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Experimental investigation and model prediction of sliding bubble dynamics in vertical subcooled boiling flow

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 2023年 200卷

作者： yu, shuwen Peng, Changhong Zhang, Zhenze Cheng, Ning Univ Sci & Technol China Sch Nucl Sci & Technol 96 Jinzhai Rd Hefei 230026 Peoples R China China Ship Dev & Design Ctr 268 Zhangzhidong Rd Wuhan 430060 Peoples R China Univ Sci & Technol China Hefei Peoples R China

In the subcooled flow boiling, the behavior of sliding bubbles significantly affects the partition of wall heat flux, especially the transient heat flux in the sliding area. Therefore, an experimental investigation was conducted to examine sliding bubble characteristics in subcooled flow in a vertical rectangular chan-nel in this paper. The characteristics of sliding bubbles have been recorded and analyzed from size and velocity distribution, growth rate, sliding velocity, velocity-diameter dependence, and coalescence criti-cal velocity in detail. By comparing experimental data and growth models, we found that all the bub-ble growth model at the thermal control stage overestimates the growth rate of sliding bubble. During the sliding phase, the effect of condensation gradually increases and the contribution of the microlayer evaporation to the bubble growth is negligible. In addition, based on the force balance model, the dif-ferential equation of motion describing the sliding bubble is developed. The model considers the effects of buoyancy, flow drag, bubble volume expansion, and additional mass effects brought about by pressure gradients. With near-wall drag coefficient and local liquid velocity correction, the model agrees well with the experimental data and predicts diameter-velocity correlations well.(c) 2022 Elsevier Ltd. All rights reserved.

关键词： Subcooled flow boiling Sliding bubble Force balance model Sliding velocity

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Generation of oxide surface patches promoting H-spillover in Ru/(TiOx)MnO catalysts enables CO2 reduction to CO

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NATURE CATALYSIS 2023年第11期6卷 1062-1072页

作者： Kang, Hui Zhu, Ling Li, Shiyan yu, shuwen Niu, Yiming Zhang, Bingsen Chu, Wei Liu, Xingchen Perathoner, Siglinda Centi, Gabriele Liu, yuefeng Chinese Acad Sci Dalian Inst Chem Phys Dalian Natl Lab Clean Energy Dalian Peoples R China Sichuan Univ Coll Chem Engn Chengdu Peoples R China Chinese Acad Sci State Key Lab Coal Convers Inst Coal Chem Taiyuan Peoples R China Gannan Normal Univ Key Lab Organopharmaceut Chem Jiangxi Prov Ganzhou Peoples R China Univ Chinese Acad Sci Beijing Peoples R China Chinese Acad Sci Inst Met Res Shenyang Natl Lab Mat Sci Shenyang Peoples R China Univ Messina Dept ChiBioFarAm Messina Italy

The migration of reducible metal oxides (for example, TiO2) to the surface of metal nanoparticles can inhibit sintering but has a strong negative impact on the catalytic activity. Here we reveal the in situ creation of TiOx patches over an MnO support to generate effective transport channels for hydrogen spillover to form more active hydrogen species on the MnO surface which are responsible for reducing CO2 to CO, a key reaction for CO2 conversion to high-value chemicals. The Ru/(TiOx)MnO (Ru/Ti/Mn) catalyst shows a 3.3-fold increase in reverse water-gas shift performance compared with conventional Ru/MnOx catalysts. Through a combination of physicochemical methods, including in situ studies, catalytic and kinetic data, and theoretical modelling, we demonstrate that the oxide-oxide interfaces are spontaneously generated during reductive treatment in H-2, contributing to the increased activity. The results open perspectives for the design of novel selective hydrogenation catalysts via the in situ creation of oxide-oxide interfaces acting as hydrogen-species transport channels.

关键词： Manganese oxide

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Highly porous metal-organic framework glass design and application for gas separation membranes

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NATURE COMMUNICATIONS 2025年第1期16卷 1-10页

作者： Li, Shichun Ma, Chao Hou, Jingwei yu, shuwen Chen, Aibing Du, Juan Chater, Philip A. Keeble, Dean S. Qiao, Zhihua Zhong, Chongli Keen, David A. Liu, yu Bennett, Thomas D. China Acad Engn Phys Inst Chem Mat Mianyang Peoples R China Tiangong Univ State Key Lab Separat Membranes & Membrane Proc Tianjin Peoples R China Univ Queensland Sch Chem Engn St Lucia Qld Australia ARC Ctr Excellence Green Electrochem Transformat C Brisbane Australia Suzhou Univ Sch Chem & Chem Engn Suzhou Peoples R China Hebei Univ Sci & Technol Coll Chem & Pharmaceut Engn Shijiazhuang Peoples R China Diamond Light Source Ltd Diamond HouseHarwell Sci & Innovat Campus Didcot Oxon England Rutherford Appleton Lab ISIS Facil Harwell Campus Didcot Oxon England Univ Cambridge Dept Mat Sci & Met Cambridge England

Crystalline metal-organic frameworks (MOFs) exhibit enormous potential application in gas separation, thanks to their highly porous structures and precise pore size distributions. Nevertheless, the inherent limitations in mechanical stability of crystalline MOFs cause challenges in processing MOF powders into bulky structures, particularly for membrane filtrations. Melt-quenched MOF glasses boast excellent processability due to liquid-like properties. However, the melting process diminishes the inherent porosity, leading to reduced gas adsorption capacities and lower gas diffusion coefficients. In this work, we demonstrated that enhancing the porosity of MOF glasses is achievable through topological engineering on the crystalline precursors. Crystalline zeolitic imidazolate frameworks (ZIFs) with large 12-membered rings pores, including AFI and CAN topology, were synthesized by using both structure-directing agents and mixed organic ligands. The large pores are partially preserved in the melt-quenched glass as evidenced by high-pressure CO2 absorption at 3000 kPa. The agAFI-[Zn(Im)1.68(bIm)0.32] glass was then fabricated into self-supported membranes, which shows high gas separation performance, for example, CO2 permeance of 3.7 x 104 GPU with a CO2/N2 selectivity of 14.8.

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Isomeric anthracene diimide polymers

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CHEMICAL SCIENCE 2021年第8期12卷 2848-2852页

作者： Tu, Dandan Yang, Qing yu, shuwen Guo, Xin Li, Can Chinese Acad Sci Dalian Natl Lab Clean Energy Dalian Inst Chem Phys State Key Lab Catalysis Zhongshan Rd 457 Dalian 116023 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

N-type semiconducting polymers are attractive for organic electronics, but desirable electron-deficient units for synthesizing such polymers are still lacking. As a cousin of rylene diimides such as naphthalene diimide (NDI) and perylene diimide (PDI), anthracene diimide (ADI) is a promising candidate;its polymers, however, have not been achieved yet because of synthetic challenges for its polymerizable monomers. Herein, we present ingenious synthesis of two dibromide ADI monomers with dibromination at differently symmetrical positions of the ADI core, which are further employed to construct ADI polymers. More interestingly, the two obtained ADI polymers possess the same main-chain and alkyl-chain structures but different backbone conformations owing to varied linking positions between repeating units. This feature enables their different optoelectronic properties and film-state packing behavior. The ADI polymers offer first examples of conjugated polymer conformational isomers and are highly promising as a new class of n-type semiconductors for various organic electronics applications.

关键词： Conjugated polymers

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Covalently bridged MXene/COF hybrid membrane toward efficient dye separation

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SEPARATION AND PURIFICATION TECHNOLOGY 2024年 349卷

作者： Zheng, Yiling Zhang, Hongli yu, shuwen Zhou, Hongwei Chen, Weixing Yang, Jie Xian Technol Univ Sch Mat Sci & Chem Engn Xian 710021 Peoples R China Suzhou Univ Sch Chem & Chem Engn Suzhou 234000 Peoples R China Xian Polytech Univ Sch Mat Sci & Engn Xian 710048 Peoples R China

Two-dimensional (2D) MXene-based membranes combine unique atomic thickness, well-arranged interlayer channel, and have received growing attention in molecular/ion separation and transport. The low permeability and instability of MXene-based membranes in water purification enable it difficult to be utilized in practical processing. Here, we present a high water-permeability and long-lived MXene membrane by assembling 2D heterostructured MXene/COF flakes on macroporous polymeric support. The intercalation of COFs into the interlayer of Ti3C2Tx nanosheets not only increases the adjacent interlayer space, but also provides abundant molecular sieving pores, thereby enhancing the permeability of MXene membrane. While being applied in removal of organic dyes, the MXene/COF hybrid membrane exhibits a superior water permeance (up to similar to 300 L m(-2) h(-1) bar(-1)), and several satisfactorily rejections for different dyes (98.2% for congo red, 98.7% for chrome black T, 96.4% for methyl blue, and 97.2% for methyl orange) are simultaneously achieved. Additionally, the covalent anchoring of COFs on MXene surface can greatly improve the stability. The reduction of hydrophilicity of MXene surface mitigates water molecular absorption on the fluid channel wall and endow the membrane with well swell tolerance in aqueous environment. Such high performance MXene/COF hybrid membrane is mainly caused by the physical sieving mechanism supported by the repulsive interaction, as well as adsorption capability originating from porous COFs. This work provides an alternative approach for the fabrication of high performance MXene-based membranes used for highly effective dye wastewater treatment, and extends the application of 2D membranes in desalination, pollutant treatments, and resource recovery.

关键词： Ti3C2Tx MXene Covalent organic frameworks (COFs) Nanofiltration membrane Hybrid membrane Dye removal

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Three-Level Assessment of the Safety of Floating Nuclear Power Plants Under Hazard Waves

Three-Level Assessment of the Safety of Floating Nuclear Pow...

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Prognostics and System Health Management Conference (PHM-Qingdao)

作者： Yan Wu shuwen yu Ye Liu China Nuclear Power Technology Research Institute Shenzhen China University of science and technology of China (USTC) Hefei China

In comparison to land-based nuclear facilities, floating nuclear power platforms situated at sea are frequently exposed to wave impacts, resulting in periodic oscillations of the platform. These oscillations have the potential to affect systems, equipment, and pipelines. Of greater concern are the more severe effects caused by high significant wave heights and the greater energy density of destructive waves, which directly impact the health and safety of the floating nuclear power station system. To address this, it is crucial to consider the impact of extreme ocean conditions caused by waves as a design basis accident, utilizing a deterministic evaluation approach. Therefore, this paper presents a three-level framework for analyzing the hazards of waves in the context of floating nuclear power platforms. It systematically evaluates the impact of wave hazards by considering three key aspects: statistical analysis of wave intensity and frequency in the sea area, hydrodynamic simulation of the floating nuclear power station, and assessment of system safety.

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Reliability Assessment of Passive Ehrs of Iris Based on the Am-Sis-Ann Method

SSRN

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SSRN 2024年

作者： Jiang, Hong Li, Haiying yu, shuwen Peng, Changhong School of Nuclear Science and Technology University of Science and Technology of China No.96 Jinzhai Road Baohe District Hefei230026 China Nuclear Power Institute of China No. 328 Section 1 Changshun Avenue Shuangliu District Chengdu610040 China

This paper presents a new method, AM-SIS-ANN, for reliability estimation of passive systems in nuclear power plants, enhancing safety. It combines Adaptive Metamodel Subset Simulation Importance Sampling (AM-SIS) with neural networks (ANN) to overcome the limitations of deterministic failure criteria and manage uncertainty. AM-SIS calculates failure probabilities in low-probability areas, while ANN handles other regions, reducing computation time. Validated through numerical examples, the method is applied to the Emergency Heat Removal System (EHRS) of the IRIS reactor, achieving a 23.4% time reduction compared to AM-SIS and a 57.5% reduction compared to ANN, ensuring accuracy and efficiency under uncertain failure criteria. © 2024, The Authors. All rights reserved.

关键词： Nuclear power plants

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MiR-100-5p-rich small extracellular vesicles from activated neuron to aggravate microglial activation and neuronal activity after stroke

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JOURNAL OF NANOBIOTECHNOLOGY 2024年第1期22卷 534页

作者： Xin, Danqing Li, Tingting Zhao, Yijing Guo, Xiaofan Gai, Chengcheng Jiang, Zige yu, shuwen Cheng, Jiao Song, Yan Cheng, Yahong Luo, Qian Gu, Bing Liu, Dexiang Wang, Zhen Shandong Univ Cheeloo Coll Med Sch Basic Med Sci Dept Physiol 44 Wenhua Xi Rd Jinan 250012 Shandong Peoples R China Loma Linda Univ Hlth Dept Neurol Loma Linda CA 92354 USA Shandong Univ Cheeloo Coll Med Sch Basic Med Sci Dept Med Psychol & Eth Jinan 250012 Shandong Peoples R China

Ischemic stroke is a common cause of mortality and severe disability in human and currently lacks effective treatment. Neuronal activation and neuroinflammation are the major two causes of neuronal damage. However, little is known about the connection of these two phenomena. This study uses middle cerebral artery occlusion mouse model and chemogenetic techniques to study the underlying mechanisms of neuronal excitotoxicity and severe neuroinflammation after ischemic stroke. Chemogenetic inhibition of neuronal activity in ipsilesional M1 alleviates infarct area and neuroinflammation, and improves motor recovery in ischemia mice. This study identifies that ischemic challenge triggers neuron to produce unique small extracellular vesicles (EVs) to aberrantly activate adjacent neurons which enlarge the neuron damage range. Importantly, these EVs also drive microglia activation to exacerbate neuroinflammation. Mechanistically, EVs from ischemia-evoked neuronal activity induce neuronal apoptosis and innate immune responses by transferring higher miR-100-5p to adjacent neuron and microglia. MiR-100-5p can bind to and activate TLR7 through U18U19G20-motif, thereby activating NF-kappa B pathway. Furthermore, knock-down of miR-100-5p expression improves poststroke outcomes in mice. Taken together, this study suggests that the combination of inhibiting aberrant neuronal activity and the secretion of specific EVs-miRNAs may serve as novel methods for stroke treatment.

关键词： Neuronal activity Small extracellular vesicles MiR-100-5p Microglial activation Stroke

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The efficacy and safety of a novel PD-1/CTLA-4 bispecific antibody cadonilimab (AK104) in advanced non-small cell lung cancer: A multicenter retrospective observational study

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THORACIC CANCER 2024年第32期15卷 2327-2338页

作者： Li, Hongxin Zhao, Wen Li, Chengming Shen, Hongchang Li, Meiying Wang, Chengjun Han, Chunyan Yi, Cuihua Wang, Jun Meng, Xue Liu, Lian yu, shuwen Li, Jisheng Shandong Univ Cheeloo Coll Med Sch Pharmaceut Sci Jinan Peoples R China Shandong Univ Qilu Hosp Cheeloo Coll Med Dept Med Oncol Jinan Peoples R China Shandong First Med Univ & Shandong Acad Med Sci Shandong Canc Hosp & Inst Dept Radiat Oncol Jinan Peoples R China Shandong First Med Univ Dept Oncol Shandong Prov Hosp Jinan Peoples R China Shandong First Med Univ Clin Trial Ctr Shandong Prov Hosp Jinan Peoples R China Shandong Univ Shandong Prov Hosp 3 Dept Oncol Jinan Peoples R China Shandong First Med Univ & Shandong Acad Med Sci Affiliated Hosp 3 Dept Radiotherapy Jinan Peoples R China Shandong First Med Univ Dept Oncol Affiliated Hosp 1 Jinan Peoples R China Shandong Prov Qianfoshan Hosp Jinan Peoples R China Shandong Lung Canc Inst Jinan Peoples R China Shandong Univ Qilu Hosp Cheeloo Coll Med Dept Pharm Jinan Peoples R China Shandong Univ Clin Trial Ctr NMPA Key Lab Clin Res & Evaluat Innovat Drugs Jinan Peoples R China

BackgroundFor patients with advanced non-small cell lung cancer (NSCLC) who have received frontline immunochemotherapy, subsequent treatment options are limited. As the first dual programmed cell death-1 (PD-1)/cytotoxic T lymphocyte-associated antigen-4 bispecific antibody approved globally, cadonilimab demonstrated potential antitumor activity in advanced NSCLC patients resistant to anti-PD-1/PD-L1 *** retrospectively collected efficacy and safety data from advanced NSCLC patients treated with cadonilimab-based regimens in later therapy *** total of 41 advanced NSCLC patients refractory to anti-PD-1/PD-L1 therapy were enrolled. More than half of the patients received cadonilimab-based regimen as a fourth or later line of treatment. At the data cutoff date, treatment efficacy could be evaluated in 23 patients. One patient (4.3%) achieved partial response, eight patients (34.8%) experienced stable disease, and 14 patients (60.9%) progressed. The objective response rate and disease control rate were 4.3% and 39.1%, respectively. The median progression-free survival for all evaluated patients was 108.0 days. Due to the short follow-up period, the median overall survival has not yet been reached. Treatment-related adverse events (TRAEs) and immune-related AEs occurred in 63.4% and 22% patients, respectively. The most common TRAEs included gamma-glutamyl transferase elevation (17.1%), coughing (14.6%), and fatigue (12.2%). Five patients (12.2%) experienced grade >= 3 *** this heavily pretreated cohort of advanced NSCLC patients, cadonilimab-based regimens showed moderate antitumor efficacy with a generally tolerable and manageable safety profile. However, more evidence is needed to support the administration of cadonilimab in NSCLC patients refractory to previous anti-PD-1/PD-L1 therapy. The efficacy and safety of a novel PD-1/CTLA-4 bispecific antibody cadonilimab (AK104) in advanced ***

关键词： bispecific antibody cadonilimab CTLA-4 non-small cell lung cancer PD-1

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Nano-Single-Atom Heterointerface Engineering for pH-Universal Electrochemical Nitrate Reduction to Ammonia

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ADVANCED FUNCTIONAL MATERIALS 2024年第49期34卷

作者： Song, Jian Qian, Sheng-jie Yang, Wenqiang Mu, Jiali Li, Jingwei Liu, Yaping Sun, Fanfei yu, shuwen Xu, Feifei Song, Xiangen Deng, Dehui Wang, Yang-gang Yan, Li Ding, yunjie Chinese Acad Sci Dalian Inst Chem Phys Dalian Natl Lab Clean Energy Dalian 116023 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Southern Univ Sci & Technol Dept Chem Guangdong Prov Key Lab Catalyt Chem Shenzhen 518055 Peoples R China Chinese Acad Sci Dalian Inst Chem Phys State Key Lab Catalysis Dalian 116023 Peoples R China Chinese Acad Sci Shanghai Adv Res Inst Shanghai Synchrotron Radiat Facil Shanghai 201204 Peoples R China

Nano-single-atom-catalysts have the potential to combine the respective advantages of both nano-catalysts and single-atom-catalysts and thus exhibit enhanced performance. Generally, the separation of active sites in space limits the interaction between single atoms and nanoparticles. Heterointerface engineering has the potential to break this limitation. Regretfully, studies on the interface effect between single atoms and nanoparticles are rarely reported. Herein, an unprecedented nano-single-atom heterointerface composed of Fe single-atoms and carbon-shell-coated FeP nanoparticles (Fe SAC/FeP@C) is demonstrated as an efficient electrocatalyst for the nitrate reduction process from alkaline to acidic. Compared with typical nano-single-atom-catalysts (Fe SAC/FePO4) and single-atom-catalysts (Fe SAC), the constructed Fe SAC/FeP@C heterostructure exhibits dramatically enhanced nitrate-to-ammonia performance. Especially in acidic media, the maxmium Faradaic efficiency of ammonia (NH3) can reach 95.6 +/- 0.5%, with a maximum NH3 yield of 36.2 +/- 3.1 mg h-1 mgcat-1 (pH = 1.2), which is considerably higher than previously reported. Density functional theory calculations and in situ spectroscopic investigations indicate that the unique charge redistribution at the interface, together with the optimized electronic structure of Fe single-atoms, strengthens intermediate adsorption and catalytic activity. This work provides a feasible strategy for designing nano-single-atom-catalysts with unique heterointerfaces, as well as valuable insights into nitrate conversion under environmentally relevant wastewater conditions. A unique nano-single-atom heterostructure is constructed for pH-universal nitrate-to-ammonia reduction reaction (especially in strong acidic media). Controlled experiments and mechanistic studies demonstrate that the unique charge redistribution at the interface, together with the optimized electronic structure of active centers, strengthens intermediate adsorpt

关键词： heterointerface in-situ spectroscopy nano-single-atom catalysts nitrate reduction reaction pH-universal

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