目的系统评价易筋经功法锻炼对颈椎病临床疗效的影响。方法检索中文数据库(知网、万方、CBM、维普)及英文数据库(Web of Science、PubMed、Cochrane Library、Embase)中所有易筋经治疗颈椎病的相关随机对照试验,检索时间为建库至2020年1...目的系统评价易筋经功法锻炼对颈椎病临床疗效的影响。方法检索中文数据库(知网、万方、CBM、维普)及英文数据库(Web of Science、PubMed、Cochrane Library、Embase)中所有易筋经治疗颈椎病的相关随机对照试验,检索时间为建库至2020年12月31日。研究者独自筛选文献,采用Revman 5.3软件对数据进行Meta分析。结果共纳入19篇文献,1541例患者。Meta分析结果显示试验组的总有效率明显高于对照组,差异有统计学意义[RR=1.16,95%CI(1.10,1.22),P<0.00001]。结论据目前临床研究证据表明,易筋经对颈椎病的临床疗效优于其他疗法,但由于相关文献较少,文献质量不高,仍需大样本、高质量的临床研究样本加以验证。展开更多
Objective:To observe the efficacy of synchronous scalp acupuncture and rehabilitation training in the treatment of poststroke dysphagia.Methods:A total of 106 participants were divided into an observation group and a ...Objective:To observe the efficacy of synchronous scalp acupuncture and rehabilitation training in the treatment of poststroke dysphagia.Methods:A total of 106 participants were divided into an observation group and a control group using the random number table method,with 53 cases in each group.The control group was treated with scalp acupuncture in addition to conventional rehabilitation training.The observation group was treated with synchronous scalp acupuncture and conventional rehabilitation training.Water swallowing test(WST),blood oxygen-saturation change amplitude,mini-mental state examination(MMSE),and standardized swallowing assessment(SSA)were assessed before treatment,after 2 weeks of treatment,and at follow-ups at week 4 and week 6.The effective rate was calculated based on the change in the WST grading after 2 weeks of treatment.Results:After 2 weeks of treatment,there was an insignificant difference in the total effective rate between the two groups(P>0.05),but the inter-group difference in the cured plus markedly effective rate was significant(P<0.01).The intra-group differences in the WST grading,blood oxygen-saturation change amplitude,and the scores of MMSE and SSA were significant among the 4 time points in the two groups(P<0.01).At follow-up at week 6,the WST grading and SSA score in the observation group were superior to those in the control group(P<0.01).Conclusion:Both intervention protocols can improve the swallowing function,physical function,and psychological status;the observation group’s intervention is better than that of the control group in improving swallowing function.展开更多
Water-evaporation-induced electricity generation shows great application prospect due to the volt-level voltage induced by natural water evaporation in ambient environment.Increasing investigations have been conducted...Water-evaporation-induced electricity generation shows great application prospect due to the volt-level voltage induced by natural water evaporation in ambient environment.Increasing investigations have been conducted on water-evaporation-induced electricity in different materials,surface treatments,working mechanisms and wide ranges of practical applications.However,to further enhance the electricity output remains a great challenge.In this study,we fabricated porous carbon black films with isosceles trapezoid shapes to generate water-evaporation-induced electricity,in contrast with the widely used rectangle samples.We found that an isosceles trapezoid film produces two different voltages by inversing the film,because of different flow rates and capillary heights after inversion.The ratio of these voltages varies with the length of longer base when lengths of shorter base and heights are fixed,and the maximum ratio can reach 1.77:1 in our study.This work shows the importance of geometry design in improving the output voltage.展开更多
Damage tolerance of titanium alloy structures is very important for the safety of modern aircraft under complex loading and environmental conditions. However, there is no available systematic knowledge about the effec...Damage tolerance of titanium alloy structures is very important for the safety of modern aircraft under complex loading and environmental conditions. However, there is no available systematic knowledge about the effect of alloy thickness under mixed-mode loading at elevated temperatures. In the present study, a newly developed fracture experimental technique based on high-temperature moiré interferometry was employed to investigate experimentally I-II mixed-mode fracture in titanium alloy TC11 of various thicknesses at room and elevated temperatures. Compact shear specimens with thickness ranging from 1.8 to 7.1 mm were tested. The effects of temperature, thickness, and loading angle on the load capacity and crack initiation angle were investigated systematically. The TC11 alloy was shown to possess varied fracture performance at elevated tem-perature, and an opposite thickness effect at room temperature. Increasing temperature would enhance the fracture load capacity of thick specimens but reduce the fracture load capacity of thin specimens. Crack initiation angles under I-II mixed-mode loading showed the thickness-temperature coupling effects. These complex effects call for new development in three-dimensional mixed-mode fracture theory and technologies for damage tolerance assessment.展开更多
Based on molecular force fields,a new finite element model is constructed for multi-walled carbon nanotubes where the interlayer interactions and C--C bonds are simulated by the elements of piece-wise linear spring an...Based on molecular force fields,a new finite element model is constructed for multi-walled carbon nanotubes where the interlayer interactions and C--C bonds are simulated by the elements of piece-wise linear spring and rectangular cross section beam,respectively.For high computation efficiency and atomic reification,the radial breathing modes of multi-walled carbon nanotubes are studied systemically using this model.The results show the correspondence between carbon nanotube structures and vibrational modes,which provide unequivocal data for the experimental characterization of carbon nanotubes.An empirical relationship of radial breathing modes frequencies with the nanotube radius are also obtained for two-layer carbon nanotubes.展开更多
文摘目的系统评价易筋经功法锻炼对颈椎病临床疗效的影响。方法检索中文数据库(知网、万方、CBM、维普)及英文数据库(Web of Science、PubMed、Cochrane Library、Embase)中所有易筋经治疗颈椎病的相关随机对照试验,检索时间为建库至2020年12月31日。研究者独自筛选文献,采用Revman 5.3软件对数据进行Meta分析。结果共纳入19篇文献,1541例患者。Meta分析结果显示试验组的总有效率明显高于对照组,差异有统计学意义[RR=1.16,95%CI(1.10,1.22),P<0.00001]。结论据目前临床研究证据表明,易筋经对颈椎病的临床疗效优于其他疗法,但由于相关文献较少,文献质量不高,仍需大样本、高质量的临床研究样本加以验证。
文摘Objective:To observe the efficacy of synchronous scalp acupuncture and rehabilitation training in the treatment of poststroke dysphagia.Methods:A total of 106 participants were divided into an observation group and a control group using the random number table method,with 53 cases in each group.The control group was treated with scalp acupuncture in addition to conventional rehabilitation training.The observation group was treated with synchronous scalp acupuncture and conventional rehabilitation training.Water swallowing test(WST),blood oxygen-saturation change amplitude,mini-mental state examination(MMSE),and standardized swallowing assessment(SSA)were assessed before treatment,after 2 weeks of treatment,and at follow-ups at week 4 and week 6.The effective rate was calculated based on the change in the WST grading after 2 weeks of treatment.Results:After 2 weeks of treatment,there was an insignificant difference in the total effective rate between the two groups(P>0.05),but the inter-group difference in the cured plus markedly effective rate was significant(P<0.01).The intra-group differences in the WST grading,blood oxygen-saturation change amplitude,and the scores of MMSE and SSA were significant among the 4 time points in the two groups(P<0.01).At follow-up at week 6,the WST grading and SSA score in the observation group were superior to those in the control group(P<0.01).Conclusion:Both intervention protocols can improve the swallowing function,physical function,and psychological status;the observation group’s intervention is better than that of the control group in improving swallowing function.
基金the National Key Research and Development Program of China(Grant No.2019YFA0705400)the National Natural Science Foundation of China(Grant No.51535005)+2 种基金the Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures(Grant Nos.MCMS-I-0418K01 and MCMS-I-0419K01)the Fundamental Research Funds for the Central Universities(Grant Nos.NZ2020001,NC2018001,NP2019301 and NJ2019002)a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions。
文摘Water-evaporation-induced electricity generation shows great application prospect due to the volt-level voltage induced by natural water evaporation in ambient environment.Increasing investigations have been conducted on water-evaporation-induced electricity in different materials,surface treatments,working mechanisms and wide ranges of practical applications.However,to further enhance the electricity output remains a great challenge.In this study,we fabricated porous carbon black films with isosceles trapezoid shapes to generate water-evaporation-induced electricity,in contrast with the widely used rectangle samples.We found that an isosceles trapezoid film produces two different voltages by inversing the film,because of different flow rates and capillary heights after inversion.The ratio of these voltages varies with the length of longer base when lengths of shorter base and heights are fixed,and the maximum ratio can reach 1.77:1 in our study.This work shows the importance of geometry design in improving the output voltage.
基金supported by the Natural Science Foundation of Jiangxi Province of China (Grant No. 2009GZW0022)
文摘Damage tolerance of titanium alloy structures is very important for the safety of modern aircraft under complex loading and environmental conditions. However, there is no available systematic knowledge about the effect of alloy thickness under mixed-mode loading at elevated temperatures. In the present study, a newly developed fracture experimental technique based on high-temperature moiré interferometry was employed to investigate experimentally I-II mixed-mode fracture in titanium alloy TC11 of various thicknesses at room and elevated temperatures. Compact shear specimens with thickness ranging from 1.8 to 7.1 mm were tested. The effects of temperature, thickness, and loading angle on the load capacity and crack initiation angle were investigated systematically. The TC11 alloy was shown to possess varied fracture performance at elevated tem-perature, and an opposite thickness effect at room temperature. Increasing temperature would enhance the fracture load capacity of thick specimens but reduce the fracture load capacity of thin specimens. Crack initiation angles under I-II mixed-mode loading showed the thickness-temperature coupling effects. These complex effects call for new development in three-dimensional mixed-mode fracture theory and technologies for damage tolerance assessment.
基金supported by the National Natural Science Foundation of China (Grant No.10732040)the Natural Science Foundation of Jiangsu Province (Grant No.BK2010501)the Nanjing University of Aeronautics and Astronautics Research Funding (Grant Nos.4015-909322,NS2010220)
文摘Based on molecular force fields,a new finite element model is constructed for multi-walled carbon nanotubes where the interlayer interactions and C--C bonds are simulated by the elements of piece-wise linear spring and rectangular cross section beam,respectively.For high computation efficiency and atomic reification,the radial breathing modes of multi-walled carbon nanotubes are studied systemically using this model.The results show the correspondence between carbon nanotube structures and vibrational modes,which provide unequivocal data for the experimental characterization of carbon nanotubes.An empirical relationship of radial breathing modes frequencies with the nanotube radius are also obtained for two-layer carbon nanotubes.
