Electrical and optical characterization of Na: CuInS2 thin films grown by spray pyrolysis

The structural, electrical and optical properties of Na-doped CuInS₂ thin films grown by spray pyrolysis were studied. These films crystallized in the sphalerite structure of CuInS₂, and showed to contain traces of indium sulfide and CuIn₅S₈ as impurity phases. All films were In-rich and showed p-type conductivity. The film conductivity was strongly affected by Na-doping, which decreased from 10⁻² to 10⁻⁵ S/cm by increasing the [Na]/[Cu] ratio from 0.005 to 0.03 in the spray solution. The band gap energy was observed to increase, from 1.4 to 1.45 eV, with increasing the [Na]/[Cu] ratio. Our results suggested that Na could be an effective acceptor impurity in sprayed CuInS₂.     

Anomalous Thermal Expansion in Superconducting Mg1− x Al x B2 System

The thermal lattice expansion in the superconducting Mg_{1? x} Al _x B₂ system (x = 0, 0.13, and 0.59) has been measured using high-resolution X-ray powder diffraction. An unusual large negative thermal expansion (NTE) appears for temperatures below T ^* = 60 K in the MgB₂. The NTE effect increases in Mg_0.87Al_0.13B₂ and disappears at high Al content in the Mg_0.59Al_0.41B₂ where the temperature dependence of volume follows a standard Einstein model in the whole temperature range. The anomalous behavior of the thermal expansion provides a direct evidence in the physics of diborides for the relevance of the proximity to the 2.5 Lifshitz electronic topological transition where the Fermi surface of the σband changes from a two-dimensional (2D) to a three-dimensional (3D) topology.     

Efficient system-level functional verification methodology for multimedia applications

Multimedia application design exploration should begin at the system level, to meet low-power and minimum-area requirements. Existing validation techniques mainly concentrate on lower abstraction levels. This system-level methodology combines formal verification of loop-oriented transformations with correctness verification of arithmetic constructs and related control flows. A videoconferencing-decoder example illustrates the methodology's efficiency.     

基于多智能体的新型遗传算法及其在复杂系统中的应用研究

通过对简单遗传算法及其研究现状的分析研究，及对复杂系统与简单遗传 算法特点的比较分析，针对简单遗传算法的不足，提出了一种基于多智能体的新型遗传算法，定义了新型遗传算法中的环境、智能体结构、遗传算子、目标/评估函数和流程图，最后用一个测试函数和复杂环境下的多峰函数对它进行了验证分析. 结果表明，新型遗传算法具有明显的优点和优势，特别适合于复杂系统中的问题求解．     

关于最佳鉴别特征维数问题的讨论

该文对最佳鉴别特征的最佳维数问题进行了详细的讨论．文章首先对最佳维数问题进行了界定，然后指出了两种最佳特征维数为c-1维的情况即以某些基于矩的可分性判据(准则函数)为优化目标的最优特征和以某些特殊的分类器错误率为优化目标的最优特征．最后该文运用方差分析法对最佳鉴别特征进行特征选择使之代入最小距离分类器后识别率最大．     

SWRM12冷镦盘条钢试制

阐述了SWRM12冷镦盘条钢试制情况，对采用连铸坯生产的冷镦盘条进行了综合分析检验，并经用户使用证明，该产品完全满足标准件生产要求。     

中间包包盖长寿综合技术的研究与应用

通过对武钢第一炼钢厂中间包包盖实际使用状况与破损形式的现场调研，分析了引起包盖破损的主要原因，制定了延长包盖使用寿命与改善包盖使用性能的综合技术措施，完成了高抗热震性莫来石-刚玉质浇注料的研究、长寿命中间包包盖的结构设计与工业性试验，取得了包盖寿命28个浇次的试验效果，强化了包盖的隔热防护作用，     

转炉冶炼终点炉渣氧化性和碱度的研究

通过在实验室电阻炉上的实验研究，得出了复吹转炉在吹炼含磷较高铁水时冶炼终点最佳的炉渣氧化性和碱度。实验结果表明，渣一钢反应接近平衡时，炉渣的氧化铁含量在15％左右，炉渣碱度m(CaO)／m(SiO2)为4．4，这时炉渣的脱磷能力最强。研究的结果对于复吹转炉冶炼的终点操作是非常有益的。