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Livelihood Vulnerability and Adaptation for Households Engaged in Forestry in Ecological Restoration Areas of the Chinese Loess Plateau

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Chinese Geographical Science 2024年第5期34卷 849-868页

作者： yang qingqing CHEN yang LI Xiaomin yang Jie GAO Yanhui Northwest Land and Resources Research Center Global Regional and Urban Research InstituteShaanxi Normal UniversityXi’an 710119China School of Geographical Science and Tourism Shaanxi Normal UniversityXi’an 710119China School of Tourism and Research Institute of Human Geography Xi’an International Studies UniversityXi’an 710128China

Chinese Loess Plateau has achieved a win-win situation concerning ecological restoration and socio-economic ***,synergistic development may not be realized at the local *** areas undergoing ecological restoration,livelihood vulner-ability may be more pronounced due to the inflexibility,policy protection,and susceptibility to climate and market changes in forestry *** this issue has attracted academic interest,empirical studies are relatively *** study,centered on Jiaxian County,Shaanxi Province of China explored the households’livelihood vulnerability and coping strategies and group heterogeneity con-cerned with livelihood structures or forestry resources through field investigation,comprehensive index assessment,and nonparametric *** showed that:1)the percentage of households with high livelihood vulnerability indicator(LVI)(>0.491)reached 46.34%.2)Eight groups in livelihood structures formed by forestry,traditional agriculture,and non-farm activities were significantly different in LVI,land resources(LR),social networks(SN),livelihood strategies(LS),housing characteristics(HC),and socio-demo-graphic profile(SDP).3)The livelihood vulnerability of the groups with highly engaged/reliance on jujube(Ziziphus jujuba)forest demonstrated more prominent livelihood vulnerability due to the increased precipitation and cold market,where the low-engaged with reliance type were significantly more vulnerable in LVI,SDP,LR,and HC.4)The threshold of behavioral triggers widely varied,and farmers dependent on forestry livelihoods showed negative coping ***,the cutting behavior was strongly associated with lagged years and government subsidies,guidance,and high returns of ***,the findings can provide guidance on the dir-ection of livelihood vulnerability mitigation and adaptive government management in ecologically restored *** issue of farmers’livelihood sustainability in the context of ecologi

关键词： livelihood vulnerability forestry coping behaviors climate change market change Jiaxian County

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Advances in green synthesis and applications of graphene

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Nano Research 2021年第11期14卷 3724-3743页

作者： Qi Yu Jianchao Jiang Liyun Jiang qingqing yang Ning Yan Shaanxi Key Laboratory of Catalysis School of Materials Science and EngineeringShaanxi University of TechnologyHanzhong723001China Department of Chemical and Biomolecular Engineering National University of SingaporeSingapore117585Singapore

Green synthesis has grabbed appreciable attention to eliminate the negative effects associated with various chemical processes. Due to the unparalleled electrical, mechanical, thermal and excellent physical properties, graphene, as the thinnest two-dimensional material with high surface area, has the unfathomable potential in the domain of green chemistry in terms of both synthesis and application. In this regard, we present an overview of the research progresses on the greener synthesis of graphene, including micromechanical exfoliation, chemical reduction of graphene oxide (GO), chemical vapor synthesis and popping of GO. Meanwhile, various applications of graphene pertinent to sustainable developments, such as energy storage, catalysis, electrochemistry, fuel cell, supercapacitor and biomedicine have also been highlighted.

关键词： green chemistry graphene synthesis catalysis supercapacitor

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Vector Control Strategy of a T-type Three-level Converter Driving a Switched Reluctance Motor

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Chinese Journal of Electrical Engineering 2019年第4期5卷 15-21页

作者： Mingyao Ma Zhuangzhi Wang qingqing yang Shuying yang Xing Zhang National and Local Joint Engineering Laboratory of Renewable Energy Access to Grid Technology Hefei University of TechnologyHefei 230009China

A novel 12 voltage vector control strategy for switched reluctance motors(SRM)with a T-type three-level converter is proposed in this *** on a causal analysis of torque ripple under the control of conventional six voltage vectors,six new voltage vectors are added for further reduction of torque *** optimized control rule is adopted based on the division method of the 12 new voltage vectors.A zero-voltage vector is used to adjust the duration of the 12 voltage vectors,the time of which is varied at different parts of the vector sectors according to the torque *** addition,the windings are connected in a delta configuration,therefore,the number of connections between the converter and SRM is ***,the results of MATLAB/Simulink and RT-LAB are presented to verify the validity of the proposed scheme.

关键词： Switched reluctance motor(SRM) T-type three-level converter vector control

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Facile synthesis of high electrical conductive CoP via solid-state synthetic routes for supercapacitors

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Journal of Energy Chemistry 2017年第1期26卷 49-55页

作者： Yumei Hu Maocheng Liu qingqing yang Lingbin Kong Long Kang State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050GansuChina School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050GansuChina

Co-P precursor was prepared by a mechanical alloying method and then is controlled to synthesis of CoP phase through an annealing method. The optimal conditions of ball milling and annealing temperature are investigated. The CoP exhibits higher electrical conductivity than graphite and cobalt oxide, showing excellent pseudocapacitive properties due its high electrical conductivity which can result in a fast electron transfer in high rate charge-discharge possess. The as-obtained CoP electrode achieves a high specific capacitance of 447.5 Fig at 1 Aug, and displays an excellent rate capability as well as good cycling stability. Besides, the asymmetric supercapacitor (ASC) based on the CoP as the positive electrode and activated carbon (AC) as the negative electrode was assembled and displayed a high rate capability (60% of the capacitance is retained when the current density increased from 1 Aug to 12 Aug), excellent cycling stability (96.7% of the initial capacitance is retained after 5000 cycles), and a superior specific energy of 19 Wh/kg at a power density of 350.8 W/kg. The results, suggest that the CoP electrode materials have a great potential for developing high-performance electrochemical energy storage devices. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.

关键词： CoP High electrical conductivity Pseudocapacitive properties Asymmetric supercapacitor

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Effects of Thickness on the Electrical Conductivity of Sputtered YSZ Film with Nanocrystalline Columnar Microstructure

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Journal of Wuhan University of Technology(Materials Science) 2018年第6期33卷 1344-1349页

作者： yang qingqing MENG Bin Faculty of Materials Science & Engineering Kunming University of Science & Technology

In order to investigate the effect of the thickness on the electrical conductivity of yttriastabilized zirconia(YSZ) film, the nanocrystalline columnar-structured YSZ film with thickness of 0.67-2.52 μm was prepared by magnetron sputtering through controlling the deposition time. All the sputtered films with different thicknesses consist of the main phase of cubic YSZ as well as a small amount of monoclinic YSZ. The thicker films exhibit a typical columnar grain structure based on the fractured cross-sectional SEM observations. The average diameters of columnar grains increase from about 40 nm to 100 nm with the film thickness from 0.67 μm to 2.52 μm according to TEM analysis. The thinnest YSZ film with 0.67 μm thickness shows the highest apparent electrical conductivity in the four films in 400-800 ℃ due to the contribution from the highly conductive film/substrate interfacial region. On the other hand, the real electrical conductivities of YSZ films increase with film thickness from 0.67 μm to 2.52 μm after eliminating the contribution of the film/substrate interface. The increasing film thickness leads to the grain growth as well as the decrement in the volumetric fraction of the resistive columnar grain boundary and a consequent higher real electrical conductivity.

关键词： YSZ film columnar microstructure magnetron sputtering interface effect space charge effect

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Serotonin enrichment of rice endosperm by metabolic engineering

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The Crop Journal 2023年第6期11卷 1943-1948页

作者： qingqing yang Yan Tan Ying Ye Dongsheng Zhao Qiaoquan Liu Key Laboratory of Crop Genomics and Molecular Breeding of Jiangsu Province/Zhongshan Biological Breeding Laboratory/Key Laboratory of Plant Functional Genomics of the Ministry of Education College of AgricultureYangzhou UniversityYangzhou 225009JiangsuChina Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops/Jiangsu Key Laboratory of Crop Genetics and Physiology Yangzhou UniversityYangzhou 225009JiangsuChina

In animals,serotonin is a neurotransmitter and mood *** plants,serotonin functions in energy acquisition,tissue maintenance,delay of senescence,and response to biotic and abiotic *** this study,we examined the effect of serotonin enrichment of rice endosperm on plant growth,endosperm development,and grain *** do so,TDCs and T5H were selected as targets for serotonin *** of TDC1 or TDC3 increased serotonin accumulation relative to overexpression of T5H in rice *** lines of target genes driven by the Gt1 promoter showed better field performance than those driven by the Ubi *** of T5H showed little effect on plant growth or grain physicochemical *** neuronal cell culture assays,serotonin induced neuroprotective action against *** of rice cultivars with high serotonin content may be beneficial for health and nutrition.

关键词： Rice endosperm Serotonin Metabolic engineering TDCs T5H

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Constructing vertical phase separation of polymer blends via mixed solvents to enhance their photovoltaic performance

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Science China Chemistry 2015年第2期58卷 309-316页

作者： qingqing yang Jiantai Wang Xiaoqin Zhang Jun Zhang Yingying Fu Zhiyuan Xie State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences University of Chinese Academy of Sciences

A polymer blend comprising poly(3-hexylthiophene)(P3HT)donor and poly[2,7-(9,9′-octyl-fluorene)-alt-5,5-(4′,7′-di-2-thienyl-5′,6′-bis(hexyloxy)-2′,1′,3′-benzothiadiazole)](PFDTBT-OC6)acceptor is used as the active layer to fabricate all-polymer solar *** blend morphology variance processed with pure and mixed solvents,and the related photovoltaic performance,are investigated in *** is found that,due to its low surface energy,a thin P3HT enrichment layer on the top surface of the active layer greatly increases bimolecular recombination and results in S-kinks of the illuminated current density-voltage *** the incorporation of p-xylene(a marginal solvent of P3HT)in the blend solution,the P3HT enrichment atop the active layer surface is effectively decreased because the high boiling-point p-xylene suppresses the diffusion of P3HT chains toward the top surface during the film-drying *** bimolecular recombination was thus improved and the S-kinks of the photovoltaic curves were completely *** overall power conversion efficiencies of the devices are strongly boosted(from 0.88%to 1.41%)when chlorobenzene:p-xylene mixed solvent is used to replace pure chlorobenzene.

关键词： polymer solar cells polymer blends vertical phase separation bimolecular recombination S-kink

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Intelligent fault detection and location scheme for modular multi‐level converter multi‐terminal high‐voltage direct current

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High Voltage 2021年第1期6卷 125-137页

作者： qingqing yang Jianwei Li Ricardo Santos Kaijia Huang Petar Igic Coventry University CoventryUK Department of Engineering Science University of OxfordOxfordUK Centre of Engineering Federal University of ABCSanto AndreBrazil DTU Energy Technical University of DenmarkKongens LyngbyDenmark

In order to overcome the drawbacks of the conventional protection methods in high‐voltage direct current transmission lines, a deep learning approach is proposed that directly learn the fault conditions based on unsupervised feature extraction to the detection and location decision by leveraging the hidden layer activations of recurrent neural network. The deep‐recurrent neural network boosting with the gated recurrent unit compared with the long short‐term memory unit is used by analysing both the signal presented in time domain and frequency domain. The proposed method is tested based on a modular multilevel converter based four‐terminal high‐voltage direct current system. Various faults under different conditions were simulated against fault resistance, external faults and small disturbance immunity with the validity, and the simulation verified a high accuracy, robustness and fast results because of the utilization of characteristic feature extraction.

关键词： fault overcome high

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Facile synthesis of MoS_2/graphite intercalated composite with enhanced electrochemical performance for sodium ion battery

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Journal of Energy Chemistry 2018年第4期27卷 1208-1213页

作者： qingqing yang Maocheng Liu Yumei Hu Yan Xu Lingbin Kong Long Kang State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology School of Materials Science and Engineering Lanzhou University of Technology

MoS2 is a promising anode material for sodium ion batteries owing to its two-dimensional layered structure and high specific capacity. But it still exhibits a poor cycle stability and limited rate capability for Na＋ storage because of its poor electrical conductivity and structural instability. In this work, MoS2/graphite composite is fabricated by mechanically delaminated and restacked MoS2 and graphite to form two-dimensional composite layers. The graphite sheets will improve electrical conductivity and prevent the aggregation as well as structure collapse of the MoS2 layers during charge-discharge process. The MoS2/graphite composite exhibits excellent Na＋ storage properties. It delivers a high discharge specific capacity of 358.2 mAh/g at a current density of 100 mA]g in the first discharge process and with capacity retention of 68.1% after 800 cycles （retains 244 mAh/g）. The average discharge specific capacities retain 250.9 and 225.4 mAh/g corresponding to the current densities of 100 and 1000 mA]g, showing excellent rate capability. The improved electrochemical performance is attributed to the improved electrical conductivity and structural stability after composition of graphite sheets. The study demonstrates a new research strategy for improving sodium ion storage properties of Mo52.

关键词： Sodium ion batteries Transition metal disulfides MoS2/graphite Anode materials

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Magic-sized CdSe nanoclusters for efficient visible-light-driven hydrogen evolution

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Nano Research 2022年第4期15卷 3106-3113页

作者： Ping Wang qingqing yang Chen Xu Bo Wang Huan Wang Jidong Zhang Yongdong Jin State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences5625 Renmin StreetChangchun 130022China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences5625 Renmin StreetChangchun 130022China University of Science and Technology of China No.96JinZhai RoadHefei 230026China School of Materials Science and Engineering Jilin Jianzhu University5088 Xincheng StreetChangchun 130118China

Semiconductor magic-sized nanoclusters have got tremendous interests owing to their distinct chemical and photophysical properties,however,researches concerning their applications are still quite ***,we employ magic-sized CdSe nanoclusters as the light absorber for hydrogen photogeneration,which exhibits much better photocatalytic performance as compared to other conventional semiconductor quantum dots,such as CdS,CdSe,CdS/CdSe,and CdSe/CdS under identical *** lifetime and transient absorption studies indicated that the superior activity is mainly ascribed to the longer exciton lifetime and fast electron transfer from nanoclusters to ***,the issue of instability during reaction could be significantly inhibited by anchoring Zn2+onto the surface of nanoclusters,which gives the average efficacy of hydrogen evolution at 0.61±0.07 mL·h^(-1)·mgcatalyst^(-1),i.e.,27.3±2.9 mmol·h^(-1)·g_(catalyst)^(-1)(420 nm)with maintained 95.2%of original activity over 12 h illumination.

关键词： magic-sized nanoclusters CdSe photocatalysis hydrogen

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