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Water utilization of typical plant communities in desert steppe,China

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Journal of Arid Land 2022年第9期14卷 1038-1054页

作者： CHEN juan WANG Xing song Naiping WANG Qixue WU Xudong School of Agriculture Ningxia UniversityYinchuan 750021China Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in northwestern China Yinchuan 750021China Key Laboratory of Restoration and Reconstruction of Degraded Ecosystems in northwestern China of Ministry of Education Yinchuan 750021China School of Ecology and Environment Ningxia UniversityYinchuan 750021China Institute of Desertification Control Ningxia Academy of Agricultural and Forestry SciencesYinchuan 750002China

Water is a limiting factor in the restoration and construction of desert *** plant water sources is necessary to understand soil-plant interactions and species coexistence;however,water sources of major plant communities within the desert steppe of Ningxia Hui Autonomous Region,China remain poorly *** this study,we analyzed the water uptake of plants in four typical communities:Agropyron mongolicum Keng.;Sophora alopecuroids Linn.;Stipa breviflora Griseb.,and Achnatherum splendens(Trin.)Nevski *** isotopesδD andδ^(18)O in the xylem of plant and soil water at different soil depths were *** IsoSource model was used to determine the soil depths from which plants obtained *** showed that *** community obtained water predominantly from 0–20 and 40–80 cm depth,*** community from 0–20 cm depth,*** community from 0–40 cm depth,and *** community from 0–20 and 80–140 cm *** had a wider range of soil depths for water extraction,i.e.,utilizing different water sources depending on habitat,and the plasticity of its water uptake pattern determined its role in different *** source of plants relayed heavily on the distribution of their *** for soil water exists between different plant life forms in the sierozem habitat(***,***,and *** communities),and in the sandy soil habitat(*** community).The use of soil water by *** community is more spatially differentiated,and shrubs and herbs can coexist *** the pattern of extended drought period in the future,sierozem habitat may be more favorable for the formation of a dominant monoculture community type of perennial fibrous *** aeolian sandy soil habitat,*** had a strong competitive advantage,and the growth of shallow-rooted plants was easily suppressed.

关键词： stable isotope water source IsoSource model soil water desert steppe

A Robust and Efficient Compressed Sensing Algorithm for Wideband Acoustic Imaging

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Chinese Journal of Mechanical Engineering 2020年第6期33卷 77-92页

作者： Fangli Ning Zhe Liu Jiahao song Feng Pan Pengcheng Han juan Wei School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an710072China Dongguan Sanhang Military-Civil Integration Innovation Research Institute Dongguan523808China School of Communication Engineering Xidian UniversityXi’an710071China

Wideband acoustic imaging,which combines compressed sensing(CS)and microphone arrays,is widely used for locating acoustic ***,the location results of this method are unstable,and the computational efficiency is *** this work,in order to improve the robustness and reduce the computational cost,a DCS-SOMP-SVD compressed sensing method,which combines the distributed compressed sensing using simultaneously orthogonal matching pursuit(DCS-SOMP)and singular value decomposition(SVD)is *** performance of the DCS-SOMP-SVD is studied through both simulation and *** the simulation,the locating results of the DCS-SOMP-SVD method are compared with the wideband BP method and the DCS-SOMP *** terms of computational efficiency,the proposed method is as efficient as the DCS-SOMP method and more efficient than the wideband BP *** terms of locating accuracy,the proposed method can still locate all sources when the signal to noise ratio(SNR)is−20 dB,while the wideband BP method and the DCS-SOMP method can only locate all sources when the SNR is higher than 0 *** performance of the proposed method can be improved by expanding the frequency ***,there is no extra source in the maps of the proposed method,even though the target sparsity is ***,a gas leak experiment is conducted to verify the feasibility of the DCS-SOMP-SVD method in the practical engineering *** experimental results show that the proposed method can locate both two leak sources in different frequency *** research proposes a DCS-SOMP-SVD method which has sufficient robustness and low computational cost for wideband acoustic imaging.

关键词： Wideband acoustic imaging Compressed sensing Singular value decomposition Microphone array Gas leakage

Multi-channel EEG-based emotion recognition in the presence of noisy labels

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Science China(Information Sciences) 2022年第4期65卷 64-79页

作者： Chang LI Yimeng HOU Rencheng song juan CHENG Yu LIU Xun CHEN Department of Biomedical Engineering Hefei University of Technology USTC IAT-Huami Joint Laboratory for Brain-Machine Intelligence Institute of Advanced TechnologyUniversity of Science and Technology of China Anhui Province Key Laboratory of Measuring Theory and Precision Instrument Hefei University of Technology Epilepsy Center Department of Neurosurgery The First Affiliated Hospital of USTC Division of Life Sciences and Medicine University of Science and Technology of China School of Information Science and Technology University of Science and Technology of China (USTC)

A large number of deep learning classification methods for emotion recognition tasks based on electroencephalogram(EEG) have achieved excellent performance, and it is implicitly assumed that all labels are correct. However, humans have natural bias, subjectiveness, and inconsistencies in their judgment, which would lead to noisy labels for the EEG emotion state. To this end, we propose a framework for multi-channel EEG-based emotion recognition in the presence of noisy labels. The proposed noisy labels classification method is based on the capsule network using a joint optimization strategy(JO-Caps Net) until ***, the network parameters are updated based on the loss function of the capsule network, and the pseudo label is updated by predicting the existence possibility of the class label based on the output of the capsule network. In this way, the alternate updating strategy can promote each other to correct the noisy labels. Experimental results demonstrate the advantage of our method.

关键词： electroencephalogram (EEG) emotion recognition noisy labels capsule network joint optimization

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Antioxidant activity of bovine serum albumin binding amino acid Schiff-bases metal complexes

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Chinese Chemical Letters 2007年第11期18卷 1416-1418页

作者： Rong Min Wang juan juan Mao Jing Feng song Cai Xia Huo Yu Feng He Key Laboratory of Polymer Materials of Gansu Province Institute of Polymer Northwest Normal University Lanzhou 730070 China

Glutamic acid-salicylaldehyde Schiff-base metal complexes are bound into bovine serum albumin （BSA）, which afforded BSA binding Schiff-base metal complexes （BSA-SalGluM, M=Cu, Co, Ni, Zn）. The BSA binding metal complexes were characterized by UV-vis spectra and Native PAGE. It showed that the protein structures of BSA kept after coordinating amino acid Schiff-bases metal complexes. The effect of the antioxidant activity was investigated. The results indicate that the antioxidant capacity of BSA increased more than 10 times after binding Schiff-base metal complexes.

关键词： Natural polymer Schiff-base metal complexes Glutamic acid Bovine serum albumin (BSA) Antioxidants Hydroxyl radicals

Nonphytotoxic copper oxide nanoparticles are powerful“nanoweapons”that trigger resistance in tobacco against the soil-borne fungal pathogen Phytophthora nicotianae

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Journal of Integrative Agriculture 2022年第11期21卷 3245-3262页

作者： CHEN juan-ni WU Lin-tong song Kun ZHU Yun-song DING Wei Laboratory of Natural Product Pesticides College of Plant ProtectionSouthwest UniversityChongqing 400715P.R.China Jingxi Marketing Department of Basie of Guangxi Tobacco Company BaiseGuangxi 533899P.R.China

Investigations into the potential application of nanoparticles acting as nanofungicides in sustainable agriculture are rapidly expanding due to the high antimicrobial properties of these compounds,which do not risk inducing pathogen resistance to fungicides.A detailed understanding of the impact of copper oxide nanoparticles(CuO NPs)on soil-borne phytopathogenic fungi is yet to be *** study aimed to explore the in vitro antifungal activity and control efficacy of CuO NPs applied via irrigation with respect to tobacco black shank(TBS)disease caused by Phytophthora *** results revealed that CuO NPs greatly interfered with the reproductive growth process of this fungus,repressing hyphal growth,spore germination and sporangium ***,morphological damage,intracellular ROS accumulation and increased SOD enzyme activity in hyphae were the antifungicidal mechanisms of these *** pot experiments,treatment with CuO NPs at 100 mg L^(–1)significantly suppressed TBS development,compared with the effect on control plants,and the control efficacy reached 33.69%without inducing *** to CuO NPs significantly activated a series of defense enzymes,and resistance genes in tobacco can further explain the mechanisms by which CuO NPs suppressed fungal *** Cu content in both the leaves and roots of ***-infested plants increased by 50.03 and 27.25%,respectively,after treatment with 100 mg L^(–1)CuO NPs,compared with that of healthy *** particular,a higher Cu content was observed in infected roots than in ***,this study showed the potential of CuO NPs applied as nanofungicides and as nanoinducers of fungus resistance genes for the management of TBS through inhibition of pathogen infection and stimulation of plant defenses.

关键词： Nicotiana tabacum L. tobacco black shank disease cupper oxide nanoparticles fungicidal activities defense response stimulant

Fluoride Ion Adsorption Effect and Adsorption Mechanism of Self-Supported Adsorbent Materials Based on Desulfurization Gypsum-Aluminate Cement

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Journal of Renewable Materials 2023年第12期11卷 4079-4095页

作者： Xuefeng song Minjuan Sun juan He Lei Wang College of Materials Science and Engineering Xi’an University of Architecture and TechnologyXi’an710055China

The adsorption method has the advantages of low cost,high efficiency,and environmental friendliness in treating fluorinated wastewater,and the adsorbent material is the *** study combines the inherent anion-exchange adsorption properties of layered double hydroxides(LDHs).Self-supported porous adsorbent materials loaded with AFm and AFt were prepared from a composite cementitious system consisting of calcium aluminate cement(CAC)and flue gas desulfurization gypsum(FGDG)by chemical foaming *** mineral composition of the adsorbent material was characterized by X-ray diffraction(XRD)and Scanning electron microscopy(SEM).Through the static adsorption experiment,the adsorption effect of the mineral composition of the adsorbent on fluoride ions was deeply analyzed,and the adsorption mechanism was *** and SEM showed that the main hydration phases of the composite cementitious system consisting of CAC and FGDG are AFm,AFt,AH_(3),and CaSO_(4)·2H_(2)*** accelerates the hydration process of CAC and inhibits the transformation of AFt to *** AFt content increased,and the AFm content decreased or even disappeared as the amount of FGDG *** adsorption experiment results showed that AFm and AFt in adsorbent materials could significantly enhance the adsorption of fluoride *** adsorption of F^(−)in aqueous solution by PAG tends more towards monolayer adsorption with a theoretical maximum capacity of 108.70 mg/g and is similar to the measured value of 112.77 mg/g.

关键词： Flue gas desulfurization gypsum(FGDG) Calcium aluminate cement(CAC) AFm AFt Fluoride ions adsorption

Electrochemical dissolution behavior of gold and its main coexistent sulfide minerals in acid thiocyanate solutions

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Rare Metals 2022年第1期41卷 254-261页

作者： Guan Le Wen-juan Li Kun song Yong-Sheng song Yong Chen An-Ping Bai Yu Cheng National Engineering Laboratory of Biohydrometallurgy GRINM Group Co.Ltd.Beijing 100088China GRINM Resources and Environment Tech.Co. Ltd.Beijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China School of Chemical and Environmental Engineering China University of Mining and TechnologyBeijing 100083China GRIMAT Engineering Institute Co. Ltd.(GRIMAT)Beijing 101407China Jiangxi Copper Technology Research Institute Co. LtdNanchang 330096China Beijing Vocational College of Labour and Social Security Beijing 102200China Jiangsu East China Mineral Exploration and Development Bureau Nanjing 210007China

Electrochemical tests were developed to investigate the electrochemical dissolution behavior of gold and its main coexistent sulfide minerals in acid thiocyanate *** optimal leaching conditions for gold in acidic thiocyanate system were pH 2,0.15 mol·L^(-1) thiocyanate and 0.2 g·L^(-1)Fe^(3+).Fe^(3+) addition to the acidic thiocyanate system promoted gold dissolution significantly,arsenopyrite dissolution was inhibited,chalcopyrite dissolution was increased,and the dissolution behavior of other associated minerals remained mostly *** made gold and associated mineral leaching *** galvanic corrosion effect of gold and its main coexistent sulfide minerals in an acidic thiocyanate-free system was that the chalcocite,arsenopyrite and pyrite acted as a cathode to reduce anodic gold dissolution;galena as an anode undergoes oxidation to inhibit anodic gold *** was almost no galvanic corrosion behavior between stibnite,yellow sphalerite and black sphalerite and *** addition changed the galvanic corrosion behavior of stibnite and yellow sphalerite in the thiocyanate system,which inhibited anodic gold *** the acidic thiocyanate system in the presence of ferric iron,the arsenopyrite promoted anodic gold dissolution,the chalcocite and gold were mostly free of galvanic corrosion,and the remaining minerals inhibited anodic gold dissolution.

关键词： Acid thiocyanate Ferric iron Electrochemical adsorption Associated mineral

A selective voltammetric detection for dopamine using poly(gallic acid) film modified electrode

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Chinese Chemical Letters 2010年第3期21卷 349-352页

作者： song, Wei Chen, Yu Xu, juan Tian, Dan Bi Nanjing Univ Technol Coll Sci Nanjing 210009 Peoples R China

The electrochemistry behavior of dopamine was investigated by cyclic voltammetry and differential pulse voltammetry at a poly (gallic acid) film modified glassy carbon *** electrons and two protons participated in the diffusion-controlled electrocatalytic oxidation of dopamine with a diffusion coefficient of 2.186×10^(-5) cm^2/*** interference of ascorbic acid with the determination of dopamine could be efficiently *** work provided a simple approach to selectively and sensitively de...

关键词： Dopamine Ascorbic acid Gallic acid Electropolymerization Modified electrode

Assimilation of High Frequency Radar Data into a Shelf Sea Circulation Model

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Journal of Ocean University of China 2014年第4期13卷 572-578页

作者： XU Jiangling HUANG juan GAO song CAO Yajing North China Sea Marine Forecast Center of the State Oceanic Administration

High Frequency(HF) radar current data is assimilated into a shelf sea circulation model based on optimal interpolation(OI) method. The purpose of this work is to develop a real-time computationally highly efficient assimilation method to improve the forecast of shelf current. Since the true state of the ocean is not known, the specification of background error covariance is arduous. Usually, it is assumed or calculated from an ensemble of model states and is kept in constant. In our method, the spatial covariances of model forecast errors are derived from differences between the adjacent model forecast fields, which serve as the forecast tendencies. The assumption behind this is that forecast errors can resemble forecast tendencies, since variances are large when fields change quickly and small when fields change slowly. The implementation of HF radar data assimilation is found to yield good information for analyses. After assimilation, the root-mean-square error of model decreases significantly. Besides, three assimilation runs with variational observation density are implemented. The comparison of them indicates that the pattern described by observations is much more important than the amount of observations. It is more useful to expand the scope of observations than to increase the spatial interval. From our tests, the spatial interval of observation can be 5 times bigger than that of model grid.

关键词： data assimilation current radar shelf circulation model