基于BP神经网络的交流输电线路可听噪声预测模型

可听噪声属于输电线路电磁环境的影响因子之一,其常规预测模型均存在使用条件受约束或预测误差偏大的问题.根据间接预测法的思想,以可听噪声通用表达式中的4个因素为输入变量,可听噪声值为输出变量,建立了三层结构的BP神经网络交流输电线路可听噪声预测模型.以国外多条输电线路可听噪声数据为样本,通过BP神经网络对样本进行训练,运用得到的模型对预测集线路的可听噪声值进行了预测.结果表明,与常规GE公式相比,采用BP神经网络预测模型的预测平均绝对误差要小1.641 4 d B(A).     

非线性反应扩散对流方程在多项式子空间的分类

利用不变子空间方法研究非线性反应扩散对流方程,得到了非线性反应扩散对流方程在它所容许的多项式不变子空间中的分类,从而求出相应方程的精确解.     

用动力学法研究苯乙烯─丙烯酸共聚物的序列分布

用不同的方法合成了苯乙烯（st）─丙烯酸（AA）共聚物P(St－Co－AA)．用Fineman－Ross法求出了苯乙烯和丙烯酸单体的竞聚率．按Markov一级动力学模型，求出了共聚物的序列公布．     

Active regions’ setting of the extracellular ligandbinding domain of human interleukin-6 receptor

The reliable three dimensional (3-D) structure of the extracellular ligand-binding domain (V106-P322) of human interleukin-6 receptor (hIL-6R) has been constructed by means of computer-guided homology modeling techniques using the crystal structure of the extracellular ligand-binding region (K52–L251) of human growth hormone receptor (hGHR) as templet. The space location of some key residues which influence the combination ability between the receptor and the ligand has been observed and the effects of point mutagenesis of the four conservative cysteine residues on the space conformation are analyzed. The results show that the space conformation of the side-chain carboxyl of E305 plays a key role in the ligand-binding ability. Furthermore, the space conformation of the side-chain carboxyl of E305 is very important for the electrostatic potential complementarity between hIL-6R and hIL-6 according to the docking method.     

宁夏南部黄土高原地区土地适宜性评价研究

根据联合国粮农组织（ＦＡＯ）土地评价纲要的分类体系，采用定性与定量相结合的方法，对宁夏南部黄土高原地区的土地进行了适宜性评价，并给出了该地区的土地适宜性能、质量等级、数量分布及亚级的数量和分布特征．     

Novel passive localization algorithm based on weighted restricted total least square

A novel multi-observer passive localization algorithm based on the weighted restricted total least square (WRTLS) is proposed to solve the bearings-only localization problem in the presence of observer position errors. Firstly, the unknown matrix perturbation information is utilized to form the WRTLS problem. Then, the corresponding constrained optimization problem is transformed into an unconstrained one, which is a generalized Rayleigh quotient minimization problem. Thus, the solution can be got through the generalized eigenvalue decomposition and requires no initial state guess process. Simulation results indicate that the proposed algorithm can approach the Cramer-Rao lower bound (CRLB), and the localization solution is asymptotically unbiased.     

高炉探尺全数字直流调速系统

介绍了全数字直流调速装置SIMOREGK6RA24在高炉探尺系统中的运用，该系统具有控制精度高，组态方便，调试简单，故障率低等优点。     

弱分形渗流及其临界概率

在对任意的 ｍ ， Ａ０ 为 ｍ － ｇｏｏｄ 的意义下建立了一个弱分形渗流模型，且由弱分形渗流模型产生过程的自相似性， 给出了其对应的临界概率的值     

一种基于黑板模型的猜测推理方法

针对黑板结构中的猜测现象提出了一种基于数据依赖图的猜测推理方法，并给出了这种方法的模型及实例