Impact of old age on clinical and angiographic characteristics of coronary artery spasm as assessed by acetylcholine provocation test

Background Smoking and other risk factors have been well known as important factors of variant angina or coronary artery spasm （CAS）. However, clinical features related to age on coronary artery spasm have been rarely evaluated. Methods We evaluated 3155 consecutive patients with insignificant coronary artery lesion. Patients underwent Acetylcholine （Ach） provocation test for induction of CAS. CAS was defined as 〉 70% luminal narrowing of coronary arteries during Ach provocation test. The results of Ach provocation test were compared among age groups; 〈 45 years （Group 1）, 45-54 years （Group 2）, 55-64 years （Group 3）, and 〉_ 65 years （Group 4）. Results Older patients had higher incidence of hypertension, diabetes, but lower incidence rate of current smoking, male sex compared with younger patients. Positive Ach provocation test finding was frequently showed with aging （47.36% vs. 58.3% vs. 62.6% vs. 61.5%; P 〈 0.001）. Multivariate logistic analysis showed that age, male, and myocardial bridge were independent predictors of CAS induced by Ach provocation test. Conclusion Our present study showed that old age was independent predictor for Ach-induced significant coronary artery spasm.

一种用于EPS系统的永磁同步电机弱磁控制的改进方法

针对目前驾驶员在快速转动方向盘时感到沉重的缺点,分析了用于电动助力转向系统的永磁同步电机弱磁控制动态性能差的原因。提出了一种基于前馈和模糊PI的综合弱磁控制方法。该方法通过弱磁控制实现了从直轴电流调节到正交轴电流调节的平滑过渡,并拓宽了前馈控制的弱磁深度。最后,通过仿真分析和硬件在环测试验证了该方法的有效性。

伴抑郁的慢性湿疹患者同型半胱氨酸水平研究

目的检测伴抑郁的慢性湿疹患者外周血中同型半胱氨酸水平(Hcy),并探讨其与疾病的相关性。方法回顾性调查2012年6月-2017年6月该院皮肤性病科门诊就诊的108慢性湿疹患者,根据PHQ-9抑郁量表评分情况分为对照组47例(不伴抑郁的慢性湿疹组)和观察组61例(伴抑郁的慢性湿疹组)。评估两组患者的一般临床资料。比较两组患者外周血Hcy及维生素B12水平,同时比较两组患者皮损面积及严重程度指数(EASI)评分及患者瘙痒评分(VAS)。采用Spearman法进行Hcy、维生素B12值与伴抑郁的慢性湿疹患者临床特征的相关性分析;并分析观察组中抑郁评分与Hcy、维生素B12值、EASI评分、VAS评分的相关性。结果两组患者的性别、年龄和病程比较,差异无统计学意义(P>0.05)。两组外周血Hcy水平和维生素B12水平比较,差异有统计学意义(P<0.05),观察组患者的外周血Hcy水平高于对照组,维生素B12水平低于对照组。但两组患者的EASI评分及VAS评分比较,差异无统计学意义(P>0.05)。通过对观察组进行Spearman相关性分析发现,Hcy水平与EASI评分、VAS评分呈正相关;维生素B12水平与EASI评分、VAS评分呈负相关(P<0.05)。而且,Hcy与维生素B12水平呈负相关(r=-0.503,P=0.000)。抑郁评分与Hcy、EASI评分及VAS评分呈正相关;与维生素B12水平呈负相关(P<0.05)。结论抑郁与慢性湿疹相互影响,Hcy可能是其机制之一。

外施励磁场作用下电工钢片的趋肤效应和涡流损耗（英文）

通过应用电磁扩散方程分析了基于麦克斯韦电磁场理论的交变激励条件下电工钢片的趋肤效应。考虑到在高频下趋肤效应更为明显,提出对扩散方程的无量纲化处理,并在考虑和不考虑趋肤效应两情况下计算涡流损耗。同时,利用三维磁性测试系统得到一种典型电工钢的宽带磁损耗和分离,来分析旋转激励下它的趋肤效应。提出了磁本构方程的简化,并将其引入扩散方程,采用有限元耦合弗雷德霍姆方程求解,最终写出具有趋肤效应的旋转涡流损耗分量的近似表达式。