采用激光-MAG(Metal active gas arc welding)复合焊接工艺,以焊缝表面成形、焊缝纵截面形貌和熔深波动程度为工艺稳定性评价依据,借助高速摄像系统和图像处理方法,对焊接过程中飞溅和等离子体两种关键过程信息进行特征识别和定量化表征...采用激光-MAG(Metal active gas arc welding)复合焊接工艺,以焊缝表面成形、焊缝纵截面形貌和熔深波动程度为工艺稳定性评价依据,借助高速摄像系统和图像处理方法,对焊接过程中飞溅和等离子体两种关键过程信息进行特征识别和定量化表征,系统地研究激光功率从5 kW提高到30 kW时,焊接过程关键特征信息与焊接过程稳定性之间的关系。结果表明,随着激光功率的增加,焊缝表面成形出现周期性“上凸-下凹”现象,焊缝内部裂纹和熔深变化特征也随之周期性变化;等离子体面积和飞溅面积均随激光功率的提高呈增加趋势,且两者波动程度和熔深波动程度均呈正相关;等离子体面积增加会导致激光传输过程中能量衰减程度的加剧,使焊缝熔深增加趋势逐渐变缓,其波动程度是影响焊接过程稳定性的关键因素之一。展开更多
目的:探讨加味身痛逐瘀汤对骨质疏松性疼痛患者的干预效应研究。方法:选取本院2017年1月—2018年12月收治的骨质疏松疼痛患者90例,随机分为对照组与观察组。对照组采用钙尔奇D片联合鲑降钙素注射液治疗,观察组在对照组基础上采用加味身...目的:探讨加味身痛逐瘀汤对骨质疏松性疼痛患者的干预效应研究。方法:选取本院2017年1月—2018年12月收治的骨质疏松疼痛患者90例,随机分为对照组与观察组。对照组采用钙尔奇D片联合鲑降钙素注射液治疗,观察组在对照组基础上采用加味身痛逐瘀汤治疗,均治疗4周。比较治疗前后两组患者腰椎骨密度(bone mineral density,BMD)与股骨BMD变化、VAS评分以及治疗总有效率。结果:治疗前,两组VAS评分、腰椎BMD、股骨BMD相当(P>0.05);治疗后,两组VAS评分均降低,观察组低于对照组(P<0.05);腰椎与股骨BMD均提高,观察组高于对照组(P<0.05);观察组治疗总有效率(95.56%)高于对照组(80.00%,P<0.05)。结论:加味身痛逐瘀汤可有效降低骨质疏松患者的疼痛感,改善患者骨密度,疗效确切,值得临床推广使用。展开更多
Aggregation-induced emission(AIE)has emerged as a new concept,giving highly efficient solid-state photoluminescence.Particularly,AIE luminogens(AIEgens)with deep blue emission(400–450 nm)have displayed salient advant...Aggregation-induced emission(AIE)has emerged as a new concept,giving highly efficient solid-state photoluminescence.Particularly,AIE luminogens(AIEgens)with deep blue emission(400–450 nm)have displayed salient advantages for non-doped organic light-emitting diodes(OLEDs).However,deep blue emitters with Commission Internationale de L’Eclairage(CIE)coordinates less than 0.08 are still rare.In this review,we outline the latest achievements in the molecular guidelines based on the AIE core of tetraphenylbenzene(TPB)for developing efficient deep blue AIEgens.We provide insights into the construction of deep blue emitters with high horizontal orientation by regulating the length of the linear molecule.We also discuss the luminescence mechanisms of these AIEgens-based OLEDs by using the magnetic field effects measurements.Finally,a summary of the challenges and perspectives of deep blue AIEgens for non-doped OLEDs is also presented.展开更多
文摘采用激光-MAG(Metal active gas arc welding)复合焊接工艺,以焊缝表面成形、焊缝纵截面形貌和熔深波动程度为工艺稳定性评价依据,借助高速摄像系统和图像处理方法,对焊接过程中飞溅和等离子体两种关键过程信息进行特征识别和定量化表征,系统地研究激光功率从5 kW提高到30 kW时,焊接过程关键特征信息与焊接过程稳定性之间的关系。结果表明,随着激光功率的增加,焊缝表面成形出现周期性“上凸-下凹”现象,焊缝内部裂纹和熔深变化特征也随之周期性变化;等离子体面积和飞溅面积均随激光功率的提高呈增加趋势,且两者波动程度和熔深波动程度均呈正相关;等离子体面积增加会导致激光传输过程中能量衰减程度的加剧,使焊缝熔深增加趋势逐渐变缓,其波动程度是影响焊接过程稳定性的关键因素之一。
文摘目的:探讨加味身痛逐瘀汤对骨质疏松性疼痛患者的干预效应研究。方法:选取本院2017年1月—2018年12月收治的骨质疏松疼痛患者90例,随机分为对照组与观察组。对照组采用钙尔奇D片联合鲑降钙素注射液治疗,观察组在对照组基础上采用加味身痛逐瘀汤治疗,均治疗4周。比较治疗前后两组患者腰椎骨密度(bone mineral density,BMD)与股骨BMD变化、VAS评分以及治疗总有效率。结果:治疗前,两组VAS评分、腰椎BMD、股骨BMD相当(P>0.05);治疗后,两组VAS评分均降低,观察组低于对照组(P<0.05);腰椎与股骨BMD均提高,观察组高于对照组(P<0.05);观察组治疗总有效率(95.56%)高于对照组(80.00%,P<0.05)。结论:加味身痛逐瘀汤可有效降低骨质疏松患者的疼痛感,改善患者骨密度,疗效确切,值得临床推广使用。
基金This work is supported by the National Natural Science Foundation of China(Nos.21788102,21525417)the Natural Science Foundation of Guangdong Province,China(Nos.2019B030301003,2016A030312002)the Innovation and Technology Commission of Hong Kong,China(No.ITC-CNERC14S01).
文摘Aggregation-induced emission(AIE)has emerged as a new concept,giving highly efficient solid-state photoluminescence.Particularly,AIE luminogens(AIEgens)with deep blue emission(400–450 nm)have displayed salient advantages for non-doped organic light-emitting diodes(OLEDs).However,deep blue emitters with Commission Internationale de L’Eclairage(CIE)coordinates less than 0.08 are still rare.In this review,we outline the latest achievements in the molecular guidelines based on the AIE core of tetraphenylbenzene(TPB)for developing efficient deep blue AIEgens.We provide insights into the construction of deep blue emitters with high horizontal orientation by regulating the length of the linear molecule.We also discuss the luminescence mechanisms of these AIEgens-based OLEDs by using the magnetic field effects measurements.Finally,a summary of the challenges and perspectives of deep blue AIEgens for non-doped OLEDs is also presented.
