Variable block-based deblocking filter for H.264/AVC on low-end and low-bit rates terminals

H.264/AVC supports variable block motion compensation, multiple reference frames, 1/4-pixel motion vector accuracy, and in-loop deblocking filter, compared with previous video coding standards. While these coding techniques are major functions for video compression improvement, they lead to high computational complexity at the same time. For the H.264 video coding techniques to be actually applied on low-end/low-bit rates terminals more extensively, it is essential to improve the coding efficiency. Currently the H.264 deblocking filter, which can improve the subjective quality of video, is hardly used on low-end terminals due to computational complexity.In this paper, we propose an enhanced method of deblocking filter that efficiently reduces the blocking artifacts occurring during the low-bit rates video coding. In the ‘variable block-based deblocking filter (VBDF)’ proposed in this paper, the temporal and spatial characteristics of moving pictures are extracted using the variable block-size information of motion compensation, the filter mode is classified into four different modes according to the moving-picture characteristics, and the adaptive filtering is executed in the separate modes. The proposed VBDF can reduce the blocking artifacts, prevent excessive blurring effects, and achieve about 30–40% computational speedup at about the same PSNR compared with the existing methods.     

月桂酰苯甲酰甲烷的合成及其对聚氯乙烯辅助热稳定性能的研究

以月桂酸甲酯和苯乙酮为原料,通过克莱森缩合反应,合成了一种具有β-二酮结构的月桂酰苯甲酰甲烷,用红外光谱、核磁共振波谱对产物结构进行了表征。考察了反应条件对产物收率的影响,最佳的合成工艺条件为:二甲苯为溶剂,新鲜甲醇钠为催化剂,n(月桂酸甲酯):n(苯乙酮)=1.2:1,回流温度下反应3 h,收率可达85%。研究了其作为聚氯乙烯辅助热稳定剂的热稳定性能,结果表明,所制备的月桂酰苯甲酰甲烷是一种优良的聚氯乙烯用无毒辅助热稳定剂。     

平顶形支架可缩协调性研究

介绍了在立式巷道支架试验台上，对不同结构形式平顶形柱腿可缩金属支架的试验结果。分析了支架的力学特征和影响柱腿可缩性的因素。     

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。     

Analysis of alkaloid mixtures by charge-transfer complexation

Binary mixtures of weak and strong UV-absorbing alkaloids were analyzed by a charge-transfer spectrophotometric method, utilizing iodine in ethylene dichloride as the acceptor. In the uncomplexed form, the strong absorbing alkaloid (papaverine, quinine, ergotamine, or reserpine) was measured at a wavelength where there was no interference from weak absorbers (at 335, 332, 315, or 300 nm, respectively). The weak absorbing alkaloid (ephedrine, codeine, atropine, or homatropine methylbromide) was determined by computing its contribution to the total charge-transfer band at 295 nm where absorbance was linearly additive for mixtures. The greater increase in the original epsilon-values of the weak absorbers upon complexation with iodine relative to the corresponding increase in the epsilon-values of the strong absorbers led to good recoveries even at the low dose ratios of the weakly absorbing, and often more potent, alkaloids.