目的:探讨高髋关节中心技术全髋关节置换术(total hip arthroplasty,THA)治疗CroweⅡ、Ⅲ型发育性髋关节发育不良(developmental dysplasia of hip,DDH)并重度髋关节炎(hip osteoarthritis,HOA)的临床疗效。方法:2018年1月至2020年1月收...目的:探讨高髋关节中心技术全髋关节置换术(total hip arthroplasty,THA)治疗CroweⅡ、Ⅲ型发育性髋关节发育不良(developmental dysplasia of hip,DDH)并重度髋关节炎(hip osteoarthritis,HOA)的临床疗效。方法:2018年1月至2020年1月收治CroweⅡ、Ⅲ型DDH并重度HOA患者74例,37例行解剖型髋关节中心重建为对照组,其中男7例,女30例,年龄42~65(58.40±4.98)岁,身体质量指数(body mass index,BMI)18~29(23.02±2.21)kg·m^(-2)。37例行高髋关节中心技术重建为研究组,其中男5例,女32例,年龄41~65(57.31±5.42)岁,BMI 18~29(23.14±2.07)kg·m^(-2)。患者术前表现髋关节疼痛、功能及关节活动度受限、步态不稳等。比较两组围术期指标,术前及术后3、6、12个月分别评估患者髋关节功能、平衡功能及步态情况,术前及术后12个月测量双下肢长度差、旋转中心水平距离、旋转中心垂直距离、股骨偏心距。结果:术后随访12个月,研究组失访1例,对照组失访2例。研究组手术时间短于对照组,术中出血量少于对照组(P<0.05)。术后3、6个月研究组Harris评分、Berg平衡量表(Berg balance scale,BBS)评分、步速、步频、单步长大于对照组(P<0.05),术后12个月以上指标组间比较,差异无统计学意义(P>0.05);术后12个月,研究组旋转中心垂直距离大于对照组(P<0.05),两组双下肢长度差、旋转中心水平距离、股骨偏心距比较,差异无统计学意义(P>0.05);两组均未出现并发症。结论:两种髋关节中心重建方式应用于DDH并重度HOA患者THA远期效果相当,安全性良好,且高髋关节中心技术重建可缩短手术时间,减少术中出血量,同时在早期恢复患者髋关节功能、平衡功能及步行功能方面具有一定优势。展开更多
We employ several simple numerical experiments to show that the statements that short mean path length or low heterogeneity enhances synchronizability in complex networks could be misleading. Furthermore, we point out...We employ several simple numerical experiments to show that the statements that short mean path length or low heterogeneity enhances synchronizability in complex networks could be misleading. Furthermore, we point out that the impacts of the structural parameters on the synchronizability are complicated even if we could change one structural parameter independently.展开更多
The spiral waves in a system of two-dimensional coupled oscillators with spatial period-2 structure are investigated. We find a sandwiched spiral wave where any adjacent oscillators are in anti-phase. We show that the...The spiral waves in a system of two-dimensional coupled oscillators with spatial period-2 structure are investigated. We find a sandwiched spiral wave where any adjacent oscillators are in anti-phase. We show that the propagation rate of the sandwiched spiral wave is insensitive to the change of the coupling constant. The influences of the local kinetics on the sandwiched spiral wave are also investigated.展开更多
The forced Duffing oscillator has a pair of symmetrical attractors in a proper parameter regime. When a lot of Duffing oscillators are coupled linearly, the system tends to form dusters in which the neighboring oscill...The forced Duffing oscillator has a pair of symmetrical attractors in a proper parameter regime. When a lot of Duffing oscillators are coupled linearly, the system tends to form dusters in which the neighboring oscillators fall onto the same attractor. When the coupling strength is strong, all of the oscillators fall onto one attractor. In this work, we investigate coalescence in the coupled forced Duffing oscillators. Some phenomena are found and explanations are presented.展开更多
The dynamics of coupled Lorenz circuits is investigated experimentally. The partial amplitude death reported in Phys. Rev. E 72, 057201（2005） is verified by physical experiments with electronic circuits. With the in...The dynamics of coupled Lorenz circuits is investigated experimentally. The partial amplitude death reported in Phys. Rev. E 72, 057201（2005） is verified by physical experiments with electronic circuits. With the increase of coupling constant, the coupled circuits undergo the transition from the breakdown of both the reflection symmetry and the translational symmetry to the partial amplitude death. Its stability is also confirmed by analysing the effects of noise.展开更多
Dynamics of a one-dimensional array of non-locally coupled Kuramoto phase oscillators with an external potential is studied. A four-cluster chimera state is observed for the moderate strength of the external potential...Dynamics of a one-dimensional array of non-locally coupled Kuramoto phase oscillators with an external potential is studied. A four-cluster chimera state is observed for the moderate strength of the external potential. Different from the clustered chimera states studied before, the instantaneous frequencies of the oscillators in a synchronized cluster are different in the presence of the external potential. As the strength of the external potential increases, a bifurcation from the two-cluster chimera state to the four-cluster chimera states can be found. These phenomena are well predicted analytically with the help of the Ott-Antonsen ansatz.展开更多
We investigate the collective dynamics of network-organized identical excitable nodes. We theoretically analyze the stability of the rest state and propose that there are two different transition paths： the stationar...We investigate the collective dynamics of network-organized identical excitable nodes. We theoretically analyze the stability of the rest state and propose that there are two different transition paths： the stationary path and the oscillatory path. We find that, although the onset of collective dynamics strongly depend on the network topology, the local dynamics and how local nodes interact with each other decide the transition path and the involved bifurcation.展开更多
Dynamics in coupled Dufling oscillators with two coexisting symmetrical attractors is investigated. For a pair of Dufl^ng oscillators coupled linearly, the transition to the synchronization generally consists of two s...Dynamics in coupled Dufling oscillators with two coexisting symmetrical attractors is investigated. For a pair of Dufl^ng oscillators coupled linearly, the transition to the synchronization generally consists of two steps： Firstly, the two oscillators have to jump onto a same attractor, then they reach synchronization similarly to coupled monostable oscillators. The transition scenarios to the synchronization observed are strongly dependent on initial conditions.展开更多
The phenomenon of wave grouping, in which the dense waves and the sparse waves can form groups in front of the spiral tip when the spiral wave is meandering, has been reported in a chemical reaction system recently. W...The phenomenon of wave grouping, in which the dense waves and the sparse waves can form groups in front of the spiral tip when the spiral wave is meandering, has been reported in a chemical reaction system recently. We present a method to realize the phenomenon of wave grouping by applying an external field to the system. The numerical simulations are carried out on the basis of the FitzHugh-Nagumo equations.展开更多
文摘目的:探讨高髋关节中心技术全髋关节置换术(total hip arthroplasty,THA)治疗CroweⅡ、Ⅲ型发育性髋关节发育不良(developmental dysplasia of hip,DDH)并重度髋关节炎(hip osteoarthritis,HOA)的临床疗效。方法:2018年1月至2020年1月收治CroweⅡ、Ⅲ型DDH并重度HOA患者74例,37例行解剖型髋关节中心重建为对照组,其中男7例,女30例,年龄42~65(58.40±4.98)岁,身体质量指数(body mass index,BMI)18~29(23.02±2.21)kg·m^(-2)。37例行高髋关节中心技术重建为研究组,其中男5例,女32例,年龄41~65(57.31±5.42)岁,BMI 18~29(23.14±2.07)kg·m^(-2)。患者术前表现髋关节疼痛、功能及关节活动度受限、步态不稳等。比较两组围术期指标,术前及术后3、6、12个月分别评估患者髋关节功能、平衡功能及步态情况,术前及术后12个月测量双下肢长度差、旋转中心水平距离、旋转中心垂直距离、股骨偏心距。结果:术后随访12个月,研究组失访1例,对照组失访2例。研究组手术时间短于对照组,术中出血量少于对照组(P<0.05)。术后3、6个月研究组Harris评分、Berg平衡量表(Berg balance scale,BBS)评分、步速、步频、单步长大于对照组(P<0.05),术后12个月以上指标组间比较,差异无统计学意义(P>0.05);术后12个月,研究组旋转中心垂直距离大于对照组(P<0.05),两组双下肢长度差、旋转中心水平距离、股骨偏心距比较,差异无统计学意义(P>0.05);两组均未出现并发症。结论:两种髋关节中心重建方式应用于DDH并重度HOA患者THA远期效果相当,安全性良好,且高髋关节中心技术重建可缩短手术时间,减少术中出血量,同时在早期恢复患者髋关节功能、平衡功能及步行功能方面具有一定优势。
基金Supported by the National Natural Science Foundation of China under Grant No 10405004.
文摘We employ several simple numerical experiments to show that the statements that short mean path length or low heterogeneity enhances synchronizability in complex networks could be misleading. Furthermore, we point out that the impacts of the structural parameters on the synchronizability are complicated even if we could change one structural parameter independently.
基金Supported by the National Natural Science Foundation of China under Grant No 10405004.
文摘The spiral waves in a system of two-dimensional coupled oscillators with spatial period-2 structure are investigated. We find a sandwiched spiral wave where any adjacent oscillators are in anti-phase. We show that the propagation rate of the sandwiched spiral wave is insensitive to the change of the coupling constant. The influences of the local kinetics on the sandwiched spiral wave are also investigated.
基金Supported by the New Century Excellent Talent Project of the Ministry of Education of China under Grant No NECT-07-0112 and THE National Natural Science Foundation of China under Grant No 10775022.
文摘The forced Duffing oscillator has a pair of symmetrical attractors in a proper parameter regime. When a lot of Duffing oscillators are coupled linearly, the system tends to form dusters in which the neighboring oscillators fall onto the same attractor. When the coupling strength is strong, all of the oscillators fall onto one attractor. In this work, we investigate coalescence in the coupled forced Duffing oscillators. Some phenomena are found and explanations are presented.
基金Project supported by the National Natural Science Foundation of China （Grant Nos 10575016, 10405004 and 70431002）.
文摘The dynamics of coupled Lorenz circuits is investigated experimentally. The partial amplitude death reported in Phys. Rev. E 72, 057201（2005） is verified by physical experiments with electronic circuits. With the increase of coupling constant, the coupled circuits undergo the transition from the breakdown of both the reflection symmetry and the translational symmetry to the partial amplitude death. Its stability is also confirmed by analysing the effects of noise.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.10875011 and 11075016)the 973 Project(Grant No.2007CB814805)+1 种基金the Fundamental Research Funds for the Central Universitiesthe Foundation for Doctoral Training from the Ministry of Education of China
文摘Dynamics of a one-dimensional array of non-locally coupled Kuramoto phase oscillators with an external potential is studied. A four-cluster chimera state is observed for the moderate strength of the external potential. Different from the clustered chimera states studied before, the instantaneous frequencies of the oscillators in a synchronized cluster are different in the presence of the external potential. As the strength of the external potential increases, a bifurcation from the two-cluster chimera state to the four-cluster chimera states can be found. These phenomena are well predicted analytically with the help of the Ott-Antonsen ansatz.
基金Supported by the National Natural Science Foundation of China under Grant No 71301012
文摘We investigate the collective dynamics of network-organized identical excitable nodes. We theoretically analyze the stability of the rest state and propose that there are two different transition paths： the stationary path and the oscillatory path. We find that, although the onset of collective dynamics strongly depend on the network topology, the local dynamics and how local nodes interact with each other decide the transition path and the involved bifurcation.
基金Supported by the New Century Excellent Talent Project （NCET） of the Ministry of Education of China under Grant No 07-0112, and National Natural Science Foundation of China under Grant No 10775022.
文摘Dynamics in coupled Dufling oscillators with two coexisting symmetrical attractors is investigated. For a pair of Dufl^ng oscillators coupled linearly, the transition to the synchronization generally consists of two steps： Firstly, the two oscillators have to jump onto a same attractor, then they reach synchronization similarly to coupled monostable oscillators. The transition scenarios to the synchronization observed are strongly dependent on initial conditions.
基金Supported by the National Natural Science Foundation of China under Grant No 10405004.
文摘The phenomenon of wave grouping, in which the dense waves and the sparse waves can form groups in front of the spiral tip when the spiral wave is meandering, has been reported in a chemical reaction system recently. We present a method to realize the phenomenon of wave grouping by applying an external field to the system. The numerical simulations are carried out on the basis of the FitzHugh-Nagumo equations.
