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| 1 | The Distribution of Cu Content of Soil in Different Land Use Types in the Suburbs of Changchun City显示文摘In order to understand the heavy metal contamination of Cu in the farmland soil in the suburbs of Changchun City,and reveal the distribution of Cu content of soil in different farmland types,we use the methods field survey and laboratory analysis,to analyze the Cu content of soil in different farmland types in the suburbs of Changchun City. Using SPSS statistical analysis software and ORING mapping software,we process the data of Cu content in 60 sampling points and draw the normal distribution map,and then analyze the distribution of Cu content of soil in different land use types. The results show that the Cu content of the farmland soil in the suburbs of Changchun City is between 41. 71 mg /kg and 116. 77 mg /kg,with an average of 53. 35 mg /kg,and the content in all sampling points is higher than the background value; in terms of the Cu content of soil,different land use types are sequenced in descending order(vegetable field > paddy > dry land). | Wei SU Dongmei LIANG Minghui CHEN Guisheng SHEN | 2014 | Asian Agricultural Research2014，6，8： | 0 |
| 2 | Threshold Filtering Semi-Supervised Learning Method for SAR Target Recognition显示文摘The semi-supervised deep learning technology driven by a small part of labeled data and a large amount of unlabeled data has achieved excellent performance in the field of image processing.However,the existing semisupervised learning techniques are all carried out under the assumption that the labeled data and the unlabeled data are in the same distribution,and its performance is mainly due to the two being in the same distribution state.When there is out-of-class data in unlabeled data,its performance will be affected.In practical applications,it is difficult to ensure that unlabeled data does not contain out-of-category data,especially in the field of Synthetic Aperture Radar(SAR)image recognition.In order to solve the problem that the unlabeled data contains out-of-class data which affects the performance of the model,this paper proposes a semi-supervised learning method of threshold filtering.In the training process,through the two selections of data by the model,unlabeled data outside the category is filtered out to optimize the performance of the model.Experiments were conducted on the Moving and Stationary Target Acquisition and Recognition(MSTAR)dataset,and compared with existing several state-of-the-art semi-supervised classification approaches,the superiority of our method was confirmed,especially when the unlabeled data contained a large amount of out-of-category data. | Linshan Shen Ye Tian Liguo Zhang Guisheng Yin Tong Shuai Shuo Liang Zhuofei Wu | 2022 | Computers, Materials & Continua2022，，10： | 0 |
| 3 | PCR Detection of Streptococcus agalactiae in Dairy Cows Suffering from Mastitis显示文摘[Objective] This study aimed to identify Streptococcus agalactiae and lay the foundation for the prevention and control of mastitis in dairy cows. [Method]Ten strains were isolated from milk samples produced by diseased dairy cows suffering from mastitis for morphologic observation,culture characteristic investigation,biochemical identification and Lancefield grouping. The isolated strains were identified at the molecular level by nested-PCR. [Result] Among the ten isolates,six strains were β-hemolytic and Gram-positive on blood agar,belonging to Lancefield group B,which were identified as Streptococcus agalactiae by biochemical identification and nested-PCR. After overnight incubation,the coincidence rate between results of nested-PCR detection and biochemical identification reached 100%. [Conclusion] Bacterial incubation,rapid DNA extraction and specific PCR can provide basis for early epidemiological survey of Streptococcus agalactiae infection in cattle. | Yanying ZHANG Guisheng GAO Zhengben LI Guangping GAO Qiumei SHI Xinhua SHAO Yinju LIANG Huiran LIU | 2013 | Agricultural Biotechnology2013，2，5： | 0 |
| 4 | Micro-nano structured VNb_(9)O_(25)anode with superior electronic conductivity for high-rate and long-life lithium storage显示文摘The oxygen vacancies and micro-nano structure can optimize the electron/Li+migration kinetics in anode materials for lithium batteries(LIBs).Here,porous micro-nano structured VNb_(9)O_(25)composites with rich oxygen vacancies were reasonably prepared via a facile solvothermal method combined with annealing treatment at 800℃for 30 h(VNb_(9)O_(25)-30 h).This micro-nano structure can enhance the contact of active material/electrolyte,and shorten the Li+diffusion distance.The introduction of oxygen vacancies can further boosts the intrinsic conductivity of VNb_(9)O_(25)-30 h for achieving excellent LIB performance.The as-prepared VNb_(9)O_(25)-30 h anode showed advanced rate capability with reversible capacity of 122.2 m A h g^(-1)at 4 A g^(-1),and delivered excellent capacity retention of~100%after 2000 cycles.Meanwhile,VNb_(9)O_(25)-30 h provides unexpected long-cycle life(i.e.,reversible capacity of 165.7 m A h g^(-1)at 1 A g^(-1)with a high capacity retention of 85.6%even after 8000 cycles).Additionally,coupled with the Li Fe PO4 cathode,the Li Fe PO4//VNb_(9)O_(25)-30 h full cell delivers superior LIB properties with high reversible capacities of 91.6 m A h g^(-1)at 5 C for 1000 cycles.Thus,such reasonable construction method can assist in other high-performance niobium-based oxides in LIBs. | Mingxing Liang Yongcong Huang Yuda Lin Guisheng Liang Cihui Huang Lan Chen Jiaxin Li Qian Feng Chunfu Lin Zhigao Huang | 2021 | Journal of Materials Science & Technology2021，，24： | 0 |
| 5 | Distribution Characteristics of Pb and Its Ecological Risk in Different Farmland Soils of Changchun Suburb显示文摘Pb in the farmland surface soil of Changchun suburb was taken as the main research object. The field research and laboratory analysis were used to investigate Pb content,spatial distribution characteristics and its ecological risk in different farmland soils. The results showed that Pb content was during 18. 85- 41. 34 mg /kg in farmland soil of Changchun suburb,and was higher than the background value of Jilin Province at 90%of the sampling sites. The spatial distribution of Pb content in farmland soil had obvious geographical features,and Pb content in southwest and northeast soils was higher. The high-content areas were relatively concentrated,and Pb content gradually reduced from the high-content islandshape center to its surrounding. The soil Pb contents in paddy field,dry field and vegetable field had insignificant difference with the background value,indicating that Pb accumulations in dry field,paddy field and vegetable field were not significant. The order of Pb content in different land use types was showed as follows: vegetable field > dry field > paddy field. Pb pollution of all samples belonged to light pollution. The average potential ecological risk of soil Pb in different land use types presented the following order: vegetable field > dry field > paddy field. | Su Wei Liang Dongmei Chen Minghui Shen Guisheng | 2014 | Meteorological and Environmental Research2014，5，4： | 0 |
| 6 | Microwave assisted synthesis of PQ-GDY@NH_(2)-UIO-66(Zr) for improved photocatalytic removal of NOx under visible light显示文摘Pyrazinoquinoxaline-based graphdiyne (PQ-GDY) contains a fixed number of sp-sp2hybridized carbon atoms and pyrazine-like sp2hybridized N atoms.In this paper,NH_(2)-UIO-66(Zr) on PQ-GDY substrate was successfully constructed with the help of microwaveassisted heating.PQ-GDY surface acts as a microwave antenna under microwave irradiation to rapidly absorb microwave energy and form hot spots (hot spot effect),which facilitates the formation of well-dispersed NH2-UIO-66(Zr) with good crystallinity.Transient absorption spectra show that high hole transport property of PQ-GDY can accelerate the migration of photogenerated holes from NH2-UIO-66(Zr) to PQ-GDY and greatly reduce the recombination rate of photogenerated electrons and holes due to the strong interaction between PQ-GDY and NH2-UIO-66(Zr).Under visible light (λ≥420 nm),PQ-GDY@NH_(2)-UIO-66(Zr) shows high photocatalytic stability and high NO_(x)removal rate up to 74%,which is 44% higher than that of primitive NH_(2)-UIO-66(Zr).At the same time,it inhibits the formation of toxic byproducts (NO2) and limits its concentration to a low level. | Qingyu Yang Shuangjun Li Rui Liang Lei Gao Shao Zhang Junfen Jia Yiran Liu Rundong Lyv Guisheng Li Shengxiong Xiao Dieqing Zhang | 2023 | Journal of Environmental Sciences2023，，12： | 0 |
| 7 | AN APPROACH TO SUPPRESS SHORT-RANGE CLUTTER FOR NON-SIDE LOOKING AIRBORNE RADAR显示文摘When the Airborne Early Warning(AEW) radar transmits medial or high Pulse Repetitive Frequency(PRF) signal,the range ambiguity occurs.The clutter of short-range clutter has serious range dependence problem for non-Side Looking Airborne Radar(non-SLAR).As a result,the clutter plus noise covariance matrix can not be estimated correctly,and the performance of clutter suppression obtained by Space-Time Adaptive Processing(STAP) degrades greatly.The uniform linear array has not elevation degrees;therefore,the short-range clutter can not be suppressed directly.A short-range clutter suppression method is proposed.The method first estimate the elevation angles of the ambiguous short-range gate,then eliminates short-range clutter by space time interpolation and adds moving target protection in the procedure.This method can suppress the short-range clutter well.Simulation results show the validity of the method. | Li Ming Liao Guisheng Zhang Liang | 2011 | Journal of Electronics(China)2011，28，1： | 0 |
| 8 | A STUDY OF REDUCED-RANK STAP显示文摘This paper starts with the discussion of the principle of Reduced-Rank (RR) Space-Time Adaptive Processing (STAP). It is followed by a dedication of the upper bound performance of all eigen-based RR methods provided by Cross Spectral Method (CSM) under the condition of a given processor rank and an identical secondary sample size. A performance comparison between two RR STAP processors with prefixed structure and CSM is performed by the means of simulations. It is shown that the performance of time pre-filtering followed by jointly localized STAP structure (i.e. 3DT-SAP) is very close to the upper bound and thereby it is an effective RR approach. | Zhang Liang Bao Zheng Liao Guisheng (Key Lab. for Radar Signal Processing, Xidan University, Xi’an 710071, China) | 2000 | Journal of Electronics(China)2000，17，4： | 0 |
| 9 | Precipitation is the dominant driver for bird species richness,phylogenetic and functional structure in university campuses in northern China显示文摘Background:Although urbanization is threatening biodiversity worldwide,the increasing green urban spaces could harbor relatively high biodiversity.Therefore,how to maintain the biodiversity in urban ecosystem is crucial for sustainable urban planning and management,especially in arid and semiarid regions with relatively fragile environment and low biodiversity.Here,for the first time we linked species richness,phylogenetic and functional structure of bird assemblages in university campuses in northern China with plant species richness,glacial-interglacial climate change,contemporary climate,and anthropogenic factors to compare their relative roles in shaping urban bird diversity.Methods:Bird surveys were conducted in 20 university campuses across Inner Mongolia,China.Ordinary least squares models and simultaneous autoregressive models were used to assess the relationships between bird species richness,phylogenetic and functional structure with environmental factors.Structural equation models were used to capture the direct and indirect effects of these factors on the three components of bird diversity.Results:Single-variable simultaneous autoregressive models showed that mean annual precipitation was consistently a significant driver for bird species richness,phylogenetic and functional structure.Meanwhile,mean annual temperature and plant species richness were also significant predictors for bird species richness.Conclusions:This study suggests that campuses with warmer and wetter climate as well as more woody plant species could harbor more bird species.In addition,wetter campuses tended to sustain over-dispersed phylogenetic and functional structure.Our findings emphasize the dominant effect of precipitation on bird diversity distribution in this arid and semiarid region,even in the urban ecosystem. | Chenxia Liang Jun Liu Bin Pan Na Wang Jie Yang Guisheng Yang Gang Feng | 2020 | Avian Research2020，11，3： | 0 |
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