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| 1 | Extraction and analysis of abandoned farmland:A case study of Qingyun and Wudi counties in Shandong Province显示文摘Rapid urbanization and continuous loss of rural labor force has resulted in aba donme nt of large areas of farmland in some regi ons of China.Remote sen sing tech no logy can in directly help detect abandoned farmland size and qua ntity,which is of great significance for farmland protection and food security.This study took Qingyun and Wudi counties in Shandong Province as a study area and used CART decision tree classification to compile land use maps of 1990-2017 based on Landsat and HJ-1A data.We developed rules to identify aba ndoned farmla nd,and explored its spatial distributi on,du rati on,and reclamation.CART accuracy exceeded 85%from 1990-2017.The maximum abandoned farmland area was 5503.86 ha during 1992-2017,with the maximum rate being 5.37%.Farmland abandonment rate was the highest during 1996-1998,and abandonment trend decreased year by year after 2006.Maximum abandonment duration was 15 years(1992-2017),mostly within 4 years and only a few exceeded 10 years.From 1993-2017,the maximum reclaimed aban?doned farmland was 2022.3 ha,and the minimum^20 ha.The maximum reclamation rate was 67.44%m,with annual average rate being 31.83%.This study will help analyze farmland aband onment drivi ng forces in the study area and also provide ref ere nces to ide ntify abandoned farmland in other areas. | XIAO Guofeng ZHU Xiufang HOU Chenyao XIA Xingsheng | 2019 | Journal of Geographical Sciences2019，29，4： | 3 |
| 2 | Rapid Urbanization Induced Extensive Forest Loss to Urban Land in the Guangdong-Hong Kong-Macao Greater Bay Area, China显示文摘China has experienced rapid urbanizations with dramatic land cover changes since 1978. Forest loss is one of land cover changes, and it induces various eco-environmental degradation issues. As one of China’s hotspot regions, the Guangdong-Hong KongMacao Greater Bay Area(GBA) has undergone a dramatic urban expansion. To better understand forest dynamics and protect forest ecosystem, revealing the processes, patterns and underlying drivers of forest loss is essential. This study focused on the spatiotemporal evolution and potential driving factors of forest loss in the GBA at regional and city level. The Landsat time-series images from 1987 to2017 were used to derive forest, and landscape metrics and geographic information system(GIS) were applied to implement further spatial analysis. The results showed that: 1) 14.86% of the total urban growth area of the GBA was obtained from the forest loss in1987–2017;meanwhile, the forest loss area of the GBA reached 4040.6 km2, of which 25.60%(1034.42 km2) was converted to urban land;2) the percentages of forest loss to urban land in Dongguan(19.14%), Guangzhou(18.35%) and Shenzhen(15.81%) were higher than those in other cities;3) the forest became increasingly fragmented from 1987–2007, and then the fragmentation decreased from2007 to 2017);4) the landscape responses to forest changes varied with the scale;and 5) some forest loss to urban regions moved from low-elevation and gentle-slope terrains to higher-elevation and steep-slope terrains over time, especially in Shenzhen and Hong Kong.Urbanization and industrialization greatly drove forest loss and fragmentation, and, notably, hillside urban land expansion may have contributed to hillside forest loss. The findings will help policy makers in maintaining the stability of forest ecosystems, and provide some new insights into forest management and conservation. | YANG Chao LIU Huizeng LI Qingquan CUI Aihong XIA Rongling SHI Tiezhu ZHANG Jie GAO Wenxiu ZHOU Xiang WU Guofeng | 2021 | Chinese Geographical Science2021，31，1： | 3 |
| 3 | Li2FeSiO4/C hollow nanospheres as cathode materials for lithium-ion batteries显示文摘Undoubtedly, it is imperative to figure out two stubborn issues concerning low electronic conductivity and sluggish lithium ion diffusion to promote the practical application of Li2FeSiO4 materials in lithium-ion battery (LIB) cathode. Herein, we report an innovative and simple strategy that combines a hydrothermal process with subsequent annealing to synthesize highly uniform Li2FeSiO/C hollow nanospheres. During the hydrothermal process, polystyrenen anospheres are employed not only as the template but also, more tactfully, as carb on source to form amorphous carbon layers, which will function to enhance the electronic conductivity and restrict particle aggregations. The use of the LIB Li2FeSiO4/C hollow nano spheres as a LIB cathode delivers a desired stable capacity at each rate stage, and eve n at a high rate of 10 C, the hollow nano sphere cathode can prese nt a specific discharge capacity as high as 50.5 mAh·g^-1. After 100 cycles, the capacity rete ntions at 1 and 10 C remain as high as 93% and 72%, respectively. The superior electrochemical performance is believed to be related to special architectures of the Li2FeSiO4/C hollow nano sphere cathode. | Shuiyun Shen Yao Zhang Guanghua Wei Wansen Zhang Xiaohui Yan Guofeng Xia Aiming Wu Changchun Ke Junliang Zhang | 2019 | Nano Research2019，12，2： | 3 |
| 4 | Hydrogen-assisted scalable preparation of ultrathin Pt shells onto surfactant-free and uniform Pd nanoparticles for highly efficient oxygen reduction reaction in practical fuel cells显示文摘Concentrating active Pt atoms in the outer layers of electrocatalysts is a very effective approach to greatly reduce the Pt loading without compromising the electrocatalytic performance and the total electrochemically active surface area(ECSA)for the oxygen reduction reaction(ORR)in hydrogen-based proton-exchange membrane fuel cells.Accordingly,a facile,low-cost,and hydrogen-assisted two-step method is developed in this work,to massively prepare carbon-supported uniform,small-sized,and surfactant-free Pd nanoparticles(NPs)with ultrathin~3-atomic-layer Pt shells(Pd@Pt_(3L) NPs/C).Comprehensive physicochemical characterizations,electrochemical analyses,fuel cell tests,and density functional theory calculations reveal that,benefiting from the ultrathin Pt-shell nanostructure as well as the resulting ligand and geometric effects,Pd@Pt_(3L) NPs/C exhibits not only significantly enhanced ECSA,electrocatalytic activity,and noble-metal(NM)utilization compared to commercial Pt/C,showing 81.24 m^(2)/gPt,0.710 mA/cm^(2),and 352/577 mA/mgNM/Pt in ECSA,area-,and NM-/Pt-mass-specific activity,respectively;but also a much better electrochemical stability during the 10,000-cycle accelerated degradation test.More importantly,the corresponding 25-cm^(2) H2-air/O_(2) fuel cell with the low cathodic Pt loading of~0.152 mgPt/cm^(2)geo achieves the high power density of 0.962/1.261 W/cm^(2)geo at the current density of only 1,600 mA/cm^(2)geo,which is much higher than that for the commercial Pt/C.This work not only develops a high-performance and practical Pt-based ORR electrocatalyst,but also provides a scalable preparation method for fabricating the ultrathin Pt-shell nanostructure,which can be further expanded to other metal shells for other energy-conversion applications. | Liuxuan Luo Cehuang Fu Aiming Wu Zechao Zhuang Fengjuan Zhu Fangling Jiang Shuiyun Shen Xiyang Cai Qi Kang Zhifeng Zheng Chenyi Hu Jiewei Yin Guofeng Xia Junliang Zhang | 2022 | Nano Research2022，15，3： | 2 |
| 5 | Quantitative proteomic analysis of host responses triggered by Mycobacterium tuberculosis infection in human macrophage cells显示文摘 | Hua Li Sha Wei Yuan Fang Min Li Xia Li Zhe Li Jibin Zhang Guofeng Zhu Chuanyou Li Lijun Bi Guimin Zhang Dianbing Wang Xian-En Zhang | 2017 | Acta Biochimica et Biophysica Sinica2017，49，9： | 1 |
| 6 | Response of benthic algae to environmental conditions in an urban lake recovered from eutrophication, China显示文摘Benthic algae communities dominate the primary production in littoral zone of shallow lake.To tmderstand the long-term effect of alteration in the composition of benthic algae community assemblage in such as a lake in China,we analyzed the benthic algae developments and indicators in the Donghu Lake in Wuhan,central China in 2004 and 2014.We compared the benthic algae biomass,compositions,and species richness of aquatic macrophytes and the changes of primary physicochemical parameters.The results show that in the 10-year period,chl a and conductivity declined significantly but nutrient level of the whole lake remained largely stable.The benthic algae biomass doubled and the relative proportion of green algae increased,whereas the benthic diatom ratio decreased.The benthic diatom assemblages and taxa differed in a number of ways,showing more epiphytic diatom species,and the relative abundance and species richness changed markedly.The number of aquatic macrophyte species increased from 3 in 2004 to 15 in 2014,presenting a remarkable recovery from previous eutrophication conditions.The changes of water level,chl a,and conductivity played a crucial role in governing aquatic macrophytes re-colonization in the littoral zones in the period.The ecological characteristics of littoral benthic diatoms reflect habitat coupling as indicated by redundancy analysis.Therefore,the close link between benthic algae and macrophyte recovery demonstrates that the benthic algae metrics are much more useful than nutrient levels to quantify the process of restoration in the lake. | WANG Tao WANG Qing XIA Shuang YAN Chunlan PEI Guofeng | 2020 | Journal of Oceanology and Limnology2020，38，1： | 1 |
| 7 | TAZ Is Highly Expressed in Gastric Signet Ring Cell Carcinoma显示文摘 | Guofeng Yue Xia Sun Ana Gimenez-Capitan Jie Shen Lixia Yu Cristina Teixido Wenxian Guan Rafael Rosell Baorui Liu Jia Wei Koichi Handa | 2014 | BioMed Research International2014，，： | 1 |
| 8 | Lithium-ion modified cellulose as a water-soluble binder for Li-O2 battery显示文摘An environment-friendly,water-soluble,and cellulose based binder(lithium carboxymethyl cellulose,CMC-Li)was successfully synthesized by using Li+to replace Na+in the commercial sodium carboxymethyl cellulose(CMC-Na).Li-O2 batteries based on the CMC-Li binder present enhanced discharge specific capacities(11151 mAh/g at 100 mA/g)and a superior cycling stability(100 cycles at 200 mA/g)compared with those based on the CMC-Na binder.The enhanced performance may originate from the electrochemical stability of the CMC-Li binder and the ion-conductive nature of CMC-Li,which promotes the diffusion of Li+in the cathode and consequently retards the increase of charge transfer resistance of the cathode during cycling.The results show that the water-soluble CMC-Li binder can be a green substitute for poly(vinylidene fluoride)(PVDF)binder based on organic solvent in the lithium oxygen batteries(LOBs). | Chenyi Hu Aiming Wu Fengjuan Zhu Liuxuan Luo Fan Yang Guofeng Xia Guanghua Wei Shuiyun Shen Junliang Zhang | 2022 | Frontiers in Energy2022，16，3： | 0 |
| 9 | Theoretical Analysis and Experimental Research of Surface Texture Hydrodynamic Lubrication显示文摘The research on surface texture is developing from single macro-texture to composite micro-nano texture.The current research on the anti-friction mechanism and theoretical models of textures is relatively weak.Studying the characteristics of different types of surface textures and determining the applicable working conditions of each texture is the focus of current research.In this paper,a mathematical model of hydrodynamic lubrication is established based on Navier-Stokes equations.The FLUENT software is used to simulate and analyze the four texture models,explore the dynamic pressure lubrication characteristics of different texture types,and provide data support for texture optimization.The key variable values required by the mathematical model are obtained through the simulation data.The friction coefficient of the texture under different working conditions was measured through friction and wear experiments,and the mathematical model was verified by the experimental results.The research results show that circular texture is suitable for low to medium speed and high load conditions,chevron texture is suitable for medium to high speed and medium to high load conditions,groove texture is suitable for high speed and low load conditions,and composite texture is suitable for high speed and medium to high load conditions.Comparing the experimental results with the results obtained by the mathematical model,it is found that the two are basically the same in the ranking of the anti-friction performance of different textures,and there is an error of 10%−40%in the friction coefficient value.In this study,a mathematical model of hydrodynamic lubrication was proposed,and the solution method of the optimal surface texture model was determined. | Dan Li Xuefeng Yang Yuanbo Wu Jian Cheng Shouren Wang Zhuang Wan Wenbo Liu Guofeng Xia | 2022 | Chinese Journal of Mechanical Engineering2022，35，2： | 0 |
| 10 | Facile controlled synthesis of hierarchically structured mesoporous Li_(4)Ti_(5)O_(12)/C/rGO composites as high-performance anode of lithium-ion batteries显示文摘t In this paper,a facile strategy is proposed to controllably synthesize mesoporous Li_(4)Ti_(5)O_(12)/C nanocomposite embedded in graphene matrix as lithium-ion battery anode via the co-assembly of Li_(4)Ti_(5)O_(12)(LTO)precursor,GO,and phenolic resin.The obtained composites,which consists of a LTO core,a phenolic-resin-based carbon shell,and a porous frame constructed by rGO,can be denoted as LTO/C/rGO and presents a hierarchical structure.Owing to the advantages of the hierarchical structure,including a high surface area and a high electric conductivity,the mesoporous LTO/C/rGO composite exhibits a greatly improved rate capability as the anode material in contrast to the conventional LTO electrode. | Cehuang FU Shuiyun SHEN Ruofei WU Xiaohui YAN Guofeng XIA Junliang ZHANG | 2022 | Frontiers in Energy2022，16，4： | 0 |
| 11 | A flat-based plasmonic fiber probe for nanoimaging显示文摘The difficulty of obtaining high-intensity localized light spots for optical probes leads to their lack of good applications in nanoimaging.Here we demonstrate a Fabry–Pérot resonance flat-based plasmonic fiber probe(FPFP).The simulation results show that the probe can obtain a nanofocusing spot at the tip with the radially polarized mode.The Fabry–Pérot interference structure is used to control the plasmon propagation on the surface of the probe,it effectively improves the local spot intensity at the tip.Furthermore,the experimental results verify that the FPFP(tip curvature radius is 20 nm)prepared by chemical etching method can obtain a nanofocusing spot at the tip.The nanoimaging of the gold slit structure demonstrates the nanoimaging capability of the FPFP,the 36.9 nm slit width is clearly identified by the FPFP. | Fei Wang Shaobo Li Shuhao Zhao Ze Zhang Peirui Ji Chengsheng Xia Biyao Cheng Guofeng Zhang Shuming Yang | 2023 | Nano Research2023，16，5： | 0 |
| 12 | Facile preparation of unique three-dimensional(3D)α-MnCh/MWCNTs macroporous hybrid as the high-performance cathode of rechargeable Li-O2 batteries显示文摘Un doubtedly,there remai ns an urge nt prerequisite to achieve sign ifica nt adva nces in both the specific capacity and cyclability of Li-O2 batteries for their practical application.In this work,a series of unique three-dimensional(3D)α-MnO2/MWCNTs hybrids are successfully prepared using a facile lyophilization method and investigated as the cathode of Li-O2 batteries.Thereinto,cross-1 inkedα-MnO2/MWCNTs nano composites are first syn thesized via a modified chemical route.Results dem on strate that MnO2 nano rods in the nano composites have a length of 100-400 nm and a diameter ranging from 5 to 10 nm,and more attractively,the as-lyophilized 3D MnO2/MWCNTs hybrids is uniquely constructed with large amounts of interconnected macroporous channels.The U-O2 battery with the 3D macroporous hybrid cathode that has a mass percentage of 50%ofα-MnO2 delivers a high discharge specific capacity of 8,643 mAh·g^-1 at 100 mA·g^-1,and main tains over 90 cycles before the discharge voltage drops to 2.0 V un der a controlled specific capacity of 1,000 mAh·g^-1.It is observed that when being recharged,the product of toroidal Li2O2 particles disappears and electrode surfaces are well recovered,thus confirming a good reversibility.The excellent performanee of Li-O2 battery with the 3Dα-MnO2/MWCNTs macroporous hybrid cathode is ascribed to a syn ergistic com bination betwee n the unique macroporous architecture and highly efficient bi-fun ctionalα-MnO2/MWCNTs electrocatalyst. | Shuiyun Shen Aiming Wu Guofeng Xia Guanghua Wei Xiaohui Yan Yao Zhang Fengjuan Zhu Jiewei Yin Junliang Zhang | 2019 | Nano Research2019，12，1： | 0 |
| 13 | Polarization-insensitive plasmon nanofocusing with broadband interference modulation for optical nanoimaging显示文摘Delivering light to the nanoscale using a flexible and easily integrated fiber platform holds potential in various fields of quantum science and bioscience.However,rigorous optical alignment,sophisticated fabrication process,and low spatial resolution of the fiber-based nanoconcentrators limit the practical applications.Here,a broadband azimuthal plasmon interference nanofocusing technique on a fiber-coupled spiral tip is demonstrated for fiber-based near-field optical nanoimaging.The spiral plasmonic fiber tip fabricated through a robust and reproducible process can reverse the polarization and modulate the mode field of the surface plasmon polaritons in three-dimensionally azimuthal direction,resulting in polarization-insensitive,broad-bandwidth,and azimuthal interference nanofocusing.By integrating this with a basic scanning near-field optical microscopy,a high optical resolution of 31 nm and beyond is realized.The high performance and the easy incorporation with various existing measurement platforms offered by this fiber-based nanofocusing technique have great potential in near-field optics,tip-enhanced Raman spectroscopy,nonlinear spectroscopy,and quantum sensing. | Shaobo Li Fei Wang Ze Zhang Shuhao Zhao Chengsheng Xia Peirui Ji Xiaomin Wang Guofeng Zhang Tao Liu Feng Chen Shuming Yang | 2023 | Nano Research2023，16，7： | 0 |
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