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arXiv 2022年

作者： Zhang, Jinlei Zhang, Jiayong Cui, Dapeng Ye, Li Gong, Shuainan Wang, Zhichao Wu, Zhenping Ma, Chunlan Gao, Ju Zhao, Yuanyuan Jiang, Yucheng 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 Suzhou215009 China Department of Physics Faculty of Science National University of Singapore Singapore117551 Singapore State Key Laboratory of Information Photonics and Optical Communications School of Science Beijing University of Posts and Telecommunications Beijing100876 China School for Optoelectronic Engineering Zaozhuang University Shandong277160 China School of Physics and Optoelectronic Engineering Nanjing University of Information Science and Technology Nanjing210044 China

Electronic phase separation (EPS) originates from an incomplete transformation between electronic phases, causing the inhomogeneous spatial distribution of electronic properties. In the system of two-dimensional electron gas (2DEG), the EPS is usually identified based on a percolative metal-to-superconductor transition. Here, we report a metal-insulator transition (MIT) in KTaO3-based 2DEG with the width of conductive channel decreasing into micrometer scale. Hysteretic resistance-temperature relations are observed due to the competition between metallic and insulating phases, which is tunable by magnetic field. Such a size-dependent MIT effect is attributed to the coexistence and separation of metallic and insulating phases. Combining density functional theory calculation, we propose a theoretical model to simulate the dynamic process of the EPS using the percolation theory, demonstrating the mechanism of size-dependent MIT. Our work suggests a clear and simple 2DEG platform to achieve the spatial coexistence of metallic and insulating phases. © 2022, CC BY.

关键词： Metal insulator transition

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Effect of Template Concentration on the Crystallinity and Catalytic Performance of SAPO-34 Molecular Sieve（摘要）

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华东理工大学学报（自然科学版） 2011年第2期37卷 243-243页

作者： WANG Qian WANG Lei LI Zeng-xi MO You-bin WU Hui LI Guang-ming ZHANG Xiang-ping ZHANG Suo-jiang Graduate University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Multiphase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China

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Preparation and characterization of high softening point and homogeneous isotropic pitches produced from distilled ethylene tar by a novel bromination method

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Carbon 2018年 134卷 537-537页

作者： Chuan-zhang Ge Zhen-long Sun Hai-xiao Yang Dong-hui Long Wen-ming Qiao Li-cheng Ling State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China Shanghai Key Laboratory of Multiphase Materials Chemical Engineering East China University of Science and Technology Shanghai 200237 China

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Vapor condensation with low air mass fraction inside water seal branch tube under free convection

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Nuclear engineering and Design 2021年 379卷

作者： Bing Tan Xi Wang Y.W. Wu W.X. Tian S.Z. Qiu G.H. Su School of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University 28 Xianning West Road Xi an 710049 China School of Electric Power South China University of Technology Guangzhou 510640 China

The pressure vessel has used a newly designed water seal structure, and the sealed water is from condensation at low hydrogen concentration. To get the condensation capacity of the water seal branch tube under the pressure vessel normal operation, the experimental loop named WASETEL was constructed, which is aimed at studying the heat transfer during the process of air-steam mixture condensation inside the inclined branch tube at the condition of low air mass fraction. The inner tube is diameter 0.134 m with length 0.68 m which is connected with diameter 1.4 m, high 2.5 m pressure vessel. A canon camera was set to record the images and videos of the condensate height through glass tube in communicating vessel liquidometer. The experiment was conducted under the pressure ranged from 0.2 to 0.6 MPa, air mass concentration ranged from 0.49 to 6.42% and wall subcooling ranged from 11 to 40 K. The test showed HTC (heat transfer coefficient) would sharply deteriorate with the small air fraction, compared with pure steam condensation, about 0.49% mass fraction of the air will reduce heat transfer coefficient by 70–80%. When air concentration is relatively small, those widely used relations can not predict the condensation well, therefore, a new heat transfer empirical correlation with air mass fraction, pressure and subcooling is proposed, covered all the experimental data within the error band ±13%.

关键词： Natural condensation New empirical correlation Water seal

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Experimental Study on Microscopic Pore-Scales Crude Oil Production Characteristics and Influencing Factors During Dynamic Imbibition of Shale Reservoir with Online Nmr

SSRN

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SSRN 2024年

作者： Du, Meng Yang, Zhengming Lv, Weifeng Xiao, Qainhua Qi, Xiang Yao, Lanlan Feng, Chun University of Chinese Academy of Sciences Beijing100049 China Institute of Porous Flow & Fluid Mechanics Chinese Academy of Sciences Langfang065007 China Research Institute of Petroleum Exploration & Development PetroChina Beijing100083 China State Key Laboratory of Enhanced Oil Recovery Beijing100083 China School of Oil and Gas Engineering Chongqing University of Science & Technology Chongqing401331 China

Dynamic imbibition and displacement between the matrix and fractures in shale reservoirs can significantly enhance oil recovery (EOR) following initial depletion. However, the microscopic production characteristics and seepage mechanisms at different pore scales during the dynamic imbibition process remain incompletely understood. In this study, we established an online physical simulation experiment method that combines dynamic displacement and imbibition based on nuclear magnetic resonance (NMR), and a series of online NMR water flooding dynamic imbibition experiments were conducted. Through real-time dynamic monitoring of multiphase flow and migration behavior of crude oil in each stage of dynamic imbibition, the microscopic production characteristics and influencing factors were quantitatively studied from the recovery and residual oil saturation field distribution of different scale pores, the contribution mechanism of imbibition and displacement to EOR were investigated....,Notably, fractures can effectively increase the imbibition contact area, reduce oil-water seepage resistance, and increase the contribution of displacement to recovery by 21.65%. This study provides theoretical support for clarifying the interaction between matrix-fracture imbibition and displacement and for the efficient development of shale oil. © 2024, The Authors. All rights reserved.

关键词： Fracture

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Efficient Water Reforming of Biomass to H2via Well-Organized Redox-Neutral Cleavage of C−C, O−H and C−H Bonds

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Angewandte Chemie 2024年第4期137卷

作者： Wen-Min Zhang Prof. Yang Li State Key Laboratory of Multi-phase Flow in Power Engineering and Frontier Institute of Science and Technology Xi'an Jiaotong University Xi'an 712046 China

Hydrogen (H 2 ) is a clean and environmentally friendly energy carrier. The depletion of fossil fuels makes renewable H 2 production highly desirable. Water reforming of renewable biomass to hydrogen, with a relay of natural photosynthesis to biomass, would be an indirect pathway to realize the ideal but extremely challenging photocatalytic overall water splitting to hydrogen, with favorable thermodynamics. Since the seminal work of water reforming of biomass in 1980, great endeavors have been made. Nevertheless, hitherto, the entire kinetic pathway has been elusive, which seriously limits the reforming processes. Using a designed well-organized redox-neutral cleavage of C−C, O−H and C−H bonds enabled by photoelectrocatalysis, here, we show the efficient water reforming of biomass to hydrogen at room temperature, with a yield up to 93 %. The clear insights into the kinetic pathway with oxidation of carbon radicals to carbon cations as the indicated rate-determining step, would cast brightness for efficient and sustainable hydrogen production to accelerate the hydrogen economy.

关键词： hydrogen production biomass reforming photoelectrocatalysis iron catalysis redox-neutral chemical bonds cleavage

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Study on the Structure, Magnetic Properties and Microwave Absorbing Properties of Rare Earth Doped Cobalt Ferrite: The Influence Mechanism of Different Substitution Positions

SSRN

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SSRN 2022年

作者： Jing, Xiaodong Guo, Mohan Li, Ziyu Qin, Ciyu Chen, Zitao Li, Zuoguang Gong, Huayang Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341000 China State Key Laboratory of Multiphase Complex Systems Beijing Engineering Research Centre of Process Pollution Control Institute of Process Engineering Chinese Academy of Sciences No.1 2nd North Street ZhongGuanCun Beijing100190 China School of Rare earths University of Science and Technology of China Hefei230026 China University of Chinese Academy of Sciences Beijing100049 China Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Beijing100083 China Science and Technology China University of Geosciences Beijing100083 China

In order to better understand the influence mechanism and law of rare earth (RE) doping on the properties of cobalt ferrite (CFO), RE (including La, Ce, Pr, Nd, Sm, Gd, Ho, Er, Yb, Y) doped CFO nanoparticles were synthesized by sol-gel auto combustion method and other methods. The different roles of RE added to CFO in changing cation distribution and further affecting structure, magnetism and microwave absorption properties due to different substitution positions are studied and reported. The crystal structure formation and crystallite size are studied by X-ray diffraction and the results showed that the replacement of Co2+ ions by RE 3+ ions was more likely to lead to larger lattice distortion and smaller grains compared with the replacement of Fe3+ ions by RE3+ ions. Room temperature magnetization measurements show that the saturation magnetization of CFO decreases with the substitution of RE3+ ions, and the change of coercivity is related to the substitution position and type of RE3+ ions. The coercivity increases significantly with the substitution of Co2+ ions by RE3+ , reaching a maximum of 2423 Oe (Co0.8Gd0.2Fe2O4), and decreases with the substitution of Fe3+ ions by RE3+ . The substitution of Fe3+ ions by Ce3+ , Nd3+ , Yb3+ and Er3+ (substitution amount x=0.05) lead to the increase of remanence. Gd3+ , La3+ , Nd3+ and Y3+ doping can improve the microwave absorption performance of CFO, and Co0.9Nd0.1Fe2O4 had the lowest reflection loss of about -23.35 dB at frequency of 11.12 GHz, corresponding to ~99% microwave energy being absorbed. However, the microwave absorbing property is sensitive to the doping amount. Therefore, the synergistic effect of RE doping and structural regulation is needed to improve the microwave absorption performance. © 2022, The Authors. All rights reserved.

关键词： Ions

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Droplet Control Based on Pinning and Substrate Wettability

arXiv

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arXiv 2023年

作者： Theodorakis, Panagiotis E. Amirfazli, Alidad Hu, Bin Che, Zhizhao Institute of Physics Polish Academy of Sciences Al. Lotników 32/46 Warsaw02-668 Poland Department of Mechanical Engineering York University TorontoONM3J 1P3 Canada Flow Capture AS Industriveien 1 Skedsmokorset2020 Norway State Key Laboratory of Engines Tianjin University Tianjin300072 China

Pinning of liquid droplets on solid substrates is ubiquitous and plays an essential role in many applications, especially in various areas, such as microfluidics and biology. Although pinning can often reduce the efficiency of various applications, a deeper understanding of this phenomenon can actually offer possibilities for technological exploitation. Here, by means of molecular dynamics simulation, we identify the conditions that lead to droplet pinning or depinning and discuss the effects of key parameters in detail, such as the height of the physical pinning-barrier and the wettability of the substrates. Moreover, we describe the mechanism of the barrier crossing by the droplet upon depinning, identify the driving force of this process, and, also, elucidate the dynamics of the droplet. Not only does our work provide a detailed description of the pinning and depinning processes, but it also explicitly highlights how both processes can be exploited in nanotechnology applications to control droplet motion. Hence, we anticipate that our study will have significant implications for the nanoscale design of substrates in micro and nano-scale systems and will assist with assessing pinning effects in various applications. © 2023, CC BY.

关键词： Drops

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Highly Efficient Electrocatalytic CO2Reduction to C2+Products on a Poly(ionic liquid)-Based Cu0–CuITandem Catalyst

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Angewandte Chemie 2021年第9期134卷

作者： Dr. Guo-Yi Duan Xiao-Qiang Li Guang-Rong Ding Prof. Dr. Li-Jun Han Prof. Dr. Bao-Hua Xu Prof. Dr. Suo-Jiang Zhang Beijing Key Laboratory of Ionic Liquids Clean Process CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China School of Chemical Engineering University of Chinese Academy of Sciences Beijing 100049 China

Electroreduction of CO 2 on a polymer-modified Cu-based catalyst has shown high multi-electron reduction (>2 e − ) selectivity, however, most of the corresponding current densities are still too small to support industrial applications. In this work, we designed a poly(ionic liquid) (PIL)-based Cu 0 –Cu I tandem catalyst for the production of C 2+ products with both high reaction rate and high selectivity. Remarkably, a high C 2+ faradaic efficiency (FE ) of 76.1 % with a high partial current density of 304.2 mA cm −2 is obtained. Mechanistic studies reveal the numbers and highly dispersed Cu 0 -PIL-Cu I interfaces are vital for such reactivity. Specifically, Cu nanoparticles derived Cu 0 -PIL interfaces account for high current density and a moderate C 2+ selectivity, whereas Cu I species derived PIL-Cu I interfaces exhibit high activity for C−C coupling with the local enriched *CO intermediate. Furthermore, the presence of the PIL layer promotes the C 2+ selectivity by lowering the barrier of C−C coupling.

关键词： CO2 conversion Electrochemistry Ionic liquids Polymer modification Tandem catalyst

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Preparation of Superhydrophobic Coating with Anti-Corrosion and Anti-Fouling Properties on the Surface of Low Manganese Steel by Electrodeposition Technology

SSRN

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SSRN 2023年

作者： Zhang, Lunliang Liu, Xiang Yan, Jingmin Li, Zhengchen Huang, Siyu Weng, Yao Li, Jiang Yuan, Chenzong Han, Peiwei Ye, Shufeng Zhang, Xiaomeng School of Rare earths University of Science and Technology of China Hefei230026 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341119 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences PO Box 353 Beijing100190 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Innovation Academy for Green Manufacture Chinese Academy of Sciences Beijing100190 China

As a rare earth slow-release agent, the yttrium (Y) element was often used in anti-corrosion coatings at high temperatures. Still, its application in anti-corrosion coatings at room temperature was rarely studied. Therefore, in this study, a stearic acid-yttrium (SA–Y) superhydrophobic coating was prepared in one step on the surface of low manganese steel by electrodeposition technique. Different electroplating voltages were applied to the electrolyte composed of Y(NO3)3·6H2O and stearic acid (SA), and the effect of the voltage on the surface morphology and wettability of the coating were studied. The results show that the optimum water contact angle of SA–Y superhydrophobic coating is about 162.1 ± 1.2 °, and the corrosion current density of the coating (8.68 × 10-10 A/cm2) is four orders of magnitude lower than that of the low-manganese steel sample (1.22 × 10-6 A/cm2), which confirmed that the coating has good corrosion resistance. At the same time, the soil powders cannot adhere to the surface of SA–Y superhydrophobic coating, indicating that the coating also has good anti-fouling properties. And studies have shown that during the corrosion process, a dense protective layer can be formed on the damaged coating surface to prevent further corrosion of the metal, so the coating has good active protection ability. Therefore, the coating prepared in this study has a good application prospect in the field of ship anti-corrosion. © 2023, The Authors. All rights reserved.

关键词： Morphology

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