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The 14th Asian Symposium on Visualization

作者： Minhua Jia Wu Zhou Xiaoshu Cai Institute of Particle and Two-phase Flow Measurement Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power EngineeringUniversity of Shanghai for Science & Technology

Based on the principle of depth from defocus,a three-dimensional positioning method based on two images with different degrees of blur was proposed for moving *** theoretical analysis,simulation work and experimental study of the 3 D movement measurement for micrometer-sized particles are carried out,respectively.A system was established for measuring experiments of three-dimensional particle movement,using single lens and dual *** distance between the lens and one of the cameras was adjusted by increasing the spacers of different *** the same object distance,two images with different degree of blur were *** image was transformed into gradient image by the adaptive edge detection algorithm based on gradient *** on the theory of moment invariants,the bright area of the image edge compared to the whole image is calculated,and the ratio of the two defocus radius α is *** to the formula of the object distance u,the depth position of the particle can be realized without *** order to verify the feasibility of the system,the simulation studies were conducted based on the calibrated parameters of the system,and images of the standard dots of 45μm to 2000μm were captured and processed for *** results show that during simulation,the error is less than 2% in 15 times depth of field of the imaging system,and the error in experiments is less than 8% in 12 times of depth of *** the results show that the size of particles has little effect on the accuracy of the method.

关键词： 3D movement defocused image moment-invariants degree of blur

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Black TiO_(2) for solar hydrogen conversion

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Journal of Materiomics 2017年第2期3卷 96-111页

作者： Bin Wang Shaohua Shen Samuel S.Mao School of Science MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed MatterState Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'an710049China International Research Centre for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityShaanxi710049China Xi'an Jiaotong University Suzhou Academy SuzhouJiangsu215123China Department of Mechanical Engineering University of California at BerkeleyBerkeleyCA94720United States Samuel Mao Institute of New Energy Science Hall1003 Shangbu RoadShenzhen518031China

Titanium dioxide(TiO_(2))has been widely investigated for photocatalytic H_(2) evolution and photoelectrochemical(PEC)water splitting since ***,its wide bandgap(3.0-3.2 eV)limits the optical absorption of TiO_(2) for sufficient utilization of solar *** TiO_(2) has been proposed as an effective strategy to enhance its solar absorption and thus the photocatalytic and PEC activities,and aroused widespread research *** this article,we reviewed the recent progress of black TiO_(2) for photocatalytic H_(2) evolution and PEC water splitting,along with detailed introduction to its unique structural features,optical property,charge carrier transfer property and related theoretical *** summarized in this review article,black TiO_(2) could be a promising candidate for photoelectrocatalytic hydrogen generation via water splitting,and continuous efforts are deserved for improving its solar hydrogen efficiency.

关键词： Black TiO_(2) Photoelectrochemical water splitting Photocatalytic Hydrogen evolution

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Product-based Carbon Constraint Energy Planning with pinch analysis for sustainable methanol industry in China

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Chemical engineering Transactions 2017年 61卷 103-108页

作者： Qin, Zhen Tang, Kai Wu, Xiaomei Yu, Yunsong Zhang, Zaoxiao School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

For the purpose of greenhouse gas control in chemical industries, the industrial structure adjustment and lowcarbon technology retrofit are the alternatives for policymakers and plants to simultaneously meet the energy demand and carbon emission limit. Considering the various technological sources and predictable product demand in methanol production industries, this paper presents the method of Product-based Carbon Constraint Energy Planning (PCEP) combined with improved GM(1,1) model to analyse the practical interaction between energy demand and carbon emission for methanol industry in 2020 in China. The results show that without any emission reduction measures, the total carbon emissions of methanol industry in 2020 would be 4.84 times larger than that of 2011. By enhancing the methanol production of biomass routing and conducting the project of CO2 capture and storage (CCS) in all coal-to-methanol plants, the total carbon emissions would be 36.01 % less than the given carbon constraint. Besides, at least 65 % of coal-to-methanol plants should be retrofitted with CCS on the consideration of the current challenges of biofuel development in order to meet the carbon constraint. The energy structure of China and the inherent property with high carbon content in coal determine that the coal-to-methanol routing contributes the most of methanol supply but also the maximum carbon emissions in the methanol industry, even if policymakers and plants take measures to adjust the industrial structure and retrofit the existing plants with low-carbon technology. Copyright © 2017, AIDIC Servizi S.r.l.

关键词： Chemical industry

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A depth estimation algorithm of plenoptic camera for the measurement of particles

A depth estimation algorithm of plenoptic camera for the mea...

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IEEE International Workshop on Imaging Systems and Techniques (IST)

作者： Yuanchi Ma Wu Zhou Tianlei Qian Xiaoshu Cai Institute of Particle and Two-phase Flow Measurement / Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and Technology shanghai China

Plenoptic camera has been widely studied in many areas such as circuit analysis, microbiological detection and remote sensing. But the application of plenoptic camera was rarely get attention in three-dimensional measuring for particles and fluid. The applicability and accuracy of existing algorithm for depth estimation and three-dimensional measuring is acceptable [8]. However, the traditional algorithm for depth estimation is not suitable for measuring of particles and fluid in the result of some differences between particles and other kinds of objects in three-dimensional measuring with plenoptic cameras especially in the case of low density of particles system. This paper presents an improved depth estimation algorithm of plenoptic camera for the measurement of particles. This improved algorithm can effectively restrain miscalculation of depth by pretreatment and searching for the area of maximum gradient. The improvement of accuracy and precision of this depth estimation algorithm compared with the traditional algorithm was proved by a series of experiments.

关键词： Cameras Particle measurements Atmospheric measurements Estimation Lenses Calibration Area measurement

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Layered sphere-shaped TiO_2 capped with gold nanoparticles on structural defects and their catalysis of formaldehyde oxidation

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Journal of Environmental Sciences 2016年第1期28卷 77-85页

作者： Chunyan Ma Guanglong Pang Guangzhi He Yang Li Chi He Zhengping Hao Department of Environmental Nano-materials Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Department of Environmental Science and Engineering State Key Laboratory of Multiphase Flow in Power EngineeringSchool of Energy and Power Engineering Xi'an Jiaotong University

We describe here a one-step method for the synthesis of Au/TiO2 nanosphere materials,which were formed by layered deposition of multiple anatase TiO2 *** Au nanoparticles were stabilized by structural defects in each TiO2 nanosheet,including crystal steps and edges,thereby fixing the Au-TiO2 perimeter *** transfer occurred along the gaps between these TiO2 nanosheet layers and in contact with catalytically active sites at the Au-TiO2 *** doped Au induced the formation of oxygen vacancies in the Au-TiO2 *** vacancies are essential for generating active oxygen species（-＊O^-） on the TiO2 surface and Ti^3＋ ions in bulk *** ions can then form Ti^3＋-O^--Ti^4＋species,which are known to enhance the catalytic activity of formaldehyde（HCHO） *** studies on structural and oxygen vacancy defects in Au/TiO2 samples provide a theoretical foundation for the catalytic mechanism of HCHO oxidation on oxide-supported Au materials.

关键词： Layered Au/TiO2 nanospheres Structural defects Oxygen vacancy defects Reaction mechanism Formaldehyde oxidation

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[email protected] 2 O 4 fiber-in-tube mesoporous nanostructure: Formation mechanism and high electrochemical performance as an anode for lithium-ion batteries

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Journal of Alloys and Compounds 2017年 693卷 110-117页

作者： Jianan Wang Guorui Yang Ling Wang Wei Yan Wei Wei Department of Environmental Science and Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Department of Applied Chemistry School of Science Xi'an Jiaotong University 710049 China

In this paper, [email protected] 2 O 4 with a fiber-in-tube mesoporous nanostructure has been fabricated via a one-step single-spinneret electrospinning technique. This unique nanostructure is made of an outer spinel CoFe 2 O 4 tube and a loose inner fiber composed of the residual carbonaceous materials and metal precursors. The nanostructure's properties, such as morphology, components, structures and thermal stability, are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-Ray diffraction (XRD), thermogravimetric analysis (TGA), Brunauer, Emmett and Teller type specific area (S BET ) determination, X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma-atomic emission spectrometry (ICP-AES). As an anode material for lithium-ion batteries, the [email protected] 2 O 4 composite (6.25 wt% carbon content) exhibits a high reversible capacity of 740 mA h g −1 after over 200 cycles at the current density of 200 mA g −1 with excellent cycling stability, which is attributed to its one dimensional continuous fiber-in-tube mesoporous morphology, as well as its stable structure benefiting from the existence of carbonaceous yolk. In addition, pure CoFe 2 O 4 nanotubes can also be obtained by sequentially agitating this product in water, which provides more potential applications of CoFe 2 O 4 .

关键词： Electrospinning [email protected] 2 O 4 Fiber-in-tube Mesoporous nanostructure Li-ion batteries

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Characterization of soot based on variable laser-induced spectroscopy

Characterization of soot based on variable laser-induced spe...

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Digital Holography and Three-Dimensional Imaging, DH 2016

作者： Chen, Jun Zhang, Yanfeng Yan, Huinan Su, Mingxu School of Energy and Power Engineering Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering China

The soot raise great environmental and health problems. Conventional methods don ' t have such low measurement limits. So in this paper soot's component and size information will be studied in theory and exper... 详细信息

ISBN: (纸本)9781943580156

关键词： Soot

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Adsorption Characteristics of Sulfuric Acid Mist on Fly Ash in Low-low temperature Flue Gas System

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Energy Procedia 2017年 142卷 3307-3312页

作者： Yubo Zhang Yu Yan Jianhua Liu Qingwen Qi Lei Deng Defu Che Xi’an Thermal Power Research Institute Co. Ltd. Xi’an 710032 China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an 710049 China Ningxia Electric Power Research Institute Ningxia 750002 China

Low-low temperature flue gas system which also called MHI high efficiency system developed by Mitsubishi Corporation has gained comprehensive attention in Japan, European countries and American. However, the applications of this system in China are facing several sever problems about corrosion and ash fouling. This paper focuses on the adsorption characteristics of sulfuric acid mist on fly ash during the flue gas cooling process in the exchanger before the electrostatic precipitator. The experimental results indicate that there is an optimum adsorption temperature for the adsorption of sulfuric acid mist, and this temperature is about 30 ℃ lower than the acid dew point. The process of adsorption is mainly dominated by chemical reactions rather than physical reactions, and the alkali metals (Na, K) and alkaline earth metals (Mg, Ca) are the main factors which influence the chemical reaction rate, especially the Na element. Besides, with the D/S increasing, the adsorption efficiency increases and it is independent of the adsorption temperature. Ash particle size also has large influence on the adsorption efficiency, the smaller the particle size is, the larger the adsorption efficiency is. And when the flue gas speed rose, gas residence time correspondingly reduced and the adsorption efficiency dropped. However, since gas residence time is short in engineering applications, the influence of gas residence time is quite moderate. Furthermore, the adsorption of the sulfuric acid mist will cause a significant agglomeration between ash particles, and it has great significance to the removal of PM.

关键词： Low-low temperature flue gas system sulfuric acid mist adsorption characteristics

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An LP-DOAS instrument with a laser driven light source for open-path measurement of atmospheric NO2 in Shanghai

An LP-DOAS instrument with a laser driven light source for o...

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Progress in Electromagnetic Research Symposium (PIERS)

作者： Mingzhi Li Jun Chen Mingxu Su Huinan Yang Arun Ramachandran Ravi Varma Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and Technology Shanghai China Department of Physics National Institute of Technology Calicut Calicut Kerala India

Shanghai is currently faced with the complex atmospheric pollution problem such as ozone (O 3 ) and PM2.5. O 3 is responsible for oxidization of atmospheric constituents that in turn produces secondary pollutants. Reducing atmospheric oxidation is the underpinning strategy for the prevention and control of pollution in this city. According to the observation data from the online automatic monitoring station of Shanghai, the city's O 3 concentration has been rising steadily. In 2013, there are 100 days with ozone as the main pollutants, accounted for 31.9%. By Leighton relationship (K 6 [O 3 ][NO]=K 4 [NO 2 ] = 1), concentration of O 3 is closely related to that of NO 2 . So, continuous monitoring of atmospheric NO 2 has important significance. An instrument was developed for measuring atmospheric NO 2 concentration using a powerful light source in conjunction with the long-path differential optical absorption spectroscopy (LP-DOAS) technique. This system installed at the central section of Shanghai used a laser driven light source (LDLS) and a sensitive TE cooled spectrometer. The LDLS showed better stability, high optical efficiency when compared to traditional arc lamp and light emitting diodes. The light sent into the atmosphere was returned by a retro reflecting mirror placed 1.3km away, and the light returned was sent to a high sensitive TE cooled spectrometer. The spectral range of measurement was 415-455nm and the spectra collected were averaged over 10 min, prior to analyzing for NO 2 concentration. Continuous observations were carried out for two weeks and the NO 2 concentration retrieved ranged from (20-600) ug/m3 with an estimated detection limit of 6.77 ug/m3. The measurement results indicate that it is feasible to use this instrument for detecting the NO 2 with high spatial and temporal sensitivity.

关键词： Absorption Atmospheric measurements Light sources Pollution measurement Optical sensors Wavelength measurement Instruments

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Assessing the predictions of A NOx kinetic mechanism on recent hydrogen and syngas experimental data 9

Assessing the predictions of A NOx kinetic mechanism on rece...

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9th International Conference on Modeling and Diagnostics for Advanved Engine Systems, COMODIA 2017

作者： Zhang, Yingjia Mathieu, Olivier Petersen, Eric Bourque, Gilles Li, Qianqian Curran, Henry Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Combustion Chemistry Centre National University of Ireland Galway Ireland Department of Mechanical Engineering Texas A and M University College StationTX United States Siemens Canada Limited 9545 Cote de Liesse Road MontrealQCH9P 1A5 Canada

A detailed chemical kinetic mechanism has been developed to describe the pyrolysis and oxidation of the hydrogen/NOx and syngas/NOx systems. The thermodynamic data of nitrogenous compounds have been updated based on t... 详细信息

关键词： Hydrogen

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