A multi-dimensional transfer function approach to photo-acoustic signal analysis

Photo-acoustic signal generation has shown potential for medical tomography. This paper aims to present a consistent and unified approach to the mathematical modelling of the photo-acoustic problem, using a transfer function approach. A generalized version of the Fourier slice theorem is presented and proved. Reconstruction algorithms can be developed based on specific cases of this general theorem. Closed-form solutions to special cases are given in Cartesian, cylindrical and spherical polar coordinates. These can be used to simulate the forward problem and as test cases for any reconstruction algorithms.     

ENIV高光谱数据在植被分析中的应用

在遥感影像处理中,植被指数提取广泛应用于定性和定量评价植被覆盖及其生长活力。本文利用高光谱数据介绍了ENVI遥感图像处理软件对遥感影像进行植被指数分析的方法。     

基于无线电相关链路分析的无携带式定位方法

无线电层析成像(RTI)是通过分析因环境改变引起无线链路接收信号强度(RSS)的变化情况来推测场景信息的过程。本文运用一种新的链路分析方法,该方法通过分别分析场景目标对链路的两种影响,即因阻挡而阴影衰减的影响和因反射而使链路多径分量增加的功率增强影响,得到不同的场景信息,最后综合两种信息得到场景信息,大大减少无线信号噪声干扰。通过实验证实,该方法能减少噪声对RTI的干扰,实验结果有较好的收敛度。     

从教育新行为主义到神经科学：以认知负荷研究的起源与未来为视角

在美国心理学的发展历史上,认知负荷理论的发展长期以来一直受到来自行为主义理论的抑制。行为主义注重强化学习动机和强调学习的简单形式,凸显出越来越明显的研究局限,最终使得新行为主义者利用认知理论来研究复杂的学习问题。认知负荷理论虽然为教学设计与教学实践提供了具体而系统的教学方法,但也存在认知负荷如何测量、相关负荷与外在负荷的来源如何确定的问题。神经科学关于心理负荷与瞳孔放大的研究,以及对监测认知负荷变化的成像方法的研究为解决这些问题提供了思路和实验证据。具体而言．瞳孔放大与血管收缩可以作为心理负荷测量的标准和替代方法;借助于神经科学和生物科学的脑成像方法（如事件相关电位（ERPs）、功能性磁共振成像（fMRI）等）能够揭示大脑工作记忆的基本过程,记录大脑活动的差异,甄别大脑加工活动的模式。在未来,研究者应保持一种开放的心态来看待认知心理学和神经科学在过去与未来取得的进步,并谨慎地应用各种神经科学研究方法来深入地研究作为认知负荷基础的神经和认知机制。我们的最终目标是寻找一个能在认知心理学和神经科学之间架起桥梁的统一理论。     

Preoperative localization and minimally invasive management of primary hyperparathyroidism concomitant with thyroid disease

The coexistence of thyroid diseases with primary hyperparathyroidism （PHPT） can present a challenge in the clinical diagnosis and management for these patients. This study aims to determine the frequency of coexisting thyroid gland lesions in a consecutive series patients with PHPT, and to analyze the clinical features, diagnosis and treatment of these patients. Twenty-two cases of a total of 52 PHPT patients who had synchronous thyroid and parathyroid pathology were surgically managed in this study Thirteen patients had ipsilateral thyroid nodules, and 9 patients had thyroid nodules in contralateral or bilateral side. Seven patients underwent direct parathyroidectomy and hemithyroidectomy via a mini-incision （about 3 cm）, while other 15 procedures were converted to Kocher incision. Seventeen nodular goiter （32.7%）, 2 thyroiditis （3.8%）, 2 thyroid adenoma （3.8%） and 1 thyroid carcinoma （1.9%） coexisting with parathyroid adenoma were pathologically diagnosed. The sensitivity of preoperative ultra- sonography （US） and methoxy-isobutyl-isonitrile （MIBI） scintigraphy for parathyroid lesions was 63.6% and 85.7%; and the overall positive predictive values for MIBI and US were 100% and 95.5% respectively. A high incidence of thyroid diseases that coexisted with PHPT in literatures was briefly reviewed. Our study illustrated the need for clinical awareness of concomitant PHPT and thyroid disease. A combination of US, computed tomography （CT） and MIBI scintigraphy would be recommended for preoperative localization of enlarged parathyroid adenoma and for evaluation of thyroid lesions. Synchronous treatment of associated thyroid abnormalities is desirable, and open minimally invasive surgical approach with additional resection of isolated ipsilateral thyroid nodules is possible in some of these patients.     

GaN类探测成像器件的研究进展及其成果

GaN材料在光电子和微电子领域中得到广泛的应用,因此它是第三代半导体材料的典型代表。它具有宽的直接带隙、强的原子键、高的热导率、化学稳定性好(几乎不被任何酸腐蚀)等性质和强的抗辐照能力,在光电子、高温大功率器件和高频微波器件应用方面有着广阔的前景。在成像技术方面,GaN类的成像器件包括紫外摄像机和紫外数字照相机。     

朗伯圆锥激光后向二维散射成像仿真

二维成像又叫平面成像,能反映目标的形状和材料特性,对于目标的识别具有重要的意义。本文研究的是朗伯圆锥体激光后向散射二维成像。利用朗伯体散射亮度与方向无关的性质来实现算法的设计,推导出朗伯圆锥的激光后向散射光强的表达式。利用C语言实现程序设计,把成像的数据保存为二进制文件,并用二进制读取软件读取数据文件,实现仿真图片的查看,分析了分辨率和激光入射方向对成像的影响,从给出的结果看出本文设计的算法能够实现朗伯圆锥激光后向二维散射成像。     

高职文职教育课程与岗位工作任务对接的实践探索——以襄樊职业技术学院医学影像技术专业为例

以襄樊职业技术学院（以下简称＂我院＂）医学影像技术专业为例,探讨课程与岗位工作任务对接的方式,分析医学影像技术岗位工作与职业能力,推进课程体系、课程内容、教学情境的优化,实现良好对接。     

Queer Imag(in)ing: Liminality as Resistance in Lindqvist's Let the Right One In

This essay explores queer imag(in)ing by analyzing a contemporary vampire text, Let The Right One In, by John Ajvide Lindqvist. As I argue, the rhetorical act of humanizing vampires is inherently limiting for (queer) audiences and indicative of processes that seek to clarify, assimilate, and tame—in short, normalize, which as Michel Foucault states “imposes homogeneity” by stamping out difference. Furthermore, I argue that a text can actively resist moments of normalization with the strategic use of what Victor Turner calls liminality—a (queer) rhetorical tactic that resists while seemingly/simultaneously buttressing a liberal humanist belief wherein difference is denied thus displacing and denying the significance of the Other.