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。     

体外预应力加固钢梁桥的设计计算

对体外预应力加固简支钢梁桥时体外预应力筋的线形布置、预应力损失以及内力增量的计算进行了分析，提出了体外预应力加固简支钢梁的设计计算方法，并采用该方法对一模型梁进行了加固设计计算，且与模型梁的实测值进行了比较，结果符合较好，表明该方法可行，并具有较高的准确性．     

A New Method on Resolving the Rotation in the Plane of Skew Bridges

0IntroductionSkhiegwh wbariyd.g eHso awreev eorf t,etnhe a pinplhieerden otn di smaudnviacniptaalge r ooafd s kaenwdbridges ,i .e.the rotation in the plane always exists . Alongwiththe displacement growth,the girder will rotate and evencause cracks ,the e…     

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.     

既有钢桥工作状态模拟与剩余寿命评估

为评估既有钢桥的剩余寿命与使用安全,首先要建立能够精确模拟桥梁目前使用状态的工作模型,以准确计算桥梁中疲劳细节应力。在对桥梁交通荷载进行调查统计分析的基础上,建立能代表真实运营状况的车辆交通荷载谱,从而实现结构所承受荷载历程的模拟。以京九线南昌赣江桥为例,概要介绍既有钢桥工作模型与铁路列车荷载谱的建立,以及疲劳剩余寿命的评估结果。实例研究表明,为保证既有钢桥疲劳剩余寿命评估的可靠性,对结构工作状态和荷载谱进行精确模拟是十分关键的。     

装有动力吸振器的汽车悬架性能分析

针对普通被动悬架提高平顺性与提高轮胎接地性之间存在的矛盾，引入装有动力吸振器的悬架给出了动力吸振器参数选择的方法，分析了装有动力吸振器汽车悬架的幅频特性和时域性能，并与不装动力吸振器的普通被动悬架进行对比．结果表明装有动力吸振器的汽车可以较好地改善在高频段车身的剧烈振动和轮胎的接地性．