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arXiv 2020年

作者： Zhao, K. Vowinckel, Bernhard Hsu, T.-J. Köllner, T. Bai, B. Meiburg, E. Department of Mechanical Engineering UC Santa Barbara CA93106 United States State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China Leichtweiß-Institut für Wasserbau Technische Universität Braunschweig Braunschweig38106 Germany Center for Applied Coastal Research Department of Civil & Environmental Engineering University of Delaware NewarkDE19716 United States

We propose a one-way coupled model that tracks individual primary particles in a conceptually simple cellular flow setup to predict flocculation in turbulence. This computationally efficient model accounts for Stokes drag, lubrication, cohesive and direct contact forces on the primary spherical particles, and allows for a systematic simulation campaign that yields the transient mean floc size as a function of the governing dimensionless parameters. The simulations reproduce the growth of the cohesive flocs with time, and the emergence of a log-normal equilibrium distribution governed by the balance of aggregation and breakage. Flocculation proceeds most rapidly when the Stokes number of the primary particles is O(1). Results from this simple computational model are consistent with experimental observations, thus allowing us to propose a new analytical flocculation model that yields improved agreement with experimental data, especially during the transient stages. Copyright © 2020, The Authors. All rights reserved.

关键词： Turbulence

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Applications of Raman Spectroscopy in Clinical Medicine

arXiv

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arXiv 2023年

作者： Qi, Yaping Chen, Esther Xinyi Hu, Dan Yang, Ying Wu, Zhenping Zheng, Ming Sadi, Mohammad A. Jiang, Yucheng Zhang, Kang Chen, Zi Chen, Yong P. Department of Engineering Science Faculty of Innovation Engineering Macau University of Science and Technology Av. Wai Long China Tohoku University Sendai980-8577 Japan Faculty of Medicine Macau University of Science and Technology Av. Wai Long China State Key Laboratory of Information Photonics and Optical Communications School of Science Beijing University of Posts and Telecommunications Beijing100876 China School of Materials Science and Physics China University of Mining and Technology Xuzhou221116 China Department of Physics and Astronomy Elmore Family School of Electrical and Computer Engineering Birck Nanotechnology Center Purdue Quantum Science and Engineering Institute Purdue University West LafayetteIN47907 United States Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and Technology Suzhou University of Science and Technology Jiangsu Suzhou215009 China Division of Thoracic Surgery Brigham and Women's Hospital Harvard Medical School 75 Francis Street BostonMA02115 United States Institute of Physics and Astronomy Villum Center for Hybrid Quantum Materials and Devices Aarhus University AarhusC 8000 Denmark

Raman spectroscopy provides spectral information related to the specific molecular structures of substances and has been well established as a powerful tool for studying biological tissues and diagnosing diseases. This article reviews recent advances in Raman spectroscopy and its applications in diagnosing various critical diseases, including cancers, infections, and neurodegenerative diseases, and in predicting surgical outcomes. These advances are explored through discussion of state-of-the-art forms of Raman spectroscopy, such as surface-enhanced Raman spectroscopy, resonance Raman spectroscopy, and tip-enhanced Raman spectroscopy employed in biomedical sciences. We discuss biomedical applications, including various aspects and methods of ex vivo and in vivo medical diagnosis, sample collection, data processing, and achievements in realizing the correlation between Raman spectra and biochemical information in certain diseases. Finally, we present the limitations of the current study and provide perspectives for future research. © 2023, CC BY.

关键词： COVID-19

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Carbon foams prepared from coal tar pitch for building thermal insulation material with low cost

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Chinese Journal of Chemical engineering 2018年第2期26卷 415-420页

作者： Xiang Liu Yanli Wang Liang Zhan State Key Laboratory of Chemical Engineering East China University of Science and Technology Key Laboratory for Specially Functional Polymers and Related Technology of Ministry of Education East China University of Science and Technology Shanghai Key Laboratory of Multiphase Materials Chemical Engineering East China University of Science and Technology CAS Key Laboratory of Carbon Materials Institute of Coal Chemistry Chinese Academy of Sciences

A new approach is provided to resolve the large-scale applications of coal tar pitch. Carbon foams with uniform pore size are prepared at the foaming pressure of normal pressure using coal tar pitch as raw materials. The physical and chemical performance of high softening point pitch(HSPP) can be regulated by vacuumizing owing to the cooperation of vacuumizing and polycondensation. Results indicate that the optimum softening point and weight ratio of quinoline insoluble are about 292℃ and 65.7%, respectively. And the optimum viscosity of HSPP during the foaming process is distributed in the range of 1000-10000 Pa·s. The resultant carbon foam exhibits excellent performance, such as uniform pore structure, high compressive strength(4.7 MPa), low thermal conductivity(0.07 W·m^(-1) ·K^(-1)), specially, it cannot be fired under the high temperature of 1200 ℃.Thus, this kind of carbon foam is a potential candidate for thermal insulation material applied in energy saving building.

关键词： Carbon foam Coal tar pitch Building thermal insulation materials

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Processing and Properties of Flexible Hot Gas Sealing Materials for Ceramic Membrane

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China's Refractories 2018年第4期27卷 31-40页

作者： SUN Guangchao LIU Kaiqi LIU Qingzhu SI Kaikai State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of Sciences

Ceramic membranes are effective to reduce PM2.5 emission when used for hot flue gas *** properties of the sealing material play a decisive role infiltration ***,there are few studies on sealing materials for hot flue gas filtration above 700 ℃.This investigation was performed to develop flexible sealing materials which can be used for a long time at high *** order to obtain sufficient mechanical strength and continuous flexibility,three kinds of binders were selected as coating *** sealing materials based on high silica fiber fabric and aluminum silicate fiber fabric were successfully *** effect of aging on mechanical properties and microstructural characteristics of the composites subjected to coating had been investigated by XRD,SEM and *** results show that waterborne polyurethane (WPU) is a suitable coating binder for the sealing materials,which can be used for a long time at 1 000 ℃ and 700 ℃,respectively,without significant decrease in ***,the other two binders,aluminum dihydrogen phosphate and aluminum chromium phosphate will weaken the flexibility,resulting in frangibility and reducing sealing *** developed composites possess required thermo-stability and desired mechanical strength as flexible sealing materials,indicating their strong application possibility in hot flue gas filtration.

关键词： hot flue gas sealing materials binder ceramic membrane filtration

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Cover Image, Volume 4, Number 1, January 2022

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Carbon Energy 2022年第1期4卷

作者： Chengyong Shu Qiang Tan Chengwei Deng Wei Du Zhuofan Gan Yan Liu Chao Fan Hui Jin Wei Tang Xiao-dong Yang Xiaohua Yang Yuping Wu School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an China State Key Laboratory for Mechanical Behavior of Materials School of Material Science and Engineering Xi'an Jiaotong University Xi'an China State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power Sources Shanghai China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China Xiao-dong Yang College of Materials Science and Engineering Huaqiao University 361021 Xiamen China. Xiaohua Yang Institute of Quantum and Sustainable Technology (IQST) School of Chemistry and Chemical Engineering Jiangsu University 212013 Zhenjiang China. Yuping Wu State Key Laboratory of Materials-Oriented Chemical Engineering School of Energy Science and Engineering and Institute of Advanced Materials Nanjing Tech University 211800 Nanjing China. College of Materials Science and Engineering Huaqiao University Xiamen China Institute of Quantum and Sustainable Technology (IQST) School of Chemistry and Chemical Engineering Jiangsu University Zhenjiang China State Key Laboratory of Materials-Oriented Chemical Engineering School of Energy Science and Engineering and Institute of Advanced Materials Nanjing Tech University Nanjing China

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Study on Combustion Characteristics of Coals in High Temperature Water Vapor Atmospheres

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Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 2018年第12期52卷 84-92页

作者： Yao, Yashu Wen, Du Zhou, Qulan Li, Na State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

A scheme of adding high temperature water vapor to the combustion system to achieve low-nitrogen combustion is proposed to reduce NOx production during coal combustion, and its thermodynamic calculation and experimental research are carried out. Firstly, the possibility and limitation of the reactions in the volatile combustion process of coal after adding high temperature water vapor are examined by theoretical calculation based on the standard molar reaction Gibbs free energy change, the standard molar enthalpy and the equilibrium constant. Results of reaction path speculation show that in the high temperature water vapor atmosphere, the reactions of converting N element to N2 occur in the temperature range of coal combustion. Secondly, in reactions with various excess air coefficients, the equilibrium components after adding different concentrations of high temperature water vapor are calculated using the software HSC Chemistry. Results of the thermodynamic calculation show that the reaction of NOx precursor to N2 happens in a wide temperature range: when the temperature ranges from 700 to 800 and excess air coefficient lies between 0.6 and 0.8, the formation of NOx significantly reduces by adding high temperature water vapor;Reduction rate of NOx increases with the concentration of high temperature water vapor increasing. Eventually, the combustion characteristics of pulverized coal in water vapor and air atmosphere are tested in a pulverized coal fixed bed combustion experiment system. It shows that the formation of NOx is inhibited by adding high temperature water vapor and the effect is better that the result of the thermodynamic calculation, and the NOx reduction rate has a nonlinear relation with the water vapor concentration and the temperature. This study may provide an economical and efficient reference solution to low NOx combustion of coal. © 2018, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.

关键词： Coal combustion

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Mass Transfer and Kinetics of CO2 Absorption in Aqueous MDEA/DMSO Solutions

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2018年第8期39卷 1763-1768页

作者： Luo, Qin-Lan Fang, Bin Qiang, Lei Li, Na Zhou, Qu-Lan State key laboratory of multiphase flow in power engineering Xi'an Jiaotong University Xi'an710049 China

In this study, the CO2 absorption rates in aqueous MDEA/DMSO solutions at various temperatures of 293.15 K, 303.15 K, 313.15 K and 323.15 K and concentrations varied from 0.5 mol/L to 6.6 mol/K were measured by using a laboratory wetted-wall column reactor with an immobile gas-liquid interface. A simplified kinetic model of gas-liquid absorption was developed, the mass transfer and dynamic parameters, such as the absorption rate constant, the overall reaction rate constant, the second-order reaction rate constant and the enhancement factor, were evaluated. The relationship between second-order reaction rate constant and the reaction temperature was obtained, the effect of solution concentration on the enhancement factor was also assessed, and the activation energy was estimated at a value of 20.38 kJ/mol. © 2018, Science Press. All right reserved.

关键词： Kinetics

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Confining Phosphoric Acid in Quaternized COF Channels for Ultra-Stable and Fast Anhydrous Proton Transport

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Angewandte Chemie 2025年

作者： Xiao Pang Benbing Shi Prof. Dr. Yawei Liu Prof. Dr. Hong Wu Jianliang Shen Jingyuan Guan Xiaoyao Wang Chunyang Fan Li Cao Tianhao Zhu Yan Kong Prof. Dr. Zhongyi Jiang Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China (Z. Jiang Ningbo Key Laboratory of Green Petrochemical Carbon Emission Reduction Technology and Equipment Zhejiang Institute of Tianjin University Ningbo Zhejiang 315201 China Chinese Acad Sci Beijing Key Lab Ion Liquids Clean Proc CAS Key Lab Green Proc & Engn State Key Lab Multiphase Complex Syst Inst Proc En Beijing 100190 Peoples R China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New City Fuzhou 350207 China Haihe Laboratory of Sustainable Chemical Transformations 300192 Tianjin China

Phosphoric acid (H 3 PO 4 ) doping is a widely employed strategy to facilitate anhydrous proton transport in high-temperature proton exchange membrane fuel cells (HT-PEMFCs). However, significant H 3 PO 4 leaching during long-term operation poses critical challenges to maintaining membrane stability and proton conductivity. Herein, H 3 PO 4 is incorporated into positively charged nanochannels of quaternized covalent organic framework membranes (QACOFMs), leveraging strong electrostatic interactions and confinement effects to achieve exceptional H 3 PO 4 retention under hydration conditions. Moreover, the shortened hydrogen bond length between H 3 PO 4 (O−H…O <2.7 Å) and the highly interconnected hydrogen bond network in the H 3 PO 4 @QACOFMs facilitate ultra-fast anhydrous proton transport. As a result, the H 3 PO 4 @QACOFMs exhibit superior anhydrous proton transport in a broader temperature range (60 °C–200 °C) and the highest proton conductivity reaches about 379.7 mS cm −1 at 200 °C.

关键词： Quaternized covalent framework membrane Phosphoric acid High temperature proton exchange membrane fuel cells Anhydrous Proton conductivity

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Designing Core-Shell Structured Composite Powders for Making High-Performance Titanium Matrix Composites

Designing Core-Shell Structured Composite Powders for Making...

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作者： Yafeng Yang Shaofu Li State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of Sciences

Titanium metal matrix composites (TMCs) possess a good balanced mechanical properties and therefore have a big potential of being widely applied in the aerospace *** particle and carbon nanotubes (CNTs)are always selected as the reinforcements due to their high hardness,good wear resistance,excellent creep resistance and high temperature mechanical properties.

关键词： Shell Designing Core-Shell Structured Composite Powders for Making High-Performance Titanium Matrix Composites Matrix

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Molecular sieving through a graphene nanopore： non-equilibrium molecular dynamics simulation

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Science Bulletin 2017年第8期62卷 554-562页

作者： Chengzhen Sun Bofeng Bai State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Two-dimensional graphene nanopores have shown great promise as ultra-permeable molecular sieves based on their size-sieving effects. We design a nitrogen/hydrogen modified graphene nanopore and conduct a transient non-equilibrium molecular dynamics simulation on its molecular sieving effects. The distinct time-varying molecular crossing numbers show that this special nanopore can efficiently sieve CO_2 and H_2S molecules from CH_4 molecules with high selectivity. By analyzing the molecular structure and pore functionalization-related molecular orientation and permeable zone in the nanopore, density distribution in the molecular adsorption layer on the graphene surface, as well as other features, the molecular sieving mechanisms of graphene nanopores are revealed. Finally, several implications on the design of highly-efficient graphene nanopores, especially for determining the porosity and chemical functionalization, as gas separation membranes are summarized based on the identified phenomena and mechanisms.

关键词： Graphene nanopore Molecular sieve Molecular dynamics Gas separation membrane

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