环槽形内侧凹塑件注射模设计

在分析环槽形内侧凹塑件结构特点及模具设计方案的基础上,设计了此类塑件的注射模.着重介绍了模具的结构及工作过程.巧妙地利用滑块与斜滑块联合抽芯机构解决此类塑件的脱模难题.     

实用M2052合金阻尼行为表征

名义组分为Mn-20Cu-5Ni-2Fe(原子分数，％)的M2052合金，具有很高的强度和阻尼性能．对该合金在不同条件下的阻尼性能采用多种方法进行了表征．该合金的高阻尼态出现在一个临界温度以下，该温度可以通过改变组分和热处理来调整．合金的室温阻尼性能强烈地依赖于频率、应变振幅以及静载荷的大小．     

下喷式环流反应器环隙气含率影响因素

下喷式环流反应器是一种用于强化气-液两相反应过程的新型装置，虽然已在工业上有了较广泛的应用，但对其理论研究远未成熟，其工业装置的设计仍依赖于实验和经验。本文借助实验室自制实验装置，对下喷式环流反应器环隙气含率的影响规律进行了研究。首先，对喷射器的吸气量进行了测量，获得了不同条件下喷射器最大吸气量的性能曲线；在此基础上，分别研究了气相流量、液相流量以及喷射器安装位置对环隙气含率的影响规律。结果表明：气相流量和液相流量对气含率具有重要的影响，随着气相流量和液相流量的增大，气含率快速提高，而喷嘴位置对气含率的影响相对较小；考虑到增加气相流量和液相流量所需要的能耗和设备代价，通过增加液相流量来达到提高气含率的目的是优选方案。     

PVC基阻尼涂料的制备及其流变性能

以聚氯乙烯（PVC）为基体，对苯二甲酸二辛酯（DOTP）为增塑剂，与无机填料CaCO3、钙锌热稳定剂、乳化剂OP-10、润滑剂液体石蜡等复合改性制备PVC基阻尼材料，采用动态流变仪DHR、动态热机械分析仪DMA、扫描电镜SEM等对试样的性能和形态进行表征。运用正交设计探究各组分对性能的影响规律，结果表明，填料CaCO3和增塑剂DOTP比例对其阻尼性能影响最显著；当PVC: CaCO3: DOTP: OP-10比重为45: 33: 22: 2时，25℃时频率0.01～150 Hz范围内，tan δ最大值从0.497提高到0.604；剪切速率0.1 s-1时表观黏度为3738 Pa·s，剪切速率150 s-1时表观黏度为2.19 Pa·s，具有优异的抗流挂性与稳定性。通过LASD形态分析构建微观聚集态模型，提出刚性填料团聚-解团聚和聚合物微球变形对流变性能的作用机理，为LASD的持续研究提供技术思路和理论基础。     

SEQUENTIAL LOOP CLOSING IDENTIFICATION OF MULTIVARIABLE PROCESSES USING THE BIASED RELAY FEEDBACK METHOD

Each controller in multiloop control systems for multivariable processes can be tuned sequentially with the ultimate information for the paired input and output while former loops have been closed, and hence, single-input single-output autotuning methods can be applied. In this sequential autotuning for multiloop control systems, several iterations are usually required for better control performances. Especially when pairings are undesirable, the autotuning sequences should be repeated with correct pairings, which result in long field experiments. Here, to avoid this drawback, a simple method to identify process models while loops are being sequentially tuned is proposed. The identified models can be used to correct pairings of multiloop control systems and to improve tuning performances without several field iterations. In addition, they can be used to obtain model-based control systems such as decoupling control systems.     

气升式环流反应器的特性及应用

综述了气升式环流反应器的特性及其主要影响因素研究,简要介绍了这种反应器的应用情况,并提出了今后研究工作的方向。     

固体颗粒对三相气升式环流反应器流动特性的影响

将液相视为连续相,气相和固相视为分散相,同时考虑各相之间的相互作用,结合气液固三相流体的动力学理论,建立气液固三相环流反应器三流体湍流流动的Eulerian模型.采用计算模拟软件Fluent对三相环流反应器的流动状况进行模拟,考察表观气速、固含率、颗粒大小对反应器的气含率以及液体流动速度的影响.模拟结果较好地解释了气升式环流反应器内的三相流体行为,模型与实验结果较好地吻合,表明了模型的可行性.     

Effect of miscibility and forced compatibility on damping properties of CIIR/PAc blend

In this study, a kind of novel damping materials was prepared based on the blend of chlorinated butyl rubber (CIIR) and polyacrylate (PAc) synthesized by different molar ratio of butyl methacrylate and ethyl acrylate. Research results from experiments and analyses by employing DMA, TEM, and FTIR show that whether at a cocured system or noncocured system, it can be achieved to shift a loss peak of CIIR towards a higher temperature region and to keep the damping value from markedlly decreasing, which broadens the effective damping function area of CIIR to the vicinity of ambient temperature. In the former system, the thermodynamical miscibility of CIIR and PAc, to some extent, is predominated by the molecular design of PAc, while in the latter system, covulcanized networks play a more significant role in improving compatibility and abating the peak split, though the suppression effect of thermal stress on the transition of CIIR T_ll transition still can not be neglected. Furthermore, transition state derived from the cocuring CIIR and PAc cannot make the phase separation completely take place, and consequently results in the deformation of phase morphology of the cocured CIIR/PAc blend. It is the influence of thermodynamics miscibility and forced compatibility in different size that makes the suppression effect of foreign PAc on CIIR T_ll transition be controllable. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 3127–3133, 2006     

DQ型高效催化剂在环管PP装置上的应用

介绍了使用DQ型球形高效催化剂在上海石油化工股份有限公司塑料事业部70kt/a环管连续法工业聚丙烯生产装置上应用研究的结果，并对结果进行了讨论。     

有机杂化阻尼材料动态力学性能的影响因素探讨

高分子阻尼材料作为一类环保功能材料,将向高性能、宽温域的方向发展。传统的阻尼改性方法(如共混、共聚、无机杂化等)及近年来发展起来的互穿聚合物网络和添加压电陶瓷等研究手段都存在一定的局限性。新近开发的利用有机小分子与极性高聚物形成杂化体的方法所得到的阻尼材料的性能非常突出,是一种很有前途的阻尼改性新方法。本文在对现有的二元、三元杂化体系进行分析对比的基础上,对影响有机杂化阻尼材料动态力学性能的因素进行了探讨,为今后该领域的研究工作提供参考。