Although several surgical procedures exist for treating cubital tunnel syndrome, the best surgical option remains controversial. To evaluate the efficacy of anterior subcutaneous transposition of the ulnar nerve in pa...Although several surgical procedures exist for treating cubital tunnel syndrome, the best surgical option remains controversial. To evaluate the efficacy of anterior subcutaneous transposition of the ulnar nerve in patients with moderate to severe cubital tunnel syndrome and to analyze prognostic factors, we retrospectively reviewed 62 patients（65 elbows） diagnosed with cubital tunnel syndrome who underwent anterior subcutaneous transposition. Preoperatively, the initial severity of the disease was evaluated using the Mc Gowan scale as modified by Goldberg： 18 patients（28%） had grade IIA neuropathy, 20（31%） had grade IIB, and 27（42%） had grade III. Postoperatively, according to the Wilson ＆ Krout criteria, treatment outcomes were excellent in 38 patients（58%）, good in 16（25%）, fair in 7（11%）, and poor in 4（6%）, with an excellent and good rate of 83%. A negative correlation was found between the preoperative Mc Gowan grade and the postoperative Wilson ＆ Krout score. The patients having fair and poor treatment outcomes had more advanced age, lower nerve conduction velocity, and lower action potential amplitude compared with those having excellent and good treatment outcomes. These results suggest that anterior subcutaneous transposition of the ulnar nerve is effective and safe for the treatment of moderate to severe cubital tunnel syndrome, and initial severity, advancing age, and electrophysiological parameters can affect treatment outcome.展开更多
The minimum fluidization velocity is a pivotal parameter in the study of fluidization behavior within air dense medium fluidized beds,significantly affecting the design and operational efficiency of these systems.This...The minimum fluidization velocity is a pivotal parameter in the study of fluidization behavior within air dense medium fluidized beds,significantly affecting the design and operational efficiency of these systems.This research explores the fluidization characteristics of Geldart A magnetite particles and Geldart B magnetite powder particles through experimental investigations.The results show that the minimum fluidization velocity of Geldart A and Geldart B particles differs due to both particle size and density.Operating conditions,such as gas distribution uniformity and flow rate fluctuations,also have a significant impact.These findings offer valuable guidance for improving the design and operation of fluidized bed reactors.To accurately estimate the minimum fluidization velocity of Geldart A magnetite powder particles,this study extends classical equations and introduces new correlation coefficients.A summarized and analytical comparison of literature data and experimental results data demonstrate that the proposed correlation coefficients are both accurate and reliable within the defined range,with a prediction error of less than 0.2 cm/s when validated against literature and experimental data.This study furnishes experimental evidence and theoretical insights into the fluidization behavior of diverse particle types,thereby facilitating the optimization of fluidized bed design.展开更多
基金supported by grants from the National Program on Key Basic Research Project of China(973 Program),No.2014CB542200a grant from Innovation Program of Ministry of Education,No.IRT1201+1 种基金the National Natural Science Foundation of China,No.31271284,31171150,81171146,30971526,31100860,31040043,31371210Program for New Century Excellent Talents in University of Ministry of Education of China,No.BMU20110270
文摘Although several surgical procedures exist for treating cubital tunnel syndrome, the best surgical option remains controversial. To evaluate the efficacy of anterior subcutaneous transposition of the ulnar nerve in patients with moderate to severe cubital tunnel syndrome and to analyze prognostic factors, we retrospectively reviewed 62 patients（65 elbows） diagnosed with cubital tunnel syndrome who underwent anterior subcutaneous transposition. Preoperatively, the initial severity of the disease was evaluated using the Mc Gowan scale as modified by Goldberg： 18 patients（28%） had grade IIA neuropathy, 20（31%） had grade IIB, and 27（42%） had grade III. Postoperatively, according to the Wilson ＆ Krout criteria, treatment outcomes were excellent in 38 patients（58%）, good in 16（25%）, fair in 7（11%）, and poor in 4（6%）, with an excellent and good rate of 83%. A negative correlation was found between the preoperative Mc Gowan grade and the postoperative Wilson ＆ Krout score. The patients having fair and poor treatment outcomes had more advanced age, lower nerve conduction velocity, and lower action potential amplitude compared with those having excellent and good treatment outcomes. These results suggest that anterior subcutaneous transposition of the ulnar nerve is effective and safe for the treatment of moderate to severe cubital tunnel syndrome, and initial severity, advancing age, and electrophysiological parameters can affect treatment outcome.
基金supported by China National Funds for Distinguished Young Scientists(grant No.52125403)National Natural Science Foundation of China(grant Nos.52220105008,52261135540)+2 种基金the Graduate Innovation Program of China University of Mining and Technology(grant No.2023WLKXJ065)the Fundamental Research Funds for the Central Universities(grant No.2023XSCX020)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(grant No.KYCX23_2815).
文摘The minimum fluidization velocity is a pivotal parameter in the study of fluidization behavior within air dense medium fluidized beds,significantly affecting the design and operational efficiency of these systems.This research explores the fluidization characteristics of Geldart A magnetite particles and Geldart B magnetite powder particles through experimental investigations.The results show that the minimum fluidization velocity of Geldart A and Geldart B particles differs due to both particle size and density.Operating conditions,such as gas distribution uniformity and flow rate fluctuations,also have a significant impact.These findings offer valuable guidance for improving the design and operation of fluidized bed reactors.To accurately estimate the minimum fluidization velocity of Geldart A magnetite powder particles,this study extends classical equations and introduces new correlation coefficients.A summarized and analytical comparison of literature data and experimental results data demonstrate that the proposed correlation coefficients are both accurate and reliable within the defined range,with a prediction error of less than 0.2 cm/s when validated against literature and experimental data.This study furnishes experimental evidence and theoretical insights into the fluidization behavior of diverse particle types,thereby facilitating the optimization of fluidized bed design.
