三种螺距对种植体初期稳定性影响的有限元研究

目的：利用即刻负载有限元模型,研究种植体不同螺纹螺距因素对初期稳定性的影响。方法：利用Pro／E软件、Hypermesh软件及ABAQUS有限元软件,建立四类种植体即刻负载的三维有限元模型,比较3种螺纹螺距（0．8mm、1．6mm、2．4mm）在分别垂直和水平加载时,对种植体初期稳定性的影响。结果：对不同螺纹螺距种植体来说,垂直加载和水平加载时0．8mm螺距螺纹种植体微动最小,2．4mm螺距螺纹种植体微动最大。结论：螺纹的螺距对垂直相对位移有影响,对水平相对位移影响不大。随着螺距的增加,种植体对抗垂直向载荷的抵抗力减弱。水平加载时,螺纹的螺距对颈部微动影响不明显。     

中医药院校工程制图课程教学改革与实践

工程制图是一门实践性很强的技术课。探讨在学时少的情况下,应改革工程制图课程教学方法,注重培养学生的空间构思能力,以及手工绘图、计算机绘图能力;并提出加强学生动手实践能力的几种途径。     

游戏教学法在学龄前儿童用力肺活量检查中的应用

目的 探讨游戏教学法在学龄前儿童用力肺活量检查中的应用效果.方法 选择2012年1月至2013年12月在我科肺功能室进行肺功能检查的学龄前儿童317例,随机分成两组,对照组118例,其中男82例,女36例;观察组199例,其中男133例,女66例.对照组儿童在做肺功能前由技术操作人员向患儿讲解操作规范、程序、如何用力、如何配合并演示,教导患儿用口深吸气一直到肺总量位置,然后以最快速度吹气,直到能够看见时间容积曲线显示呼气相平台之后,再用最快速度吸气至肺总量位置,然后用一张8cm×21 cm的小纸条让患儿练习直到把纸吹飞.观察组患儿采用游戏教学法,即让患儿先观看电脑画面,操作人员调出游戏软件中的蜡烛画面,一边让患儿看电脑里吹蜡烛的情景,一边做示范用力吹气,重点强调吹气时一定要用最大的力气尽量可能的长时间吹气,就像吹蜡烛一样,只有这样才能把蜡烛全部吹灭,吹灭的蜡烛越多获得的分数就越高,以奖励游戏的形式鼓励患儿进行检查.每一个患儿测定6次,每次间隔2分钟,不成功者休息20分钟再重新测试,2小时以内能完成并达到质控标准的视为成功,2小时内不能达到质控标准的视为不成功,记录患儿肺功能测定的成功率,比较两组患儿进行肺功能检查的成功率.结果 对照组118例中成功完成操作者78例,占66.1％,不成功者40例,占33.9％;观察组199例中成功者160例,占80.4％,不成功者39例,占19.6％.2组结果比较,x2值为8.096,P值为0.004,差异有显著性.结论 在学龄前儿童用力肺活量检查中,游戏教学法可以有效提高检查的成功率.     

中医诊断技能实训教学方法文献计量学研究

目的 分析目前中医诊断技能实训教学方法的研究现状,为今后中诊技能实践教学提供参考和借鉴,为更好地提高学生"四诊"技能水平提供思路.方法 利用中国知网、万方数据库和维普数据库,检索2016-2020年国内公开正式发表的有关中医诊断技能实训相关的文献,选取符合纳入标准的文章,采集提取发表年度、发表期刊、基金支持类别、教学方...     

以学生为案例望面色教学实践体会

望面色是望诊的主要内容之一,为了加强学生望面色这一诊断方法的学习效果,在征得学生同意,自愿参加的前提下,在学生中找典型面色进行真实案例教学,调动了学生学习积极性,取得了良好教学效果,实现了教学相长。     

推拿教学课堂导入方式的探讨

推拿学是中医极具特色的临床学科,教学有其特点与规律.通过总结推拿教学中常用的6种形式即课程导入、案例导入、问题导入、媒体导入、预习导入、随时导入的方式并对推拿课堂的导入进行了相应的要求,如导入需要设计、相互关联、贯穿等,对推拿教学的课堂导入的地位、作用、目的等进行了探讨,为推拿教学提供参考.     

品管圈活动对降低临床实践带教差评率的影响

目的：探讨品管圈活动对于临床实践中带教差评数的影响,全面提高教学质量。方法：成立品管圈,运用PDCA循环方法,确定＂降低临床实践中带教差评率＂为主题,逐步开展品管圈活动步骤,进行效果分析。结果：通过7个月有序的品管圈活动,使临床实践中带教差评率由改善前的68.9%降为改善后的28.7%。结论：品管圈活动对于降低临床实践中带教差评率效果显著。     

Microstructure and Electrochemical Behavior of a 3D-Printed Ti-6Al-4V Alloy

3D printing (or more formally called additive manufacturing) has the potential to revolutionize the way objects are manufactured, ranging from critical applications such as aerospace components to medical devices, making the materials stronger, lighter and more durable than those manufactured via conventional methods. While the mechanical properties of Ti-6Al-4V parts manufactured with two major 3D printing techniques: selective laser melting (SLM) and electron beam melting (EBM), have been reported, it is unknown if the corrosion resistance of the 3D-printed parts is comparable to that of the alloy made with isothermal forging (ISF). The aim of this study was to identify the corrosion resistance and mechanisms of Ti-6Al-4V alloy manufactured by SLM, EBM and ISF via electrochemical corrosion tests in 3.5% NaCl solution, focusing on the effect of microstructures. It was observed that the equiaxed α + β microstructure in the ISF-manufactured Ti-6Al-4V alloy had a superior corrosion resistance to the acicular martensitic α′ + β and lamellar α + β microstructures of the 3D-printed samples via SLM and EBM, respectively. This was mainly due to the fact that (1) a higher amount of β phase was present in the ISF-manufactured sample, and (2) the fraction of phase interfaces was lower in the equiaxed α + β microstructure than in the acicular α′ + β and lamellar α + β microstructures, leading to fewer microgalvanic cells. The lower corrosion resistance of SLM-manufactured sample was also related to the higher strain energy and lower electrochemical potential induced by the presence of martensitic twins, resulting in faster anodic dissolution and higher corrosion rate.     

中医专业七年制学生临床科研能力培养的实践与思考

在中医专业七年制学生的临床教学中,坚持并深化教育教学改革,通过规范毕业论文管理、定期举办"研究生论坛"、设立"萌芽计划"科研基金、开设专题学术讲座、培养学生科技创新意识等措施,致力于培养学生的临床科研能力,取得了显著成效。     

Contrast Enhancement of the Normal Infundibular Recess Using Heavily T2-weighted 3D FLAIR

Purpose: The purpose of the present study was to evaluate contrast enhancement of the infundibular recess in the normal state using heavily T2-weighted 3D fluid-attenuated inversion recovery (FLAIR) (HT2-FLAIR).Methods: Twenty-six patients were retrospectively recruited. We subjectively assessed overall contrast enhancement of the infundibular recess between postcontrast, 4-hour (4-h) delayed postcontrast, and precontrast HT2-FLAIR images. We also objectively conducted chronological and spatial comparisons by measuring the signal intensity (SI) ratio (SIR). Chronological comparisons were performed by comparing SI of the infundibular recess/SI of the midbrain (SIR_IR-MB). Spatial comparisons were conducted by comparing SI on postcontrast HT2-FLAIR/SI on precontrast HT2-FLAIR (SIR_Post-Pre) of the infundibular recess with that of other cerebrospinal fluid (CSF) spaces, including the superior part of the third ventricle, lateral ventricles, fourth ventricle, and interpeduncular cistern.Results: In the subjective analysis, all cases showed contrast enhancement of the infundibular recess on both postcontrast and 4-h delayed postcontrast HT2-FLAIR, and showed weaker contrast enhancement of the infundibular recess on 4-h delayed postcontrast HT2-FLAIR than on postcontrast HT2-FLAIR. In the objective analysis, SIR_IR-MB was the highest on postcontrast images, followed by 4-h delayed postcontrast images. SIR_Post-Pre was significantly higher in the infundibular recess than in the other CSF spaces.Conclusion: The present results demonstrated that the infundibular recess was enhanced on HT2-FLAIR after an intravenous gadolinium injection. The infundibular recess may be a potential source of the leakage of intravenously administered gadolinium into the CSF.