In this work, Bi2XO6(X = W, Mo) are synthesized at different temperatures. The results of tests find the optimal temperatures of Bi_(2)WO_(6) and Bi_(2)MoO_(6) are 180 and 160 °C(BW-180, BM-160). Then, BW-180 and...In this work, Bi2XO6(X = W, Mo) are synthesized at different temperatures. The results of tests find the optimal temperatures of Bi_(2)WO_(6) and Bi_(2)MoO_(6) are 180 and 160 °C(BW-180, BM-160). Then, BW-180 and BM-160 are further compounded with different contents of CuS. The results of photoelectrochemical(PEC) tests show that CuS can improve the PEC performance of semiconductor materials, and it has better performance when CuS mass fraction is 5%. These maybe the photoelectron potentials generated by Cu S/Bi_(2)XO_(6)(X = Mo, W) heterojunction reduce the combination of photogenerated electrons and holes. When the PEC sensor based on 5%-CuS/BW-180 detects Cr(VI), it has a linear range of 1–80 μmol/L with detection limit of 0.95 μmol/L, while the PEC sensor based on 5%-CuS/BM-160 detects Cr(VI) has a linear range of 0.5–230 μmol/L and a detection limit of 0.12 μmol/L. Thus, 5%-CuS/Bi_(2)XO_(6) has potential application in hexavalent chromium detection.展开更多
通过对青藏高原中南部天门洞石笋TM-18b进行230Th测年和稳定同位素测试,建立了倒三冰消期249.89—240.32 ka BP的石笋碳氧同位素记录。结合已发表的、发育在同一洞穴石笋的年代和同位素数据,对倒三冰消期石笋生长记录和同位素序列进行分...通过对青藏高原中南部天门洞石笋TM-18b进行230Th测年和稳定同位素测试,建立了倒三冰消期249.89—240.32 ka BP的石笋碳氧同位素记录。结合已发表的、发育在同一洞穴石笋的年代和同位素数据,对倒三冰消期石笋生长记录和同位素序列进行分析,发现天门洞石笋TM-18b和19TM-3在倒三冰消期弱季风区间分别沉积28.5 mm和13.9 mm,持续时间约6.5 ka和5.2 ka,表明倒三冰消期弱季风区间青藏高原气候较为温暖湿润。南极冰芯记录的大气CO_(2)、CH_(4)浓度及δD的上升和δ^(18)O_(atm)的下降,以及全球海平面的上升支持倒三冰消期弱季风区间青藏高原气候的回暖。弱季风区间石笋δ^(18)O记录显示季风降水贡献减少,说明冰川融水和/或西风水汽可能为区域降水增多、气候变湿提供了大量水汽。展开更多
目的:通过Meta分析评估肌肉超声对重症监护室获得性衰弱(ICU-AW)的早期预测价值,为临床诊断提供依据。方法:检索PubMed、EMbase、the Cochrane Library、Web of Science、中国知网、中国生物医学文献数据库、维普数据库、万方数据库,检...目的:通过Meta分析评估肌肉超声对重症监护室获得性衰弱(ICU-AW)的早期预测价值,为临床诊断提供依据。方法:检索PubMed、EMbase、the Cochrane Library、Web of Science、中国知网、中国生物医学文献数据库、维普数据库、万方数据库,检索时限为建库至2024年3月1日。根据纳入和排除标准来筛选文献,将肌肉超声对ICU-AW的相关诊断试验类文献纳入研究。采用诊断准确性质量评价工具(QUADAS-2)对纳入文献进行质量评价。结果:最终纳入11项研究,涉及重症病人587例。Meta分析结果显示,肌肉超声诊断ICU-AW的合并敏感度、合并特异度、合并阳性似然比、合并阴性似然比、合并诊断比值比分别为0.71[95%CI(0.60,0.80)]、0.78[95%CI(0.74,0.81)]、3.15[95%CI(2.72,3.66)]、0.38[95%CI(0.27,0.52)]、8.33[95%CI(5.41,12.83)]。综合受试者工作特征曲线下面积为0.80[95%CI(0.76,0.83)]。结论:现有证据表明,肌肉超声对早期ICU-AW具有良好的预测价值,可为临床检测ICU-AW提供参考。展开更多
基金financial support from the National Natural Science Foundation of China(Nos.21205030,2198073 and NSFC-U1903217)by the key project of Hubei provincial education department(No.D20171001)Key Laboratory of regional development and environmental response in Hubei Province(No.2019(0A)003)。
文摘In this work, Bi2XO6(X = W, Mo) are synthesized at different temperatures. The results of tests find the optimal temperatures of Bi_(2)WO_(6) and Bi_(2)MoO_(6) are 180 and 160 °C(BW-180, BM-160). Then, BW-180 and BM-160 are further compounded with different contents of CuS. The results of photoelectrochemical(PEC) tests show that CuS can improve the PEC performance of semiconductor materials, and it has better performance when CuS mass fraction is 5%. These maybe the photoelectron potentials generated by Cu S/Bi_(2)XO_(6)(X = Mo, W) heterojunction reduce the combination of photogenerated electrons and holes. When the PEC sensor based on 5%-CuS/BW-180 detects Cr(VI), it has a linear range of 1–80 μmol/L with detection limit of 0.95 μmol/L, while the PEC sensor based on 5%-CuS/BM-160 detects Cr(VI) has a linear range of 0.5–230 μmol/L and a detection limit of 0.12 μmol/L. Thus, 5%-CuS/Bi_(2)XO_(6) has potential application in hexavalent chromium detection.
文摘目的:通过Meta分析评估肌肉超声对重症监护室获得性衰弱(ICU-AW)的早期预测价值,为临床诊断提供依据。方法:检索PubMed、EMbase、the Cochrane Library、Web of Science、中国知网、中国生物医学文献数据库、维普数据库、万方数据库,检索时限为建库至2024年3月1日。根据纳入和排除标准来筛选文献,将肌肉超声对ICU-AW的相关诊断试验类文献纳入研究。采用诊断准确性质量评价工具(QUADAS-2)对纳入文献进行质量评价。结果:最终纳入11项研究,涉及重症病人587例。Meta分析结果显示,肌肉超声诊断ICU-AW的合并敏感度、合并特异度、合并阳性似然比、合并阴性似然比、合并诊断比值比分别为0.71[95%CI(0.60,0.80)]、0.78[95%CI(0.74,0.81)]、3.15[95%CI(2.72,3.66)]、0.38[95%CI(0.27,0.52)]、8.33[95%CI(5.41,12.83)]。综合受试者工作特征曲线下面积为0.80[95%CI(0.76,0.83)]。结论:现有证据表明,肌肉超声对早期ICU-AW具有良好的预测价值,可为临床检测ICU-AW提供参考。
