SAR原始数据压缩的自适应比特分配BAQ算法

针对SAR原始数据压缩,在传统BAQ算法基础上,提出一种分块量化比特率可变的BAQ算法,在保持各分块平均比特率固定的前提下,针对不同的数据分块自适应选择量化比特率。与已有的改进型BAQ算法相比,比特率选择机制基于分块数据的信号功率大小,不需要成像区域的先验知识。新方法能够明显提高数据量化信噪比并降低SAR复图像相位误差,而运算复杂度增加很小,并可以实现分数比特率,适应于不同通信带宽的数据传输需要,增加了SAR原始数据实时传输的灵活性。     

基于相对全变分的复杂背景SAR图像舰船尾迹检测

SAR图像舰船尾迹检测不仅能够反演运动舰船的航速航向信息,也有助于发现图像中弱小的舰船目标。现有的舰船尾迹检测方法对于简单背景SAR图像的检测效果较好,但复杂背景下的检测效果难以满足使用要求。提出一种基于能量泛函极小化的复杂背景SAR图像舰船尾迹检测方法。该方法采用相对全变分技术将图像分解为包含舰船尾迹的光滑成分和海背景纹理成分,通过剪切波变换高频系数重构增强光滑成分,再通过Radon变换检测光滑成分中的尾迹线。比对实验结果表明,本文所提方法对于复杂背景SAR图像的舰船尾迹检测效果明显优于现有的方法。     

Study of the stability of a series of synthetic colorants applied with styrene-acrylic copolymer, widely used in contemporary paintings, concerning the effects of accelerated ageing

This study examines the materials of a contemporary pictorial artwork, belonging to the Macedonian Museum of Contemporary Art in Thessaloniki (Greece), and needing conservation. The combined use of micro-FTIR and micro-Raman spectroscopy allowed the identification of almost all painting materials. Moreover, the stability of a series of synthetic pigments towards accelerated ageing is investigated in applications using the contemporary binding medium styrene-acrylic copolymer. The pigments in question are: Hansa yellow PY3 and PY74, quinacridone PV19 and PR122, naphthol AS PR112, phthalocyanine green PG7 and blue PB15, dioxazine PV37, van Dyck brown PBk11, ivory black PBk9, and titanium dioxide PW6. The organic pigments were applied alone or mixed with titanium dioxide, in rutile form or as a mixture of rutile/anatase. The experimental swatches were subjected to ageing tests, and subsequently studied as to colour changes by means of colorimetric measurements, and as to the molecular structure differentiations by infrared spectroscopy in reflectance mode. The ageing tests included exposure to high temperature and humidity (90 °C, 60% RH) and to ultraviolet radiation (350 nm, 30 °C and 50% RH, with a substantial temperature increase at 90 °C for 3 days). The greater colour difference is caused by high temperature and humidity, whereas paint layers containing TiO₂, and especially the mixture of the forms rutile/anatase, prove very susceptible to ultraviolet radiation, demonstrating a significant colour difference and extended molecular changes.     

谈高校设计色彩教学

能够就色彩在设计领域所涉的诸审美与创造因素进行正确感受与认知.是艺术设计工作者的必备素质.本文分析了现今我国艺术高校于设计色彩基础课教学中存在的弊端极其作为,并提出有关的改革设想.     

模糊综合评价方法在广告效果测定中的运用

广告效果构成因素的复杂性决定了广告效果评价的模糊性.建立广告效果模糊综合评价定量分析模型的步骤包括建立广告效果模糊综合评价的因素集、评价集、权重集、评价矩阵和求得评价结果等内容.     

对我国中小学体育教学模式的理论思考

着重对我国中小学体育教学模式进行理论探讨。提出了多视角、多样化、全方位的体育教学模式新格局,认为提高我国中小学体育教学整体水平的关键在于更新教育观念,建立一定的学说,确定“发展”的体育教学模式。     

现行人工合成材料面层田径场的设计、施工、监理与验收规范

针对目前《体育设施建设标准》只列出设计等级的原则、要求等不足,通过近年来上海市多个新建或改建体育场的实践总结,对人工合成材料面层田径场的设计、施工、监理及验收等具体实施过程,提出了明确的规范要求。     

体育运动技术课程改革的哲学理念问题

从现实问题入手,分析了体育运动技术课程改革的机制性障碍,指出教师的哲理理念影响了教学改革的效率.对多年以来影响术科教师认识运动项目和运动技术课程规律的牛顿机械论世界观进行了深入细致的分析,对后现代系统整体论世界观用于指导运动技术学科课程改革的可能性进行了探讨,介绍了"涌现"原理对于体育运动技术课程改革的指导意义.     

Informing in the Information Age: How to Communicate Measurement Concepts to Education Policy Makers

Current educational policies rely on educational assessments. However, the technical aspects of assessments are often unknown to policy makers, which is dangerous because sound assessment policy requires knowledge of the strengths and limitations of educational tests. In this article, we discuss the importance of informing policy makers of important psychometric issues that should be considered whenever tests are proposed for specific purposes. We discuss the types of information that are important to communicate to policy makers, how to best convey this information in a manner in which it can be understood, and how to be seen as a valuable source of information to education policy makers. We end with some specific steps organizations such as NCME can take to inform policy makers and advocate for valid educational assessment policies.     

我国综合性大型体育赛事场馆设施建设的双重困境

采用文献资料法和数理统计法等，对我国综合性大型体育赛事场馆设施建设的现状进行分析。认为：市场失灵和政府失灵是导致综合性大型体育赛事场馆设施建设困境的主要原因，并就其表现形式和原因进行论述。提出明确政府职能、加大政府投入、建立科学决策机制、提高场馆设施建设决策的科学性、政府与市场合作、实现优势互补、弥补各自缺陷以及实施场馆设施建设的民营化战略发展对策。