国有股减持是国有企业资本结构治理的必然选择

从国有股减持的必要性，国有股减持的目标，以及国有股减持的最优路径选择三个方面．论述了国有股减持是国有企业资本治理的必然选择。     

一种求解Job Shop问题的合作型协同进化算法

针对Job Shop调度问题，提出了一种改进的合作型协同进化算法。根据机器数量“自然”分割种群，每个种群对应一台机器，个体以机器前工件的优先列表为编码；将静态繁殖理论引入遗传算子，并通过三种共生伙伴选择方式，利用改进的基于优先列表的G＆T算法解码来评价个体；最后采用一种更新技术和动态群体更新策略来加快算法收敛。通过对Job Shop基准问题的优化，该算法获得了比传统的遗传算法更好的结果。     

制动摩擦材料高速摩擦学性能的主要影响因素

综述了高速条件下速度、温度、压力对制动材料摩擦学性能的影响。重点讨论了摩擦表面的相对滑动速度对摩擦学性能的影响.     

汽车动力总成液阻悬置液-固耦合非线性动力学仿真

液阻悬置是一种先进的隔振元件,广泛应用于汽车动力总成的隔振系统中。目前对液阻悬置动特性的仿真均采用集总参数模型,模型所需的物理参数主要由液阻悬置相应的元件进行试验得到。以惯性通道-解耦盘式液阻悬置为研究对象,建立了其性能分析的液-固耦合有限元模型;利用该模型对其静、动特性进行了仿真,并和试验值进行了对比。计算分析了液阻悬置的-些内部特征参数的变化规律,其结果与液阻悬置的工作机理或试验结果相符合。利用液-固耦合有限元模型对液阻悬置进行仿真时,只需橡胶材料的应力-应变关系、液体的性能参数和液阻悬置的几何参数。应用该法可以在液阻悬置的设计开发阶段较精确地预测产品的性能和进行优化设计,有利于提高产品设计质量、缩短开发周期。     

Synthesis and photocatalytic properties of CdS-intercalated metal oxides

Photocatalytic properties for hydrogen production were investigated on layered titanium compounds intercalating CdS in the interlayer, which were prepared by direct cation exchange reactions and sulfurization processes. The photocatalytic activity of the compounds intercalating CdS was superior to those of simple CdS and the physical mixture of CdS and metal oxides. The improvement might be attributed to the formation of microheterjunctions between the CdS nanoparticles and the layers of oxides. The activity was also enhanced by the substitution of Nb for partial Ti in K₂Ti₄O₉, which led to the increase in CdS content in the interlayer and the rapid transport of photogenerated electrons through the layer of metal oxide.     

Development trends of environmental protection technologies for Chinese steel industry

Chinese steel industry has made significant progress on reducing fresh water consumption and CO2/SO2/COD (chemical oxygen demand)/dust emissions,and improving comprehensive utilization of solid waste.Some steel companies have become topped worldwide.However,due to the large output quantity of crude steel,the whole steel industry is still a huge source of pollutants.At present,environmental protection standards are encountering challenges of lack of technical support,taxation policy and other issues.Steel industry is currently facing enormous environmental pressure.The development trends of environmental protection technologies were studied by summarizing different development stages.To realize the development targets,the industry needs to carry out its research with independent intellectual property rights,develop comprehensive management systems and establish ecological chain with other industries.This can not only raise the level of environmental protection in a broader range,but also improve the energy efficiency of iron and steel plants and increase added value of waste utilization.Finally,23 environmental protection technologies were proposed and 4 new environmental protection practices were studied.     

OCr18Ni9换热器应力腐蚀开裂失效分析

某厂锅炉给水预热器在投入使用3.5年后,管箱外壁近横焊缝处发现裂纹.该换热器设计材质为0Cr18Ni9,截取含有裂纹的试样,进行化学成分分析、金相分析、硬度检测、拉伸强度测试、裂纹分析和扫描电子显微镜分析.材质Cr元素含量17.75％,硬度306HV10,这两项检测结果不符合GB/T 4237-2007《不锈钢热轧钢板...     

基于内禀模态能量比呼吸信号特征参数提取方法

呼吸信号组成成分复杂,且是非平稳信号。对呼吸信号进行时域特征分析时,由于呼吸间隔提取存在误差,有时得到的特征值不能精确判断哮喘。为了提高诊断哮喘的精度,提出了检测哮喘的2个新的参数。首先对呼吸信号进行EMD(经验模态分解)分解,提出了一个参数——内禀模态能量比。然后对呼吸信号进行时域分析,利用HHT(Hilbert-Huang)变换和阈值法相结合的方法检测呼吸间隔,根据呼吸间隔符合指数定律,得到另一个参数。最后通过2个参数进行对比判别。通过典型数据分析结果表明,基于EMD分解的内禀模态能量比检测不受波形和基线漂移的影响,能够正确地反映呼吸信息,准确率高,可作哮喘病情评估随访的重要手段。     

Preparation of nickel oxyhydroxide by a new electrolysis method using spherical β-Ni(OH)2

This paper introduces a novel electrolysis method to prepare NiOOH by oxidizing spherical Ni(OH)₂ in a dilute alkaline solution (pH = 8–13). The effects of preparation conditions, including KCl concentration, pH, constant voltage, temperature and oxidation time, on the synthesis of NiOOH were systematically investigated. The results show that the electrolytic efficiency and reaction rate are superior and the electrolyte can be conveniently re-utilized. The physical properties and electrochemical performance of NiOOH samples were also studied. The results show that the NiOOH, prepared by this electrolysis method, is pure β phase, even if the electrolysis duration is fully prolonged. The spherical NiOOH sample not only possesses excellent electrochemical activities, providing discharge capacities of 256.5 and 199.1 mAh g⁻¹, and volume capacities of 625.86 and 485.80 mAh cm⁻³ at rates of 0.2 C and 3 C, respectively, but also has the high tap density of 2.44 g cm⁻³. Moreover, the synthesis process of the new electrolysis method is environmentally friendly, cost saving, and efficient for a large-scale production.     

Temperature‐Programmed Oxidation of Soot in a Hybrid Catalysis‐Plasma System

Non‐thermal plasma (NTP) technology was applied to promote the temperature‐programmed oxidation (TPO) of soot over a perovskites type of La_0.8K_0.2MnO₃ catalyst. The O radicals originating from the decomposition of O₂, as well as NO dissociation if nitrogen oxide were involved, reduce the ignition temperatures of soot. In NO‐O₂‐He, for example, the ignition temperature decreased to 240 °C from 290 °C as the voltage increased from 0 kV to 15 kV. The higher voltage also benefited the adsorption of NO molecules onto the catalyst surface (NO_ad). As a result, the maximum N₂/NO ratio (conversion ratio of NO into N₂) rose from 23 % to 53 %. Some of the NO molecules were dissociated into N and O radicals in plasma, and hence, the N₂/NO ratio was further enhanced due to the combination of N atoms. In any case, the redox process between NO_x and soot proved to be important in soot oxidation.