This paper revisits the problem of bumpless transfer control(BTC) for discrete-time nondeterministic switched linear systems. The general case of asynchronous switching is considered for the first time in the field of...This paper revisits the problem of bumpless transfer control(BTC) for discrete-time nondeterministic switched linear systems. The general case of asynchronous switching is considered for the first time in the field of BTC for switched systems. A new approach called interpolated bumpless transfer control(IBTC) is proposed, where the bumpless transfer controllers are formulated with the combination of the two adjacent modedependent controller gains, and are interpolated for finite steps once the switching is detected. In contrast with the existing approaches, IBTC does not necessarily run through the full interval of subsystems, as well as possesses the time-varying controller gains(with more flexibility and less conservatism) achieved from a control synthesis allowing for the stability and other performance of the whole switched system. Sufficient conditions ensuring stability and H_(∞) performance of the underlying system by IBTC are developed, and numerical examples verify the theoretical findings.展开更多
目的 在胆总管取石术后使用100 mL的0.9%氯化钠注射液冲洗胆总管,观察是否能提高残石的清除率。方法 纳入该院接受内镜逆行胰胆管造影术(ERCP)联合碎石术的胆总管结石(≥12 mm)患者112例,对取石后胆总管造影显示结石完全清除者,行管腔...目的 在胆总管取石术后使用100 mL的0.9%氯化钠注射液冲洗胆总管,观察是否能提高残石的清除率。方法 纳入该院接受内镜逆行胰胆管造影术(ERCP)联合碎石术的胆总管结石(≥12 mm)患者112例,对取石后胆总管造影显示结石完全清除者,行管腔内超声检查术(IDUS),观察有无胆总管残石。根据IDUS下所观察到的残石数量来确定评分:大量结石碎片为1分;少量结石碎片为2分;完全清除为3分。分别在ERCP清除胆总管结石,以及用50 mL和100 mL 0.9%氯化钠注射液冲洗后,行IDUS检查,并对结石数量进行评分。结果 取石术后未予以0.9%氯化钠注射液进行胆总管冲洗时,所有患者均未达到3分;经50 mL 0.9%氯化钠注射液冲洗后,有45例(40.18%)患者评分为3分;经100 mL 0.9%氯化钠注射液冲洗后,有99例(88.39%)患者评分为3分。多因素Logistic回归分析显示,胆总管直径> 15 mm (OR=4.90,95%CI:1.19~22.57,P=0.013)、胆总管角度(胆总管造影中胆总管的轴线与胆总管壶腹轴线之间的成角)≤140°(OR=6.92,95%CI:1.83~38.98,P=0.047)及十二指肠憩室(OR=4.10,95%CI:1.14~16.90,P=0.041)是使用100 mL 0.9%氯化钠注射液冲洗失败的独立危险因素。结论 用100 mL 0.9%氯化钠注射液冲洗胆道,可有效清除碎石术后胆总管残石。展开更多
Among the 116 actinomycetes collected from marine sediments of the Yellow Sea,56 grew slowly and appeared after 2?3 weeks of incubation.Among the 56 strains,only 3 required seawater(SW) for growth,and 21 grew well in ...Among the 116 actinomycetes collected from marine sediments of the Yellow Sea,56 grew slowly and appeared after 2?3 weeks of incubation.Among the 56 strains,only 3 required seawater(SW) for growth,and 21 grew well in the medium prepared with SW rather than distilled water(DW),while the remaining 32 grew well either with SW or with DW.Six representatives with different morphological characteristics,including 1 SW-requiring strain and 5 well-growing with SW strains,were selected for phy-logenetic analysis based on 16S rRNA gene.Two strains belong to Micrococcaceae and Nocardiopsaceae respectively.The other 4 strains belong to the family of Streptomycetaceae.In the analyzed 6 strains,one was related to Nocardiopsis spp.and the other three were related to Streptomyces spp.,representing new taxa.Bioactivity testing of fermentation products from 3 SW-requiring strains and 21 well-growing with SW strains revealed that 17 strains possessed remarkable activities against gram-positive pathogen or/and tumor cells,suggesting that they were prolific resources for natural drug discovery.展开更多
基金partially supported by the National Natural Science Foundation of China (62225305,12072088)the Fundamental Research Funds for the Central Universities,China (HIT.BRET.2022004,HIT.OCEF.2022047,JCKY2022603C016)China Scholarship Council (202306120113)。
文摘This paper revisits the problem of bumpless transfer control(BTC) for discrete-time nondeterministic switched linear systems. The general case of asynchronous switching is considered for the first time in the field of BTC for switched systems. A new approach called interpolated bumpless transfer control(IBTC) is proposed, where the bumpless transfer controllers are formulated with the combination of the two adjacent modedependent controller gains, and are interpolated for finite steps once the switching is detected. In contrast with the existing approaches, IBTC does not necessarily run through the full interval of subsystems, as well as possesses the time-varying controller gains(with more flexibility and less conservatism) achieved from a control synthesis allowing for the stability and other performance of the whole switched system. Sufficient conditions ensuring stability and H_(∞) performance of the underlying system by IBTC are developed, and numerical examples verify the theoretical findings.
文摘目的 在胆总管取石术后使用100 mL的0.9%氯化钠注射液冲洗胆总管,观察是否能提高残石的清除率。方法 纳入该院接受内镜逆行胰胆管造影术(ERCP)联合碎石术的胆总管结石(≥12 mm)患者112例,对取石后胆总管造影显示结石完全清除者,行管腔内超声检查术(IDUS),观察有无胆总管残石。根据IDUS下所观察到的残石数量来确定评分:大量结石碎片为1分;少量结石碎片为2分;完全清除为3分。分别在ERCP清除胆总管结石,以及用50 mL和100 mL 0.9%氯化钠注射液冲洗后,行IDUS检查,并对结石数量进行评分。结果 取石术后未予以0.9%氯化钠注射液进行胆总管冲洗时,所有患者均未达到3分;经50 mL 0.9%氯化钠注射液冲洗后,有45例(40.18%)患者评分为3分;经100 mL 0.9%氯化钠注射液冲洗后,有99例(88.39%)患者评分为3分。多因素Logistic回归分析显示,胆总管直径> 15 mm (OR=4.90,95%CI:1.19~22.57,P=0.013)、胆总管角度(胆总管造影中胆总管的轴线与胆总管壶腹轴线之间的成角)≤140°(OR=6.92,95%CI:1.83~38.98,P=0.047)及十二指肠憩室(OR=4.10,95%CI:1.14~16.90,P=0.041)是使用100 mL 0.9%氯化钠注射液冲洗失败的独立危险因素。结论 用100 mL 0.9%氯化钠注射液冲洗胆道,可有效清除碎石术后胆总管残石。
文摘Among the 116 actinomycetes collected from marine sediments of the Yellow Sea,56 grew slowly and appeared after 2?3 weeks of incubation.Among the 56 strains,only 3 required seawater(SW) for growth,and 21 grew well in the medium prepared with SW rather than distilled water(DW),while the remaining 32 grew well either with SW or with DW.Six representatives with different morphological characteristics,including 1 SW-requiring strain and 5 well-growing with SW strains,were selected for phy-logenetic analysis based on 16S rRNA gene.Two strains belong to Micrococcaceae and Nocardiopsaceae respectively.The other 4 strains belong to the family of Streptomycetaceae.In the analyzed 6 strains,one was related to Nocardiopsis spp.and the other three were related to Streptomyces spp.,representing new taxa.Bioactivity testing of fermentation products from 3 SW-requiring strains and 21 well-growing with SW strains revealed that 17 strains possessed remarkable activities against gram-positive pathogen or/and tumor cells,suggesting that they were prolific resources for natural drug discovery.
