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Export of dissolved carbonaceous and nitrogenous substances in rivers of the “Water Tower of Asia”

Journal of Environmental Sciences 2018年第3期30卷 53-61页

作者： Bin Qu Mika Sillanpaa Shichang Kang Fangping Yan Zhiguo li Hongbo Zhang Chaoliu li Laboratory of Green Chemistry Lappeenranta University of Technology Mikkeli 50130 Finland Key Laboratory of Tibetan Enuironment Changes and Land Surface Processes Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100101 China state Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou Gansu 730000 China Shangqiu Normal University Shangqiu He'nan 476000 China CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences Beijing 100085 China

Rivers are critical links in the carbon and nitrogen cycle in aquatic,terrestrial,and atmospheric *** riverine carbon and nitrogen exports in nine large rivers on the Tibetan Plateau—the＂Water Tower of Asia＂—were investigated in the monsoon season from 2013 to *** with the world average,concentrations of dissolved inorganic carbon（DIC,30.7 mg/L）were high in river basins of the plateau due to extensive topographic relief and intensive water *** concentrations of dissolved organic carbon（DOC,1.16 mg/L）were likely due to the low temperature and unproductive land vegetation *** concentrations of riverine DIN（0.32 mg/L）and DON（0.35 mg/L）on the Tibetan Plateau were close to the world ***,despite its predominantly pristine environment,discharge from agricultural activities and urban areas of the plateau has raised riverine N *** addition,DOC/DON ratio（C/N,~6.5）in rivers of the Tibetan Plateau was much lower than the global average,indicating that dissolved organic carbon in the rivers of this region might be more ***,along with global warming and anthropogenic activities,increasing export of bioavailable riverine carbon and nitrogen from rivers of the Tibetan Plateau can be expected in the future,which will possibly influence the regional carbon and nitrogen cycle.

关键词： Dissolved carbon Dissolved nitrogen Rivers The Tibetan Plateau

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Ferroelectric-controlled graphene plasmonic surfaces for all-optical neuromorphic vision

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Science China(Technological Sciences) 2024年第3期67卷 765-773页

作者： CHEN JianBo liU Yu li ShangDong liN lin li YaDong HUANG Wen GUO JunXiong School of Electronic Information and Electrical Engineering Institute for Advanced StudyChengdu UniversityChengdu 610106China School of Integrated Circuits Tsinghua UniversityBeijing 100084China School of Integrated Circuits(National Exemplary Schoolof Microelectronics) Universityof Electronic Science and Technologyof China Chengdu 610054China Jincheng Research Institute of Opto-mechatronics Industry Jincheng 048000China Shanxi Key Laboratory of Advanced Semiconductor Optoelectronic Devices and Integrated Systems Jincheng 048000China Engineering Research Center of Digital Imaging and Display Ministry of EducationSoochow UniversitySuzhou 215006China

Artificial visual systems can recognize desired objects and information from complex environments, and are therefore highly desired for pattern recognition, object detection, and imaging applications. However, state-of-the-art artificial visual systems with high recognition performances that typically consist of electronic devices face the challenges of requiring huge storage space and high power consumption owing to redundant data. Here, we report a terahertz(THz) frequency-selective surface using a graphene split-ring resonator driven by ferroelectric polarization for efficient visual system applications. The downward polarization of the ferroelectric material offers an ultrahigh electrostatic field for doping p-type graphene with an anticipated Fermi level. By optimizing the geometric parameters of the devices and modulating the carrier behaviors of graphene, our plasmonic devices exhibit a tunable spectral response in a range of 1.7–6.0 THz with continuous transmission values. The alloptical neural network using graphene plasmonic surfaces designed in this study exhibited excellent performance in visual preprocessing and convolutional filtering and achieved an ultrahigh recognition accuracy of up to 99.3% in training the Modified National Institute of Standards and Technology(MNIST) handwritten digit dataset. These features demonstrate the great potential of graphene plasmonic devices for future smart artificial vision systems.

关键词： graphene plasmon ferroelectric frequency selective surface artificial vision system

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Distribution patterns of octylphenol and nonylphenol in the aquatic system at Mai Po Marshes Nature Reserve,a subtropical estuarine wetland in Hong Kong

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Journal of Environmental Sciences 2007年第6期19卷 657-662页

作者： li Xiang-li LUAN Tian-gang liANG Yan WONG Ming-hung LAN Chong-yu Croucher Institute for Environmental Sciences and Department of Biology Hong Kong Baptist UniversityHong Kong China state Key Laboratory of Biocontrol School of life Sciences Sun Yat-Sen （Zhongshan） University Guangzhou 510275 China

Spatial and temporal distribution of octylphenol （OP） and nonylphenol （NP） in Mai Po Marshes, a subtropical estuarine wetland in Hong Kong, were investigated. Surface water samples were collected every month from 11 sites during the period of September- December 2004. Concentrations of OP and NP ranged from 11.3 to 348 ng/L and from 29 to 2591 ng/L, respectively. The high levels of NP and OP were found in November and December than in September and October. The levels of OP and NP have no significant spatial differences except September. Total organic matter in the sediments appeared to be an important factor in controlling the fate of these compounds in the aquatic environment.

关键词： octylphenol nonylphenol endocrine-disrupting chemicals Ramsar Site

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Viscosity profile prediction of a heavy crude oil during lifting in two deep artesian wells

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Chinese Journal of Chemical Engineering 2017年第7期25卷 976-982页

作者： Yibo li Hao Gao Wanfen Pu Bing Wei Yafei Chen Dong li Qiang Luo state Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Research Institute of Experiment and Detection Xinjiang Oilfield CompanyPetroChina

It has been known that the productivity of artesian wells is strongly dependent on the rheological properties of crude oils. This work targets two deep artesian wells(>5000 m) that are producing heavy crude oil. The impacts of well conditions including temperature, pressure and shear rate, on the crude oil rheology were comprehensively investigated and correlated using several empirical rheological models. The experimental data indicate that this heavy oil is very sensitive to temperature as result of microstructure change caused by hydrogen bonding. The rheological behavior of the heavy oil is also significantly impacted by the imposed pressure, i.e., the viscosity flow activation energy(Eμ) gently increases with the increasing pressure. The viscosity–shear rate data are well fitted to the power law model at low temperature. However, due to the transition of fluid feature at high temperature(Newtonian fluid), the measured viscosity was found to slightly deviate from the fitting data. Combining the evaluated correlations, the viscosity profile of the heavy crude oil in these two deep artesian wells as a function of well depth was predicted using the oilfield producing data.

关键词： Heavy oil Rheological properties Empirical correlation Viscosity profile predication lifting process Artesian well

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Experimental investigation and thermodynamic assessment of La-Y-Ni ternary system in Ni-rich corner

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Rare Metals 2023年第4期42卷 1316-1331页

作者： Sheng-Xiang Wu li Wang Hui-Ping Yuan Qun Luo Qian li Kuo-Chih Chou state Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou014030China state Key Laboratory of Advanced Special Steels Shanghai Key Laboratory of Advanced FerrometallurgySchool of Materials Science and EngineeringShanghai UniversityShanghai200444China GRIMAT Engineering Institute Co. Ltd.Beijing101407China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing400044China

La-Y-Ni alloys exhibit high discharge capacity due to the formation of AB_(3-3.8)-type(A=La,Y;B=Ni)intermetallic ***,the stable composition and temperature range for this type of phase are rarely reported,which restrains the development of La-Y-Ni hydrogen storage alloys with stable structure and high *** paper focuses on the phase equilibria of the La-Y-Ni ternary system in Ni-rich *** phase constitution,microstructure,and equilibrated composition were experimentally determined at 1273 and 1148 K using X-ray diffraction(XRD),scanning electron microscopy(SEM),and energy-dispersive spectroscopy(EDS).The solubilities of La and Y in the binary compounds were *** ternary compounds,3R-LaY_(2)Ni_(9)with the structure of PuNi3 type and La_(0.5)Y_(0.5)Ni_(5)with the structure of CaCu5 type,existed at both *** on the experimental data,the thermodynamic description of LaY-Ni system was assessed by Calculation of Phase Diagram *** calculated isothermal sections agree with the experimental *** thermodynamic database is helpful for the design of La-Y-Ni hydrogen storage alloys.

关键词： La-Y-Ni system Phase equilibria Calculation of Phase Diagram(CALPHAD) Isothermal section Phase transformation

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Improving the xanthine oxidase and adenosine deaminase inhibitory activities of Flos Sophorae Immaturus by ultrasound-assisted heating treatments

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Food Bioscience 2023年第1期51卷 420-429页

作者： Jun li Yuhong Gong Jinwei li liuping Fan state Key Laboratory of Food Science&Technology Jiangnan University1800 Lihu AvenueWuxiJiangsu214122China School of Food Science and Technology Jiangnan University1800 Lihu AvenueWuxiJiangsu214122China Collaborat Innovat Ctr Food Safety&Qual Control Jiangnan University1800 Lihu AvenueWuxiJiangsu214122China Institute of Food Processing Technology Guizhou Academy of Agricultural SciencesGuiyang550006China

Flos Sophorae Immaturus(FSI)is consumed as a natural food rich in flavonoids and exhibits potential xanthine oxidase(XOD)and adenosine deaminase(ADA)inhibitory ***,ultrasound and heating treatments were applied to improve the XOD and ADA inhibitory effects of FSI,and the mechanisms were revealed by tracking the changes of *** showed that ultrasound(480 W,60 min)assisted heating treatments(180℃,60 min)significantly improved the XOD(from 40.97%to 83.47%)and ADA(6.64%-23.28%)inhibition ***,ultrasound and heat treatment caused significant variations in total polyphenols and flavonoid contents and altered the flavonoid composition of ***,rutin,kaempferol-3-o-rutinoside,and narcissoside of FSI converted to quercetin,kaempferol,and isorhamnetin during heating ***,the model experiment revealed that ultrasound treatment did not cause the conversion of flavones and just promoted the dissolution of FSI ***,quercetin,kaempferol,and isorhamnetin possessed better XOD and ADA inhibitory activities than rutin,kaempferol-3-o-rutinoside,and narcissoside at a concentration from 0.025 mg/mL to 1.0 mg/mL,implying de-glycosylation is a feasible approach for enhancing XOD and ADA *** present study provides a promising strategy for the processing of FSI.

关键词： Anti-xanthine oxidase activity Anti-adenosine deaminase activity Flos Sophorae Immaturus Flavones Ultrasound treatment Heating treatment

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Enhanced performance of field-effect transistors based on C_(60) single crystals with conjugated polyelectrolyte

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Science China Chemistry 2017年第4期60卷 490-496页

作者： Qinfen li Jiake Wu Ruihan Wu Yujing liu Hongzheng Chen Fei Huang Hanying li Key Laboratory of Macromolecular Synthesis and Functionalization Ministry of EducationState Key Laboratory of Silicon MaterialsDepartment of Polymer Science and EngineeringZhejiang University state Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSouth China University of Technology

Contact resistance at the interface between metal electrodes and semiconductors can significantly limit the performance of organic field-effect transistors, leading to a distinct voltage drop at the interface. Here, we demonstrate enhanced performance of n-channel field-effect transistors based on solution-grown C60 single-crystalline ribbons by introducing an interlayer of a conjugated polyelectrolyte （CPE） composed of poly[（9,9-bis（3＇-（（N,N-dimethyl）-N-ethylammonium）-propyl）-2,7-fluorene）- alt-2,7-（9,9-dioctylfluorene）] dibromide （PFN＋Br-）. The PFN＋Br- interlayer greatly improves the charge injection. Consequently, the electron mobility is promoted up to 5.60 cm2 V-1 s-1 and the threshold voltage decreased dramatically with the minimum of 4.90 V.

关键词： contact resistance C60 single crystal organic field-effect transistor solution process

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Integrated Au-Nanoroded Biosensing and Regulating Platform for Photothermal Therapy of Bradyarrhythmia

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Research 2022年第3期2022卷 31-44页

作者： Jiaru Fang Dong liu Dongxin Xu Qianni Wu Hongbo li Ying li Ning Hu state Key Laboratory of Optoelectronic Materials and Technologies Guangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologyState Key Laboratory of OphthalmologyZhongshan Ophthalmic CenterGuangdong Provincial Key Laboratory of Ophthalmology and Visual ScienceSun Yatsen UniversityGuangzhou 510006China Stoddart Institute of Molecular Science Department of ChemistryZJU-Hangzhou Global Scientific and Technological Innovation CenterZhejiang UniversityHangzhou 310058China Molecular Cancer Research Center School of MedicineSun Yat-sen UniversityShenzhen 518107China state Key Laboratory of Transducer Technology Chinese Academy of SciencesShanghai 200050China

Bradyarrhythmia is a kind of cardiovascular disease caused by dysregulation of cardiomyocytes,which seriously threatens human ***,treatment strategies of bradyarrhythmia mainly include drug therapy,surgery,or implantable cardioverter defibrillators,but these strategies are limited by drug side effect,surgical trauma,and instability of implanted ***,we developed an integrated Au-nanoroded biosensing and regulating platform to investigate the photothermal therapy of cardiac bradyarrhythmia in ***-nanoroded electrode array can simultaneously accumulate energy from the photothermal regulation and monitor the electrophsiological state to restore normal rhythm of cardiomyocytes in real *** treat the cardiomyocytes cultured on Au-nanoroded device by near-infrared(NIR)laser irradiation,cardiomyocytes return to normal for long term after irradiation of suitable NIR energy and *** with the conventional strategies,the photothermal strategy is more effective and convenient to regulate the ***,mRNA sequencing shows that the differential expression genes in cardiomyocytes are significantly increased after photothermal strategy,which are involved in the regulation of the heart rate,cardiac conduction,and ion *** work establishes a promising integrated biosensing and regulating platform for photothermal therapy of bradyarrhythmia in vitro and provides reliable evidence of photothermal regulation on cardiomyocytes for cardiological clinical studies.

关键词： arrhythmia return conduction

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Thermal History since the Paleozoic in the Eastern Qaidam Basin,Northwest China

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Acta Geologica Sinica(English Edition) 2019年第2期93卷 297-306页

作者： WANG li li Zongxing liU Chenglin PENG Bo FANGXinxin YUAN Guide Key Laboratory of Shale Oil and Gas Geological Survey Institute of Geomechanics Chinese Academy of Geological Sciences Institute of Geomechanics Chinese Academy of Geological Sciences state Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum PetroChina Qinghai Oilfield Company Branch of Petroleum Exploration

The Qaidam Basin is the one of the three major petroliferous basins in northeastern Tibetan Plateau, which has experienced multiphase superimposition and transformation. The study of thermal history not only plays an important role on revealing the tectonic origin of the Qaidam Basin and the forming mechanism and uplift history of the Tibetan Plateau,but also can provide scientific evidence for the assessment of oil and gas resources. This work used balanced cross-section technique and apatite fission track ages with modeling of fission track length distribution to infer that the eastern Qaidam Basin has experienced significant tectonic movement in the Early Jurassic movement(～200 Ma), which caused the carboniferous uplift and denudation, the geological movement in the Late Cretaceous, characterized by early stretching and late northeast-southwest extrusion; the Himalayan movement in multi-stage development in eastern Qaidam Basin, which can be divided into the early Himalayan movement(41.1–33.6 Ma) and the late Himalayan movement(9.6–7.1 Ma, 2.9–1.8 Ma), and large-scale orogeny caused pre-existing faults reactivated in late Himalayan movement. On the basis of burial history reconstruction, the thermal history of eastern Qaidam Basin was restored. The result shows that the thermal history in eastern Qaidam Basin shows slow cooling characteristics; the paleo-geothermal gradient of eastern Qaidam Basin was 38–41.5℃/km, with an average value of 39.0℃/km in the Late Paleozoic, 29–35.2℃/km, with an average value of 33.0℃/km in the Early Paleogene; the geothermal gradient of the Qaidam Basin increased in the Late Paleogene, which was similar to the present geothermal gradient in the Late Neogene. The characteristics of the tectono-thermal evolution since Paleozoic in the eastern Qaidam Basin are mainly controlled by magmatic thermal events in the study area.

关键词： thermal history balanced cross-sections technique fission track eastern Qaidam Basin

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In vitro xanthine oxidase inhibitory properties of Flos Sophorae Immaturus and potential mechanisms

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Food Bioscience 2022年第3期47卷 964-974页

作者： Jun li Yuhong Gong Jinwei li liuping Fan state Key Laboratory of Food Science & Technology Jiangnan University1800 Lihu AvenueWuxiJiangsu214122China School of Food Science and Technology Jiangnan University1800 Lihu AvenueWuxiJiangsu214122China Collaborat Innovat Ctr Food Safety & Qual Control Jiangnan University1800 Lihu AvenueWuxiJiangsu214122China Institute of Food Processing Technology Guizhou Academy of Agricultural SciencesGuiyang550006China

Flos Sophorae Immaturus (FSI) possessed potential xanthine oxidase (XO) inhibitory activity as a uric acid-lowing natural *** present work identified and quantified the free and bound polyphenols of FSI by *** determined the primary polyphenols with XO inhibitory effect and clarified their potential mechanisms by omission experiment,interaction assay,inhibition type,and fluorescence *** results revealed that nine polyphenols were detected in the free polyphenol extract and ten polyphenols were detected in the bound polyphenol ***,seven polyphenols were identified as XO inhibitors,including quercetin,kaempferol,isorhamnetin,rutin,hyperoside,protocatechuic acid,and quercitrin with the IC50 values of 0.03,0.11,0.07,5.62,11.48,22.13,and 367.82 mg/mL,but their inhibition stability was lower than 24 *** the content of quercetin (18.87 mg/g) was not the highest,it played a crucial role to the XO inhibitory effect of ***,kaempferol and isorhamnetin alone revealed the sub-additive effect with quercetin,while the combination of other polyphenols with quercetin generated the interference or antagonism ***,isorhamnetin,and kaempferol were mixed-type and competitive inhibitors,which significantly quenched the fluorescence intensity of ***,the binding processes of quercetin-XO,kaempferol-XO,and isorhamnetin-XO were spontaneous and endothermic,and the hydrophobic interaction was the key driving *** general,quercetin,kaempferol,and isorhamnetin in FSI can be used as potential XO inhibitors.

关键词： Polyphenols Flos sophorae immaturus Xanthine oxidase Interaction analysis Inhibition stability Fluorescence quenching

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