)] were compared between two groups. Results: Compared with control group 2 courses after treatment, the MAS score in study group was lower, and the rectus femoris RMS, rectus femoris MF, tibialis anterior RMS, tibialis anterior MF, LEMS score and MBI score were higher(P<0.05). Conclusion: Key muscle movement points acupuncture for SCI patients, which can improve neuroelectrophysiological indexes, promote the recovery of lower limb motor function, improve the daily living ability of patients. [ABSTRACT FROM AUTHOR]

Copyright of Tunnel Construction / Suidao Jianshe (Zhong-Yingwen Ban) is the property of Tunnel Construction 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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Due to the high residual amount of traditional veterinary drug residue detection methods, the results did not meet the standards. Therefore, a fluorescent probe technology based veterinary drug residue detection method for livestock products was studied. The experiment first validated four extraction solvents as the followings: acetonitrile, ethyl acetate, methanol and n-hexane. The results showed when using strongly polar methanol as the extraction solvent, there were more impurities and a decrease in recovery rate; when using n-hexane extraction, the extraction solution was relatively viscous, and the filter membrane was blocked during ultrafiltration, which was not conducive to ultrafiltration. When using ethyl acetate extraction, except for eight sedatives, the recovery rate of other veterinary drugs was relatively low. When using acetonitrile extraction, the recovery rates of the eight sedatives were basically below 80%. Experimental comparison of five different mixing ratios of acetonitrile ethyl acetate (8:2, 6:4, 1:1, 4:6, 2:8, v:v). The optimal extraction efficiency was achieved using acetonitrile ethyl acetate (8:2, v:v), with an average recovery rate higher than 81.3% . As the drug mass fraction decreasing, the relative fluorescence intensity of E2 was 100%. The results showed that the residual content was less than 0.3 mg · L-1 (0.1, 0.1, 0.2, 0, 0.1), which met the requirements of the Ministry of Agriculture of China for the inspection of this product. By selecting and optimizing the extraction agent, it was found that acetonitrile ethyl acetate (8:2, v:v) had the best extraction effect. The residual content in the test results was less than 0.3 mg · L-1. This new type of biosensing technology could achieve rapid detection of commonly used drugs in animal food, laying the foundation for research on animal food safety. [ABSTRACT FROM AUTHOR]

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