基于云模型和改进TOPSIS法的电力设备状态检修控制策略

阐述了用灰色关联度对TOPSIS法进行的改进,同时融合了云模型与改进TOPSIS法的优势,利用云模型克服了决策过程中评价语言集的模糊性和随机性。利用灰色关联度TOPSIS方法解决了评价语言集的灰色性,提出了基于云模型和改进TOPSIS法的电力设备状态检修控制策略,通过算例比较证明了该方法的可信度。     

Japanese Barley Meets Australia: Quality Performance of Malting Barley Grown in Different Countries

The aim of this study is to establish whether it is possible to select malting barley showing high quality under Australian conditions on the basis of malting quality data from the crop of the same genotype grown at a breeding station in Japan. Two approaches were taken to analyse the data obtained over several years. The first was a bivariate mixed model used to obtain variety estimates for the various quality traits of interest. The second approach used a univariate mixed model to determine the correlation between the same genotype grown in Australia and Japan, as well as the correlation between the same genotype grown at trial sites within a country. The first analysis found that nitrogen was related to most malting quality traits except for viscosity. The second analysis showed that the performance in Australia and Japan is similar for all malting quality traits. It may therefore be possible to select barley showing high malting quality under Australian conditions on the basis of malting quality data from the Japanese crop of the same genotype.     

粉质质量指数(FQN)对于评价小麦粉品质的实用价值研究

对85份小麦试样的粉质质量指数(FQN)、评价值和粉质仪的其它测试参数之间的相关关系进行了研究。结果表明：在FQN与评价值之间存在着极显著的相关关系。FQN或评价值与粉质仪其它测试参数之间的相关关系具有非线性的特征。FQN与稳定时间之间存在着极显著的相关关系，可用于反映强筋和中筋小麦粉的筋办和耐揉性。     

基于空间相关性的风电功率预测研究综述

由于风电具有很强的随机性和波动性,因此大规模风电并网会对电力系统的运行和稳定性造成很大的影响。如何准确预测区域风电场的功率已经成为当今电力系统亟待解决的研究课题。现有的风电功率预测方法未考虑空间相关因素,预测体系有待进一步完善。基于空间相关性的风电功率预测是一种考虑了本地信息和空间相关信息的综合预测方法。文中给出了基于空间相关性的风电功率预测的定义、概念和基本特点,分别从统计模型、物理模型、空间降尺度过程和空间升尺度过程4个方面详细阐述了基于空间相关性的风电功率预测的实现方法,并对空间相关性在风电功率预测方面应用的最新国内外研究进展作了系统的分析评述。最后,针对该领域尚存在的问题与不足,总结了今后的发展方向和需要进一步探索的研究内容。     

基于单势阱随机共振的多频周期微弱信号检测

经典随机共振（SR）应用于微弱信号检测,在取得较好效果的同时也带来了最佳系统参数调节困难的问题.单势阱随机共振（SSR）只需调整一个系统参数,更容易调整系统到最佳状态.在研究了单势阱随机共振理论基础上,对多频周期信号加上与实际更为接近的色噪声,采用互相关系数作为测度指标,运用自适应方法寻找系统最优参数后,系统设置该参数,从待测信号中检测出多频周期微弱信号.实验结果表明单势阱随机共振对多频周期微弱信号具有较好的检测效果.     

发酵香肠理化特性和感官质量相关性研究

对市售26种发酵香肠的理化特性和感官指标及相互间相关关系进行了研究。通过酸价、酸度、过氧化值、游离脂肪酸、pH值、挥发性盐基氮、水分含量、脂肪含量、直径与感官质量评测发现，市售各品种发酵香肠理化特性与感官质量指标存在较大差异，理化特性和感官质量的相关性研究表明，水分含量，酸价，游离脂肪酸，pH值等应作为发酵香肠品质设计、管理的必要理化指标。     

基于告警关联的数据网络故障管理模型研究

为实现基于告警关联的数据网络故障管理,文章建立了3种关联场景,并进行了系统网管的自主研发,通过对不同告警关联的分析,有效地识别对数据网络故障的产生具有主要影响作用的告警,实现了对故障的快速定位、诊断,并及时排除故障。系统在实际中的应用,为现实网络的网管提供了指引性的方法和路线。     

面包小麦品质和产量若干性状的相关性

利用国内外40个面包小麦品种(系)进行了品质和产量若干性状的相关性分析，结果表明，SDS-沉降值与籽粒蛋白质含量、湿面筋含量间呈显著正相关，与比沉降值、伯尔辛值、高分子量麦谷蛋白亚基品质评分之间呈极显著正相关；籽粒蛋白质含量、湿面筋含量与比沉降值、伯尔辛克值、高分子量麦谷蛋白亚基品质评分之间没有相关性。籽粒蛋白质含量、湿面筋含量与株粒重、收获指数、穗粒数呈显著或极显著负相关；SDS-沉降值、伯尔辛克值与株粒重等产量性状间几乎没有相关性；比沉降值与株粒重呈弱的正相关，与收获指数呈显著正相关。讨论认为，在现阶段我国小麦品质育种中，筛选和利用具有优良蛋白质品质，比沉降值高的亲本资源来选育高产优质新品种，具有十分重要的意义。     

An improved islanding detection method based on correlation technique using reactive power variation

This paper presents an improved islanding detection method based on a correlation technique using reactive power variation for a three‐phase grid‐connected photovoltaic (PV) inverter system. Using a conventional reactive power variation (RPV) method for anti‐islanding, the reactive power component of PV inverter output varies periodically within a range of fixed magnitude for the inverter output frequency to go beyond the threshold of the over‐frequency relay or under‐frequency relay. While the conventional RPV method depends on the frequency relays, the proposed method uses a correlation factor between the commanded reactive power and the corresponding inverter frequency as an islanding detection indicator without relying on the frequency relays. The correlation factor of the proposed method is based on the fact that the commanded reactive power of a PV has a strong correlation with the frequency of the inverter voltage when islanding occurs. The proposed method has fast islanding detection capability and high power quality. In order to verify the proposed islanding detection method, the anti‐islanding experimental results of a 250‐kW three‐phase PV inverter by IEEE Std. 1547.1‐2005 are provided. © 2014 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

Potential step study of electrooxidation of methanol in 1-butyl-3-methylimidazolium tetrafluoroborate

A potential step method was used to characterize the electrooxidation of methanol on a chemically modified electrode in an ionic liquid solvent. Two major findings were reported from this study. Firstly, the oxidation was dominant 2.2 s after the potential step. Before that, the double layer charging and adsorption were dominant. Therefore, there should be a waiting time of a few seconds if a methanol sensor is developed with a potential step method. Secondly, the oxidation of methanol on the electrode was diffusion controlled. The concentration of methanol affected the diffusion. The diffusion constant D₀ was 8.37 × 10⁻¹⁷ m²/s when the concentration was lower than 0.5 M and was 2.66 × 10⁻¹³ m²/s when the concentration was higher than 1.0 M. This suggests that the methanol concentration should be kept higher than a threshold in an ionic liquid based fuel cell.