A5103111045- Seismic Waves and Analysis
- Seismic Imaging and Inversion Techniques
- Electronic Packaging and Soldering Technologies
- 3D IC and TSV technologies
- Geophysics and Sensor Technology
- Engineering Applied Research
- Material Properties and Processing
- Ultrasonics and Acoustic Wave Propagation
- Acoustic Wave Phenomena Research
- Vibration and Dynamic Analysis
- Advanced Welding Techniques Analysis
- Microwave Engineering and Waveguides
- Seismology and Earthquake Studies
- Welding Techniques and Residual Stresses
- Advanced Measurement and Detection Methods
- Railway Engineering and Dynamics
- Aerodynamics and Acoustics in Jet Flows
- Hepatocellular Carcinoma Treatment and Prognosis
- Transport and Logistics Innovations
- Earthquake Detection and Analysis
- Geotechnical Engineering and Underground Structures
- Infrared Target Detection Methodologies
- Powder Metallurgy Techniques and Materials
- CCD and CMOS Imaging Sensors
- Internet of Things and Social Network Interactions
Southern University of Science and Technology
2018-2025
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)
2021-2023
Zhejiang University
2022
First Affiliated Hospital Zhejiang University
2022
China Electronics Technology Group Corporation
2015-2020
Beijing University of Posts and Telecommunications
2019
University of Science and Technology of China
2018
Inner Mongolia University of Technology
2012
First People’s Hospital of Jingmen
2012
Peking University
2005
Surface wave inversion based on dispersion curves of higher modes is increasingly being applied to estimate near-surface S-wave velocity structures using active or passive sources. Moreover, sensitivity analysis important for estimating the confidence inverted results. In this study, we define a function and kernel, give their analytic expressions then propose method results redesign initial structure through analysis. Three kinds common layered models [velocity-increasing-with-depth...
Abstract In the past two decades, seismic ambient-noise cross correlation (CC) has been one of most important technologies in seismology. Usually, only fundamental-mode surface-wave dispersion was extracted from ambient noise. Recently, with frequency–Bessel transform (F-J) method, overtone can also be noise and it adds significant value inversion. This method verified to effective for array records earthquake events. this article, we describe our algorithm a Python package called CC-FJpy....
The ocean bottom cable (OBC) acquisition technique has become a significant geophysical method to simultaneously record geophone and hydrophone signals. signals have been used by many surface wave dispersion inversion methods for seafloor imaging. However, geophones are not always perfectly coupled seabed, which can lead low-quality or unavailable In contrast, hydrophones naturally sea water pressure disturbances induced Scholte waves propagating on the ocean-bottom interface. We attempt...
Search space design is a fundamental procedure for the inverse problem in Rayleigh wave exploration. In practice, such crucial task mainly depends on researchers' experience-based judgment. However, intricate near-surface materials may lead to erroneous search design, and consequently, accurate inversion results cannot always be ensured. By forward calculation, it found that there strong relationship between dispersion curves of given earth model its miniature model; namely, if parameters...
The northwestern Bohemian Massif and adjacent areas are a tectonically active region associated with complex geodynamic activities, that manifest as Quaternary volcanism, earthquake swarms in the upper middle crust, degassing of CO 2 , crustal fluid migration. intricate tectonic evolution activities this reflect complexity structure therein. However, models derived from previous studies area offer different, even contradictory information regarding existence mid-crustal low-velocity zone...
Abstract The salinity of groundwater in Qinzhou Bay has been increasing since 2013. This phenomenon affects livelihoods and the local agricultural economy, specifically Longmengang area. In this work, we investigate causes water salinization to provide evidence for effectively managing resources improving quality. We collected 110 samples from spatially distributed wells, rivers, reservoirs, sea, conducted a hydrochemical study complemented by numerical modeling. found that pumping...
ABSTRACT The curvilinear-grid finite-difference method (FDM), which uses curvilinear coordinates to discretize the nonplanar interface geometry, is extended simulate acoustic and seismic-wave propagation across fluid–solid at sea bottom. coupled velocity-pressure elastic velocity-stress formulation that governs wave in seawater solid earth expressed coordinates. solved on a collocated grid by alternative applications of forward backward MacCormack finite difference within fourth-order...
The conventional surface wave inversion methodology relying upon dispersion curve analyses is frequently confounded by the phenomenon known as "mode kissing" well absorptive properties of seismic waves traversing near-surface geologic strata. We propose a deep learning approach to overcome challenges in due complex geology. A convolutional neural network regression model developed directly map spectra shear velocity profiles. takes entire spectrograms input, avoiding issues from manual...
Abstract The frequency-bessel transform surface wave tomography method has emerged as a novel for imaging during the past few years. This technique facilitates large-scale crust-mantle structures and enables shallow engineering exploration. Compared to conventional methods like SPAC, it markedly enhances quality of dispersion curve, particularly in higher mode, enhancing reliability inversion. Its active passive source data processing integration is noteworthy, significantly broadening...
Shear-wave (S-wave) velocity is considered an essential parameter for the study of earth, and Rayleigh wave inversion has been widely accepted used to determine it. Given high-quality measured dispersion curves, performance depends on applied optimization algorithm inside process. We propose a novel framework promote efficient accurate inversion, i.e., two-stage broad learning (TS-BL). The proposed TS-BL not only inherits powerful mapping capability simple configured structure (BL) network...
Patients receiving liver transplantation (LT) for hepatocellular carcinoma (HCC) are at high risk of tumor recurrence. Polyploidy is a fascinating characteristic the and correlates with HCC development progression. This study aims to investigate association between hepatocyte polyploidy spectrum recurrence after LT.Thirty-two paired HCC, peritumoral, cirrhotic, normal specimens were employed examine polyploidization pattern during tumorigenesis. Clinicopathological implications LT recipients...
As a highly reliable hermetic sealing method, parallel seam welding has an increasingly important application in the ceramic packaging industry. For thin-walled package, structural strength itself is relatively weak, and high energy instantaneously generated during process will cause thermal shock to package while completing sealing. In subsequent reliability test, residual stress accumulated finally released, resulting reduction of casing, air leakage or even porcelain cracking. this paper,...
Abstract Effective extraction of higher mode dispersion information has been a research hotspot in the study surface waves. In this study, we introduce novel approach refining Rayleigh wave modes by using seismoelectric signals, namely, electromagnetic (EM) signals originating from conversion. Adopting weight‐drop source, simulate seismic and EM for several porous models. An extended version frequency‐Bessel transform method is introduced to extract signals. Results suggest that evanescent...
In this paper, the steady equivalent thermal circuit model of Ceramic Quad Flat No-lead (CQFN) has been done. 3D CQFN48 was set up and analyzed by finite element method. The influencing factors CQFN packages for resistance (θ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">JC</inf> ) were pointed out. It is concluded that package can be reduced reducing ceramic substrate thickness adequately, enlarging Wpost diameter, adding array spacing, etc.
Rayleigh wave dispersion energy spectra have been widely used to extract curves and invert underground S-wave velocity structures for engineering geophysics seismology. We develop a frequency-Hankel (F-H) transform method high-quality multimodal from active passive source data. The F-H is inspired by the frequency-Bessel (F-J) considers physical meaning of Green’s functions analysis. can naturally avoid crossed artifacts caused converging waves on F-J spectrograms obtain more same quality...
Earth and Space Science Open Archive This work has been accepted for publication in Seismological Research Letters. Version of RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v1]CC-FJpy: A Python Package seismic ambient noise cross-correlation frequency-Bessel transform...
We have developed a robust and reliable method for determining borehole shape from six-arm caliper logs. Four- calipers are the common tools used in open-hole logging. They provide information about wellbore geometry that is important petrophysical geomechanical analyses. The analysis procedure four-arm logs well-established, but can be troublesome complex hole environments containing breakouts or keyseats when tool off center. challenge with how to remove effect of decentralization, which...
With Ceramic Quad Flat No-lead packaging structure as the research object, using finite element method on distribution of stress and strain in temperature cycle test simulation analysis, analyzed thickness printed circuit board, size package, form lead range change influence solder joints reliability. Based results, fatigue life CQFN under cyclic loading is calculated. Results show that by increasing PCB, reasonable selection package try to reduce range, can effectively improve thermal...