基于改进型偏最小二乘法的高炉炼铁工序能耗预测方法

针对小样本环境下,具有自变量之间多重相关性特点的高炉炼铁工序能耗预测问题,从预测角度利用"舍一交叉"验证方法对偏最小二乘回归模型进行了改进,提出了应用改进型偏最小二乘回归建立预测模型的方法。以我国某钢铁厂高炉炼铁工序的能耗预测为例,说明了改进型偏最小二乘回归法与普通偏最小二乘回归法相比,预测误差平方和能够降低86.76%。     

一种无冗余的Web日志挖掘算法

Web日志挖掘是Web数据挖掘的一个重要研究领域。Web日志挖掘通过发现Web日志中用户的访问规律和模式,可以提取出其中潜在的规律和信息,人们对这个领域的研究也日益重视。然而,传统的基于关联规则的Web日志挖掘算法都是基于所有关联规则的。这种方式往往挖掘产生大量的候选规则,而且存在大量冗余的规则。提出了一种新的无冗余的Web日志挖掘算法,该算法通过引入频繁闭项集合最小关联规则的概念,从而解决了以往基于所有关联规则挖掘算法中出现的上述问题。     

人活化素结合蛋白的分离及纯化

为了进一步研究人活化素结合蛋白的免疫生物学活性，从人卵泡液中提取了活化素结合蛋白，采用亲和层析及高效液相层析法，最终获得35KDa，SDS－PAGE显示为一条带的人活化素结合蛋白，经免疫活性测定、激活素结合试验以及FSH分泌抑制试验证实，所纯化的人活化素结合蛋白为具有生物学活性的天然活化素结合蛋白，可供进一步的免疫生物学研究用。     

精密接插件注射成型工艺参数的优化设计

以某厂生产的精密塑件——电子接插件为例，通过分析该塑件体收缩变形和翘曲变形的原因，以正交试验为设计准则，利用Moldnow软件对各种工艺参数组合进行注射成型过程的模拟。研究表明，注射速率对体收缩变形的影响最为显著，而保压压力对翘曲变形起主导作用。并在正交试验的指导下优化工艺参数，使体收缩变形和翘曲变形分别降为原来的57．9％和85．6％，分析结果与生产实际吻合。     

Electrical resistivity of nickel-rich nickel-chromium alloys between 4 and 300 K

Electrical resistivity of Ni–Cr alloys containing 5.5, 11.3, 15.7, 16.8, 19.4, 22.0, 24.6, and 27.0 at % Cr has been measured as a function of the absolute temperatureT between 4 and 300 K. The sample with the Cr content of 22.0 at % exhibits a small minimum at about 10 K. No minimum has been observed in any other of the above samples, although an anomalousT dependence has been found in alloys containing 15.7, 16.8, and 19.4 at % Cr. The minimum has been discussed from the viewpoint of the Béal-Monod theory for the Kondo effect in concentrated systems and the mechanism by Greig and Rowlands based on aT-dependent decrease of the impurity electrical resistivity. It is concluded that the minimum in the Ni–Cr system is still a phenomenon which is not well understood at the present time.     

陶瓷原料中高含量钛、铁的快速连续测定

研究提出了一份试液中，用两种指示剂、一种标准溶液快速连续测定钛、铁的新方法。即在含有少量盐酸的硫、磷混酸介质中，用铝片将钛（Ⅳ）、铁（Ⅲ）分别还原成钛（Ⅲ）、铁（Ⅱ）；然后以中性红作示剂，在锰（Ⅱ）的催化下，用重铬酸钾标准溶液滴定铁（Ⅱ）。在陶瓷的料高含量钛、铁的分析中结果满意。     

The effect of partial substitution of Ti with Zr, Cr or V in the Mg35Ti10Ni55 electrode alloy on its electrochemical performance

In this paper, Zr, Cr and V were selected as the partial substitution elements for Ti to form Mg₃₅Ti₅M₅Ni₅₅ quaternary alloys prepared by means of mechanical alloying on the basis of the ternary Mg₃₅Ti₁₀Ni₅₅ electrode alloy previously studied by the authors. It is found that all the three quaternary alloys possess an amorphous main phase and exhibit improved cycling stability than the original ternary Mg₃₅Ti₁₀Ni₅₅. The Zr-substituted alloy has also a higher discharge capacity. X-ray photoelectron spectroscopy (XPS) surface analysis reveals that on the surface of each alloy a multi-component oxide composite film is formed, which is more compact and corrosion resistant than the Mg(OH)₂ film and the (TiO₂)_x(NiO)_y(Mg(OH)₂)_z composite films reported previously. Auger electron spectroscopy (AES) analysis shows that the substituting elements tend to reduce the thickness of the passivation films. The thickness of composite oxide film on the alloys is in the following order: Mg₃₅Ti₁₀Ni₅₅>Mg₃₅Ti₅V₅Ni₅₅>Mg₃₅Ti₅Zr₅Ni₅₅>Mg₃₅Ti₅Cr₅Ni₅₅. The result agrees well with that of the polarization resistances (R_P) values obtained from the electrochemical impedance spectroscopy (EIS) Nyquist diagrams. It demonstrates that the thicker the passivation film is, the higher the R_P is and the more difficultly the charge transfer reaction proceeds. Anodic polarization curves indicate that the addition of Cr and Zr decreases effectively the corrosion current. However, the corrosion of the electrode alloys in the electrolyte is still high and proceeds constantly as the corrosion current remains almost constant during further cycles.     

光纤光栅位移传感技术研究

介绍了一种光纤光栅传感器的在曲面空间位移测量方面的应用.随着外界应力的变化,光纤光栅的Bragg中心发射波长将发生相应的移动.利用此特性,提出并实现了一种精密的用光纤光栅作为敏感元件测量曲面空间间隙位移的方法,获得了光栅Bragg波长偏移量与曲面间隙位移量之间的曲线关系,其灵敏度可达3.5013 nm/mm,最后对实验结果进行了分析.     

三维电子海图自动建模技术研究

针对采用二维电子海图表示海洋自然地理环境在三维可视化方面的不足,介绍了从二维电子海图中提取海洋地理信息建立海洋地理信息数据库,而后利用三维建模软件和视景驱动软件实现三维电子海图的可视化和大地形的数据管理的方法和步骤,最后实现实体模型的动态装载.实验结果表明该方法可以有效地应用于海底及其他地貌物的生成和管理,并为最终建立大范围的虚拟战场海洋环境提供基础.     

基于信道辨识的自适应Turbo-OFDM系统性能研究

研究了信噪比对系统性能影响的规律,将信噪比分布分为高信噪比区、中信噪比区和低信噪比区3个区域。当部分平均信噪比分别取3个区域典型值时,引入迭代增益,判断典型信道状态对应的最佳迭代次数。将数据子信道对应的接收信噪比进行排序,计算部分平均信噪比,利用其进行聚类分析,对当前信道进行辨识,在不同的信道状态下,自适应选择迭代译码次数。仿真结果说明,在平坦慢衰落信道下,采用OFDM系统中基于信道辨识的自适应Turbo码译码算法,可以兼顾系统性能和译码速度,得到较低的平均误比特率和较高的平均译码速度。