半合成发动机油基础油调配的仿真研究

采用矿物油、聚α-烯烃、多元醇酯和高压加氢BS光亮油调配半合成发动机油基础油,并测定不同配比下基础油的油膜强度、摩擦系数和粘度指数,通过双隐层BP神经网络对基础油调配进行仿真研究,建立了半合成发动机油基础油调配配方优化模型,经过优化训练后,最终得出综合性能优良的配方组合。按49.9957∶4.3693∶42.4578∶3.1772的配比调配基础油,可以使基础油的油膜强度、摩擦系数和粘度指数分别达到56 kg,0.065和112,经实验后仿真结果与实验结果(56 kg;0.065598;112)极其吻合。     

Effect of electromagnetic and ultrasonic cast rolling on microstructure and properties of 1050 aluminum substrate for presensitized plate

The 1050 aluminum alloy strip was prepared by means of electromagnetic and ultrasonic cast rolling on the modified asymmetric twin roll caster, and then the aluminum substrate for presensitized plate was prepared through cold rolling and annealing.The effects of electromagnetic and ultrasonic cast rolling on microstructure, mechanical properties, surface roughness and electrolytic corrosion properties of 1050 aluminum substrate were studied. The results show that electromagnetic and ultrasonic cast rolling can decrease the average crystallite size of aluminum substrate by 5 μm, increase the crystal boundaries with uniform distribution, and make the second-phase particles with smaller size distributed dispersively in the substrate, meanwhile, it can increase the tensile strength, elongation and micro-hardness by 4.58%, 9.85% and HV 2, respectively, reduce the surface roughness, make the surface appearance more even, electrolytic corrosion polarization curve of aluminum substrate more smooth and the surface corrosion pits with regular shape more dispersive.     

市场营销理论的形成过程

本文分析了市场营销观念的演变(从传统的生产观念到现代的社会营销观念),比较各种观念的适用情况、优缺点;并阐述了相应市场营销理论内涵的改进(由4P到10P和4C)的理念,有助于对市场营销有一个总体的认识。     

1050铝合金板带的多能场非对称铸轧

在d400 mm×500 mm水平式双辊铸轧机上,研究了采用多能场非对称铸轧方法制备1050铝合金板带的最合理工艺参数,并对比分析了多能场非对称铸轧对组织和性能的影响。结果表明：在铸轧区长度70 mm、前箱温度670°C、铸轧速度1.3 m/min、励磁电流10 A、中心频率（13±1）Hz、超声功率200 W、超声波频率（20±0.2）kHz的条件下,制备出具有最佳组织和性能的1050多能场非对称铸轧板带,铸轧板带的中心分凝面消失,晶粒尺寸减小约40%,且分布均匀,微观偏析明显减少,析出相均匀分布于晶界处,铸轧板带的抗拉强度、屈服强度、伸长率和显微硬度分别提高了22.6%、23.66%、38.75%和9.90%。     

油溶性有机钨润滑性能及机理研究

研究了油溶性有机钨——烷基芳胺基二硫代磷酸硫化氧钨（WADTP）的制备、分子结构特征及摩擦学性能。研究结果表明，WADTP添加剂具有烷基、芳基和胺基相结合的独特分子结构，并含有S、P等活性元素，能够有效地改善金属接触面之间的摩擦环境，增强润滑油的抗磨减摩性能。     

油溶性有机钨润滑机理的研究

研究了一种油溶性有机钨--烷基芳胺基二硫代磷酸硫化氧钨(WADTP)的制备、分子结构特征及摩擦学性能.研究结果表明,WADTP添加剂具有烷基、芳基和胺基相结合的独特分子结构,并含有S、P等活性元素,能够有效地改善金属接触面之间的摩擦环境,增强润滑油的抗磨减摩性能.     

纳米WS2颗粒润滑材料的节能环保效果

为考察自制纳米WS2颗粒润滑材料在柴油发动机中的节能环保效果,在FC2000柴油发动机台架上进行系列应用分析实验.性能分析结果表明,添加纳米WS2颗粒的润滑材料在发动机不同转速和不同负载下均能在一定程度上降低发动机燃油消耗率,减少发动机尾气中的NOx含量和颗粒物含量,并且当发动机转速为1700 r/ain、负载为70 ...     

融合历史数据和实时影响因素的精细化负荷预测

随着智能电网技术的飞速发展,对负荷预测的精度提出了越来越高的要求。融合负荷、天气等多源数据,提出了一种基于数据融合的支持向量机精细化负荷预测方法。首先对负荷历史数据进行聚类分析,将运行日分成六类。然后将负荷数据和温度、湿度等天气数据进行融合,针对六类聚类结果分别建立基于数据融合的支持向量机精细化负荷预测模型,并对模型参数进行全局优化。采用不同的预测模型对浙江省某地级市2013年的负荷进行预测,结果表明所提出的负荷预测方法的预测精度明显高于传统的负荷预测方法的预测精度。     

危险化学品的安全管理

危险化学品是一类常见的化学物质,大都具备容易燃烧、容易爆炸、有毒、有害和容易腐蚀等性质,故危险化学品在生产、贮存、装卸、运输等环节中较易造成人员伤亡和财产损失。企业化工生产对危险化学品的使用必不可少,但是其固有的危险性对人身安全、财产安全和生态环境的安全构成极大威胁。尤其是我们国家危险化学品的管理现状不容乐观,所面临的问题也日益突出,以此为出发点,论述了加强危险化学品安全管理的必要性和意义,并且针对我国危险化学品安全管理的现状,提出了一些对策。     

Preparation of tungsten disulfide motor oil and its tribological characteristics

Through using mineral oil and synthetic oil to deploy the semisynthesis base oil, modifying the surfaces of ultrafine tungsten disulfide grains by surface chemical embellishment and adsorption embellishment to make them suspended steadily in the base oil as solid lubricating additive, and adding some function additives, the tungsten disulfide motor oil was prepared. The tribological characteristics of this kind motor oil and the well-known motor oils in our country and overseas were studied. The results show that the oil film strength of this kind of motor oil is respectively 1.06 and 1.38 times of that of shell helix ultra motor oil and great wall motor oil, and its sintering load is 1.75 and 2.33 times of that of them, and when tested under 392 N, 1 450 r/min and 30 min, the friction coefficients of friction pairs lubricated by the tungsten disulfide motor oil decrease with the increase of time, meanwhile, the diameter of worn spot is small, and the surface of worn spot is smooth, and no obvious furrows appear. The experiments indicate that the tungsten disulfide motor oil has the better antiwear, antifriction and extreme pressure properties than the well-known motor oils.