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Interannual variability in the North Pacific meridional overturning circulation

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Chinese Journal of oceanology and Limnology 2013年第3期31卷 665-680页

作者：刘洪伟张启龙侯一筠段永亮 institute of oceanology Chinese Academy of Sciences Key Laboratory of ocean Circulation and Waves (KLOCAW) Chinese Academy of Sciences Graduate university of Chinese Academy of Sciences

We analyzed the temporal and spatial variation, and interannual variability of the North Pacific meridional overturning circulation using an empirical orthogonal function method, and calculated mass transport using Simple ocean Data Assimilation Data from 1958-2008. The meridional streamfunction field in the North Pacific tilts N-S; the Tropical Cell （TC）, Subtropical Cell （STC）, and Deep Tropical Cell （DTC） may be in phase on an annual time scale; the TC and the STC are out of phase on an interannual time scale, but the interannual variability of the DTC is complex. The TC and STC interannual variability is associated with ENSO （El Nifio-Southem Oscillation）. The TC northward, southward, upward, and downward transports all weaken in E1 Nifios and strengthen in La Nifias. The STC northward and southward transports are out of phase, while the STC northward and downward transports are in phase. Sea-surface water that reaches the middle latitude and is subducted may not completely return to the vopics. The zonal wind anomalies over the central North Pacific, which control Ekman transport, and the east-west slope of the sea level may be major factors causing the TC northward and southward transport interannual variability and the STC northward and southward transports on the interannual time scale. The DTC northward and southward transports decrease during strong E1 Nifios and increase during strong La Nifias. DTC upward and downward transports are not strongly correlated with the Nifio-3 index and may not be completely controlled by ENSO.

关键词： North Pacific ocean meridional overturning circulation interannual variation temporal andspatial variations

BOP shear force evaluation under complex scenarios

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Petroleum Science 2023年第4期20卷 2442-2451页

作者： Feng-Li Zhang Jin-Tao Ni Lai-Bin Zhang Yong-Sheng Chen Jin-Jiang Wang School of Mechanical and Transportation Engineering China University of PetroleumBeijing102249China School of Safety and ocean Engineering China University of PetroleumBeijing102249China Key Laboratory of Oil and Gas Production Safety and Emergency Technology Ministry of Emergency ManagementBeijing102249China

As the“throat”of the drilling well control system,ram blowout preventers(BOPs)can effectively prevent blowout ***,the ram shear mechanism under complex working conditions is unclear,and it is difficult to evaluate the ram BOP shear force,leading to frequent shear failure accidents in *** at the above problems,this paper takes the double-V ram BOP as the research object,and integrates the methods of theoretical analysis,simulation modeling,and test verification to analyze the shear force in the pipe shear process under both static and moving conditions.A ram BOP shear force evaluation method is proposed based on equivalent ***,by comparing with calculation data and experimental data,the error between them is less than 5%,demonstrating the applicability and effectiveness of the proposed *** research results can provide a theoretical basis for oilfield operations of ram BOPs.

关键词： Double-V ram Blowout preventer Shear force assessment Moving state shearing Finite element analysis Shear test under pressure

A TMA-Seq2seq Network for Multi-Factor Time Series Sea Surface Temperature Prediction

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Computers, Materials & Continua 2022年第10期73卷 51-67页

作者： Qi He Wenlong Li Zengzhou Hao Guohua Liu Dongmei Huang Wei Song Huifang Xu Fayez Alqahtani Jeong-Uk Kim Department of Information Technology Shanghai Ocean UniversityShanghai201306China State Key Laboratory of Satellite ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou310012China College of Computer Dong Hua UniversityShanghai200051China College of Information Technology Shanghai Jian Qiao UniversityShanghai201306China Software Engineering Department College of Computer and Information SciencesKing Saud UniversityRiyadh 12372Saudi Arabia Department of Electrical Engineering Sangmyung UniversitySouth KoreaKorea

Sea surface temperature (SST) is closely related to global climatechange, ocean ecosystem, and ocean disaster. Accurate prediction of SST isan urgent and challenging task. With a vast amount of ocean monitoring dataare continually collected, data-driven methods for SST time-series predictionshow promising results. However, they are limited by neglecting complexinteractions between SST and other ocean environmental factors, such as airtemperature and wind speed. This paper uses multi-factor time series SSTdata to propose a sequence-to-sequence network with two-module attention(TMA-Seq2seq) for long-term time series SST prediction. Specifically, TMASeq2seq is an LSTM-based encoder-decoder architecture facilitated by factorand temporal-attention modules and the input of multi-factor time series. Ittakes six-factor time series as the input, namely air temperature, air pressure,wind speed, wind direction, SST, and SST anomaly (SSTA). A factor attentionmodule is first designed to adaptively learn the effect of different factors onSST, followed by an encoder to extract factor-attention weighted features asfeature representations. And then, a temporal attention module is designedto adaptively select the hidden states of the encoder across all time steps tolearn more robust temporal relationships. The decoder follows the temporalattention module to decode the feature vector concatenated from the weightedfeatures and original input feature. Finally, we use a fully-connect layer tomap the feature into prediction results. With the two attention modules, ourmodel effectively improves the prediction accuracy of SST since it can notonly extract relevant factor features but also boost the long-term *** experiments on the datasets of china Coastal Sites (CCS) demonstrate that our proposed model outperforms other methods, reaching 98.29%in prediction accuracy (PACC) and 0.34 in root mean square error (RMSE).Moreover, SST prediction experiments in china’s East, South,

关键词： Sea surface temperature multi-factor attention long short-term memory

Fluorescence recovery after photobleaching:analyses of cyanobacterial phycobilisomes reveal intrinsic fluorescence recovery

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Marine Life Science & Technology 2021年第4期3卷 427-433页

作者： Nan Zhang Kang Li Bin-Bin Xie Xiu-Lan Chen Bai-Cheng Zhou Hai-Nan Su Yu-Zhong Zhang State Key Laboratory of Microbial Technology and Marine Biotechnology Research CenterShandong UniversityQingdao 266237China College of Marine Life Sciences Frontiers Science Center for Deep Ocean Multispheres and Earth SystemOcean University of ChinaQingdao 266003China Laboratory for Marine Biology and Biotechnology Pilot National Laboratory for Marine Science and TechnologyQingdao 266237China College of Bioengineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China

Fluorescence recovery after photobleaching(FRAP)has been used to study the dynamics of the cyanobacterial photosynthesis apparatus since *** recovery of cyanobacteria during FRAP was conventionally interpreted as a result of phycobilisome(PBS)diffusion on the surface of the thylakoid *** mechanism of state transition in cyanobacteria has been widely attributed to PBS ***,in red algae,another PBS-containing group,the intrinsic photoprocess was found to contribute greatly to the fluorescence recovery of PBS,which raises questions concerning the role of FRAP in red algal ***,it is important to re-evaluate the nature of PBS fluorescence recovery in *** the present study,four cyanobacterial strains with different phenotypes and PBS compositions were used to investigate their FRAP *** recovery of PBS was observed in wholly photobleached cells in all four cyanobacterial strains,in which the contribution of PBS diffusion to the fluorescence recovery was not ***,the fluorescence recovered in isolated PBSs and PBS-thylakoid membranes after photobleaching further demonstrated the intrinsic photoprocess nature of fluorescence *** findings suggest that the intrinsic photoprocess contributed to the fluorescence recovery following photobleaching when measured by the FRAP method.

关键词： Cyanobacteria Fluorescence recovery after photobleaching Intrinsic photoprocess Mobility Phycobilisome

Use of Otolith Shape for the Identification of Trumpeter Sillago (Sillago maculata) and Silver Sillago(Sillago sihama)

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Journal of ocean university of china 2010年第3期9卷 286-290页

作者： WANG Yingjun YE Zhenjiang LIU Qun College of Fisheries Ocean University of China Qingdao 266003 P. R. China

Otolith shape is species-specific in *** this study,161 samples of Trumpeter sillago Sillago maculata and 164 of Silver sillago Sillago sihama were collected from Beibu Gulf in July *** main objective of this study was to use morphological variables and Fourier harmonics to describe otolith characteristics and use discriminant analyses to separate the two *** were measured by traditional one and two dimensional measures(otolith length,width,diameters,area,perimeter,rectangularity and circularity),as well as by Fourier analysis to capture the finer regions of the *** of covariance(ANCOVA) showed that there was significant correlation between morphological variables(diameter,perimeter,otolith length,otolith width,otolith area,density,harmonics 3,harmonics 4,harmonics 5,harmonics 13,harmonics 15,and harmonics 16) and body *** minimize size effects on the morphological variables between species,only fish with a body length between 90 and 140 mm were included in the data analysis and the variables which had significant relation with body length were transformed using the *** result showed that the accuracy of discriminant analysis was 97.8% and 100% for Trumpeter sillago and Silver sillago,*** high accuracy indicated that otolith shape was described accurately by morphological variables and Fourier harmonics,and discriminant analysis was an effective way to identify and separate the two species.

关键词： Sillago maculate Sillago sihama Otolith shape analysis Fourier analysis identification

Effect of Replacing Fish Meal with Extruded Soybean Meal on Growth, Feed Utilization and Apparent Nutrient Digestibility of Juvenile White Shrimp(Litopenaeus vannamei)

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Journal of ocean university of china 2015年第5期14卷 865-872页

作者： YANG Qihui TAN Beiping DONG Xiaohui CHI Shuyan LIU Hongyu Laboratory of Aquatic Animal Nutrition and Feed College of Fisheries Guangdong Ocean University

Extruded soybean meal （ESBM） was evaluated as a protein source for partial replacement of fish meal （FM） in diets of juvenile Litopenaeus vannarnei. In the control diet （Diet 1）, FM protein was replaced with increasing dietary levels of ESBM （4.28%, 8.40%, 12.62%, 16.82%, and 25.26%） at 10%, 20%, 30%, 40%, and 60% levels （Diets 2 to 6, respectively）. An eight-week feeding trial was conducted on 720 juvenile shrimp （0.67 g ± 0.01 g mean initial Weight）, and nutrient digestibility of the six diets was determined. ESBM could replace 20% of FM without causing a significant reduction in growth of shrimp, but other dietary treatments strongly affected whole body composition. Crude protein content of the whole body fed Diet 6 was significantly lower than that fed Diet 2 （P〈0.05）, while crude lipid content of the whole body fed Diet 5 or 6 was significantly higher than that fed Diet 2 （P〈0,05）. Protein digestibilities of Diets 5 and 6 were significantly lower than that of Diet 1 （P〈0.05）. Digestibility of lipids ranged from 96.97% in Diet 6 to 98.34% in Diet 3, whereas dry matter digestibility decreased with increasing replacement level. This study indicates that 20% FM replacement with ESBM in the basic diet containing 40% protein and 30% FM is optimal for juvenile L. vannamei.

关键词： Litopenaeus vannamei fish meal extruded soybean meal growth performance feed ttilization nutrient digestibility

Settlement and metamorphosis of R apana venosa(Gastropoda: Muricidae) with implications for artificial culture

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Journal of oceanology and Limnology 2020年第1期38卷 249-259页

作者： YU Zhenglin YANG Meijie SONG Hao HU Zhi ZHOU Cong WANG Xiaolong LI Haizhou ZHANG Tao Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China university of Chinese Academy of Sciences Beijing 100049China Center for ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Shandong Fu Han ocean Sci-Tech Co.Ltd. Haiyang 265114China

The rapa whelk Rapana venosa transforms from a phytophagous larva to a camivorous juvenile after settlement and *** high mortality rate and low metamorphosis rate(<1%)of larvae are among the key factors limiting the recovery of the resources *** studied these two processes and showed that the larva has the ability to settle and metamorphose in the middle and late 4 spiral whorl period,and the use of substrates(scallop shells with oysters)can significantly improve the settlement and metamorphosis rate of *** presence of darkness,juvenile bivalve shellfish,and oyster polysaccharide could effectively increase the rates of larval settlement and *** findings broaden the understanding of settlement and metamorphosis in gastropods and can be used to improve population control,resource recovery and commercial breeding strategies for ***.

关键词： larval development substrate oyster polysaccharide commercial breeding

Effect of Cu loading content on the catalytic performance of Cu-USY catalysts for selective catalytic reduction of NO with NH_(3)

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Journal of Environmental Sciences 2023年第4期126卷 445-458页

作者： Jie Wan Haipeng Yang Yijun Shi Yanjun Liu Jin Zhang Jun Zhang Gongde Wu Renxian Zhou Energy research institute Nanjing Institute of TechnologyNanjing 211167China institute of Catalysis Zhejiang UniversityHangzhou 310028China

Series of Cu-USY zeolite catalyst with different Cu loading content were synthesized through simple impregnation *** obtained catalysts were subjected to selective catalytic reduction of NOxwith NH_(3)(NH_(3)-SCR) performance evaluation,structural/chemical characterizations such as X-ray diffraction (XRD),N2adsorption/desorption,H_(2)temperature-programmed reduction (H_(2)-TPR),NH_(3)temperature-programmed desorption (NH_(3)-TPD) as well as detailed in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) experiments including CO adsorption,NH_(3)adsorption and NO+O_(2)in situ *** show that Cu-USY with proper Cu loading (in this work 5Cu-USY with5 wt.%Cu) could be promising candidates with highly efficient NH_(3)-SCR catalytic performance,relatively low byproduct formation and excellent hydrothermal stability,although its SO_(2)poisoning tolerability needs *** characterizations reveal that such catalytic advantages can be attributed to both active cu species and surface acid centers evolution modulated by Cu *** one hand,Cu species in the super cages of zeolites increases with higher Cu content and being more conducive for NH_(3)-SCR *** the other hand,higher Cu loading leads to depletion of Br?nsted acid centers and simultaneous formation of abundant Lewis acid centers,which facilitates NH_(4)NO_(3)reduction via NH_(3)adsorbed on Lewis acid centers,thus improving SCR ***,Cu over-introduction leads to formation of surface highly dispersed CuOx,causing unfavorable NH_(3)oxidation and inferior N2selectivity.

关键词： NH_(3)-SCR USY zeolite Cu species Brønsted/Lewis acid centers Diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)

Phylogenetic analyses of the genes involved in carotenoid biosynthesis in algae

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Acta oceanologica Sinica 2018年第4期37卷 89-101页

作者： WANG Shanshan ZHANG Lei CHI Shan WANG Guoliang WANG Xumin LIU Tao TANG Xuexi College of Marine Life Sciences Ocean University of China CAS Key Laboratory of Genome Sciences and Information/Beijing Key Laboratory of Genome and Precision Medicine Technologies Beijing Institute of GenomicsChinese Academy of Sciences

Carotenoids play a crucial role in absorbing light energy for photosynthesis,as well as in protecting chlorophyll from *** contrast to the Streptophyta,few studies have examined carotenoid biosynthetic pathways in algae,owing to a shortage of *** part of the 1000 Plants Project,we sequenced and assembled the transcriptomes of 41 marine macroalgal species,including 22 rhodophytes and 19 phaeophytes,and then combined the datasets with publicly available data from Gen Bank（National Center for Biotechnology Information） and the *** of Energy Joint Genome *** a result,we identified 68 and 79 fulllength homologs in the Rhodophyta and Phaeophyceae,respectively,of seven inferred carotenoid biosynthetic genes,including the genes for phytoene synthase（PSY）,phytoene desaturase（PDS）,ζ-carotene desaturase（ZDS）,ζ-carotene isomerase（Z-ISO）,prolycopene isomerase（crt ISO）,lycopene β-cyclase（LCYB）,and lycopene ε-cyclase（LCYE）.We found that the evolutionary history of the algal carotenoid biosynthetic pathway was more complex than that of the same pathway in the Streptophyta and,more specifically,that the evolutionary history involved endosymbiotic gene transfer,gene duplication,and gene *** all of the eukaryotic algae that we examined had inherited the seven carotenoid biosynthesis genes via endosymbiotic gene ***,PSY,crt ISO,and the ancestral lycopene cyclase gene（LCY） underwent duplication events that resulted in multiple gene copies,and the duplication and subsequent divergence of LCYB and LCYE specialized and complicated the cyclization of *** findings also verify that the loss of LCYE in both the microphytic rhodophytes and phaeophytes explains the differences in their carotenoid patterns,when compared to the macrophytic *** analyses provide a molecular basis for further biochemical and physiological validation in additional algal species and should help elucidate the origin and evolution of caro

关键词： carotenoid biosynthesis algae phylogenetic analysis