MEASUREMENT OF ANGULAR VIBRATION AMPLITUDE BY ACTIVELY BLURRED IMAGES

A novel motion-blur-based method for measuring the angular amplitude of a high-frequency rotational vibration is schemed. The proposed approach combines the active vision concept and the mechanism of motion-from-blur, generates motion blur on the image plane actively by extending exposure time, and utilizes the motion blur information in polar images to estimate the angular amplitude of a high-frequency rotational vibration. This method obtains the analytical results of the angular vibration amplitude from the geometric moments of a motion blurred polar image and an unblurred image for reference. Experimental results are provided to validate the presented scheme.     

一种基于优化可变间隔的视频流传输的带宽探测方法

为解决视频传输中的带宽探测问题,本文提出一种基于可变包间隔的视频流传输带宽探测方法。这种方法利用传输的视频流进行带宽测量,通过视频流发送过程中设置不同的报文,组合可变的包间隔,探测时变的网络传输带宽。由于利用视频流传输进行带宽测量可能导致丢包、拥塞等情况,降低视频接收质量,因此本文在提出利用视频流进行带宽测量的基础上,进一步提出优化视频包发送间隔的方法,解决了带宽探测过程中带宽变化导致的网络拥塞问题。经过测试,证明了所提算法在实时视频的传输过程中可以进行有效的带宽探测,相较传统算法依然可以保持2%以下的逾期丢失率以及良好的PSNR。     

具有自修复性能的纤维素纳米晶/聚氨酯复合材料的制备EI北大核心CSCD

在两步法制备聚氨酯弹性体的基础上,利用溶液共混的方法将纤维素纳米晶添加到热塑性聚氨酯弹性体中制备得到纤维素纳米晶/聚氨酯复合材料,并对复合材料的组成与结构、热力学及力学性能和自修复性能进行了表征。结果表明,与单纯的聚氨酯弹性体相比,纤维素纳米晶/聚氨酯复合材料表现出良好的力学性能,在纤维素纳米晶的质量分数为1%时,拉伸断裂强度和伸长率能够同时提高140%以上。同时,纤维素纳米晶/聚氨酯复合材料中存在的大量动态氢键赋予了材料优异的自修复性能,在50℃修复36h的样品断裂强度和伸长率分别可以达到5.4 MPa和1113%。     

蝇蛆耐高温抗氧化蛋白对离体蛙心活动性的影响

目的:探究蝇蛆耐高温抗氧化蛋白对离体蛙心活动性的影响。方法:利用离体蛙心灌流实验,以心率和心收缩力为指标,研究不同浓度蝇蛆耐高温抗氧化蛋白提取液、0.1%阿托品、0.1%阿托品+极高浓度蝇蛆耐高温抗氧化蛋白提取液混合液对心脏活动性的影响。结果:不同浓度蝇蛆耐高温抗氧化蛋白提取液、阿托品、阿托品+蝇蛆提取液处理的离体蛙心的心率差值与正常对照组相比均无显著性差异(P0.05);一定浓度的蝇蛆耐高温抗氧化蛋白提取液处理后的离体蛙心心收缩力差值与正常对照组相比均有极显著性下降(P0.01),且呈现出心收缩力随提取液浓度增大逐渐降低趋势;阿托品、阿托品+蝇蛆提取液处理的心收缩力差值与正常对照组相比均无显著性差异(P0.05);阿托品+蝇蛆提取液处理的蛙心收缩力与单独的蝇蛆取液处理相比有极显著性下降(P0.01)。结论:家蝇蝇蛆耐高温抗氧化蛋白提取液对心率没有显著影响,对心收缩力有显著抑制作用且这些抑制作用存在量效关系,其抑制心收缩力的机制与M受体系统有关。表明本产品在降低血压、缓解心绞痛以及开发牲畜心血管治疗药物方面具有重要的应用价值。     

Synthesis of A Novel UV-curable Oligmer 1,4-cyclohexanedimethanol Glycidyl Ether Acrylate and Study on Its UV-curing Properties

A novel UV-curable oligmer 1,4-cyclohexanedimethanol glycidyl ether acrylate(CHDMGEA) was synthesized by utilizing 1,4-cyclohexanedimethanol glycidyl ether(CHDMGE) and acrylic acid(AA) as starting materials, triphenyl phosphine as catalyst and p-hydroxyanisole as inhibitor. The optimum synthetic conditions were that the concentration of triphenyl phosphine was 0.90% of reactants by weight, the concentration of p-hydroxyanisole was 0.20% of reactants by weight, the reaction temperature was 90-100 ℃, and the molar ratio of CHDMGE to AA was 0.5:1.1. The experimental results show that CHDMGEA is a kind of good UV-curable oligmer. The impact resistance of the UV-cured films with CHDMGEA as oligmer to prepare UV-curing coating was superior to that of the UV-cured films with bisphenol A diglycidyl ether diacrylate(BPGEA) as oligmer to prepare UV-curing coating.     

基于CIMS环境的回转窑水泥生产线集散控制系统

给出一套基于CIMS环境下的回转窑水泥生产过程的集散控制系统(DCS)，实现对全广的集中管理和各个生产点的分散控制。现场运行证明了该系统的实用性和有效性。     

成膜助剂在乳胶漆中的应用

通过几种成膜助剂与乳相容性的考察，讨论了其对乳液的粘度，冻融稳定性，贮存稳定性，最低成膜温度及涂料性能的影响。     

Calculating structures and free energies of complex molecules: combining molecular mechanics and continuum models

A historical perspective on the application of molecular dynamics (MD) to biological macromolecules is presented. Recent developments combining state-of-the-art force fields with continuum solvation calculations have allowed us to reach the fourth era of MD applications in which one can often derive both accurate structure and accurate relative free energies from molecular dynamics trajectories. We illustrate such applications on nucleic acid duplexes, RNA hairpins, protein folding trajectories, and protein-ligand, protein-protein, and protein-nucleic acid interactions.     

烧结矿竖罐内气固传递过程的实验研究

摘要：基于热力学第二定律和非平衡热力学理论,推导出烧结矿颗粒床层内气固传递特性的一般关系式,并借助自制气固传热实验平台,研究影响烧结矿床层内气固传递特性的主要因素及其影响规律。结果表明：平均传递系数随空气出口温度的升高而逐渐增加。当空气出口温度大于某一数值时,空气流量的增加和烧结矿颗粒直径的减小会导致平均传递系数的增加,反之亦然。对于某一特定的实验工况,随着颗粒雷诺数的增加,温度传递Nusselt数和平均传递Nusselt数逐渐减小,而压力传递Nusselt数逐渐增加,并且当空气出口温度低于某一数值时,平均传递Nusselt数会出现小于0的情况,对强化烧结矿床层内气固传热过程不利。