车辆座椅悬架用磁流变阻尼器的阻尼特性实验研究

在分析磁流变阻尼器的工作原理和简化模型的基础上,以座椅悬架用磁流变阻尼器为实验对象,在不同控制电流和不同激振频率输入下,对磁流变阻尼器的阻尼特性进行了台架实验研究。结果表明,该磁流变阻尼器耗能效果明显,而且阻尼力随着控制电流、激振频率的增加而增大,并趋于平衡。     

面向多约束的可举升复合油气悬架偏频优化

以空、满载状态下悬架偏频及空满载等频性作为平顺性评价指标,分析了可举升复合油气悬架结构参数对整车性能的影响.针对某军车可举升复合油气悬架结构参数与整车性能的匹配与优化进行了研究,以空、满载悬架偏频的平方和与空、满载悬架偏频差值的乘积为目标函数,以复合油气悬架结构参数为设计变量,以悬架边界条件,承载状况等为约束条件进行了优化计算,最后得出可举升复合油气悬架合理的参数匹配,既满足了设计要求,又能最大限度地提高整车平顺性.     

超细V-Al_2O_3悬浮液的流变性研究

测定了 ３００．６５ Ｋ 下超细 γ Ａｌ２ Ｏ３ 分散在水中的悬浮液的流变性。着重考察了γ Ａｌ２ Ｏ３ 含量、ｐ Ｈ 值和电解质对悬浮液流变行为的影响。在 ４０～５００ｓ－ １的较高剪切区，不同条件下测得的流变曲线均可用 Ｈ Ｂ 模型进行令人满意的关联，关联得到的稠度系数和流动特性指数能较好地反映γ Ａｌ２ Ｏ３ 含量和 ｐ Ｈ 值变化引起的颗粒表面电荷、颗粒间相互作用和悬浮液结构的变化。     

快速高吸油树脂的合成及吸油性能研究

文中采用分散聚合法合成甲基丙烯酸高碳脂肪醇酯共聚树脂，树脂收率可达９５％，并对其吸油性能进行了研究，平均吸油倍数对甲苯为２０倍，最快饱和吸油时间为１０５ａ。此外还研究了单体种类与比例，交联剂种类及用量、等对高吸油树脂吸油倍数与饱和吸油时间的影响。     

一类Lazer—Mckenna吊桥方程的周期解

通过Banach不动点定理。得到了关于Lazer-Mckenna吊桥方程分别在所谓对称和非对称无理周期边界条件之下解的存在唯一性定理。     

CuS-poly （N-isopropylacryl-amide-co-acrylic acid） composite microspheres with patterned surface structures： preparation and characterization

N-isopropylacrylamide (NIPAM) and acrylic acid (AA) copolymer microspheres with various compositions were prepared by reverse suspension polymerization technique. The microspheres thus prepared were employed as micro-reactors for the deposition of CuS. In this way, several CuS-P(NIPAM-co-AA) composite microspheres with different surface morphologies were prepared. It was demonstrated that the surface structures of the composite microspheres can be tailored to a certain extent by varying the ratio of the two monomer units in the template (microgels) and/or the amount of CuS deposited. It is in prospect that the inherent advantages of microgel templates (the size, composition, charge nature and density, and crosslinking density could be easily controlled) would make the microgel template method extremely useful in the preparation of composite microspheres with different patterned surface structures.     

气动人工肌肉主动悬架系统的可变自整定离散PID控制

构建以气动人工肌肉为新型执行器的车用主动悬架系统实验平台，为简化的基于1／4悬架模型的主动悬架系统设计了基于DRNN神经网络的可变自整定离散PID控制算法，分析了可变自整定离散PID算法的控制性能，为提高气动人工肌肉主动悬架系统的减震性能提供理论依据。     

Morphological Transformation of Plant Cells in vitro and Its Effect on Plant Growth

Enhancement of cell growth in suspension cultures is urgently needed in plant cell culture engineering. This study investigates the relationship between morphological transformation and cell growth in callus and suspension cultures of saffron cells belonging to the cell line C96 induced from Crocus safivus L In the suspension culture, an unbalanced osmotic pressure between the intracell and extracell regions induced a large morphological transformation which affected normal division of the saffron cells. An increase in osmotic pressure caused by the addition of sucrose inhibits the vacuolation and shrinkage of cytoplasm in the cells. As the sucrose concentration increases, the total amount of accumulated biomass also increases. Besides the sucrose concentration, increased ionic strength and inoculation ratio also help restrain to a large extent the vacuolation and shrinkage of the cytoplasm in the suspended cells, which results in increased biomass. The conditions for optimal biomass are： Murashige and Skoog＇s （MS） medium with 40 g/L sucrose and 60% （v/v） inoculation ratio.     

单分子层正癸酸包覆Fe_3O_4纳米粒子的研究

应用微乳液与 Fe2 + 和 Fe3 + 化学共沉淀的方法制备了正癸酸包覆的 Fe3 O4纳米粒子水基磁流体 .用光子相关光谱仪 ( PCS)、透射电镜 ( TEM)和 JDM- 3型振动样品磁强计对制得的水基磁流体进行了表征 .制备了单分子层正癸酸包覆的 Fe3 O4纳米粒子的固态样品 ,并利用 IR,TG,DTG与DSC考查了该固态样品的组成与性质 .发现用一步表面活性剂处理可以直接制得双层表面活性剂包覆的 Fe3 O4纳米粒子水基磁流体 .     

纳米修饰玻碳电极阳极示差脉冲伏安法测定盐酸异丙嗪

将亲脂性纳米材料单层地修饰于玻碳电极表面,在pH=7.3的磷酸盐缓冲溶液中,于0.0～1.0V(vsSCE)范围内对盐酸异丙嗪进行阳极示差脉冲伏安分析,在0.57V(vsSCE)处出现一灵敏的盐酸异丙嗪氧化峰.该峰电流可用于定量测定6.0×10-8～5.4×10-6mol·L-1浓度范围内的盐酸异丙嗪,检出限为2.0×10-8mol·L-1.与裸玻碳电极相比,由于表面MPCs(monolayerprotectedclusters)的疏水性,纳米修饰玻碳电极既可富集异丙嗪分子以提高检测的灵敏度,又能显著减少水溶性物质如抗坏血酸等的干扰,而且检测时无需除氧.实验对pH、MPCs组装时间、富集电位及时间、扫描速率等条件进行了优化.