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An improved GNSS ambiguity best integer equivariant estimation method with Laplacian distribution for urban low-cost RTK positioning

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Satellite Navigation 2024年第1期5卷 109-124页

作者： Ying Liu Wanke Liu Xiaohong Zhang yantao liang Xianlu Tao Liye Ma School of Geodesy and Geomatics Hubei Luojia LaboratoryWuhan University129 Luoyu RoadWuhan430079HubeiChina Chinese Antarctic Center of Surveying and Mapping Wuhan University129 Luoyu RoadWuhan430079HubeiChina School of Instrument Science and Engineering Southeast UniversityNanjingJiangsuChina The 54 Research Institute of China Electronics Technology Group CorporationShijiazhuang050081HebeiChina State Key Laboratory of Satellite Navigation System and Equipment Technology Shijiazhuang050081HebeiChina

The integer least squares(ILS)estimation is commonly used for carrier phase ambiguity resolution(AR).More recently,the best integer equivariant(BIE)estimation has also attracted an attention for complex application scenarios,which exhibits higher reliability by a weighted fusion of integer ***,traditional BIE estimation with Gaussian distribution(GBIE)faces challenges in fully utilizing the advantages of BIE for urban low-cost positioning,mainly due to the presence of outliers and unmodeled *** this end,an improved BIE estimation method with Laplacian distribution(LBIE)is proposed,and several key issues are discussed,including the weight function of LBIE,determination of the candidates included based on the OIA test,and derivation of the variance of LBIE solutions for reliability *** results show that the proposed LBIE method has the positioning accuracy similar to the BIE using multivariate t-distribution(TBIE),and significantly outperforms the ILS-PAR and GBIE *** an urban expressway test with a Huawei Mate40 smartphone,the LBIE method has positioning errors of less than 0.5 m in three directions and obtains over 50%improvements compared to the ILS-PAR and GBIE *** an urban canyon test with a low-cost receiver STA8100 produced by STMicroelectronics,the positioning accuracy of LBIE in three directions is 0.112 m,0.107 m,and 0.252 m,respectively,with improvements of 17.6%,27.2%,and 26.1%compared to GBIE,and 23.3%,28.2%,and 30.6%compared to ***,its computational time increases by 30–40%compared to ILS-PAR and is approximately half of that using TBIE.

关键词： Ambiguity resolution Best integer equivariant estimation Laplacian distribution Urban environments Low-cost GNSS receivers Real-time kinematic

The effect of iron on the preservation of organic carbon in marine sediments and its implications for carbon sequestration

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Science China Earth Sciences 2023年第9期66卷 1946-1959页

作者： Limin HU Yuhan JI Bin ZHAO Xiting LIU Jiazong DU yantao liang Peng YAO College of Marine Geosciences Key Laboratory of Submarine Geosciences and Prospecting TechniquesMinistry of EducationOcean University of ChinaQingdao 266100China Laboratory for Marine Geology Laoshan LaboratoryQingdao 266237China Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationOcean University of ChinaQingdao 266100China College of Marine Life Sciences Ocean University of ChinaQingdao 266100China

Marine sediments are the most significant reservoir of organic carbon(OC)in Earth′s surface ***,a crucial component of the marine biogeochemical cycle,has a considerable impact on marine ecology and carbon *** the effect of iron on the preservation of OC in marine sediments is essential for comprehending biogeochemical processes of carbon and climate *** review summarizes the methods for characterizing the content and structure of iron-bound OC and explores the influencing mechanism of iron on OC preservation in marine sediments from two aspects:the selective preservation of OC by reactive iron minerals(iron oxides and iron sulfides)and iron redox *** selective preservation of sedimentary OC is influenced by different types of reactive iron minerals,OC reactivity,and functional *** iron redox process has dual effects on the preservation and degradation of *** considering sedimentary records of iron-bound OC across diverse marine environments,the role of iron in long-term preservation of OC and its significance for carbon sequestration are *** research should focus on identifying effective methods for extracting reactive iron,the effect of diverse functional groups and marine sedimentary environments on the selective preservation of OC,and the mediation of *** work will help elucidate the influencing mechanisms of iron on the long-term burial and preservation of OC and explore its potential application in marine carbon sequestration to maximize its role in achieving carbon neutrality.

关键词： Marine sedimentary organic carbon Reactive iron minerals Iron-bound organic carbon Selective preservation Carbon sequestration

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Distribution of Microbial Populations and Their Relationship with Environmental Variables in the North Yellow Sea,China

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Journal of Ocean University of China 2012年第1期11卷 75-85页

作者： BAI Xiaoge WANG Min liang yantao ZHANG Zhifeng WANG Fang JIANG Xuejiao College of Marine Life Sciences Key Laboratory of Marine Genetics and BreedingMinistry of EducationOcean University of ChinaQingdao 266003P.R.China

In order to understand the large-scale spatial distribution characteristics of picoplankton,nanophytoplankton and virio-plankton and their relationship with environmental variables in coastal and offshore waters,flow cytometry(FCM) was used to ana-lyze microbial abundance of samples collected in summer from four depths at 36 stations in the North Yellow Sea(NYS).The data revealed spatial heterogeneity in microbial populations in the offshore and near-shore waters of the NYS during the *** the surface layer,picoeukaryotes were abundant in the near-shore waters,Synechococcus was abundant in the offshore areas,and bacte-rial and viral abundances were high in the near-shore waters around the Liaodong *** the near-shore waters,no significant vertical variation of picophytoplankton(0.2-2μm) abundance was ***,the nanophytoplankton abundance was higher in the upper layers(from the surface to 10 m depth) than in the bottom *** the offshore waters,both pico-and nanophytoplankton(2-20μm) abundance decreased sharply with depth in the North Yellow Sea Cold Water Mass(NYSCWM).But,for the vertical dis-tribution of virus and bacteria abundance,no significant variation was observed in both near-shore and offshore *** microbes were more sensitive to environmental change than heterotrophic microbes and *** showed a positive correla-tion with bacterial abundance,suggesting that the bacteriophage might be prominent for virioplankton(about 0.45μm) in summer in the NYS and that viral abundance might play an important role in microbial loop functions.

关键词： picoplankton nanophytoplankton bacterioplankton virioplankton the North Yellow Sea(NYS)

Carbon sequestration processes and mechanisms in coastal mariculture environments in China

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Science China Earth Sciences 2017年第12期60卷 2097-2107页

作者： ZHANG YongYu ZHANG JiHong liang yantao LI HongMei LI Gang CHEN Xiao ZHAO Peng JIANG ZengJie ZOU DingHui LIU XiaoYong LIU JiHua Key Laboratory of Biofuels Shandong Provincial Key Laboratory of Energy GeneticsQingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China Joint Laboratory of Microbial Oceanograph Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Yellow Sea Fisheries Research Institute Chinese Academy of Fishery SciencesQingdao 266071China Institute of Marine Science and Technology Shandong UniversityQingdao 266273China National Marine Data and Information Service Tianjin 300171China School of Environment and Energy South China University of TechnologyGuangzhou 510006China Shandong Haizhibao Marine Sci.&Tech.Ltd.Co. Weihai 264300China

China is the global leader in mariculture production. Increasing sequestered marine carbon(also known as blue carbon) via mariculture activities is a promising approach for mitigating climate change and promoting the development of a low-carbon economy. Mariculture blue carbon is also considered an important component of China's "sea granary". In addition to shellfish and macroalgae yields, which represent carbon removed from mariculture environment, blue carbon also includes other important components, which have been largely neglected in the past, such as the carbon transformed by microbes,dissolved organic carbon(mainly referred to as recalcitrant dissolved organic carbon), and sedimentary particulate carbon. Hence,from different aspects, a comprehensive study on the formation processes and mechanisms of carbon sequestration is of great significance for comprehensively unveiling the carbon sequestration capability in coastal mariculture environment, which will contribute to the sustainable development of the fishery economy and construction of an ecological civilization. Moreover, it may add significant economic benefits to the future carbon-trading market.

关键词： Macroalgae and shellfish mariculture Marine carbon sequestration Microbe Recalcitrant dissolved organic carbon Carbon sedimentation

Modelling marine DOC degradation time scales

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National Science Review 2018年第4期5卷 468-474页

作者： Luca Polimene Richard B.Rivkin Ya-Wei Luo Eun Young Kwon Marion Gehlen M.Angelica Pe?a Nannan Wang yantao liang Hermanni Kaartokallio Nianzhi Jiao Plymouth Marine Laboratory Department of Ocean Sciences Memorial University of Newfoundland State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen University Center for Climate Physics Institute for Basic ScienceSouth Korea Laboratoire des Sciences du Climat et de l'Environnement Institut Pierre Simon LaplaceCEA-CNRS-UVSQ Institute of Ocean Sciences Fisheries and Oceans Canada Key Laboratory of Biofuels Shandong Provincial Key Laboratory of Energy Genetics Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of Sciences Finnish Environment Institute Marine Research Centre

INTRODUCTION Marine dissolved organic carbon(DOC)is formed of a large number of highly diverse *** on the environmental conditions,a fraction of these molecules may become progressively resistant to bacterial degradation and accumulate in the ocean for extended time *** longlived DOC(the so-called recalcitrant DOC,RDOC)is thought to play an

关键词： DOC Modelling marine DOC degradation time scales

Correction: Genomic diversity and ecological distribution of marine Pseudoalteromonas phages

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Marine Life Science & Technology 2023年第2期5卷 286-288页

作者： Kaiyang Zheng Yue Dong yantao liang Yundan Liu Xinran Zhang Wenjing Zhang Ziyue Wang Hongbing Shao Yeong Yik Sung Wen Jye Mok Li Lian Wong Andrew McMinn Min Wang College of Marine Life Sciences Institute of Evolution and Marine Biodiversityand Frontiers Science Center for Deep Ocean Multispheres and Earth SystemOcean University of ChinaQingdao 266100China UMT-OUC Joint Center for Marine Studies Qingdao 266003China Institute of Marine Biotechnology Universiti Malaysia Terengganu(UMT)21030 Kuala NerusMalaysia Institute for Marine and Antarctic Studies University of TasmaniaHobartAustralia Haide College Ocean University of ChinaQingdao 266100China The Afliated Hospital of Qingdao University Qingdao 266000China

In this article the graphics relating to Figs.2 and 3 captions had been interchanged;the fgure(s)should have appeared as shown *** original article has been *** Access This article is licensed under a Creative Commons... 详细信息

关键词： Open Creative Access License

Temperate Stutzerimonas Phage Encoding Toxin-Antitoxin System Genes Represents a Novel Genus

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Journal of Ocean University of China 2024年第4期23卷 1087-1101页

作者： ZHANG Hong GUO Ruizhe GAO Chen ZHENG Kaiyang XIONG Yao DONG Yue LIU Yundan WANG Ziyue CHEN Ying WANG Hongmin SHAO Hongbing SUNG Yeong Yik MOK Wen Jye WONG Li Lian MCMINN Andrew WANG Min liang yantao College of Marine Life Sciences Institute of Evolution and Marine BiodiversityMOE Laboratory of Evolution and Marine BiodiversityFrontiers Science Center for Deep Ocean Multispheres and Earth SystemCenter for Ocean Carbon NeutralityOcean University of ChinaQingdao 266003China UMT-OUC Joint Center for Marine Studies Qingdao 266003China Institute of Marine Biotechnology Universiti Malaysia Terengganu21030 Kuala TerengganuMalaysia Institute for Marine and Antarctic Studies University of TasmaniaHobartTAS 7001Australia Haide College Ocean University of ChinaQingdao 266100China The Affiliated Hospital of Qingdao University Qingdao 266001China

Stutzerimonas have been extensively studied due to their remarkable metabolic and physiological ***,research on its phages is currently *** this study,we isolated a novel double-stranded DNA(dsDNA)phage,vB_SstM-PG1,from the marine environment that infects Stutzerimonas stutzeri *** dsDNA genome is 37204 bp long with a G/C content of 64.14%and encodes 54 open reading *** phage possesses a tail packaging structure that is different from known Stutzerimonas stutzeri phages and exhibits structural protein characteristics similar to those of temperate *** addition,two genes of toxin-antitoxin system,including YdaS_antitoxin and HEPN_SAV_6107,were found in the vB_SstM-PG1 genome and play important roles in regulating host growth and *** phylogenetic tree and comparative genomic analysis,it has been determined that vB_SstM-PG1 is not closely related to any phages previously identified in the GenBank ***,it has a connection with enigmatic,uncultured ***,the vB_SstM-PG1 virus exhibits an average nucleotide identity of over 70%with six uncultivated viruses identified in the IMG/VR v4 *** significant finding has resulted in the identification of a novel viral genus known as Metabovirus.

关键词： Stutzerimonas vB_SstM-PG1 Metabovirus temperate phage genomic and phylogenetic analysis

Relationship Between Organ Masses and Basal Metabolic Rate (BMR) in Tree Sparrows (Passer montanus)

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Journal of Northeast Agricultural University(English Edition) 2011年第4期18卷 39-49页

作者： LI Ming YIN Yajie NIE Chunyu QU Lina ZHNAG Guofa liang yantao ZHAO Xiaoju LIU Jinsong School of Life Science Daqing Normal College Daqing 163712 Heilong jiang China College of Life and Environmental Sciences Wenzhou University Wenzhou 325027 Zhejiang China

BMR （basal metabolic rate）, body mass and organ masses of tree sparrows （Passer montanus） were measured to analyze the correlation between organ masses and BMR in tree sparrows, and to evaluate the underlying physiological causes of difference in BMR. Adult tree sparrows were live-trapped by mist net in Qiqihar City, Heilongjiang Province （47°29′N, 124°02′E）. The closed circuit respirometer was used to measure the metabolic rate （MR）, and controlled the ambient temperature by using a water bath （±0.5℃）. Body masses were measured to the nearest 0.01 g before and after BMR measurements with a Sartorius balance （model BT25S）. The mean value was recorded as body mass. Wet and dry masses of several organs were measured, too. BMR was （4.276± 0.385） mL O2/（g·h） and mean body mass was （18.522±0.110） g. Since not all the variables were normal distributed, a log10- transformation of those variables was employed to linearize them, prior to analyses. Simple regression analyses indicated that most organ masses showed a significant high correlation with body mass. Both the small intestine and rectum masses were notable exception to that trend. The body-mass-adjusted residual analysis showed that only the kidney wet mass, brain mass, stomach mass, small mass and rectum wet mass correlated with BMR. In addition, correlations between several organ masses and BMR were observed. Because of the inter-correlations of organ masses, a principal component analysis （PCA） was performed to redefine the morphological variability. The first four components whose eigenvalues were greater than 1 could explain 75.2% variance of BMR. The first component, whose proportion reached 30.19%, was affected mainly by stomach mass, small intestine mass and rectum mass. Therefore, the results supported the hypothesis that BMR was controlled by some ＂expensive metabolic＂ organs

关键词： tree sparrow BMR organ mass

热液、冷泉、深渊和极地海洋极端环境中噬菌体宏基因组研究进展

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病毒学报 2023年第6期39卷 1814-1824页

作者：刘港梁彦韬汪岷中国海洋大学海洋生物多样性与进化研究所水产学院海洋生命学院极地海洋过程与全球海洋变化重点实验室深海圈层与地球系统前沿科学中心青岛266003

海洋极端环境中存在着丰富的微生物类群,这些独特的生态系统为研究微生物群落的结构、功能和进化提供了良好的机会。噬菌体作为地球上最丰富的生物实体,在海洋微生物群落调控、基因转移、代谢重编程、物质循环和能量代谢中起着重要作用... 详细信息

海洋极端环境中存在着丰富的微生物类群,这些独特的生态系统为研究微生物群落的结构、功能和进化提供了良好的机会。噬菌体作为地球上最丰富的生物实体,在海洋微生物群落调控、基因转移、代谢重编程、物质循环和能量代谢中起着重要作用。本文综述了近年来在热液、冷泉、深渊和极地四种海洋极端环境中噬菌体宏基因组的研究进展,探究了噬菌体在四种不同生境中的群落组成、生活方式、与宿主的相互作用和功能基因等,发现在不同的海洋极端环境中噬菌体存在着区别和相似性,以期为未来海洋极端环境中噬菌体的研究提供新的思路。

关键词：噬菌体海洋极端环境宏基因组学