微计算机控制的造波系统

本文所述系统可在水池中产生单一频率规则波、周期不规则波及"随机波",用于海洋、造 船工程的模型试验,采用频域迭代法和成型滤波器法来产生模拟海浪.尽管这一控制系统是 专为产生模拟海浪而设计的,但其控制方案也可直接用于其他测试技术领域,以产生"随机" 信号.     

利用最小熵法预测高频拓宽频带

本根据最小熵观点给出了预测高频成分拓宽频带的方法，实际效果表明，该方法是一种拓宽频带的有效方法。     

轮胎用钢丝帘线及在山东省的发展

介绍了钢丝帘线子午线轮胎的优点和国际上的发展情况。生产钢丝帘线的典型工艺及山东省的生产近况。     

Least mean p-power error criterion for adaptive FIR filter

An adaptive FIR filter based on the least mean p-power error (MPE) criterion is investigated. First, some useful properties of MPE function are studied. Three main results are as follows: 1) MPE function is a convex function of filter coefficients; so it has no local minima. 2) When input process and desired process are both Gaussian processes, then MPE function has the same optimum solution as the conventional Wiener solution for any p. 3) When input process and desired process are non-Gaussian processes, then MPE function may have better optimum solution than Wiener solution. Next, a least mean p-power (LMP) error adaptive algorithm is derived and some application examples are presented. Consequently, when the signal is corrupted by an impulsive noise, the adaptive algorithm with p=1 is preferred. Furthermore, when the signal is corrupted by noise or interference, the adaptive algorithm with proper choice of p may be preferred     

红外目标模拟器校准系统的研制与应用

采用标准辐射和红外目标模拟器的辐射交替折转进入红外光谱辐射计的方法，研制的红外目标模拟器校准系统可以对红外目标模拟器进行直接校准．该系统由标准准直辐射源，光束偏转装置和红外光谱辐射计组成．标准准直辐射源由工作温度为50℃～1050℃的标准黑体和口径300mm的离轴抛物面作主镜的准直光管组成．光束偏转装置由口径465mm的反射镜和定位精度5″的转台组成．红外光谱辐射计采用圆形渐变滤光片CVF对入射的辐射分光，3个光谱工作区间为1μm～3μm，3μm～5μm和8μm～14μm。3个区间的测试数据显示了最小可校准的光谱辐照度低于10^-11／cm^2，系统的相对标准不确定度为2％．     

多模复合制导数据融合器性能评估系统方案设计

从构建多模复合制导数据融合器性能评估系统的需求出发，详细介绍了多模复合制导数据融合器性能评估系统的构建方案，并从软硬件两个方面介绍了构建这样一个系统所需要注意的问题和解决办法．     

Generalized eigenvectors and fractionalization of offset DFTs and DCTs

The offset discrete Fourier transform (DFT) is a discrete transform with kernel exp[-j2/spl pi/(m-a)(n-b)/N]. It is more generalized and flexible than the original DFT and has very close relations with the discrete cosine transform (DCT) of type 4 (DCT-IV), DCT-VIII, discrete sine transform (DST)-IV, DST-VIII, and discrete Hartley transform (DHT)-IV. In this paper, we derive the eigenvectors/eigenvalues of the offset DFT, especially for the case where a+b is an integer. By convolution theorem, we can derive the close form eigenvector sets of the offset DFT when a+b is an integer. We also show the general form of the eigenvectors in this case. Then, we use the eigenvectors/eigenvalues of the offset DFT to derive the eigenvectors/eigenvalues of the DCT-IV, DCT-VIII, DST-IV, DST-VIII, and DHT-IV. After the eigenvectors/eigenvalues are derived, we can use the eigenvectors-decomposition method to derive the fractional operations of the offset DFT, DCT-IV, DCT-VIII, DST-IV, DST-VIII, and DHT-IV. These fractional operations are more flexible than the original ones and can be used for filter design, data compression, encryption, and watermarking, etc.     

职业道德建设的调查与思考

近年来各行各业加强职业道德建设,取得了一定成绩,涌现了一大批敬业爱岗、服务社会的岗位明星,但也存在着这样或那样的认识误区或现实局限,如形式主义、短期行为和领导观念异位等,这极大地阻碍了职业道德建设的深入推进。职业道德建设就其特征而言,它具有长期性、时代性和阶级性、相对稳定性以及创新性等属性,对此需要有一个理智而清晰的认识。应从营造良好的社会氛围、制定切实可行的道德准则、进行规范化的教育引导和发挥先进人物的示范作用等几方面入手,把职业道德建设推向深入。     

直齿圆柱变位齿轮的一种测绘方法

在工程实践中对损坏的无图纸齿轮进行重新制造时，测绘是必不可少的环节。在齿面已被严重磨损的情况下，如何准确地得到齿轮尤其是变位齿轮的各项参数是本文所着重讨论的问题。     

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.