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Sustainable chemical upcycling of waste polyolefins by heterogeneous catalysis

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SusMat 2022年第2期2卷 161-185页

作者： Mingyu Chu Weilin Tu Shuangqiao Yang Congyang zhang Qingye Li qiao zhang Jinxing Chen Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhouP.R.China State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan UniversityChengduP.R.China Department of Chemistry University of Western OntarioLondonOntarioCanada College of Food Science Sichuan Agricultural UniversityYa’anP.R.China

The mass production of disposable polyolefin products has led to serious plastic pollution and an imbalance between manufacturing and *** these challenges,the chemical upcycling of waste polyolefins has attracted extensive attention due to its high efficiency and economic ***,we review the development of polyolefin chemical upcycling in heterogeneous *** status quo of polyolefin recycling is first *** then introduce the advanced strategies for chemical upcycling in the view of different value-added products and discuss their challenges and *** in-depth analysis centers on the catalytic mechanism and the design principle of heterogeneous cata***,we outlook the promising directions to facilitate the degradation process via polymer and catalyst design and optimized catalytic *** strategies are expected to promote the chemical upcycling of polyolefins,bringing great promise for the sustainable development of society.

关键词： chemical upcycling heterogeneous catalysis plastic recovery polyolefin value-added products

Boosting lithium storage performance of Si nanoparticles via thin carbon and nitrogen/phosphorus co-doped two-dimensional carbon sheet dual encapsulation

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Rare Metals 2021年第6期40卷 1347-1356页

作者： Cheng-Zhi Ke Fang Liu Zhi-Ming Zheng He-He zhang Meng-Ting Cai Miao Li Qi-zhang Yan Hui-Xin Chen qiao-Bao zhang Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamen 361005China Department of Nanoengineering University of California San DiegoLa JollaCA 92093USA Xiamen Institute of Rare Earth Materials Haixi InstitutesChinese Academy of SciencesXiamen 361021China

Silicon(Si)is a promising anode candidate for next-generation lithium-ion batteries(LIBs),but it suffers from poor electronic conductivity and dramatic volume variation during cycling,which poses a critical challenge for stable battery *** mitigate these issues simultaneously,we propose a"double carbon synergistic encapsulation"strategy,namely thin carbon shell and nitrogen/phosphorus co-doped two-dimensional(2D)carbon sheet dual encapsulate Si nanoparticles(denoted as 2D NPC/C@Si).This double carbon structure can serve as a conductive medium and buffer matrix to accommodate the volume expansion of Si nanoparticles and enable fast electron/ion transport,which promotes the formation of a stable solid electrolyte interphase film during *** structural advantages,the resulting 2 D NPC/C@Si electrode demonstrates a high reversible capacity of592 mAh·g^(-1) at 0.2 A·g^(-1) with 90.5%excellent capacity retention after 100 cycles,outstanding rate capability(148 mAh·g^(-1) at 8 A·g^(-1)),and superior long-term cycling stability(326 mAh·g^(-1) at 1 A·g^(-1) for 500 cycles,86%capacity retention).Our findings elucidate the development of high-performance Si@C composite anodes for advanced LTBs.

关键词： Silicon@carbon composites Anode Nitrogen/phosphorus co-doped carbon Lithium-ion battery

Experimental study on a -60 °C cascade refrigerator with dual running mode

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第5期13卷 375-381页

作者： Xiu-fang LIU Jiong-hui LIU Hong-li ZHAO qiao-yu zhang Juan-li MA Institute of Refrigeration and Cryogenic Engineering Xi'an Jiaotong University Xi 'an 710049 China School of Mechanical and Power Engineering Henan Polytechnic University Jiaozuo 454000 China

In this study,an experimental setup is designed and built to investigate the feasibility and performance of the proposed dual-mode cascade refrigeration *** apparatus can be operated in two modes:dual-stage mode and single-stage mode such that the low temperature cycle(LTC) can be operated together with the high temperature cycle(HTC) or can run *** results validate the feasibility of independent operation of *** performance of the independent operation of LTC mode is theoretically investigated using experimental data as *** suggestions are made for the improvement of the coefficient of performance(COP) of the experimental ***,high COP of the cycle provides excellent application for the presented refrigeration cycle.

关键词： Cascade refrigeration Dual-mode Regenerator Optimization Effectiveness

Two-dimensional pipe leakage through a line crack in water distribution systems

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第5期14卷 371-376页

作者： Shuai GUO Tu-qiao zhang Wei-yun SHAO David Z.ZHU Yuan-yu DUAN College of Civil Engineering and Architecture Zhejiang University Deptment of Civil and Environmental Engineering University of AlbertaEdmontonABT6G 2W2Canada

In water distribution systems,water leakage from cracked water pipes is a major concern for water ***,the relationship between the leakage rate and the water pressure can be modeled by a power function developed from the orifice *** paper presents an approximate solution for the computation of the steady-state leakage rate through a longitudinal line crack of a water distribution pipe considering the surrounding soil *** derived solution agrees well with results of numerical *** with the traditional models,the new solution allows assessment of all the parameters that related with leakage including the pressure head inside the pipe,hydraulic conductivity,crack size and its position,and pipe size and its depth.

关键词： Leakage Pipe crack Soil Water distribution systems Water pipes

Three-dimensional numerical simulation of flow and splash behavior in an oxygen coal combustion melting and separating furnace

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Journal of Iron and Steel Research International 2021年第8期28卷 965-977页

作者： Kai Zhao Yao-zong Shen Zheng Kong qiao-rong zhang Yu-zhu zhang Yan Shi Chang-liang Zhen Xue-feng Shi Xing-hua zhang College of Metallurgy and Energy North China University of Science and TechnologyTangshan 063210HebeiChina

The change of bubbles and the position of the tuyere in an oxygen coal combustion melting and separating furnace affect the flow and splash behavior of the molten *** analyze this problem further,a three-dimensional numerical simulation method was used to explore the behavior and change of the flow field inside the molten pool during double-row tuyere *** addition,the arrangement of the tuyere was changed for a more detailed understanding of the internal phase distribution and splashing in a molten *** results indicated that under three-dimensional numerical simulation conditions,bubbles rise after leaving the tuyere and break on the surface of the molten pool,which results in certain fluctuations in the nearby *** the injection process of the tuyere,the meteorological accumulation in the middle part of the molten pool formed part of the foam slag because of the influence of surface *** the layout of the upper and lower exhaust tuyeres was changed from staggered to symmetrical,or when the spacing of the upper and lower exhaust tuyeres changed,it had an effect on the phase distribution and splash behavior.

关键词： Oxygen coal combustion melting and separating furnace Exhaust tuyere Phase distribution Splash Numerical simulation

Intermetallic PtBi core/ultrathin Pt shell nanoplates for efficient and I stable methanol and ethanol electro-oxidization

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Nano Research 2019年第2期12卷 429-436页

作者： Xiaolei Yuan Xiaojing Jiang Muhan Cao Lei Chen Kaiqi Nie Yong zhang Yong Xu Xuhui Sun Yanguang Li qiao zhang Institute of Functional Nano and Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices SWC for I Synchrotron Radiation Research Soochow University 199 Renai Road Suzhou 215123 China

The development of Pt-based core/shell nanoparticles represents an emerging class of electrocatalysts for fuel cells, such as methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR). Here, we present a one-pot synthesis approach to prepare hexagonal PtBi/Pt core/shell nan ostructure composed of an in termetallic PtiBii core and an ultrathi n Pt shell with well-defined shape, size, and *** structure and the synergistic effect among different components enhanced their MOR and EOR performanee. The optimized Pt2Bi nanoplates exhibit excellent mass activities in both MOR (4,820 mA·mgpt^-1) and EOR (5,950 mA·mgpt^1) conducted in alkaline media, which are 6.15 times and 8.63 times higher than those of commercial Pt/C, respectively. Pt2Bi nan opiates also show superior operati on durability to commercial Pt/C. This work may inspire the rational design and synthesis of Pt-based nanoparticles with improved performance for fuel cells and other applications.

关键词： intermetallics nanoplates core-shell structure methanol oxidation reaction ethanol oxidation reaction

Effects of repetitive transcranial magnetic stimulation on cognitive function and cholinergic activity in the rat hippocampus after vascular dementia

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Neural Regeneration Research 2018年第8期13卷 1384-1389页

作者： Xiao-qiao zhang Li Li Jiang-Tao Huo Min Cheng Lin-Hong Li Department of General Medicine & Neurology Taihe Hospital Hubei University of Medicine Department of Pharmacy Taihe Hospital Hubei University of Medicine

Repetitive transcranial magnetic stimulation （rTMS） is a non-invasive treatment that can enhance the recovery of neurological function after stroke. Whether it can similarly promote the recovery of cognitive function after vascular dementia remains unknown, In this study, a rat model for vascular dementia was established by the two-vessel occlusion method. Two days after injury, 30 pulses of rTMS were ad- ministered to each cerebral hemisphere at a frequency of 0.5 Hz and a magnetic field intensity of 1,33 T. The Morris water maze test was used to evaluate learning and memory function. The Karnovsky-Roots method was performed to determine the density of cholinergic neurons in the hippocampal CA1 region. Immunohistochemical staining was used to determine the number of brain-derived neurotroph- ic factor （BDNF）-immunoreactive cells in the hippocampal CA1 region, rTMS treatment for 30 days significantly improved learning and memory function, increased acetylcholinesterase and choline acetyltransferase activity, increased the density of cholinergic neurons, and increased the number of BDNF-immunoreactive cells. These results indicate that rTMS can ameliorate learning and memory deficiencies in rats with vascular dementia, The mechanism through which this occurs might be related to the promotion of BDNF expression and subsequent restoration of cholinergic system activity in hippocampal CA 1 region.

关键词： nerve regeneration cholinergic system neurotrophic factor hippocampal CA1 region learning and memory function repetitivetranscranial magnetic stimulation vascular dementia neural regeneration

Neural decoding based on probabilistic neural network

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第4期11卷 298-306页

作者： Yi YU Shao-min zhang Huai-jian zhang Xiao-chun LIU qiao-sheng zhang Xiao-xiang ZHENG Jian-hua DAI Qiushi Academy for Advanced Studies Zhejiang University Hangzhou 310027 China College of Biomedical Engineering and Instrument Science Zhejiang University Hangzhou 31002 7 China Key Laboratory of Biomedical Engineering of Ministry of Education Zhejiang University Hangzhou 310027 China College of Computer Science and Technology Zhejiang University Hangzhou 310027 China

Brain-machine interface (BMI) has been developed due to its possibility to cure severe body paralysis. This technology has been used to realize the direct control of prosthetic devices,such as robot arms,computer cursors,and paralyzed muscles. A variety of neural decoding algorithms have been designed to explore relationships between neural activities and movements of the limbs. In this paper,two novel neural decoding methods based on probabilistic neural network (PNN) in rats were introduced,the PNN decoder and the modified PNN (MPNN) decoder. In the ex-periment,rats were trained to obtain water by pressing a lever over a pressure threshold. Microelectrode array was implanted in the motor cortex to record neural activity,and pressure was recorded by a pressure sensor synchronously. After training,the pressure values were estimated from the neural signals by PNN and MPNN decoders. Their per-formances were evaluated by a correlation coefficient (CC) and a mean square error (MSE). The results show that the MPNN decoder,with a CC of 0.8657 and an MSE of 0.2563,outperformed the traditionally-used Wiener filter (WF) and Kalman filter (KF) decoders. It was also observed that the discretization level did not affect the MPNN performance,indicating that the MPNN decoder can handle different tasks in BMI system,including the detection of movement states and estimation of continuous kinematic parameters.

关键词： Brain-machine interfaces (BMI) Neural decoding Probabilistic neural network (PNN) Microelectrode array

Facile and efficient synthesis of 2-substituted-Nl-carbethoxy-2,3-dihydro-4(1H)-quinazolinones in fluorous solvent

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Chinese Chemical Letters 2008年第5期19卷 537-540页

作者： Bai Ling Xu Jin Ping Chen Rong zhang qiao De Cai Fu lnstitute of Materia Medica Chinese Academy of Medical Sciences Peking Union Medical College Beijing 100050 China Hebei University of Science and Technology Shijiazhuang 050018 China Department of Life Science and Technology Beijing University of Chemical Technology Beijing 100029 China

A facile, efficient and novel approach to access 2-substituted-N1-carbethoxy-2,3-dihydro-4（1H）-quinazolinones was developed by condensation of substituted N-carbethoxyanthranilamide with alkyl, aromatic or heteroaromatic aldehydes in the refluxing 2,2,2- trifluoroethanol or hexafluoroisopropanol using p-toluenesulfonic acid as catalyst.

关键词： Quinazolinones Trifluoroethanol Hexafluoroisopropanol Fluorous solvent Solvent effect