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Mapping upland crop–rice cropping systems for targeted sustainable intensification in South China

The Crop Journal 2024年第2期12卷 614-629页

作者： Bingwen Qiu Linhai Yu Peng Yang Wenbin Wu Jianfeng Chen xiaolin zhu Mingjie Duan Key Laboratory of Spatial Data Mining&Information Sharing of Ministry of Education Academy of Digital China(Fujian)Fuzhou UniversityFuzhou 350116FujianChina Key Laboratory of Agricultural Remote Sensing Ministry of Agriculture and Rural AffairsBeijing 100081China Department of Land Surveying and Geo-Informatics The Hong Kong Polytechnic UniversityKowloon 999077Hong KongChina

Upland crop-rice cropping systems(UCR)facilitate sustainable agricultural intensification.Accurate UCR cultivation mapping is needed to ensure food security,sustainable water management,and rural revitalization.However,datasets describing cropping systems are limited in spatial coverage and crop types.Mapping UCR is more challenging than crop identification and most existing approaches rely heavily on accurate phenology calendars and representative training samples,which limits its applications over large regions.We describe a novel algorithm(RRSS)for automatic mapping of upland crop-rice cropping systems using Sentinel-1 Synthetic Aperture Radar(SAR)and Sentinel-2 Multispectral Instrument(MSI)data.One indicator,the VV backscatter range,was proposed to discriminate UCR and another two indicators were designed by coupling greenness and pigment indices to further discriminate tobacco or oilseed UCR.The RRSS algorithm was applied to South China characterized by complex smallholder rice cropping systems and diverse topographic conditions.This study developed 10-m UCR maps of a major rice bowl in South China,the Xiang-Gan-Min(XGM)region.The performance of the RRSS algorithm was validated based on 5197 ground-truth reference sites,with an overall accuracy of 91.92%.There were7348 km^(2) areas of UCR,roughly one-half of them located in plains.The UCR was represented mainly by oilseed-UCR and tobacco-UCR,which contributed respectively 69%and 15%of UCR area.UCR patterns accounted for only one-tenth of rice production,which can be tripled by intensification from single rice cropping.Application to complex and fragmented subtropical regions suggested the spatiotemporal robustness of the RRSS algorithm,which could be further applied to generate 10-m UCR datasets for application at national or global scales.

关键词： Cropping-pattern mapping Paddy rice Sentinel-1/2 China Sustainable intensification

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The stabilization effect of Al_(2)O_(3)on unconventional Pb/SiO_(2)catalyst for propane dehydrogenation

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Frontiers of Chemical Science and Engineering 2023年第10期17卷 1423-1429页

作者： Guowei Wang Lanhui Zhou Huanling Zhang Chunlei zhu xiaolin zhu Honghong Shan State Key Laboratory of Heavy Oil Processing China University of PetroleumQingdao 266580China SINOPEC(Dalian)Research Institute of Petroleum and Petrochemical Co. Ltd.Dalian 116000China

Similar to Sn,Pb located at the same group(IVA)in the periodic table of elements,can also catalyze propane dehydrogenation to propene,while a fast deactivation can be observed.To enhance the stability,the traditional carrier Al_(2)O_(3)with a small amount,was introduced into Pb/SiO_(2)catalyst in this study.It has been proved that Al_(2)O_(3)can inhibit the reduction of PbO,and weaken the agglomeration and loss of Pb species due to its enhanced interaction with Pb species.As a result,3Al15Pb/SiO_(2)catalyst exhibits a much higher stability up to more than 150 h.In addition,a simple schematic diagram of the change of surface species on the catalyst surface after Al_(2)O_(3)addition was also proposed.

关键词： Pb/SiO_(2) Al_(2)O_(3) propane dehydrogenation propene stability

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Communication-efficient federated continual learning for distributed learning system with Non-IID data

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Science China(Information Sciences) 2023年第2期66卷 94-113页

作者： Zhao ZHANG Yong ZHANG Da GUO Shuang ZHAO xiaolin zhu School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing Key Laboratory of Work Safety Intelligent Monitoring Beijing University of Posts and Telecommunication

Due to the privacy preserving capabilities and the low communication costs, federated learning has emerged as an efficient technique for distributed deep learning/machine learning training. However, given the typical heterogeneous data distributions in the realistic scenario, federated learning faces the challenge of performance degradation on non-independent identically distributed(Non-IID) data across clients. Therefore, we propose federated continual learning to improve the performance on Non-IID data by introducing the knowledge of the other local models. Specifically, we propose a novel federated continual learning method called Fed SI, adapting the synaptic intelligence method to the federated learning scenario. Furthermore,in order to reduce the communication overheads, we propose the bidirectional compression and error compensation(BCEC) algorithm to produce the communication-efficient federated continual learning method,called CFedSI. Specifically, the proposed BCEC algorithm compresses both the uplink and the downlink transmission data and utilizes the error compensation locally to ensure training divergence. Experiments show that CFedSI improves the accuracy on Non-IID data by up to 46% with KDDCUP’99 dataset, 23%with CICIDS2017 dataset, 22% with MNIST dataset, and 8% with FashionMNIST dataset, along with the reduced communication overheads.

关键词： distributed learning system federated learning continual learning model compression error compensation

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Covalent-architected molybdenum disulfide arrays on Ti_(3)C_(2)T_(x) MXene fiber towards robust capacitive energy storage

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Journal of Materials Science & Technology 2023年第8期139卷 23-30页

作者： Suya Sun xiaolin zhu Xingjiang Wu Meigui Xu Ying Hu Ningzhong Bao Guan Wu State Key Laboratory of Materials Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 210009China National Engineering Lab for Textile Fiber Materials&Processing Technology School of Materials Science and EngineeringZhejiang Sci-Tech UniversityHangzhou 310018China The State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Institute of Industry and Equipment Technology Hefei University of TechnologyHefei 230009China

Ti_(3)C_(2)T_(x)MXene fiber has shown extraordinary potential for supercapacitor electrode in wearable elec-tronics and textile energy storage,but realizing high energy density and practical-powered applications remains a great challenge.Here,we report a covalent-architected molybdenum disulfide-Ti_(3)C_(2)T_(x)(MoS_(2)-Ti_(3)C_(2)T_(x))core-shell fiber for high-performance supercapacitor.Benefiting from the microfluidic and micro-reaction strategies,the ordered MoS_(2)arrays are strongly bridged on Ti_(3)C_(2)T_(x)fiber via Ti-O-Mo bond,re-sulting in large exposed surface,enhanced porosity and excellent interfacial conduction for charges high diffusion and faradaic transfer.The MoS_(2)-Ti_(3)C_(2)T_(x)fiber exhibits ultra-large capacitance of 2028 F cm^(-3)and admirable reversibility in 1 M H_(2)SO_(4)aqueous electrolyte.Meanwhile,MoS_(2)-Ti_(3)C_(2)T_(x)fiber-based solid-state supercapacitor presents high energy density of 23.86 mWh cm^(-3),capacitance of 1073.6 F cm^(-3)and superior cycling ability of 92.13%retention after 20,000 cycles,which can realize stable energy supply for wearable watch,LEDs,electric fans,toy ship and self-powered devices.Our work may provide an insight-ful guidance for the advanced design of structural fiber towards robust new energy and next-generation wearable industry.

关键词： Molybdenum disulfide Ti_(3)C_(2)T_(x)fiber Covalent-architecture Supercapacitors High energy density

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Anthrazoline Photocatalyst for Promoting Esterification and Etherification Reactions via Photoredox/Nickel Dual Catalysis

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Chinese Journal of Chemistry 2023年第4期41卷 411-416页

作者： xiaolin zhu Qiujin Fan Wei Luo Danfeng Wang Yihui Jia Heyang Li Zhen Wang Qi Xiao Xiaoming He Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education School of Chemistry of Chemical EngineeringShaanxi Normal UniversityXi'anShaanxi710119 China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620 China Jiangsu Key Laboratory of Fine Petrochemical Engineering School of Petrochemical EngineeringChangzhou UniversityChangzhouJiangsu213164 China

Here,we demonstrate a readily prepared anthrazoline photocatalyst,which can effectively promote C—O bond formation reactions with the aid of Ni(II)complex.This methodology enables the esterification(36 examples)and etherification(8 examples)with a broad range of scope,allowing aryl and alkyl halides coupled with diverse carboxylic acids/alcohols.Our metal-free photocatalysts have a potential broad application,may serve as an alternative to some iridium and ruthenium based photocatalysts,and are of potential importance to the pharmaceutical industry.

关键词： Anthrazoline Photocatalysis Photoredox Cross-coupling C-O bond formation

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Elucidating the effect of barium halide promoters on La_(2)O_(3)/CaO catalyst for oxidative coupling of methane

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Journal of Energy Chemistry 2022年第10期31卷 49-59,I0003页

作者： Yue Wang Xiao Yang Fumin Yin Kai Zhang Hongfei Guo Guowei Wang Guiyuan Jiang Chunyi Li xiaolin zhu State Key Laboratory of Heavy Oil Processing China University of PetroleumQingdao 266580ShandongChina State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China

The industrialization of oxidative coupling of methane(OCM)is restricted by the low once through yield of C_(2)hydrocarbons.Recently,the halogen-assisted OCM process has been attempted to overcome this issue,but the reaction stability was poor due to the rapid loss of gas-phase halides or molten alkali halides.In this work,the barium salts,particularly barium halides(BaCl_(2)and BaF_(2)),were demonstrated to be efficient promoters to improve the OCM reactivity of La_(2)O_(3)/CaO catalyst by increasing both C_(2)selectivity and C_(2)H_(4)/C_(2)H_(6)ratio,and simultaneously achieving outstanding reaction stability.The promoting mechanism can be understood in two aspects.On the one hand,the introduction of barium salts increased the amount of surface electrophilic oxygen species,serving as the alkaline active sites for selective methane activation.On the other hand,the barium halide additives induced the in-situ formation of methyl halide intermediates facilitating C_(2)H_(6)dehydrogenation,and their intimate contact with catalyst substrate restricted the rapid halogen loss and thereby improved the catalytic stability.This work not only provides a class of efficient OCM catalyst,but also offers a highly stable halogen-assisted reaction strategy.

关键词： Oxidative coupling of methane La_(2)O_(3)/CaO catalyst Barium halide promoters Active oxygen species Methyl halide intermediates

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The influence of the capping ligands on the optoelectronic performance,morphology,and ion liberation of CsPbBr_(3)perovskite quantum dots

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Nano Research 2023年第7期16卷 10626-10633页

作者： Yongfeng Liu Shi Tang Zhaoju Gao Xiuwen Shao xiaolin zhu Joan Ràfols Ribé Thomas Wågberg Ludvig Edman Jia Wang College of Physical Science and Technology Yangzhou UniversityYangzhou 225002China Department of Physics UmeåUniversityUmeåSE-90187Sweden LunaLEC AB UmeåSE-90187Sweden Microelectronics Industry Research Institute Yangzhou UniversityYangzhou 225002China

Perovskite quantum dots(PeQDs)endowed with capping ligands exhibit impressive optoelectronic properties and enable for costefficient solution processing and exciting application opportunities.We synthesize and characterize three different PeQDs with the same cubic CsPbBr_(3)core,but which are distinguished by the ligand composition and density.PeQD-1 features a binary didodecyldimethylammonium bromide(DDAB)and octanoic acid capping ligand system,with a high surface density of 1.53 nm^(-2),whereas PeQD-2 and PeQD-3 are coated by solely DDAB at a gradually lower surface density.We show that PeQD-1 endowed with highest ligand density features the highest dispersibility in toluene of 150 g/L,the highest photoluminescence quantum yield of 95%in dilute solution and 59%in a neat film,and the largest core-to-core spacing in neat thin films.We further establish that ions are released from the core of PeQD-1 when it is exposed to an electric field,although it comprises a dense coating of one capping ligand per four surface core atoms.We finally exploit these combined findings to the development of a light-emitting electrochemical cell(LEC),where the active layer is composed solely of solution-processed pure PeQDs,without additional electrolytes.In this device,the ion release is utilized as an advantage for the electrochemical doping process and efficient emissive operation of the LEC.

关键词： CsPbBr_(3)quantum dots capping ligand ion liberation light-emitting electrochemical cell

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Analysis of antibiotic resistance of Escherichia coli isolated from the Yitong River in North-east China

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Frontiers of Environmental Science & Engineering 2019年第3期13卷 127-135页

作者： Yangyang Yu xiaolin zhu Guanlan Wu Chengzhi Wang Xing Yuan School of Environment Northeast Normal University Changchun 130117 China

The Yitong River is one of the largest secondary tributaries of the Songhua River. The area where the Yitong River flows is densely populated and contains the livestock and poultry breeding areas of northeast China. These areas introduce a high risk of antibiotic contamination. In this study, the concentrations of four types of typical antibiotics including quinolones, tetracyclines, sulfonamides, and trimethoprim were determined by solid phase extraction-high performance liquid chromatography. The antibiotic resistance of Escherichia coli caused by antibiotic pollution was investigated. The concentration of total coliforms in the Yitong River was detected by the plate counting method. The antibiotic resistance of E. coli to quinolones, tetracyclines, sulfonamides, and trimethoprim was analyzed by the Kirby-Bauer method. The results showed that the concentration of total coliforms in the summer was higher than that in the spring. There was a seasonal difference in the resistance rate of E. coli to antibiotics except trimethoprim. The antibiotic resistance to fluoroquinolones was relatively low. The resistance rate to tetracyclines was higher during the summer. Moreover, resistance to several antibiotics was observed in all sections. This study provides basic data for research on pollution characteristics and prevention of antibiotic exposure in rivers.

关键词： Yitong River Coliform bacteria Antibiotic resistance Escherichia coli

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Flow dynamics and contact efficiency in a novel fast-turbulent fluidized bed with ring-feeder internals

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Particuology 2015年第4期13卷 203-211页

作者： Qiang Geng Ping Wang xiaolin zhu Xinghua You Chunyi Li State Key Laboratory of Heavy Oil Processing China University of Petroleum(East China) Sinopec Engineering Incorporation Petrochemical Factory of the Yumen Oil-Field Company PetroChina

The flow dynamics in a novel fast-turbulent fluidized bed （FTFB） with middle-upper expanding structure and two different ring-feeder internals （mixed and vortex ring-feeder） were studied to achieve a reduction in gasoline olefin production, Compared with a conventional circulating fluidized bed, the novel FTFB displayed unique characteristics and advantages. A higher solids holdup and more uniform solids holdup distribution existed in the diameter-expanding region, especially for the FTFB with vortex ring-feeder structure, A probability density distribution analysis indicated that the novel fluidized bed could reduce gas-solids segregation and enhance gas-solids interaction. A constant carbon dioxide tracer system was used to simulate the reactant gas distribution. The gas-solids contact efficiency was defined according to the solid dispersibility and the amount of gas covering the solid surface. Novel FTFB risers, especially those with vortex ring-feeders, have a much higher gas-solids contact efficiency than that of traditional risers.

关键词： Flow dynamics Fast-turbulent fluidized bed Ring-feeder internal Carbon dioxide tracer Gas-solids contact efficiency

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Review on the nanoparticle fluidization science and technology

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Chinese Journal of Chemical Engineering 2016年第1期24卷 9-22页

作者： xiaolin zhu Qiang Zhang Yao Wang Fei Wei Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical Engineering Tsinghua University

Gas fluidization has an ability to turn static particles to fluid-like dense flow, which allows greatly improved heat transfer among porous powders and highly efficient solid processing to become reality. As the rising star of current scientific research, some nanoparticles can also be fluidized in the form of agglomerates, with sizes ranging from tens to hundreds of microns. Herein, we have reviewed the recent progress on nanomaterial agglomeration and their fluidization behavior, the assisted techniques to enhance the fluidization of nanomaterials,including some mechanical measures, external fields and improved gas injections, as well as their effects on solid fluidization and mixing behaviors. Most of these techniques are effective in breaking large agglomerates and promoting particulate fluidization, meanwhile, the solid mixing is intensified under assisted fluidization. The applications of nanofluidization in nanostructured material production and sustainable chemical industry are further presented. In summary, the fluidization science of multidimensional, multicomponent and multifunctional particles, their multi-phase characterization, and the guideline of fluidized bed coupled process are prerequisites for the sustainable development of fluidized bed based materials, energy and chemical industry.

关键词：纳米颗粒流化床技术工业可持续发展纳米材料固体混合综述科学研究

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