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spatial and temporal variations of sedimented organic matter in Xiaohai Lagoon,Hainan Island

Acta Oceanologica sinica 2012年第3期31卷 74-86页

作者： LIU Xingjian GE chendong Ministry of Education Key Laboratory for Coast and Island Development Nanjing UniversityNanjing 210093China school of Geographic and Oceanographic sciences Nanjing UniversityNanjing 210093China

The characteristics of grain-size,total organic carbon (TOC) and total nitrogen (TN) contents,TOC/TN ratios,stable carbon isotope (δ13C) and 210Pb dating were measured in six sediment cores from the Xiaohai *** results show distinct spatial and temporal variations in sedimentation *** sediments are dominated by clayey silt,sandy silt and by silty sand in the southern,middle lagoon and the northern lagoon,*** and TN contents decline from south to *** rates,determined by 210Pb dating,tend to decrease from south to ***,the determination of sedimentation rate in the north is *** spatial variations are related to the variations in sediment sources and hydrodynamic conditions in the Xiaohai *** variations of organic matter signatures can be divided into two stages in the cores from the southern and middle *** 1988,the organic matter signatures are relatively *** contribution of terrestrial organic carbon sources varies between 60％ and 85％.After 1988,the organic matter signatures demonstrate significant *** and TN contents increase rapidly,TOC/TN ratios decrease,δ13C values shift to higher and the contribution of terrestrial organic carbon sources decreases to 40％-50％.The contributions of phytoplankton organic matter have increased in the sediment since *** aquaculture activities have had a significant impact on organic matter signatures since *** sedimentation rates have increased rapidly in the southern and middle lagoon since 1988 due to the anthropogenic activities which include aquaculture,mining and *** activities have caused eutrophication and increased siltation in the southern and middle lagoon.

关键词： TOC TOC/TN ratios δ13C mean grain size sedimentation rate Xiaohai Lagoon

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Evidence of China's sea boundary in the south China sea

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Acta Oceanologica sinica 2017年第4期36卷 1-12页

作者： WANG Ying GE chendong ZOU Xinqing Collaborative Innovation Center of south China sea studies Nanjing University Nanjing 210023 China Ministry of Education Key Laboratory for Coast and Island Development Nanjing University Nanjing 210023 China

According to a series of important historical maps,i.e.,the Location Map of the south China sea Islands,the Nansha Islands,Zhongsha Islands,Xisha Islands,Yongxing Island and shidao Island,and Taiping Island（archived by the Territorial Administration Division of the Ministry of Interior of Republic of China in 1946）,and the Administration District Map of the Republic of China published in 1948,the dashed line surrounding the south China sea Islands represents China＇s sea boundary in the south China sea at that *** was both connected with,and an extension of,the land boundary of *** that time the dashed line was used to represent the waters boundaries while the solid line was used to represent the land boundary—a universal method used in maps that was then recognized *** above observation provides historical and scientific evidence of China＇s sea boundary in the south China sea that is useful for the international maritime delimitation over the south China sea area.

关键词： China's sea boundary historical maps maritime sovereignty south China sea

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Quartz-Hosted Fluid Inclusions Characteristics and Their Implications for Fluvial Deposits along the Changjiang River

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Journal of Earth science 2020年第3期31卷 571-581页

作者： Zhenqiang Ji chendong Ge Mengyang Zhou Nan Zhang Key Laboratory of Coast and Island Development(Nanjing University)of Ministry of Education Key Laboratory of Coast and Island Development ofJiangsu ProvinceSchool of Geography and Ocean ScienceNanjing UniversityNanjing 210023China

The characteristics of quartz-hosted fluid inclusions in fluvial sediments from five locations in the upstream,midstream,and estuary of the Changjiang River,China,are *** sources of sediments are discussed concerning their differences in the shape,size,number,gas percentage and genetic type of quartz-hosted fluid *** upstream to downstream,the characteristics of quartz-hosted fluid inclusions in sediments are *** fluid inclusion types in the samples from upstream to estuary are gradually *** sediment influx from the tributaries of the Changjiang River makes new types of quartz-hosted fluid inclusions in the downstream and *** terms of the number and size,most quartz-hosted fluid inclusions are concentrated in the range of 2-4μm in diameters and 10-150 in number per 10^-3 mm^*** number and size ranges of the fluid inclusions from different positions are also *** fluid inclusions in the sample collected from the shigu,upstream of the Changjiang River,are 2-18μm in size,with the number of 2-166 per 10^-3 mm^*** the samples collected from Yibin,Yichang and Wuhan,the sizes of fluid inclusions are 2-15,2-10,2-12μm,with the number of 1-270,2-220,and 1^-308 per 10^-3 mm^3,*** proportion of primary fluid inclusions in the sample of the upstream(14%)is higher than that of the midstream(6%-8%)and the estuary(5%),suggesting that different types of source rocks have been input into the river by the *** characteristics of quartz-hosted fluid inclusions in the fluvial sediments could offer a new perspective for exploration of the source of sediments.

关键词： quartz-hosted fluid inclusions morphological characteristics fluid inclusion types source of fluvial sediments Changjiang River

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Microstructure characterization and HCF fracture mode transition for modified 9Cr-1Mo dissimilarly welded joint at different elevated temperatures

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Journal of Materials science & Technology 2017年第12期33卷 1610-1620页

作者： chendong s.ao Fenggui Lu Xiongfei Wang Yuming Ding Zhuguo Li shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced ship and Deep-sea Exploration Shanghai 200240China shanghai Turbine Plant of shanghai Electric Power Generation Equipment Co.Ltd. Shanghai 200240China

The high cycle fatigue（HCF） tests of modified 9 Cr-1 Mo dissimilarly welded joint were carried out at different elevated temperatures and the fracture mechanism was systematically revealed. The fatigue strength at 108 cycles based on s-N curve can be estimated as a half of weld joint＇s yield strength for all conducted temperatures, which can be a reliable criterion in predicting the fatigue life. The results show that the inter-critical heat affected zones（IC-HAZs） of both sides are the weak zones due to their low hardness and inferior fatigue resistance property. HAZ of COsT-FB2（BM2） is the weakest zone at room temperature due to the existence of numerously distributed defects and the initiation of cracks, either in the surface or interior zone, impacting a crucial effect on the fatigue life of the joint. While at elevated temperatures, fatigue life was controlled mostly by the intrusion-extrusion mechanism at the specimen surface under high stress level and subsurface non-defect fatigue crack origin（sNDFCO） from the interior material under low stress amplitude. With increasing temperature, more and more fatigue failures began to occur at the HAZ of COsT-E（BM1） due to its higher susceptibility of temperature. Besides, it is found that the-ferrite in the BM1 has no harm to the HCF behavior of the joint at the conducted temperatures.

关键词： High cycle fatigue Dissimilarly welded joint Life time Fatigue failure Fracture mode

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Effect of Carbon Migration on Interface Fatigue Crack Growth Behavior in 9Cr/CrMoV Dissimilar Welded Joint

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Acta Metallurgica sinica(English Letters) 2022年第5期35卷 714-726页

作者： Qi Wang chendong s.ao Haichao Cui Yuan Gao Fenggui Lu shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China

Fatigue crack growth(FCG)behavior of 9 Cr/CrMoV dissimilar welded joint at elevated temperature and different stress ratios was *** was paid to the region near the fusion line of 9 Cr where carbon-enriched zone(CEZ)and carbon-depleted zone(CDZ)formed due to carbon migration during the welding *** and brittle tempered martensite dominated the stress ratio-insensitive FCG behavior in the coarse grain zone(CGZ)of 9 *** crack near the CGZ-CEZ interface,crack deflection through the CEZ and into the CDZ was observed,accompanied by an accelerating FCG *** with the severe plastic deformation near the secondary crack in 9 Cr-CGZ,the electron back-scattered diffraction analysis showed less deformation and lower resistance in the direction toward the brittle CEZ,which resulted in the transverse *** spite of the plastic feature in CDZ revealed by fracture morphology,the less carbides due to carbon migration led to lower strength and weaker FCG resistance property in this *** conclusion,the plasticity deterioration in CEZ and strength loss in CDZ accounted for the FCG path deflection and FCG rate acceleration,respectively,which aggravated the worst FCG resistance property of 9 Cr-HAZ in the dissimilar welded joint.

关键词： Fatigue crack growth Dissimilar welded joint Carbon migration Crack transverse deflection Carbonenriched zone

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Measuring Viscoelastic Properties of Living Cells

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Acta Mechanica solida sinica 2019年第5期32卷 599-610页

作者： Yang Bu Long Li chendong Yang Rui Li Jizeng Wang Key Laboratory of Mechanics on Disaster and Environment in Western China Ministry of EducationCollege of Civil Engineering and MechanicsLanzhou UniversityLanzhou 730000China

Precise measurement of mechanical properties of living cells is important in understanding their mechanics-biology *** this study,we adopted the atomic force microscope to measure the creep deformation and stress relaxation of six different human cell *** examined whether the measured creep and relaxation trajectories satisfy a verification relation derived based on the linear viscoelastic *** compared the traditional spring-dashpot and the newly developed power-law-type constitutive relations in fitting the experimental *** found that the human normal liver(L02),hepatic cancer(HepG2),hepatic stellate(LX2)and gastric cancer(NCI-N87)cell lines are linear viscoelastic materials,and human normal gastric(GEs-1)and gastric cancer(sGC7901)cell lines are nonlinear due to failing in satisfying the verification relation for linear viscoelastic *** three-parameter power-law-type const计utive relation can fit the experimentai measurements better than that of the five-parameter classical spring-dashpot.

关键词： Atomic force microscope Living cells Linear viscoelasticity Creep Relaxation

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sYNTHEsIs OF HYPERBRANCHED CONJUGATIVE POLY(ARYLENEETHYNYLENE)s BY ALKYNE POLYCYCLOTRIMERIZATION

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Chinese Journal of Polymer science 2005年第1期23卷 1-3页

作者： HanPeng Rong-huaZheng Hong-chendong De-minJia Ben-zhongTangb DepartmentofChemistry TheHongKongUniversityofScience＆TechnologyClearWaterBayKowloonHongKongChina InstituteofMaterialscienceandEngineering SouthChinaUniversityofTechnologyGuangzhou510641China

A series of new hyperbranched poly(aryleneethynylene)s are synthesized by the copolycyclotrimerizations oftetraynes(Ⅰand Ⅱ)with aliphatic monoynes(A-C)catalyzed by tantalum-,niobium-,and cobalt-based *** thereactions proceed smoothly and soluble polymers of high molecular weights(M_w up to 3.8×10~4)are obtained in high yields(up to 97%).

关键词： Polycyclotrimerization Hyperbranched polymers Poly(aryleneethynylene)s.

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In situ DIC study on LCF Behavior of Retired Weld Joint subjected to Prolonged service at Elevated Temperature

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Acta Metallurgica sinica(English Letters) 2022年第8期35卷 1317-1328页

作者： Anqi Zuo Xia Liu chendong s.ao Mingzhe Fan Ninshu Ma Fenggui Lu shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong University Shanghai 200240China shanghai Turbine Plant of shanghai Electric Power Generation Equipment Co.Ltd.shanghai 200240 China Joining and Welding Research Institute Osaka UniversityOsaka 567-0047.Japan

By using digital image correlation(DIC), low-cycle fatigue(LCF) behavior of CrMoV weld joint taken from a retired gas turbine rotor after 15-year service was investigated at 500 ℃ and 540 ℃. The most remarkable plastic strain was observed in the weld metal(WM), which was up to 6 times of the global strain at mid-life cycle. Due to the cyclic accumulation of local deformation, the stress–strain hysteresis loops relative to tensile or compressive strain concentration area in WM displayed the ratchetting shape. The local deformation accumulation of WM was attributed to the effect of the equiaxed grain zone near the WM center. The accumulated plastic strain was considered as the main fatigue failure mechanism.

关键词： Low-cycle fatigue Digital image correlation Local deformation Weld joint Failure mechanism

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Numerical Investigation on Fracture Initiation Properties of Interface Crack in Dissimilar steel Welded Joints

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Chinese Journal of Mechanical Engineering 2020年第3期33卷 142-149页

作者： Longfei Zhao chendong s.ao Yasuhito Takashima Fumiyoshi Minami Fenggui Lu shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghaiChina Joining and Welding Research Institute Osaka UniversityOsakaJapan

Fracture toughness property is of significant importance when evaluating structural *** current research of fracture toughness mainly focused on crack in homogeneous material and experimental *** the crack is located in a welded joint with high-gradient microstructure and mechanical property distribution,it becomes difficult to evaluate the fracture toughness behavior since the stress distribution may be affected by various *** recent years,numerical method has become an ideal approach to reveal the essence and mechanism of fracture toughness *** study focuses on the crack initiation behavior and driving force at different interfaces in dissimilar steel welded *** stress and strain fields around the crack tip lying at the interfaces of ductile-ductile,ductile-brittle and brittle-brittle materials are analyzed by the numerical *** the interface of ductile-ductile materials,the strain concentration on the softer material side is responsible for ductile fracture *** the ductile-brittle interface,the shielding effect of the ductile material plays an important role in decreasing the fracture driving force on the brittle material *** the case of brittle-brittle interface,a careful matching is required,because the strength mismatch decreases the fracture driving force in one side,whereas the driving force in another side is *** results are deemed to offer support for the safety assessment of welded structures.

关键词： Dissimilar steel welded joint Fracture initiation Interface strength mismatch Numerical simulation

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Modulating planarity of cyanine dye to construct highly stable Haggregates for enhanced photothermal therapy

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Nano Research 2023年第1期16卷 970-979页

作者： Kai Wei Yanxin Wu Pengyu Li Xian Zheng chendong Ji Meizhen Yin state Key Laboratory of Chemical Resource Engineering Beijing Laboratory of Biomedical MaterialsBeijing University of Chemical TechnologyBeijing 100029China

self-assembly of dyes has become a flexible strategy to modulate their photophysical properties.H-aggregates show great potential to increase heat generation,while the precise designing of H-aggregates as efficient photothermal agents is still ***,a quinoline cyanine(QCy)is developed for constructing stable H-aggregated nanoparticles(NPs)to significantly enhance photostability and photothermal conversion efficiency(PCE).With symmetrical rigid planar quinoline structures,QCy has a small and symmetrical dihedral angle(11.9°),which ensures excellent molecular *** aqueous solution,the planar QCy can form closeπ–πmolecular stacking,and fast self-assemble into stable H-aggregates even at low concentrations(1×10−7 M).QCy H-aggregates are sphere-like NPs(QCy NPs)with an average diameter of 120 nm and exhibit high stability.H-aggregation of QCy significantly enhances PCE from 20.1%(non-H-aggregated QCy)to 63.8%(QCy NPs).In addition,the positive charge of quaternarized quinoline provides mitochondrial anchoring ability,which further enhances the photothermal *** high PCE and tumor accumulation,QCy NPs in low-doses have been successfully used in photoacoustic imaging-guided tumor photothermal therapy.

关键词： H-aggregation-enhanced photothermal effect molecular planarity quinoline cyanine mitochondrial anchoring low-dose

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