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.     

烟草感染赤星病后几种酶的动态及其作用

对11个烤烟品种接种赤星病病原菌后,定期测定叶片的过氧化物酶(POD)同工酶、多酚氧化酶(PPO)、硝酸还原酶(NR)和抗坏血酸氧化酶活性,观察其变化规律．结果表明,相对抗赤星病强的品种,PPO活性上升;POD同工酶活性变幅大而快,接种初期活性稍有下降,然后增强,其中以阴极端2,4同工酶带增加较快,180 h由弱酶带变为强带;NR活性变化不大;抗坏血酸氧化酶活性提高．相反,抗赤星病弱的品种,PPO活性下降;POD同工酶变化不大,呈下降趋势;NR活性变幅大;抗坏血酸氧化酶在接种初期活性下降,84 h后回升．通过对不同品种的烟株接种赤星病菌后几种酶活性的测定,探察到一些抗病机理,也为进一步寻找筛选抗烟草赤星病的生化指标提供了参考．     

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.     

有线电视互动频道的建设

文章首先介绍了CATV互动频道，并对有线电视开播互动频道的可行性进行了分析，阐述了有线电视互动频道的建设，最后给出了点播业务的运行策略。     

中西古代婚姻比较研究

本文立足于中国的春秋战国时代，西方的中世纪这两个特定的历史时期中西方婚姻制度的规定，对中西方婚姻分别从结婚的目的、婚姻成立的要件、当事人在婚姻中的地位、婚姻的形式等方面进行论述，探求中西方古代婚姻理念的异同及其原因，以期为中国未来的法治建设提供思路。     

论社会主义和谐大学及其构建

和谐大学主要指能营造出人与自身、人与人、人与学校和谐关系的大学。它的基本特征是以学生为本、促进学生全面发展的大学,是充满发展活力的大学,是有序的大学,是公平和正义的大学。构建和谐大学要处理好与落实科学发展观的关系、与深化大学改革的关系、大学内各群体间的利益关系以及公平与效率的关系。和谐大学的发展机制主要包括:动力机制、利益均衡机制和公平机制。     

社会纠纷解决机制:一元与多元机制选择研究

近年来,我国调控社会的模式历经了社会管控———社会管理———社会治理的转变,过去单纯依托(信赖)法律(或少数民族地区习惯法)定纷止争的一元思维,即诉讼全能主义虽得到较大程度的改变,一些国内研究纠纷解决机制的学者也将学术视野从诉讼全能主义转移到多元化纠纷解决机制上,但一元与多元纠纷解决机制之争从未停歇,诸如"诉讼胜于一切"司法绝对权威"多元化解某某模式"等观点及路径层出不穷.笔者在结合村寨调查基础上,深入对比两种机制的优劣,认为多元更适应时代之变革现状,并提出了完善多元纠纷解决机制的一些构想.     

A framework of region-based dynamic image fusion

INTRODUCTION Image fusion is a sub-area of more general topics of Information Fusion and Data Fusion and deals with static images and dynamic images (image sequences or video data) (Maitre and Bloch, 1997). By com-bining the information from a range of image data obtained by different sensors or the same sensor with different imaging schemes, the composite image al-ways presents the complementary information of different input images at the same time and provides us the integrated descr…     

单边极大算子的加权弱型不等式

本文讨论了单边极大算子的加权弱型不等式．得到了加权弱型混合Φ—不等式及加权弱型（p，q）不等式成立的充分必要条件。     

地方大学的适切性——从大学与政府和社会关系的角度分析

在我国,地方大学的适切性,内在表现为受政府的影响和制约的程度,外在表现为与社会进行资源交换的程度。治理机制的“行政化”和发展定位的“同质化”是影响地方大学适切性的主要因素。