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Harvesting waste heat energy by promoting H+-ion concentration difference with a fuel cell structure EI SCIE
期刊论文 | 2019 , 57 , 101-107 | Nano Energy
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Abstract :

Energy consumption continues to rise as society develops worldwide. Meanwhile, a lot of energy is wasted in the form of heat from various devices and systems. Here we report a new power generator, which works based on a difference in H+-ion concentration in a fuel cell structure and produces electricity by harvesting waste heat. The device works via the following three successive processes: H2 is oxidized at anode to H+ ions, the H+ ions then penetrate through a phosphoric acid-treated polybenzimidazole (PBI-PA) membrane and finally the H+ ions get reduced to H2 at cathode with electrons coming through external circuit from the anode. This system generates electricity at a current density of 21 mA cm−2 and a power density of 1.03 mW cm−2 at 170 °C. The cell's thermoelectric conversion efficiency at 170 °C is 13.72%, which is higher than typical values reported for many common thermoelectric materials in low temperature regimes. This innovative approach may allow for efficient generation of electricity from waste heat. © 2018 Elsevier Ltd

Keyword :

Electrical energy Innovative approaches Ion concentrations Low-temperature regime Renewable energies Thermal conversion Thermo-Electric materials Thermoelectric conversion efficiency

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GB/T 7714 Liu, Yan , Chen, Yuanzhen , Ming, Jun et al. Harvesting waste heat energy by promoting H+-ion concentration difference with a fuel cell structure [J]. | Nano Energy , 2019 , 57 : 101-107 .
MLA Liu, Yan et al. "Harvesting waste heat energy by promoting H+-ion concentration difference with a fuel cell structure" . | Nano Energy 57 (2019) : 101-107 .
APA Liu, Yan , Chen, Yuanzhen , Ming, Jun , Chen, Li , Shu, Chengyong , Qu, Ting et al. Harvesting waste heat energy by promoting H+-ion concentration difference with a fuel cell structure . | Nano Energy , 2019 , 57 , 101-107 .
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Nanoscale simulation of local gas transport in catalyst layers of proton exchange membrane fuel cells EI Scopus SCIE
期刊论文 | 2018 , 400 , 114-125 | Journal of Power Sources
WoS CC Cited Count: 5 SCOPUS Cited Count: 9
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Abstract :

Reducing Platinum amount in proton exchange membrane fuel cell (PEMFC) is one of the main tasks to achieve low cost PEMFC. Recently, significant performance loss has been found under low Pt loading due to local mass transport limitations. In this study, pore-scale simulations are conducted to study oxygen transport within four-constituent microscopic structures of catalyst layer including a carbon particle, ionomer, Pt particles, and primary pores inside the carbon particle. Multiphase physicochemical processes are considered, including oxygen dissolution at the pore/ionomer interface, oxygen diffusion within the ionomer film and inside the primary pores, and reactions at the Pt interface. Local transport resistance is calculated based on the pore-scale concentration field predicted. The simulation results are compared with existing experimental results and 1D models. Simulation results show that dissolution resistance at the secondary pore/ionomer interface is about 10–50 times higher than that inside the ionomoer. Local transport resistance increases as Pt loading decreases, especially under Pt loading of 0.1 mg cm−2. Besides, local transport resistance can be reduced by depositing more Pt outside the carbon particle, alleviating agglomeration and/or decreasing the ionomer thickness. The simulation results indicate that local transport characteristics should be considered when developing 1D agglomeration model of catalyst layer. © 2018 Elsevier B.V.

Keyword :

Catalyst layers Lattice Boltzmann method Local transport Mass transport limitation Microscopic structures Nano-scale simulations Physicochemical process Pore-scale simulation

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GB/T 7714 Chen, Li , Zhang, Ruiyuan , He, Pu et al. Nanoscale simulation of local gas transport in catalyst layers of proton exchange membrane fuel cells [J]. | Journal of Power Sources , 2018 , 400 : 114-125 .
MLA Chen, Li et al. "Nanoscale simulation of local gas transport in catalyst layers of proton exchange membrane fuel cells" . | Journal of Power Sources 400 (2018) : 114-125 .
APA Chen, Li , Zhang, Ruiyuan , He, Pu , Kang, Qinjun , He, Ya-Ling , Tao, Wen-Quan . Nanoscale simulation of local gas transport in catalyst layers of proton exchange membrane fuel cells . | Journal of Power Sources , 2018 , 400 , 114-125 .
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EVALUATION OF THE PERFORMANCE OF CAVITIES IN NUCLEATE BOILING AT MICROSCALE LEVEL CPCI-S SCIE
会议论文 | 2018 , 49 (11) , 1003-1022 | 3rd International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control (IWHT)
WoS CC Cited Count: 1
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Abstract :

Nucleate boiling heat transfer (NBHT) from enhanced structures is an effective way to dissipate a high heat flux. In the present study, the behavior of cavities with nucleation on roughened surfaces is studied numerically during the entire ebullition cycle based on the phase-change lattice Boltzmann method. The adopted model is firstly validated by the Laplace law and the two-phase coexistence curve and then is applied to investigate the effects of the cavity structure on NBHT. The bubble departure diameter, departure frequency, and the total boiling heat flux of the ebullition cycle are also studied. It is shown that the cavity widths and the cavity grooves exhibit a significant influence on the NBHT features. A cavity with a circular groove in the present research shows the best performance for NBHT in terms of the averaged heat flux and bubble release frequency. When a specific cavity is combined with other different cavities on roughened surfaces, its nucleation process on different roughened surfaces may differ greatly.

Keyword :

lattice Boltzmann method bubble dynamics cavity groove nucleate boiling

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GB/T 7714 Mu, Yu-Tong , Chen, Li , Kang, Qin-Jun et al. EVALUATION OF THE PERFORMANCE OF CAVITIES IN NUCLEATE BOILING AT MICROSCALE LEVEL [C] . 2018 : 1003-1022 .
MLA Mu, Yu-Tong et al. "EVALUATION OF THE PERFORMANCE OF CAVITIES IN NUCLEATE BOILING AT MICROSCALE LEVEL" . (2018) : 1003-1022 .
APA Mu, Yu-Tong , Chen, Li , Kang, Qin-Jun , Tao, Wen-Quan . EVALUATION OF THE PERFORMANCE OF CAVITIES IN NUCLEATE BOILING AT MICROSCALE LEVEL . (2018) : 1003-1022 .
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Influences of the perforation on effective transport properties of gas diffusion layers EI SCIE Scopus
期刊论文 | 2018 , 126 , 243-255 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
WoS CC Cited Count: 7 SCOPUS Cited Count: 6
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Abstract :

In this paper, the through-plane and in-plane effective transport properties, including permeability, diffusivity and thermal conductivity, of the perforated gas diffusion layer (GDL) are predicted using multiple-relaxation-time (MRT) lattice Boltzmann method (LBM) based on stochastic reconstructed microstructures. When predicting effective thermal conductivities of GDL, the effect of anisotropic conductive property of fibers is considered. The effective transport properties of dry perforated GDL are fitted as a function of perforation diameter and porosity. It is found that the permeability and effective diffusivity of GDL increase with perforation diameter and porosity while the effective thermal conductivity decreases. The two-phase LBM is adopted to simulate water distributions in perforated GDLs, and dependences of effective transport properties on saturation are then obtained. The results show that: the existence of the perforation significantly affects the water transport in hydrophobic perforated GDLs if its diameter is larger than the average pore size of GDL. The effective permeability and diffusivity of GDL decrease while effective thermal conductivity increases with saturation. The effective transport properties of perforated GDLs change less significantly with saturation than those of non-perforated GDL if the water droplet intruding into the perforation is displaced, while change more rapidly with saturation if the water droplet remains inside the perforation. (C) 2018 Published by Elsevier Ltd.

Keyword :

Multiple-relaxation-time Lattice Boltzmann method Saturation Gas diffusion layer Effective transport property Perforation

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GB/T 7714 Fang, Wen-Zhen , Tang, Yu-Qing , Chen, Li et al. Influences of the perforation on effective transport properties of gas diffusion layers [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2018 , 126 : 243-255 .
MLA Fang, Wen-Zhen et al. "Influences of the perforation on effective transport properties of gas diffusion layers" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 126 (2018) : 243-255 .
APA Fang, Wen-Zhen , Tang, Yu-Qing , Chen, Li , Kang, Qin-Jun , Tao, Wen-Quan . Influences of the perforation on effective transport properties of gas diffusion layers . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2018 , 126 , 243-255 .
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A multi-block lattice Boltzmann method for the thermal contact resistance at the interface of two solids EI SCIE Scopus
期刊论文 | 2018 , 138 , 122-132 | APPLIED THERMAL ENGINEERING
WoS CC Cited Count: 4 SCOPUS Cited Count: 2
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Abstract :

In the present paper, a patching type multi-block lattice Boltzmann method is adopted to predict the thermal contact resistance (TCR) at the interface of two solids. The rough surfaces of contact materials are reconstructed based on the fractal theory and the contact pressure is obtained based on the plastic deformation model. The accuracy of the patching type multi-block lattice Boltzmann method is validated by some benchmarks. After validations, effects of the contact pressure, roughness, thermal conductivity of contact material, thermal conductivity of interstitial medium, temperature and radiation on TCR are investigated. The results show that: the TCR decreases when the contact pressure increases, but increases with the root-mean-square roughness; the TCR of two contact aluminums decreases faster than that of stainless steels when contact pressure increases; a higher thermal conductivity of contact materials leads to a smaller TCR; when the thermal conductivity of interstitial medium is close to zero or the gap is in vacuum, the TCR is much larger than that filled with air, especially at low contact pressure; at the high temperature, the contribution of the radiation to the TCR becomes appreciable if the thermal conductivity of the interstitial medium is low. Especially when the gap is in vacuum, the contribution of radiation on the TCR cannot be neglected.

Keyword :

Multi-block Lattice Boltzmann method Fractal Thermal contact resistance

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GB/T 7714 Fang, Wen-Zhen , Gou, Jian-Jun , Chen, Li et al. A multi-block lattice Boltzmann method for the thermal contact resistance at the interface of two solids [J]. | APPLIED THERMAL ENGINEERING , 2018 , 138 : 122-132 .
MLA Fang, Wen-Zhen et al. "A multi-block lattice Boltzmann method for the thermal contact resistance at the interface of two solids" . | APPLIED THERMAL ENGINEERING 138 (2018) : 122-132 .
APA Fang, Wen-Zhen , Gou, Jian-Jun , Chen, Li , Tao, Wen-Quan . A multi-block lattice Boltzmann method for the thermal contact resistance at the interface of two solids . | APPLIED THERMAL ENGINEERING , 2018 , 138 , 122-132 .
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Pore-scale study of effects of macroscopic pores and their distributions on reactive transport in hierarchical porous media EI SCIE Scopus
期刊论文 | 2018 , 349 , 428-437 | CHEMICAL ENGINEERING JOURNAL
WoS CC Cited Count: 10 SCOPUS Cited Count: 13
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Abstract :

For applications of reactive transport in porous media, optimal porous structures should possess both high surface area for reactive sites loading and low mass transport resistance. Hierarchical porous media with a combination of pores at different scales are designed for this purpose. Using the lattice Boltzmann method, pore-scale numerical studies are conducted to investigate diffusion-reaction processes in 2D hierarchical porous media generated by self-developed reconstruction scheme. Complex interactions between porous structures and reactive transport are revealed under different conditions. Simulation results show that adding macropores can greatly enhance the mass transport, but at the same time reduce the reactive surface, leading to complex change trend of the total reaction rate. Effects of gradient distribution of macropores within the porous medium are also investigated. It is found that a front-loose, back-tight (FLBT) hierarchical structure is desirable for enhancing mass transport, increasing total reaction rate, and improving catalyst utilization. On the whole, from the viewpoint of reducing cost and improving material performance, hierarchical porous structures, especially gradient structures with the size of macropores gradually decreasing along the transport direction, are desirable for catalyst application.

Keyword :

Catalyst utilization Gradient distribution Hierarchical porous media Lattice Boltzmann method Pore-scale

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GB/T 7714 Chen, Li , Zhang, Ruiyuan , Min, Ting et al. Pore-scale study of effects of macroscopic pores and their distributions on reactive transport in hierarchical porous media [J]. | CHEMICAL ENGINEERING JOURNAL , 2018 , 349 : 428-437 .
MLA Chen, Li et al. "Pore-scale study of effects of macroscopic pores and their distributions on reactive transport in hierarchical porous media" . | CHEMICAL ENGINEERING JOURNAL 349 (2018) : 428-437 .
APA Chen, Li , Zhang, Ruiyuan , Min, Ting , Kang, Qinjun , Tao, Wenquan . Pore-scale study of effects of macroscopic pores and their distributions on reactive transport in hierarchical porous media . | CHEMICAL ENGINEERING JOURNAL , 2018 , 349 , 428-437 .
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Pore scale study of multiphase multicomponent reactive transport during CO2 dissolution trapping EI SCIE Scopus
期刊论文 | 2018 , 116 , 208-218 | ADVANCES IN WATER RESOURCES
WoS CC Cited Count: 4 SCOPUS Cited Count: 5
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Abstract :

Solubility trapping is crucial for permanent CO 2 sequestration in deep saline aquifers. For the first time, a pore-scale numerical method is developed to investigate coupled scCO(2)-water two-phase flow, multicomponent (CO2(aq), H+, HCO3, CO32- and OH ) mass transport, heterogeneous interfacial dissolution reaction, and homogeneous dissociation reactions. Pore-scale details of evolutions of multiphase distributions and concentration fields are presented and discussed. Time evolutions of several variables including averaged CO2(aq) concentration, scCO(2) saturation, and pH value are analyzed. Specific interfacial length, an important variable which cannot be determined but is required by continuum models, is investigated in detail. Mass transport coefficient or efficient dissolution rate is also evaluated. The pore-scale results show strong non-equilibrium characteristics during solubility trapping due to non-uniform distributions of multiphase as well as slow mass transport process. Complicated coupling mechanisms between multiphase flow, mass transport and chemical reactions are also revealed. Finally, effects of wettability are also studied. The pore-scale studies provide deep understanding of non-linear non-equilibrium multiple physicochemical processes during CO2 solubility trapping processes, and also allow to quantitatively predict some important empirical relationships, such as saturation-interfacial surface area, for continuum models.

Keyword :

Porous media Lattice Boltzmann method Solubility trapping Multiphase flow Reactive transport CO2 sequestration

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GB/T 7714 Chen, Li , Wang, Mengyi , Kang, Qinjun et al. Pore scale study of multiphase multicomponent reactive transport during CO2 dissolution trapping [J]. | ADVANCES IN WATER RESOURCES , 2018 , 116 : 208-218 .
MLA Chen, Li et al. "Pore scale study of multiphase multicomponent reactive transport during CO2 dissolution trapping" . | ADVANCES IN WATER RESOURCES 116 (2018) : 208-218 .
APA Chen, Li , Wang, Mengyi , Kang, Qinjun , Tao, Wenquan . Pore scale study of multiphase multicomponent reactive transport during CO2 dissolution trapping . | ADVANCES IN WATER RESOURCES , 2018 , 116 , 208-218 .
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Study on the combustion characteristics and stabilization mechanism of low swirl CH4/H2flame EI Scopus CSCD PKU
期刊论文 | 2017 , 51 (1) , 72-78 | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University
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Abstract :

The numerical simulation on the premixed CH4/H2gas at an equivalence ratio of 0.7 was conducted to investigate the combustion characteristics and stabilization mechanism of low swirl CH4/H2flame in various hydrogen volume proportions. The analyses on the self-similar characteristics, the flow field structure and the flame characteristics of CH4/H2flame were performed, and the effect of swirl number on the flashback of hydrogen-enriched fuel was studied. The results showed that with the increase of H2volume proportion, the self-similar characteristics of CH4/H2flame still remain; the intensity of the shear layer increases gradually and the inner shear layer moves gradually to the central low-velocity zone, which compels the flame front towards the nozzle, and the shape of the flame changes from the “bowl” type to “W” type, and then converts to “V” type finally. The mean axial and radial aerodynamic stretch rates and the virtual origin are almost not affected by the hydrogen volume proportion. When the hydrogen volume proportion increases from 80% to 95%, the laminar flame speed of the fuel changes greatly, leading to drastic changes in the flow field structure and the flame front. As for the CH4/H2flame in the central low-velocity zone, when the flame propagation velocity is equal to the local gas velocity, the flame is stable; as for the CH4/H2flame in the shear layer, the vortex produced by the velocity gradient facilitates the local gas flowing downward and moving toward the central low-velocity zone, thus the flame moves upward and reaches a stable state. Decreasing the swirl number properly is beneficial to the reduction of the flashback of hydrogen-enriched fuel. © 2017, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.

Keyword :

Combustion characteristics Flame characteristics Flame propagation velocity Flow field structure Laminar flame speed Low swirl Stabilization mechanisms Swirl numbers

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GB/T 7714 Chen, Li , Li, Xiangsheng . Study on the combustion characteristics and stabilization mechanism of low swirl CH4/H2flame [J]. | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2017 , 51 (1) : 72-78 .
MLA Chen, Li et al. "Study on the combustion characteristics and stabilization mechanism of low swirl CH4/H2flame" . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 51 . 1 (2017) : 72-78 .
APA Chen, Li , Li, Xiangsheng . Study on the combustion characteristics and stabilization mechanism of low swirl CH4/H2flame . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2017 , 51 (1) , 72-78 .
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Numerical Study of the Gas Purging Process of a Proton Exchange Membrane Fuel Cell EI CPCI-S Scopus
会议论文 | 2017 , 105 , 1967-1973 | 8th International Conference on Applied Energy (ICAE)
WoS CC Cited Count: 3 SCOPUS Cited Count: 3
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Abstract :

Gas purging has been a common strategy to improve the possibility of cold start of a proton exchange membrane fuel cell (PEMFC) vehicles. In the present study, water removal in a PEMFC during gas purging after its shutdown is numerically investigated with a transient two-fluid model. The effect of purging gas flow rate on the liquid water and membrane water is explored. The results indicate that the water removal process is not sequential in the sub-regions of PEMFC and the purging gas flow rate affects the overall drying process. (C) 2017 The Authors. Published by Elsevier Ltd.

Keyword :

Liquid saturation HFR Two-fluid model PEMFC Gas purge

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GB/T 7714 Mu, Yu-Tong , He, Pu , Ding, Jing et al. Numerical Study of the Gas Purging Process of a Proton Exchange Membrane Fuel Cell [C] . 2017 : 1967-1973 .
MLA Mu, Yu-Tong et al. "Numerical Study of the Gas Purging Process of a Proton Exchange Membrane Fuel Cell" . (2017) : 1967-1973 .
APA Mu, Yu-Tong , He, Pu , Ding, Jing , Chen, Li , Tao, Wen-Quan . Numerical Study of the Gas Purging Process of a Proton Exchange Membrane Fuel Cell . (2017) : 1967-1973 .
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Pore-scale lattice Boltzmann simulation of micro-gaseous flow considering surface diffusion effect EI SCIE Scopus
期刊论文 | 2017 , 169 , 62-73 | INTERNATIONAL JOURNAL OF COAL GEOLOGY | IF: 4.13
WoS CC Cited Count: 24 SCOPUS Cited Count: 25
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Abstract :

Recent studies have shown that adsorbed gas and its surface diffusion have profound influence on micro gaseous flow through organic pores in shale gas reservoirs. In this paper, a multiple-relaxation-time (MRT) LB model is adopted to estimate the apparent permeability of organic shale and a new boundary condition, which combines Langmuir adsorption theory with Maxwellian diffusive reflection boundary condition, is proposed to capture gas slip and surface diffusion of adsorbed gas. The simulation results match well with previous studies carried out using Molecular Dynamics (MD) and show that Maxwell slip boundary condition fails to characterize gas transport in the near wall region under the influence of the adsorbed gas. The total molar flux can be either enhanced or reduced depending on variations in adsorbed gas coverage and surface diffusion velocity. The effects of pore width, pressure as well as Langmuir properties on apparent permeability of methane transport in organic pores are further studied. It is found that the surface transport plays a significant role in determining the apparent permeability, and the variation of apparent permeability with pore size and pressure is affected by the adsorption and surface diffusion. (C) 2016 Elsevier B.V. All rights reserved.

Keyword :

Lattice Boltzmann method Surface diffusion Micro-gaseous flow Adsorbed gas

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GB/T 7714 Wang, Junjian , Kang, Qinjun , Chen, Li et al. Pore-scale lattice Boltzmann simulation of micro-gaseous flow considering surface diffusion effect [J]. | INTERNATIONAL JOURNAL OF COAL GEOLOGY , 2017 , 169 : 62-73 .
MLA Wang, Junjian et al. "Pore-scale lattice Boltzmann simulation of micro-gaseous flow considering surface diffusion effect" . | INTERNATIONAL JOURNAL OF COAL GEOLOGY 169 (2017) : 62-73 .
APA Wang, Junjian , Kang, Qinjun , Chen, Li , Rahman, Sheik S. . Pore-scale lattice Boltzmann simulation of micro-gaseous flow considering surface diffusion effect . | INTERNATIONAL JOURNAL OF COAL GEOLOGY , 2017 , 169 , 62-73 .
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