Asymptotic Properties of a Probabilistic‐Statistical Model of Particle Classification in Hydrocyclones

The peculiarities of practical implementation of a probabilistic‐statistical model for a hydrodynamic stage of particle classification process of liquid‐solid polydisperse systems in cylinder‐conic hydrocyclones of small size have been investigated. Within reasonable assumptions, stationary solutions of the Fokker‐Planck‐Kolmogorov kinetic equation were obtained for the considered separation process. In order to describe changes in characteristics of suspension separation in hydrocyclones it was proposed to use stationary distributions, which parameters depend not only on hydraulic and dynamic features of flows inside an apparatus, but also are determined by relative magnitudes of the impact of particle classification and centrifugal forces in comparison with the intensity of random perturbations.     

ACTIFLO--一种新型高效水处理澄清工艺

ACTIFLO是一种新型澄清工艺,具有处理效果好、运行稳定、操作管理简便、占地省等优点。文章介绍了ACTIFLO工艺的工作流程、系统特点以及在巴黎水厂的应用实例,ACTIFLO工艺在国内自来水处理中具有良好的应用前景。     

500kV变压器的绝缘研究

根据５００ＫＶ系统的绝缘特点,指出了长期工作电压对５００ＫＶ变压器绝缘的重要影响,为了保证变压器在长期工作时的可靠性,必须注意提高产品的局部放电性能。为此需要对高压电极进行良好的屏蔽,控制各带电部分的工作场强不大于允许值,加强对绝缘的处理工艺,并要对接地电极给予高度重视 。     

FCC油浆糠醛加助剂预处理工艺

为了充分合理的利用FCC油浆中含有的饱和烃和稠环芳烃,采用糠醛加复合助剂的方法精制催化裂化油浆。通过加入复合助剂,改善糠醛的溶解能力和选择性,从而提高精制油收率,改善精制油质量。通过实验确定了糠醛精制油浆的最佳操作条件:温度为50℃;剂油体积比为1∶1;停留时间30min;最高精制油质量收率为51.95%。糠醛加复合助剂的最佳精制条件为:A、B复配体积比为0.5∶1;助剂相对糠醛的体积分数为8%;剂油体积比为0.5∶1;温度为50℃。在此精制条件下,精制油的收率可达66.46%,比糠醛精制的精制油收率高14.8%,精制油质量亦有所提高,是良好的催化裂化原料;抽出油中富含稠环芳烃,可作为生产增塑剂、软化剂、针状焦等高附加值化工产品的原料。     

气泡增强型水力旋流器的数值模拟研究

采用欧拉模型与离散相模型相结合的方法对气泡增强型水力旋流器中油-气-水三相流场进行数值模 拟,分析了速度场和油滴粒子的运动轨迹,并且对比了油滴粒径、工作流量、含油浓度3种不同因素对注气后水力旋 流器与常规水力旋流器分离效率的影响。数值模拟结果表明,注气后水力旋流器内流场的切向速度和轴向速度较 常规水力旋流器更高,油滴分离所需的时间更短,对30μm 以上油滴的分离效率比常规水力旋流器高出约20%。从 数值模拟的角度验证了入口注气可以提升水力旋流器的分离性能。     

扑虱螟乳油活性成分的气相色谱分析

在恒温条件下，在同一色谱柱上分析乳油中甲胺磷、甲基－１６０５、异稻瘟净和噻嗪酮的含量，并对其重现性、线性范围及回收率进行了测定。结果表明：变异系数为１．２０～２．０１，相关系数为０．９９５２～０．９９８５，平均回收率为９６．０６％～１０１．０７％。     

鞅在带支出的复合负二项风险模型中的应用

文中讨论了在离散时间的情况下,对保险费的收取过程和索赔过程都是复合负二项过程,并且用鞅分析方法对保险公司支出的风险模型进行了研究,得出了最终破产概率.同时讨论了离散情况下的Lundberg不等式.     

《说文解字》与许慎哲学思想浅析

阐述了许慎《说文解字》中所包含的历史的唯物的文字观和唯心主义的文字学思想,并从时代、社会和作者自身两个角度对许慎《说文解字》中哲学思想的二元性进行了剖析。     

关于土木工程中的FRP应用问题

近年来,纤维增强复合材料筋（FRP筋）代替普通钢筋已引起土木科技工作者的广泛关注,纤维增强复合材料型材代替型钢已用于试点工程实践。同时,国外关于粘贴纤维片材加固混凝土结构的研究及应用也非常盛行,由于纤维增强复合材料强度很高,弹模与钢材基本持平,当结构破坏或不能正常使用时一般其强度不能得以充分发挥。因此,开展例如纤维增强复合材料预应力混凝土结构等研究。为达到既提高工程的耐久性,又使纤维增强聚合物的强度得以充分发挥的工程应用之目的具有重要意义。     

Room temperature electrodeposition of aluminum antimonide compound semiconductor

AlSb is a group III-V compound semiconductor material that is conventionally grown by high temperature processes such as Czochralski and Bridgman methods. Development of a method to synthesize AlSb at room temperature will be more economical to help modulate the electronic properties. In this investigation, a pulsed potential electrodeposition method using a room temperature molten salt system (aluminum trichloride, AlCl₃/1-methyl-3-ethylimidazolium chloride, EMIC) with an addition of SbCl₃ is discussed. The potential pulse parameters were established by carrying out cyclic voltammetry at different concentrations of SbCl₃ and with varying molar ratios of AlCl₃/EMIC. Stoichiometric AlSb deposits were obtained from an acidic AlCl₃/EMIC (1.5:1 molar ratio) melt containing 4 × 10⁻³ mol/l of SbCl₃ onto an ordered TiO₂ nanotubular template. The AlSb compound was predominantly amorphous in as-deposited condition and annealing at 350 °C for 2 h in argon transformed into crystalline phase. The AlSb deposit showed a high resistivity in the order of 10⁹ Ω-cm and a defect concentration of 10¹⁶ cm⁻³ which was attributed to presence of carbon. The deposits obtained from a basic melt (0.67:1 molar ratio of AlCl₃/EMIC) were enriched with antimony.