压电超声微电机混合结构定子的固有频率特性分析

压电超声微电机是依靠定子振动变换能的功率器件，定子性能将直接关系到微电机能否实现，本文采用Ｒａｙｌｅｉｇｈ－Ｒｉｔｚ方法来分析机械中经常采用的多层膜结构（混合结构）定子的固有振动特性，推导中考虑了平面应力和弯曲应力对固有频率的影响，模拟计算和实验结果符合得较好，此外还讨论了定子有关参数对固有频率的影响。     

超微粒子的量子阻尼振动理论

根据SU(1,1)Lie代数,建立超微粒子的量子阻尼振动理论,得到超微粒子量子阻尼振动系统的能级和波函数。     

安钢三炼钢板坯漏钢原因分析

安钢三炼钢板坯连铸机是上世纪90年代后期引进的具有当今世界最先进水平的连铸机之一，在生产过程中由于操作、设备等因素造成多次漏钢事故，给生产造成极大危害，针对发生的多起漏钢事故，分析查找了漏钢的原因，制定了针对性措施，取得了良好的效果。     

一种工艺过程流体强化装置

介绍了一种提高工艺过程效率的强化装置,即通过在过程设备上设置振荡装置,使过程设备内的流体产生扰动,破坏流动边界层,使流体获得附加雷诺数提高流动的湍流程度,达到强化过程设备内工艺过程的目的。该强化装置的调节弹性大,适应范围宽。调节强化装置中转子的转速、几何尺寸、空间位置和方向等参数或更换挡板形式,就能适应各种工艺过程条件。该装置可用于传热、传质及化学反应等多种过程,以提高过程效率,节约能源和资金,减小设备体积,并可将机械搅拌类的间歇过程转化为连续过程。     

Temperature Oscillation Calorimetry: Robustness analysis of different algorithms for the evaluation of the heat transfer coefficient

Applicability of different temperature oscillation calorimetry algorithms, previously proposed in the literature, for the evaluation of the heat transfer coefficient during the course of the reaction, is analysed by referring to the experimental data from a methyl methacrylate polymerisation reactor.Results are coincident in the nominal case (no errors on data), while differences appear in the elaboration of real data. The effect of uncertainty in the experimental data has been simulated in terms of error on the amplitude and on the phase of reactor and jacket temperature profiles.This approach allows to indicate algorithms having the best robustness properties and to give an explanation of phase errors in terms of a lumped parameter which accounts for different phenomena, not included in the basic hypotheses of the method. Based on this observation, a procedure to eliminate this source of errors from experimental data is proposed for the more general algorithm presented to handle oscillating temperature profiles generated by different techniques.     

非对称复合材料层板在面内载荷作用下的非线性横向变形或屈曲

本文利用广义富里叶级数法对非对称复合材料层板在面内载荷作用下的非线性横向变形或屈曲问题进行了分析。文中主要研究了四边简支边界条件下,非对称层板的铺层方式和面内载荷形式对横向变形的影响。通过求解非线性控制方程得到了层板的载荷—挠度曲线或特殊情况下的后屈曲平衡曲线。计算结果表明,对于大多数非对称复合材料层板在面内载荷作用下所产生的是横向变形问题,而不是分叉屈曲问题。     

水布垭高砼面板堆石坝非线性和弹塑性分析

 主要介绍采用二维非线性和三维弹塑性有限元法对水布垭高砼面板堆石坝进行应力变形分析研究的成果。研究成果论证了设计方案的合理性和可行性。弹塑性模型由于能反映材料在高压应力条件下的剪缩特性，因而其成果更合理些。     

灯泡贯流式机组运行稳定性分析

电力系统自动发电控制（AGC）投入运行后,发电机组的运行方式由惯有的静态控制转变为动态控制,这对洪江水电站贯流式机组影响明显。运行环境变化后,该机组振动大、设备问题频繁。抓住机组稳定性的课题,从机组自身的结构特点着手,按静态、动态两种控制方式展开分析,阐述了贯流式机组运行稳定性“静态控制性能良好、动态控制相对较差”的论点,并进行了理论和现场实验的深化论证。     

钢结构稳定设计——理论与实践

本文提出了实际工程结构的非线性理论设计和分析方法(NIDA),并以澳门回归纪念馆的设计为例,展示了本方法的优越性.在设计过程中,设计者无需假设K系数和有效长度,在结构分析完成后便可迅速完成设计,因此本文提出的方法既经济又便利.尽管对于钢框架在往复荷载及动力荷载作用下的弹塑性大位移分析已经非常成熟,但本文的方法开创了结构的非线性分析及设计的新纪元,能够对现行的设计方法理论起到巨大的推动作用.     

Viscoelasticity of oxidized starch/low methoxy pectin mixtures in the presence of glucose syrup

The structural properties of mixtures of pectin, oxidized starch and glucose syrup were investigated using small deformation dynamic oscillation. In the absence of added calcium, preparations of low methoxy pectin with glucose syrup formed viscous solutions, which remained crystal-free at subzero temperatures. Samples of oxidized starch and glucose syrup, on the other hand, exhibited solid-like behaviour because of the crystalline nature of the amylose-like helices. Mixtures of the two polysaccharides with the co-solute clearly showed phase inversion from liquid to solid-like behaviour with increasing amounts of starch in the formulation. The transformation was reflected in the textural properties of samples, which varied from thick solutions to firm gels. The viscoelasticity of the system was modified further by the introduction of high methoxy pectin. Preparations of high methoxy pectin and glucose syrup formed rubbery gels whose amorphous nature underwent a glass transition during cooling.