光纤Bragg光栅横向负载敏感特性的实验研究

对光纤Bragg光栅的横向负载敏感特性进行了实验研究 .利用光纤中的应力双折射效应 ,使光纤光栅横向受压 ,产生谐振波长分裂 .通过实验研究得到了良好的谐振波长分裂与横向负载的关系曲线 ;在此基础上 ,进行了波长寻址的多点横向负载分布测量的初步探索 ,完成了两光栅同时传感的实验研究 .     

An extended Lagrangian support vector machine for classifications

Lagrangian support vector machine (LSVM) cannot solve large problems for nonlinear kernel classifiers. In order to extend the LSVM to solve very large problems, an extended Lagrangian support vector machine (ELSVM) for classifications based on LSVM and SVMlight is presented in this paper. Our idea for the ELSVM is to divide a large quadratic programming problem into a series of subproblems with small size and to solve them via LSVM. Since the LSVM can solve small and medium problems for nonlinear kernel classifiers, the proposed ELSVM can be used to handle large problems very efficiently. Numerical experiments on different types of problems are performed to demonstrate the high efficiency of the ELSVM.     

Function analysis of a semi-dwarf sdg in rice with near isogenic lines

The physiological phenotype of the rice semi-dwarf mutant,sdg,was characterized in details using a pair of near isogenic .Neither gibberellin*deficient nor gibberellin-insensitive is characteristic of the sdgphenotype.Byanalyzing the secretion of aamylas and the promotion of stem growth caused by eogenous gibberellin(GA),the sdg plant was found to have decreased sensitivity to the GA at the seedling stage. The dwarfism stature of the sdg mutant can be attributed to the shortened internodes. Increase of the cell sults indicate the protein encded by the wild type gene of sdg may be a regulator for cell elogation.     

Solving constrained traveling salesman problems by genetic algorithms

Three kinds of constrained traveling salesman problems (TSP) arising from application problems, namely the open route TSP, the end-fixed TSP, and the path-constrained TSP, are proposed. The corresponding approaches based on modified genetic algorithms (GA) for solving these constrained TSPs are presented. Numerical experiments demonstrate that the algorithm for the open route TSP shows its advantages when the open route is required, the algorithm for the end-fixed TSP can deal with route optimization with constraint of fixed ends effectively, and the algorithm for the path-constraint could benefit the traffic problems where some cities cannot be visited from each other.     

Topcon-711全站仪放线测量程序使用

介绍了应用Topcon-711全站仪对输入点坐标放样、输入平面线性元素放中线,及根据坡度进行边桩放样的使用方法,并用图示做了详细说明,在公路测量中非常有实用意义。     

撞击流浓缩器浓缩溶液的数学模型

在理论分析的基础上导出了撞击流浓缩器浓缩溶液的数学模型,并通过实验结果验证了模型的正确性;计算结果得到了浓缩器内气、液温度和速度及液滴浓度和累积蒸发量沿轴向位移的变化。     

多回合组合双向拍卖交易机制研究

以组合双向拍卖分析为基础,建立了相关的数学模型,分别对单一回合和多个回合的组合双向拍卖交易机制进行了研究,证明多回合组合双向拍卖能更大地提高社会福利,也为进一步研究组合双向拍卖的市场效率、竞争均衡、竞标策略和计算机的模拟实验等问题提供了基础.     

共振解调和小波分析在机械故障诊断中的应用

提出共振解调技术的数学模型,求解数学模型的脉冲响应,为该技术在正常低频振动中提取所夹带的微小冲击的应用提供了理论依据。介绍小波分析提取微小冲击信息在诊断轴承初始故障中的应用,通过MATLAB数字仿真和现场应用实例,取得与共振解调技术相同的应用效果,说明小波分析和共振解调技术在提取齿轮、轴承机械故障的微小冲击的应用上是非常有效的。     

超宽带合成孔径雷达树干杂波的统计特性分析

针对超宽带合成孔径雷达在树林区域探测隐蔽目标的应用场合,研究了树干杂波的统计特性。运用实验数据从幅度直方图拟合、高阶统计量和杂波统计模型识别几方面分析了VHF/UHF波段超宽带合成孔径雷达树干杂波的统计特性,得出了以K-分布为杂波模型的目标检测算法才能获得较佳的检测结果的新结论。     

调频线性度对线性调频信号性能影响分析

针对去调频和脉冲压缩两种不同的处理方式,深入研究了线性调频信号调频线性度对信号性能的影响,得到LFM信号带宽越大,误差频率越低,对线性度要求越高的结论,且在相同边带抑制的条件下,去调频处理比脉冲压缩处理对LFM信号线性度的要求大约提高了一倍。仿真结果验证了理论分析的正确性。