检索结果-南通市图书馆

Earth and Planetary Physics 2022年第4期6卷 305-312页

作者： jun wu jian wu IHaggstrom Tong Xu ZhengWen Xu YanLi Hu National Key Laboratory of Electromagnetic Environment China Research Institute of Radio Wave PropagationBeijing 102206China European Incoherent Scatter Scientific Association(EISCAT) KirunaSE-98192Sweden

Analysis of Incoherent Scatter Radar(ISR)data collected during an experiment involving alternating O/X mode pumping reveals that the high-frequency enhanced ion line(HFIL)and plasma line(HFPL)did not appear immediately after the onset of pumping,but were delayed by a few seconds.By examining the initial behaviors of the ion line,plasma line,and electron temperature,as well as ionosphere conditions,we find that(1)the HFIL and HFPL were delayed not only in the X mode pumping but also in the O mode pumping and(2)the HFIL was not observed prior to enhancement of the electron temperature.Our analysis suggests that(1)leakage of the X mode to the O mode pumping may not be ignored and(2)spatiotemporal uncertainties and spatiotemporal variations in the profiles of ion mass and electron density may have played important roles in the apparent failure of the Bragg condition to apply;(3)nevertheless,the absence of parametric decay instability(PDI)cannot be ruled out,due to our inability to match conditions caused by the spatiotemporal uncertainties.

关键词： Incoherent Scatter Radar(ISR) ion line plasma line active ionosphere X/O mode

Palladium-catalyzed carbonylative cyclization of alkene-tethered indoles with phenols or arylboronic acids:Construction of carbonyl-containing indolo[2,1-a]isoquinoline derivatives

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第5期34卷 259-262页

作者： Siqi Wang jian-Shu Wang jun Ying Xiao-Feng wu Department of Chemistry Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang ProvinceZhejiang Sci-Tech UniversityHangzhou 310018China Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Leibniz-Institut für Katalyse e.V. Albert-Einstein-Straβe 29aRostock 18059Germany

A novel palladium-catalyzed carbonylative cyclization of alkene-tethered indoles with phenols or arylboronic acids is described,which provides a facile approach to access indolo[2,1-a]isoquinoline scaffolds.This method employs benzene-1,3,5-triyl triformate(TFBen)as the CO surrogate for the incorporation of a carbonyl group into indolo[2,1-a]isoquinoline scaffolds,and a variety of carbonyl-containing indolo[2,1-a]isoquinoline derivatives are prepared in good yields.

关键词： Carbonylative cyclization Palladium catalysis Indolo[2 1-a]isoquinolines Alkene-tethered indoles Phenols Arylboronic acids

Adsorption and desorption of steroid hormones on saline soil

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2022年第11期16卷 177-190页

作者： Jie wu jian Lu jun wu CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China Shandong Key Laboratory of Coastal Environmental Processes Yantai 264003China University of Chinese Academy of Sciences Beijing 100049China Yantai Research Institute Harbin Engineering UniversityYantai 264006China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Soil organic matter content was the main driving factor affecting adsorption and desorption process of 17β-estradiol(E2)and 17α-ethynylestradiol(EE2)on saline soil.The adsorption and desorption of E2 and EE2 on three saline soils showed the similar behavior that soil with the highest organic content possessed the highest adsorption capacity and the lowest desorption capacity for E2 and EE2.The adsorption capacity of untreated soil samples(with organic matter)was larger than that of soil samples without organic matter.For soil with the largest adsorption capacity,adsorption capacity of E2/EE2 on the untreated soil and soil colloid(with organic matter)respectively reached 0.15/0.30μg/g and 0.16/0.33μg/g while the soil and soil colloid without organic matter hardly adsorbed pollutants.The adsorption capacity of E2/EE2 at the initial concentration of 100μg/L was 25/15 times higher than that at the initial concentration of 5μg/L.E2 and EE2 had the same adsorption sites on saline soil while EE2 possessed higher competition intensity for adsorption sites than E2.Pseudo-first-order model(R^(2)=0.995–0.986)and Langmuir model(R^(2)=0.989–0.999)could better fit the adsorption process of E2 or EE2.The thermodynamic study further showed that the adsorption of E2/EE2 on saline soil was a spontaneous exothermic process.The desorption capacity of EE2/E2 accounted for 40%/78%of the total adsorption capacity to possibly exert potential risk to the groundwater.The variation of the salinity led to the variation of soil organic carbon which subsequently changed the adsorption and desorption behaviors of endocrine disrupting chemicals in coastal saline soil.This study provides a new insight on the interfacial behavior of endocrine disrupting chemicals on saline soil.

关键词： Saline soil Steroid hormones Adsorption Desorption Soil organic matter

Geochemical signatures and human health risk evaluation of rare earth elements in soils and plants of the northeastern Qinghai-Tibet Plateau,China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Arid Land 2022年第11期14卷 1258-1273页

作者： LI Leiming wu jun LU jian ZHANG Xiying XU Juan Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China Yantai Research Institute Harbin Engineering UniversityYantai 264006China CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China Shandong Key Laboratory of Coastal Environmental Processes Yantai 264003China Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes Xining 810008China State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China

Information on rare earth elements(REEs)in soils and plants of the Qinghai-Tibet Plateau is very limited.Therefore,in this study,we performed field sampling to explore the geochemical signatures and human health risk of REEs in soils and plants of the northeastern Qinghai-Tibet Plateau,China.A total of 127 soil samples and 127 plant samples were collected from the northeastern Qinghai-Tibet Plateau to acquire the geochemical signatures and related human health risks of REEs.The mean total concentrations of REEs in soils and plants of the study area reached 178.55 and 10.06 mg/kg,respectively.The light REEs in soils and plants accounted for 76%and 77%of the total REEs,respectively.REEs showed significantly homogenous distribution in soils but inhomogeneous distribution in plants of the study area.Characteristic parameters indicated that light REEs were enriched and fractionated significantly,while heavy REEs were moderately fractionated in soils and plants.REEs in soils and plants showed significantly negative Europium anomaly.Cerium showed slightly positive anomaly in plants and slight anomaly in soils.The normalized distribution patterns of REEs were generally similar in the analyzed soils and the corresponding plants of the study area.The average bio-concentration factor of REEs ranged from 0.0478(Scandium)to 0.0604(Europium),confirming a small accumulation of REEs by plants.Health risks caused by REEs in soils and plants were negligible,while risks for adults were lower than those for children.This study provides important information on REEs in soils and plants of the northeastern Qinghai-Tibet Plateau.

关键词： rare earth elements geochemical signatures human health risk carcinogenic risk bio-concentration factor Qinghai-Tibet Plateau

Effect of gastric fluid on adsorption and desorption of endocrine disrupting chemicals on microplastics

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2022年第8期16卷 193-205页

作者： Jie wu jian Lu jun wu CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation Yantai Institute of Coastal Zone Research(YIC)Chinese Academy of Sciences(CAS)Shandong Key Laboratory of Coastal Environmental ProcessesYICCASYantai 264003China University of Chinese Academy of Sciences Beijing 100049China Yantai Research Institute Harbin Engineering UniversityYantai 264006China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Microplastics and endocrine disrupting chemicals are emerging pollutants in the marine environment because of their potential hazards.The effect of gastric fluid on the adsorption and desorption of 17β-estradiol(E2)and 17α-ethynylestradiol(EE2)to microplastics was investigated.The adsorption and desorption isotherms of E2/EE2 on microplastics could be well fitted by the Freundlich model while the Gibbs free energy of these processes were negative,proving that the reaction occurred spontaneously on the heterogeneous surface of the microplastics.Desorption ratios of EE2(55%–59%)on PVC were larger than that of E2(49%–55%)to indicate that EE2 was less stable in gastric fluid,which could be explained by the fact that the hydrophobicity of EE2 was greater than E2.E2/EE2 were more easily desorbed from PVC in the gastric fluid and the desorption amount(5.25–12.91/7.19–17.86μg/g)increased by 2.51 times in comparison with that in saline solution(2.22–7.81/2.87–10.80μg/g).The decrease of pH and the increase of ionic strength in gastric fluid could further strengthen desorption of E2/EE2 from PVC.The promotion of gastric juice on desorption of PVC was achieved by reducing the hydrophobicity of the PVC surface.The desorption rate of E2/EE2 at 18°C and 38°C was respectively 44%–47%/46%–50%and 49%–55%/56%–59%,indicating that PVC loaded with E2/EE2 had a relatively greater risk of releasing pollutants in the gastric fluid of constant temperature marine organisms while higher temperatures exposed higher hazards for variable temperature animals.The interaction between microplastics and pollutants might be mainly hydrophobic interaction.

关键词： Microplastics Gastric fluid Endocrine-disrupting chemicals Adsorption Desorption

Surface coatings of two-dimensional metal-organic framework nanosheets enable stable zinc anodes

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2022年第11期65卷 2205-2213页

作者： Liling Lei Feifan Chen Yulun wu jian Shen Xue-jun wu Shishan wu Shuai Yuan State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical EngineeringNanjing UniversityNanjing210093China National and Local Joint Engineering Research Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing210023China jiangsu Engineering Research Center of Interfacial Chemistry Nanjing UniversityNanjing 210093China

Aqueous zinc-ion batteries (ZIBs) have been considered as safe and scalable energy storage solutions,but the dendrite and corrosion issues of Zn anodes have hindered their further application.Herein,we demonstrate that two-dimensional metalorganic framework (MOF) nanosheets can act as protective coatings to prevent dendrite formation and hydrogen evolution of Zn anodes.The morphology of MOFs was tuned from octahedral nanoparticles (UiO-67-3D) to nanosheets (UiO-67-2D),leading to significantly enhanced protective performance.UiO-67-2D nanosheets-coated Zn anodes displayed smaller polarization,longer cycling lifetime and lower H_(2) evolution than those of UiO-67-3D nanoparticles in symmetrical cells,which has been attributed to the higher concentration of surface Zr-OH/H_(2)O to induce uniform Zn deposition and one-dimensional (1D) channels perpendicular to the Zn surface to regulate Zn^(2+) diffusion.The assembled UiO-67-2D@Zn||Mn_(2)O_(3)/C full cell shows a high capacity of240 m Ah g^(-1)at 1 A g^(-1) and excellent cycling stability.

关键词： metal-organic frameworks nanosheets zinc-ion battery zinc anode

The nature of electron density enhancement over a wide altitude range during ionosphere heating experiments at EISCAT

在线全文

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2024年第2期8卷 408-414页

作者： jun wu jian wu Jie Feng QingLiang Li ShuJi Hao ZhengWen Xu HaiSheng Zhao YaBin Zhang National Key Laboratory of Electromagnetic Environment China Research Institute of Radio Wave PropagationBeijing 102206China School of Physics Xidian UniversityXi’an 710071China

During the course of ionospheric heating experiments, researchers at the European Incoherent Scatter Scientific Association (EISCAT) observed an apparent electron density enhancement. The enhancement extended over a wide range of altitudes, above the reflection altitude of the high-frequency pump wave. However, whether this enhancement actually corresponds to a true enhancement in electron density remains an open question. When the dispersion relation of ion acoustic waves is followed, the frequency ratio of the enhanced ion line to the background ion line suggests that the profile of the effective ion mass may have remained unchanged. Furthermore, the solar radio flux and ion drift velocity indicate no significant changes in the ion species and their densities. In conclusion, the electron density enhancement observed at EISCAT should not, in fact, be considered a true enhancement.

关键词： incoherent scatter radar(ISR) ionospheric heating electron density ion acoustic wave

Toll of Mental Disorders: TLR-Mediated Function of the Innate Immune System

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2019年第4期35卷 771-774页

作者： jian-Feng Liu Ruyan wu jun-Xu Li Department of Pharmacology and Toxicology University at Buffalo Buffalo NY 14214 USA School of Medicine Yangzhou University Yangzhou 225000 China

Mental disorder is defined as a syndrome characterized by clinically significant disturbance in an individual’s cognition, emotion, or behavior that reflects a dysfunction in the psychological, biological, or develop... 详细信息

关键词： Mental Disorders TLR-Mediated Function Innate Immune System

A Comparative Study on Hydrodynamics and Hydrochemistry Coupled Simulations of Drainage Pipe Crystallization Blockage in Karst Tunnels

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2022年第5期33卷 1179-1189页

作者： Dian-Guang Liu Yun Yang Cheng-jun Mao jian-Feng wu Ji-Chun wu School of Earth Sciences and Engineering Hohai UniversityNanjing211100China Key Laboratory of Surficial Geochemistry Ministry of EducationDepartment of HydrosciencesSchool of Earth Sciences and EngineeringNanjing UniversityNanjing210023China

Drainage pipe system is the requisite component of the traffic tunnels in Karst area.To reveal the dynamic process of crystallization blockage in drainage pipes,a novel hydrodynamics and hydrochemistry coupled simulation model was developed for calculating the deposition rate of CaCO_(3) fouling in pipeline surface.Sediments adhering to the pipe walls involve a deformable domain with moving geometric boundaries,and moving mesh and level set methods are proposed for simulation of for tunnel turbulence and crystallization fouling process.The simulation results are compared with the experimental results showing similar trend.The effects of temperature,flow velocity,and solution concentration on crystallization blockage were analyzed by comparative simulation studies.The simulation results show that:(1)the moving mesh method simulated nozzle shrinkage caused by crystalline deposition,without accounting for geometric topology shape changes.However,the level set method tracked the moving topology and thus can simulate the process of complete blockage;(2)the flow velocity in the longitudinal pipe generally exceeded that in the transverse pipe,and the CaCO_(3) crystal concentration in the transverse pipe eclipsed that in the longitudinal pipe,which meant crystallization blockages primarily occurred in the transverse pipe;(3)the temperature and concentration correlated positively with the crystallization rate,while the crystal precipitation value decreases with the increasing of inlet flow velocity increases.This study advances a hydrodynamics and hydrochemistry coupled crystallization blockage model to provide technical support for the early identification of crystallizationinduced pipe blockage in the drainage system in karst tunnel sites.

关键词： karst tunnel crystallization blockage numerical simulation moving mesh level set engineering geology

Metagenomic analysis on resistance genes in water and microplastics from a mariculture system

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2022年第1期16卷 77-89页

作者： jian Lu jun wu jianhua Wang CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation Yantai Institute of Coastal Zone Research(YIC)Chinese Academy of Sciences(CAS)Shandong Key Laboratory of Coastal Environmental ProcessesYICCASYantai 264003China Yantai Research Institute Harbin Engineering UniversityYantai 264006China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Microplastics existing widely in different matrices have been regarded as a reservoir for emerging contaminants.Mariculture systems have been observed to host microplastics and antibiotic resistance genes(ARGs).However,more information on proliferation of ARGs and metal resistance genes(MRGs)in mariculture system at the presence of microplastics is needed.This study used metagenomic analysis to investigate the distribution of ARGs and MRGs in water and microplastics of a typical mariculture pond.Total 18 types including 174 subtypes of ARGs were detected with the total relative abundances of 1.22/1.25 copies per 16S rRNA copy for microplastics/water.Chloramphenicol resistance genes were the dominant ARGs with the abundance of 0.35/0.42 copies per 16S rRNA copy for microplastics/water.Intergron intI1 was dominant gene among 6 detected mobile genetic elements(MGEs)with the abundance of 75.46/68.70 copies per 16S rRNA copy for water/microplastics.Total 9 types including 46 subtypes of MRGs were detected with total abundance of 5.02×10^(2)/6.39×10^(2)copies per 16S rRNA copy for water/microplastics while genes resistant to copper and iron served as the dominant MRGs.Proteobacteria,Bacteroidetes,and Actinobacteria accounted for 84.2%/89.5%of total microbial community in microplastics/water.ARGs with relatively high abundance were significantly positively related to major genera,MGEs,and MRGs.Microplastics in mariculture system could enrich most of MRGs and some ARGs to serve as potential reservoir for these pollutants.The findings of this study will provide important information on resistance gene pollution at presence of microplastics in the mariculture system for further proposing suitable strategy of environmental management.

关键词： Antibiotic resistance genes Metal resistance genes Metagenomic analysis Microplastics Mariculture