A Nonconformal FEM-DDM With Tree–Cotree Splitting and Improved Transmission Condition for Modeling Subsurface Detection Problems

2014 ◽  
Vol 52 (1) ◽  
pp. 355-364 ◽  
Author(s):  
Jin Ma ◽  
Jian-Ming Jin ◽  
Zaiping Nie
Keyword(s):  
Transmission Condition ◽  
Subsurface Detection

scholarly journals Investigation of dominant traveling 10-day wave components using long-term MERRA-2 database

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Chunming Huang ◽  
Wei Li ◽  
Shaodong Zhang ◽  
Gang Chen ◽  
Kaiming Huang ◽  
...  
Keyword(s):  
Flow Instability ◽  
Transmission Condition ◽  
Wave Number ◽  
Mean Flow ◽  
Excited Wave ◽  
Propagating Waves ◽  
Zonal Wave Number ◽  
The Mean

AbstractThe eastward- and westward-traveling 10-day waves with zonal wavenumbers up to 6 from surface to the middle mesosphere during the recent 12 years from 2007 to 2018 are deduced from MERRA-2 data. On the basis of climatology study, the westward-propagating wave with zonal wave number 1 (W1) and eastward-propagating waves with zonal wave numbers 1 (E1) and 2 (E2) are identified as the dominant traveling ones. They are all active at mid- and high-latitudes above the troposphere and display notable month-to-month variations. The W1 and E2 waves are strong in the NH from December to March and in the SH from June to October, respectively, while the E1 wave is active in the SH from August to October and also in the NH from December to February. Further case study on E1 and E2 waves shows that their latitude–altitude structures are dependent on the transmission condition of the background atmosphere. The presence of these two waves in the stratosphere and mesosphere might have originated from the downward-propagating wave excited in the mesosphere by the mean flow instability, the upward-propagating wave from the troposphere, and/or in situ excited wave in the stratosphere. The two eastward waves can exert strong zonal forcing on the mean flow in the stratosphere and mesosphere in specific periods. Compared with E2 wave, the dramatic forcing from the E1 waves is located in the poleward regions.

A thermoelastic junction problem in a thin-walled structure: asymptotic analysis

2009 ◽  
Vol 465 (2104) ◽  
pp. 1309-1321 ◽  
Author(s):  
V.V Zalipaev ◽  
I.S Jones ◽  
A.B Movchan
Keyword(s):  
Thermal Loading ◽  
Transmission Condition ◽  
Middle Part ◽  
Asymptotic Model ◽  
Layer Model ◽  
Time Harmonic ◽  
Thin Walled ◽  
Surface Breaking Crack ◽  
Effective Transmission ◽  
Crack Defect

The two-dimensional model for a thin-walled structure in the plane strain time-harmonic case is discussed. A model of a surface crack defect subjected to oscillatory thermal loading in the middle part of the thin-walled bridges is presented. As a first part of the asymptotic model, the effective transmission condition in the vicinity of a deep surface-breaking crack in a thin-walled bridge is discussed. Then, the two-term boundary layer model determining the asymptotic behaviour of the field near the tip of the crack is constructed.

Raman spectroscopy method for subsurface detection of food powders through plastic layers

2017 ◽  
Author(s):  
Sagar Dhakal ◽  
Kuanglin Chao ◽  
Jianwei Qin ◽  
Walter F. Schmidt ◽  
Moon S. Kim ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Spectroscopy Method ◽  
Food Powders ◽  
Subsurface Detection

Subsurface detection of opaque and solid material defect based on photoacoustic effect

2020 ◽  
Vol 15 (04) ◽  
pp. P04010-P04010
Author(s):  
A. Setiawan ◽  
F.D. Setiaji ◽  
D.B. Nugroho ◽  
C.A. Riyanto ◽  
N.A. Wibowo
Keyword(s):  
Solid Material ◽  
Photoacoustic Effect ◽  
Subsurface Detection

Two Analog Transmission Schemes for Distributed Detection

2014 ◽  
Vol 596 ◽  
pp. 803-806
Author(s):  
Xiang Yang Liu ◽  
Pei Sheng Zhu ◽  
Wei Liu
Keyword(s):  
Channel State Information ◽  
Fading Channel ◽  
Detection System ◽  
Transmission Condition ◽  
Detection Performance ◽  
Distributed Detection ◽  
Transmission Scheme ◽  
Channel State ◽  
State Information ◽  
Analog Transmission

In order to improve the detection performance of distributed detection system under noisy fading channel, two analog transmission schemes, i.e. an analog transmission and a modified analog transmission, were proposed. Simulations show that, when the channel SNR is high, such as larger than 20dB, the system with the proposed analog transmission scheme can approach that with ideal transmission condition in detection performance. For low channel SNR, such as less than 10dB, the modified analog transmission scheme results in better detection performance than the binary transmission scheme proposed in literature. Therefore, according to the channel state information at the sensor, the sensor can select appropriate transmission scheme to improve the system’s detection performance.

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