具有楔形间隙的圆筒式磁流变液离合器传动性能研究

针对传统的圆筒式磁流变液传动装置存在轴向长度过长且传递转矩较小的问题,提出一种具有楔形间隙的圆筒式磁流变液离合器。运用有限元法对装置进行磁场仿真,在相同输入电流下,分析不同截面下不同间隙厚度的磁场分布,得出磁流变液的剪切屈服应力。根据传动装置的结构特点和Bingham模型理论,基于计算流体动力学对楔形间隙内流场的速度、压力、黏度及剪切应力分布进行分析,得到传递转矩随结构和转速的变化。研究结果表明,磁流变液间隙差越大,该楔形间隙提供的转矩越大;同时,磁流变液在挤压强化后,剪切屈服应力显著增加;在磁感应强度为0.55 T,初始屈服应力为30 kPa的条件下,同转速60 rad/s下相较于传统圆筒式磁流变液离合器,传递转矩提升了约1.12倍。

Growth and Reproduction of Artificially Fed Cnaphalocrocis medinalis

The growth and reproduction of rice leaffolder,Cnaphalocrocis medinalis,fed on an artificial diet were studied.The results showed that the larvae were able to grow and pupate on the artificial diet.The durations of larvae and pupas of C.medinalis on the artificial diet were 28.1 d and 10.1 d,postponed 4.9 d and 1.7 d respectively,compared with those reared with rice leaves.The number of ovipositions was 41.6 per female,26.2% higher than that fed on rice leaves.Survival rate curve of larvae was a descent function of mortality-age,with no significant differences from the curve of larvae fed on rice leaves.The net reproductive rate （Ro）,intrinsic rate of increase （rm） and finite rate of increase （λ） of the population fed on diet were 17.6928,0.0884 and 1.0924,respectively,and the mean generation time （T） and double time （td） were prolonged 4.9 d and 1.3 d in comparison with the treatment of rice leaves.Population trend index （I） was 3.26,indicating a growing number of the population of C.medinalis fed on artificial diet.

三联疗法联合瑞巴派特治疗消化性胃溃疡的临床研究

目的:探讨瑞巴派特治疗消化性胃溃疡的效果。方法:本次研究对象为我院2020年2月至2021年3月期间收治的80例消化性胃溃疡患者中选取,将其随机分为对照组和观察组(各40例)。对照组采用三联疗法,观察组在对照组基础上加用瑞巴派特。比较两组临床症状缓解时间,治疗前后胃黏膜形态学评分及胃黏膜形态学评分血沉降(Erythrocyte sedimentation rate,ESR)、降钙素原(procalcitonin,PCT)、C-反应蛋白(C-reactive protein,CRP)水平变化情况。结果:观察组临床症状缓解的时间均对于对照组;治疗后,两组患者黏膜厚度偏离正常程度、腺体密度、活动性炎症细胞浸润程度及慢性炎症细胞浸润评分均降低,且观察组低于对照组(P<0.05);治疗后两组ESR、PCT、CRP水平均降低,且观察组低于对照组(P<0.05)。结论:瑞巴派特联合三联疗法治疗消化性胃溃疡可缓解患者临床症状,改善胃黏膜形态,减轻炎症反应,加快修复胃黏膜损伤。