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| 1 | Site effects on earthquake ground motion based on microtremor measurements for metropolitan Beijing显示文摘A campaign of microtremor measurements was conducted in summer 2007 for assessing local site effects of seismic strong ground motion in metropolitan Beijing. Using the measurements from over 600 sites with approximately 1―2 km spacing covering the entire area inside Beijing’s 5th Beltway, we present the analysis results in the form of contours of the predominant resonant frequency, the thick- ness of the uppermost soft sediments, and the ground motion amplification factor. The microtremor- derived soft sediment thickness is generally in agreement with previous results based on much sparser borehole data, with the revealing of more short-wavelength undulations, which coincide with major geomorphological and neotectonic expressions in metropolitan Beijing. This study provides additional valuable information to the earthquake-resistant design of civil infrastructures and seismic hazard response in metropolitan Beijing. It also provides a feasible geophysical approaching to explore the 3-D structure beneath metropolitan cities. | CHEN QiFu LIU LanBo WANG WeiJun ROHRBACH Eric | 2009 | Chinese Science Bulletin2009，54，2： | 15 |
| 2 | Ambient noise as the new source for urban engineering seismology and earthquake engineering: a case study from Beijing metropolitan area显示文摘In highly populated urban centers, traditional seismic survey sources can no longer be properly applied due to restrictions in modern civilian life styles. The ambient vibration noise, including both microseisms and microtremor, though are generally weak but available anywhere and anytime, can be an ideal supplementary source for conducting seismic surveys for engineering seismology and earthquake engineering. This is fundamentally supported by advanced digital signal processing techniques for effectively extracting the useful information out from the noise. Thus, it can be essentially regarded as a passive seismic method. In this paper we first make a brief survey of the ambient vibration noise, followed by a quick summary of digital signal processing for passive seismic surveys. Then the applications of ambient noise in engineering seismology and earthquake engineering for urban settings are illustrated with examples from Beijing metropolitan area. For engineering seismology the example is the assessment of site effect in a large area via microtremor observations. For earthquake engineering the example is for structural characterization of a typical reinforced concrete high-rise building using background vibration noise.By showing these examples we argue that the ambient noise can be treated as a new source that is economical, practical, and particularly valuable to engineering seismology and earthquake engineering projects for seismic hazard mitigation in urban areas. | Lanbo Liu Qi-fu Chen Weijun Wang Eric Rohrbach | 2014 | Earthquake Science2014，27，1： | 7 |
| 3 | Applications of the Hilbert-Huang Transform for Microtremor Data Analysis Enhancement显示文摘In this paper we discuss the use of the Hilbert-Huang transform(HHT) to enhance the time-frequency analysis of microtremor measurements. HHT is a powerful algorithm that combines the process of empirical mode decomposition(EMD) and the Hilbert transform to compose the HilbertHuang spectrum that contains the time-frequency-energy information of the recorded signals. HHT is an adaptive algorithm and does not require the signals to be linear or stationary. HHT is advantageous for analyzing microtremor data, since observed microtremors are commonly contaminated by nonstationary transient noises close to the recording instruments. This is especially true when microtremors are measured in an urban environment. In our data processing HHT was used to(1) eliminate the unwanted short-duration transient constituents from microtremor data and use only the coherent portion of the data to carry out the widely used horizontal to vertical spectral ratio(H/V) method;(2) identify and eliminate the continuous industrial noise in certain frequency band; and(3) enhance the H/V analysis by using the Hilbert-Huang spectrum(HHS). The efficacy of this proposed approach is demonstrated by the examples of applying it to microtremor data acquired in the metropolitan Beijing area. | Lanbo Liu Robert Mehl Weijun Wang Qi-Fu Chen | 2015 | Journal of Earth Science2015，26，6： | 4 |
| 4 | Methane conversion under cold plasma over Pd-containing ionic liquids immobilized on γ-Al_2O_3显示文摘Pd-containing ionic liquid(IL) 1-hexyl-3-methylimidazolium tetrafluoroborate(C6MIMBF4) immobilized on 7-Al2O3(Pd-IL/γ-Al2O3) was prepared and characterized by Fourier transform infrared spectroscopy(FTIR),scanning electron microscopy(SEM) and Brunauer-Emmett-Teller (BET) analysis.The influences of C6MIMBF4 loading and Pd on methane conversion to C2 hydrocarbons under cold plasma were investigated.FTIR and SEM analyses indicated that C6MIMBF4 had been successfully immobilized on 7-Al2O3 and the C6MIMBF4 showed excellent stability under cold plasma.The results of BET and methane conversion showed that with the increase in immobilization amount of C6MIMBF4 ontoγ-Al2O3,the specific surface area and pore volume of IL/γ-Al2O3 decreased,while the selectivity and yield of C2 hydrocarbons increased.The selectivity of C2 hydrocarbons was 94.6%when the loading of C6MIMBF4 was 40%,and the percentage of C2H4 in C2 hydrocarbons was as high as 64%when using Pd-IL/γ-Al2O3 as a catalyst with no conventional thermal reduction treatment. Optical emission spectra(OES) from the cold plasma reactor during methane conversion were also studied.The results indicated that the intensity of the C2,CH,H,and C active species from methane and hydrogen decomposition increased when IL/γ-Al2O3 or Pd-IL/γ-Al2O3 was introduced into the plasma system.Based on the analyses of the gas product and OES spectra,it can be concluded that the surface catalyzed reactions between plasma and ionic liquid were very important for the reduction of Pd2+ and the formation of C2H4. | Xiuling Zhang Lanbo Di Qian Zhou | 2013 | Journal of Energy Chemistry2013，22，3： | 2 |
| 5 | Polycomb group proteins and their roles in carcinogenesis显示文摘In the cell nucleus,DNA is wound around histone proteins,which are then packed together to form chromatin.Histones can be chemically tagged by methyl and acetyl groups.Polycomb group (PcG) proteins attach methyl groups to genes,which block their activity.This is similar to the attachment of methyl groups to gene promoters by DNA methyltransferases (DNMTs).This action is directly linked with tumor initiation and metastasis via the promotion of anti-senescence and anti-apoptosis pathways,and by facilitating epithelial mesenchymal transition (EMT).Cell fate transcriptional factors (CFTFs) and long non-coding RNAs (long ncRNAs) recruit PcG proteins to the promoters of tumor suppressor genes,resulting in epigenetic gene silencing by influencing chromatin structure and DNA accessibility.Thus,PcG proteins are potential diagnostic markers and targets for new chemoprevention and therapeutic strategies. | XIAO LanBo 1,2,3,TAO YongGuang 1,2,3,LI LiLi 1,2,3,4 & CAO Ya 1,2,31 Key Laboratory of Carcinogenesis of Ministry of Health,Xiangya School of Medicine,Central South University,Changsha 410078,China 2 Key Laboratory of Carcinogenesis and Cancer Invasion of Ministry of Education,Xiangya School of Medicine,Central South University,Changsha 410078,China 3 Cancer Research Institute,Xiangya School of Medicine,Central South University,Changsha 410078,China 4 Cancer Epigenetics Laboratory,State Key Laboratory in Oncology in South China,Chinese University of Hong Kong,Hong Kong 999077,China | 2012 | Chinese Science Bulletin2012，57，18： | 2 |
| 6 | The chemical chaperon 4-phenylbutyric acid ameliorates hepatic steatosisthrough inhibition of de novo lipogenesis in high-fructose-fed rats显示文摘 | Lu-Ping Ren Guang-Yao Song Zhi-Juan Hu Mingming Zhang Lanbo Peng Shu-Chun Chen Limin Wei Fan Li Wen Sun | 2013 | International Journal of Molecular Medicine2013，，： | 2 |
| 7 | Partially crystallized Pd nanoparticles decorated TiO_2 prepared by atmospheric-pressure cold plasma and its enhanced photocatalytic performance显示文摘TiO_2 decorated with partially crystallized Pd nanoparticles(Pd/TiO_2-P) was successfully prepared by atmospheric-pressure dielectric barrier discharge cold plasma. The XRD and XPS analyses proved that Pd ions were reduced to partially crystallized metallic Pd nanoparticles in Pd/TiO_2-P. The XPS spectra also indicated that an enhanced metal-support interaction was formed due to the existence of partially crystallized Pd nanoparticles with lower coordination number in Pd/TiO_2-P. Photocatalytic activity of Pd/TiO_2-P was much higher than that of TiO_2 samples decorated with well crystallized Pd nanoparticles. | Zhijian Xu Bin Qi Lanbo Di Xiuling Zhang | 2014 | Journal of Energy Chemistry2014，23，6： | 2 |
| 8 | Nonlinear Inversion of Borehole-radar Tomography Data to Reconstruct Velocity and Attenuation Distribution in Earth Materials显示文摘 | Zhou Chaoguang Liu Lanbo Lane J W | 2001 | Journal of Applied Geophysics2001，47，34： | 1 |
| 9 | Antibody profiles characteristic of mycobacterium tuberculosis infection state显示文摘 | Amy D Ganga VK Lanbo S | | Infect Immun0，73，10： | 1 |
| 10 | Antibody profiles characteristic of Mycobacterium tuberculosis Infection state 显示文摘 | Davidow A Ganga VK Lanbo s hi | 2005 | Infection and Immunity2005，73，10： | 1 |
| 11 | Prognostic value of nutritional status in chronic obstructive pulmonary disease 显示文摘 | Lanbo C Prescott E Lange D | 1999 | Am J Respir Crit Care Med1999，160，6： | 1 |
| 12 | Arcone, Numerical simulation of the wave-guide effect of the near-surface thin layer on radar wave propagation显示文摘 | Lanbo Liu Steve A | 2003 | JEEG2003，8，2： | 1 |
| 13 | Nonlinear inversion of borehole-radar tomagraphy data to reconstruct velocity and attenuation distribution in earth materials显示文摘 | Zhou Chaoguang Liu Lanbo Lane Jr J W | 2001 | Journal of Applied Geophysics2001，47，： | 1 |
| 14 | Near-Surface Anisotropic Structure Characterization by Love Wave Inversion for Assessing Ground Conditions in Urban Areas显示文摘In many geophysical applications, neglecting of anisotropy is somehow an oversimplification. The mismatch between prediction based on isotropic theory and near-surface seismic observations indicates the need for the inclusion of medium anisotropy. In this paper, surface wave(Love wave) dispersion properties are used to estimate the anisotropic structure of the near-surface layered earth, which is modeled as media possess vertical transverse isotropy(VTI), a reasonable assumption for near-surface sedimentary layers. Our approach utilizes multi-mode surface waves to estimate both the velocity structure and the anisotropy structure. This approach consists of three parts. First, the dispersion analysis is used to extract dispersion curves from real data. Second, the forward modeling is carried out based on the dispersion equation of Love wave in a multi-layered VTI medium. Dispersion curves of multi-modes, which are the numerical solutions of the dispersion equation, are obtained by a graphic-based method. Finally, the very fast simulated annealing(VFSA) algorithm is used to invert velocity structure and anisotropy structure simultaneously. Our approach is verified by the synthetic dispersion curve generated by a VTI medium model. The estimation of shear wave velocity and anisotropy structure of surface wave data acquired at Rentschler Field, an urban center site on sediments in the Connecticut River valley reveals a simple structure of the sediment layer over a bedrock half space. The results are verified by other inversion results based on different data set obtained on the same site. The consistency of inversion results shows the feasibility and efficiency of the approach. | Hao Xie Lanbo Liu | 2015 | Journal of Earth Science2015，26，6： | 1 |
| 15 | Antibody Profiles Characteristic of Mycobacterium tuberculosis Infection State显示文摘 | Amy Davidow Ganga V Kanaujia Lanbo Shi | 2005 | Infection and Immunity2005，73，10： | 1 |
| 16 | Prospects and peoblems of wirless communications for underwater sensor networks显示文摘 | Lanbo Liu Shengli Zhou Jun-hong Cui | 2008 | Wireless Communication and Mobile Computing2008，8，8： | 1 |
| 17 | Dry plasma reduc- tion to prepare a high performance Pd/C catalyst at atmos- pheric pressure for CO oxidation 显示文摘 | QI BIN DI LANBO XU WEIJIE | 2014 | Journal of Materials Chemistry A2014，2，11： | 1 |
| 18 | A facile method for preparing Pt/TiO2 photocatalyst with enhanced activity using dielectric barrier discharge显示文摘 | DI LANBO XU ZHIJIAN WANG KAI | 2013 | Catalysis To- day2013，211，4： | 1 |
| 19 | 超声波法检测挤扩支盘桩轮廓形态模型试验显示文摘通过设计制作支盘桩模型进行超声波跨孔法检测支盘桩轮廓尺寸可行性试验。利用超声波透射法采集导管间介质的超声波行程时间和波形等特征,据此判断桩体外轮廓形态。研究表明,波列图首波线形状与模型桩体轮廓对应,初至波线所描绘的轮廓与支盘桩实际轮廓基本吻合,可以用来初步判断桩体外轮廓的形态;检测超声波的传播方向对桩体轮廓尺寸检测结果无显著影响,对接收到的超声波的能量有一定影响,进而影响声测管的有效距离;在本模型桩试验条件下,可假定超声波沿直线穿越介质接触界面,由此建立的桩体轮廓尺寸计算公式的精度能够满足工程桩轮廓检测的需要。 | 李勇 贵宁 李国维 熊力 杨永清 LIU Lanbo 寇英新 | 2022 | 中国测试2022，48，11： | 1 |
| 20 | Radar attenuation tomography using the centroid frequency downshift method显示文摘 | LIU Lanbo John WL QUAN Youli | 1998 | Journal of Applied Geophysics1998，40，13： | 1 |
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