黄曲霉毒素检测方法研究

介绍了目前国内外对黄曲霉毒素的一些检测方法,包括薄层色谱法、高效液相色谱法、溴化荧光分光光度法、免疫分析法、微柱法,并对这些方法的优缺点进行了比较。对黄曲霉毒素的测定提出了一种较快速、简单的方法。     

信任函数的逼近

为了解决各种不精确概率理论难以实际应用的问题．于是信任函数的逼近被提出和研究。Lowrance,ct al和David Hamanec分别提出了信任函数概括逼近法和信任函数的五种启发式计算方法，但这些方法都未能兼顾精度要求和计算速度。本文在比较双逼近法和概括逼近法的优缺点的基础上．给出两种即兼顾精度要求又考虑计算时间的逼近方法。     

软运筹学研究的回顾与展望

软运筹学处理是“议题”的一种软科学方法，是传统运筹学的一个新发展，柔性运筹学是软运筹学发展的初级阶段。软运筹学的发展趋势是更多地采用“物理——事理——人理方法论”；更多地采用“还原论与整体论”相结合的研究手段、更多地采用模糊数学方法、更多地采用“人机结合、以人为主”的技术路线、更多地采用“软计算”。     

独立学院数理统计教学改革的探索

针对独立学院数理统计教学中存在的问题和学生的实际情况,在教学中突出重点,调整传统的教学顺序,分散难点,由浅入深.简单而直观地解释思想方法,注意对知识的归纳和总结,从而收到良好的教学效果.     

Video Summarization Based on Mutual Information and Entropy Sliding Window Method

This paper proposes a video summarization algorithm called the Mutual Information and Entropy based adaptive Sliding Window (MIESW) method, which is specifically for the static summary of gesture videos. Considering that gesture videos usually have uncertain transition postures and unclear movement boundaries or inexplicable frames, we propose a three-step method where the first step involves browsing a video, the second step applies the MIESW method to select candidate key frames, and the third step removes most redundant key frames. In detail, the first step is to convert the video into a sequence of frames and adjust the size of the frames. In the second step, a key frame extraction algorithm named MIESW is executed. The inter-frame mutual information value is used as a metric to adaptively adjust the size of the sliding window to group similar content of the video. Then, based on the entropy value of the frame and the average mutual information value of the frame group, the threshold method is applied to optimize the grouping, and the key frames are extracted. In the third step, speeded up robust features (SURF) analysis is performed to eliminate redundant frames in these candidate key frames. The calculation of Precision, Recall, and Fmeasure are optimized from the perspective of practicality and feasibility. Experiments demonstrate that key frames extracted using our method provide high-quality video summaries and basically cover the main content of the gesture video.     

News Video Summarization Combining SURF and Color Histogram Features

Because the data volume of news videos is increasing exponentially, a way to quickly browse a sketch of the video is important in various applications, such as news media, archives and publicity. This paper proposes a news video summarization method based on SURF features and an improved clustering algorithm, to overcome the defects in existing algorithms that fail to account for changes in shot complexity. Firstly, we extracted SURF features from the video sequences and matched the features between adjacent frames, and then detected the abrupt and gradual boundaries of the shot by calculating similarity scores between adjacent frames with the help of double thresholds. Secondly, we used an improved clustering algorithm to cluster the color histogram of the video frames within the shot, which merged the smaller clusters and then selected the frame closest to the cluster center as the key frame. The experimental results on both the public and self-built datasets show the superiority of our method over the alternatives in terms of accuracy and speed. Additionally, the extracted key frames demonstrate low redundancy and can credibly represent a sketch of news videos.     

应用2D NMR技术对多烯大环内酯抗生素——鲁丝霉素进行结构解析

多烯大环内酯抗生素是抗生素中一个化学类群，由25～37个碳原子组成大内酯环，在环的一部分有共轭多烯结构，对应部位有羟基，并由苷键连接一个或多个氨基糖。这类抗生素具有对光不稳定，抗真菌谱广，静脉给药毒性高，口服毒性低的特点。本文对放线菌-1356产生的抗真菌活性成分，四烯大环内酯——鲁丝霉素进行了UV、IR、MS、1 H NMR 和13C NMR 检测，并通过DEPT 和1 H-1H COSY、HMBC、HSQC 等2D NMR 技术对其1 H NMR 和13C NMR 数据进行了详细的解析和信号归属，并纠正了国外文献对于多烯内酯类化合物13C NMR信号归属的错误，总结了此类化合物的核磁共振谱规律。为以后此类化合物的分析鉴定提供了更完善的依据。     

稀土元素防治植物病害的研究进展

稀土元素在农业上应用的有关研究主要集中在植物生理活性、生理生化机制及稀土元素的卫生毒理学和环境安全性方面，对其在防治植物病害、对植物病原微生物方面的研究较少。本文对稀土元素在防治植物病害及诱导植物抗病性方面进行了综述，重点探讨了稀土元素防治植物病害的作用机制，并展望了此方面的应用前景，期望能够对于进一步研究利用稀土防治植物病害。拓宽稀土元素农用范围发挥一定的指导作用。     

电化学石英晶体微天平的近期应用进展

本文对近几年来电化学石英晶体微天平（EQCM）在吸附，膜的形成，腐蚀和电沉积等方面的应用进行了概述，并对其应用现状和前景进行了分析。     

利巴韦林合成概述

利巴韦林为一种高效广谱抗病毒核苷类药物,文章对利巴韦林的合成方法、原理和优缺点进行了概述。利巴韦林合成方法主要包括化学法、酶促法和发酵法三种;其中化学法的研究最为广泛,酶促法的工业化前景最为广阔,而发酵法仍不成熟。