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Propagating subduction initiation of the Caroline Plate at the Mussau Trench

Science China Earth Sciences 2025年第1期68卷 253-269页

作者： chun-feng li Yongkang DENG Tao WU Dongdong DONG Guoliang ZHANG Jiazheng ZHANG Yutao liU Yaqing li Fugui TANG Lulu ZHANG Department of Marine Sciences Zhejiang University Laboratory of Marine Mineral Resources Laoshan Laboratory Key Lab of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Key Lab of Ocean and Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Science & Technology on Integrated Information System Lab Institute of Software Chinese Academy of Sciences

New seismic imaging from the Mussau Trench confirms that, under horizontal compression on an oceanic plate boundary, it is within the young and weak oceanic plate that a trench will develop, and it is the young plate, not so long after its birth, that starts to subduct toward the old plate. The Mesozoic Pacific Plate cannot easily bend, under the joint horizontal compression and vertical gravity pull, even with a pre-existing weak zone in place and with a large age offset across the plate boundary. The bending of the Caroline Plate near the northern end of the Mussau Trench started only after a long-time span of trench migration, and/or after a prolonged transition from initial compression to trench development. Highly contrasting trench deformation and sedimentary accretion between two parallel seismic sections support an evident migration of underthrusting or significant longitudinal heterogeneity along the trench. The swift transition from underthrusting to non-thrusting can be explained by a counter-clockwise rotation of the Caroline Plate. That miniature accretionary wedges develop even before the subduction initiates imply strong compression and uplifting before the underthrusting can kick-start. Rotation of the Caroline Plate have been halted as the Mussau Trench is seismically rather quiet and the Lyra Trough to the east shows relaxational extension.

关键词： Mussau Trench Subduction initiation Seismic reflection Caroline Plate

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SD-splittings for Some Bordered 3-Manifolds

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Acta Mathematica Sinica,English Series 2006年第5期22卷 1481-1484页

作者： feng chun LEI Yang li Department of Mathematics Harbin Institute of Technology Harbin 150001 P. R. China

In the present paper, we characterize the bordered 3-manifolds with genus 1 D-splittings and SD-splittings. We also describe a minimal genus SD-splitting for a handlebody and surface × I.

关键词： handlebody SD-splitting genus of SD-splitting

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Ellagic acid inhibits gastric cancer cells by modulating oxidative stress and inducing apoptosis

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Asian Pacific Journal of Tropical Biomedicine 2024年第4期14卷 162-169页

作者： Jian Zheng chun-feng li Department of Diagnostic Radiology Division Harbin Medical University Cancer HospitalHeilongjiangChina Department of Gastrointestinal Surgical Ward Harbin Medical University Cancer HospitalHeilongjiangChina

Objective:To evaluate the anticancer effect of ellagic acid on gastric cancer ***:MTT assay was used to evaluate the effect of ellagic acid at different concentrations(0.5-100μg/mL)on gastric cancer AGS ***-qPCR and Western blot analyses were applied to assess apoptosis(BCL-2,CASP-3,and BAX)and autophagy(LC3,ATG5,and BECN1)in AGS cells treated with ellagic *** expression of invasion-related markers including TP53,CDKN2A,and PTEN was *** addition,cell cycle markers including cyclin A,B,D,and E were measured by *** stress markers were evaluated using ***:Ellagic acid inhibited the proliferation of AGS cells in a concentration-and time-dependent *** expression of BCL-2 was significantly decreased(P0.05).Moreover,the oxidative stress markers including SOD,TAC,and MDA were increased by ellagic acid(Pliferation,induce apoptosis,and modulate oxidative stress in AGS ***,further in vivo and molecular studies are needed to verify its anticancer efficacy.

关键词： Ellagic acid Gastric cancer Apoptosis Autophagy Metastasis Proliferation

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Gravity modelling of crustal architecture and heterogeneity in the Nansha Block,South China Sea

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Journal of Oceanology and limnology 2023年第2期41卷 630-643页

作者： Jialing ZHANG Zhaocai WU chun-feng li Hailong li Key Laboratory of Submarine Geoscience Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Department of Marine Science Zhejiang UniversityZhoushan 316021China Sanya Institute Zhejiang UniversitySanya 572025China Laboratory of Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Key Laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao Institute of Marine GeologyQingdao 266071China

The stretched structure and heterogeneity of the crust of the Nansha Block,the southern continental margin of the South China Sea(SCS),are not well *** used published ocean bottom seismic(OBS)/multichannel reflection seismic(MCS)profiles across the Nansha Block to establish five two-dimensional crustal structure *** gravity modelling with magnetic anomaly inversion,we obtained the distribution of density and local magnetic susceptibility of the *** models show that the distribution of density and thickness of the upper crust in the Nansha Block is uneven,and the thick upper crust is prevalent in the regions close to the continent-ocean transition(COT)showing different *** interpreted Mesozoic granite blocks and Precambrian rigid basement reflects the heterogeneity in the material composition of the SCS continental *** on the thinning styles of different crustal layers,we suggest that the Nansha Block has a three-layer thinning *** uppermost pre-rift layer was deformed via brittle fractures,the upper crust was sheared by discrete shear zones,and the lower crust experienced ductile *** inherited pre-rift thermal regime,mechanical state,and material composition of the SCS continental margin affected the extensional structure of the crust.

关键词： Nansha Block crustal architecture gravity inversion crustal boudinage

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Wear properties of nonhydrogenated,hydrogenated,and dehydrogenated Ti6A14V alloy

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Rare Metals 2018年第7期37卷 574-578页

作者： Bao-Guo Yuan Hai-Ping Yu chun-feng li Dong-li Sun School of Materials Science and Engineering Hefei University of Technology Hefei 230009 China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

Wear properties of the nonhydrogenated, hydrogenated 0.5 wt%, and dehydrogenated Ti6Al4V alloys were studied through dry sliding wear tests using an M-200 type pin-on-disk wear testing machine in ambient air at room temperature to reveal the effects of hydrogen on wear properties of Ti6Al4V alloy. Morphology and chemical element of worn surface were investigated by means of scanning electron microscope （SEM） and energy dispersive spectroscopy （EDS）. Results show that hydrogen decreases the wear resistance of Ti6Al4V alloy. Wear rate of the Ti6Al4V alloy increases after hydrogenation. Wear rate increases by 244.3 % when 0.5 wt% hydrogen is introduced into a Ti6Al4V alloy. Wear rate of the dehydrogenated Ti6Al4V alloy recovers. Wear mechanisms of the nonhydrogenated, hydrogenated, and dehydrogenated Ti6Al4V alloys are determined. The nonhydrogenated Ti6Al4V alloy is controlled by oxidative wear. The hydrogenated Ti6Al4V alloy is dominated by abrasive wear. Wear mechanism of the dehydrogenated Ti6Al4V alloys is a mixture of oxidative wear and abrasive wear.

关键词： Titanium alloy Hydrogen Wear Mechanism

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Microstructural evolution in electroformed nickel shaped-charge liners with nano-sized grains undergone deformation at ultrahigh strain rate

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International Journal of Minerals,Metallurgy and Materials 2010年第5期17卷 617-623页

作者： feng Yang chun-hua li Sheng-wei Cheng Lei Wang Wen-huai Tian School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

Nickel shaped-charge liners with nano-sized grains were prepared by the electroforming technique, and the deformation at ultrahigh strain rate was performed by explosive detonation. The as-formed and post-deformed microstructures of electroformed nickel shaped-charge liners with nano-sized grains were observed by means of transmission electron microscopy, and the orientation distribution of the grains was analyzed by the electron backscattering pattern （EBSP） technique. The melting phenomenon in the jet fragment and the recovery and recrystallization in the slug after plastic deformation at ultrahigh-strain rate were observed in the ultrafine-grained nickel shaped-charge liners. The research evidence shows that dynamic recovery and recrystallization play an important role in plastic deformation at ultrahigh strain rate.

关键词： electroformed nickel nanosized plastic deformation electroformation microtexture dynamic recovery and recrystallization

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Design and performance analysis of wireless sensor network location node system for underground mine

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Mining Science and Technology 2009年第6期19卷 813-818页

作者： CHEN Guang-zhu SHEN chun-feng ZHOU li-juan School of Mechanical ＆ Electrical Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

Aiming at the application of a wireless sensor network to locating miners in underground mine,we design a wireless sensor network location node system,considering the communication performance and the intrinsic safety. The location node system consists of a mobile node,several fixed nodes,and a sink node,all of whose circuits were designed based on CC2430. A varistor and a RC circuit were used in the reset circuit of a sensor node to guarantee the intrinsic safety by reducing discharge energy,the theoretical analysis of the discharge energy shows that the reset circuit is an intrinsic safety one. The analysis and simulation about the performance of the location node system are discussed,such as network communication delay and packet loss rate,the results show that the highest network communication delay of the system is about 0.11 seconds,and the highest packet loss rate is about 0.13,which assures the location node system has a high reliability,and can locate miners in the underground mine.

关键词： wireless sensor network location node network communication delay packet loss rate

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Relationship between VEGF,EGF and Invasion,Metastasis of Gastric Cancer Cells

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Chinese Journal of Cancer Research 2009年第2期21卷 122-129页

作者： chun-feng li Yan Ma Yu-zhe Wei Ying-wei Xue Department of Abdominal Surgery Cancer Hospital Harbin Medical University Harbin 150081 China

Objective： To investigate the relationship between expression of vascular endothelial growth factor （VEGF）, epidermal growth factor （EGF） and the biological properties of gastric cancer cells such as invasion and metastasis. Methods： RT-PCR was performed to semi-quantitatively detect the mRNA expressions of EGF, EGFR, VEGF and VEGFR in four kinds of gastric cancer cell lines BGC823, MGCS03, HGC27 and SGC7901, which were classified by their differentiation degree in our experiment. We obtained cell line growth curves from MTT assays. The migration of gastric cancer cells was observed under inverted phase contrast microscope. The changes of invasion and adhesion were detected by a Transwell assay. Results： The growth rates slowed down sequentially in MGC803, HGC27, BGC823 and SGC7901（P〈 0.05）. The ability of migration, invasion and adhesion were reduced sequentially, and the difference was significant. The expressions of EGF, EGFR, VEGF and VEGFR were significantly stronger in MGCS03 and HGC27 than in BGC823 and SGC7901 cells, and the difference was statistically significant（P〈0.05）. Conclusion： The expressions of VEGF and EGF had close relationship with the properties of migration, adhesion and invasion of gastric cancer cells in vitro. Thus, targeting VEGF and EGF may be a potential therapeutic strategy for inhibiting peritoneal metastasis of gastric cancer.

关键词： Gastric cancer cells Vascular endothelial growth factor(VEGF) Epidermal growth factor(EGF),Metastasis

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The crustal nature of the northern Mozambique Ridge,Southwest Indian Ocean

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Acta Oceanologica Sinica 2021年第7期40卷 170-182页

作者： Nelta David Matsinhe Yong Tang chun-feng li Jiabiao li Estevão Stefane Mahanjane He li Yinxia Fang Institute of Marine Geology and Resources Zhejiang UniversityZhoushan 316021China Key Laboratory of Submarine Geosciences Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China School of Oceanography Shanghai Jiao Tong UniversityShanghai 200240China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China College of Marine Science and Technology China University of GeosciencesWuhan 430074China College of Marine Geosciences Ocean University of ChinaQingdao 266100China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Institute National Petroleum(INP) Maputo 4724Mozambique

The Mozambique Ridge(MOZR)is one of the basement high structures located in the Southwest Indian Ocean,parallel to the Southeast African continental *** was formed as a result of the tectono-magmatic evolution of the Gondwana *** origin of the MOZR has been highly debated,with models suggesting either continental or oceanic *** new free-air gravity anomaly and multichannel seismic(MCS)reflection data,we present results of 2D density modeling along two seismic profiles acquired by R/V Xiangyanghong 10 at the northern Mozambique Ridge(N-MOZR)between 26°S and 28°*** observed high free-air gravity anomaly and strong positive magnetic anomaly related to the emplaced seaward dipping reflectors(SDR)and high density lower crustal body(HDLCB),and high Bouguer gravity anomaly associated with the thinning of the continental crust underneath the N-MOZR over a distance of~82 *** suggests a thinned and intruded continental crust bound by the Mozambique Fracture Zone(MFZ)that is characterized by gravity low and negative magnetic *** fracture zone marks the continent-ocean boundary(COB)while the N-MOZR is the transform margin high,i.e.,marks the continent-ocean transition(COT)of the Southern Mozambique margin,following the definition of transform *** suggest that the N-MOZR was formed by continental extension and subsequent breakup of the MFZ,accompanied by massive volcanism during the southward movement of the Antarctica *** presence of SDR,HDLCB,and relatively thick oceanic crust indicates the volcanic nature of this transform margin.

关键词： crustal nature northern Mozambique Ridge seaward dipping reflection gravity modeling continent-ocean transition continent-ocean boundary

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Diode-Pumped Nanosecond Pulsed Laser with Pulse-Transmission-Mode Q-Switch

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Chinese Physics Letters 2001年第2期18卷 228-229页

作者： CHEN Fei HUO Yu-Jing HE Shu-Fang feng li-chun Department of Electronic Engineering Tsinghua UniversityBeijing 100084

Q-switched pulses at 1.064μm with a peak power of 5.02 kW and a pulse width of 2.8 ns were obtained which were pumped by a 1 W laser diode on the Nd:YVO4 microchip at the 1 kHz repetition *** values were achieved by combining the techniques of acousto-optic Q-switching and electro-optic pulse-transmission-mode *** temporal characteristics of the pulses were analysed *** experimental results are shown to be in good agreement with theoretical predictions.

关键词： pumped switched pulse

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