对旋轴流通风机流场预测及两级电机功率匹配研究

对旋风机是矿井通风系统的重要组成部分，其安全稳定的运行是煤矿工人生命安全的保障。针对在长距离送风状态下，对旋风机风量显著减小、前后两级电机功率匹配难度加大的问题，依据流体动力学原理(Computational Fluid Dynamics，CFD)，采用对旋风机全域流体场数值模拟方法，对两级对旋叶轮性能与两级电动机性能的“线(点对点)”匹配进行研究。仿真结果揭示了对旋轴流通风机流场内部气流的真实流动规律以及两级电机轴功率匹配情况。将数值模拟结果和实验数据进行对比，验证该数值模拟方法的准确性，同时验证通过改变叶片安装角提高风机运行效率的可行性，为高性能对旋风机调速控制和节能控制提供理论依据。     

YouTube as a source of medical information on the novel coronavirus 2019 disease (COVID-19) pandemic

ABSTRACT

Media coverage on coronavirus disease 2019 (COVID-19) has been extensive, yet large gaps remain in our understanding of the role of social media platforms during worldwide health crisis. The purpose of this study was to assess the most viewed YouTube videos on COVID-19 for medical content. We coded video characteristics, source, and medical content of the 113 most-widely viewed videos about COVID-19. Seventy-nine (69.9%) videos were classified as useful, and 10 (8.8%) videos were classified as misleading. Independent users were more likely to post misleading videos than useful videos (60.0% vs 21.5%, P?=?0.009). News agencies were more likely to post useful videos than misleading videos (72.2% vs 40.0%, P?=?0.039). Useful videos were more likely to present any information on prevalence or incidence (79.7% vs 20.0%, P?<?0.001), as well as information on outcomes or prognosis (84.8% vs 30.0%, P?<?0.001) compared to misleading videos. The World Health Organization contributed one useful video (1.3%), while no videos from the Center for Disease Control were included. Although YouTube generally is a useful source of medical information on the COVID-19 pandemic, increased efforts to disseminate accurate information from reputable sources is desired to help mitigate disease spread and decrease unnecessary panic in the general population.     

脑血管疾病后Holmes震颤的临床、影像和电生理特点

目的 总结脑血管疾病后Holmes震颤的临床、影像和电生理特点。 方法 回顾性分析2015年8月-2019年8月就诊于首都医科大学附属北京天坛医院的4例脑血管疾病 所致Holmes震颤患者，对其临床、影像及电生理资料进行分析总结。 结果 4例患者中2例由高血压性脑出血引起，另外2例分别由脑动静脉畸形和脑海绵状血管瘤破裂 出血引起。Holmes震颤出现于原发病后1～24个月，表现为病灶对侧肢体震颤，以上肢多见。头颅MRI 检查显示2例患者病灶仅累及丘脑，2例同时累及丘脑和中脑。震颤分析显示静止、姿势、意向及持物 1000 g几种状态下震颤的峰频率均在2.6～3.8 Hz，意向状态震颤半宽功率高于静止状态。主动肌与 拮抗肌在静息时以同步收缩为主，姿势、意向和持物时以交替收缩为主。3例接受普拉克索治疗均有 不同程度缓解。 结论 Holmes震颤多由累及中脑、丘脑部位脑血管疾病引起，表现为2～4 Hz低频震颤，意向状态震 颤明显，部分患者多巴胺受体激动剂治疗有效。     

ROCCIPI技术框架下智慧医院建设的问题识别及分析

建设智慧医院旨在以患者为中心,通过智慧化途径向患者提供便捷化、个性化的医疗卫生服务,改善患者就医体验。文章采用ROCCIPI技术框架,就规则、机会、能力、交流、利益、过程和意识七个方面对我国医院智慧化建设进行深入分析,为现代化医院建设提供一定参考。     

Digital navigators to implement smartphone and digital tools in care

While smartphone apps and other digital health tools have the clear potential to increase both quality of and access to care, actual successful implementation remains limited. Challenges often encountered in seeking to use apps in care include selecting safe/effective tools, spending clinical time troubleshooting technology instead of discussing health matters, and lack of time to check and review constant streams of data these digital tools can produce. In this ‘From Research to Clinical Practice’ piece, we focus on how a new care team member, the digital navigator, can help overcome these barriers through conducting evidence-based app evaluation to help in selecting the right apps, troubleshooting technology outside of visits to improve the therapeutic alliance during, and finally summarizing digital data to facilitate clinical care that focus on actionable data.     

加味逍遥散联合三维适形放疗对原发性肝癌患者血清生长因子及免疫功能的影响

目的:观察加味逍遥散联合三维适形放疗对原发性肝癌(PLC)患者血清肝细胞生长因子(HGF)、转化生长因子-β1(TGF-β1)及免疫功能的影响。方法:选取90例PLC患者为研究对象,按照随机数字表法分为观察组和对照组,每组45例。对照组采用经肝动脉化疗栓塞术(TACE)联合三维适形放疗治疗,观察组在对照组基础上联合加味逍遥散治疗。对比2组中医证候疗效和实体瘤疗效,观察治疗前后血清HGF、TGF-β1及免疫功能指标的变化,记录不良反应发生情况。结果:观察组中医证候改善率97.78%,高于对照组的77.78%,差异有统计学意义(P<0.05)。观察组实体瘤疗效有效率略高于对照组,差异无统计学意义(P>0.05)。与治疗前比较,治疗后2组HGF水平均升高(P<0.05),TGF-β1水平均降低(P<0.05),观察组2项指标水平升高或降低幅度均大于对照组(P<0.05)。与治疗前比较,治疗后2组CD3^+、CD4^+、CD4^+/CD8^+、自然杀伤细胞(NK细胞)值均升高(P<0.05),观察组以上4项指标值均高于对照组(P<0.05)。2组治疗过程中均无严重不良反应发生。结论:加味逍遥散联合三维适形放疗治疗PLC可提高临床疗效,改善患者的免疫功能,调节机体血清相关因子。     

三维能量多普勒超声预测子痫前期的临床应用研究

目的探讨三维能量多普勒超声(3D-PDU)及其定量参数对预测子痫前期的应用价值。方法应用三维能量多普勒超声成像对328例11~14周进行常规超声检查的孕妇胎盘血流灌注情况进行前瞻性观察分析,应用三维多普勒直方图计算胎盘血管指数(VI)、血流指数(FI)、血管和血流指数(VFI)。所有患者在16~20周之间再进行一次检查。孕妇随访至分娩结束,按有无发生子痫前期分为正常妊娠组和子痫前期组。结果16~20周子痫前期组胎盘血管指数(VI)、血流指数(FI)、血管和血流指数(VFI)等胎盘血管指数明显低于对照组。11~14周子痫前期组胎盘血管指数与对照组差异无统计学意义。结论三维能量多普勒超声可定量分析胎盘血流灌注情况,可以预测及诊断子痫前期。