基于COMSOL Multiphysics压电道路中压电陶瓷的发电仿真

该文以COMSOL Multiphysics仿真为基础,分别建立了不同几何形状的三维图像,在限制无关变量的情况下,探讨了不同形状的压电陶瓷材料发出电能的大小,为压电道路中压电单元的铺设做了辅助研究。并且做了相关的参数化分析,验证压电陶瓷发电规律随荷载的变化关系研究发现,正八棱柱体在限制其他无关变量的前提下,使用相同体积的压电材料和相同载荷的作用下发出的电能最多。     

基于自适应比特分配的SAR复图像频域压缩算法

研究合成孔径雷达(SAR)复图像数据的虚实部压缩算法,针对SAR复图像数据的统计特性,提出一种自适应比特分配的改进算法。首先在频域对SAR复图像数据进行自适应加权预处理,然后由香农率失真定理结合拉格朗日乘子法,推导了基于方差的块自适应虚实部最优比特分配公式,给出了整个压缩算法的流程图。根据流程图进行了多次压缩实验,并分析了算法的压缩性能。最后将改进算法与传统算法进行比较,验证了改进算法具有更优的幅度保持和相位保持的特点。     

Effect of Starch Dodecenylsuccinylation on the Adhesion and Film Properties of Dodecenylsuccinylated Starch for Polyester Warp Sizing

A series of dodecenylsuccinylated starches（ DSSs） with different degree of substitution（ DS） were prepared via the esterification of dodencenylsuccinic anhydride with hydrolyzed cornstarch in aqueous dispersion for investigating the influences of starch dodecenylsuccinylation upon the performances such as apparent viscosity and surface tension of starch paste, film behaviors,and adhesion to fibers for warp sizing. It was found that the dodecenylsuccinylation was able to reduce the surface tension of cooked starch paste and enhance the adhesion of starch to polyester fibers. It was also capable of depressing the brittleness of native starch and improving the mechanical behaviours such as breaking elongation and work-to-break of starch film. Initial increase in DS level of dodecenylsuccinylation enhanced these positive effects,while excessively increasing the level resulted in marked reduction in tensile strength of starch film and significant decrement in reaction efficiency. X-ray diffraction patterns of starch films showed the dodecenylsuccinates derivatized onto the backbones of starch depressed the degree of crystallinity of starch film. Based on the paste behaviors, adhesion, and film properties, the dodecenylsuccinylation level is recommended in a range of 0. 015-0. 025 for sizing polyester warps.     

石墨熔盐堆的快中子注量率展平研究

在石墨熔盐堆中,快中子辐照将导致石墨的性能逐渐下降,当快中子积分注量达到3×1022n/cm2时,需对石墨进行更换。本文针对450 MWth石墨熔盐堆单区与三区堆芯设计的快中子注量进行比较研究。结果表明,采用三区堆芯方案可有效展平堆芯快中子注量率,三区堆芯设计的最大快中子注量率为4.2×1013n/cm2·s,比单区堆芯低约33%,在75%负荷因子下,三区堆芯设计可满足30年满功率运行,而不需更换堆芯石墨。     

基于人像字典集的卡通自动生成方法

提出了基于人像字典集的卡通自动生成方法。建立人像字典集。将人像分割为6种组件——眉毛、眼睛、鼻子、嘴巴、脸型、头发,建立与每种组件对应的卡通画素材库,搜集真实人像图片并用组件素材合成相应的卡通画,并计算五官形状特征和头发纹理特征;输入一幅真实人像,通过形状特征匹配得到五官组件,利用纹理特征匹配得到发型,将组件合成得到卡通画。我们的方法简单易行,生成的效果更抽象更具艺术感,还可以应用到其他类型人像风格化上。     

K0R 的一个预序关系

对环R，引进了K0R的一个新的预序.特别地，用此新预序考察了一个Tor?K0R的有关性质.     

Kinetics of Inhibition of Polyphenol Oxidase Obtained from Tobacco Nicotiana Tobacum

In this study, the kinetics of inhibition of polyphenol oxidase by L-cysteine has been investigated. The inhibition of tobacco polyphenol oxidase was studied using the progress-of-substrate-reaction method proposed by Tsou, following the substrate reaction during irreversible inhibition of the enzyme activity. Analysis of the inhibition kinetics shows that inhibition occurs by an irreversible and non-complexation reaction. The microscopic rate constants were determined for reaction of the inhibitor both with the free enzyme and with the enzyme-substrate complex. The results show that the presence of the substrate has a significant protective effect of the enzyme against inactivation by L-cysteine.