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纳米纤维素/木质素抗紫外膜的制备与性能 被引量:3
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作者 苏雯皓 舒璇 +4 位作者 董茂林 罗丹 刘秀宇 戴红旗 卞辉洋 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2022年第12期93-99,共7页
采用顺丁烯二酸预处理杨木木屑提取得到木质素,按照不同含量将其与纳米纤维素机械混合,经抽滤干燥工艺得到了纳米纤维素/木质素复合膜材料。采用扫描电镜、万能拉力机、紫外分光光度计、分光密度计和热重分析仪对材料微观形貌、力学性... 采用顺丁烯二酸预处理杨木木屑提取得到木质素,按照不同含量将其与纳米纤维素机械混合,经抽滤干燥工艺得到了纳米纤维素/木质素复合膜材料。采用扫描电镜、万能拉力机、紫外分光光度计、分光密度计和热重分析仪对材料微观形貌、力学性能、光学性能及热稳定性进行测试。结果表明,纯纳米纤维素(CNF)膜表面光滑致密,木质素的添加使复合膜的表面粗糙度从19.8 nm增加到62.7 nm。随着木质素含量的增加,复合膜的拉伸强度从140 MPa降低到67.6MPa。木质素质量分数为5%时,弹性模量最高为7.11 GPa。同时,木质素赋予了材料优异的紫外屏蔽性能,复合膜对UVA和UVB波段的屏蔽率分别为99.23%和100%。此外,木质素的引入提高了复合膜的热稳定性,最高热失重降解温度为313℃。纳米纤维素/木质素复合薄膜在食品包装、紫外线防护和农用地膜等领域显示出很好的应用前景。 展开更多
关键词 纳米纤维素 木质素 复合材料 紫外屏蔽
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Patient-directed vs.fixed-volume PEG for colonoscopy preparation:a randomized controlled trial 被引量:2
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作者 Jixiang Zhang Xuemei Jia +8 位作者 Yuanmei Guo Haotian Jiang Jiaming Hu Siwei Wang Binglu Huang wenhao su Jun Liu Xiaoli Wang Weiguo Dong 《Precision Clinical Medicine》 2022年第2期117-124,共8页
Background:Individualization using different volumes of polyethylene glycol is widely regarded as the optimal solution for bowel preparation,while the patient-directed regimen we propose may serve as a reliable indivi... Background:Individualization using different volumes of polyethylene glycol is widely regarded as the optimal solution for bowel preparation,while the patient-directed regimen we propose may serve as a reliable individual solution.This study aimed to assess the efficacy,safety,and satisfaction of bowel preparation with a patient-directed regimen.Methods:Patients in the fixed-volume group ingested the same amount of PEG,while those in patient-directed group ingested different amount according to stool consistency or stool water content.Results:After filtering by exclusion criteria,428 individuals in the fixed-volume group and 103 in the patient-directed group were successfully enrolled and analyzed.Eighty-three(80.6%)individuals in the patient-directed group had a reduced polyethylene glycol volume.There was no significant difference in the bowel preparation efficacy between the two groups(90.0%vs.90.3%,χ^(2)=0.01;p=0.918).Patients in the patient-directed group complained of fewer adverse effects(53.0%vs.36.9%,χ^(2)=8.655;p=0.003),especially vomiting(13.6%vs.1.0%,χ^(2)=13.304;p<0.001).Regarding comfort during bowel preparation,the degree of comfort was not significantly different between groups.Furthermore,the willingness rate for further colonoscopy in the patient-directed group was significantly higher than that in the fixed-volume group(90.3%vs.77.1%,χ^(2)=8.912;p<0.05).Multivariable logistic regression analysis showed that the body mass index served as an independent factor impacting quality of bowel preparation with the patient-directed regimen(OR 1.16,95%CI 1.00–1.34;p=0.043).Conclusions:Without decreasing the bowel preparation efficacy,the patient-directed regimen increased the safety and satisfaction of bowel preparation and is expected to be a regular and individual solution for bowel preparation.Individuals with a lower body mass index are more likely to undertake this new regimen. 展开更多
关键词 bowel preparation patient-directed INDIVIDUALIZATION EFFICACY safety
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