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Crustal structure study based on principal component analysis of receiver functions

Science China Earth Sciences 2019年第7期62卷 1110-1124页

作者： jianyong zhang Ling CHEN Xu WANG State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences University of Chinese Academy of Sciences CAS Center for Excellence in Tibetan Plateau Earth Sciences

The receiver function(RF) technique is an effective method for studying crustal structure. For a single station, the average 1-D crustal structure is usually derived by stacking the radial RFs from all back-azimuths, whereas structural variations(such as dipping discontinuities or anisotropy) can be constrained through analysis of waveform dependence on the backazimuth of both the radial and tangential RFs. However, it is often difficult to directly extract information about structural variations from the waveform of RF, due to the common presence of noise in real data. In this study, we proposed a new method to derive structural variation information for individual stations by applying principal component analysis(PCA) to RFs sorted by back-azimuth. In this method(termed as RF-PCA), a set of principal components(PCs), which are uncorrelated with each other and reflect different characteristics of the RF data, were extracted and utilized separately to reconstruct new RFs. Synthetic tests show that the first PC of the radial RFs contains the average structural information of the crust beneath the corresponding station, and the second PC of the radial RFs and the first PC of the tangential RFs both reflect the variations of the crustal structure. Our synthetic modeling results indicate that the new RF-PCA method is valid for a variety of synthetic models with intra-crustal dipping discontinuities and/or anisotropy. We applied this method to the real data from a broadband temporary seismic station(s233) in the central part of the Sichuan Basin. The results suggest that the RF data can be best explained by the presence of two nearly parallel dipping discontinuities within the crust. Combining with previous logging data, seismic exploration and deep sounding observations, we interpret the shallow dipping discontinuity as the top boundary of the Precambrian crystalline basement of the Sichuan Basin and the deep one corresponding to the Conrad interface between the upper a

关键词： Principal component analysis Receiver function Crustal structure Dipping discontinuity Anisotropy Sichuan Basin

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From Zeolitic Imidazolate Framework-8 to Metal-Organic Frameworks (MOFs): Representative Substance for the General Study of Pioneering MOF Applications

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Energy & Environmental Materials 2018年第4期1卷 209-220页

作者： Dianting Zou Dingxin Liu jianyong zhang MOE Key Laboratory of Polymeric Composite and Functional Materials School of Materials Science and EngineeringSun Yat-Sen UniversityGuangzhou 510275China

Metal-organic frameworks(MOFs)have been intensely studied for the past few decades as an enormous family of highly tunable porous materials with promisingly applicable functionalities in adsorption,separation,catalysis,sensing,electrochemistry,and a great number of emerging *** a classic MOF,zeolitic imidazolate framework-8(ZIF-8)is conventionally one of the very few MOF members that has been commercialized with considerable production.

关键词： metal-organic frameworks nanoporous composites zeolitic imidazolate frameworks zeolitic imidazolate framework-8

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Coordination-Driven Terpyridyl Phosphine Pd(Ⅱ) Gels

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Chinese Journal of Chemistry 2015年第1期33卷 141-146页

作者： Hongmiao Li Xin Tan jianyong zhang KLGHEI of Environment and Energy Chemistry School of Chemistry and Chemical EngineeringSun Yat-Sen UniversityGuangzhouGuangdong 510275China

Incorporation of phosphine-Pd catalytic centers in gel network is an important strategy to develop highly active *** this contribution we show that catalytically active phosphine-Pd(II)gels can be readily obtained via re-action of rigid bridging terpyridyl phosphines and Pd(II).The terpyridyl phosphines,Py2P2 and Py2P,contain one 4,2':6',4"-terpyridyl group and two/one diphenylphosphino *** of Py2P2/Py2P and Pd(II)in CHCl_(3)-MeOH afforded the corresponding phosphine-Pd(II)gels at room temperature or at elevated temperature(40℃).The gelation is driven by formation of metal-organic *** heating is important in triggering the formation of Py2P-Pd(II)*** gels have a coherent,rigid spongy porous network of continuous nanome-ter-sized *** phosphine-Pd(II)gels showed high activity in the Suzuki-Miyaura reactions of aryl bro-mides under ambient conditions and could be recycled and reused.

关键词： metal-organic gel phosphine palladium coordination polymer supported catalysis

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Continuous flow synthesis of porous materials

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Chinese Chemical Letters 2020年第6期31卷 1448-1461页

作者： Yu Xin Sheng Peng Junxing Chen Zujin Yang jianyong zhang MOE Laboratory of Polymeric Composite and Functional Materials School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China

Porous materials play an important role in chemical catalysis,separation and other industrial ***-efficiency preparation of porous materials has become an active research *** synthesis of porous materials has been dominated by one-pot solution processing conditions carried out by bulk mixing under conventional electric heating via hydrothermal,solvothermal or ionothermal reactions where high temperatures and pressures are the *** flow synthesis has many key advantages in terms of efficient mass and heat transfer,precise control of residence times,improved opportunities for automation and feedback control of synthesis,scaling-up reactions and improved safety parameters compared to above mentioned conventional batch scale synthetic *** this review,continuous flow synthesis of various crystalline porous materials such as metal-organic frameworks(MOFs),covalent-organic frameworks(COFs),porous organic cages and zeolites is *** of microfluidic methods with other techniques are also shown including various heating ways and various methods of substrate adding.

关键词： Porous materials Continuous flow Metal-organic frameworks Zeolites Covalent-organic frameworks

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Low Complexity Detection Algorithms Based on ADMIN for Massive MIMO

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China Communications 2023年第11期20卷 67-77页

作者： Shuchao Mi jianyong zhang Fengju Fan Baorui Yan Muguang Wang Institute of Lightwave Technology Beijing Jiaotong UniversityBeijing 100044China Key Lab of All Optical Network and Advanced Telecommunication of EMC Beijing Jiaotong UniversityBeijing 100044China

This paper proposes the alternating direction method of multipliers-based infinity-norm(ADMIN) with threshold(ADMIN-T) and with percentage(ADMIN-P) detection algorithms,which make full use of the distribution of the signal to interference plus noise ratio(SINR) for an uplink massive MIMO *** ADMIN-T and ADMIN-P detection algorithms are improved visions of the ADMIN detection algorithm,in which an appropriate SINR threshold in the ADMIN-T detection algorithm and a certain percentage in the ADMIN-P detection algorithm are designed to reduce the overall computational *** detected symbols are divided into two parts by the SINR threshold which is based on the cumulative probability density function(CDF) of SINR and a percentage,*** symbols in higher SINR part are detected by *** interference of these symbols is then cancelled by successive interference cancellation(SIC).Afterwards the remaining symbols with low SINR are iteratively detected by *** simulation results show that the ADMIIN-T and the ADMIN-P detection algorithms provide a significant performance gain compared with some recently proposed detection *** addition,the computational complexity of ADMIN-T and ADMIN-P are significantly ***,in the case of same number of transceiver antennas,the proposed algorithms have a higher performance compared with the case of asymmetric transceiver antennas.

关键词： ADMIN low complexity detection algo-rithm massive MIMO MMSE SINR

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A low-error calibration function for an electrostatic gas-solid flow meter obtained via machine learning techniques with experimental data

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Energy and Built Environment 2020年第2期1卷 224-232页

作者： Andrew J.Kidd jianyong zhang Ruixue Cheng School of Computing Engineering and Digital TechnologiesTeesside UniversityMiddlesbroughUnited Kingdom

In this paper,modeling and machine learning with experimental data and a novel calibration function for a gas-solid flow sensor fusion are *** fusion is the use of software that intelligently combines data from multiple sensors in order to improve overall system *** technique can be applied to measurement of mass flow rate of solids in a pipeline with non-intrusive electrostatic *** fusion from multiple heterogeneous/homogenous sensors can overcome the limitations of an individual sensor and measured *** is shown that the output voltage of a ring-shaped electrode is predominantly a function of solids mass flow rate and velocity for a flow of bulk solids in a pipeline,when particle size,properties and ambient conditions remain *** incorporating solids flow velocity in a proposed mathematical model(obtained via machine learning),meter output voltage could be predicted with superior accuracy,for wide range of different flow pa-rameters from numerous experiments with a pneumatic conveying *** the model yields a new calibration function which,when deployed in signal processing software,enables accurate mass flow measure-ment with velocity *** described method also de-necessitates determination of air solids ratio or solids volumetric concentration,thereby enabling simplification of the overall measurement system whilst yielding higher accuracy than calibration methods from previous *** flow measurement facilitates enhanced monitoring and controllability of blast furnaces,power stations,chemical reactors,process plants *** there are bulk solids flows in *** of such highly materially consumptive and energy intensive processes can yield significant reductions in waste and emissions(CO 2,NOx)and increased efficiencies in global production of energy and materials.

关键词： Sensor fusion Machine learning Electrostatic flow measurement Gas-solid flow Pneumatic conveying Multiple non-linear regression

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Active fuel design A way to manage the right fuel for HCCI engines

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Frontiers in Energy 2016年第1期10卷 14-28页

作者： Zhen HUANG Zhongzhao LI jianyong zhang Xingcai LU Junhua FANG Dong HAN Key Laboratory of Power Machinery and Engineering Ministry of Education Shanghai Jiao Tong University Shanghai 200240 China

Homogenous charge compression ignition （HCCI） engines feature high thermal efficiency and ultralow emissions compared to gasoline engines. However, unlike SI engines, HCCI combustion does not have a direct way to trigger the in-cylinder combustion. Therefore, gasoline HCCI combustion is facing challenges in the control of ignition and, combustion, and operational range extension. In this paper, an active fuel design concept was proposed to explore a potential pathway to optimize the HCCI engine combustion and broaden its operational range. The active fuel design concept was realized by real time control of dual-fuel （gasoline and n-heptane） port injection, with exhaust gas recirculation （EGR） rate and intake temperature adjusted. It was found that the cylinder- to-cylinder variation in HCCI combustion could be effectively reduced by the optimization in fuel injection proportion, and that the rapid transition process from SI to HCCI could be realized. The active fuel design technology could significantly increase the adaptability of HCCI combustion to increased EGR rate and reduced intake temperature. Active fuel design was shown to broaden the operational HCCI load to 9.3 bar indicated mean effective pressure （IMEP）. HCCI operation was used by up to 70% of the SI mode load while reducing fuel consumption and nitrogen oxides emissions. Therefore, the active fuel design technology could manage the right fuel for clean engine combustion, and provide a potential pathway for engine fuel diversification and future engine concept.

关键词： active fuel design HCCI gasoline n-heptane engine combustion

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Hydrothermal Synthesis of MoO_2 and Supported MoO_2 Catalysts for Oxidative Desulfurization of Dibenzothiophene

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China Petroleum Processing & Petrochemical Technology 2014年第4期16卷 19-23页

作者： Wang Danhong zhang jianyong Liu Ni Zhao Xin zhang Minghui Key Laboratory of Advanced Energy Materials Chemistry (MOE) College of ChemistryNankai University

A novel method for obtaining spherical MoO2 nanoparticles and SiO2-Al2O3 supported MoO2 by hydrothermal reduction of Mo(VI) species was studied. The obtained MoO2 catalysts show very high catalytic activity in the oxidative desulfurization(ODS) process. The effect of hydrothermal temperature and crystallization temperature on ODS activity was investigated. The ODS activity of supported MoO2 catalysts with various MoO2 contents were also investigated. The mechanism for formation of MoO2 involving oxalic acid was proposed.

关键词： MoO2 hydrothermal reduction oxidative desulfurization nanoparticle

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Qualitative and quantitative analyses of influenza virus receptors in trachea and lung tissues of humans,mice,chickens and ducks

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Science China(Life Sciences) 2012年第7期55卷 612-617页

作者： WANG BaoLin LIU Bo CHEN Ling zhang jianyong HE HongXuan zhang Hong Laboratory of Respiratory Medicine Department of Respiratory Medicine Affiliated Hospital of Zunyi Medical College Zunyi 563003 China National Research Center for Wildlife-borne Diseases Institute of Zoology Chinese Academy af Sciences Beijing 100101 China Z-BioMed Inc. Rockville MD 20855 USA

To accurately determine the expression and distribution patterns of two infuenza virus receptors （SAa2,3-gal and SAa2,6-gal） in trachea and lung tissues of humans, mice, chickens and ducks, we analyzed lectin immunofluorescence stainings of various tissue sections qualitatively and quantitatively. Results from the qualitative analysis showed that both influenza virus receptors were expressed in lung tissues of humans, mice, chickens and ducks as well as trachea tissues of mice and ducks. However, SAa2,6-gal receptor was expressed only in the human trachea tissue and SAa2,3-gal receptor was expressed only in the chicken trachea tissue. Results from the quantitative analysis demonstrated that both receptors were expressed in trachea tis- sues of human and mouse, as well as in lung tissues of humans, chickens and ducks. Meanwhile, our results also showed that the expression and distribution of influenza virus receptors in the same tissue were not always uniform, indicating that their distribution and expression in various tissues are not simply the distinction between the presence or absence of receptors, but rather the difference in the amount of expressed receptors.

关键词： influenza virus siaUc acid receptors trachea lung lectin immunofluorescence quantitative analysis qualitative analysis

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Effect of particle degradation on electrostatic sensor measurements and flow characteristics in dilute pneumatic conveying

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Particuology 2017年第4期15卷 73-79页

作者： Wei Chen jianyong zhang Timothy Donohua Kenneth Williams Ruixue Cheng Mark Jones Bin Zhou Centre for Bulk Solids and Particulate Technologies The University of Newcastle Callaghan 2308 Australia University of Teesside Middlesbrough Cleveland TS1 United Kingdom Southeast University Nanjing 210009 China

Vigorous particle collisions and mechanical processes occurring during high-velocity pneumatic con- veying often lead to particle degradation. The resulting particle size reduction and particle number increase will impact on the flow characteristics, and subsequently affect the electrostatic type of flow measurements. This study investigates this phenomenon using both experimental and numerical meth- ods. Particle degradation was induced experimentally by recursively conveying the fillite material within a pneumatic pipeline. The associated particle size reduction was monitored. Three electrostatic sensors were embedded along the pipeline to monitor the flow. The results indicated a decreasing trend in the electrostatic sensor outputs with decreasing particle size, which suggested the attenuation of the flow velocity fluctuation. This trend was more apparent at higher conveying velocities, which suggested that more severe particle degradation occurred under these conditions. Coupled computational fluid dynamics and discrete element methods （CFD-DEM） analysis was used to qualitatively validate these experimental results. The numerical results suggested that smaller particles exhibited lower flow velocity fluctua- tions, which was consistent with the observed experimental results. These findings provide important information for the accurate aoolication of electrostatic measurement devices in oneumatic conveyors.

关键词： Particle degradation Flow velocity fluctuation Electrostatic sensor CFD-DEM modelling Pneumatic conveying

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