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Hegang Ren,김일,Min Yang,Baojun Zhang,Xiaofei Ren,Binyuan Liu,Yanji Wang 한국고분자학회 2012 Macromolecular Research Vol.20 No.9
1-Butene polymerizations were carried out by using a MgCl2/TiCl4/ID-AlR3/ED catalyst system in n-hexane,therein the internal donor (ID) is diisobutyl phthalate (DIBP), the external donor (ED) is diphenyl dimethoxysilane (DDS) or cyclohexyl methyl dimethoxysilane (CHMMS), and the AlR3 activator is AlEt3 or Al(i-Bu)3. The effect of the molar ratio of DIBP/Mg and polymerization conditions on the catalytic activity and the isotactic index (II) of poly(1-butene) (PB) was investigated. The dosage of DIBP remarkably improved the catalytic activity and the II of PB. CHMMS was more effective than DDS for increasing the II of PB. The addition of a small amount of hydrogen enhanced the catalytic activity from 15.1 to 17.5 kg-PB·gTi-1 and the II value of PB from 89.3% to 95.1%. The mixture of AlR3 was beneficial to increase the catalytic activity with negligible effect on the isospecificity.
Bio-inspired Micro Pump Model Based on the Movement Pattern of Sperm
Feifei Liu,Xiaofei Ren,Shoushui Wei,Zhiping Liu 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.11
Micro pumps play important roles in microfluidic system. Biologically inspired actuation mechanisms have great advantages in the micro pump design. This work aims to develop a numerical model for bio-inspired micro pump based on the specific and genuine movement pattern of the sperm. The model also employs a modified immersed boundary-lattice Boltzmann method. In the model, an elastic film is used to mimic a sperm moving with its head fixed. The fluctuation vibration of the film could then drive the static fluid to move. The modified immersed boundary-lattice Boltzmann method directly introduces the velocity information of the film into the traditional lattice Boltzmann equation, which improve the computational efficiency. Pressure distribution, streamlines and the flow rate curves are used to analyze the flow field dynamic process of the model. The effects of the model parameters (e.g. frequency, kinematic viscosity, amplitude and wavelength) on the stable flow rate are also studied comprehensively.
Typological Evolution of High-Rise Buildings in Terms of Thermodynamics and Energy Formation
Li, Linxue,Shen, Xiaofei,Qian, Ren Council on Tall Building and Urban Habitat Korea 2015 International journal of high-rise buildings Vol.4 No.2
High-rise buildings are frequently criticized for their absolutely artificial environments and high energy consumption. This paper tries to present an alternative approach to, and new prototypes for high-rise buildings through dialectic reconsideration of the responsive relation between high-rise buildings and environmental elements, in terms of thermodynamics and energy formation.