压缩感知图像加权融合算法在热 故障监测中的应用

Aiming at tlie problems of large date in color image fusion of tlie thermal fault location of electrical equipment,researches and inductions were made for the color image fusion and compressed sensing theory,a kind of infrared and visible color image fusion algoritlim based on compressed sensing was proposed. Firstly,the infrared thermal image and visible color image date was decomposed into three channels of R,G,B,each channel of the date was represented by wavvlet-basis. Secondly,Gauss random matrix was used to sample the sparse data and get the measured value,the measurement value of the corresponding channel was fused by the weighting factors. Finally,the orthogonal matching pursuit reconstruction algorithm (OMP) was performed to reconstruct the fusion data of each channel,the reconstruction data was restored to the color fused image. The results indicate that the proposed algorithm can achieve fusion with less than 50% of the sample points. The value of AG,PSNR,SF,IE is close to the index of traditional data fusion,which maintaines the information of high temperature area and background area perfectly. [ABSTRACT FROM AUTHOR]     

Prediction of compressive strength and elastic modulus of carbonate rocks

Uniaxial Compressive Strength (UCS) and Modulus of elasticity (E) of carbonate rocks are very critical properties in petroleum, mining and civil industries. UCS is the measure of the strength of the rock and E depicts the stiffness, together they control the deformational behavior. But the heterogeneity introduced as a result of fractures, dissolution and dependency on pH and temperature makes them a difficult material to study. Complex diagenesis and resulting pore system makes the job even more daunting. So, an attempt is made to predict these properties using simple index parameters such as Porosity, Density, P-wave velocity, Poisson’s ratio and Point load index. Multiple Linear Regression Analysis (MVRA) and Artificial Neural Networking (ANN) have been used for predicting the two properties and the accuracy is tested by root mean square error. The results show that ANN has a better predictive efficiency than MVRA and they can be applied for predicting UCS and Young’s modulus of carbonate rocks with reasonable confidence.     

原子力显微镜测量双光子成型点的弹性模量

提出了一种飞秒激光双光子成型点弹性模量的测量及结果分析方法.借助于原子力显微镜,选用无针尖探针对成型点的力学性能进行了测试,建立了椭球-平面接触的弹性力学模型.考虑了成型点剩余部分形变对结果分析的影响,在标定微探针弹性系数和对粘附力进行分析的基础上,提取了力曲线中所包含的力学信息,推算出了成型点的弹性模量,得到了成型点的弹性模量低于宏观材料弹性模量的结论.     

Normal and lateral modulation with a scanning force microscope,an analysis: implication in quantitative elastic and friction imaging

Results and an analysis are presented on elastic and friction imaging by indirect force modulation with a scanning force microscope. Two techniques are compared, normal modulation (Z-modulation, perpendicular to the surface of the sample) and lateral modulation of the contact (X-modulation in the plane of the sample, perpendicular to the axis of the cantilever). Theoretical and experimental results show that lateral modulation offers great advantages compared to normal modulation: the images are free of artifacts and can be easily quantified. This revised version was published online in August 2006 with corrections to the Cover Date.     

弹性模量对弯曲成形法非球面研磨中磨具成形精度的影响

弯曲成形法非球面研磨中弹性模量误差是影响磨具成形精度的关键因素,通过力学和高等数学方法建立了磨具弯曲成形的数学模型,推导出误差公式,分析了弹性模量误差的影响,并给出了算例,表明在选择磨具材料的过程中．要根据工件的精度要求确定材料弹性模量的取值．保证其控制在一定范围内,从而保证磨具的成形精度,进一步提高研磨工件的面形精度。     

复合材料瓦面推力轴承弹性模量的研究

对复合材料瓦面推力轴承表面弹性层进行了不同温度下的整体加压和局部加压测试试验,在测得弹性层的压缩弹性模量的基础上,给出了理论弹性模量和计算弹性模量的定义,研究了载荷和温度对弹性模量的影响规律及弹性模量的取值范围,提出了以弹性层压缩弹性模量作为轴瓦整体压缩弹性模量的观点.所得结果可用于轴瓦结构设计、润滑参数计算及瓦面修形.     

数字弹性模量测定仪的设计与研究

介绍了一种应用激光技术、CCD摄像传感技术、液晶显示技术于一体的数字弹性模量测定仪,该仪器与弹性模量测定仪相比,具有操作简单,精度高,智能化水平高等优点,便于教学,可大大提高工作效率。     

Predicting modulus of rupture (MOR) and modulus of elasticity (MOE) of heat treated woods by artificial neural networks

In this study, MOR and MOE of the heat-treated wood were predicted by artificial neural networks (ANNs). For this purpose, samples were prepared from beech wood (Fagus orientalis Lipsky.) and spruce wood (Picea orientalis (L.) Link.). The samples were exposed to heat treatment at varying temperatures (125, 150, 175 and 200 °C) for varying durations (3, 5, 7 and 9 h). According to the results, the mean absolute percentage errors (MAPE) were determined as 0.74%, 1.01% and 1.04% in prediction of MOR values, and 1.14%, 2.21% and 2.13%, in prediction of MOE values for training, validation and testing data sets, respectively. In the prediction of MOR and MOE, values of R² were obtained greater than 0.99 for all data sets with the proposed ANN models. The results show that ANN can be used successfully for predicting MOR and MOE of heat-treated wood.     

根据不同模量弹性理论设计铸铁液压缸壁厚

根据不同模量弹性理论,推导出不同弹性模量材料圆筒承受均匀分布内压的应力解答,并应用莫尔强度理论对铸铁液压缸的壁厚进行了计算.     

Measurement and evaluation of the apparent modulus of elasticity of apple based on Hooke’s,Hertz’s and Boussinesq’s theories

Awareness on the mechanical properties of agricultural products is necessary in order to estimate and predict the deformation of viscoelastic materials under external loads for system design, transport, processing and packaging. The aim of this study was to evaluate three theories (i.e. Hooke, Hertz and Boussinesq) on the apparent modulus of elasticity of some apple varieties i.e. Golden Delicious, Red Delicious and Granny Smith. The theoretical results were analyzed in a factorial experiment with completely randomized design with 9 treatments and 15 replicates. The results showed the practical usability of Hertz’s theory with better prediction accuracy whilst the Boussinesq’s theory showed a significant difference of predicted modulus of elasticity compared to other theories and the values reported in some publications. Although, the Hook’s theory enables the identification of a bio-yield point on its force–deformation curve, but Hertz’s theory was recommended as the most appropriate method due to easiness of working on a cylindrical sample of apple and the closer agreement with reality. Based on the results of this study, Golden Delicious and Granny Smith varieties had the lowest and the highest modulus of elasticity as 2.211 MPa and 3.431 MPa, respectively. This difference shows the firmness of apple varieties and different tissue responses to external loads and forces accordingly.     

Excitation of the elastic half-space surface by normal rebounding impact of an indenter

A dynamic contact problem of the linear theory of elasticity regarding the response of the elastic half-space surface to the normal impact of an indenter is considered. If the indenter is spherical, the Hertzian theory serves to determine the impact parameters. The displacements of points on the surface remote from the contact spot are described by solving Lamb’s problem. In the case of impacts by a flexible plate indenter that transfers uniformly distributed load to the elastic half-space surface, a first order asymptotic model is applied, which takes into account the dissipative properties of the elastic base due to elastic energy transfer by waves to infinity. The main results of the work are obtained in closed form.