检索结果-南通市图书馆

Fault-line selection and fault-type recognition in DC systems based on graph theory

在线全文

学校读者我要写书评

暂无评论

Protection and Control of Modern Power Systems 2018年第1期3卷 276-285页

作者： Yan Xu jingyan liu Yuan Fu State Key Laboratory of New Energy and Electric Power Systems North China Electric Power UniversityBaoding 071003HebeiChina

When a fault occurs in a DC system,the fault current rises rapidly with no zero-crossing point which makes fault-line selection and fault-type identification *** this paper,an online detection and protection method based on graph theory,namely the“double D method”,is proposed for fault-line selection and fault-type identification in DC *** the proposed method,the entire distribution network is visualized as a“map”with vertices representing the line convergence points and edges representing the connection lines.A network topology matrix“D”is formed by detecting the current directions as the current directions are altered following a fault,whereas the current directions at the ends of non-fault lines remain the *** order to prevent misjudgment problems arising from power flow reversal,the rates of change of the fault currents are used to further determine whether a fault has occurred and the“double D method”is introduced to identify the fault *** results with different fault types verify the effectiveness and reliability of the proposed method.

关键词： Network topology matrix Double D method Fault-line selection Fault-type identification Graph theory

The U-Pb chronologic evidence and sedimentary responses of Silurian tectonic activities at northeastern margin of Tarim Basin

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 2012年第9期55卷 1445-1460页

作者： liu jingyan YANG HaiJun YANG YongHeng CAI ZhenZhong liu YongQuan RUI ZhiFeng SU ZhenZhen Ministry of Education's Key Laboratory of Marine Reservoir Evolution and Oil&Gas Accumulation Mechanism China University of GeosciencesBeijing 100083China Institute of Petroleum Exploration and Exploitation Tarim Oil Field CompanyPetroChinaKorla 841000China

U-Pb ages of Devonian detrital zircons from Tabei Uplift have been determined through LA-ICP-MS test *** results revealed that most zircon ages concentrate on 460-414 Ma,especially around 436-423 Ma,indicating possible occurrences of strong tectonic events at the northern margin of Tarim Basin during that *** with previous researches on the basin marginal orogenic belts,intense tectonic activities developed at the northeast margin of Tarim Basin and its obvious sedimentary responses in basin during the end of Ordovician to Early-Middle Silurian are *** include(1) several unconformities within the Late Ordovician-Silurian,showing truncation,erosion,and onlap characteristics,which reflected the local uplift formed during the surrounding extrusion process;(2) the Silurian fluvial delta system from northeast to southwest in Keping,Yingmaili,Hade,and Caohu areas,which reflected the partial uplift at the northeast margin and provided clastic supply to basin;and(3) as indicated by heavy mineral analysis,the Silurian sediments came mainly from the recycles of orogenic belts provenance,which indicated the compress tectonic *** addition,a wide range of red mudstone layer distribution in the upper part of the Silurian may be closely related to the surrounding tectonic uplift and the rapid decline of sea levels.

关键词： detrital zircon U-Pb geochronology tectonic activities Silurian northeastern margin of Tarim Basin

The determination of sedimentary environment and associated energy in deep-buried marine carbonates:insights from natural gamma ray spectrometry log

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2024年第1期18卷 204-218页

作者： jingyan liu Qian CHANG Junlong ZHANG Hui CHAI Feng HE Yizan YANG Shiqiang XIA School of Energy Resources China University of Geosciences(Beijing)Beijing 100083China Exploration and Development Research Institute Daqing Oilfield CompanyPetroChinaDaqing 163712China China National Oil and Gas Exploration and Development Co. Ltd(CNODC)Beijing 100032China Beijing Research Institute of Uranium Geology Beijing 100029China College of Mining Engineering North China University of Science and TechnologyTangshan 063210China

It has always been challenging to determine the ancient sedimentary environment and associated energy in deep-buried marine *** energy represents the hydrodynamic conditions that existed when the carbonates were *** energy includes light and chemical energies in compounds and kinetic energy in currents and mass ***-buried marine carbonates deposited during the Ordovician depositional period in the eastern Tarim Basin result from a complex interplay of tectonics,sedimentation,and *** a result,determining the ancient sedimentary environment and associated energy is *** natural gamma-ray spectrometry(GRS)log(from 12 wells)is used in this paper to conduct studies on the sedimentary environment and associated energy in deep-buried marine *** findings show that the values of thorium(Th),uranium(U),potassium(K),and gamma-ray without uranium(KTh)in a natural GRS log can reveal lithological associations,mineral composition,diagenetic environment,stratigraphic water activity,and ancient climatic *** the Ordovician,quantitative analysis and determination of sedimentary environment energy are carried out using a comprehensive calculation of natural GRS log parameters in typical wells(penetrating through the Ordovician with cores and thin sections)of well GC4,well GC6,well GC7,and well *** results show that GRS log can determine different lithology associations in typical wells than a sieve residue ***,cores and thin sections can be used to validate the determination of lithology *** on the determination of lithology associations,the lithology associations that reflect the sedimentary environment and associated energy can be analyzed in a new ***,the sedimentary environment energy curve derived from a natural GRS log can reveal hydrodynamic fluctuations during depositional periods,which will aid in the discovery of carbonate reservoirs,establishing sequence stratigra

关键词： ancient sedimentary environment energy of sedimentary environment marine deep-buried carbonates natural GRS the Ordovician eastern Tarim Basin

Design of NV color center fluorescence signal acquisition circuit based on FPGA architecture

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Optoelectronics Letters 2024年第12期20卷 721-727页

作者： ZENG Sen YANG Shuqiang liu jingyan ZHAO Chuang SHANG Zhengguo HE Xianming Key Laboratory of Optoelectronic Technology and Systems Ministry of Education of ChinaChongqing UniversityChongqing 400044China College of Physics and Electronics Information Luoyang Normal UniversityLuoyang 471934China School of Electrical Engineering Chongqing University of Science and TechnologyChongqing 401331China

Nitrogen-vacancy(NV)quantum defects in diamond are sensitive detectors of magnetic *** rapid development of NV-center magnetic sensor has higher requirements for high-speed and high-precision data acquisition,weak signal detection and ***,the existing sensing technologies based on diamond NV centers rely on bulky and expensive instruments,which must be replaced by a more compact *** we combine NV quantum sensing technology with integrated circuit technology to create a compact and easy-to-operate platform,which includes microwave source module,transistor-transistor logic(TTL)modulation module,digital lock-in amplifier(DLIA)module,*** order to confirm the reliability of the experimental platform,we not only tested the performance of each individual module,but also carried out optical detection magnetic resonance(ODMR)*** this platform,we can obtain a magnetic sensitivity of 465 nT/Hz^(1/2).This experimental platform with convenient operation and low noise has the potential to become an independent magnetic measuring instrument.

关键词： center centers fir

Superhydrophobic MXene‑Based Fabric with Electromagnetic Interference Shielding and Thermal Management Ability for Flexible Sensors

在线全文

学校读者我要写书评

暂无评论

Advanced Fiber Materials 2023年第6期5卷 2099-2113页

作者： Jun Peng Haonan Cheng jingyan liu Weiyi Han Tao Wu Yunjie Yin Chaoxia Wang College of Textile Science and Engineering Jiangnan University1800 Lihu RoadWuxi 214122People’s Republic of China College of Textile and Fashion Hunan Institute of EngineeringXiangtan 411104People’s Republic of China

Smart fabrics have made remarkable progress in the field of wearable electronics because of their unique structure,flexibility and breathability,which are highly desirable with integrated ***,a superhydrophobic smart fabric has been fabricated by decorating conductive MXene on nylon fabric modified by polydopamine(PDA),followed by spraying hydrophobic materials(SiO_(2) and FOTS).The hydrophobic layer not only provides the fabric with superhydrophobicity,but also protects MXene from *** conductive MXene-wrapped fibers endow the fabric with adjustable conductivity and many satisfactory ***,the smart fabric possesses sensing performances of ultralow detection limit(0.2%strain),fast response time(60 ms),short recovery time(90 ms),and outstanding sensing stability(5000 cycles).These sensing performances allow the smart fabric to accurately detect body respiratory signals in the running state,exercise state and sleep state,thus keeping track of respiratory health ***,the smart fabric also exhibits outstanding EMI shielding effectiveness(66.5 dB)in the X-band,satisfactory photothermal performance(68.6℃at 100 mW/cm2),and excellent electrothermal conversion capability(up to 102.3℃at 8 V).Therefore,the smart fabric is extremely promising for applications in EMI shielding,thermal management,and respiratory monitoring,and is an ideal candidate for smart clothing and as a medical diagnostic tool.

关键词： Superhydrophobicity Electromagnetic interference shielding Respiratory monitoring Thermal management

Paleostructural geomorphology of the Paleozoic central uplift belt and its constraint on the development of depositional facies in the Tarim Basin

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 2009年第6期52卷 823-834页

作者： LIN ChangSong YANG HaiJun liu jingyan PENG Li CAI ZhenZhong YANG XiaoFa YANG YongHeng School of Energy Resources China University of GeosciencesBeijing 100083China Petroleum Exploration and Production Institute Sino-Petroleum and Chemistry CooperationBeijing 100083China

Inclined eastward and consisting of the Hetianhe, Hetianhedong, Tazhong paleouplifts and Bachu paleoslope, the central paleouplift belt in the Tarim Basin was a large composite paleouplift and paleoslope belt with complicated palaeogeomorphic features during the Middle to early Late Ordovician. A number of paleostructural geomorphic elements have been identified in the paleouplift belt and surrounding areas, such as the high uplift belts, the faulted uplift platforms, the marginal slopes and slope break zones flanking the paleouplift belt, the surrounding shelf slopes or low relief ramps, the shelf slope break zones and deep basin plains. They exerted great influence on the development of paleogeography of the basin. The marginal slopes and slope break zones flanking the uplift belt constrained the formation and deposition of the high-energy facies including reefal and shoal deposits during the Late Ordovician, which comprise the major reservoirs of the Lower Paleozoic in the basin. Toward the end of the Ordovician, the Tazhong paleouplift hinged westward and became a westward-dipped nose as the southeastern margin of the basin was strongly compressed and uplifted. The tectono-paleogeomorphic framework of the central northern basin during the Early Silurian and the Late Devonian to Early Carboniferous changed remarkably in topography from the initial low in east and high in west to high in northeast and low in southwest. The major paleogeomorphic elements developed in these periods included the strong eroded uplift high, the uplift marginal slope, the gentle ramp of the depression margin and the depression belt. The sandstones of the lowstand and the early transgressive systems tracts were deposited along the uplift marginal slopes and the gentle ramps of the depressions comprise the prolific reservoirs in the basin. The study indicates that the distribution patterns of the unconformities within the basin are closely related to the paleogeomorphic features and evolu

关键词： palaeostructural geomorphology unconformity distribution patterns central paleouplift belt Tarim Basin

Study on the mechanical properties of outwash deposits with random structure method

在线全文

学校读者我要写书评

暂无评论

Transportation Safety and Environment 2021年第3期3卷 316-330页

作者： Chaojun Jia Qiang Zhang Mingfeng Lei Jun Yu Rubin Wang jingyan liu School of Civil Engineering Central South UniversityChangsha410075China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water ResourcesBeijing100048China China Institute of Water Resources and Hydropower Research Beijing100048China School of Transportation and Civil Engineering Nantong UniversityNantong226019China Research Institute of Geotechnical Engineering Hohai UniversityNanjing210098China College of Water Resources Science and Engineering Taiyuan University of TechnologyTaiyuan030024China

Outwash deposit is one of the major threats to the safety and stability of railway transit engineering in the Sichuan–Tibet *** this paper,different samples of outwash deposits were prepared based on the random structure method,and a series of large-scale direct shear tests were carried out under different normal *** influence of stone content and the spatial distribution of stone blocks on the physical and mechanical properties of outwash deposits were *** results show that with the increase of stone content,the shear stress-displacement curve changs from strain softening to strain *** shear zone is larger,and its shape is more tortuous due to the movement and rotation of stone *** internal frictional angle increases linearly while the cohesion diseases with the increase of stone *** main influence of the spatial distribution of stone blocks on the mechanical properties of outwash deposits is the peak *** shear zone is mainly determined by the distribution of the stone blocks near the shear zone.

关键词： outwash deposit mechanical property random mesostructure discrete-element method direct shear test

Depositional architecture and developing settings of large-scale incised valley and sub-marine gravity flow systems in the Yinggehai and Qiong-dongnan basins,South China Sea

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2001年第8期46卷 690-693页

作者： LIN Changsong liu jingyan CAI Shixiang ZHANG Yanmei LU Ming LI Jie China University of Geosciences Beijing 100083China West Nanhai Oil Company Zhanjiang 524000China

In the Ying-Qiong basins in the South China Sea developed a set of giant inner shelf slope and submarine gravity flow deposits in the Ying-Huang formations since the Late Miocene. These deposits can be classified into 9 sequences in which slope slump-debris flow, slope fan and particularly, the large-scale axial basin-floor incised valley fills have been recognized. They were distributed in a distinctive pattern attributed to tectonic control. The development ofshelf slopes and abyssal plains in the basins was related to the last episode of rapid subsidence and a large amount of sediment inputs. Large-scale basin-floor incised valleys, formed during the late Miocene and Pliocene, indicate several major sea level falls that occurred in the South China Sea.

关键词： incised valleys gravity flow systems Ying-Qiong basins.

Sedimentary characteristics and depositional evolution of carbonate platform during the Cambrian and Ordovician in eastern Tarim Basin,NW China

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2023年第2期17卷 470-486页

作者： jingyan liu Shiqiang XIA Junlong ZHANG Feng HE Yuhan CHENG Yi ZHU Zhaoqin CHEN Huoxiang DONG School of Energy Resources China University of Geosciences(Beijing)Beijing 100083China College of Mining Engineering North China University of Science and TechnologyTangshan 063210China Exploration and Development Research Institute Daqing Oilfield CompanyPetroChinaDaqing 163712China Beijing Research Institute of Uranium Geology Beijing 100029China

The eastern Tarim Basin(Tadong Area)has gained wide attentions on large-scale marine carbonate reservoirs in Cambrian-Ordovician due to significant hydrocarbon discoveries.A systematic analysis combining thin sections,cores,wireline logs,and seismic data is conducted on Cambrian-Ordovician carbonate platform in the whole eastern Tarim Basin,including Gucheng area,Majiaer area,and western Luobopo rise(Luoxi area).The results show that 8 sub-facies and more than 10 microfacies are developed including open platform,restricted/semi-restricted platform,reef-shoal around platform margin,drowned platform,foreslope,neritic platform,and deep-water *** both key areas for hosting petroleum reserves during the Cambrian and Ordovician,the Luoxi area is dominated by deep-water basin facies,while the Gucheng area is dominated by neritic platform facies and deep-water basin facies during the Lower *** deposition evolution during the whole Cambrian is dominated by slope facies and deep-water facies,platform margin facies,and platform *** contrast,it is dominated by open platform facies during the whole *** depositional evolution of carbonate platform is mainly controlled by paleo-geomorphology and sea-level *** distribution of paleo-geomorphologic units plays an important role in controlling types and distributions of carbonate platform *** transgression assists in growth of reef-shoal complex and lime mud mound in the Early ***,with neritic platform and slope being to disappeared,in the Middle Ordovician,platform margin facies are well developed in Gucheng *** facies and deepwater basin facies are widely ***,carbonate platform is drowned due to sea level rising in the Late *** depositional evolution of carbonate platform coinciding falling and rising of sea-level changes can be beneficial for appropriate carbonate reservoirs identification and petroleum exploration.

关键词： carbonate platform depositional evolution sedimentary facies Tarim Basin the Cambrian-Ordovician