Defect imaging of composite plate is presented based on Reconstruction Algorithm for the Probabilistic Inspection of Damage（RAPID） and Omnidirectional Shear-horizontal wave Magnetostrictive Patch Transducer（OSH-MPT...
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Defect imaging of composite plate is presented based on Reconstruction Algorithm for the Probabilistic Inspection of Damage（RAPID） and Omnidirectional Shear-horizontal wave Magnetostrictive Patch Transducer（OSH-MPT） *** lowest shear-horizontal mode（SH0） can propagate in the composite plate through bonding *** can realize using the direct wave of SH0 mode to extract the damage *** is beneficial to detect composite plate in the case that the velocity of direct wave varies with the propagation direction.A small mass which is circular cylinder is bonded to simulate *** imaging results are achieved after eliminating the influence of the uneven probability distribution of *** OSH-MPT is a type of electromagnetic acoustic transducer（EMAT）.Due to the relatively low signal-to-noise characteristic of EMAT,the threshold is selected based on the Receiver Operating Characteristic（ROC） curve for improving RAPID-based imaging *** first OSH-MPT which mainly includes an annular magnetostrictive patch,a toroidal coil and a cylindrical permanent magnet was developed in recent years by Hong et al [1].Some parameters of OSH-MPT are modified to make it more suitable for the imaging in this *** RAPID with full summation method is defined as [2][3]P（x,y）=N∑n=1P_n（x,y）=N∑n=DI_nW_n[R_n（x,y）] The RAPID with full summation method is defined as P（x,y）=NΠn=1P_n（x,y）=NΠn={DI_nW_n[R_n（x,y）]+C} Two methods which are DI and DI are applied for calculatingn DI_*** DI is defined as DI（t）=(∫[V（t）-I（t）]dt/∫（t）dt) The DI is the signal difference coefficient（SDC） as SDC=1-C/σσ=t∑t=0[V（t）-μIt)-μ]/(t∑t=0[V（t）-μ_(V（t）]t∑t=0-μ])Eight OSH-MPT elements are bonded on the composite plate and the bonded mass simulates the discontinuity damage in 30 mm *** imaging area is set to 600 × 600 mm2 and the bottom left corner is the original point of *** mass is located at（339,315）.The problem of the uneven probability distribution exists i
The Time-of-Flight(TOF) camera is a new elegant choice for 3D measurement and modelling in many different ***,due to the different method of these new devices of the technology on the market,the knowledge of its perfo...
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The Time-of-Flight(TOF) camera is a new elegant choice for 3D measurement and modelling in many different ***,due to the different method of these new devices of the technology on the market,the knowledge of its performance is far away from *** particular,the distance measurements of these devices are often influenced by some systematic errors,which decrease the quality of the data a *** evaluate these errors,some experiments have been done on pulsed TOF cameras developed by our *** this paper,we proposed a novel calibration procedure for pulsed TOF cameras,which deal with the evaluation of the camera heating period,capture the intrinsic matrix of the camera,the measurement error of different distances and colors,and a quick transformation for coordinate.
A novel microstrip antenna with the frequency reconfiguration characteristic is proposed in this article. A U-slot has been introduced in the square patch. The slot is switched on and off by using three PIN diodes, wh...
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The multicomponent reactions of o-, m, or p-iodophenols, arylboronic acids, and dichloromethane (DCM) have been designed for the synthesis of various bisaryloxy methanes via one-pot procedure consists of Williamson et...
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The multicomponent reactions of o-, m, or p-iodophenols, arylboronic acids, and dichloromethane (DCM) have been designed for the synthesis of various bisaryloxy methanes via one-pot procedure consists of Williamson etherification and Suzuki coupling. (C) 2016 Elsevier Ltd. All rights reserved.
Background: Rare ginsenosides in Panax quinquefolius L. have strong bioactivities. The fact that it is hard to obtain large amounts of rare ginsenosides seriously restricts further research on these compounds. An easy...
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Background: Rare ginsenosides in Panax quinquefolius L. have strong bioactivities. The fact that it is hard to obtain large amounts of rare ginsenosides seriously restricts further research on these compounds. An easy, fast, and efficient method to obtain different kinds of rare ginsenosides simultaneously and to quantify each one precisely is urgently needed. Methods: Microwave-assisted extraction (MAE) was used to extract nine kinds of rare ginsenosides from P. quinquefolius L. In this article, rare ginsenosides [20(S)-Rhl, 20(R)-Rhl, Rg6, F4, Rk3, 20(S)-Rg3, 20(R)-Rg3, Rk1, and Rg5] were identified by high performance liquid chromatography (HPLC)-electrospray ionization-mass spectrometry. The quantity information of rare ginsenosides was analyzed by HPLC-UV at 203 nm. Results: The optimal conditions for MAE were using water as solvent with the material ratio of 1:40 (w/v) at a temperature of 145 degrees C, and extracting for 15 min under microwave power of 1,600 W. Seven kinds of rare ginsenosides 120(S)-Rh1, 20(R)-Rh1, Rg6, F4, Rk3, Rk1, and Rg5] had high extraction yields, but those of 20(S)-Rg3 and 20(R)-Rg3 were lower. Compared with the conventional method, the extraction yields of the nine rare ginsenosides were significantly increased. Conclusion: The results indicate that rare ginsenosides can be extracted effectively by MAE from P. quinquefolius L in a short time. Microwave radiation plays an important role in MAE. The probable generation process of rare ginsenosides is also discussed in the article. It will be meaningful for further investigation or application of rare ginsenosides. Copyright (C) 2016, The Korean Society of Ginseng, Published by Elsevier.
Imaging detection of composite plates is presented based on reconstruction algorithm for the probabilistic inspection of damage(RAPID) and double-turn coil omnidirectional shear-horizontal wave magnetostrictive patch ...
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Imaging detection of composite plates is presented based on reconstruction algorithm for the probabilistic inspection of damage(RAPID) and double-turn coil omnidirectional shear-horizontal wave magnetostrictive patch transducer(OSH-MPT) array. The lowest shear-horizontal mode(SH) can propagate in the composite plate through bonding double-turn coil OSH-MPT. RAPID can realize using the direct wave of SH mode to extract the damage information. It is beneficial to detect composite plate in the case that the velocity of direct waves varies with the propagation direction. A small mass which is circular cylinder is bonded to simulate damage. Imaging results are achieved after using modified methods for eliminating the influence of the uneven probability distribution of the array(UPDA) in RAPID. Threshold is selected based on the receiver operating characteristic(ROC) curve for improving RAPID-based imaging accuracy.
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