非线性动力学理论在反应堆噪声分析中的应用研究

利用非线性动力学理论，给出了反应堆噪声功率振荡的非线性特性的差别方法，并对实际信号进行了处理。结果表明热态模拟运行时，反应堆的功率振荡易发生Hopf分叉，圆周形吸引子是存在的，随机噪声会对维数产生较大的干扰，但基本未改变吸引子的形状。该方法对反应堆的详细分析有一定的实际意义。     

基于DEMATEL-ISM的食品安全治理公众参与能力指标研究

目的构建食品安全治理公众参与能力指标体系,揭示食品安全治理公众参与能力指标之间的相关关系和层级结构。方法运用文献研究和专家调查法构建食品安全治理公众参与能力指标体系,采用DEMATEL-ISM方法研究食品安全治理公众参与能力指标之间的相关关系和层级结构。结果在12个二级指标中有4个指标为重要因素;原因因素包含4个指标,结果因素包含8个指标;食品安全治理公众参与能力指标可划分为3个层级,其中直接层包含参与意识等6个指标,中间层包含法律知识等4个指标,基础层包含食品安全知识等2个指标。结论食品安全治理公众参与能力指标之间存在相互作用关系和典型的层级结构,在加强公众参与能力建设时,应充分考虑指标之间的相互作用关系和层级结构。     

Optical properties of polymeric materials for concentrator photovoltaic systems

As part of our research on materials for concentrator photovoltaics (CPV), we are evaluating the optical properties and solar radiation durability of a number of polymeric materials with potential in CPV applications. For optical materials in imaging or non-imaging optical systems, detailed knowledge of the wavelength-dependent complex index of refraction is important for system design and performance, yet optical properties for many polymeric systems are not available in the literature. Here we report the index of refraction, optical absorbance, haze, and Urbach edge analysis results of various polymers of interest for CPV systems. These values were derived from ellipsometry and from using a VUV-VASE and transmission based absorbance spectroscopy on thick film samples.Fluoropolymers such as poly(tetrafluoroethylene-co-hexafluoropropylene) (Teflon^® FEP), poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether) (Teflon^® PFA) and poly(ethylene-co-tetrafluoroethylene) (Teflon^® ETFE Film) have desirable optical and physical properties for optical applications in CPV. Ethylene backbone polymers such as polyvinylbutyral (PVB) sheet (e.g., DuPont^TM PV5200), and ethylene co-polymers such as poly(ethylene-co-vinyl acetate) (EVA) (e.g., DuPont^TM Elvax^® PV1400), and poly(ethylene-co-methacrylic acid metal salt) ionomer sheet (e.g., DuPont^TM PV5300) have applications as encapsulants in crystalline silicon (c-Si) and other flat plate PV applications. These materials are available with both a wide variety of polymer compositions and additive packages which affect their optical properties such as the UV absorption edge. Even materials such as DuPont’s Kapton^® polyimide films, which are used behind the PV cell for their electrically insulating properties, have optical requirements, and we have also characterized these materials.The detailed optical properties of these materials will be useful in the design of the geometrical optics of a CPV system and optimization of the system’s optical throughput. This information will also provide insights into the system’s optical absorption. This is important, for example in the UV, where this absorption can impact the radiation durability of the materials.     

新的特征点强鲁棒音频水印技术

以均值量化索引调制（MQIM）、特征点为理论基础,提出一种新颖的强鲁棒性数字音频水印技术。该算法选取数字音频的局部能量峰值点作为特征,提取稳定的特征点;以特征点为标记,对特征点后的区域进行分段,利用均值量化索引调制将水印嵌入到原始音频的小波域中。水印提取时无需原始图像。仿真实验表明,提出的算法对常规信号处理（MP3压缩、叠加噪声、重新采样、重新量化等）和去同步攻击（随机剪切、幅度缩放、变调、抖动等）均具有较好的鲁棒性。     

基于特征融合的脱机中文笔迹鉴别

提出一种基于文本依存笔迹特征融合的文本独立特征构造方法。建立基于方向指数直方图法笔迹特征(文本依存特征)的两因子分解模型。笔迹特征可分解成字符因子和书写因子两部分。通过两因子方差分析与数据挖掘,分离出与字符无关的书写因子,得到基于文本依存方法的文本独立特征。该方法对检材与样本笔迹的字符数量较少,特别是相同字很少或是根本没有相同字的情况下,能取得较理想的笔迹鉴别准确率,为少量字笔迹鉴别提供解决问题的思路。     

一种新型有限元网格形状评价指标

本文对通用有限元软件ANSYS与SAP2000中的单个网格评价指标进行了分析与总结。在现有单个网格评价指标计算的基础上,建议了一种新的网格评价指标,该评价指标不仅能用于单个网格的评价,而且能用于复杂的多网格有限元模型。通过C++编程实现了整个评价指标的计算,对悬臂梁模型采用不同网格划分后对形状指标进行计算后,发现按不同网格的形状指标与计算精确度存在明显的正相关性。将其用于多高层建筑结构网格评价,计算结果表明该评价指标是高效而又可靠的。     

Effect of CaCl_2 on RDI and RI of Sinter

 On the premise of maintaining the reducibility of sinter unchanged, it is of great significance to reduce the RDI of sinter, which will improve the permeability of blast furnace burden column, so as to realize stable and smooth performance, and keep high yield and low consumption. Under laboratory conditions, a study was proposed on the RDI and RI of sinter, which was immersed with different types and concentrations of solutions. The results show that Cl- is the main factor for reducing the RDI of sinter, and the RDI and RI of sinter decrease with the increase of Cl- concentration. With comprehensive consideration of the RDI and RI of sinter, when the concentration of Cl- is 2%, the RDI of sinter will be significantly reduced and RI will not be affected. In order to study the mechanism of CaCl2 effect on the RDI and RI of sinter, analysis based on the methods of IR Spectra, SEM and chalcography was adopted.     

Predictive ability of the General Ability Index (GAI) versus the Full Scale IQ among gifted referrals.

The General Ability Index (GAI) is a composite ability score for the Wechsler Intelligence Scale for Children—Fourth Edition (WISC–IV) that minimizes the impact of tasks involving working memory and processing speed. The goal of the current study was to compare the degree to which the Full Scale IQ (FSIQ) and the GAI predict academic achievement in math and reading among a group of 88 children tested for gifted programming. All students had significant variability among their index scores on the WISC–IV. Whereas both the FSIQ and GAI significantly predicted standardized achievement test scores in reading and math, the FSIQ explained more of the variance. In sequential regression analyses, both working memory and verbal comprehension scores explained significant, unique variance in reading and math scores. However, measures of processing speed and perceptual reasoning did not account for significant amounts of variance in achievement scores over and above measures of working memory and verbal comprehension. The inclusion of working memory scores in calculation of the FSIQ appears to account for the difference in prediction between the FSIQ and the GAI. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于熵权灰色关联法的我国石油安全评价

为了能够科学地评价我国石油安全的程度,结合PSR"压力-状态-响应"框架构建了我国石油安全评价指标体系,运用熵权法和灰色关联分析法对我国1993~2014年的石油安全状况进行定量评价。结果表明中国自1993年成为石油净进口国以来,影响中国石油安全的三个主要因素为石油储采比、石油对外依存度和石油储备水平;1993~2014年中国石油安全的压力整体呈增大趋势,而保障石油安全的状态指标大幅波动且有下降趋势,石油响应程度因战略石油储备水平影响表现偏差,从而导致中国石油整体处于不安全状态。     

萌发苦荞淀粉的理化特性及消化性研究

本试验以萌发苦荞为研究对象,对苦荞萌发过程中淀粉的组成,尤其是淀粉颗粒形态的变化规律以及消化特性进行了研究。试验结果表明:经萌发处理后苦荞淀粉组成发生了变化,其中总淀粉质量分数下降了28.35%,随着直链淀粉的增加,直链淀粉与支链淀粉的比例也随之增大,在第3d时达到0.63;萌发苦荞淀粉的组成也发生变化,其中慢消化淀粉含量明显提高(P0.05);同时,适度萌发仅对淀粉颗粒的无定形区晶体结构产生影响,结晶度随着萌发时间增加逐渐增大,形成部分小分子聚合体。体外消化试验表明:较萌发前,苦荞淀粉消化性能明显改善。从萌发苦荞淀粉颗粒结构与体外消化性相关性分析结果可以看出体外消化率即血糖指数与萌发苦荞淀粉平均粒径呈显著正相关,与其结晶度呈显著负相关。从而揭示了萌发后苦荞淀粉粒径变小,结晶度变大,有利于血糖指数的降低。萌发苦荞淀粉血糖指数(GI)均小于55,属于低GI食品,是目前国内外营养与食品界推荐糖尿病人群理想食物。