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Waste Tire-Derived Graphene Modified Carbon as Anodes for Sodium-Ion Batteries

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SSRN 2024年

作者： Zhou, Ziyi Wang, Silang Wen, Bo Xiao, Jiyuan Yang, Guorui Ding, Shujiang School of Chemistry Engineering Research Center of Energy Storage Materials and Devices Ministry of Education "Four Joint Subjects One Union" School Enterprise Joint Research Center for Power Battery Recycling & Circulation Utilization Technology Xi’an Jiaotong University Xi’an710049 China Xi’an Key Laboratory of Solid Waste Recycling and Resource Recovery State Key Laboratory of Multiphase Flow in Power Engineering Department of Environmental Science and Engineering Xi’an Jiaotong University Xi’an710049 China

The rational disposal of waste tires poses a ubiquitous challenge globally. Pyrolytic carbon black, a solid by-product produced through pyrolysis, has great application prospects. Carbon-based materials are regard as the most potential commercial anode materials for sodium-ion batteries (SIBs) ， which features cheap, environmentally friendly, and low reaction potential. In this study, three-dimensional vertical graphene composite (TCBp@VGSs) was synthesized from waste tires. The graphene with higher defectiveness offers an increased number of active sites for Na+, while the vertically aligned graphene facilitates rapid electron transfer. As a result, the TCBp@VGSs electrode demonstrates the ability to maintain a reversible capacity of 252.7 mA h g-1 after 100 cycles at a current density of 0.2 A g-1. Furthermore, it exhibits a sustained rate performance of 105.4 mA h g-1 at a current density of 5 A g-1. Moreover, even after 1900 cycles at a current density of 1 A g-1, a reversible capacity of 171.5 mA h g-1 is retained, showcasing good stability and a significantly higher capacity compared to TCBp-1100. This study introduces novel approaches for the high-value utilization of solid-phase by-products from waste tires, offering certain economic benefits, and contributes fresh insights into the advancement of SIBs anodes. © 2024, The Authors. All rights reserved.

关键词： Graphene

Effect of nozzle size on the surface heat transfer dynamics during cryogen spray cooling in dermatologic laser surgery

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Zhongguo Jiguang/Chinese Journal of Lasers 2012年第3期39卷

作者： Zhou, Zhifu Wang, Rui Wang, Guoxiang Guo, Liejin Chen, Bin Wang, Yueshe State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 China Department of Mechanical Engineering University of Akron Akron OH 44325 United States

Cryogen spray cooling (CSC) in conjunction with laser therapy has been the clinical standard for hypervascular lesions. In order to optimize nozzle and enhance the cooling efficiency to improve the treatment of laser surgery, an experimental system of transient cryogen spray cooling is built and eight straight-tube nozzles with different diameter and length are designed. A thin film thermocouple is directly deposited on the cooling surface to measure the surface temperature during the cryogen spray cooling. An analytical expression based on Fourier's law and Duhamel's theorem is used to calculate surface heat flux from the temperature measurements. Based on the measurements and calculations, the effect of the eight straight-tube nozzles on the heat transfer dynamics of the cooling surface and the atomization characterics are comparatively studied. Additionally, the criterion to evaluate the cooling efficiency of different nozzles is proposed, and the variation of heat extraction from the cooling surface with different spray distances by different nozzles is given.

关键词： Heat flux

Bowl-Shaped Carbon Loaded Co9s8 Nanoparticles Connected by Carbon Nanotubes with Excellent Rate Performance for Sodium-Ion Batteries

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SSRN 2022年

作者： Yang, Guorui Zhou, Ziyi Liu, Xiaofeng Zhang, Yue Wang, Silan Yan, Wei Ding, Shujiang School of Chemistry Engineering Research Center of Energy Storage Materials and Devices Ministry of Education "Four Joint Subjects One Union" School Enterprise Joint Research Center for Power Battery Recycling & Circulation Utilization Technology Xi’an Jiaotong University Xi’an710049 China Xi'an Key Laboratory of Solid Waste Recycling and Resource Recovery State Key Laboratory of Multiphase Flow in Power Engineering Department of Environmental Science and Engineering Xi'an Jiaotong University Xi'An710049 China

Sodium-ion batteries (SIBs) are expected to replace lithium-ion batteries in the energy storage sector owing to their low cost and abundant resources. However, developing suitable anode materials to meet the high energy density requirements of SIBs remains an ongoing challenge. Herein, we design a hollow nitrogen-doped bowl-like carbon decorated with Co9S8 nanoparticles linked by carbon nanotubes (HNBC@Co9S8@CNTs) as an anode material for SIBs. The HNBC@Co9S8@CNTs electrode exhibits impressive rate performance (280.9 mAh g-1 at 5 A g-1) and cycling stability (426.5 mAh g-1 after 500 cycles at high current density of 1 A g-1) due to the advantages of highly conductive three-dimensional (3D) interconnected structures. In addition, its pseudo-capacitance and sodium storage diffusion kinetics are analyzed in depth using Cyclic Voltammetry (CV) and galvanostatic intermittent titration technique (GITT). The results elucidate that the partially surface-induced capacitive sodium storage, highly conductive 3D interconnected structures, and fast reaction kinetics synergistically contribute to the high-rate performance. This work may provide new insights for the fabrication of various metal sulﬁde or sulﬁde composites with high sodium storage capacity. © 2022, The Authors. All rights reserved.

关键词： Sodium-ion batteries

Thermoacoustic convection simulation using FCT method

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Huagong Xuebao/CIESC Journal 2011年第SUPPL. 1期62卷 72-76页

作者： Feng, Liang Han, Wei Zhou, Zhijie Liu, Jiping State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi China The 701 Research Laboratory of China Shipbuilding Industry Wuhan 430064 Hubei China

Numerical oscillation can easily be found in dealing with the thermoacoustic convection problems for its steep gradient in consideration of which flux-correct transport algorithm (FCT) and timestep splitting technique was considered. FCT combining with timestep splitting techniques method had been presented to simulate the steep gradient thermoacoustic convection problems which was caused by impulse heating. The simulated results had a nice agreement with the experiment. These analysis and comparisons indicated that this method completely can be used for simulating thermoacoustic convection. © All Rights Reserved.

关键词： Thermoacoustics

Interlink between Abnormal Water Imbibition in Hydrophilic and Rapid flow in Hydrophobic Nanochannels

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Physical Review Letters 2024年第18期132卷 184001-184001页

作者： Runfeng Zhou Mehdi Neek-Amal Francois M. Peeters Bofeng Bai Chengzhen Sun State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an Shaanxi 710049 China Department of Physics Shahid Rajaee Teacher Training University 16875-163 Lavizan Tehran Iran Departement Fysica Universiteit Antwerpen Groenenborgerlaan 171 B-2020 Antwerpen Belgium Departamento de Física Universidade Federal do Ceará Fortaleza-CE 60455-760 Brazil

Nanoscale extension and refinement of the Lucas-Washburn model is presented with a detailed analysis of recent experimental data and extensive molecular dynamics simulations to investigate rapid water flow and water imbibition within nanocapillaries. Through a comparative analysis of capillary rise in hydrophilic nanochannels, an unexpected reversal of the anticipated trend, with an abnormal peak, of imbibition length below the size of 3 nm was discovered in hydrophilic nanochannels, surprisingly sharing the same physical origin as the well-known peak observed in flow rate within hydrophobic nanochannels. The extended imbibition model is applicable across diverse spatiotemporal scales and validated against simulation results and existing experimental data for both hydrophilic and hydrophobic nanochannels.

关键词： Imbibition & injection Nanofluidics Molecular dynamics Navier-Stokes equation

Modeling and analysis on linear state-space dynamics of transcritical CO2 ejector refrigeration cycle

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Modeling and analysis on linear state-space dynamics of tran...

2nd International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control(IWHT2013)(2013年第二届节能减排传热进展国际研讨会)

作者： He Yang Deng Jianqiang Zhang Zaoxiao State Key Laboratory of Multiphase Flow in Power Engineering Xi''an Jiaotong University Xi''an 710049 P.R.China School of Chemical Engineering and Technology Xi''an Jiaotong University Xi''an 710049 P.R.China School of Chemical Engineering and Technology Xi''an Jiaotong University Xi''an 710049 P.R.China

The transcritical CO2 ejector refrigeration cycle (TERC) is a complex, highly nonlinear and strong coupling system, which is usually very difficult to apply advanced control *** order to solve the problem, a linear dy... 详细信息

关键词： linearization state-space transcritical CO2 refrigeration ejector dynamic

Boiling of Water Droplet in Glass-Oil-Water multiphase System

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SSRN 2022年

作者： He, Xiaotian Cheng, Yiwei Xu, Jinliang Yu, Xiongjiang Xie, Jian Ma, Xiaojing Ren, Yong Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization North China Electric Power University Beijing102206 China Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education North China Electric Power University Beijing102206 China Research Group for Fluids and Thermal Engineering University of Nottingham Ningbo China Ningbo315100 China

Boiling of a volatile droplet in a non-volatile liquid becomes complex due to various interface interactions in a solid-liquid-liquid system. Available studies reported explosive boiling and attributed the phenomenon to heterogeneous nucleation due to solid-liquid contact. Here, we investigate boiling of ~2 mm diameter water droplet in a silicon oil pool with glass container. Two transition temperatures are observed, with one as the transition from evaporation to boiling (122.5 o C), and the other as the transition from bubble growth in oil side to that in both oil and water side (160.0 o C). Correspondingly, four boiling modes of evaporation (E), boiling in water (BIW: bubble nucleation at glass-water interface and growth inside drop), boiling in oil (BIO: nucleation at oil-water interface and growth in oil), and boiling in oil and water (BIOW: nucleation at oil-water interface and growth in oil and water), are identified. For the first time, boiling bifurcation is found for drop boiling in a three-phase system. For oil temperature T b in the range of (122.5~160.0) o C, boiling mode switches in between BIW and BIO. On the contrary, for T b beyond of 160.0 o C, either BIW or BIOW occurs. This bifurcation is explained by the fact that a droplet prefers to choose smaller activation energy between that for bubble nucleation at solid-water interface and that for bubble nucleation at oil-water interface. Interfacial instabilities are analyzed to explain why BIOW boils more violently than BIW. Our work presents a comprehensive understanding of droplet boiling in the three-phase system. © 2022, The Authors. All rights reserved.

关键词： Bifurcation (mathematics)

Fault Diagnosis of Rolling Bearing Using Cnn and Pca Fractal Based on Feature Extraction

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SSRN 2023年

作者： Xiao, Junqing Li, Chun Yue, Minnan Xu, Zifei Liu, Qingsong School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai200093 China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai200093 China Department of Maritime and Mechanical Engineering Liverpool John Moores University Byrom Street LiverpoolL3 3AF United Kingdom

A novel adaptive decomposition algorithm based on CEMMDAN and fractal dimension is proposed in this study in order to overcome the limitations like redundancy and mode confusion that exist in traditional EMD based algorithms. An intelligent fault diagnosis model is developed based on CNN and the proposed CEMMDAN for improving the performance of states recognition of rolling bearings. all sub-signals generated by CEEMDAN are selected and reconstructed by the PCA and fractal dimension. In the part if feature extraction and pattern recognition, the proposed ICEEMDAN uses CNN to extract advanced features from the reconstructed signal for developing the intelligent diagnosis model. The performance of the proposed method is examined by rolling bearing experiments. The superiority and reliability of the proposed ICEEMDAN method are compared with some CNN-based diagnosis method. Due to the investigation and examination, the proposed ICEEMDAN method has strong robustness even dealing with the noisy testing background. © 2023, The Authors. All rights reserved.

关键词： Empirical mode decomposition

Development and application of a coal combustion life cycle on-line monitoring system

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Energy engineering: Journal of the Association of Energy engineering 2015年第1期112卷 28-46页

作者： Liu, Haiyu Tan, Houzhang Xiong, Xiaohe Ma, Lin Miao, Yang Xu, Tongmo Taiyuan University of Technology 030024 China Xi'an Jiaotong University Xi'an710049 China Electric Power Research Institute Co. Ltd Beijing100069 China School of Process Environmental and Materials Engineering Centre for Computational Fluid Dynamics University of Leeds LS2 9JT United Kingdom State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

In China, coal quality fluctuates and deviates greatly from the original design in many large-scale coal-fired power plants. To maintain a secure level and combustion efficiency, a "coal combustion life cycle online monitoring system" (CLMS) has been developed and installed on a 215MW boiler in China. Ten temperature detectors have been installed at the heights of three-layer burners along the furnace. To improve the accuracy of measuring unburnt carbon in fly ash, an adjustable microwave test facility was established. An on-line measurement device for unburnt carbon in ash has been newly developed and attached to the convection flue gas pass. To optimize combustion processes, a real-time neural network prediction model for coal calorific value has been developed. By calculating and analyzing the data in computer workstations, safety evaluation of burner ignition, economic analysis and energy loss analysis can be obtained in real time. As for fluctuation in coal quality, application of the system has improved boiler efficiency more than 1.0%, and reduced NOx by 10-15%. © Copyright Association of Energy Engineers (AEE).

关键词： Life cycle