常系数线性中立型微分方程周期解存在唯一的充要条件

本文利用Fourier级数讨论具有常系数的任意阶中立型泛函微分方程的周期解，除一种特殊情况外，我们得到了用有限代数方程组描述的周期解存在唯一性的充要条件，对这种特例，我们也得到了若干实用结果．     

用CCD测量单缝宽度的一种实验室方法

根据单缝夫琅和费衍射原理 ,介绍利用CCD测单缝宽度的一种实验室方法 ,并对测量误差等问题进行了讨论     

颗粒物质中熵力和组态熵的共振吸收力学谱研究

利用研制的切变波共振吸收力学谱仪测量了颗粒物质(种子、不锈钢珠)的共振吸收力学谱，发现系统的共振频率具有明显的切位移振幅效应，同时颗粒物质存在特征共振吸收峰。从这些结果，可以算出颗粒物质的熵力及熵能级差。     

介观耗散互感耦合电路的库仑阻塞效应

给出了介观耗散互感耦合电路的量子化方法,并在介观电路中电荷量子化的基础上给出了介观耗散互感耦合电路的库仑阻塞条件.     

PET-云母复合体系的双重Tg转变

本文用粘弹谱仪、x射线衍射、DSC研究了PET—云母复合物的Tg区域的多重转变等松驰转变行为,探讨了加工、云母填充对PET—云母材料性能影响的分子运动机理。不同热历史(如不同成型条件、热处理等)使聚合物分子形成不同链段运动;处于高温位的Tg(u)其运动单元是受结晶、内应力、填料作用影响的非晶区链段。     

A new model for the life prediction of GH4133 under TMF conditions

Thermal mechanical cyclic strain tests were carried out under in-phase and out-of-phase conditions on a Nickel-base Superalloy GH4133 in the temperature range of 571-823℃. Based on analyzing the present models of TMF (thermal mechanical fatigue) life prediction, a new model for predicting nickel-base superalloy TMF lifetime was proposed.TMF life of superalloy GH4133 was calculated accurately based on the new model. Experimental TMF life has been compared with the calculatedresults and all results fall in the scatter band of 1.5. The calculating results show that the new model is not only simple, but also precise. This model will play great roles in life prediction of the metal materials and the engineering components subjected to non-isothermal service conditions.     

三峡钢丝绳卷扬全平衡式垂直升船机机电耦合系统动力学仿真

建立三峡钢丝绳卷扬全平衡式垂直式升船机的双闭环调速电力拖动控制系统的模型和升船机各子结构的动力学模型，并通过刚性子结构法形成了整体动力学模型，运用MATLAB中的SIMULINK模块，将电力拖动控制系统与整体动力学模型耦合，采用Wilson-θ法求解瞬态响,对误载水深为＋20cm，承船厢低点位置上向上启动运动的正常工况进行了仿真分析。     

Using Oil Analysis to Study the Wear Condition of Bearing in Trunnion of Convertor During/After Run-in Period

1Introduction Convertorisoneofthemainequipmentofsteel making.Thebearingsinthetrunnionofconvertorarecharacterizedby low speed,heavy loadandhuge dimension.Theyrevolve slowlywhenmoltensteelisaddedoremptied.Theirlife expectancyis20years.Incasetheyexperiencefailurein operation,theoutputoftheconvertorandeventhatofthe wholeproductlinewouldbeaffectedandhugelosswouldbe resultedin.Therefore,itisveryimportanttomasterthe workingconditionsofthebearings.Vibrationandoilanalyses aretwomaintechniquestomonito…