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Geochronological and geochemical constraints on the petrogenesis and geodynamic process of Hemler,Vlinder,and Il'ichev seamount lavas in NW Pacific

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Science China Earth Sciences 2024年第6期67卷 1856-1871页

作者： Xun WEI Yan ZHANG Xuefa SHI Hui ZHANG Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory for Marine Geology Qingdao Marine Science and Technology CenterQingdao 266237China Shandong Key Laboratory of Deep Sea Mineral Resources Development(Preparatory) Qingdao 266061China

Oceanic intraplate volcanoes with linear age progressions are usually accepted to be derived from melting of an upwelling mantle *** seamount groups in NW Pacific,however,show complex age-distance relationships that are difficult to explain using the classic“mantle plume hypothesis”,and thus their origins are *** this study,we present ^(40)Ar-^(39)Ar age,geochemical,and Sr-Nd-Pb-Hf isotopic data of lavas from Hemler,Vlinder,and Il’ichev seamounts in NW Pacific,to elucidate their petrogenesis and geodynamic *** lavas from Hemler,Vlinder,and Il’ichev seamounts are classified as alkali basalt,basanite/nephelinite,and *** with Mg O>8 wt.%exhibit high contents of CaO,FeO^(T),and TiO_(2),similar to the composition of melts formed from reaction between carbonated eclogite-derived melts and fertile *** lavas have elevated Zr/Hf ratios(40.6-45.2)and negative Zr and Hf anomalies,indicating the presence of a carbonate component in the mantle *** are enriched in incompatible trace elements and have enriched mantle 1(EM1)-like SrNd-Pb-Hf isotopic *** isotopic compositions of Vlinder,Il’ichev basanite,and Hemler lavas in this study are similar to the Rarotonga *** occurring at the same seamount,the Il’ichev alkali basalts display more depleted SrNd-Hf isotopic compositions compared to Il’ichev *** to plate tectonic reconstruction results,the ages of Hemler(100.1 Ma),Vlinder pre-(100.2 Ma)and post-shield(87.5 Ma),and Il’ichev(56.4 Ma)lavas clearly deviate from the Macdonald,Arago,Rarotonga,and Samoa hotspot tracks,indicating that they cannot directly originate from mantle *** propose that in the mid-Cretaceous,when the Pacific plate passed over Rarotonga hotspot,melting of Rarotonga plume formed the Vlinder(main-shield stage),Pako,and Ioah *** Rarotonga(and possibly Samoa)plume materials would have been dispersed into the surrounding asthenosphere by mantle conve

关键词： Mantle plume Magellan seamount trail Carbonated mantle component Hotspot Lithosphere extension

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Distribution, burial fluxes and carbon sink effect of sedimentary organic carbon in the eastern China seas

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Science China Earth Sciences 2024年第10期67卷 3062-3082页

作者： Xuefa SHI Bin WU Shuqing QIAO Zhengquan YAO Limin HU Yazhi BAI Shan HU Jie SHENG Yanguang LIU Shengfa LIU Kunshan WANG Jianjun ZOU Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory for Marine Geology Qingdao Marine Science and Technology CenterQingdao 266237China Key Laboratory of Deep Sea Mineral Resources Development Shandong Province(Preparatory)Qingdao 266061China Key Laboratory of Submarine Geosciences and Technology College of Marine GeosciencesOcean University of ChinaQingdao 266100China

The ocean is the largest active carbon reservoir on Earth. Organic carbon(OC), as the primary species of carbon sequestration in the ocean, plays an important role in the global carbon cycle through its deposition and burial. In this study,sedimentary OC data from 5796 stations, together with relevant geochemical and sedimentological parameters in the Bohai sea,Yellow sea, and East China sea(BYES) were used to summarize and elucidate the distribution and burial patterns of sedimentary OC, and assess carbon sink effect of sedimentary OC burial. The results show that the OC content in the sediments of the BYES ranges from 0.00% to 2.12%, with an average content of 0.47%±0.26%. OC content is significantly correlated with finegrained sediments, with an average OC content in mud areas being 39% higher than that in non-mud areas. Modern OC buried in the BYES are mainly deposited in 7 major mud areas, with a total sedimentary OC burial flux of approximately 8.20 Mt C yr^(–1).Among them, the burial flux of biospheric OC is 6.92 Mt C yr^(–1), equivalent to the OC consumption amount of silicate weathering of the 9 major river basins in the eastern China. In its natural state, the annually sequestered OC in the sediments of the eastern China seas is equivalent to 25.37 Mt of atmospheric CO_(2), indicating a significant carbon sink effect. The distribution and burial of terrigenous OC in the BYES are mainly influenced by the large river inputs and complex marine hydrodynamic environment,while human activities such as dam construction have significantly altered the OC burial in these coastal mud areas.

关键词： Sedimentary organic carbon Burial flux Carbon sink effect Carbon cycle Eastern China seas

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A SiC asymmetric cell trench MOSFET with a split gate and integrated p^(+)-poly Si/SiC heterojunction freewheeling diode

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Chinese Physics B 2023年第5期32卷 697-704页

作者：蒋铠哲张孝冬田川张升荣郑理强赫荣钊沈重 State Key Laboratory of Marine Resource Utilization in South China Sea Hainan UniversityHaikou 570228China Institute of Deep-Sea Science and Engineering Chinese Academy of SciencesSanya 572000China Sansha Guohaixintong Technology Development Co. LtdHaikou 570100China

A new SiC asymmetric cell trench metal–oxide–semiconductor field effect transistor(MOSFET)with a split gate(SG)and integrated p^(+)-poly Si/SiC heterojunction freewheeling diode(SGHJD-TMOS)is investigated in this *** SG structure of the SGHJD-TMOS structure can effectively reduce the gate-drain capacitance and reduce the high gateoxide electric *** integrated p^(+)-poly Si/SiC heterojunction freewheeling diode substantially improves body diode characteristics and reduces switching losses without degrading the static characteristics of the *** analysis results show that,compared with the conventional asymmetric cell trench MOSFET(CA-TMOS),the high-frequency figure of merit(HF-FOM,R_(on,sp)×Q_(gd,sp))is reduced by 92.5%,and the gate-oxide electric field is reduced by 75%.In addition,the forward conduction voltage drop(V_(F))and gate-drain charge(Q_(gd))are reduced from 2.90 V and 63.5μC/cm^(2) in the CA-TMOS to 1.80 V and 26.1μC/cm^(2) in the SGHJD-TMOS,*** with the CA-TMOS,the turn-on loss(E_(on)) and turn-off loss(E_(off)) of the SGHJD-TMOS are reduced by 21.1%and 12.2%,respectively.

关键词： split gate(SG) heterojunction freewheeling diode(HJD) SiC asymmetric cell trench MOSFET turn-on loss turn-off loss

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On electro-acoustic characteristics of a marine broadband sparker for seismic exploration

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Journal of Oceanology and Limnology 2024年第3期42卷 760-771页

作者： Jing LI Kai LIU Liancheng ZHANG Chenguang LIU Yanliang PEI Baohua LIU Key Laboratory of Marine Geology and Metallogency First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory of Marine Geology Laoshan LaboratoryQingdao 266237China Key Laboratory of Fluid Transmission Technology of Zhejiang Province Zhejiang Sci-Tech UniversityHangzhou 310018China Key Laboratory of Submarine Acoustic Investigation and Application of Qingdao(Preparatory) Qingdao 266061China Key Laboratory of Deep Sea Mineral Resources Development Shandong(Preparatory)Qingdao 266061China

The construction of major marine infrastructure projects and the exploration and development of deep-sea mineral resources require fine imaging of seabed strata and *** highresolution marine seismic exploration based on a high broadband sparker source is an important approach to reveal seabed stratum and reservoir structure,and identify *** optimize the performance of sparker seismic source,we investigated the electro-acoustic characteristics of spark discharge under conditions of different charging voltages and electrode *** show that the sound source level increased with the increase of the charging voltage,whereas the main frequency decreased when the charging voltage *** addition,it was found that the charging capacitance had more obvious influence on the main frequency than the sound source level *** the load energy decreased with increasing electrode number,the sound source level still increased but the main frequency ***,the primary to bubble(P/B)ratio increased with the increase of the electrode *** gain a deeper insight into the electro-acoustic characteristics,we investigate the relationship between sound source level and power peak,from which a good correlation was observed.A more practical statistical analysis on the rise rate of current was processed,and a perfect logarithmic function was ***,we found that the main frequency was most possibly subjected to the electrical energy,especially the charging energy per *** results indicate that the charging energy per electrode less than 10 J could increase the main frequency to above 300 *** last,the main frequency could be reduced to 20 Hz when the charging energy of a single-electrode discharge was enhanced to over 4 *** study shall be helpful in developing a sparker seismic source and improving the performance for marine engineering exploration and geohazard assessment.

关键词： high-resolution marine seismic exploration sparker seismic source sound source level main frequency electro-acoustic characteristics

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Influence on the Solid−Liquid Two-Phase Flow from Cross-Section Area of Slurry Pumps for deep-sea Mining

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China Ocean Engineering 2022年第3期36卷 439-450页

作者： WANG Run-kun ZHU Zu-chao SU Xiang-hui TANG Da-sheng JIN Xing Maciej GRUSZCZYNSKI The Province Key Lab of Fluid Transmission Technology Zhejiang Sci-Tech UniversityHangzhou 310018China State Key Laboratory of Deep Sea Mineral Resources Development and Utilization Changsha Institute of Mining and MetallurgyChangsha 410000China Wroclaw University of Environmental and Life Sciences Wroclaw 52-124Poland

To explore the mechanism of solid-liquid two-phase flow in deep-sea mining pumps,this paper investigates the influences of the impeller cross-section area on the multi-phase flow in the slurry *** and numerical results are presented for two-phase flow in four impellers with different cross-section *** show that the degree of vortex strength and the passing capacity of particles increase as the cross-section area of the *** addition,the correlations between the two-phase flow and cross-section area have been revealed by a mathematical model taking the force of the flow field into *** simulation results confirm the theoretical analysis,while the experimental pump performances validate the numerical *** influence of the cross-section area on two-phase flow and pump performance could provide theoretical support for the design of high-performance deep-sea mining slurry pumps.

关键词： deep-sea mining slurry pump CFD-DEM solid-liquid two-phase flow Rossby number

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Low-field NMR application in the characterization of CO_(2)geological storage and utilization related to shale gas reservoirs:a brief review

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Frontiers of Earth Science 2023年第3期17卷 739-751页

作者： Zhaohui LU Ke LI Xingbing LIU Peng ZHAO Jun LIU National and Local Joint Engineering Research Center of Shale Gas Exploration and Development Chongqing Institute of Geology and Mineral ResourceChongqing 401120China Key Laboratory of Shale Gas Exploration(Ministry of Natural Resources) Chongqing Institute of Geology and Mineral ResourcesChongqing 401120China MOE Key Laboratory of Deep Earth Science and Engineering Institute of New Energy and Low-Carbon TechnologySichuan UniversityChengdu 610065China State Key Laboratory of Coal Mine Disaster Dynamics and Control School of Resources and Safety EngineeringChongqing UniversityChongqing 400044China Chongqing Institute of Geological Survey Chongqing 401122China

CO_(2)geological storage and utilization(CGSU)is considered a far-reaching technique to meet the demand of increasing energy supply and decreasing CO_(2)*** CGSUs related to shale gas reservoirs,experimental investigations have attracted variable methodologies,among which low-field NMR(LF-NMR)is a promising method and is playing an increasingly key role in reservoir ***,the application of this nondestructive,sensitive,and quick LF-NMR technique in characterizing CGSU behavior in shale gas reservoirs is ***,the basic principle of LF-NMR for 1H-fluid detection is introduced,which is the theoretical foundation of the reviewed achievements in this ***,the reviewed works are related to the LF-NMR-based measurements of CH_(4)adsorption capacity and the CO_(2)-CH_(4)interaction in shale,as well as the performance on CO_(2)sequestration and simultaneous enhanced gas recovery from ***,the reviewed achievements have exhibited a large potential for LF-NMR application in CGSUs related to shale gas reservoirs,although some limitations and deficiencies still need to be ***,some suggestions are proposed for a more responsible development of the LF-NMR ***,this review is helpful in promoting the expanding application of the LF-NMR technique in CGSU implementation in shale gas reservoirs.

关键词： CO_(2)/CH_(4)competitive adsorption shale gas reservoir CO_(2)geological storage gas recovery enhancement low-field NMR

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Insight into the quality deterioration induced by microorganisms in Litopenaeus vannamei during superchilling storage

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Food Science and Human Wellness 2024年第6期13卷 3461-3471页

作者： Chuang Pan Kaiying Yang Xianqing Yang Haiyun Wu Chunsheng Li Shuxian Hao Yongqiang Zhao Shengjun Chen Xiaoshan Long Key Laboratory of Aquatic Product Processing Ministry of Agriculture and Rural AffairsNational Research and Development Center for Aquatic Product ProcessingSouth China Sea Fisheries Research InstituteChinese Academy of Fishery ScienceGuangzhou 510300China Co-Innovation Center of Jiangsu Marine Bio-industry Technology Jiangsu Ocean UniversityLianyungang 222005China College of Food Science and Technology Guangdong Ocean UniversityZhanjiang 524088China Collaborative Innovation Center of Seafood Deep Processing Dalian Polytechinc UniversityDalian 116034China Key Laboratory of Effi cient Utilization and Processing of Marine Fishery Resources of Hainan Province Sanya Tropical Fisheries Research InstituteSanya 572000China Graduate School of Marine Science and Technology Tokyo University of Marine Science and TechnologyTokyo 1088477Japan

Quality deterioration induced by microbial community in Litopenaeus vannamei during superchilling storage were demonstrated in this *** this study,6 microorganisms were identified as the biomarkers by 16S rDNA sequencing and 71 differential metabolites were identified by untargeted *** correlation analysis between microorganisms and differential metabolites revealed that Oceanicaulis,Aliihoeflea,Prauserella,Chelativorans and Pseudoalteromonas had the potential to be the important microorganisms of deterioration of superchilled ***,the spearman correlation analysis revealed that lightness value had highly significant correlation with Shewanella(P<0.01),and thiobarbituric acid content,total viable count value,total sulfhydryl content,trichloroacetic acid-soluble peptide and Ca2+-ATPase activity showed significantly correlation with Oceanicaulis,Prauserella,Chelativorans,Aliihoefl ea and Pseudoalteromonas(P<0.05).This study offers a better understanding for mechanisms behind quality degradation induced by microorganisms,which may help the quality maintaining of Pacific white shrimp during superchilling storage.

关键词： Superchilling Psychrophiles Untargeted metabolomics Litopenaeus vannamei Quality

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Tomography of the dynamic stress coefficient for stress wave prediction in sedimentary rock layer under the mining additional stress

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International Journal of Mining Science and technology 2021年第4期31卷 653-663页

作者： Wenlong Shen Guocang Shi Yungang Wang Jianbiao Bai Ruifeng Zhang Xiangyu Wang Henan Key Laboratory for Green and Efficient Mining&Comprehensive Utilization of Mineral Resources School of Energy Science and EngineeringHenan Polytechnic UniversityJiaozuo 454000China Key Laboratory of Deep Coal Resource Mining Ministry of Education State Key Laboratory of Coal Resources and Safe MiningChina University of Mining and TechnologyXuzhou 221116China Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization Jiaozuo 454000China

In this study,the tomography of dynamic stress coefficient(TDSC)was established based on a mechanical model of stress wave propagation in bedding planes and a mathematical model of the stress wave attenuation in rock *** reliability of the TDSC was verified by a linear bedding plane model and field ***,the TDSC in the dynamic stress propagation of bedding planes increases with the following conditions:(1)the increase of the normal stiffness of the bedding plane,(2)the increase of the incident angle of the stress wave,(3)the decrease of the incident frequency of the stress wave,or(4)the growth of three ratios(the ratios of rock densities,elastic moduli,and the Poisson’s ratios)of rocks on either side of bedding *** additional stress weakens TDSC linearly and slowly during the stress wave propagation in bedding planes,and the weakening effect increases with the growth of the three ***,the TDSC decreases exponentially in the rock mass as propagation distance *** a field case,the TDSC decreases significantly as vertical and horizontal distances increase and its wave range increases as vertical distance increases in the sedimentary rock layers.

关键词： Tomography of the dynamic stress coefficient Stress wave attenuation Mining additional stress Sedimentary rock layer

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Distinct and shared endothermic strategies in the heat producing tissues of tuna and other teleosts

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Science China(Life Sciences) 2023年第11期66卷 2629-2645页

作者： Baosheng Wu Xueli Gao Mingling Hu Jing Hu Tianming Lan Tingfeng Xue Wenjie Xu Chenglong Zhu Yuan Yuan Jiangmin Zheng Tao Qin Peidong Xin Ye Li Li Gong Chenguang Feng Shunping He Huan Liu Haimeng Li Qing Wang Zhenhua Ma Qiang Qiu Kun Wang School of Ecology and Environment Northwestern Polytechnical UniversityXi’an 710072China South China Sea Fisheries Research Institute Chinese Academy of Fishery SciencesGuangzhou 510300China State Key Laboratory of Agricultural Genomics BGI-ShenzhenShenzhen 518083China BGI Life Science Joint Research Center Northeast Forestry UniversityHarbin 150006China National Engineering Laboratory of Marine Germplasm Resources Exploration and Utilization Marine Science and Technology CollegeZhejiang Ocean UniversityZhoushan 316022China Institute of Deep-Sea Science and Engineering Chinese Academy of SciencesSanya 572000China The Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China College of Life Sciences University of Chinese Academy of SciencesBeijing 100049China

Although most fishes are ectothermic,some,including tuna and billfish,achieve endothermy through specialized heat producing tissues that are modified *** these heat producing tissues evolved,and whether they share convergent molecular mechanisms,remain ***,we generated a high-quality genome from the mackerel tuna(Euthynnus affinis)and investigated the heat producing tissues of this fish by single-nucleus and bulk RNA *** with other teleosts,tuna-specific genetic variation is strongly associated with muscle ***-nucleus RNA-seq revealed a high proportion of specific slow skeletal muscle cell subtypes in the heat producing tissues of *** genes of this cell subtype are associated with the relative sliding of actin and myosin,suggesting that tuna endothermy is mainly based on shivering *** contrast,cross-species transcriptome analysis indicated that endothermy in billfish relies mainly on nonshivering ***,the heat producing tissues of the different species do share some tissue-specific genes,including vascular-related and mitochondrial ***,although tunas and billfishes differ in their thermogenic strategies,they share similar expression patterns in some respects,highlighting the complexity of convergent evolution.

关键词： endothermy tuna convergent evolution divergent strategies heat producing tissues

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A Three-Step Underwater Moving Target Location Algorithm Based on FDOA 6

A Three-Step Underwater Moving Target Location Algorithm Bas...

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6th International Conference on Wireless Communications and Applications, ICWCAPP 2022

作者： Zhang, Shengrong Zhang, Kun Tian, Chuan Huang, Ju Shen, Chong Sansha Guohai Communication Technology Development Co.Ltd. Hainan Sansha570105 China Hainan University State Key Laboratory of Marine Resources Utilization in South China Sea Hainan Haikou570228 China Key Laboratory of Island Tourism Resource Data Mining and Monitoring Ministry of Culture and Tourism Hainan Tropical Ocean University Hainan Sanya572022 China Institute of Deep-sea Science and Engineering Chinese Academy of Sciences Hainan Sanya572000 China

ISBN: (纸本)9781665462907

The position and velocity estimation of underwater moving targets is an important part of the application of underwater sensor networks. The commonly used fusion of time difference of arrival (TDOA) and angle of arrival (AOA) can only roughly estimate the target position, but also has some limitations for nonlinear problems. So in order to overcome the nonlinear problem and improve the accuracy of underwater target *** on TDOA and AOA, this paper adopts a three-step location method which combines frequency difference of arrival (FDOA).At the same time, the whale algorithm is used to optimize the measurement error based on the weighted least square method (Tswls). Finally, the experimental results show that compared with TDOA location method and tdoa/aoa hybrid location algorithm, this method is superior to the above methods in the accuracy and bias of position and velocity estimation. © 2022 IEEE.

关键词： Time difference of arrival

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