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Diagenetic evolution and reservoir quality of the Oligocene sandstones in the Baiyun Sag, Pearl River Mouth Basin, South China Sea

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Acta Oceanologica Sinica 2024年第2期43卷 67-82页

作者： Bing Tian Shanshan Zuo Youwei Zheng Jie Zhang Jiayu Du Jun tang Institute of Mining and Coal Inner Mongolia University of Science and TechnologyBaotou 014010China Institute of Science Inner Mongolia University of Science and TechnologyBaotou 014010China

The Oligocene Zhuhai sandstones are significant reservoirs for hydrocarbons in the Baiyun Sag, South China *** effective appraisal, exploration and exploitation of such a deep-water hydrocarbon sandstone, samples of five wells from depths of 850 m to 3 000 m were studied. A series of comprehensive petrographic and geochemical analyses were performed to unravel the diagenetic features and their impact on the reservoir ***, the sandstones are dominated by feldspathic litharenites and lithic arenites with fine to medium grain sizes and moderate to good sorting. The reservoir quality varies greatly with a range of porosity from 0.2% to 36.1% and permeability from 0.016 ×10~(–3) μm~2 to 4 301 ×10~(–3) μm~2, which is attributed to complex diagenetic evolution related to sedimentary facies;these include compaction, cementation of calcite, dolomite, siderite and framboidal pyrite in eogenetic stage;further compaction, feldspar dissolution, precipitation of ferrocalcite and ankerite, quartz cements, formation of kaolinite and its illitization, precipitation of albite and nodular pyrite, as well as hydrocarbon charge in mesogenetic stage. The dissolution of feldspar and illitization of kaolinite provide internal sources for the precipitation of quartz cement, while carbonate cements are derived from external sources related to interbedded mudstones and deep fluid. Compaction is the predominant factor in reducing the total porosity, followed by carbonate cementation that leads to strong heterogeneity. Feldspar dissolution and concomitant quartz and clay cementation barely changes the porosity but significantly reduces the *** high-quality reservoirs can be concluded as medium-grained sandstones lying in the central parts of thick underwater distributary channel sandbodies(>2 m) with a high content of detrital quartz but low cement.

关键词： Baiyun Sag Oligocene Zhuhai Formation diagenesis reservoir quality

The environmental analysis and site selection of mussel and large yellow croaker aquaculture areas based on high resolution remote sensing

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Acta Oceanologica Sinica 2024年第3期43卷 66-86页

作者： Lina Cai Jie Yin Xiaojun Yan Yongdong Zhou Rong tang Menghan Yu Marine Science and Technology College Zhejiang Ocean UniversityZhoushan 316022China Zhejiang Marine Fisheries Research Institute Zhejiang Ocean UniversityZhoushan 316004China

Mussel aquaculture and large yellow croaker aquaculture areas and their environmental characteristics in Zhoushan were analyzed using satellite data and in-situ surveys.A new two-step remote sensing method was proposed and applied to determine the basic environmental characteristics of the best mussel and large yellow croaker aquaculture *** methodology includes the first step of extraction of the location distribution and the second step of the extraction of internal environmental *** fishery ranching index(FRI1,FRI2)was established to extract the mussel and the large yellow croaker aquaculture area in Zhoushan,using Gaofen-1(GF-1)and Gaofen-6(GF-6)satellite data with a special resolution of 2 *** the second step,the environmental factors such as sea surface temperature(SST),chlorophyll a(Chl-a)concentration,current and tide,suspended sediment concentration(SSC)in mussel aquaculture area and large yellow croaker aquaculture area were extracted and analyzed in *** results show the following three points.(1)For the extraction of the mussel aquaculture area,FRI1 and FRI2 are complementary,and the combination of FRI1 and FRI2 is suitable to extract the mussel aquaculture *** for the large yellow croaker aquaculture area extraction,FRI2 is suitable.(2)Mussel aquaculture and the large yellow croaker aquaculture area in Zhoushan are mainly located on the side near the islands that are away from the eastern open *** water environment factor template suitable for mussel and large yellow croaker aquaculture was determined.(3)This two-step remote sensing method can be used for the preliminary screening of potential site selection for the mussels and large yellow croaker aquaculture area in the *** fishery ranching index(FRI1,FRI2)in this paper can be applied to extract the mussel and large yellow croaker aquaculture areas in coastal waters around the world.

关键词： mussel aquaculture area large yellow croaker aquaculture area high resolution satellite site selection environmental analysis

Differential CircRNA Expression Profiles in PK-15 Cells Infected with Pseudorabies Virus Type Ⅱ

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Virologica Sinica 2021年第1期36卷 75-84页

作者： Haimin Li Wen tang Yulan Jin Weiren Dong Yan Yan Jiyong Zhou MOA Key Laboratory of Animal Virology Center of Veterinary SciencesZhejiang UniversityHangzhou 310058China

Circular RNAs(circ RNAs)belong to a class of non-coding RNAs with diverse biological ***,little is known about their roles in case of pseudorabies virus(Pr V)***,we analyzed the expression profile of host circ RNAs from a virulent Pr V type II strain DX(Pr V-DX)infected and an attenuated g E/TK deficient(g E-TK-Pr V)strain of Pr V infected PK-15 *** RNAs were identified by findcirc and analyzed with DESeq *** with the mock cells,449 differentially expressed(DE)circ RNAs(233 down-regulated and 216 up-regulated)from Pr V-DX infected and578 DE circ RNAs(331 down-regulated and 247 up-regulated)from g E-TK-Pr V infected PK-15 cells were *** addition,459 DE circ RNAs(164 down-regulated and 295 up-regulated)between the Pr V-DX and g E-TK-Pr V infected cells were *** expression patterns of 13 circ RNAs were validated by reverse transcription quantitative real-time PCR(RT-q PCR)and results were similar as of *** putative target mi RNA binding sites of DE circ RNAs were predicted by using mi Randa and ps *** circ RNA-mi RNA-m RNA network was constructed and certain mi RNAs that have possible roles in antiviral immune response,such as mi R-210 and mi R-340,were *** and KEGG pathway analysis demonstrated that DE circ RNAs were enriched in the processes such as cellular metabolism,protein binding,RNA degradation and regulation of actin ***,these findings might provide the useful information for a better understanding of mechanisms underlying the interaction between Pr V-II and host cells.

关键词： Pseudorabies virus infection RNA-seq CircRNA

Effects of annealing and firing in wet hydrogen on the dielectric breakdown strengths of alumina ceramics

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Journal of Advanced Ceramics 2020年第2期9卷 173-182页

作者： Jishi DU Binghua tang Wei LIU Tao ZhANG Jiagen PENG Hu CHEN Yangjun LEI Institute of Electronic Engineering China Academy of Engineering PhysicsMianyang621900China Department of Materials Science Sichuan UniversityChengdu610064China

Annealing and firing in wet hydrogen are widely used steps in the processing *** insulators that may affect their dielectric breakdown strengths(DBS).In this study,the effects of annealing(at 1300℃for 7 h)and firing in wet hydrogen on the DBS of alumina ceramics(all sintered at 1650℃)were studied,and the underlying mechanisms were analyzed by material *** reduced the DBS of the 95%alumina ceramics due to the inter-granular phase crystallization,and the reduction in the DBS could be correlated to the reduction in mechanical *** contrast,annealing improved the DBS of the 99%alumina ceramic without intergranular phase *** in wet hydrogen at 1500℃caused the DBS increment,which can be ascribed to the reduction in the concentrations of point defects and electrical carriers.

关键词： alumina ceramic dielectric breakdown strength(DBS) inter-granular phase crystallization firing in wet hydrogen

Suppression of low-frequency ultrasound broadband vibration using star-shaped single-phase metamaterials

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Defence Technology（防务技术） 2024年第4期34卷 217-224页

作者： Rui Zhao Jian Zheng Jin Guo Yunbo Shi Hengzhen Feng Jun tang Jun Liu Science and Technology on Electronic Test&Measurement Laboratory North University of ChinaTaiyuan 030051ShanxiChina School of Mechatronical Engineering Beijing Institute of TechnologyBeijing 100081China

In order to suppress the low-frequency ultrasound vibration in the broadband range of 20 k Hz—100 k Hz,this paper proposes and discusses an acoustic metamaterial with low-frequency ultrasound vibration attenuation properties,which is configured by hybrid arc and sharp-angle convergent star-shaped *** effect of the dispersion relation and the bandgap characteristic for the scatterers in star-shaped are simulated and *** target bandgap width is extended by optimizing the geometry parameters of arc and sharp-angle convergent *** proposed metamaterial configured by optimized hybrid lattices exhibits remarkable broad bandgap characteristics by bandgap complementarity,and the simulation results verify a 99%vibration attenuation amplitude can be obtained in the frequency of20 k Hz—100 k *** the fabrication of the proposed hybrid configurational star-shaped metamaterial by 3D printing technique,the transmission loss experiments are performed,and the experimental results indicate that the fabricated metamaterial has the characteristics of broadband vibration attenuation and an amplitude greater than 85%attenuation for the target *** results demonstrate that the hybrid configurational star-shaped metamaterials can effectively widen the bandgap and realize high efficiency attenuation,which has capability for the vibration attenuation in the application of highprecise equipment.

关键词： Star-shaped metamaterials Broadband Vibration attenuation Low-frequency ultrasound vibration Transmission loss

Comparisons and Improvements of Key Operating Characteristics of Current Source Converter Applied in HVDC System

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CSEE Journal of Power and Energy Systems 2023年第5期9卷 1601-1612页

作者： Wenwen Zhang Longlong Chen Xiaoguang Wei Guangfu tang Lei Qi Chong Gao Zhiyuan He the North China Electric Power University Beijing 102206China the State Key Laboratory of Advanced Power Transmission Technology Beijing Institute Of Smart EnergyBeijing 102206China the State Grid Smart Grid Research Institute Co.Ltd Beijing 102209China

Because of its controlled power factor and no commutation failure,current source converter(CSC)made up of reverse-blocking IGCTs(RB-IGCTs)offers broad application prospects in the field of HVDC *** voltage and power operating range as the most important operating characteristics should be paid attention to but they are always ***,the relationship between valve voltage and modulation index is *** particular,valve voltage of converter under the three typical modulation methods is compared,analyzed,and ***,with the help of the independent control strategy and coordinated control strategy of both ends,power operating ranges of the three modulation methods are comprehensively analyzed and ***,in order to solve power coupling at a low active power,the improved coordination control strategy at both ends in this paper is proposed and the relationships among active power,reactive power,DC current and phase angle difference are given in ***,a 500 kV/3 kA simulation system was built in PSCAD/EMTDC to obtain comparison results of the key operating characteristics of CSC under different modulation methods and the converter can realize unity power operation under random active power after adopting the improved coordinated control strategy,and DC current does not decrease to zero,verifying effectiveness of the coordinated control strategy.

关键词： Current source converter improved coordinated control strategy reverse-blocking IGCT valve voltage

A CO and CO2 tolerating (La0.9Ca0.1)2(Ni0.75Cu0.25)O4+δ Ruddlesden-Popper membrane for oxygen separation

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Frontiers of Chemical Science and Engineering 2020年第3期14卷 405-414页

作者： Guoxing Chen Marc Widenmeyer Binjie tang Louise Kaeswurm Ling wang Armin Feldhoff Anke Weidenkaff Institute of Materials Science Technische Universität Darmstadt64287 DarmstadtGermany Institute of Physical Chemistry and Electrochemistry Leibniz Universität Hannover30167 HannoverGermany Institute for Materials Science Universität Stuttgart70569 StuttgartGermany Fraunhofer Institute IWKS 63457 HanauGermany

A series of novel dense mixed conducting ceramic membranes based on K2NiF4-type(La1-xCax)2(Ni0.75Cu0.25)O4+δwas successfully prepared through a sol-gel *** chemical compatibility,oxygen permeability,CO and CO2 tolerance,and long-term CO2 resistance regarding phase composition and crystal structure at different atmospheres were *** results show that higher Ca contents in the material lead to the formation of CaCO3.A constant oxygen permeation flux of about 0.63 mL·min−1·cm−2 at 1173 K through a 0.65 mm thick membrane was measured for(La0.9Ca0.1)2(Ni0.75Cu0.25)O4+δ,using either helium or pure CO2 as sweep *** oxygen fluxes with no sign of deterioration of this membrane were observed with increasing CO2 *** membrane showed excellent chemical stability towards CO2 for more than 1360 h and phase stability in presence of CO for 4 h at high *** addition,this membrane did not deteriorate in a high-energy CO2 *** present work demonstrates that this(La0.9Ca0.1)2(Ni0.75Cu0.25)O4+δmembrane is a promising chemically robust candidate for oxygen separation applications.

关键词： K2NiF4 structure oxygen permeation membrane CO2 and CO resistances CO2 plasma resistance long-term robustness

Technological breakthroughs and scientific progress of the Chang'e-4 mission

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Science China(Information Sciences) 2020年第10期63卷 5-18页

作者： Weiren WU Dengyun YU Chi waNG Jizhong LIU Yuhua tang He ZHANG Zhe ZHANG Lunar Exploration and Space Engineer Center China Aerospace Science and Technology Corporation National Space Science Center Chinese Academy of Sciences Institute of Spacecraft System Engineer China Academy of Space Technology

Chang’e-4 is the first man-made probe that accomplished landing and roving on the far side of the Moon, which is viewed as a new milestone in the history of Lunar exploration. Beginning with a brief introduction to the progress of domestic and foreign Lunar exploration, this paper reviews the implementation process of the Chang’e-4 project, sorts out the technical breakthroughs achieved, summarizes the exploration achievements, and provides references for subsequent Lunar exploration.

关键词： Chang’e-4 Moon’s far side soft landing Earth-Moon L2 point relay satellite technological breakthrough scientific achievement

Contribution and Prospect of Erect Panicle Type to Japonica Super Rice

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Rice science 2021年第5期28卷 431-441页

作者： Chen Sibo tang Liang Sun Jian Xu Quan Xu Zhengjin Chen Wenfu Rice Research Institute Shenyang Agricultural University/Key Laboratory of Northern geng Super Rice BreedingMinistry of EducationShenyang 110866China

Over the past 30 years,super rice played an important role in boosting rice *** phenotype of erect panicle(EP)architecture controlled by dense and erect panicle 1(dep1)is the typical characteristic of super rice,and the phenotype has been used in rice breeding for nearly a *** this review,the molecular genetic basis of EP phenotype,and mechanism of how dep1 affects rice carbon,nitrogen metabolism and grain quality(grain shape and taste quality)were *** addition,we discussed the possible improvement strategies of rice yield and *** review provides a quick overview of the whole process for rice quality formation,as well as suggestions and ideas for future research on rice quality improvement.

关键词： dep1 nitrogen cycle carbon cycle metabolic balance rice quality erect panicle super rice