基于KL散度的岩土参数可信度贝叶斯估计

鉴于先验信息与样本信息的不匹配, 会导致岩土参数的贝叶斯估计结果与实际产生偏差. 为解决该问题, 本文引入可信度贝叶斯估计的概念, 并结合相容性检验, 改进了基于KL散度的经典可信度计算公式. 最后, 以宁波地区典型土层的地基承载力为例, 对比改进可信度贝叶斯、经典可信度贝叶斯和经典贝叶斯的估计结果. 结果表明: 改进可信度贝叶斯方法能在充分利用先验信息的前提下, 提高样本信息在参数估计中的计算权重, 同时也避免了不匹配问题所导致的贝叶斯计算误差.     

一种新型的振荡场光化学传感器

利用法布里珀罗振荡模构造了一种新型的光化学传感器。与传统的以表面等离子模和光导模为探针的迅衰场传感器不同 ,这种新型结构中被传感介质处于法布里珀罗腔的振荡场中 ,其能量在全部入射光能中的比重占得很大 ,使得这种传感器具有很高的灵敏度。实验证实这类传感器对葡萄糖溶液浓度和折射率的测量精度皆可达 10 - 5数量级以上     

Time Series Prediction Based on Chaotic Attractor

A new prediction technique is proposed for chaotic time series. The usefulness of the technique is that it can kick off some false neighbor points which are not suitable for the local estimation of the dynamics systems. A time-delayed embedding is used to reconstruct the underlying attractor, and the prediction model is based on the time evolution of the topological neighboring in the phase space. We use a feedforward neural network to approximate the local dominant Lyapunov exponent, and choose the spatial neighbors by the Lyapunov exponent. The model is tested for the Mackey-Glass equation and the convection amplitude of lorenz systems. The results indicate that this prediction technique can improve the prediction of chaotic time series.     

940 nm low beam divergence tapered window laser arrays

The structures of 940 nm low vertical beam divergence semiconductor lasers grown by molecular beam epitaxy are presented. The high power laser consists of an array of closely spaced tapered waveguides giving lower parallel beam divergence and window structure. The emission wavelength is 939 nm. The FWHM of the far field pattern is 8×30°. The maximum continuous wave (CW) output power of 30 W has been achieved. In the aging tests, the laser arrays have been operating for over 3000 h under the CW condition of 25 W.     

用激光单缝衍射实验仪做扩展实验

在大学物理实验中,单缝衍射实验仪一般用来测量衍射光强分布和缝宽,本文对实验内容进行了扩展,增加了测量细丝直径、He-Ne激光束的光强分布、激光束光斑尺寸及发散角等内容.     

一种全方位激光束检测仪

基于单平板的两种旋转特性（绕表面中心法及绕入射光束光轴旋转）作者提出了一种任意剪切方向的全方位剪切干涉仪，这不仅对于旋转对称发光，尤其对于非旋转对称激光束的定量检测具有十分重要的应用价值，文中描述了该仪器原理，参数及应用实例。     

ASSESSING LOCAL PRIOR INFLUENCE IN BAYESIAN ANALYSIS

ＡＳＳＥＳＳＩＮＧＬＯＣＡＬＰＲＩＯＲＩＮＦＬＵＥＮＣＥＩＮＢＡＹＥＳＩＡＮＡＮＡＬＹＳＩＳ￥ＳＨＩＨＪＩＡＮＱＩＮＧＡｂｓｔｒａｃｔ：Ａｇｅｎｅｒａｌｍｅｔｈｏｄｆｏｒａｓｓｅｓｓｉｎｇｌｏｃａｌｉｎｆｌｕｅｎｃｅｏｆｍｉｎｏｒｐｅｒｔｕｒｂａｔｉ...     

在无界区域上拟线性散度型椭圆型方程的Dirichlet问题

研究在无界区域上的二阶拟线性散度型椭圆型方程Dirichlet问题在无穷远处径向收敛的古典解存在性和唯一性。     

19世纪上半叶的无穷级数敛散性判别法

对19世纪上半叶欧洲数学家在正项级数敛散性判别方面的工作作了考察和分析.