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An assessment of China’s participation in polar subregional organizations

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Advances in Polar Science 2023年第1期34卷 56-65页

作者： SHAN Yanyan he jianfeng GUO Peiqing he Liu Polar Research Institute of China Shanghai 200136China Ocean University of China Qingdao 266100China Shanghai University of Political Science and Law Shanghai 201701China

International cooperation is vital for the polar ***’s past polar cooperation has tended to focus on intergovernmental and bilateral mechanisms rather than regional ***,regional and subregional cooperation is playing an increasing role in the polar regions with the rapid development of geopolitics and global climate *** in three subregional polar organizations—the Asian Forum for Polar Sciences(AFoPS),the Pacific Arctic Group(PAG),and the China-Nordic Arctic Research Center(CNARC)—in the last two decades reflects China’s improved skills and flexibility in participating in international polar cooperation and represents an exercise in the“win-win”principle under China’s Arctic *** paper presents a review of the development of polar subregional cooperation,examines China’s participation in three of subregional organizations and provides feasible suggestions for China’s future engagement with these organizations.

关键词： polar subregional international cooperation

Immobilization of Glucose Oxidase on Ordered Macroporous Silicas Functionalized with Amino Group

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Chinese Journal of Chemistry 2012年第2期30卷 283-287页

作者： Wu,Quanzhou he,jianfeng Zhang,Jingjia Ou,Jiming College of Chinese Materia Medica Guangzhou University of Chinese MedicineGuangzhouGuangdong 510006China

A novel glucose oxidase immobilized on three-dimensionally ordered macroporous （3DOM） material has been prepared by firstly preparation of hybrid 3DOM SiO2-NH2 materials using colloidal crystal method, and following covalent immobilization of glucose oxidase on the pore walls of the 3DOM materials. The materials were characterized by SEM, FTIR, DSC and BET techniques. SEM observation shows that the macropores are highly ordered and are interconnected by small windows. FTIR measurement shows that there are amino and organic groups in the pore walls. The surface area of the 3DOM SiO2-NH2 material is about 10.2 m2/g. The loaded amount of enzyme is increased with amino content in the materials. The immobilized enzyme has high activity, thermal stability and can be reused.

关键词： three-dimensionally ordered macropore SiO2 glucose oxidase supported catalyst materials science

Flow cytometry investigation of picoplankton across latitudes and along the circum Antarctic Ocean

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Acta Oceanologica Sinica 2012年第1期31卷 134-142页

作者： LIN Ling he jianfeng ZHAO Yunlong ZHANG Fang CAI Minghong College of Life Science East China Normal UniversityShanghai 200062China Key Laboratory for Polar Science of State Oceanic Administration Polar Research Institute of ChinaShanghai 200136China

Using a flow cytometer （FCM） onboard the R/V Xuelong during the 24th Chinese Antarctic cruise, picoplankton community structure and biomass in the surface water were examined along the latitude and around the Antarctic Ocean. Salinity and temperature were automatically recorded and total Chl a was determined. Along the cruise, the abundance of Synechococcus, Prochlorococ- cus, pico-eukaryotes and heterotrophic bacteria ranged in 0.001-1.855~ 10s ind./L, 0.000-2.778×108 ind./L, 0.002-1.060×108 ind./L and 0.132-27.073×108 ind./L, respectively. Major oceanic distri- bution of Synechococcus and Prochlorococcus appeared between latitudes 30°N and 30°S. Prochlorococcus was mainly influenced by water temperature, water mass combination and freshwater inflow. Meanwhile, Synechococcus distribution was significantly associated with landing freshwater inflow. Pico-eukaryotes and heterotrophic bacteria were distributed all over the oceans, but with a relatively low abundance in the high latitudes of the Antarctic Ocean. Principal Component Analysis showed that at same latitude of Atlantic Ocean and Indian Ocean, picoplankton distribution and constitution were totally different, geographical location and different water masses combination would be main reasons.

关键词： picoplankton distribution Antarctic Ocean FCM

Factors dominating bacterioplankton abundance and production in the Nordic seas and the Chukchi Sea in summer 2012

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Acta Oceanologica Sinica 2017年第8期36卷 153-162页

作者： GAO Yuan he jianfeng CheN Min LIN Ling ZHANG Fang College of Ocean and Earth Sciences Xiamen UniversityXiamen 361005China State Oceanic Administration Key Laboratory for Polar Science Polar Research Institute of ChinaShanghai 200136China State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361005China

Abundance and production of bacterioplankton were measured in the Nordic seas and Chukchi Sea during the 5th Chinese Arctic Research Expedition in summer 2012. The results showed that average bacterial abundances ranged from 3.31×10^11 cells/m^3 to 2.25× 10^11 cells/m^3, and average bacterial productions （calculated by carbon） were 0.46 mg/（m^3·d） and 0.54 mg/（m^3·d） in the Nordic seas and Chukchi Sea, respectively. T-test result showed that bacterial abundances were significantly different between the Nordic seas and Chukchi Sea, however, no significant difference was observed regarding bacterial productions. Based on the slope of lg bacterial biomass versus lg bacterial production, bacterial communities in the Nordic seas and Chukchi Sea were moderately dominated by bottom-up control. Both Pearson correlation analysis and multivariable linear regression indicated that temperature had significant positive correlation with bacterial abundance in the Chukchi Sea, while no correlations with productions in both areas. Meanwhile, Chl a had positive correlations with both bacterial abundance and production in these two regions. As the temperature and Chl a keep changing in the future, we suggest that both bacterial abundance and production been hanced in the Chukchi Sea but weaken in the Nordic seas, though the enhancement will not be dramatic as a result of higher pressure of predation and viral lysis.

关键词： bacterioplankton abundance production Arctic Ocean environmental factors

A Deep Learning Framework for Mass-Forming Chronic Pancreatitis and Pancreatic Ductal Adenocarcinoma Classification Based on Magnetic Resonance Imaging

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Computers, Materials & Continua 2024年第4期79卷 409-427页

作者： Luda Chen Kuangzhu Bao Ying Chen Jingang Hao jianfeng he Faculty of Information Engineering and Automation Kunming University of Science and TechnologyKunming650504China Department of Radiology Second Affiliated Hospital of Kunming Medical UniversityKunming650101China School of Physics and Electronic Engineering Yuxi Normal UniversityYuxi653100China

Pancreatic diseases, including mass-forming chronic pancreatitis (MFCP) and pancreatic ductal adenocarcinoma(PDAC), present with similar imaging features, leading to diagnostic complexities. Deep Learning (DL) methodshave been shown to perform well on diagnostic tasks. Existing DL pancreatic lesion diagnosis studies basedon Magnetic Resonance Imaging (MRI) utilize the prior information to guide models to focus on the lesionregion. However, over-reliance on prior information may ignore the background information that is helpful fordiagnosis. This study verifies the diagnostic significance of the background information using a clinical ***, the Prior Difference Guidance Network (PDGNet) is proposed, merging decoupled lesion andbackground information via the Prior Normalization Fusion (PNF) strategy and the Feature Difference Guidance(FDG) module, to direct the model to concentrate on beneficial regions for diagnosis. Extensive experiments inthe clinical dataset demonstrate that the proposed method achieves promising diagnosis performance: PDGNetsbased on conventional networks record an ACC (Accuracy) and AUC (Area Under the Curve) of 87.50% and89.98%, marking improvements of 8.19% and 7.64% over the prior-free benchmark. Compared to lesion-focusedbenchmarks, the uplift is 6.14% and 6.02%. PDGNets based on advanced networks reach an ACC and AUC of89.77% and 92.80%. The study underscores the potential of harnessing background information in medical imagediagnosis, suggesting a more holistic view for future research.

关键词： Pancreatic cancer pancreatitis background region prior normalization fusion feature difference guidance

Denaturing gradient gel electrophoresis fingerprinting of soil bacteria in the vicinity of the Chinese Great Wall Station, King George Island, Antarctica

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Journal of Environmental Sciences 2013年第8期25卷 1649-1655页

作者： Qi Pan Feng Wang Yang Zhang Minghong Cai jianfeng he Haizhen Yang Key Laboratory of Yangtze River Water Environment Ministry of Education College of Environmental Science and Engineering Tongji University Jinan Municipal Engineering Design and Research Institute Co. Ltd. Key Laboratory for Polar Science of State Ocean Administration Polar Research Institute of China

Bacterial diversity was investigated in soil samples collected from 13 sites around the Great Wall Station, Fildes Peninsula, King George Island, Antarctica, using denaturing gradient gel electrophoresis （DGGE） of 16S rRNA genes. The classes α-, β-, and γ-Proteobacteria, as well as the phylum Actinobacteria, were found to be the dominant bacteria in the soils around the Great Wall Station. Although the selected samples were not contaminated by oil, a relationship between soil parameters, microbial biodiversity, and human impact was still seen. Sample sites in human impacted areas showed lower bacterial biodiversity （average H′= 2.65） when compared to nonimpacted sites （average H′= 3.05）. There was no statistically significant correlation between soil bacterial diversity and total organic carbon （TOC）, total nitrogen, or total phosphorus contents of the soil. Canonical correlation analysis showed that TOC content was the most important factor determining bacterial community profiles among the measured soil parameters. In conclusion, microbial biodiversity and community characteristics within relatively small scales （1.5 km） were determined as a function of local environment parameters and anthropogenic impact.

关键词： Antarctica 16S rRNA gene denaturing gradient gel electrophoresis human impact

Characterization of the summer pack ice biotic community of Canada Basin

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Acta Oceanologica Sinica 2005年第6期24卷 80-87页

作者： he jianfeng CAI Minghong JIANG Xiaodong CheN Bo YU Yong State Oceanic Administration Key Laboratory for Polar Science Polar Research Institute of ChinaShanghai 200136China

Summer pack ice biotic community of the Canada Basin was characterized duringthe Second Chinese National Arctic Research Expedition(CHINARE-2003,20 August—5 September 2003).Bacteria,ice algae(diatoms and autotrophic flagellates)and protozoa(mainly heterotrophicflagellates)were observed throughout the whole ice *** vertical distribution of biotic taxavaried among *** integrated biomass ranged from 48.4 and 58.1 mg/m^(2),with an average of55.2 mg/m^(2).Bacteria were the dominant of the assemblage in pack ice,accounted for 84.1%of theintegrated,and ice algae,which usually dominate the ice biotic community,constituted only 3.5%ofthe *** the quick environmental changes of the Arctic Ocean in recent years,wesuggested that quick melting of pack ice in summer was suggested,which caused such change of packice biotic *** low salinity throughout the whole ice column and the continuous melting ofthe pack ice cumbered the formation of ice algae bloom in summer,finally resulting in thedominance of microbial food web with bacteria and heterotrophic flagellates as the most *** the high ratio of pack ice primary production to the total found inprevious studies,the quick change of pack ice community structure in summer would deeply influencethe marine ecosystem of the high Arctic Ocean.

关键词： arctic ocean canada basin pack ice community

Positron Emission Tomography Lung Image Respiratory Motion Correcting with Equivariant Transformer

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Computers, Materials & Continua 2024年第5期79卷 3355-3372页

作者： jianfeng he Haowei Ye Jie Ning Hui Zhou Bo She Faculty of Information Engineering and Automation Kunming University of Science and TechnologyYunnan Key Laboratory of Artificial IntelligenceKunming650500China School of Physics and Electronic Engineering Yuxi Normal UniversityYuxi653100China PET/CT Center Affiliated Hospital of Kunming University of Science and TechnologyFirst People’s Hospital of Yunnan ProvinceKunming650031China

In addressing the challenge of motion artifacts in Positron Emission Tomography (PET) lung scans, our studyintroduces the Triple Equivariant Motion Transformer (TEMT), an innovative, unsupervised, deep-learningbasedframework for efficient respiratory motion correction in PET imaging. Unlike traditional techniques,which segment PET data into bins throughout a respiratory cycle and often face issues such as inefficiency andoveremphasis on certain artifacts, TEMT employs Convolutional Neural Networks (CNNs) for effective featureextraction and motion ***’s unique approach involves transforming motion sequences into Liegroup domains to highlight fundamental motion patterns, coupled with employing competitive weighting forprecise target deformation field generation. Our empirical evaluations confirm TEMT’s superior performancein handling diverse PET lung datasets compared to existing image registration networks. Experimental resultsdemonstrate that TEMT achieved Dice indices of 91.40%, 85.41%, 79.78%, and 72.16% on simulated geometricphantom data, lung voxel phantom data, cardiopulmonary voxel phantom data, and clinical data, respectively. Tofacilitate further research and practical application, the TEMT framework, along with its implementation detailsand part of the simulation data, is made publicly accessible at https://***/yehaowei/temt.

关键词： PET lung scans respiratory motion correction triple equivariant motion transformer lie group motion decomposition

Variability of size-fractionated phytoplankton standing stock in the Amundsen Sea during summer

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Advances in Polar Science 2022年第1期33卷 1-13页

作者： ZHANG Wei HAO Qiang he jianfeng PAN Jianming Second Institute of Oceanography Ministry of Natural Resources(MNR)Hangzhou 310000China Key Laboratory of Marine Ecosystem Dynamics Ministry of Natural ResourcesHangzhou 310000China Key Laboratory of Polar Science MNRPolar Research Institute of ChinaShanghai 200136China

The size-fractionated composition of phytoplankton greatly influences the transfer efficiency of biomass in pelagic food chains and the biological carbon flux from surface waters to the deep *** better understand phytoplankton abundance and composition in polynya,ice zone,and open ocean regions of the Amundsen Sea Sector of the Southern Ocean(110°W-150°W),its size-fractionated distribution and vertical structure are reported for January to February *** integrated(0-200 m)chlorophyll(Chl)a concentrations within Amundsen polynya regions are significantly higher than those within ice zone(t test,phelf regions,especially at the southern ends of 112°W and 145°***(>20μm)contribute 60%of the total Chl in Amundsen polynya and sea ice areas,and form subsurface chlorophyll maxima(SCM)above the pycnocline in the upper water column,probably because of diatom ***-,nano-,and picoplankton comprise 39%,32%,and 29%of total Chl in open ocean stations,*** open-ocean SCM migrates deeper and is below the *** Amundsen Sea SCM is moderately,positively correlated with the euphotic zone depth and moderately,negatively correlated with column-integrated net-and nanoplankton Chl.

关键词： size-fractionated phytoplankton chlorophyll a subsurface chlorophyll maxima polynya Amundsen Sea