浇铸尼龙—6的结晶与熔融

用ＤＳＣ法研究了Ｌａ２Ｏ３和Ｙ２Ｏ３对浇铸尼龙－６（ＭＣ尼龙－６）结晶与熔融的影响，二者都使ＭＣ尼龙－６熔体等速降温的结晶温度Ｔｅ升高，等速升温的溶点Ｔｍ降低，结晶度Ｘｃ降低，拉伸过程的断裂能密度及断裂伸长率提高，Ｌａ２Ｏ３使ＭＣ尼龙－６平衡熔点Ｔｍ降低，结晶速率增加，结晶完善程度变差，Ｙ２Ｏ３使ＭＣ尼龙－６的Ｔｍ升高，它可显著改善ＭＣ尼龙－６的耐热性。     

无活化剂存在时己内酰胺碱催化聚合及高延伸铸型尼龙的制备

研究了在无活化剂存在时己内酰胺的碱性催化聚合反应。实验结果表明当聚合温度在190—220℃范围时制备的铸型尼龙其断裂伸长率在200％以上,最高达363％。并具有高耐冲击性能。与一般铸型尼龙相比较,该高延伸铸型尼龙具有较低的抗张强度、弹性模量、熔点、玻璃化转变温度、密度和结晶度。     

Chemical structure and glass transition temperature of non-ionic cellulose ethers

New zinc(II) propionate complexes (CH₃CH₂COO)₂Zn·Ln·xH₂O, where n=1-2, x=0 or 2, were prepared by reaction of zinc(II) propionate with heterocyclic ligands (L=theophylline, nicotinamide, methyl-3-pyridyl carbamate) and their thermal properties were studied. The prepared complex compounds were characterized by elemental analysis and IR spectra. TG/DTG and DTA measurements of the prepared compounds were performed in the air atmosphere under dynamic conditions. The thermal decomposition can be characterized as a multi-step process. The first step is attributed to the elimination of water or N-donor ligand molecules. It is followed by the decomposition of propionate anion when diethyl ketone and carbon dioxide were released. Zinc oxide was found as a final product of the thermal decomposition of the complex compounds under study. The volatile intermediate products of the thermal decomposition of zinc(II) propionate complexes were identified by IR-spectroscopy, qualitative chemical analyses and final solid product by X-ray powder diffraction method. Moreover, IR spectra suggest monodentate coordination of propionate anion to zinc. The complexes were tested against bacteria and filamentous fungi and show both antimicrobial activity and fungistatic effect towards pathogens as well as probiotic activity towards Lactobacillus paracasei.     

有机/无机复合材料吸附分离CO2的模拟研究

从烟道气中分离二氧化碳对于降低大气温室效应具有极其重要的意义。构造了由聚合物6FDA-1,5-NDA和多孔性二氧化硅组成的有机/无机复合材料吸附剂模型,并用GCMC方法模拟了烟道气[n（CO2）：n（N2）=15：85]在该材料中的吸附行为。结果表明,这种复合材料吸附剂对CO2的吸附量和选择性随着聚合物含量的增加而增加。在相对较低的温度下,复合材料吸附剂对CO2的选择性随压力的升高而缓慢下降,并趋向于一个平衡值;在高温下,吸附剂对CO2的选择性基本不随压力变化。在一定的吸附压力下,CO2和N2的吸附量均随温度的升高而快速下降,但CO2吸附量下降幅度比N2快,导致吸附剂对CO2的吸附选择性随温度的升高而下降。     

汽车空调模糊控制系统设计研究

汽车空调在各种汽车中逐渐普及,控制方式通常是人工手动,无法满足驾驶舒适性和降低能耗的现代汽车要求。本文对传统的模糊控制算法进行优化,有效地提升了空调自适应控制能力。同时,设计了基于MC9S08SE芯片的硬件模块和软件模块。以某款中端汽车为测试平台,验证了系统的高性价比、有效性、低功耗性和自适应性等特点。     

基于MC9 S12 XS128的水温加热控制系统设计

本系统设计以温度传感器DS18B20[3]、电桥测重传感器和MC9S12XS128最小系统[2]为核心[1],使用220V AC电源加热水壶中的水。本设计具有温度测量功能、液位测量功能,可显示温度和液位数值。测温分辨误差不大于0.5℃,液位测量误差不大于5mm。具有液位上限、下限报警功能,可以设置报警点,液位低于下限或高于上限时,发出声音报警并禁止加热。具有分段程序控制功能,可分段设置控温值和保温时间,升温速度不小于10℃·min-1,控温误差不大于0.5℃。     

多视角三维数据场的构建研究

基于移动立方体（marching cubes,MC）算法,考虑到现实条件下观测数据的不完整性,提出一个方便模式识别研究的可伸缩三维数据场模型。该模型混合 MC 算法和分区域处理方法,考虑了多角度观测对场域及目标的影响,描述了三维数据场对模式识别的作用。场域建立的实践表明,利用多观测点互相补充的方法改进了 MC 算法,提高了运行效率。     

多约束水平运输问题的时间费用均衡

基于为顾客提供最佳服务的现代营销理念,剖析了从一定产地到一定销地所发生的运输问题,构建了时间用均衡的目标模式及多目标约束水平MC^2运输问题的数学模型,本文在建立一系列定义,定理的基础上,提出了认明时间费用均衡解空间的优化决策方法,并结合示例展现了这一方法在解决客观实际问题中的有效性。     

Effective Diffusivities of Point-Like Molecules in Isotropic Porous Media by Monte Carlo Simulation

Monte Carlo simulations of point-like molecules in random and structured media are used to determine and characterize the effective diffusion coefficients of the molecules in the media. Simulations were carried out in 2D and 3D media. Monte Carlo simulation results in 2D and 3D media are compared with those obtained by analytical techniques. Simulation results indicate that for the structured, isotropic media the effective diffusivities can be characterized according to percolation thresholds in addition to porosity. The effective diffusivities in two isotropic media with the same porosity but different percolation thresholds can differ significantly. The effects of dimensionality on the effective diffusivities can also be significant. It is shown that in general the effective diffusion coefficients obtained from 2D simulation are not a good approximation to those of 3D, especially when the percolation thresholds of the 2D media and the 3D media are very different.