Symmetric low-frequency feature-guided ultrasonic waves in thin plates with transverse bends

Ultrasonics ◽  
2015 ◽  
Vol 56 ◽  
pp. 232-242 ◽  
Author(s):  
Abilasha Ramdhas ◽  
Roson Kumar Pattanayak ◽  
Krishnan Balasubramaniam ◽  
Prabhu Rajagopal
Ultrasonics ◽  
2018 ◽  
Vol 90 ◽  
pp. 120-124 ◽  
Author(s):  
Pabitro Ray ◽  
Balaji Srinivasan ◽  
Krishnan Balasubramaniam ◽  
Prabhu Rajagopal

Author(s):  
Liudas Mažeika ◽  
Rymantas Kažys ◽  
Renaldas Raišutis ◽  
Andriejus Demčenko ◽  
Reimondas Sliteris

2021 ◽  
Vol 177 ◽  
pp. 106475
Author(s):  
Peter Y. Wang ◽  
Maria E.M. Garlock ◽  
Ted P. Zoli ◽  
Spencer E. Quiel

2018 ◽  
Vol 2 (3) ◽  
pp. 247-258
Author(s):  
Zhishuo Liu ◽  
Qianhui Shen ◽  
Jingmiao Ma ◽  
Ziqi Dong

Purpose This paper aims to extract the comment targets in Chinese online shopping platform. Design/methodology/approach The authors first collect the comment texts, word segmentation, part-of-speech (POS) tagging and extracted feature words twice. Then they cluster the evaluation sentence and find the association rules between the evaluation words and the evaluation object. At the same time, they establish the association rule table. Finally, the authors can mine the evaluation object of comment sentence according to the evaluation word and the association rule table. At last, they obtain comment data from Taobao and demonstrate that the method proposed in this paper is effective by experiment. Findings The extracting comment target method the authors proposed in this paper is effective. Research limitations/implications First, the study object of extracting implicit features is review clauses, and not considering the context information, which may affect the accuracy of the feature excavation to a certain degree. Second, when extracting feature words, the low-frequency feature words are not considered, but some low-frequency feature words also contain effective information. Practical implications Because of the mass online reviews data, reading every comment one by one is impossible. Therefore, it is important that research on handling product comments and present useful or interest comments for clients. Originality/value The extracting comment target method the authors proposed in this paper is effective.


1982 ◽  
Vol 60 (9) ◽  
pp. 1358-1364 ◽  
Author(s):  
N. H. Rich ◽  
M. J. Clouter ◽  
H. Kiefte ◽  
S. F. Ahmad

Low frequency Raman spectra of single crystals of orientationally disordered phases of oxygen, nitrogen, and carbon monoxide, and spectra of those substances as liquids show two linear segments in semi-log plots. Slopes of the higher frequency segments are nearly equal for all cases; slopes of the lower frequency segments are particular to the substance and are nearly the same in both liquid and crystal for O2 and CO. Spectra of single crystals of argon doped with O2, N2, or CO show two distinct features superimposed on a sloping background. Impurity molecule reorientation apparently accounts satisfactorily for all spectral features, but translation–rotation coupling may allow a contribution to the higher frequency feature arising from a local phonon mode in argon.


1994 ◽  
Vol 48 (6) ◽  
pp. 733-736 ◽  
Author(s):  
N. T. McDevitt ◽  
J. S. Zabinski ◽  
M. S. Donley ◽  
J. E. Bultman

Crystalline disorder in thin films plays an important role in determining their properties. Disorder in the crystal structure of MoS2 films prepared by magnetron sputtering and pulsed laser deposition was evaluated with the use of Raman spectroscopy. The peak positions and bandwidths of the first-order Raman bands, in the region 100 to 500 cm−1, were used as a measure of crystalline order. In addition, a low-frequency feature was observed at 223 cm−1 that is not part of the normal first-order spectrum of a fully crystalline specimen. Data presented here demonstrate that this band is characteristic of crystalline disorder, and its intensity depends on the annealing history of the film. This behavior seems to be analogous to the disorder found in graphite thin films.


2015 ◽  
Author(s):  
JABID MENDEZ ◽  
RODOLFO MEJIA ◽  
JOHN PINEDA ◽  
LUIS MUJICA ◽  
MAGDA RUIZ

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