聚氨酯塑胶地板的阻燃研究

采用三氧化二锑(Sb_2O_3)、磷酸三(2,3-二氯丙基)酯(TDCPP)、水合氧化铝(A1_2O_3·3H_2O)和溴-氧烷基磷酸双酯(PUR-101)等阻燃剂对聚氨酯塑胶地板进行了阻燃改性研究。结果表明,单独使用Sb_2O_3阻燃剂对聚氨酯塑胶地板没有阻燃效果;TDCPP、Al_2O_3·3H_2O、PUR-101及其复合阻燃剂对聚氨酯塑胶地板都有较好的阻燃效果。     

活化硅灰石粉新型填料的研制以及在PVC电缆料上的应用

本文介绍新型填料活化硅灰石粉的研制以及在ＰＶＣ电缆料上的应用，并建立了一种活化指数新概念来判断活化效果。经表面活化处理后的活性硅灰石粉吸水率降低、吸油率变小、粒径变细、活化指数〉９．０。由活性硅灰石粉在ＰＶＣ电缆料中的填充试验表明，在原配方基础上添加１０份活性硅灰石粉，电缆料性能良好，符合国家标准，成本降低。     

基于压缩感知的SAR图像鲁棒编码传输

目的 尽管传统的联合信源信道编码方案可以获得高效的压缩性能,但当信道恶化超过信道编码的纠错能力时会导致解码端重构性能的急剧下降;为此利用压缩感知的民主性提出一种鲁棒的SAR图像编码传输方案,且采用了一系列方法提高该方案的率失真性能。方法 考虑到SAR图像丰富的边缘信息,采用具有更强方向表示能力的方向提升小波变换(DLWT)对SAR图像进行稀疏表示,且为消除压缩感知中恢复非稀疏信号时存在的混叠效应,采用了稀疏滤波方法保证大系数的精确恢复,在解码端采用了高效的Bayesian重建算法获得图像的高性能重建。结果 在同等码率下,与传统的联合信源信道编码方案CCSDS-RS相比,本文方案可以实现更加鲁棒的编码传输,当丢包率达到0.05时,本文方案DSFB-CS获得的重建性能明显要高于CCSDS-RS;与基于Bayesian重建算法TSW-CS的传统方案相比,本文方案可提高峰值信噪比(PSNR)3.9 dB。结论 本文方案DSFB-CS 实现了SAR图像的鲁棒传输,随着丢包率的上升,DSFB-CS获得的重建性能缓慢下降,保证了面对不稳定信道时,解码端可以获得相对稳定的重构图像。     

基于Wallis与距离权重增强的无人机影像拼接缝消除

针对无人机影像拼接缝消除困难的问题,提出了一种基于Wallis匀光和距离权重增强的拼接缝消除算法。首先,应用Wallis匀光消除亮度差异,给出Wallis参数设置方法。然后,提出了一种基于空间相关性的距离权重分配方法,通过增强距离对权重的影响,对拼接缝处的局部纹理错位进行全局优化,起到渐入渐出的平滑过渡效果,消除纹理拼接缝。最后,选取7种不同类型影像对本文方法和其他4种经典算法进行对比,并对8条行带影像进行拼接。实验结果表明：本文算法能高效地消除由于曝光差异与几何变形引起的拼接缝,适用于无人机影像快速处理。     

一种基于SRT-8算法的SIMD浮点除法器的设计与实现

在科学计算、数字信号处理、通信和图像处理等应用中,除法运算是常用的基本操作之一。基于SRT 8除法算法,设计一个SIMD结构的IEEE 754标准浮点除法器,在同一硬件平台上能够实现双精度浮点除法和两个并行的单精度浮点除法。通过优化SRT 8迭代除法结构,提出商选择和余数加法的并行处理,并采用商数字存储技术降低迭代除法的计算延时,提高频率。同时,采用复用策略减少硬件资源开销,节省面积。实验表明,在40nm工艺下,本设计综合cell面积为18601.9681 μm2,运行频率可达2.5GHz,相对传统的SRT 8实现关键延迟减少了23.81%。     

UML用例图在软件工程中的步骤设计研究

用例图作为uml的一种建模图形广泛应用在面向对象软件系统开发过程中,首先,界定了用例图在软件开发周期模型中的应用,接着,以“中国证券交易系统”中“上市公司股票发行”子用例图设计为例,详细描述了功能用例子图的绘制过程,然后,对整个软件系统的用例图的绘制过程进行了描述,给出了待开发系统的整体用例图.     

Microstructure and Properties of Co2+: ZnAl2O4/SiO2 Nanocomposite Glasses Prepared by Sol–Gel Method

Transparent bulk Co²⁺: ZnAl₂O₄/SiO₂ nanocomposites containing nanocrystalline Co²⁺: ZnAl₂O₄ dispersed in silica glass matrix were obtained by the sol–gel method. The gels of composition 89SiO₂–6Al₂O₃–5ZnO− x CoO ( x =0.2, 0.4, 0.6, 0.8, 1.0) (mol%) were prepared at room temperature by using two different aluminum salts, aluminum nitrate and aluminum alkoxide (aluminum-iso-propoxide, Al(OPrⁱ)₃), as starting materials. The transparent gels were converted to the crystalline phase of gahnite by heating above 900°C. The microstructural evolution of gels was characterized. The effect of Co²⁺ concentration on spectroscopic properties was also discussed. Co²⁺: ZnAl₂O₄ nanocrystals dispersed in the SiO₂-based glass are formed at lower heat-treatment temperature and shorter heating time by using Al(OPrⁱ)₃ as raw material.     

农药原药全分析

简要介绍了关于农药全分析的要求并介绍了农药全分析的过程，着重介绍了农药全分析中的三种定性分析方法，比较了它们的优缺点。     

Relationship of structure to properties of surfactants. 16. Linear decyldiphenylether sulfonates

The properties of some well-characterized sodium linear decyldiphenylether (C₁₀DPE)sulfonates have been studied. Among the properties investigated are dynamic and equilibrium surface tension, critical micelle concentration (CMC), area per molecule at the aqueous solution/air interface, wetting time by the Draves technique, foaming by the Ross-Miles method, solubilization, and hydrotropy. The decyldiphenylether moiety appears to be equivalent to a terminally substituted straight alkyl chain of 16 carbon atoms. The trialkyl- and dialkyl-mono-sulfonates have solubilities of < 0.01 g/dm³ in water, but are readily soluble in hexane. The didecyldiphenyl ether disulfonate (DADS) has a very low CMC value (1.0 × 10⁻⁵ mol dm⁻³) in aqueous 0.1 N Na⁺ solution (NaCl), characteristic of surfactants with two hydrophilic and two hydrophobic groups. It also has a much larger area per molecule at the aqueous solution/air interface than the monodecyldiphenyl-ether monosulfonate (MAMS) and a much higher surface tension at the CMC. MAMS has a much lower surface tension at a surface age of 1 second (γ_1s) than either DADS or the monodecyldiphenylether disulfonate (MADS). In agreement with γ_1s and γ_eq values, wetting times increase in the order: MAMS < DADS < MADS and initial foam heights decrease in the order: MAMS > DADS > MADS. Solubilization for three water-insoluble surfactants decreases in the order: DADS > MAMS > MADS, while hydrotropy is most pronounced with the disulfonates.     

Construction of a key-dependent message secure symmetric encryption scheme in the ideal cipher model

Key-dependent message （KDM） security is an important security issue that has attracted much research in recent years. In this paper, we present a new construction of the symmetric encryption scheme in the the ideal cipher model （ICM）; we prove that our scheme is KDM secure against active attacks with respect to arbitrary polynomialtime challenge functions. Our main idea is to introduce a universal hash function （UHF） h as a random value for each encrypfion, and then use s = h（sk） as the key of the ideal cipher F, where sk is the private key of our symmetric encryption scheme. Although many other schemes that are secure against KDM attacks have already been proposed, in both the ideal standard models, the much more significance of our paper is the simplicity in which we implement KDM security against active attacks.