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Spectral Analysis of the Moving System with Multi-object Based on V-system
Ruixia Song,Chenghua Li,Xiaochun Wang,Yena Wang,Yanqing Xu,Dongxu Qi (사)한국CDE학회 2013 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
Based on an orthogonal function system over triangular domain, V-system, decomposing orthogonally a moving system with multiple moving objects into V-series, motion state of this moving system at different moment can be expressed in the frequency domain. To make full use of the advantage of the V-system, the capability to precisely express a 3D object group, each moving object is represented by a triangular mesh model, and then the energy curve data for the moving system is calculated by determining the coefficients of the V-series. The energy curve can be applied to the state analysis of the moving system. The relationship of energy curves of a moving system with different triangular mesh resolutions is analyzed. The experiment results show that there exist no strong dependence between energy curve and the resolution of 3D model, so when performing spectral analysis for a moving system, we can choose the model with low resolution, so that the computation can be reduced and the analysis efficiency can be improved. Finally, the mathematic relationship between energy of a moving system and some related variables is obtained by processing a large number of experimental data using the linear regression method. The characteristic of this study is reflected in the whole expression of a 3D model group, and the objects in the group are in motion.
Multiwavelets over a Triangular Domain
Jian Li,Ruixia Song,Xiaochun Wang,Dongxu Qi (사)한국CDE학회 2010 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
Employing barycentric coordinates, this paper propose a kind of orthogonal muliwavelet over a triangular domain, called V-system. The V-system consists of not only smooth functions but also functions with discontinuities. Finitely terms of the V-system can exactly represent the geometric objects which can be expressed by a piecewise polynomials. Since barycentric coordinates are a fundamental tool for dealing with the case of triangles, and the expressions of the basic functions of the V-system in baycentric coordinates have short support, orthogonality, symmetry and vanishing moments, so the system is more concise and convenient to be used to realize orthogonal decomposition for the complex geometry models in CAGD. Especially, the geometry model composed of several separate parts can be exactly reconstructed, which can’t be realized by other continuous wavelets. The orthogonal decomposition provides theoretic fundament for feature extraction and further classification and shape retrieval. Experiment results show that this method is feasible and easy to use, and it worth being extended.
Measurement of elasticity of normal placenta using the Virtual Touch quantification technique
Size Wu,Ruixia Nan,Yueping Li,Xiaojing Cui,Xian Liang,Yanan Zhao 대한초음파의학회 2016 ULTRASONOGRAPHY Vol.35 No.3
Purpose: The aim of this study was to measure the elasticity of normal placentas using the VirtualTouch quantification (VTQ) technique. Methods: This study was approved by the Institutional Ethics Committee. Fifty randomly selected,healthy pregnant women in their second trimester and 50 randomly selected, healthy pregnantwomen in their third trimester with a single fetus were included, and their placentas underwentVTQ through shear wave velocity (SWV) measurements. The measurements were performed atdifferent locations to sample different areas of the placenta. Measurements were performed 3-4times in each location, the mean shear wave velocities were calculated without the highest andlowest values of measurements in each region, and the results were compared. Results: The SWV of the placenta was 0.983±0.260 m/sec, and the minimal and maximal speedwas 0.63 m/sec and 1.84 m/sec, respectively. There was no significant difference between thesecond and third trimester of VTQ of the placenta in terms of SWV (0.978±0.255 m/sec vs. 0.987±0.266 m/sec, P=0.711). The maternal age between second and third trimester was27.9±4.3 years and 29.2±4.4 years, respectively; there was no significant difference betweenthem (P=0.159). Conclusion: The results of this study show that the SWV of normal placenta tissue is 0.983±0.260m/sec, it has little variation between the second and third trimesters, and the VTQ technique maypotentially play an additional role in placenta evaluation.
Muhammad Faizan,Hao Li,Yumei Liu,Kexin Li,Shuang Wei,Ruirui Zhang,Ruixia Liu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-
Currently, deep eutectic solvents (DESs), as an exclusive class of ionic liquid analogs, are extensivelyemployed in various fields. Herein, vanadium phosphorus oxide (VPO) catalysts assisted by copperbaseddeep eutectic solvent (Cu-DES) as an electronic promoter and structure directing agent were ingeniouslysynthesized and exploited in the selective oxidation of n-butane to maleic anhydride (MA). TheDES is efficient, cost effective and highly green compared to conventionally use metal inorganic modifiers. Cu-DES was prepared from a eutectic mixture of an organic salt (ChCl) and a metal salt hydrate/metal salt of cupric (Cu(NO3)2.3H2O, CuCl2) and cuprous (CuCl) salt with a molar ratio of 1:1–1:3, whichnotably improved the catalytic performance compared to that of an unpromoted VPO catalyst. The MAselectivity and n-butane conversion of Cu–DES–VPO increased significantly, while the COx (CO andCO2) selectivity decreased. FTIR, DSC, XRD, SEM, EDS, TEM, Raman, TGA, XPS, and NH3-TPD characterizationtechniques were utilized to fully analyze the DES, precursor and catalyst to explore MA selectivity. This work shifts the significant increase of 13% n-butane conversion, 11% MA selectivity and 16% MAmass yield, which greatly influences low carbon alkane utilization. Importantly, the CO: CO2 ratio isreduced from 2.02 to 1.62, which is more beneficial for chemical plants as well as green environments.