运动、氧化应激与DNA损伤和修复

在分子和基因水平上对运动时氧化应激损伤、氧化应激与DNA损伤以及DNA损伤和修复等几方面关系进行探讨,旨在探讨运动疲劳和损伤发生的分子生物学基础,并对未来运动医学研究的发展趋势进行展望。     

构建网络安全防护体系

随着计算机技术和通信技术的发展,计算机网络将日益成为工业、农业和国防等方面的重要信息交换手段,渗透到社会生活的各个领域.网络安全问题日益突出,为了提高网络的整体安全水平必须全方位的构建网络安全防护体系,本文介绍网络安全防护体系的构建过程,并描述网络安全防护体系结构.     

骨骼肌基因转移系统的建立

以EGFP为标记基因，利用重新构建的pAV-EGFP质粒，采用直接注射方法，进行了离体和在体基因转移研究。实验结果显示，经脂质体包裹后，质粒可以有效地进行细胞转移；DNA表达载体肌肉直接注射后，利用共聚焦显微镜可以在注射点周围的肌细胞观察到绿色荧光蛋白；而在对侧肢PCR和共聚焦显微镜的结果均为阴性。实验结果表明，肌肉直接注射DNA可以在肌肉得到表达，将会为治疗肌肉损伤带来新的方法。     

A color image segmentation method as used in the study of ancient monument decay

In the cultural heritage area, it is of fundamental importance to characterize and classify the conservation state of the materials constituting ancient monuments, in order to study and monitor their decay. Generally, the decay diagnosis is provided by “naked eye” analysis done by expert scientists “walking around” the artifact and recording the conservation state of each individual element they observe. In this paper, a color image segmentation approach, based on histogram threshold and edge detection techniques is presented, to extract degradation regions, characterized by holes or cavities, from color images of stone-materials. The goal is to provide an aid to the decay diagnosis by segmenting degraded regions from color images, computing quantitative data, such as the area and perimeter of the extracted zones, and processing qualitative information, such as various levels of depth detected into the same zones. Since color is a powerful tool in the distinction between objects, a segmentation technique based on color, instead of intensity only, has been used to provide a clearer discrimination between regions. The study case concerns the impressive remains of the Roman Theatre in the city of Aosta (Italy). In particular, we have processed and analyzed some color images of the theatre puddingstones, acquired by a camera.     

金属焊接质量的红外成像检测

介绍一种基于红外成像技术的金属焊接质量的无损检测方法.首先介绍了检测的基本原理和检测装置,然后详细给出了以边缘检测为基础的缺陷检测方法及检测结果.最后通过比较说明,利用红外成像技术对金属焊接质量进行无损检测是一种很有效的方法.     

运动性疲劳分子生物学机制的研究进展

从四个方面(细胞内分子、细胞膜分子、细胞外分子和其他广泛存在的分子和离子)综合分析运动性疲劳分子生物学机制的研究进展,以期达到完善运动性疲劳机制理论体系的目的.     

A Framework for Policies and Practices to Improve Test Security Programs: Prevention,Detection, Investigation,and Resolution (PDIR)

Test security is not an end in itself; it is important because we want to be able to make valid interpretations from test scores. In this article, I propose a framework for comprehensive test security systems: prevention, detection, investigation, and resolution. The article discusses threats to test security, roles and responsibilities, rigorous training for everyone involved in testing, and an evaluation of current practices in test security. I call on everyone responsible for testing programs—the Association of Test Publishers, Council of Chief State School Officers, National Council on Measurement in Education, U.S. Department of Education, and state assessment program managers, their vendors, and the research community—to collaborate on guidelines and practices for security violation prevention, detection, investigation, and resolution.     

低重复率稿件中的学术不端行为检测与防范

重复率低却存在抄袭的稿件,其原因可能为单一的检测系统存在漏洞,新发表的论文上传数据库存在时间差,作者对稿件的有意识“修饰”,以及网络时代造假手段多样化.为此,文中提出以下措施:使用多种数据库进行文字检测,从查重报告中发现问题,建立有效的审稿专家数据库、网站教育和警示,充分利用网络资源,加快稿件处理进程,增强编辑的责任意识等,以利于更好地防范学术不端行为.     

A learning-based method to detect and segment text from scene images

This paper proposes a learning-based method for text detection and text segmentation in natural scene images. First, the input image is decomposed into multiple connected-components (CCs) by Niblack clustering algorithm. Then all the CCs including text CCs and non-text CCs are verified on their text features by a 2-stage classification module, where most non-text CCs are discarded by an attentional cascade classifier and remaining CCs are further verified by an SVM. All the accepted CCs are output to result in text only binary image. Experiments with many images in different scenes showed satisfactory performance of our proposed method.     

DNA生物大分子的动力学特性与生物功能(Ⅱ)

对ＤＮＡ中激发的孤立子进行了分类，同时也研究了它的一些特点．我们着重研究了用此理论解释ＤＮＡ的基本生物功能──复制和转录及遗传与变异等问题．