Oily wastewater treatment by porous ceramics mediums with surface lipophilic modification

Aiming at the treatment of difficult-to-handle oily wastewater, the ceramics filter mediums made from the iron and steel plant sludge were adopted to surface lipophilic modification so as to remove oil efficiently. The hydrolysis technique by FTIR and conductivity test indicated that under acid conditions hydrogen silicon oil did not hydrolyze but release hydrogen by chemical reaction under alkaline conditions. The results of the experiments including contact angle measurement, FTIR analysis, and SEM analysis illustrate that a layer of lipophile coating indeed exists evenly on the surface of filter mediums after modification. Furthermore, the hydrogen-containing silicone oil was combined through dehydration of Si-H bond with the -OH on the surface of ceramic filter medium.     

The properties of solution precursor plasma spray nanostructured thermal barrier coatings

About 300 μm thickness uniform thermal barrier coatings (TBCs) were deposited on the 1Cr18Ni9Ti samples by solution precursor plasma spray (SPPS).The analysis methods,such as TEM,SEM,and XRD were used to characterize the coatings in the aspects of microstructure and phase compositions.The samples were quenched from 1121 ℃ to room temperature by forced-air to measure the thermal cycling capability.Coatings density were measured by means of water displacement.The experimental results show that grain size of the SPPS TBCs is about 30 nm with desired tetragonal phase ZrO2,and the SPPS TBCs(with 16% porosity) consist of arcuate pores,gelatin and melted particles.The hardness of the coatings is HR45Y38.5 and bond strength between coatings and substrates is 24.2 MPa.The thermal shock test show the coatings have a average life of 500 cycles which is about 2.5 times than that of conventional air plasma spray (APS) TBCs.     

化工过程pH值的模糊免疫PID控制

针对化工过程pH值变化的非线性、时滞特点,提出一种模糊免疫PID控制方法;该方法依据生物免疫原理设计免疫反馈PID控制器,并使用模糊控制器来实现免疫反馈的非线性函数,然后优化控制器的参数,最后借助MATLAB工具进行仿真实验;PID控制器比例控制由公式5计算,其参数优化结果为K=4.5,η=2.0,Ki=0.009,Kd=6.0。仿真结果显示,模糊免疫PID控制效果优于自适应模糊PID和普通PID控制的控制效果。     

再生丁基橡胶与非极性不饱和橡胶共混物的性能研究

对再生丁基橡胶(RIIR)与非极性不饱和橡胶共混物的性能进行了研究。结果表明,RIIR易以填料的形式加入到非极性不饱和橡胶中使用,当RIIR以填料的形式加入到NR、BR及SBR中时,不仅使它们的耐热氧老化性及耐屈挠龟裂性得到明显改善,而且使NR及BR的撕裂强度及扯断伸长率提高;RIIR作为生胶与BR及NR共混,可改善BR的耐热氧老化性,提高NR的撕裂强度;SBR与RIIR共混,均使拉伸强度及撕裂强度降低;非极性不饱和二烯类橡胶与RIIR共混后,均使耐磨性降低。     

Synthesis and characterization of CdS nanocrystals embedded on solid electrolyte films

In this article nano‐sized CdS crystal embedded in a PEO matrix was successfully prepared by a complex transformation method that is universal for preparing nanosized compounds containing transition metals. The size of embedded CdS particles was in the nanoscale from 2 to 10 nm determined by X‐ray diffusion. The nanosized CdS displayed the expected blue shift of the onset absorbance in the UV spectrum. The amount of blue shift depends upon the dipping time of the PEO–cadmium complex film in a sodium sulfide solution as well as its concentration. The most effective means for adjusting the size of CdS nanocrystals is to change the ratio of the oxygen along with the PEO chain to the cadmium ion in the complex film. The alkali salt in the film would contribute to the conductivity of the composite film. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 1263–1268, 2002; DOI 10.1002/app.10459     

车辆悬架减震优化设计方法仿真

车辆在不同路况和不同车速等情况下,悬架系统弹性元件受到的冲击大小差异很大,无法形成固定的振动规则,振动剧烈程度与阻尼系数无法关联.传统车辆悬架减振设计方法,采用固定阻尼系数来减少弹性元件的振动,没有考虑不同路况及车速产生的振动剧烈程度不同的问题,减振效果较差.提出一种车辆悬架减震优化有限元设计方法,分析车辆悬架减震器的功能和结构,塑造车辆悬架减震优化模型,采用ANSYS有限元软件中一阶优化方法进行车辆悬架减振优化设计,以悬架减震器阻尼力为优化目标,以减震器阻尼系数为优化设计变量,以静强度和最大减震强度为约束条件,对车辆悬架减震进行有限元优化设计,确保车辆车身振动迅速衰弱,使车身能够很快达到一种稳定状态.实验结果表明,上述方法使车辆减震阻尼力和最大减震强度都优于传统方法,具有较高的稳定性和控制精度.     

基于PSO的负反馈电路参数自适应优化及仿真分析

采用粒子群优化算法,以电压增益、共模抑制比、输入电阻平方根的三者乘积对输出电阻的比作为适应度函数,对差分 共射两级直接耦合电压串联负反馈放大电路中的电阻做自适应优化。结果显示,只要对电路交流指标加以约束,适应度函数值总会减小。当分别对增大电压增益和减小输出电阻进行限制后,电压增益总是尽量小,输出电阻总是尽量大,以使适应度函数在给定约束下取得最大。经EWB软件对优化参数仿真,结果满足线性放大要求。同时说明了可以调整适应度函数形式,找到最佳电路参数,以满足工程上对放大器指标的不同需求。     

Tensile properties,morphology, and thermal behavior of PVC composites containing pine flour and bamboo flour

Composites of unplasticized poly(vinyl chloride) (PVC) blended with bamboo flour and pine flour, respectively, were prepared in a batch mixer followed by compression molding. The effects of wood flour fillers on the morphology, static mechanical properties, and thermal properties of the composites were investigated. Compared with neat PVC resin, the introduction of both bamboo flour and pine flour significantly improved the stiffness of the composites, while decreasing the tensile strength to some extent. Tensile tests showed that pine flour–filled composites exhibited better mechanical properties than those filled with bamboo flour with the same particle size at the same loading level. Scanning electron microscopic examination revealed good dispersion and alignment tendency of short pine fiber within the composites at a lower loading level. Moreover, experimental results indicated that both bamboo flour and pine flour additions showed no obviously adverse effect on the thermal stabilities of these composites. Based on the comprehensive properties, these composites meet the need of woodlike material for use as wood structures. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 1804–1811, 2004     

支持O2O的时空众包激励技术研究

在这个流行元素日新月异的时代,消费者的口味越来越难以把控,商家的判别标准将极大决定店铺的业绩水平.文章介绍了时空众包的概念,研究在商城背景下,利用时空众包思想设计一种能持续有效执行的机制来提高O2O模式的资源利用率问题.     

核动力装置BDS系统仿真与事故分析

蒸汽发生器排污系统(BDS)对核动力装置起着关键性作用,不仅影响蒸汽发生器的换热效率,还关系到汽轮机安全.但是通过近几年核动力装置现场工作人员统计,BDS是一个故障发生概率较大的系统.所以现以BDS为研究对象,通过COSINE程序对该系统进行仿真建模,在验证稳态工况基础上,选择事故概率较高的热交换器泄露事故作为瞬态研究目标,分析事故下系统的热工水力现象,以及给出相应的事故解决方案,并对该事故方案进行优化分析,对动力装置操作的分析具有一定的指导意义.