The effect of nanosecond pulsed dielectric barrier discharge(NS-DBD) plasma flow separation control is closely related to the actuation frequency,because it involves the interaction between plasma-induced vortexes and...The effect of nanosecond pulsed dielectric barrier discharge(NS-DBD) plasma flow separation control is closely related to the actuation frequency,because it involves the interaction between plasma-induced vortexes and separated flow.In order to study the mechanism of NS-DBD plasma flow separation control over a swept wing,especially the influence of the actuation frequency,at first,experimental studies of the actuation frequencies at 100 Hz are conducted to validate the numerical simulation method.Then,numerical studies of different actuation frequencies which are 50 Hz,100 Hz,160 Hz,200 Hz,500 Hz,and 1000 Hz,respectively are conducted.The interaction between the plasma-induced vortexes and the separated flow is analyzed.Results show that there is a range of the actuation frequency which includes the frequency(160 Hz) calculated by the average aerodynamic chord length to make the control effect good,but when the actuation frequencies are too low(50 Hz) or too high(1000 Hz),the control effect will get worse.The former is because plasmainduced vortexes disappear in a period within an actuation cycle;the latter is because plasma-induced vortexes cannot develop completely,resulting in a weak vortex intensity.展开更多
目的探讨国际功能、残疾与健康分类(Intemational Classification of Functioning,Disability and Health,ICF)康复理论框架与方法论引入脑卒中‘饴未病"体系后,脑卒中偏瘫患者肢体功能障碍和心理障碍等临床改善效果。方法纳入&qu...目的探讨国际功能、残疾与健康分类(Intemational Classification of Functioning,Disability and Health,ICF)康复理论框架与方法论引入脑卒中‘饴未病"体系后,脑卒中偏瘫患者肢体功能障碍和心理障碍等临床改善效果。方法纳入"治未病"体系的患者60例,随机分为ICF应用与观察组(观察组)及常规康复对照组(对照组),每组30例。对照组仅行基础康复训练;观察组除进行与对照组相同的基础康复训练外,还采用ICF分类框架下的脑卒中"治未病"预防保健服务记录,每周制定调整中医、西医治疗宣教计划和家庭保健措施。2组治疗均5次/周,4周为1疗程,共2疗程。观察各组患者入院时及治疗前后的运动功能及心理功能。运动能力采用FMA评分(Fugl-Meyer assessment scale,FMA)评定,心理状况及生存质量分别采用汉密尔顿量表(Hamilton depression scale,HAMD)及生活满意感量表(satisfaction with life scale,SWLS)评定,并对评定结果进行比较与分析。结果 2组一般基线情况具有可比性,2组治疗前各项评分差异没有统计学意义;各组治疗前后FMA、HAMD及SWLS评分比较差异明显(均P<0.05),2组治疗后FMA、HAMD及SWLS评分比较均有显著差异(均P<0.05)。结论 ICF康复理论与方法纳入脑卒中"治未病"体系可有效改善患者偏瘫功能障碍、心理及生存质量。展开更多
基金National Science and Technology Major Project (No.J2019-Ⅱ-0014-0035)Academician Workstation Foundation of the Green Aerotechnics Research Institute of Chonging Jiaotong University (No. GATRI2020C06003)。
文摘The effect of nanosecond pulsed dielectric barrier discharge(NS-DBD) plasma flow separation control is closely related to the actuation frequency,because it involves the interaction between plasma-induced vortexes and separated flow.In order to study the mechanism of NS-DBD plasma flow separation control over a swept wing,especially the influence of the actuation frequency,at first,experimental studies of the actuation frequencies at 100 Hz are conducted to validate the numerical simulation method.Then,numerical studies of different actuation frequencies which are 50 Hz,100 Hz,160 Hz,200 Hz,500 Hz,and 1000 Hz,respectively are conducted.The interaction between the plasma-induced vortexes and the separated flow is analyzed.Results show that there is a range of the actuation frequency which includes the frequency(160 Hz) calculated by the average aerodynamic chord length to make the control effect good,but when the actuation frequencies are too low(50 Hz) or too high(1000 Hz),the control effect will get worse.The former is because plasmainduced vortexes disappear in a period within an actuation cycle;the latter is because plasma-induced vortexes cannot develop completely,resulting in a weak vortex intensity.
文摘目的探讨重复行体外冲击波碎石术(extracorporeal shock wave lithotripsy,ESWL)治疗肾结石、输尿管结石的疗效及相关并发症情况。方法选取蚌埠医学院第一附属医院2010—2015年间采用ESWL治疗肾结石、输尿管结石208例患者进行回顾性分析,其中肾结石128例,输尿管上段结石80例,结石直径介于0.6~2.5 cm之间。于碎石治疗2周后,给予肾脏、输尿管、膀胱平片(plain film of kidney-ureter-bladder,KUB)及彩超复查,对碎石效果差的病例及时进行重复ESWL治疗,并根据患者情况,给予相应的治疗措施,促进结石的排出。同时观察患者重复碎石后并发症情况并总结并发症的预防和处理方法。结果重复ESWL对首次碎石失败的病例具有良好的疗效:肾结石组104例(81.2%)成功排石;输尿管结石组58例(72.5%)成功排石。重复ESWL同样存在感染、严重血尿、肾绞痛、输尿管石街形成等并发症风险。根据个体化情况选择诸如特殊体位排石、钙离子拮抗剂、α-1受体阻滞剂、抗感染、调解尿液p H值、双J管置入术等治疗和干预方法,能够应对和减少严重并发症的发生。结论首次ESWL后2周复诊,对碎石效果差的患者进行重复ESWL,可以提高第1个排石期的结石排出率。对重复ESWL,应严格掌握适应症,配合个性化的辅助措施,减少重复ESWL次数,采取措施预防和处理并发症,提高其安全性、有效性,缩短结石排出时间,加快结石排出,减少肾功能损害。重复ESWL可以提高结石排出率,并不增加并发症的发生率,值得临床推广应用。
文摘目的探讨国际功能、残疾与健康分类(Intemational Classification of Functioning,Disability and Health,ICF)康复理论框架与方法论引入脑卒中‘饴未病"体系后,脑卒中偏瘫患者肢体功能障碍和心理障碍等临床改善效果。方法纳入"治未病"体系的患者60例,随机分为ICF应用与观察组(观察组)及常规康复对照组(对照组),每组30例。对照组仅行基础康复训练;观察组除进行与对照组相同的基础康复训练外,还采用ICF分类框架下的脑卒中"治未病"预防保健服务记录,每周制定调整中医、西医治疗宣教计划和家庭保健措施。2组治疗均5次/周,4周为1疗程,共2疗程。观察各组患者入院时及治疗前后的运动功能及心理功能。运动能力采用FMA评分(Fugl-Meyer assessment scale,FMA)评定,心理状况及生存质量分别采用汉密尔顿量表(Hamilton depression scale,HAMD)及生活满意感量表(satisfaction with life scale,SWLS)评定,并对评定结果进行比较与分析。结果 2组一般基线情况具有可比性,2组治疗前各项评分差异没有统计学意义;各组治疗前后FMA、HAMD及SWLS评分比较差异明显(均P<0.05),2组治疗后FMA、HAMD及SWLS评分比较均有显著差异(均P<0.05)。结论 ICF康复理论与方法纳入脑卒中"治未病"体系可有效改善患者偏瘫功能障碍、心理及生存质量。
