从记忆到想像：艺术作为摄影时代的影像转向

在传统观念下,摄影被认为是真实时空中发生的事物和活动的复制品,是现实世界的纯粹反映,而数字影像的记录方式从实体的银盐变成了虚拟的像素,通过后期再加工合成或电脑绘图制作的影像把摄影从记忆中的现实空间转化为想象中的拟像空间,解构了传统摄影的确证和记录的本质,颠覆了摄影艺术纪实美、瞬间美的本体特性,重塑了当代影像艺术的创作与审美架构,步入瓦尔特.本雅明所预示的＂艺术作为摄影＂的时代。本文从传统摄影的本体特性切入,探讨数字影像技术对新闻摄影伦理观念的冲击,摄影艺术创作方法和观念的转变等问题。     

磁共振成像技术及其应用

磁共振成像技术依据原子核能级跃迁释放能量在物质不同结构环境中不同的衰减,通过外加梯度磁场检测所发射的电磁波,获得构成物体的原子核种类和位置,从而绘制出物体内部的结构图像．近年来,随着快速变化的梯度磁场的应用,核磁共振成像技术不仅在医学,而且在其他科研领域都得到了广泛的应用．     

二次成像法凸透镜移动距离的研究与应用

二次成像法中凸透镜的移动距离是一个重要的参数,分析凸透镜的移动距离与相关变量之间的关系,并举例说明了它的应用。     

The translucent cadaver: An evaluation of the use of full body digital x-ray images and drawings in surface anatomy education

It has been noted by staff at the Faculty of Health Sciences, Stellenbosch University that medical students neglect the study of surface anatomy during dissection. This study reports on the novel use of Lodox® Statscan® images in anatomical education, particularly the teaching of surface anatomy. Full body digital X‐ray images (Lodox Statscan) of each cadaver (n = 40) were provided to second year medical students. During dissection students were asked to visualize landmarks, organs, and structures on the digital X‐ray and their cadaver, as well as palpate these landmarks and structures on themselves, their colleagues, and the cadaver. To stimulate student engagement with surface anatomy, dissection groups were required to draw both the normal and actual position of organs on a laminated image provided. The accuracy of the drawings was subsequently assessed and students were further assessed by means of practical identification tests. In addition, students were asked to complete an anonymous questionnaire. A response rate of 79% was obtained for the student questionnaire. From the questionnaire it was gathered that students found the digital X‐ray images beneficial for viewing most systems' organs, except for the pelvic organs. Although it appears that students still struggle with the study of surface anatomy, most students believed that the digital X‐rays were beneficial to their studies and supported their continued use in the future. Anat Sci Educ. © 2012 American Association of Anatomists.     

In-vivo retinal imaging by optical coherence tomography using an RSOD-based phase modulator

Fourier-domain rapid scanning optical delay line （RSOD） was introduced for phase modulation and depth scanning in a time-domain optical coherence tomography （TD-OCT） system. Investigation of parameter optimization of RSOD was conducted. Experiments for RSOD characterization at different parameters of the groove pitch, focal length, galvomirror size, etc. were performed. By implementing the optimized RSOD in our established TD-OCT system with a broadband light source centered at 840 nm with 50 nm bandwidth, in vivo retina imaging of a rabbit was presented, demonstrating the feasibility of high-quality TD-OCT imaging using an RSOD-based phase modulator.     

Electrical process tomography: seeing without eyes inside stirred vessels

Body-scanning exploiting 3-D imaging has revolutionised diagnostics and treatment in medicine. Process engineers would like to be similarly able to image chemical process units in 3-D, but without the ￡multi-million price tag. UMIST and Leeds University have together, through the Virtual Centre for Industrial Process Tomography (http://www. vcipt.org), pioneered several electrical process tomography techniques and used them in a variety of applications. Illustrations are presented to show how electrical resistance tomography (ERT) has been developed for typical stirred vessels widely encountered in batch process manufacturing. The technique is potentially fast and inexpensive and capable of imaging both dynamic and pseudo-stationary processes. Examples from UMIST's two-tonne vessel will be presented for miscible tracer mixing, as well as gas-liquid and solid-liquid mixing.     

本科生导师制的实践与思索 ——以医学影像技术专业为例

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...     

社会认知、文化与大脑——文化神经科学研究

社会交往是人类最重要的活动之一,具有文化多样性。人类在进化中发展出加工关于自我和他人社会信息的特定机制,这些机制受社会文化情境的影响。人脑在加工与自我和他人相关的社会信息时,也表现出神经层面上的文化可塑性。本文介绍了近年来对社会认知及其神经基础的跨文化研究,这些研究促使了文化神经科学的诞生。还讨论了该领域的重要研究问题。