A Novel Parsimonious Neurofuzzy Model Applied to Railway Carriage System Identification and Fault Diagnosis

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考虑信号相关性的逻辑电路可靠度计算方法

随着集成电路特征尺寸不断缩小,软错误已经成为影响电路可靠性的关键因素.计算软错误影响下逻辑电路的信号概率能辅助评估电路的可靠性.引起逻辑电路信号概率计算复杂性的原因是电路中的扇出重汇聚结构,本文提出一种计算软错误影响下逻辑电路可靠度的方法,使用概率公式和多项式运算,对引发相关性问题的扇出源节点变量作降阶处理,再利用计算得到的输出信号概率评估电路可靠度.用LGSynth91基准电路、74系列电路和ISCAS85基准电路为对象进行实验,结果表明所提方法准确有效.     

Multi-dimensional Modeling of the Application of Catalytic Combustion to Homogeneous Charge Compression Ignition Engine

The detailed surface reaction mechanism of methane on rhodium catalyst was analyzed.Comparisons betweennumerical simulation and experiments showed a basic agreement.The combustion process of homogeneouscharge compression ignition(HCCI)engine whose piston surface has been coated with catalyst(rhodium andplatinum)was numerically investigated.A multi-dimensional model with detailed chemical kinetics was built.The effects of catalytic combustion on the ignition timing,the temperature and CO concentration fields,and HC,CO and NO_x emissions of the HCCI engine were discussed.The results showed the ignition timing of the HCCIengine was advanced and the emissions of HC and CO were decreased by the catalysis.     

Polyurethane coating for ductile iron pipes

Polyurethane coating has been widely used in pipe protection because of its perfectly mechano-chemistry properties and convenient application. But, being a solvent coating, a thick coat can not be obtained by spraying once with a common polyurethane coating. Moreover, the common polyurethane coating cures slowly as a result of being a secondary hydroxy polyether polyol. Therefore, it does not meet the requirements of rapid current production nor is it suitable for spraying on the surface of du…     

木通果酵素发酵工艺研究

以三叶木通果为原料,研究复合菌种发酵法制备木通果酵素的最佳工艺。采用单因素分析,实验分析出发酵温度、原料配比、菌种比例等因素对发酵的影响,确定最佳工艺:木通果汁67%,0.2%酵母菌,5%的白砂糖,28℃条件下发酵7 d,然后加3%乳酸菌发酵5 d,得到的木通果发酵液用8%的白砂糖和0.08%的柠檬酸进行调配。制得的木通果酵素饮料酸甜可口、风味适宜,且伴有木通果清香。     

Microstructure and properties of Mg-Li-Al alloys with Mn addition

M agnesium isone ofthe lowestdensity m aterialsand has high specific strength and rigidity and has widespread application (Fig.1).Itisaclose-packed hexagonalm etaland has poorform ability.H owever,itis wellknown thataddition of lithium to m agnesium can produce workable and body-centered cubicstructurealloys [1-5].M agnesium -lithium alloysexhibittwophasestructuresbetween 5.7 % and 10.3 % by wtLicontent,consisting ofthe α-M g (hcp)and β-Li (bcc) phases at room tem perature (Fig.2). The sin…     

采用非线性化学指纹图谱技术测定蜂蜜中糖含量的新方法

本文采用非线性化学指纹图谱技术测定蜂蜜中的主要成分葡萄糖和果糖。以葡萄糖-果糖作为有机底物,改变其相对含量,结果发现振荡周期、诱导期、振荡寿命等参数出现规律性变化。利用上述参数随葡萄糖-果糖含量改变而变化的规律建立数学模型,从而可以测定蜂蜜振荡体系中两种糖的含量,为测定蜂蜜中葡萄糖和果糖的含量提供了一种新方法。此外结合相似系统理论对蜂蜜质量进行了评价,为蜂蜜的定性鉴别提供了新的思路。     

我国主要烤烟品种的亲源系谱分析及育种工作建议

就我国开展烟草育种工作以来先后育成的134个烤烟品种的亲缘关系进行了追溯分析。分析表明,20世纪80年代前烤烟育成品种的主体亲缘为藤县金星、特字400和大金元,含有其亲缘的育成品种占同期育成品种的75%;80年代以来烤烟育成品种的主体亲缘为G28、K326、NC89、红花大金元和净叶黄,此期70.4%的育成品种中含有这5个品种亲缘的遗传背景;我国烤烟生产是在引种美国品种的基础上发展起来的,上述亲缘的起源主要为美国最初应用于烤烟生产的推广品种。虽然当前我国育成并推广的烤烟品种种植面积已经达到80%,显著改变了20世纪中后期长期依赖国外引进品种的被动局面,但目前育成和推广烤烟品种的遗传基础狭窄等问题,是适应性不突出和导致种植单一的重要原因。因此,笔者在分析我国烤烟品种亲源系谱关系的基础上,对今后我国烤烟育种工作进行了思考探讨。     

延边黄牛胴体质量等级的完善及不同等级肉质比较

对延边黄牛胴体质量等级进行完善,为胴体等级标准的建立提供前提条件,并比较不同等级延边黄牛肉肉质差异.结果表明:不同质量等级延边黄牛肉中水分、粗蛋白和粗灰分含量各组间均无显著差异,粗脂肪含量差异显著(P<0.05).不同质量等级延边黄牛肉中失水率、系水率、熟肉率、剪切力差异显著(P<0.05).牛肉质量等级越高,熟肉率和系水率越高,嫩度越好.