Filtration of micro-particles within multi-fiber arrays by adhesive DEM-CFD simulation

A 3D multi-time scale discrete element method-computational fluid dynamic (DEM-CFD) coupling approach was applied to investigate the filtration of micron-sized particles by different types of fiber arrays. Both the pressure drop and the filtration efficiency were examined to indicate the filtration performance of the fiber arrays. Fibers that were uniformly arrayed in a parallel or staggered manner were compared. Results showed that the staggered array showed a better performance than the parallel array in terms of both pressure drop and filtration efficiency. Further, we compared the performance of different staggered arrays, i.e. a regular case, one densified in the front layers and another densified in the back layers. The front densified array was found to enter the clogging and cake filtration stage in the shortest time, leading to the highest filtration efficiency, but the highest pressure drop. The back densified array still achieved a much higher filtration efficiency, despite a much lower pressure drop comparable to that of the regular array. The results suggest that the two kinds of densified arrays may be suited for different purposes, e.g. baghouse filters or breathing masks.     

A novel multi-objective optimization method for the pressurized reservoir in hydraulic robotics

The pressurized reservoir is a closed hydraulic tank which plays a significant role in enhancing the capabilities of hydraulic driven robotics. The spring pressurized reservoir adopted in this paper requires comprehensive performance, such as weight, size, fluid volume, and pressure, which is hard to balance. A novel interactive multi-objective optimization approach, the feasible space tightening method, is proposed, which is efficient in solving complicated engineering design problems where multiple objectives are determined by multiple design variables. This method provides sufficient information to the designer by visualizing the performance trends within the feasible space as well as its relationship with the design variables. A step towards the final solution could be made by raising the threshold on performance indicators interactively, so that the feasible space is reduced and the remaining solutions are more preferred by the designer. With the help of this new method, the preferred solution of a spring pressurized reservoir is found. Practicability and efficiency are demonstrated in the optimal design process, where the solution is determined within four rounds of interaction between the designer and the optimization program. Tests on the designed prototype show good results.     

Nuss技术治疗小儿漏斗胸

目的:探讨应用NUSS方法治疗小儿漏斗胸的疗效.方法:15例漏斗胸均应用NUSS技术治疗.结果:15例疗效均满意,术后2年取支架后胸廓不变型.只有2例有轻度并发症,但不影响结果.结论:手术的优越性在于微创、美观.手术时间短,操作简单,矫形满意,值得推广.     

减振弹簧的优化设计

本通过圆柱压缩弹簧的工作特点，利用优化设计方法设计减振弹簧，并调用程序库中统一数学模型，解决弹簧设计中的复杂计算。     

《家》与《呼啸山庄》中的情爱文学比较

中外文学史上关于主仆之恋这一爱情模式大都以悲剧结局,这种悲剧属于社会悲剧。文章通过对《家》中觉慧与鸣凤、《呼啸山庄》中希刺克利夫与凯瑟琳这两对艺术形象的比较,分析产生他们爱情悲剧的根源及各自不同的爱情表现形态。在不同的社会制度中,东方的专制主义压制人的个性发展,而西方资本主义制度使人性扭曲,人的道德沦丧。     

物理教学中研究性学习的探讨

文章结合物理学科的特点,提倡在物理教学中开展研究性学习,强调教师应指导学生适当选择研究性学习的内容,培养学生研究性学习的兴趣,进而提高学生的创新能力。     

创新指挥专业教材体系之我见

本文从深层次揭示了专业教材体系设立的基本依据 ,论述了专业教材体系形成和发展的内在机制 ,阐述了当前专业建设和教学任务对教材体系发展的重大影响 ,提出了专业教材体系创新的具体设想     

论鲁迅杂文中类型人物的命名艺术

鲁迅十分重视为杂中的类型形象命名，他为人物命名的手法堪称为一种艺术，在鲁迅的杂中，人物名称不只是简单的代号，它和人物的内在本质有着密切的联系，我们往往可以通过名称去认识人物。     

试论我国高校创新体系内涵

本文从高等学校创新体系这一概念的提出入手,较为系统地对当前我国高教理论界颇具代表性的高等学校创新体系的表述进行了辨析,在此基础上,提出了新的表述并对其内涵进行了全新的阐述.     

充分发挥心理咨询在高校育人中的作用

心理咨询是一种与思想政治教育相得益彰的育人手段，通过提高认识、开展多种形式的咨询、做好咨询基础性工作等来发挥心理咨询在高校育人中的作用。