高分子科学实验教学改革初探

设想将高分子化学、高分子物理和高分子成型加工三门实验课程有机地串联起来,组建成一门包括从高分子材料设计(用计算机软件进行分子设计、性能模拟)、聚合物合成、性能测试(物性表征)到加工成型(制作成高分子材料制品),能环环相扣、互动式的、柔性化的高分子科学实验课程;提出了初步的实践方案.     

扬长避短构建和谐数学教学的多媒体课件

现阶段数学教学课件中存在拿来主义、缺乏再创造,单边主义、缺少交流与协作,泛泛主义、没有针对性等问题.要构建和谐数学教学多媒体课件,可视性、可读性、可赏性、实用性是课件制作要考虑的重要因素.     

Aerodynamic interaction between forewing and hindwing of a hovering dragonfly

The phase change between the forewing and hindwing is a distinct feature that sets dragonfly apart from other insects.In this paper,we investigated the aerodynamic effects of varying forewing-hindwing phase di ff erence with a60 inclined stroke plane during hovering flight.Force measurements on a pair of mechanical wing models showed that in-phase flight enhanced the forewing lift by 17%and the hindwing lift was reduced at most phase differences.The total lift of both wings was also reduced at most phase di ff erences and only increased at a phase range around in-phase.The results may explain the commonly observed behavior of the dragonfly where 0 is employed in acceleration.We further investigated the wing-wing interaction mechanism using the digital particle image velocimetry（PIV）system,and found that the forewing generated a downwash flow which is responsible for the lift reduction on the hindwing.On the other hand,an upwash flow resulted from the leading edge vortex of the hindwing helps to enhance lift on the forewing.The results suggest that the dragonflies alter the phase di ff erences to control timing of the occurrence of flow interactions to achieve certain aerodynamic effects.     

计算机辅助教学在物理实验教学中的运用

本详细阐述了计算机辅助实验教学的成功经验，给出了计算机处理模拟物理实验讨论。     

"高分子物理"的问答式互动教学

阐述一种新颖、有效的“高分子物理”课程教学方法 :以问答的方式 ,层层递进、互相联系 ;既能突出重点 ,又可以将教学内容组织成一个有机网络。这种方式利于互动教学 ,提高学生的参与度 ;也便于学生由一系列问题联想起许多具体细节 ,避免死记硬背 ,以收融会贯通之效。     

The conformational preferences of γ-lactam and its role in constraining peptide structure

Summary The conformational constraints imposed by -lactams in peptides have been studied using valence force field energy calculations and flexible geometry maps. It has been found that while cyclisation restrains the of the lactam, non-bonded interactions contribute to the constraints on of the lactam. The -lactam also affects the (,) of the residue after it in a peptide sequence. For an l-lactam, the ring geometry restricts to about-120°, and has two minima, the lowest energy around-140° and a higher minimum (5 kcal/mol higher) at 60°, making an l--lactam more favourably accommodated in a near extended conformation than in position 2 of a type II -turn. The energy of the +60° minimum can be lowered substantially until it is more favoured than the-140° minimum by progressive substitution of bulkier groups on the amide N of the l--lactam. The (,) maps of the residue succeeding a -lactam show subtle differences from those of standard N-methylated residues. The dependence of the constraints on the chirality of -lactams and N-substituted -lactams, in terms of the formation of secondary structures like -turns is discussed and the comparison of the theoretical conformations with experimental results is highlighted.     

高分子科学基础实验的互串互动教学初探

提出将高分子化学实验、高分子物理实验以及加工测试有机地串联起来,成为一门环环相扣、便于互动教学的高分子科学基础实验课的初步设想。     

求解离散多准则决策问题的一种交互法

本文在 [1 ]的基础上发展了一种求解离散多准则决策问题的交互法 ,并举例说明其具体应用情况     

An Interactively Coupled CFD-Multi-Zone Approach to Model HCCI Combustion

The objective of this work is to present an innovative interactively coupled CFD-multi-zone approach. In a consistent manner, the approach combines detailed flow field information obtained from CFD with detailed chemical kinetics solved in a multi-zone model. Combustion and pollutant formation in an HCCI engine with recompressing VVA strategy are numerically investigated using the interactively coupled CFD-multi-zone approach. A surrogate fuel for gasoline is used in the simulation that consists of n-heptane (18% liquid volume fraction) and isooctane (82% liquid volume fraction). The underlying complete reaction mechanism comprises 482 elementary reactions and 115 chemical species. The interactively coupled CFD-multi-zone approach shows to be accurate enough to describe HCCI chemistry, and is at the same time economical enough to allow application in an industrial environment. For the test case investigated, the simulation results are compared to experimental data that has been obtained using real gasoline. The overall agreement between simulation and experiment is found to be very good. Based on the work presented at the 2^nd ECCOMAS Thematic Conference on Computational Combustion, Delft, The Netherlands, 2007.