We developed a model of a quantum Otto engine using two coupled two-level atoms.Based on the platform,we show that frequency detuning and the coupling strength induced by dipoledipole interactions can lead to decohere...We developed a model of a quantum Otto engine using two coupled two-level atoms.Based on the platform,we show that frequency detuning and the coupling strength induced by dipoledipole interactions can lead to decoherence by disrupting coherent energy exchange.We focus on fundamental thermodynamic quantities,including heat absorption,release to heat baths,work done and efficiency.It is noteworthy that the interatomic coupling strength and frequency detuning do not merely affect the shape of the work and the efficiency but ultimately govern its quantitative magnitude.In the field of quantum thermodynamics,we have established an upper bound efficiency that is stricter than the Carnot limit.Moreover,our analysis confirms that quantum coherence enables the system to exceed the efficiency threshold of a classical Otto heat engine.The second law of thermodynamics holds all the while.Our results constitute a step forward in the design of conceptually new quantum thermodynamic devices which take advantage of uniquely quantum resources of quantum coherence.展开更多
目的:Meta分析钢板与外固定架固定治疗AO-C型桡骨远端骨折的临床疗效。方法:检索PubMed、Embase、Cochrane Library、Web of Science、中国知网、万方、维普和SinoMed数据库所有关于AO-C型桡骨远端骨折的随机对照临床试验的文献,检索时...目的:Meta分析钢板与外固定架固定治疗AO-C型桡骨远端骨折的临床疗效。方法:检索PubMed、Embase、Cochrane Library、Web of Science、中国知网、万方、维普和SinoMed数据库所有关于AO-C型桡骨远端骨折的随机对照临床试验的文献,检索时限均从各数据库建库到2023年6月30日。纳入研究参照Cochrane手册(Version6.3,2022)进行信息提取、文献质量评价,采用RevMan 5.4软件进行发表偏倚风险评价、检验异质性并进行Meta分析。结局指标为:影像学解剖指标(掌倾角、尺偏角、桡骨高度)、腕关节活动度(屈伸、旋转、尺桡偏)、并发症发生率、手术治疗情况比较(手术出血量、手术时间、住院时间、骨折愈合时间)和腕关节功能评分及相关量表。结果:(1)共纳入28项研究,患者共计2192例,包括1096例钢板内固定组和1096例外固定架组。(2)Meta分析结果显示:外固定架组的手术出血量[MD=-37.93,95%CI(-48.54,-27.31),P<0.00001]、手术时间[MD=-31.58,95%CI(-48.96,-14.20),P=0.0004]、住院时间[MD=-4.58,95%CI(-5.44,-3.71),P<0.00001]、骨折愈合时间[MD=-0.88,95%CI(-1.35,-0.41),P=0.0002]均显著优于钢板内固定组(P<0.05)。(3)两组的掌倾角[MD=-0.17,95%CI(-0.95,0.61),P=0.68]、尺偏角[MD=0.22,95%CI(-0.73,1.17),P=0.65]、桡骨高度[MD=-0.24,95%CI(-1.15,0.67),P=0.60],屈伸[MD=-5.63,95%CI(-11.85,0.58),P=0.08]、旋转[MD=-5.80,95%CI(-12.77,1.17),P=0.10]、尺桡偏[MD=-2.86,95%CI(-10.87,5.15),P=0.48],并发症发生率[RR=0.96,95%CI(0.63,1.46),P=0.83],Gartland-Werley腕部临床评分[MD=0.13,95%CI(-0.80,1.06),P=0.78]、Gartland-Werley腕部临床评分优良率[RR=0.93,95%CI(0.87,1.01),P=0.08]、Cooney腕关节评分优良率[RR=0.99,95%CI(0.62,1.59),P=0.98]、腕关节DASH评分[MD=-4.67,95%CI(-14.96,5.62),P=0.37]的差异均无统计学意义(P>0.05)。结论:与钢板内固定相比,外固定架治疗AO-C型桡骨远端骨折可以显著减少手术出血量、缩短手术时间与住院时间和骨折愈合时间,其影像学解剖指标、腕关节活动度、并发症发生率和腕关节功能评分两者相当。展开更多
基金supported by University-Industry Collaborative Education Program(Project No.220506627183928)。
文摘We developed a model of a quantum Otto engine using two coupled two-level atoms.Based on the platform,we show that frequency detuning and the coupling strength induced by dipoledipole interactions can lead to decoherence by disrupting coherent energy exchange.We focus on fundamental thermodynamic quantities,including heat absorption,release to heat baths,work done and efficiency.It is noteworthy that the interatomic coupling strength and frequency detuning do not merely affect the shape of the work and the efficiency but ultimately govern its quantitative magnitude.In the field of quantum thermodynamics,we have established an upper bound efficiency that is stricter than the Carnot limit.Moreover,our analysis confirms that quantum coherence enables the system to exceed the efficiency threshold of a classical Otto heat engine.The second law of thermodynamics holds all the while.Our results constitute a step forward in the design of conceptually new quantum thermodynamic devices which take advantage of uniquely quantum resources of quantum coherence.
文摘目的:Meta分析钢板与外固定架固定治疗AO-C型桡骨远端骨折的临床疗效。方法:检索PubMed、Embase、Cochrane Library、Web of Science、中国知网、万方、维普和SinoMed数据库所有关于AO-C型桡骨远端骨折的随机对照临床试验的文献,检索时限均从各数据库建库到2023年6月30日。纳入研究参照Cochrane手册(Version6.3,2022)进行信息提取、文献质量评价,采用RevMan 5.4软件进行发表偏倚风险评价、检验异质性并进行Meta分析。结局指标为:影像学解剖指标(掌倾角、尺偏角、桡骨高度)、腕关节活动度(屈伸、旋转、尺桡偏)、并发症发生率、手术治疗情况比较(手术出血量、手术时间、住院时间、骨折愈合时间)和腕关节功能评分及相关量表。结果:(1)共纳入28项研究,患者共计2192例,包括1096例钢板内固定组和1096例外固定架组。(2)Meta分析结果显示:外固定架组的手术出血量[MD=-37.93,95%CI(-48.54,-27.31),P<0.00001]、手术时间[MD=-31.58,95%CI(-48.96,-14.20),P=0.0004]、住院时间[MD=-4.58,95%CI(-5.44,-3.71),P<0.00001]、骨折愈合时间[MD=-0.88,95%CI(-1.35,-0.41),P=0.0002]均显著优于钢板内固定组(P<0.05)。(3)两组的掌倾角[MD=-0.17,95%CI(-0.95,0.61),P=0.68]、尺偏角[MD=0.22,95%CI(-0.73,1.17),P=0.65]、桡骨高度[MD=-0.24,95%CI(-1.15,0.67),P=0.60],屈伸[MD=-5.63,95%CI(-11.85,0.58),P=0.08]、旋转[MD=-5.80,95%CI(-12.77,1.17),P=0.10]、尺桡偏[MD=-2.86,95%CI(-10.87,5.15),P=0.48],并发症发生率[RR=0.96,95%CI(0.63,1.46),P=0.83],Gartland-Werley腕部临床评分[MD=0.13,95%CI(-0.80,1.06),P=0.78]、Gartland-Werley腕部临床评分优良率[RR=0.93,95%CI(0.87,1.01),P=0.08]、Cooney腕关节评分优良率[RR=0.99,95%CI(0.62,1.59),P=0.98]、腕关节DASH评分[MD=-4.67,95%CI(-14.96,5.62),P=0.37]的差异均无统计学意义(P>0.05)。结论:与钢板内固定相比,外固定架治疗AO-C型桡骨远端骨折可以显著减少手术出血量、缩短手术时间与住院时间和骨折愈合时间,其影像学解剖指标、腕关节活动度、并发症发生率和腕关节功能评分两者相当。
