The application of dry-type on-board traction transformers(D-OBTTs)aims to achieve lightweight electric multiple units(EMUs)and support the approach for carbon neutrality.However,the production of large capacity D-OBT...The application of dry-type on-board traction transformers(D-OBTTs)aims to achieve lightweight electric multiple units(EMUs)and support the approach for carbon neutrality.However,the production of large capacity D-OBTTs are limited due to the defects in insulation materials under the impact of short-circuit electromagnetic force.This paper is dedicated to enhancing the mechanical performance of the high-capacity D-OBTT under the influence of short-circuit electromagnetic force.It establishes and validates an electromagnetic force coupling model,while also analysing how the traditional structure leads to defects in the insulation material.To satisfy the requirements of safe and stable operation during the service life of the large capacity D-OBTT and minimise the weight,this paper proposes a comprehensive improvement of the mechanical performance under short-circuit electromagnetic force through material modification and structural optimisation.The improvement effect is verified through experiments and simulations.After comprehensive improvement,the tensile strength of the insulation material is 43%higher than the maximum principal stress on the contact surface of the insulation material,which meets the standard requirement and ensures long-term safe and stable operation of the D-OBTT during its service life.展开更多
Objective: To observe the therapeutic effect of combined cervical traction and electroacupuncture (EA) on Cervical Spondylopathy of Nerve Root Type (CSNRT). Methods: 145 patients diagnosed as CSNRT were randomized int...Objective: To observe the therapeutic effect of combined cervical traction and electroacupuncture (EA) on Cervical Spondylopathy of Nerve Root Type (CSNRT). Methods: 145 patients diagnosed as CSNRT were randomized into 3 groups: combined treatment group, EA group, and cervical traction (CT) group. The combined group was treated with traction followed by EA of Dazhui (大椎 GV 14), Fengchi (风池 GB 20), cervical Jiaji (夹脊 EX-B 2), etc.. Patients of two control groups were only treated by either CT or EA. Results: The markedly-effective rate and total effective rate were 76.0% and 94.0% respectively in the combined treatment group, 62.5% and 81.25% respectively in CT group, and 63.82% and 82.97% respectively in EA group. The therapeutic effect of the combined treatment group was significantly superior to that of two control groups (P<0.05). At 6-month follow-up, the above two markedly-effective and total effective rates in the combined treatment group remained 74.0% and 92.0%, still significantly higher than that in two control groups. Conclusion: Combining cervicle traction with EA treatment can effectively eliminate or relieve the symptoms and signs in patients with nerve root type cervical spondylopathy.展开更多
Purpose: To observe the therapeutic effect of acupuncture combined with traction and Qigong exercise for treatment of nerve root type cervical spondylosis. Methods: A total of 130 nerve root type cervical spondylosis ...Purpose: To observe the therapeutic effect of acupuncture combined with traction and Qigong exercise for treatment of nerve root type cervical spondylosis. Methods: A total of 130 nerve root type cervical spondylosis patients were randomly divided into acupuncture + traction + Qigong exercise (ATQE) group (n=59), acupuncture + Qigong exercise (AQE) group (n=40) and traction + Qigong exercise (TQE) group (n=31). Main acupoints used were Fengchi (GB 20) and cervical Jiaji (EX B 2) on the affected side. Results: After one month’s treatment, in ATQE, AQE and TQE groups, 43 (72.88%), 18 (45.00%) and 12 (45.16%) had remarkable amelioration, 14 (23.72%), 14 (35.00%) and 10 (32.26%) were effective, and 2 (3.39%), 8 (20.00%) and 7 (22.58%) had no apparent changes with the total effective rates being 96.61%, 80.00% and 77.41% respectively. The therapeutic effect of ATQE group was significantly superior to that of AQE and TQE groups (P<0.01).展开更多
基金supported by National Natural Science Foundation of China(Grant/Award U1834203)Natural Science Foundation of Sichuan Province(Grants/Award 2024NSFSC0020 and 2023NSFSC0828).
文摘The application of dry-type on-board traction transformers(D-OBTTs)aims to achieve lightweight electric multiple units(EMUs)and support the approach for carbon neutrality.However,the production of large capacity D-OBTTs are limited due to the defects in insulation materials under the impact of short-circuit electromagnetic force.This paper is dedicated to enhancing the mechanical performance of the high-capacity D-OBTT under the influence of short-circuit electromagnetic force.It establishes and validates an electromagnetic force coupling model,while also analysing how the traditional structure leads to defects in the insulation material.To satisfy the requirements of safe and stable operation during the service life of the large capacity D-OBTT and minimise the weight,this paper proposes a comprehensive improvement of the mechanical performance under short-circuit electromagnetic force through material modification and structural optimisation.The improvement effect is verified through experiments and simulations.After comprehensive improvement,the tensile strength of the insulation material is 43%higher than the maximum principal stress on the contact surface of the insulation material,which meets the standard requirement and ensures long-term safe and stable operation of the D-OBTT during its service life.
文摘Objective: To observe the therapeutic effect of combined cervical traction and electroacupuncture (EA) on Cervical Spondylopathy of Nerve Root Type (CSNRT). Methods: 145 patients diagnosed as CSNRT were randomized into 3 groups: combined treatment group, EA group, and cervical traction (CT) group. The combined group was treated with traction followed by EA of Dazhui (大椎 GV 14), Fengchi (风池 GB 20), cervical Jiaji (夹脊 EX-B 2), etc.. Patients of two control groups were only treated by either CT or EA. Results: The markedly-effective rate and total effective rate were 76.0% and 94.0% respectively in the combined treatment group, 62.5% and 81.25% respectively in CT group, and 63.82% and 82.97% respectively in EA group. The therapeutic effect of the combined treatment group was significantly superior to that of two control groups (P<0.05). At 6-month follow-up, the above two markedly-effective and total effective rates in the combined treatment group remained 74.0% and 92.0%, still significantly higher than that in two control groups. Conclusion: Combining cervicle traction with EA treatment can effectively eliminate or relieve the symptoms and signs in patients with nerve root type cervical spondylopathy.
文摘Purpose: To observe the therapeutic effect of acupuncture combined with traction and Qigong exercise for treatment of nerve root type cervical spondylosis. Methods: A total of 130 nerve root type cervical spondylosis patients were randomly divided into acupuncture + traction + Qigong exercise (ATQE) group (n=59), acupuncture + Qigong exercise (AQE) group (n=40) and traction + Qigong exercise (TQE) group (n=31). Main acupoints used were Fengchi (GB 20) and cervical Jiaji (EX B 2) on the affected side. Results: After one month’s treatment, in ATQE, AQE and TQE groups, 43 (72.88%), 18 (45.00%) and 12 (45.16%) had remarkable amelioration, 14 (23.72%), 14 (35.00%) and 10 (32.26%) were effective, and 2 (3.39%), 8 (20.00%) and 7 (22.58%) had no apparent changes with the total effective rates being 96.61%, 80.00% and 77.41% respectively. The therapeutic effect of ATQE group was significantly superior to that of AQE and TQE groups (P<0.01).
