用离散小波变换建立的Fisher判别法对海上溢油的鉴别

采用恒波长同步荧光光谱法检测分析8种燃料油、7种中东原油、14种非中东原油的荧光特征,结合离散小波变换以及Fisher判别法建立海上溢油油种鉴别的模型。29种油样风化前后均在波长(280±2),(302±2),(332±2)和(380±2) nm处有典型的荧光峰,但在(380±2) nm处风化油样的荧光强度的离散度过大,该波长不适于油种鉴别。在db7小波基函数下对29种原始油样荧光谱图进行6层分解,提取d3细节系数特征,确定波长(255±2),(280±2),(302±2),(332±2)和(354±2) nm处的小波系数并用于Fisher判别模型建立。29种油样在(280±2) nm处均有极值点,燃料油小波系数位于44.06±5.62之间,原油位于22.47±5.12之间,此波长处的小波系数可区分燃料油与原油。建立的Fisher判别模型不仅能区分燃料油和原油还能进一步区分中东原油,Wilks’s lambda分布所对应的P值分别为0和0.02,表明模型是可行的。模型验证结果显示,对风化后的建模油样的鉴别正确率达到96.6%,对非建模23种油样鉴别正确率达到95.7%。由于建模油样风化前后的修正余弦相似度为0.91~0.98,因而以未风化油样建立的油种鉴别模型同样适用于风化后油样的辨别。     

一种基于融合反馈的改进粒子滤波行人跟踪算法

针对一般粒子滤波算法容易受到相似背景干扰和遮挡影响的问题,提出一种新的融合反馈的改进粒子滤波跟踪算法。该算法将最近的观测信息融入建议分布函数,便于粒子搜索目标最可能的位置,根据相对位移的变化自适应调整跟踪窗口尺度的变化,降低了计算的复杂度,一定程度上保持了粒子的多样性。实验结果表明:该算法有效地解决了遮挡、相似背景混乱以及目标尺寸变化问题,整体跟踪性能优于粒子滤波算法。     

考虑地基相互作用时筒仓模型的静力实验研究及有限元分析

设计制作了有机玻璃筒仓模型,在空仓及装填了散料（大米）的满仓两种情况下,将筒仓分别置于生地基和用海绵橡胶垫模拟的弹性地基上,实测料仓仓壁及支承筒的静力应变值,并与有限元计算结果进行了比较,两者能够较好地吻合,证明实验是可靠的,所用的力学计算模式及模型分析的简化是正确的。     

THE EXACT SOLUTION FOR THE GENERAL BENDING PROBLEMS OF CONICAL SHELLS ON THE ELASTIC FOUNDATION

The general bending problem of conical shells on the elastic foundation (Winkler Medium) is not solved. In this paper, the displacement solution method for this problem is presented. From the governing differential equations in displacement form of conical shell and by introducing a displacement function U(s,θ), the differential equations are changed into an eight-order soluble partial differential equation about the displacement function U(s,θ) in which the coefficients are variable. At the same time, the expressions of the displacement and internal force components of the shell are also given by the displacement function U(s θ). As special cases of this paper, the displacement function introduced by V.S. Vlasov in circular cylindrical shell, the basic equation of the cylindrical shell on the elastic foundation and that of the circular plates on the elastic foundation are directly derived. Under the arbitrary load, and boundary conditions, the general bending problem of the conical shell on the elas