Dynamic Detection Method of Medium-Low Speed Maglev F-Track seams Based on Machine Vision

This paper presents a dynamic detection method of medium and low speed maglev F-track seam based on machine vision detection technology. A Kalman filter light bar center extraction algorithm based on ridge line prediction is proposed for the bar image of F-track seam detection. And a threshold segmentation feature point extraction method is proposed for the center of the light bar. The static and dynamic precision of detection system are verified by the stability test, static and dynamic precision test. The static detection accuracy of end of F-track seam is less than 0.5mm and dynamic detection accuracy is less than 0.8mm. Then the static precision is less than 0.2mm the dynamic accuracy is less than 0.5mm about the horizontal F-track seam. And the static precision is less than 0.2mm, and the dynamic accuracy is less than 0.5mm about the vertical F-track seam. The detection accuracy of the system meets the requirements of F-track seam precision.

Experimental investigation of the uncertainty principle for radial degrees of freedom

While the uncertainty principle for linear position and linear momentum,and more recently for angular position and angular momentum,is well established,its radial equivalent has so far eluded researchers.Here we exploit the logarithmic radial position,ln r,and hyperbolic momentum,PH,to formulate a rigorous uncertainty principle for the radial degree of freedom of transverse light modes.We show that the product of their uncertainties is bounded by Planck’s constant,Δln r·ΔPH≥h∕2,and identify a set of radial intelligent states that satisfy the equality.We illustrate the radial uncertainty principle for a variety of intelligent states,by preparing transverse light modes with suitable radial profiles.We use eigenmode projection to measure the corresponding hyperbolic momenta,confirming the minimum uncertainty bound.Optical systems are most naturally described in terms of cylindrical coordinates,and our radial uncertainty relation provides the missing piece in characterizing optical quantum measurements,providing a new platform for the fundamental tests and applications of quantum optics.

Design, Synthesis, and Insecticidal Activities of Novel Pyranoside Derivatives Targeting at Potential Second Calcium Channel IP3 Receptor

In order to search for potent and environmental friendly insecticides with new modes of action, a series of pyranoside derivatives mimicking D-myo-inositol 1,4,5-trisphosphate （IP3） were designed and synthesized according to the bioisosterie approach. The biological assay indicated that most of the new compounds showed moderate to good insecticidal activities against oriental armyworm （Mythimna separata） and diamondback moth （PluteIla xylostella）. Especially, compound 5g displayed 80% larvicidal activity against oriental armyworm at 50 mg/L. Meanwhile, 5a showed 100% and 70% larvicidal activities against diamondback moth at 50 and 25 nag/L, respectively. To further explore the mode of action, calcium imaging technique was applied to study the effects of 5a, 5g, and 5i on the intracellular calcium ion concentration （[Ca^2＋]i） in central neurons isolated from Spodoptera exigua. The results indicated that the tested compounds released stored calcium ions from endoplasmic reticulum.