跨国供应链环境下的批量订货模型

针对当前供应链批量订货模型研究的不足,提出了跨国供应链环境下的非线性混合整数规划批量订货模型。与以往研究不同,除了传统的决策变量——订货次数外,模型的决策变量还包括转移价格和运输成本分配因子,目标函数为跨国供应链税后利润最大化。由于模型属于NP难题,求解不便,根据问题的具体特点将其转化成为若干个线性规划模型,然后利用MATLAB的优化工具箱进行了数据分析,计算结果表明,转让价格和运输费用分配的调整对跨国供应链最优订货批量及税后利润具有显著影响。     

非线性电阻网络分段线性模型的区间表示

本文提出了非线性电阻网络分段线性模型的一种表示方法——区间表示法,定义了这种表示法的某些运算,并给出运算规则及应用。     

快装箱箱板的蠕变非线性分析

利用ANSYS建立了快装箱箱板的蠕变模型,对快装箱箱板在受力情况下的蠕变非线性分析过程进行模拟,得到了蠕变应变-时间曲线,从而验证了快装箱箱板材料的蠕变特性,为快装箱的强度设计和计算最长堆码时间提供了可靠的依据。     

固定床一维对流-扩散-非线性反应方程的数值解析

考虑内扩散和化学反应联合控制时的情况,将单一固体颗粒的综合速率方程推广到微元体,导出了化学反应项的更适用形式,建立了一维对流-扩散-非线性反应数学模型,求出了该模型的数值解,并以铁矿石的间接还原为例,讨论了不同条件下的反应转化进程. 结果表明,颗粒大小、对流是影响反应转化的重要因素,其影响程度可用Thiele数和传质Pe*数衡量. 由于Thiele数y与反应器长度的平方成正比,而传质Pe*与反应器长度成正比,因此反应器长度也是影响其自身性能的重要因素. 当比值y/Pe*增大时,对流作用下降,气体转化率增高.     

带交叉钢筋异形截面短柱抗震性能试验研究及非线性分析

提出带暗柱异形截面短柱和带交叉钢筋异形截面短柱。通过3根Z形短柱抗震性能的试验研究,分析比较了Z形柱在两个工程轴受力方向的承载力、延性、滞回曲线和破坏特征,分析了暗柱对提高Z形短柱抗震能力的作用。进行了3根T形、3根十字形和3根L形截面短柱抗震性能的试验研究。试验表明,带暗柱异形截面短柱和带交叉钢筋异形截面短柱与普通异形截面短柱相比,承载力和延性明显提高,滞回曲线相对饱满,耗能能力增强。采用ANSYS程序对12根异形截面短柱进行了非线性有限元计算分析,计算结果与实测结果符合较好。     

松下 AG -HPX500 MC 摄像机在新闻素材远程传输上的应用

随着网络技术的不断发展，文字图片新闻通过网络这一媒介，已经实现了质的飞跃，媒体竞争力日益增强。在三网融合的大背景下，处于基层的县级电视台更加需要在新闻的时效性上下功夫，提高新闻的可看性和及时性。介绍利用松下AG-HPX500 MC摄像机进行新闻素材远程传输的探索与实践。     

边界条件对网壳结构稳定性的影响分析

利用ANSYS软件,从周边刚性支座、周边铰支座、12点支承刚性支座及12点铰支座等方面分析了边界条件变化对网壳结构稳定性的影响,并结合实际的工程设计,给出了合理的建议。     

Coupled electromagnetic wave propagation in a cylindrical dielectric waveguide filled with Kerr medium: nonlinear effects

Propagation of the coupled electromagnetic wave, which is a superposition of TE and TM waves, in a dielectric circular cylindrical waveguide filled with non-linear inhomogeneous medium is studied (if the permittivity is linear, the coupled wave does not exist). Non-linear coupled TE–TM wave is characterized by two (independent) frequencies and two (coupled) propagation constants (PCs). The physical problem is reduced to a non-linear two-parameter transmission eigenvalue problem for Maxwell’s equations. The system of dispersion equations with respect to PCs is derived and solved numerically. Two types of coupled PCs and coupled guided modes are found: non-linear solutions of the first type become solutions of the corresponding linear problems as the nonlinearity coefficient tends to zero; solutions of the second type seem to be ’purely’ non-linear as they stay away from any linear solutions as coefficient of the nonlinearity tends to zero. Coupled PCs and coupled eigenmodes are calculated and plotted.     

Enhancement of nonlinear optical susceptibility of CuPc films by ITO layer

In the present study, the Copper Phthalocyanine (CuPc)/ITO thin film was fabricated using thermal evaporation method. The structural property was analyzed by X-ray diffraction study and confirms that the thin film has been preferentially grown along (200) plane. The atomic force microscope study was carried out on deposited film and quality of thin films is assessed by calculating the roughness of the films. The direct and indirect band gap, linear and nonlinear optical characteristics of grown films were calculated by using UV–Vis–NIR spectrometer studies. The calculated values of the first direct and indirect band gaps (E_g1(d) & E_g1(ind)) are 1.879 and 1.644 eV as a fundamental gap, while the values of second direct and indirect band gap (E_g2(d) & E_g2(ind)) are 1.660 and 1.498 eV as an onset gap for CuPc. The values of nonlinear refractive index (n₂) and third order nonlinear optical susceptibility (χ³) are found to be 5 × 10⁻⁸ and 8 × 10⁻⁹ (theoretical) and 5.2 × 10⁻⁸ and 1.56 × 10⁻⁷ (experimental) respectively. The optical band and third order nonlinear properties suggest that the as-prepared films are may be applied in optoelectronic and nonlinear applications.     

New Algorithms of Control and Observation of the Induction Motor Based on the Sliding-Mode Theory

In this article new algorithms are developed for controllers of speed and flux and non-linear observer’s of induction motor’s. These new algorithms are based on the sliding-mode theory. The use of the non-linear sliding mode method provides best performances for motor operation and robustness of the control law despite the external and internal perturbations. To prove the accuracy of the results, validation is made with Adnan’s experimental results. Later a parametric study is presented to evaluate the speed and flux variation according to the increase in time for both open and closed loops. From the parametric study, it should be noted that the variation of the electrical parameters does not affect the stability of the system. Finally, it is concluded that results of the developed algorithms showed an excellent stability of the system confirmed by best quality numerical simulations.