We theoretically investigate a device consisting of two quantum dots （QDs） side-coupled to a quantum wire which has many physical ingredients of an artificial heavy fermion system. An extra parameter, the distance L...We theoretically investigate a device consisting of two quantum dots （QDs） side-coupled to a quantum wire which has many physical ingredients of an artificial heavy fermion system. An extra parameter, the distance L between the two QDs, is introduced and it plays an important role on the competition of the Kondo temperature and magnetic coupling. Three different phases are found： antiferromagnetic phase, Kondo phase with spin S = 1/2, and Kondo phase with S = 1, depending on the distance L, the magnetic properties are qualitatively different for different phases： conductance tends to the unitary value 2e2 /h; for the S ： the distance. coupling, and the Kondo temperature. Quantum transport for the S = 1 Kondo and the antiferromagnetic phases, the 1/2 Kondo phase the conductance is strongly dependent onthe distance.展开更多
Objective: To evaluate the efficacy of Cotrel-Dubeusset （CD） instrumentation combined with translaminar facet joint screw （TLS） in the treatment of thoracolumbar fracture.Methods: A total of six L2-L4 spines were ...Objective: To evaluate the efficacy of Cotrel-Dubeusset （CD） instrumentation combined with translaminar facet joint screw （TLS） in the treatment of thoracolumbar fracture.Methods: A total of six L2-L4 spines were used to establish unstable fracture model with three-dimensional range of motion （ROM） of the spines measured. Fixation with CD and fixation with CD combined with translaminar facet joint screw were achieved to compare their stability. Thirty cases of thoracolumbar fracture, in whom the anterior edge of vertebral body was compressed to 59% and the posterior edge compressed to 88%, were treated by pedicle screw fixation combined with TLS. Among them, 19 received posterolateral or anterior-posterior bone graftingResults: There was significant difference in ROM between the two techniques except that in extension. In Group CD+TLS, ROM was （5.38）% lower, lateral bending （4.91）% lower and axial rotation （11.85）% lower than those in Group CD respectively. In the clinical group, the average anterior edge restored to 97% and posterior edge to 98%. The duration of follow-up was 5-24 months （mean, 10 months）. The rate of correction loss on the anterior edge was （4.5）%. Among the 19 cases of bone grafting, all of them achieved bony fusion （mean fusion time, （4.3） month） with a correction loss rate of （3.4）%.Conclusions: In the treatment of thoracolumbar fracture, pedicle screw fixation combined with TLS can strengthen the stability of pedicle screws, especially anti-rotation stability and enhance fusion rate and reduce correction loss.展开更多
基金supported by National Science Foundation of China under Grant Nos.10974236 and 11074174
文摘We theoretically investigate a device consisting of two quantum dots （QDs） side-coupled to a quantum wire which has many physical ingredients of an artificial heavy fermion system. An extra parameter, the distance L between the two QDs, is introduced and it plays an important role on the competition of the Kondo temperature and magnetic coupling. Three different phases are found： antiferromagnetic phase, Kondo phase with spin S = 1/2, and Kondo phase with S = 1, depending on the distance L, the magnetic properties are qualitatively different for different phases： conductance tends to the unitary value 2e2 /h; for the S ： the distance. coupling, and the Kondo temperature. Quantum transport for the S = 1 Kondo and the antiferromagnetic phases, the 1/2 Kondo phase the conductance is strongly dependent onthe distance.
文摘Objective: To evaluate the efficacy of Cotrel-Dubeusset （CD） instrumentation combined with translaminar facet joint screw （TLS） in the treatment of thoracolumbar fracture.Methods: A total of six L2-L4 spines were used to establish unstable fracture model with three-dimensional range of motion （ROM） of the spines measured. Fixation with CD and fixation with CD combined with translaminar facet joint screw were achieved to compare their stability. Thirty cases of thoracolumbar fracture, in whom the anterior edge of vertebral body was compressed to 59% and the posterior edge compressed to 88%, were treated by pedicle screw fixation combined with TLS. Among them, 19 received posterolateral or anterior-posterior bone graftingResults: There was significant difference in ROM between the two techniques except that in extension. In Group CD+TLS, ROM was （5.38）% lower, lateral bending （4.91）% lower and axial rotation （11.85）% lower than those in Group CD respectively. In the clinical group, the average anterior edge restored to 97% and posterior edge to 98%. The duration of follow-up was 5-24 months （mean, 10 months）. The rate of correction loss on the anterior edge was （4.5）%. Among the 19 cases of bone grafting, all of them achieved bony fusion （mean fusion time, （4.3） month） with a correction loss rate of （3.4）%.Conclusions: In the treatment of thoracolumbar fracture, pedicle screw fixation combined with TLS can strengthen the stability of pedicle screws, especially anti-rotation stability and enhance fusion rate and reduce correction loss.
