动态测量数据的合理性检验方法研究

采样数据合理性检验,是数据处理中重要的一环,它的主要功能是鉴别采样数据中可能含有的异常值,并进行相应的机理分析与修复工作.本文从飞行器外测系统工程应用的角度出发,给出了两种简单易行的判断方法.     

基于数据三分法的DEA模型

传统DEA模型在数据两分(偏好与规避)的基础上考察决策单元的有效性,在某些场合不再适用,文章根据决策者的偏好将数据分为三类:规避、偏好、中性类,在此基础上构造评价相对有效性的DEA模型.相较而言,基于数据三分法的DEA模型更具一般性,利用该模型,文章考察了中国近年投入产出绩效问题.     

A method to quantitatively estimate rainfall rate above water surface based on different spectra shapes generated by rainfall

A method combined with the nonlinear least-square regression to quantitatively estimate rainfall rate over water surface from the different spectrum shapes generated by rainfall in some frequency bands was presented.About 2000 min spectrum data generated by rainfall have been collected in an open-lake in Xiamen city.As a result,the spectrum shape in 15-30 kHz is fitted to log-linear law which allows classification of rain into three categories from the spectrum slope:no rain,drizzle(rainfall rate>10 mm/h)and heavy rain(rainfall rate>10 mm/h).Then,rainfall detection is made and rainfall rate is quantified in drizzle time with Logistic model in the frequency bands of 2-15 kHz,and the rainfall rate in heavy rainfall also quantified with log-linear regression.Finally,all measured spectrum data are used to calculate rainfall rate with the algorithm.The results show that the estimated rainfall rates are comparably coincident with the synchronously measured ones.The average error of accumulative rainfall per min is only l%-4%.     

单目摄像机-激光测距传感器位姿测量系统

在单目视觉测量中,由于模型自身的限制,沿摄像机光轴方向上的位移测量精度一般远低于垂直光轴方向上的位移测量精度.首先,从数学模型上分析了单目视觉位姿测量在沿光轴方向上位移测量精度低的原因;然后,为了提高沿摄像机光轴方向上的位移测量精度,通过在沿摄像机光轴方向上加装一个高精度的激光测距传感器,设计了一种单目摄像机-激光测距...     

对2011年两道高考物理实验题形成过程的质疑

在2011年的高考物理实验题中有两道的实验数据和结果与实事不符,题的形成没有以实验事实为依据,有杜撰嫌疑.下面就此二题进行说明.【例1】[2011年高考广东卷理综第34题第(2)小题]在"描绘小电珠的伏安特性曲线"实验中,所     

用于新一代高密度可录光盘的有机材料研究进展

本文在总结近几年来国内外文献和专利报道的最新研究成果基础上,简要阐述了新一代高密度可录光盘的数据存储机理以及激光器工作波长与有机材料薄膜最大吸收波长相匹配的要求,介绍了在蓝(紫)光波段内(350～400nm)具有显著吸收的有机材料研究概况,并讨论了这些有机材料作为新一代高密度可录光盘数据存储介质的可能性。最后,对有机材料用于新一代高密度可录光盘数据存储介质的研究重点以及今后的发展前景进行简要讨论和展望。     

Multi-modal calculations of prompt fission neutrons from 238U（n,f） at low induced energy

Properties of prompt fission neutrons from ²³⁸U(n, f) are calculated for incident neutron energies below 6 MeV using the multi-modal model, including the prompt fission neutron spectrum, the average prompt fission neutron multiplicity, and the prompt fission neutron multiplicity as a function of the fission fragment mass υ(A) (usually named “sawtooth” data) The three most dominant fission modes are taken into account. The model parameters are determined on the basis of experimental fission fragment data. The predicted results are in good agreement with the experimental data.     

Structure of ^6He in the frame of a cluster model

A microscopic cluster model with a fully correlated Gaussian basis is developed. In the model, the stochastic variational method is used in order to calculate the ground-energy and the mean-square radius conveniently. Based on this model, the ground-energy level and radius of the neutron halo nucleus, ⁶He, are calculated as a α+n+n three-cluster model. The results are in good agreement with the experimental data.