Jiangping Liu

Inner Mongolia Agricultural University

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Jianghai Xia

Zhejiang University

Yinhe Luo

China University of Geosciences

Yixian Xu

Zhejiang University

Qingsheng Liu

Soochow University

Sasho Gligorovski

Guangzhou Institute of Geochemistry

Fei Cheng

Sichuan University

Fei Cheng

China University of Geosciences

Richard D. Miller

Kansas Geological Survey

Xinming Wang

Guangzhou Institute of Geochemistry

Gwendal Loisel

Guangzhou Institute of Geochemistry

Cooperative Institutions

Chinese Academy of Sciences

China University of Geosciences

University of Chinese Academy of Sciences

Guangzhou Institute of Geochemistry

Huazhong University of Science and Technology

Zhejiang University

Jinan University

Inner Mongolia Agricultural University

Sichuan University

Shanghai Jiao Tong University

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Datum Level and NMO Corrections to Shallow Seismic Reflection Data on Rugged Topography

Journal of Earth Science (2018)

Jiangping Liu Xia Jianghai Chao Chen Zhang Suxin

Normal moveout

Reflection

Midpoint

Elevation (ballistics)

Time shifting

Statics

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Citations (0)

Combining elevation and NMO corrections to shallow seismic reflection data on rugged topography

Jiangping Liu Jianghai Xia Chao Chen

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2003Combining elevation and NMO corrections to shallow seismic reflection data on rugged topographyAuthors: Jiangping LiuJianghai XiaChao ChenJiangping LiuChina University of Geosciences, Jianghai XiaKansas Geological Survey, The University of Kansas, and Chao ChenChina University of Geoscienceshttps://doi.org/10.1190/1.1817512 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Permalink: https://doi.org/10.1190/1.1817512FiguresReferencesRelatedDetails SEG Technical Program Expanded Abstracts 2003ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2003 Pages: 2452 publication data© 2003 Copyright © 2003 Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished: 03 Jan 2005 CITATION INFORMATION Jiangping Liu, Jianghai Xia, and Chao Chen, (2003), "Combining elevation and NMO corrections to shallow seismic reflection data on rugged topography," SEG Technical Program Expanded Abstracts : 1259-1262. https://doi.org/10.1190/1.1817512 Plain-Language Summary PDF DownloadLoading ...

Elevation (ballistics)

Reflection

10.1190/1.1817512

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Pattern search algorithms for nonlinear inversion of high-frequency Rayleigh-wave dispersion curves

Computers & Geosciences (2007)

Xianhai Song Hanming Gu Xueqiang Zhang Jiangping Liu

Rayleigh Wave

Maxima and minima

10.1016/j.cageo.2007.05.019

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Citations (44)

Inorganic Ions Enhance the Number of Product Compounds through Heterogeneous Processing of Gaseous NO₂ on an Aqueous Layer of Acetosyringone

Environmental Science & Technology (2022)

Pan Li Hongwei Pang Yiqun Wang Huifan Deng Jiangping Liu

Methoxyphenols represent important pollutants that can participate in the formation of secondary organic aerosols (SOAs) through chemical reactions with atmospheric oxidants. In this study, we determine the influence of ionic strength, pH, and temperature on the heterogeneous reaction of NO2 with an aqueous film consisting of acetosyringone (ACS), as a proxy for methoxyphenols. The uptake coefficient of NO2 (50 ppb) on ACS (1 × 10-5 mol L-1) is γ = (9.3 ± 0.09) × 10-8 at pH 5, and increases by one order of magnitude to γ = (8.6 ± 0.5) × 10-7 at pH 11. The lifetime of ACS due to its reaction with NO2 is largely affected by the presence of nitrate ions and sulfate ions encountered in aqueous aerosols. The analysis performed by membrane inlet single-photon ionization-time-of-flight mass spectrometry (MI-SPI-TOFMS) reveals an increase in the number of product compounds and a change of their chemical composition upon addition of nitrate ions and sulfate ions to the aqueous thin layer consisting of ACS. These outcomes indicate that inorganic ions can play an important role during the heterogeneous oxidation processes in aqueous aerosol particles.

Inorganic ions

10.1021/acs.est.1c08283

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Citations (9)

Evolution of Indoor Cooking Emissions Captured by Using Secondary Electrospray Ionization High-Resolution Mass Spectrometry

Environmental Science & Technology Letters (2020)

Jiafa Zeng Zhujun Yu Majda Mekić Jiangping Liu Sheng Li

Cooking emissions represent a major source of air pollution in the indoor environment and exhibit adverse health effects caused by particulate matter together with volatile organic compounds (VOCs). A multitude of unknown compounds are released during cooking, some of which play important roles as precursors of more hazardous secondary organic aerosols in indoor air. Here, we applied secondary electrospray ionization high-resolution mass spectrometry for real-time measurements of VOCs and particles from cooking peanut oil in the presence of 300 ppbv nitrogen oxides (NOx) generated by a gas stove in an indoor environment. More than 600 compounds have been found during and after cooking, including N-heterocyclic compounds, O-heterocyclic compounds, aldehydes, fatty acids, and oxidation products. Approximately 200 compounds appeared after cooking and were hence secondarily formed products. The most abundant compound was 9-oxononanoic acid (C9H16O3), which is likely the product formed during the heterogeneous hydroxyl (OH) radical oxidation of oleic acid (C18H34O2) or linoleic acid (C18H32O2). Real-time detection of an important number of organic compounds in indoor air poses a challenge to indoor air quality and models, which do not account for this extremely large range of compounds.

Stove

Levoglucosan

10.1021/acs.estlett.0c00044

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Citations (45)

Estimation of shallow subsurface shear-wave velocity by inverting fundamental and higher-mode Rayleigh waves

Soil Dynamics and Earthquake Engineering (2007)

Xianhai Song Hanming Gu Jiangping Liu Xueqiang Zhang

Rayleigh Wave

Mode (computer interface)

Phase velocity

Group velocity

10.1016/j.soildyn.2006.12.003

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Citations (63)

Seismic Fault Interpretation Using Deep Learning-Based Semantic Segmentation Method

IEEE Geoscience and Remote Sensing Letters (2020)

Guang Hu Zhengwang Hu Jiangping Liu Cheng Fei Daicheng Peng

Seismic fault detection is indispensable for exploring reservoirs of hydrocarbons, and a considerable amount of research has thus been devoted to it. With the rapid development of deep learning in recent years, researchers have begun using convolutional neural networks (CNNs) to identify seismic faults. However, it remains challenging for geophysical interpreters to quickly train an efficient model on a limited number of samples for fault interpretation. In this letter, we propose a workflow that uses a CNN–based method of semantic segmentation to interpret faults by using a small training set. It requires only the selection of some 2-D seismic sections from seismic volume data for interpretation and labeling to be trained to predict faults in the entire area considered. We simplified the VGG16 model to reduce training time and modified it to improve its performance. We used convolution layers instead of fully connected layers at the end of the network to implement the end-to-end classification of seismic images, and adopted dilation convolution to increase the receptive field and hybrid dilation convolution to avoid problems in it. We also applied the atrous spatial pyramid pooling (ASPP) module to further enhance the effects of segmentation. The results were subjected to postprocessing for refinement. The promising performance of the proposed method was verified on a set of real seismic data.

Convolution (computer science)

Dilation (metric space)

Geophysical Imaging

10.1109/lgrs.2020.3041301

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Citations (33)

Photoenhanced Uptake of NO₂ and HONO Formation on Real Urban Grime

Environmental Science & Technology Letters (2019)

Jiangping Liu Sheng Li Majda Mekić Haoyu Jiang Wentao Zhou

Nitrous acid (HONO) is one of the most important photochemical precursors of the hydroxyl radical in the sunlit urban atmosphere. The sources of HONO, however, are still poorly characterized, yet there is a disagreement between the field observations and the model results. Here, we show that light-induced NO2 heterogeneous chemistry on authentic urban grime can make an important contribution to the total HONO levels in the urban atmosphere. The obtained results indicate that the effective uptake coefficients of NO2 on urban grime in the presence of ultraviolet light [2.6 × 1015 photons cm–2 s–1 (300 nm < λ < 400 nm)] increased markedly from (1.1 ± 0.2) × 10–6 at 0% relative humidity (RH) to (5.8 ± 0.7) × 10–6 at 90% RH, exhibiting the following linear correlation with RH: γ(NO2) = (7.4 ± 3.3) × 10–7 + (5.5 ± 0.6) × 10–8 × RH%. The flux densities of HONO mediated by light-induced heterogeneous conversion of NO2 (46 ppb) on urban grime were enhanced by ∼1 order of magnitude from (2.3 ± 0.2) × 109 molecules cm–2 s–1 at 0% RH to (1.5 ± 0.01) × 1010 molecules cm–2 s–1 at 90% RH. This study promotes light-induced NO2 chemistry on urban grime being an important source of HONO and suggests that further experiments be performed in the future.

Nitrous acid

Ultraviolet

10.1021/acs.estlett.9b00308

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Citations (78)

Full wave field finite difference modeling of tunnel space in polar coordinates

International Geophysical Conference, Qingdao, China, 17-20 April 2017 (2017)

Yutao Liu Jiangping Liu Fei Cheng Ruidong Qin Jingtao Xie

Summary It's a difficult problem for 3D seismic full wave field numerical simulation of tunnel by using finite difference in Cartesian coordinates, since the tunnel has a special geological model that is the air-like column of tunnel. 3D seismic full wave field numerical simulation in cylindrical coordinates is an effective way to solve the problem. Due to the complexity of the 3D cylindrical coordinates, the finite difference numerical simulation of the seismic full wave field in the polar coordinate is carried out firstly. We firstly simulate the seismic full wave field of the tunnel with the finite difference in the polar coordinate and deal with the complex boundary. The finite difference algorithms using uniform step with staggered grid of second-order accuracy in time and eighth-order accuracy in space is came true. In order to eliminate the reflection of the circumferential boundary in the angular direction, the periodic boundary of polar coordinates is extended. The splitting PML is used to absorb the circumferential boundary in the radial direction. Acoustic-elastic boundary approach is applied for the free surface between the tunnel and surrounding rock. Finally, the paper simulates the full wave field of the karst cave geological model in polar coordinates.

Polar coordinate system

Finite difference

10.1190/igc2017-250

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Citations (2)

Elastic impedance inversion from robust regression method

Charles Prisca Samba Jiangping Liu

As in two terms AVO inversion, the linear fit of set of logarithm elastic impedance versus the sinus square of incidence angle have been used to extract elastic parameters .This way based on minimum least square sense, though very efficient ,gives optimal results when staying in Gaussian context. Unfortunately, the Gaussian distribution proves sometimes to be inexact on real data often affected by noises that create outliers and thus distort inversion results. In this paper, we introduce the one popular robust technique; the so-called M-estimators to deal with outliers. On synthetic elastic impedance (EI) data in which fours outliers have been added to far angles, the Andrews estimator gives the best results than Hubert estimator. From this observation, the Andrew estimator has been used to real seismic data and the inversion results are very stable. (Journal of American Science 2010; 6(9):713-718). (ISSN: 1545-1003).

Robust regression

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