A new efficient numerical method and the dynamic analysis of composite laminates with piezoelectric layers

Firstly, a numerical method for the inversion of Laplace transform is developed and its accuracy is shown through examples. Then, a state-vector equation for the dynamic problems of piezoelectric plates is deduced directly from a modified mixed variational principle for piezoelectric bodies and its exact solution for the dynamic problems of simply supported rectangle piezoelectric plate is simply given. For multilayered hybrid plates, we derive the solution in terms of the propagator matrices. The techniques accounts for the compatibility of generalized displacements and generalized stresses on the interface both the elastic layers and piezoelectric layers, and the transverse shear deformation and the rotary inertia of laminate are also considered in the global algebraic equation of structure. Meanwhile, there is no restriction on the thickness and the number of layers. As an application of the numerical inversion of Laplace transform presented in this paper, typical numerical examples of the harmonic vibration and transient response are proposed and discussed. Since the highly accurate numerical results, they can serve as benchmarks to test various thick plate theories and various numerical methods, such as the finite and boundary element methods for transient response problems.     

辽宁省大石桥市后仙峪硼矿区成矿特征

后仙峪硼矿区地表大多为混合花岗岩覆盖。从前人们认为该岩石为岩浆岩，其下不可能存在硼矿床。通过近年对该岩石的研究分析，以及野外工作我门认为该岩石为正常地层，并经钻探验证在该岩层下发现了隐伏硼矿体。     

乙烯裂解炉对流段局部结构设计改进

介绍了乙烯裂解炉对流段的结构功能,各部件局部结构的改善设计。     

Stokes问题一个矩形非协调元逼近

提出了一个新的矩形非协调混合元格式,把它应用于Stokes问题的数值逼近,得到了最优的误差估计.     

混合C=9制备壬基酚的研究

研究了以强酸性阳离子交换树脂为催化剂，以混合C9^=为原料制备壬基酚的工艺条件及树脂的再生方法，并考察了催化剂及再生剂的使用寿命。结果表明，混合C9^=可用于制备壬基酚，在110℃、苯酚与C9^=物质的量比为2．5、催化剂与C9^=质量比为30％的条件下连续反应64h，C9^=平均转化率达到85．9％，催化剂可反复多次再生使用，并具有较长的使用寿命。     

联合循环余热锅炉螺旋鳍片管烟气放热系数研究

东南大学建造了1座IGCC余热锅炉鳍片管受热面流动和传热热态试验装置,并先后在其上进行了2个不同螺旋鳍片管组的传热特性研究,通过分析比较实测的烟气侧对流放热系数与无量纲准则式计算的结果,得出了完全热模拟公式更为准确的结论。     

绢麻交织绸的研究与开发

采用83×2dtex(120N/2)绢丝纱和417dtex(24N/1)亚麻纱交织,生产国际市场流行的服装面料,分析总结了这一新产品的生产工艺与条件。     

Accumulation and Mixing of Oils in Jinghu Sag of Subei Basin： Constraints from Thermal Maturity Parameters

Oils in Jinghu sag are abundant with high content of polar compounds and have a low ratio of saturate to aromatic hydrocarbons and a high ratio of resin to asphaltene. The gross composition of oils in the Jinghu sag suggests typical immature to low mature characteristics. Some compounds with low thermal stability were identified. Light hydrocarbons, a carbon preference index, an odd even index, n-alkane and hopane maturity parameters show mature features and little differences in the maturity level among oils. Sterane isomerization parameters indicate an immature to low mature status of oil. Transfer of the sedimentary center during sedimentation has led to different thermal histories among subsags and thus generated oils with different maturities. On the basis of source analyses, four migration and accumulation patterns with different maturity can be classified. Combined with available information on mergers of source, reservoir and long distance oil lateral migration, mixing conditions were present in the Jinghu sag. Experimental results indicate that maturity variations are caused by mixtures of hydrocarbons with different maturity.     

Electrical and optical properties of MoO3-V2O5 mixed oxide films

Vacuum deposited MoO₃-V₂O₅ films of different molar concentrations have been used for DC electrical conductivity studies at different temperatures. The optical absorption spectra of MoO₃-V₂O₅ films of different molar concentrations have been measured. From these measurements it is found that optical band gap and activation energy vary with molar concentration of MoO₃-V₂O₅ films.