光磁共振实验中干扰峰的分析及利用   总被引：1，自引：0，他引：1  

董素梅  彭跃华 《湖南科技学院学报》2008,29(4):31-33

本文分析了在光磁共振实验中用扫场法测量铷原子的因子时所产生干扰峰的形成原因,并且巧妙地利用干扰峰来计算地磁场的水平分量.  相似文献   

Switchable 2,3-dithienylmaleimide bonded to different fluorophores:synthesis and photochromic properties     

Lei XU  Zu-jin ZHAO  Ya-jun XING  Ping LU 《浙江大学学报(A卷英文版)》2008,9(11):1590-1594

A series of photochromic diarylethene derivatives containing different fluorophores was synthesized by the Sonogashira coupling reaction and characterized by ^1H nuclear magnetic resonance （NMR）, ^13C NMR and mass spectroscopy. Photochromic conversion of Cz-MS was observed and its structural change was confirmed by proton NMR, Switchable absorption and emission phenomena were observed for these molecules. These phenomena were attributed to the reversible photochromic fluorescence resonance energy transfer （pcFRET） process. The design of this novel photochromic system of Py-4MS enables information to be processed in a non-destructive manner. This overcomes the problem of the destructive nature of tracking photochromism using ultraviolet （UV）-vis spectroscopy.  相似文献   

本科生导师制的实践与思索——以医学影像技术专业为例     

林小倩  吕发金  郁仁强 《教育教学论坛》2021,(2)

为响应国家加快建设高水平本科教育,全面提高人才培养能力的号召,院系探索实施了三届的本科生导师制教学。本科生导师制是对传统本科教育模式的补充,让师生之间的沟通更为紧密,为培养高素质人才提供了一种新的途径,在大部分本科生中反响较好。但在实施本科生导师制的过程中也遇到了一些问题,文章对本科生导师制教学实践做了总结和思考,分析目前本科生导师制面临的问题,探讨解决的方案,不断完善本科生导师制。  相似文献   

案例式PBL教学在医学影像技术教学意义的探索与思考     

张小辉  张志伟  李咏梅  曾春 《教育教学论坛》2021,(2)

以问题为基础的教学模式(Problem Based Learning,PBL)是我国前期医学教育的改革方向,应用于后期临床实践教学同样具有革命性意义。医学影像技术专业学生实习采用案例式PBL教学模式,有利于加强学生的相关知识网络结构,使得学生更全面地熟悉相关影像技术的理论知识,将理论与实践相结合,提高最优化扫描技术的选择能力。  相似文献   

Cinematic Rendering in Anatomy: A Crossover Study Comparing a Novel 3D Reconstruction Technique to Conventional Computed Tomography     

Johannes S. Binder  Michael Scholz  Stephan Ellmann  Michael Uder  Robert Grützmann  Georg F. Weber  Christian Krautz 《Anatomical sciences education》2021,14(1):22-31

Integration of medical imaging into preclinical anatomy courses is already underway in many medical schools. However, interpretation of two-dimensional grayscale images is difficult and conventional volume rendering techniques provide only images of limited quality. In this regard, a more photorealistic visualization provided by Cinematic Rendering (CR) may be more suitable for anatomical education. A randomized, two-period crossover study was conducted from July to December 2018, at the University Hospital of Erlangen, Germany to compare CR and conventional computed tomography (CT) imaging for speed and comprehension of anatomy. Sixteen students were randomized into two assessment sequences. During each assessment period, participants had to answer 15 anatomy-related questions that were divided into three categories: parenchymal, musculoskeletal, and vascular anatomy. After a washout period of 14 days, assessments were crossed over to the respective second reconstruction technique. The mean interperiod differences for the time to answer differed significantly between the CR–CT sequence (−204.21 ± 156.0 seconds) and the CT–CR sequence (243.33 ± 113.83 seconds; P < 0.001). Overall time reduction by CR was 65.56%. Cinematic Rendering visualization of musculoskeletal and vascular anatomy was higher rated compared to CT visualization (P < 0.001 and P = 0.003), whereas CT visualization of parenchymal anatomy received a higher scoring than CR visualization (P < 0.001). No carryover effects were observed. A questionnaire revealed that students consider CR to be beneficial for medical education. These results suggest that CR has a potential to enhance knowledge acquisition and transfer from medical imaging data in medical education.  相似文献   

核医学肝胆显像剂IODIDA的合成研究     

苏秋芳 《茂名学院学报》1995,(2)

为合成肝胆显像剂IODIDA,以活泼芳香胺为原料,经改进的直接碘化法,选择性碘代芳香胺。在吡啶与醋酐存在下,用相应的碘代芳香胺与氮三乙酸反应,可得所需产物,产率较好。  相似文献   

基于LabView的脉冲核磁共振实验     

阙立志  倪晓武 《实验室研究与探索》2008,27(3):51-54

针对现有脉冲核磁共振实验用示波器显示和测量实验数据精度差的缺点,提出利用计算机声卡采集实验数据,用LabView软件开发实验数据采集及分析系统,具有测量精度高、操作简单、智能化分析的特点。  相似文献   

核磁共振成像技术教学实验研究     

张学龙  汪红志  杨培强  武杰 《实验室研究与探索》2008,27(12)

为了克服现有核磁共振成像实验仪不能很好地满足直观实验教学需要之不足,同时为小样品小范围测试进行科学研究提供方便,并为教学单位提供价格相对低廉的产品.利用核磁共振成像的基本原理,采用NMI20型台式核磁共振成像仪,研究如何开展核磁共振成像技术教学实验问题.开发了涉及共振频率、脉冲序列、相位编码、加权成像、射频功放等内容的26个实验.作为教学实验设备,该成像仪备具有直观的界面以及成像过程的开放性,能使学生深入掌握核磁共振的原理、结构及其硬件系统,教学效果良好.  相似文献   

磁场作用下的磁性流体行波泵研究     

赵猛  胡建辉  徐永向  邹继斌  王黎钦 《大连大学学报》2008,29(3):108-111

磁场作用下的磁性流体行波泵研究是行波泵设计的基础。通过分析了行波磁场作用下的磁性流体的运动方程,从而进一步推导了行波磁场作用下的磁性流体的速度方程、旋转速度方程和单位时间内的流量方程,并通过实验进行了验证。研究表明：行波磁场作用下的磁性流体会产生流动现象;行波磁场作用下的磁性流体流量与磁极旋转的角度有直接关系,磁极旋转的角度越大,其流量也越多;行波磁场的强弱对磁性流体流量也会产生影响,磁场越强,其流量越大;行波磁场的频率只能影响磁性流体的流速,对流量不产生任何直接影响。  相似文献   

磁性液体密封机理的研究   总被引：1，自引：0，他引：1  

赵四海  秦文艺 《大连大学学报》2008,29(3):115-118

根据悬浮液的分散团聚理论,提出了磁流变效应的机理,并推导出磁流变液屈服应力公式。根据磁流变流体的磁流变效应,推导出了磁性液体密封压力的计算公式,磁性液体的密封压力与磁性液体的屈服应力、密封结构的长度和间隙相关。采用狭缝式磁流变液流变性能测试系统,测试了现有磁性液体的屈服应力,对已有的磁流体密封装置进行了实验研究,该公式计算结果与实验结果吻合。  相似文献