一类工业过程广义预测控制的闭环稳定性

分析一类常见工业过程采用具有前置滤波器的ＧＰＣ的闭环稳定性和鲁棒性，给出模型参数失配的允许范围．     

Generation of sodium hypochlorite (NaOCl) from sodium chloride solution using C/PbO2 and Pb/PbO2 electrodes

Two modified electrodes (Pb/PbO₂ and C/PbO₂) were prepared by electrodepositing a lead oxide layer on lead and carbon substrates. These modified electrodes were used as anodes for the generation of sodium hypochlorite (NaOCl) from sodium chloride solution. Different operating conditions and factors affecting the treatment process of NaOCl generation, including current density, pH values, conductive electrolytes, and electrolysis time, were studied and optimized. By comparison the C/PbO₂ electrode shows a higher efficiency than the Pb/PbO₂ electrode for the generation of NaOCl.     

临汾市沿黄旅游、扶贫公路测设要点

分析沿黄旅游扶贫公路的特点,总结沿黄旅游扶贫的测设要点,强调沿黄旅游、扶贫性能的公路特色,提出公路是旅游景色中的重要组成部分。     

Methyl-accepting chemotaxis proteins: a core sensing element in prokaryotes and archaea

Chemotaxis is the directed motility by means of which microbes sense chemical cues and relocate towards more favorable environments. Methyl-accepting chemotaxis proteins (MCPs) are the most common receptors in bacteria and archaea. They are arranged as trimers of dimers that, in turn, form hexagonal arrays in the cytoplasmic membrane or in the cytoplasm. Several different classes of MCPs have been identified according to their ligand binding region and membrane topology. MCPs have been further classified based on the length and sequence conservation of their cytoplasmic domains. Clusters of membrane-embedded MCPs often localize to the poles of the cell, whereas cytoplasmic MCPs can be targeted to the poles or distributed throughout the cell body. MCPs play an important role in cell survival, pathogenesis, and biodegradation. Bacterial adaptation to diverse environmental conditions promotes diversity among the MCPs. This review summarizes structure, classification, and structure–activity relationship of the known MCP receptors, with a brief overview of the signal transduction mechanisms in bacteria and archaea.     

浅谈建设工程质监管理存在的问题及改进对策

论述了目前质监管理工作存在的问题,并提出了相应的改进措施。     

高职院校构建院系二级管理体制的研究

高职院校二级管理的基本逻辑是一级管理责权过于集中,很难适应规模扩大后管理的需要,解决办法是管理中心下移,将职责、权力下放到系部,在调动系部积极性的同时配套形成监督和内部约束机制,构建院系二级管理体制.本文在论述了高职院校进行二级管理改革基本逻辑及改革动力分析的基础上,系统阐述了高职院校构建二级管理的方法和具体做法.     

基于广义预测控制的对角递归神经网络控制器

提出一种基于广义预测控制的对角递归神经网络控制器，并给出该神经网络控制器和辨识器的学习率范围．仿真实验表明，所采用的神经网络控制结构适合于带纯时延的未知的非线性被控对象的广义预测控制，同时能有效地改善神经网络学习的收敛性．     

蓄热式马蹄焰玻璃窑炉微机控制系统

玻璃窑炉是玻璃制造工业中的重要设备。采用微机对玻璃窑炉热工参数进行自动检测与控制,对于进一步提高产品质量,降低能耗和延长炉龄都有着重要的意义。我们用微机对厦门市玻璃厂4＃蓄热式马蹄焰窑炉的热工参数进行检测与控制,取得了一定的经济效益和社会效益,提高了窑炉的热效率,减少了烟尘排放量,得到用户的充分肯定。     

Insight into the 2004 Sumatra-Andaman earthquake from GPS measurements in southeast Asia

Data collected at approximately 60 Global Positioning System (GPS) sites in southeast Asia show the crustal deformation caused by the 26 December 2004 Sumatra-Andaman earthquake at an unprecedented large scale. Small but significant co-seismic jumps are clearly detected more than 3,000 km from the earthquake epicentre. The nearest sites, still more than 400 km away, show displacements of 10 cm or more. Here we show that the rupture plane for this earthquake must have been at least 1,000 km long and that non-homogeneous slip is required to fit the large displacement gradients revealed by the GPS measurements. Our kinematic analysis of the GPS recordings indicates that the centroid of released deformation is located at least 200 km north of the seismological epicentre. It also provides evidence that the rupture propagated northward sufficiently fast for stations in northern Thailand to have reached their final positions less than 10 min after the earthquake, hence ruling out the hypothesis of a silent slow aseismic rupture.     

Influence of alkaline treatment and fiber loading on the physical and mechanical properties of kenaf/polypropylene composites for variety of applications

Due to current trend and increasing interest towards natural based fiber products, Kenaf (Hibiscus cannabinus) fibers have been used for the developments of many products. Therefore, Kenaf fiber-reinforced composites have been widely used in engineering and industrial applications. The present work deals with the fabricating and characterization of untreated and treated kenaf/polypropylene (PP)-reinforced composites. Composites of PP reinforced with treated and untreated kenaf fibers were fabricated using the injection molding technique. Different fiber loadings of 10, 20, 30, 40, 50 wt% treated and untreated kenaf composites were also prepared. X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy and thermo gravimetric analysis (TGA) were performed on the treated, untreated kenaf fibers and kenaf/PP composites. Moreover, the alkaline-treated kenaf composites exhibit better physical, morphological, and mechanical properties because of the compatibility of kenaf with PP. However, variations in tensile and flexural properties depend on treatment and kenaf fiber contents. The percentage increase in the mechanical properties of the treated kenaf/PP composites relative to that of PP was also measured. In addition, 40 wt% kenaf fiber loading resulted in higher mechanical properties. By contrast, kenaf/PP composite with 50% fiber loading was not successfully prepared because of improper mixing and the burning of kenaf fibers in the PP matrix. To conclude, 40% kenaf/PP composites with superior physical and mechanical properties may be used in variety of applications such as automotive, sports, construction, animal bedding, and mass production industries.