数字电视节目推荐系统结构及推荐算法研究

针对数字电视信息过载问题进行了数字电视节目推荐系统的结构和推荐算法研究。构造了包含信息摄取单元、系统分析单元和推荐信息发送单元的数字电视节目推荐系统结构。提出了节目类型分析法,采用节目类型阈值和节目类型聚类两种形式,分别实现了根据经验值的人工分级和任意簇数的自动聚类,达到了有效寻找观众收视兴趣与所观看节目之间的联系的效果。提出了收视行为分析法,采用收视个体行为分析和收视群体行为分析两种形式,通过观众收视数据推测观众收视兴趣,实现了给观众个体或群体推荐感兴趣的电视节目的目的。     

Monte Carlo simulation for the light propagation in two-layered cylindrical biological tissues

The direction cosine for expressing photon propagation in tubular tissue is given. The condition for the dispersed photons' reflection and refraction on the interface is analysed. A Monte Carlo simulation model for simulating light propagation in a two-layered cylindrical biological tissue is constructed. Using this model, we studied the absorbed photon distribution with different tissue parameters in the case of a circular flat beam injecting the tissue. Finally, the photon distribution in a two-layered blood vessel is given by a model constructed according to the reported tissue parameters of the human body.     

铁艺及居室铁艺装饰

本文讨论了我国铁艺的起源、发展和特征以及铁艺在居室装饰中的特征与运用。说明了铁艺已成为家居装饰的艺术特色之一。     

助剂在羊毛低温染色中的应用

综述了羊毛低温染色助剂的种类、染色机理及其研究现状，主要介绍了羊毛低温促染剂WLD、SLD、CMR以及纳米型促染荆、二乙胺预处理对羊毛染色性能的影响。论述了酶对羊毛低温染色性能的影响，包括蛋白酶HAP、Ncwol Lan L处理，氧化剂和蛋白酶联合处理，蛋白酶与壳聚糖预处理工艺的影响。指出低温助剂和酶处理在羊毛低温染色工艺中应用效果良好，具有推广前景。     

丁香精油的超临界CO_2和溶剂回流萃取及其GC-MS分析

研究了超临界CO2流体萃取技术(SFE)和溶剂回流法萃取丁香精油,所得精油经气相色谱(GC)-质谱(MS)分析。结果显示:溶剂回流法宜采用正己烷为溶剂,最佳工艺条件为:料液比(g∶mL)1∶15、回流温度80℃、回流时间30min;SFE最佳工艺条件为:萃取温度45℃、萃取压力12MPa、解析温度50℃、萃取时间90min。验证试验显示:SFE法收油率达到21.04%,高于溶剂回流法(17.401%),所得精油色泽和流动性较优。经GC-MS分析显示:所得精油的组成相似,但含量不同,溶剂回流法除β-石竹烯的含量略高外,3种主要活性物质丁香酚、乙酰基丁香酚、β-石竹烯的的含量和提取率均低于SFE法提取的精油。SFE法是提取丁香精油值得推广和有前景的一种方法。     

Video key frame extraction by unsupervised clustering and feedback adjustment

In video information retrieval,key frame extraction has been recognized as one of the important research issues.Although much progress has been made,the existing approaches are either computationally expensive or ineffective in capturing salient visual content.In this paper,we first discuss the importance of key frame extraction and then briefly review and evaluate the existing approaches.To overcome the shortcominge of the existing approaches,we introduce a new algorithm for key frame extraction based on unsupervised clustring.Meanwhile,we provide a feedback chain to adjust the granularity of the extraction result.The proposed algorithm is both computationally simple and able to capture the visual content.The efficiency and effectiveness are validated by large amount of real-world videos.     

改性蔗渣纤维素吸附剂的研究及应用进展

蔗渣来源丰富,成本低廉,是易被化学基团修饰的可再生资源。改性蔗渣纤维素吸附剂吸附效果好,成本低,是纤维素功能高分子材料的重要发展方向之一。本文综述了近年来国内外以蔗渣纤维素为基础原料制备吸附剂的研究及应用进展。     

Aluminum based reflective nanolens arrays to improve the effectiveness of ultraviolet inactivation of Escherichia coli O157:H7 and Listeria monocytogenes in water and a sucrose solution

Food Science and Biotechnology - Aluminum based reflective nanolens arrays were developed via a series of aluminum electropolishing and anodization steps with subsequent selective dissolution of...     

微冻对南美白对虾质构的影响

以南美白对虾为对象,研究了其在-3℃微冻条件下质构参数(硬度、弹性、剪切力,咀嚼性、黏附性、胶黏性)的变化,同时考察了TVBN值、汁液流失率和感官特性的变化。结果表明:随着贮藏时间的延长,TVBN和汁液流失率均呈上升趋势;在贮藏至第14天以前,硬度、弹性、剪切力、咀嚼性呈上升趋势,之后逐渐下降,而黏附性一直呈现上升趋势,胶黏性呈下降趋势;结合TVBN值、汁液流失率和感官特性测定结果,南美白对虾质构测定结果能够较客观的表现其品质。