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A rigorous real-time acoustic positioning method for ocean bottom seismic exploration

Satellite Navigation 2024年第1期5卷 168-190页

作者： Jinye Ma Shouchuan Fang Jianhu Zhao School of Geodesy and Geomatics Wuhan University129 Luoyu RoadWuhan430079China Institute of Marine Science and Technology Wuhan UniversityWuhan430079China Surveying Service Center BGP Inc.CNPCZhuozhou072751HebeiChina

The conventional technique for positioning seafloor geophones in ocean bottom seismic exploration encounters several challenges,inc.uding the significant impact of outliers on positioning results,underutilization of high-precision observations,and low efficiency in real-time data *** issues inevitably affect the quality of seismic exploration *** address these challenges and enhance the accuracy of geophone positioning,this paper proposes a rigorous real-time acoustic positioning method for geophones based on sequential adjustment and Baarda's outlier detection *** proposed method comprises three key steps:grouping the original acoustic observations,constructing the intra-group acoustic positioning model,and synthesizing the positioning results across the different *** validity and practicality of this approach are confirmed through a simulation experiment as well as the field experiment conducted in the Bohai Sea,*** results demonstrate that the proposed method effectively eliminates outliers in the original observations and maximizes the utilization of high-quality *** to traditional acoustic positioning methods,it significantly reduces positioning errors from meters to decimeters,and in some cases can achieve centimeter-level *** the sound velocity profile in the operating sea area is measured,the method can attain the posterior standard deviation at the millimeter level and positioning errors within 10 *** the sound velocity profile is unknown,the method can achieve the posterior standard deviation at centimeter-level and positioning errors of approximately 20 cm.

关键词： Ocean bottom seismic exploration Geophone positioning Acoustic positioning method Sequential adjustment Outlier detection

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回忆与导师王仁先生的一次谈话

回忆与导师王仁先生的一次谈话

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作者：梁北援 Veritas DGC inc. exploration Services Division RC Squared Technologies USA

今年七月,我回国探亲时,听老同学讲王仁先生已经去世了。回想起多年来从先生那里获得的教益,近两年却未能见先生一面,深感遗憾。现特此回忆导师王仁先生与我的一次谈话,以表敬意。记得在我临近硕士学位答辩时(1983年春),我将对他人在同...

今年七月,我回国探亲时,听老同学讲王仁先生已经去世了。回想起多年来从先生那里获得的教益,近两年却未能见先生一面,深感遗憾。现特此回忆导师王仁先生与我的一次谈话,以表敬意。记得在我临近硕士学位答辩时(1983年春),我将对他人在同一领域工作的思路及模型的看法与先生谈了。那时年轻,未免其中夹带了一些门户之见。先生耐心地听完

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Conceptual Design of the Aluminum Reflector Antenna for DATE5

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Research in Astronomy and Astrophysics 2016年第8期16卷 43-50页

作者： Yuan Qian Frank W. Kan Andrew T. Sarawit Zheng Lou Jing-Quan Cheng Hai-Ren Wang Ying-Xi Zuo Ji Yang Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China Key Laboratory for Radio Astronomy Chinese Academy of Sciences Nanjing 210008 China Simpson Gumpertz and Heger inc. Waltham MA 02453 USA

DATE5, a 5 m telescope for terahertz exploration, was proposed for acquiring observations at Dome A, Antarctica. In order to observe the terahertz spectrum, it is necessary to maintain high surface accuracy in the the antenna when it is exposed to Antarctic weather conditions. Structural analysis shows that both machined aluminum and carbon fiber reinforced plastic （CFRP） panels can meet surface accuracy requirements. In this paper, one design concept based on aluminum panels is introduced. This inc.udes panel layout, details on panel support, design of a CFRP backup structure, and detailed finite element analysis. Modal, gravity and thermal analysis are all performed and surface deformations of the main reflector are evaluated for all load cases. At the end of the paper, the manufacture of a prototype panel is also described. Based on these results, we found that using smaller aluminum reflector panels has the potential to meet the surface requirements in the harsh Dome A environment.

关键词： methods analytical -- methods numerical -- telescopes -- techniques radar astronomy

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Transcriptomics of Chinese Sapium Sebiferum(L.)Roxb seed to reveal key enzymes involved in oil accumulation

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Oil Crop Science 2020年第3期5卷 107-113页

作者： Yanyan Yu Yun Liu College of Life Science and Technology Beijing University of Chemical TechnologyBeijingChina Beijing Zest Bridge Media Technology inc. BeijingChina

Chinese Sapium sebiferum(L.)Roxb has great potential to emerge as a promising biodiesel resource plant due to abundant oil content in ***,the unavailability of transcriptomic and genomic data impedes the progress of application in biodiesel *** analysis will help to further exploit tallow and kernel oil utilization in industry and facilitate molecular-breeding-based genetic improvement of *** hiseq 2000 sequencing platform was used to perform de novo transcriptome assembly and gene expression analyses of seeds from three strains in three developmental stages.A total of 188,254 unigenes over 200 bp were assembled with average length of 699 *** transcriptic unigenes were functionally assigned by GO and KEGG *** was used to identify differentially expressed unigenes of five cDNA *** genes endcoding enzymes related to fatty acid metabolism were ***-PCR was employed to confirm five key enzymes involved in fatty acid and triacylglycerol *** study provided comprehensive gene expression information of Chinese *** seed at transcriptional *** transcriptome data will facilitate high-oil-content genetic cultivation of ***,which will further exploit tallow and kernel oil utilization in biodiesel industry.

关键词： Sapium sebiferum(L.)Roxb Transcriptome Differentially expressed analysis Lipid metabolism

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The complete DNA sequence of the mitochondrial genome of Sinonovacula constricta (Bivalvia:Solecurtidae)

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Acta Oceanologica Sinica 2010年第2期29卷 88-92页

作者： ZHENG Runling LI Jiale NIU Donghong Key Laboratory of exploration and Utilization of Aquatic Genetic Resources Shanghai Ocean University Ministry of Education Shanghai 201306 China Aquaculture Division E-Institute of Shanghai Universities Shanghai 201306 China

The nucleotide sequence of the mitochondrial genome of the solecurtidae Bivalvia mollusca Sinonovacula constricata（GenBank accession number EU880278） has been determined and is reported here. We determined the complete mitochondrial genome sequence using long-PCR and Shot Gun Sequencing. Contained within the 17 225 base pairs （bp） are the two ribosomal RNA genes and 12 protein coding genes typical of metazoan mitochondrial genomes. The S. constricta mitochondrial DNA （mtDNA） did not contain a gene for atp8, similar to the mtDNA of Crassostrea virginica, Crassostrea giga and Mytilus edulis. The S. constricta mtDNA is 67.0% A＋T （A 25.9%, C 10.5%, G 22.5%, and T 41.1%）. This value is higher than that for many invertebrate mitochondrial genomes. Only 19 putative tRNA genes are present in S. constricta and 27 noncoding regions, of which two are large in size. The trnE and trnW genes as well as a second trnS were absent in S. constricta. The gene arrangement of S. constricta is different from the other Bivalvia genomes.

关键词： Sinonovacula constricta Mitochondrial DNA

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THE AMAZING MIOCENE TRACE FOSSILS OF LABUAN ISLAND, OFF WEST SABAH, MALAYSIA

THE AMAZING MIOCENE TRACE FOSSILS OF LABUAN ISLAND, OFF WEST...

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第二届国际古生物学大会

作者： Chai Peng LEE Kok Thye YAP Department of Geology University of Malaya 50603 Kuala Lumpur Malaysia. Geoscience Department ExxonMobil Exploration and Production Malaysia Inc. Menara ExxonMobil Kuala Lumpur City Centre50088 Kuala Lumpur Malaysia

Trace fossil assemblages of 58 forms belonging to 42 ichnogenera are found in the Tertiary sequence of Labuan Island, off the west coast of Sabah, Malaysia, north Borneo. Nine new ichnospecies and three new icnhogenera were described by K. T. Yap in 1980. This sequence consists of a Lower Miocene Temburong Formation turbidite unit that grades laterally and vertically into the Middle Miocene pelagic Setap Shale that in turn grades into the shallow marine to fluviatile Middle to Upper Miocene Belait Formation.

关键词： Miocene trace fossils Labuan Malaysia

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Analysis of China's Petroleum Import and Export

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China Oil & Gas 2013年第1期20卷 42-46页

作者： Zhang Kang Lu Xuemei SINOPEC Petroleum exploration and Development Research Institute

(from No.4, 2012 )Countermeasures for more oil and gas imports China’s imports of oil and gas may both take the lead in the world A rapid inc.ease of petroleum consumption in China is almost inevitable and any attemp... 详细信息

关键词：中国政府石油消费进出口分析原油进口能源统计天然气世界

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Inversion of 3D density interface with PSO-bp method

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Global Geology 2016年第1期19卷 33-40页

作者： ZHANG Dailei ZHANG Chong College of Geo-exploration Science and Technology Jilin University

bp( Back Propagation) neural network and PSO( Particle Swarm Optimization) are two main heuristic optimization methods,and are usually used as nonlinear inversion methods in geophysics. The authors applied bp neural network and bp neural network optimized with PSO into the inversion of 3D density interface respectively,and a comparison was drawn to demonstrate the inversion results. To start with,a synthetic density interface model was created and we used the proceeding inversion methods to test their effectiveness. And then two methods were applied into the inversion of the depth of Moho interface. According to the results,it is clear to find that the application effect of PSO-bp is better than that of bp network. The bp network structures used in both synthetic and field data are consistent in order to obtain preferable inversion results. The applications in synthetic and field tests demonstrate that PSO-bp is a fast and effective method in the inversion of 3D density interface and the optimization effect is evident compared with bp neural network merely,and thus,this method has practical value.

关键词： inversion 3D density interface Moho interface bp neural network particle swarm optimization

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Hydrogen embrittlement of retrogression-reaged 7xxx-series aluminum alloys-a comprehensive review

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Science China Materials 2024年第11期67卷 3468-3490页

作者： Mohamed Qassem Amir Ershad Fanaei Mousa Javidani Department of Applied Science University of Quebec at ChicoutimiSaguenayQCG7H 2B1Canada Canadian Materials Testing Bureau inc. Montreal(QC)H1V 2T4Canada

Hydrogen embrittlement remains a crucial concern in industries that rely on high-strength *** to hydrogen poses a significant threat to the mechanical integrity of such *** review article briefly discusses the fundamentals of hydrogen embrittlement,inc.uding its mechanisms and the effects of various factors,such as chemical composition and environmental *** heat treatments have been developed to eliminate the risk of hydrogen *** various suggested heat treatments,the retrogression-reaging(RRA)treatment has proven effective in optimizing the balance between mechanical properties and resistance to hydrogen *** review highlights the role of RRA treatment in modifying the microstructure of Al-Zn-Mg alloys to enhance their ability to resist hydrogen embrittlement,building on existing *** interesting aspect explored in this article is the intricate relationship between pre-deformation and subsequent RRA ***,the review discusses the use of RRA as a post-weld heat treatment to mitigate the susceptibility of weldments to hydrogen embrittlement.A comprehensive exploration of these topics is beneficial for a thorough understanding of the multifaceted functions of RRA ***,despite its advantages,the widespread adoption of RRA treatment in the industry is hindered by certain *** review addresses these challenges,offering insights into the latest strategies to overcome them.

关键词： retrogression-reaging treatment hydrogen embrittlement pre-deformation weldments

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Electrochemical treatment of olive mill wastewater:Treatment extent and effluent phenolic compounds monitoring using some uncommon analytical tools

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Journal of Environmental Sciences 2013年第1期25卷 220-230页

作者： Chokri Belaid Moncef Khadraoui Salma Mseddi Monem Kallel Boubaker Elleuch Jean Franois Fauvarque Laboratory of Water Energy and Environment Sfax UniversityENIS BP "1173" 3038 Sfax Tunisia Laboratory of Industrial Electrochemistry CNAM 2 Rue Conté 75003 Paris France

Problems related with industrials effluents can be divided in two parts：（1） their toxicity associated to their chemical content which should be removed before discharging the wastewater into the receptor media; （2） and the second part is linked to the difficulties of pollution characterisation and monitoring caused by the complexity of these matrixes. This investigation deals with these two aspects, an electrochemical treatment method of an olive mill wastewater （OMW） under platinized expanded titanium electrodes using a modified Gl＂ignard reactor for toxicity removal as well as the exploration of the use of some specific analytical tools to monitor effluent phenolic compounds elimination. The results showed that electrochemical oxidation is able to remove/mitigate the OMW pollution. Indeed, 87% of OMW color was removed and all aromatic compounds were disappeared from the solution by anodic oxidation. Moreover, 55% of the chemical oxygen demand （COD） and the total organic carbon （TOC） were reduced. On the other hand, UV- Visible spectrophotometry, Gaz chromatography/mass spectrometry, cyclic voltammetry and 13C Nuclear Magnetic Resonance （NMR） showed that the used treatment seems efficaciously to eliminate phenolic compounds from OMW. It was concluded that electrochemical oxidation in a modified Grignard reactor is a promising process for the destruction of all phenolic compounds present in OMW. Among the monitoring analytical tools applied, cyclic voltammetry and 13C NMR are among the techniques that are introduced for the first time to control the advancement of the OMW treatment and gave a close insight on polyphenols disappearance.

关键词： olive mill wastewater electro-oxidation polyphenols cyclic voltammetry GC/MS 13C NMR

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