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Multi-gas co-production from deep-water shallow hydrates and underlying free gas:A numerical study of coupled production dynamics and secondary hydrate formation 认领 引用
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作者 Cong Li Na Wei +10 位作者 Hai-tao Li Shou-wei Zhou Lie-hui Zhang Jin-zhou Zhao Bjørn Kvamme Zhong-xia Wang Di Nie Qing He Jun Wang Zhi-hao Xia Yu Qin 《China Geology》 CAS CSCD 2026年第3期567-583,共17页
The co-occurrence of marine gas hydrates,shallow gas,and deep oil and gas has been widely recognized,offering favorable conditions for integrated resource development.This study aims to explore the coupled production ... The co-occurrence of marine gas hydrates,shallow gas,and deep oil and gas has been widely recognized,offering favorable conditions for integrated resource development.This study aims to explore the coupled production dynamics of shallow gas hydrates and underlying free gas to support the industrialization of marine natural gas hydrate resources.A productivity prediction model for the combined extraction of hydrate and underlying gas is developed,integrating multi-physics coupling mechanisms.Using logging data from two test wells in the Qiongdongnan Basin,a short-term physical model is constructed to simulate and predict production performance.Results show that:(1)The average wellhead gas production rate increases significantly with a linear relationship to the production pressure differential;(2)pressure propagation differs notably between hydrate and free gas layers,with a distinct low-temperature zone forming near the wellbore in the hydrate-bearing layer;(3)free gas migration results in a high-saturation gas zone near the hydrate-gas interface,and elevated pressure differentials can trigger secondary hydrate formation;and(4)during short-term testing,hydrate decomposition is limited,with most gas production sourced from the underlying gas layer.By adjusting production pressure or controlling wellbore temperature,hydrate decomposition and reformation can be balanced to optimize recovery efficiency.This study highlights a novel multi-gas co-production approach and provides a theoretical basis for sustainable deepwater hydrate development. 展开更多
关键词 Natural gas hydrate Combustible ice Unconventional energy Clean Energy Underlying free gas Deep-water shallow hydrate Multi-gas joint-development Deep oil and gas Numerical simulation
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Composite whole petroleum system and orderly distribution of natural gas in deep-water strongly active basins in northern South China Sea:A case study of Qiongdongnan Basin,China 认领 引用 被引量：1
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作者 PEI Jianxiang JIA Chengzao +2 位作者 HU Lin JIANG Lin XU Changgui 《Petroleum Exploration and Development》 SCIE 2025年第6期1421-1438,共18页
Under the guidance of the whole petroleum system theory,using seismic,drilling and laboratory analysis data,and combined with the practical achievements of oil and gas exploration,the distribution patterns of differen... Under the guidance of the whole petroleum system theory,using seismic,drilling and laboratory analysis data,and combined with the practical achievements of oil and gas exploration,the distribution patterns of different types of natural gas in the deep-water area of the Qiongdongnan Basin of China were systematically reviewed,the orderly symbiosis mechanisms and hydrocarbon accumulation processes of diverse gas reservoirs were analyzed,and a composite whole petroleum system model for the deep-water strongly active basins in the northern South China Sea was constructed.In the deep-water area of the Qiongdongnan Basin,there are three sets of source rocks,namely the Eocene,the Oligocene,and the upper Miocene-Quaternary,and three whole petroleum systems can be accordingly classified.The source rocks have the characteristics of multilayers,multiple types,and multiple hydrocarbon generation centers.The Eocene lacustrine source rocks,Oligocene marine and continental dual-origin source rocks,and upper Miocene-Quaternary marine source rocks form multiple hydrocarbon generation centers,which are orderly distributed from east to west.The reservoirs are characterized by multiple geological ages,multiple rock types,and multiple hydrodynamic influences,and exist as a reservoir composite superposition pattern with basement buried hill-lower traction flow sandbody-upper gravity flow sandbody vertically in the deep-water area.Fluid activities within the basin are controlled by free dynamic fields,confined dynamic fields,and bound dynamic fields.The natural gas in the whole petroleum system presents an orderly distribution of shale gas(speculated)-tight gas-conventional gas-ultra-shallow gas-hydrate from bottom to top.The research results have verified the adaptability of the whole petroleum system theory in the deep-water area of the Qiongdongnan Basin,providing a theoretical support for the exploration of complex oil and gas resources in the deep-water area,and are expected to effectively guide the distribution prediction and exploration of different types of petroleum resources in deep-water areas. 展开更多
关键词 Qiongdongnan Basin deep-water area composite whole petroleum system shallow gas hydrate orderly distribution of natural gas oil and gas reservoir sequence accumulation model
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Natural gas geological characteristics and great discovery of large gas fields in deep-water area of the western South China Sea 认领 引用 被引量：2
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作者 Wang Zhenfeng Sun Zhipeng +2 位作者 Zhu Jitian Guo Minggang Jiang Rufeng 《Natural Gas Industry B》 2015年第6期489-498,共10页
To accelerate the petroleum exploration in deep sea of China,since the period of“the 11th Five-Year Plan”,the sedimentary process,source rock formation and hydrocarbon generation and expulsion process in deep-water ... To accelerate the petroleum exploration in deep sea of China,since the period of“the 11th Five-Year Plan”,the sedimentary process,source rock formation and hydrocarbon generation and expulsion process in deep-water area of the Qiongdongnan Basin in the western South China Sea have been studied systematically using the data like large-area 3D seismic survey,logging,drill core(cuttings)and geochemical analysis,providing three innovative understandings,i.e.excellent hydrocarbon source conditions,good accumulation conditions,and grouping and zonal distribution of large exploration targets.From the study,the following conclusions are drawn.First,the deep-water area located in the southern and central parts of the Qiongdongnan Basin was formed under the control of such tectonic events as IndosinianeEurasian Plate collision,Himalayan uplifting and South China Sea expansion,and experienced Paleogene lift and Neogene depression stages.Second,accompanied by lacustrine deposition,faulting activity was violent in Eocene;whereas in Early Oligocene,rift continued to develop under a sedimentary environment of marineeterrestrial transitional facies and littoral-neritic facies.Third,oil generation predominated Eocene lacustrine mudstone and gas generation predominated Lower Oligocene marineeterrestrial transitional facies coal-measure strata compose two sets of major source rocks.Fourth,analysis in respect of thermal evolution level,hydrocarbon generation volume and hydrocarbon generation intensity shows that Ledong,Lingshui,Baodao and Changchang sags belong to potential hydrocarbon-rich kitchens,among which Ledong and Lingshui sags have been proved to have great hydrocarbon generation potential by drilling.Fifth,researches of deep-water sedimentology and hydrocarbon accumulation dynamics reveal that Paleogene and Neogene plays are developed vertically,and favorable hydrocarbon accumulation zones like the Central Canyon lithologic trap zone(group),Changchang circum-sag trap zone(group)and southern Baodao fault terrace zone are developed horizontally in the area.Sixth,with its excellent petroleum accumulation conditions and great exploration potential,the Central Canyon lithologic trap zone should be taken as the preferred drilling target,which has been verified correct by the discovery of the Central Canyon Gas Field d the largest gas field in the northern South China Sea. 展开更多
关键词 Western South China Sea Qiongdongnan Basin Deep-water Natural gas Large gas field Submarine canyon Play Exploration area
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Integrating wind field analysis in UAV path planning:Enhancing safety and energy efficiency for urban logistics 认领 引用 被引量：3
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作者 Ruijia GU Yifei ZHAO Xinhui REN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第1期508-533,共26页
Shenzhen,a major city in southern China,has experienced rapid advancements in Unmanned Aerial Vehicle(UAV)technology,resulting in extensive logistics networks with thousands of daily flights.However,frequent disruptio... Shenzhen,a major city in southern China,has experienced rapid advancements in Unmanned Aerial Vehicle(UAV)technology,resulting in extensive logistics networks with thousands of daily flights.However,frequent disruptions due to its subtropical monsoon climate,including typhoons and gusty winds,present ongoing challenges.Despite the growing focus on operational costs and third-party risks,research on low-altitude urban wind fields remains scarce.This study addresses this gap by integrating wind field analysis into UAV path planning,introducing key innovations to the classical model.First,UAV wind resistance and turbulence constraints are analyzed,mapping high-wind-speed and turbulence-prone zones in the airspace.Second,wind dynamics are incorporated into path planning by considering airspeed and groundspeed variation,optimizing waypoint selection and flight speed adjustments to improve overall energy efficiency.Additionally,a wind-aware Theta*algorithm is proposed,leveraging wind vectors to expedite search process,while Computational Fluid Dynamics(CFD)techniques are employed to calculate wind fields.A case study of Shenzhen,examining wind patterns over the past decade,demonstrates a 6.23%improvement in groundspeed and a 7.69%reduction in energy consumption compared to wind-agnostic models.This framework advances UAV logistics by enhancing route safety and energy efficiency,contributing to more cost-effective operations. 展开更多
关键词 Drone logistics Energy consumption Hazardous field region Path planning Unmanned aerial vehicle(UAV) Urban wind fields
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Deep-water Natural Gas Differential Migration and Enrichment in East African Transform Continental Marginal Basins 认领 引用
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作者 CAI Jun HE Youbin +1 位作者 LIANG Jianshe GUO Rong 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2025年第4期1105-1118,共14页
Compared to discrete continental marginal basins,the mechanisms of hydrocarbon migration and enrichment in transform continental marginal basins are poorly understood.In this study,we conducted a comprehensive analysi... Compared to discrete continental marginal basins,the mechanisms of hydrocarbon migration and enrichment in transform continental marginal basins are poorly understood.In this study,we conducted a comprehensive analysis of the main source rocks,reservoirs,and vertical migration pathways within the Rovuma(RB)and Tanzania(TB)basins in East Africa utilizing drilling,logging,seismic,and geochemical data.The results indicate that the enhanced preservation conditions of the Lower Jurassic source rocks in the southwest could lead to the discovery of large natural gas fields in the southern TB and RB.The primary reservoir is a deep-water turbidite sandstone.Due to topographic differences,the expanse of the turbidite sandstones in the RB is significantly larger than those in Tanzania.The main vertical migration pathways are the western boundary fault zone of the Kerimbas Graben(WBFZ)and the Seagap fault zone(SFZ).In the RB,natural gas migrates vertically along the WBFZ and preferentially accumulates in the deep-water turbidite sandstones of the footwall under the control of the fluid potential.Conversely,in the southern TB,the deep natural gas first migrates upward along the SFZ,then moves along the shallow branch faults in the sandstones on both sides of the SFZ. 展开更多
关键词 upstream exploration natural gas differential enrichment transform continental marginal basin fault activity deep-water Mozambique-Tanzania
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An innovative multi-energy field-assisted ultra-precision machining technology:in-situ laser-magnetic dual-field assisted diamond cutting 认领 引用 被引量：1
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作者 Yintian Xing Yue Liu +8 位作者 Changlin Liu Yuhan Li Tengfei Yin Sen Yin Zhanwen Sun Zhiwei Zhu Changxi Xue Wai Sze Yip Suet To 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第2期710-741,共32页
Field-assisted diamond cutting technology is a significant machining method that utilizes external energy fields to enhance the manufacturing performance.However,aimed the emergence of advanced high-performance materi... Field-assisted diamond cutting technology is a significant machining method that utilizes external energy fields to enhance the manufacturing performance.However,aimed the emergence of advanced high-performance materials,traditional single-field-assisted machining struggles to meet stringent precision requirements.Therefore,this study introduces an innovative and unique multi-energy field-assisted ultra-precision machining technology,in-situ laser-magnetic dual-field assisted diamond cutting(LMDFDC),to transcend the limitations of conventional single-field-assisted cutting methods and advance the machinability of challenging materials,notably the multi-principal-element high-entropy alloy(HEA).To elucidate the fundamental science questions of“what occurs,what changes,and what improves”in this work,the phenomenological behaviors of the dual-field coupling interaction are systematically investigated through advanced characterization techniques,spanning macroscopic surface integrity to microscopic atomic arrangement.This comprehensive study encompasses integrated analyses of four machining techniques for HEA workpiece,namely dual-energy field,two single-energy fields,and no-energy field.The research results indicate that the dual-field coupling effect demonstrates a leap in manufacturing performance through thermo-magneto-mechanical multi-physical synergistic interactions,primarily manifested in improved surface quality,reduced subsurface damage,suppressed diamond tool wear,and enhanced material removal stability.The significance of in-situ LMDFDC technology resides in propelling frontier academic developments in multi-physics coupled manufacturing theories while uncovering innovative machining approaches for next-generation high-performance materials. 展开更多
关键词 multi-energy field-assisted machining technology ultraprecision diamond cutting technology laser field magnetic field high-entropy alloy
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Laser-optical-field-modulation fabricating large-aperture dual-band antireflection windows for MWIR and LWIR imaging 认领 引用 被引量：2
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作者 Yulong Ding Cong Wang +8 位作者 Xianshi Jia Linpeng Liu Zheng Gao Xiang Jiang Shiyu Wang Dejin Yan Nai Lin Zhou Li Ji’an Duan 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第2期560-574,共15页
Dual-band antireflection(DBAR)windows based on surface microstructures offer a promising solution for mid-wave infrared(MWIR)and long-wave infrared(LWIR)co-aperture composite imaging.However,micro-nano manufacturing t... Dual-band antireflection(DBAR)windows based on surface microstructures offer a promising solution for mid-wave infrared(MWIR)and long-wave infrared(LWIR)co-aperture composite imaging.However,micro-nano manufacturing technology faces significant challenges in efficiently producing highly uniform microstructures with characteristic dimensions of∼1μm across hundreds of millimeters.Here,we report a laser optical field modulation(LOFM)technology for the rapid manufacture of ultra-large-scale arrays of antireflection microholes(ARMHs)on large-aperture and non-perfectly planar windows.LOFM technology,which modulates laser pulses in both temporal and spatial domains,enhances ARMH aspect ratios from 0.1 to 0.8 without reducing manufacturing time,and maintains processing accuracy even with laser focus shifts,thereby addressing inconsistencies in large-area processing.As a proof of concept,approximately 7 billion ARMHs are fabricated on a 100-mm-diameter zinc sulfide(ZnS)window at a rate of 20000 holes per second using LOFM technology assisted by machine learning.The fabricated DBAR ZnS window exhibits ultra-broadband(3.5−14μm),high transmittance(91.1%),wide-angle transmission,wear-resistant,and self-cleaning,making it suitable for environments with multiple interference factors.Dual-band imaging applications demonstrate the significant advantages of DBAR windows in target recognition,multi-scenario robustness,and information acquisition. 展开更多
关键词 laser optical field modulation large-aperture window non-perfectly planar antireflection microstructure dual-band infrared imaging
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Response of wind turbine loads to multi-scale turbulent structures:a study based on turbulence signals observed in the field 认领 引用 被引量：2
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作者 Yongfen Chai Yan Wang +2 位作者 Haolin Li Jingjing Zhang Jian Zheng 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第2期593-609,共17页
Accurately assessing the impact of turbulence structures on load fluctuation is crucial for the long-term stable operation of wind turbines.Based on turbulence signals observed at the Qingtu Lake Observed Array in Chi... Accurately assessing the impact of turbulence structures on load fluctuation is crucial for the long-term stable operation of wind turbines.Based on turbulence signals observed at the Qingtu Lake Observed Array in China,the aerodynamic load responses of the wind turbine to different turbulence scales are quantitatively analyzed in this study.The results indicate that very large-scale motions(VLSMs)are associated with significant load fluctuations due to its low frequency and high energy characteristics,increasing the risk of extreme loads.Large-scale motions coupled with the natural frequency of wind turbines in the medium frequency range,result in resonance phenomena.Small-scale motions,due to their high-frequency rapid vibration characteristics,cause instantaneous oscillations in wind turbine loads.Furthermore,correlation analysis indicates that the flapwise moment and thrust are most sensitive to VLSMs,while the edgewise moment is less affected by the scale characteristics.It is worth noting that this study is the first to explore the modulation effects of different scales of turbulent structures on the amplitude of wind turbine load fluctuation.It was found that turbulent structures exceeding a scale of 3δ have the most significant impact on modulating the load amplitudes,where δ is the boundary layer thickness,which is 99% of the flow velocity outside the boundary layer.These findings contribute to the enhancement of understanding regarding the load response of wind turbines in multi-scale turbulent environments and provide important references for the optimization of wind turbine design and load control. 展开更多
关键词 Multi-scale turbulent structures Wind turbine load response Field observation experiment Wavelet analyze
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Grain refinement and dendrite morphology of superalloy K4169 during equiaxed growth under pulsed magnetic field 认领 引用 被引量：1
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作者 Ce Zheng Yue-fei Teng +5 位作者 Fu-qiang Wang Ying-ju Li Tian-jiao Luo Xiao-hui Feng Cheng Zhu Yuan-sheng Yang 《China Foundry》 SCIE EI CAS CSCD 2026年第4期523-534,共12页
The grain refinement effect of superalloy K4169 under a low-voltage pulsed magnetic field(PMF)with different pulse frequencies and pulse voltages,at a superheat of 191℃,was investigated.The grains of the ingots are r... The grain refinement effect of superalloy K4169 under a low-voltage pulsed magnetic field(PMF)with different pulse frequencies and pulse voltages,at a superheat of 191℃,was investigated.The grains of the ingots are refined,decreasing from 3.9 mm without the application of PMF to 1.7 mm with PMF.Furthermore,the dendrite morphology undergoes a transformation,changing from well-developed branches to a global rosette pattern with rounded dendrite tips.However,it is worth noting that the secondary dendrite arm spacing increases under the influence of PMF.The refinement mechanism was investigated by quenching experiments and theoretical analysis under PMF.The high superheat of 191℃ results in a low cooling rate and a small thermal gradient during solidification,which promotes the survival of heterogeneous nuclei,leading to grain refinement.Additionally,evolutions in dendrite morphology are attributed to increased heterogeneous nucleation.When PMF is applied,the solidification structure is refined even under high superheat conditions.This leads to simultaneous improvements in filling ability and grain size refinement,offering promising applications for the practical manufacturing of thin-walled complex parts. 展开更多
关键词 Ni-based superalloy pulsed magnetic field grain refinement dendrite morphology solidification
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Evaluation and application of an innovative portable field endoscope:addressing battlefield and biosafety concerns 认领 引用 被引量：1
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作者 Gang Sun Jia-Qi Zeng +11 位作者 Jun-Ling Wu Shu-Fang Wang Li-Hua Peng Bin Yan Fei Pan Yi Li Guan-Zhou Zhou Xiao-Dong Chen Zi-Kai Wang Xiang-Dong Wang Wan-Yuan Lian Yun-Sheng Yang 《Military Medical Research》 SCIE CAS CSCD 2026年第3期353-364,共12页
Background:At present,no commercially available endoscopic system is specifically designed for use in the battlefield,disaster relief,or unique environments with biosafety concerns.Therefore,this limitation stems from... Background:At present,no commercially available endoscopic system is specifically designed for use in the battlefield,disaster relief,or unique environments with biosafety concerns.Therefore,this limitation stems from challenges such as limited portability,reliance on stable power,complex disinfection processes,and the risk of incomplete sterilization.To address these challenges,we developed a novel portable endoscopic system and evaluated its safety and effectiveness in both routine settings and specialized scenarios,including the global pandemic caused by a novel coronavirus,which represents an environment with biosafety concerns.Methods:After sample size calculation,30 patients underwent esophagogastroduodenoscopy(EGD)or colonoscopy using the YunSendo(the experimental group)and Olympus systems(the control group)in a randomized order.Operation time,image quality,operational performance,lesion detection,and safety were assessed.Ten emergency patients with suspected upper gastrointestinal bleeding received bedside treatment using the YunSendo system during the global pandemic caused by a novel coronavirus.Clinical outcomes in emergency endoscopic treatment were assessed.Results:No significant differences were observed between the YunSendo and Olympus groups in terms of image quality,lesion detection,and overall procedural performance.YunSendo facilitated biopsy and colonic polyp removal;no adverse endoscopy events were reported.YunSendo successfully executed diagnostic and therapeutic procedures in emergencies,with no observed mortality at 1,7,or 30 d,no rebleeding at 1 or 30 d,and no cross-infection rates.Conclusions:The performance of the YunSendo portable endoscopic system was comparable to the Olympus system in terms of key metrics,demonstrating its utility in urgent scenarios.This novel system is particularly promising for medical rescue and military missions and for addressing battlefield and biosafety concerns. 展开更多
关键词 Portable gastrointestinal endoscopy Gastrointestinal bleeding Colonoscopy Endoscopic procedures Field endoscopy
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Optimization of multi-cluster fracturing in deep reservoirs based on stress field reconstruction effect 认领 引用 被引量：1
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作者 Jinbo Li Siwei Meng +3 位作者 He Liu Suling Wang Kangxing Dong Qiuyu Lu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第3期227-245,共19页
Since rock plasticity under in-situ conditions poses challenges during fracturing stimulation,extensive research is necessary on deep gas and oil reserves,which will be the primary area of future development.This pape... Since rock plasticity under in-situ conditions poses challenges during fracturing stimulation,extensive research is necessary on deep gas and oil reserves,which will be the primary area of future development.This paper created a competitive,multi-cluster fracture propagation model that considered elastoplastic rock deformation and nonlinear fracture characteristics in deep reservoirs.It also proposed an optimal fracture design of“dense fracture distribution,non-uniform perforation and alternating staged fracturing”based on stress field reconstruction.The findings indicated that suitably reducing the spacing between clusters and increasing the number of perforated clusters minimized local in-situ stress variations through stress interference among fractures.This mitigated the limiting effect of plastic deformation on the propagation of hydraulic fractures,demonstrating a viable approach for enhancing the expansion of fractures in deep reservoirs.The elastoplastic fracture propagation mechanism was examined to elucidate the advantages of close-cutting fracturing technology.The impact of various fracture techniques was analyzed using stress field reconstruction.Alternate fracturing displayed a high degree of stress reconstruction with an extensive propagation range,which facilitated the propagation of multiple fracture clusters in the subsequent fracturing section.The findings offer a theoretical basis for fracture design of deep reservoirs. 展开更多
关键词 Deep reservoir Stress field reconstruction Stage multi-cluster fracturing Elastoplastic crack Competitive propagation
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Cooperative Sensing for 6G ISAC:Concept,Key Technologies,Performance Evaluation,and Field Trial 认领 引用 被引量：1
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作者 Guangyi Liu Lincong Han +7 位作者 Rongyan Xi Liang Ma Zixiang Han Yahui Xue Hanting Zhao Jing Jin Qixing Wang Fei Xu 《Engineering》 SCIE EI CSCD 2026年第1期130-148,共19页
Cooperative integrated sensing and communication(ISAC),an advanced version of ISAC,is becoming an inevitable paradigm in sixth-generation mobile information networks.Based on the foundation of largescale deployed mobi... Cooperative integrated sensing and communication(ISAC),an advanced version of ISAC,is becoming an inevitable paradigm in sixth-generation mobile information networks.Based on the foundation of largescale deployed mobile networks,cooperative ISAC holds promise to realize ubiquitous sensing,thus becoming a significant step in promoting the transformation from connected things to connected intelligence.In this paper,we depict a sweeping panorama of cooperative ISAC,including the concept,key technologies,a performance evaluation framework,and field trials.We start by introducing the application scenarios of cooperative ISAC,which are the motivation for its commercialization.Next,from the perspective of technical development,we trace the evolution of cooperative ISAC,noting that cooperation within sensing and communication is an objective trend.We reveal the four core features of cooperative ISAC-denoted herein as network-enabled,integration,cooperation,and everything-and provide a general system model.Regarding key technologies,we introduce our contributions to antenna array design,cooperative clustering,synchronization,and data fusion,as well as interference management and networking.We also propose an evaluation framework and define several key performance indicators for cooperative ISAC.Through system-level simulations and field trials,we show the practical application feasibility of cooperative ISAC.Finally,we provide guidance on future research directions in cooperative ISAC. 展开更多
关键词 Sixth generation Integrated sensing and communication Cooperative sensing Synchronization Data fusion Field trial
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Higher-order topological states and magnetic field control in elastic metamaterials 认领 引用 被引量：1
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作者 Yuqi Tang Weijian Zhou +3 位作者 Yangwei Mai Yingjie Chen Zheng Zhong Weiqiu Chen 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第3期138-145,共8页
Recently,the concept of higher-order topological insulators has aroused widespread attention and research interest.However,current studies have predominantly focused on the domain of acoustic waves.Compared to acousti... Recently,the concept of higher-order topological insulators has aroused widespread attention and research interest.However,current studies have predominantly focused on the domain of acoustic waves.Compared to acoustic waves,elastic waves are vector waves,making their study more complex and challenging.Therefore,achieving higher-order topological states in elastic waves holds significant research value.In this paper,we proposed the design of an intelligent topological metamaterial,which is composed of magneto-rheological thin layers and an elastic substrate.First,by adjusting the topological structure,we successfully excited first-order topological states of Lamb waves in numerical simulations.Subsequently,we constructed a two-dimensional topological structure to excite zero-order topological corner states.Given the unique advantages of magnetic fields in regulating material properties and behaviors,we investigated the effects of magnetic fields as an external control mechanism on Lamb waves in magneto-rheological materials.Our analysis focused on the regulation of Lamb wave topological edge states and corner states via magnetic fields.The results demonstrate that by varying the magnetic field strength,we can precisely control the characteristics of the topological states.Magnetic field modulation of the topological states in Lamb waves enables the realization of non-contact,controllable phononic devices,which is of great significance for the development of topological acoustics. 展开更多
关键词 Lamb waves Topological insulators Topological edge states Topological corner states Magnetic field modulation
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The War for Fertile Soil:Advancements in Soil Nutrient Field Sensors 认领 引用 被引量：1
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作者 Daming Dong Ning Wang +2 位作者 Hongwu Tian Shixiang Ma Chunjiang Zhao 《Engineering》 SCIE EI CSCD 2026年第5期7-10,共4页
1.Introduction Soil is the foundation of agriculture and of life itself[1],and fertile soil gives birth to crops with rich nutrients.Crops have significant species-specific demands for soil nutrients,including nitroge... 1.Introduction Soil is the foundation of agriculture and of life itself[1],and fertile soil gives birth to crops with rich nutrients.Crops have significant species-specific demands for soil nutrients,including nitrogen(N),phosphorus(P),potassium(K),trace elements,and so forth.Differences in crop nutrient needs are mainly due to the physiological characteristics of the development of different organs and the diversity of metabolic pathways.For example,leafy crops(spinach,lettuce,etc.)require more N for stem and leaf growth,while fruit crops(tomatoes,peppers,soybeans,etc.)rely on more P and K to facilitate the formation of organs such as seeds and fruits.Cereal crops(corn,wheat,etc.)have a prominent demand for N and silicon(Si),which are used for protein synthesis and to increase stem strength,while fruit trees are sensitive to trace elements such as calcium(Ca)and magnesium(Mg),which are used to stabilize cell walls and promote photosynthesis. 展开更多
关键词 soil nutrients field sensors physiological characteristics crop nutrient needs fruit crops cereal crops soil nutrientsincluding metabolic pathways
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Combined electric field treatment with copper and silver for water disinfection 认领 引用 被引量：1
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作者 Mourin Jarin Xing Xie 《ENGINEERING Environment》 SCIE EI CAS CSCD 2026年第3期1-16,共16页
Domestic water is of great importance to our modern lives and yet opportunistic pathogens like Legionella,Cryptosporidium,and Giardia are the largest cause of outbreaks and illnesses in our potable water supply.Previo... Domestic water is of great importance to our modern lives and yet opportunistic pathogens like Legionella,Cryptosporidium,and Giardia are the largest cause of outbreaks and illnesses in our potable water supply.Previously,electric field treatment(EFT)in combination with copper(Cu)was studied at the microscale and found to have synergistic performance enhancing the inactivation of bacteria.In this study,a lab-on-a-chip device is used to better understand,observe,and quantify the synergistic effect when combining EFT with Cu and Ag for water disinfection.Staphylococcus epidermidis is studied as a model bacterium.Using Cu and/or Ag ions with various concentrations as the chemical disinfection agents and EFT as the physical disinfection aid,we can ultimately reduce the metal ion concentration and energy required to achieve effective inactivation of bacteria.In this study,the highest synergies were measured using EFT with Cu and Ag together,for example,achieving>95% inactivation using only 34 kV/cm electric field strength,200μg/L Cu,and 10μg/L Ag.These results can be used to optimize and customize the disinfection performance of EFT devices to adapt for its various point-of-use applications. 展开更多
关键词 Copper/silver Electric field treatment Electroporation Bacteria inactivation LOAC
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Innovative strategies and perspectives for enhancing photoelectrochemical water splitting:Physical field engineering 认领 引用
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作者 Wenfeng Li Guocheng Lv +6 位作者 Meng Liu Fanyue Zhao Zetian He Guihong Li Wenping Wang Libing Liao Daimei Chen 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2026年第2期9-36,共28页
Photoelectrochemical(PEC)water splitting efficiently produces chemical fuels,yet persistent efficiency bottlenecks impede widespread deployment despite documented advances.In recent years,the introduction of external ... Photoelectrochemical(PEC)water splitting efficiently produces chemical fuels,yet persistent efficiency bottlenecks impede widespread deployment despite documented advances.In recent years,the introduction of external physical fields has emerged as a promising technique to remarkably improve the PEC performances of semiconductors both internally and externally.This review presents an in-depth exploration of the mechanisms underlying the utilization of thermal field(photothermal,pyroelectric effect),piezoelectric field(strain piezoelectricity,ferroelectric polarization),magnetic field(negative magnetoresistive effect,lorentz forces,spin polarization),and coupled fields in enhancing the synergistic effects of PEC water splitting,and subsequently analyzes their influence on the performance of PEC systems.It particularly emphasizes the underlying mechanisms that facilitate the strengthening of external fields on the excitation,transfer,and separation of carriers,as well as the enhancement of surface reactions.Additionally,we delve into the expansive prospects of externally assisted PEC water splitting,examining both its fundamental research implications and practical applications.Finally,we discuss the challenges encountered in its development and offer insights into potential future directions. 展开更多
关键词 Photoelectrochemical water splitting Thermal field Magnetic field Piezoelectric field Multiphysics field
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Full-space inverse-designed meta-optics for complex vector field shaping of intracavity landscapes 认领 引用
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作者 Mingfeng Xu Di Sang +11 位作者 Mingbo Pu Ping Gao Bowen Zhao Yuhan Zheng Qingji Zeng Lianwei Chen Fei Zhang Yinghui Guo Xiong Li Xiaoliang Ma Yunqi Fu Xiangang Luo 《Light: Science & Applications》 SCIE EI CAS CSCD 2026年第6期2067-2077,共11页
The sophisticated shaping of electromagnetic field landscapes,both outside and inside optical cavities,has long been an important goal of optics and photonics,with broad applications in near-field imaging,lithography,... The sophisticated shaping of electromagnetic field landscapes,both outside and inside optical cavities,has long been an important goal of optics and photonics,with broad applications in near-field imaging,lithography,and laser science.Despite extensive progress in far-field shaping of extracavity landscapes,achieving accurate tailoring of three-dimensional intracavity fields has remained elusive.Here,we propose full-space adjoint-enabled freeform meta-optics for complex,on-demand vector field shaping of intracavity landscapes.In contrast with conventional semi-space adjoint approaches,the full-space adjoint strategy allows for efficient full-wave optimization of vector fields at the subwavelength scale,overcoming strong multiple scattering and interference intrinsic to enclosed cavity boundaries.We experimentally demonstrate tailored plasmonic cavity landscapes with a freeform metasurface mask,realizing a fivefold enhancement in imaging fidelity without sacrifiicing optical super-resolution performance.Our work significantly broadens the scope of freeform meta-optics and may open new avenues for applications in nanophotonics,topological photonics,and quantum optics. 展开更多
关键词 field shaping optics photonicswith intracavity landscapes full space inverse designed meta optics electromagnetic field landscapes near field imaging shaping electromagnetic field landscapesboth accurate tailoring
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Transition signatures for electron-positron pair creation in space-time inhomogeneous electric field 认领 引用
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作者 Chuan-Ke Li Xian-Xian Zhou +4 位作者 Qiang Chen Bang An Ying-Jun Li Nan-Sheng Lin Yang Wan 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第5期406-413,共8页
The process of electron-positron pair creation through multi-photon absorption in a space-time dependent electric field is analyzed using computational quantum field theory.Our findings reveal two distinct pair creati... The process of electron-positron pair creation through multi-photon absorption in a space-time dependent electric field is analyzed using computational quantum field theory.Our findings reveal two distinct pair creation channels:the symmetric and asymmetric transition channels.We propose that the asymmetric transition channel arises from the inherent spatial inhomogeneity of intense laser pulses.By mapping the field-theoretical model of laser-assisted multi-photon pair creation onto a quantum-mechanical time-dependent framework,a semi-analytical solution that captures the asymmetric transition signatures of vacuum decay is derived.Additionally,it is demonstrated that neglecting spatial inhomogeneity leads to erroneous transition amplitudes and incorrect identification of pair creation channels.Furthermore,we have established that asymmetric transition channels substantially enhance the creation of electron-positron pairs for a given laser pulse energy. 展开更多
关键词 electron–positron pair creation ultra-strong laser field computational quantum field theory
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Sedimentary build-ups of pre-salt isolated carbonate platforms and formation of deep-water giant oil fields in Santos Basin,Brazil 认领 引用 被引量：5
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作者 DOU Lirong WEN Zhixin +7 位作者 WANG Zhaoming HE Zhengjun SONG Chengpeng CHEN Ruiyin YANG Xiaofa LIU Xiaobing LIU Zuodong CHEN Yanyan 《Petroleum Exploration and Development》 SCIE 2024年第4期949-962,共14页
In response to the problems of unclear distribution of deep-water pre-salt carbonate reservoirs and formation conditions of large oil fields in the Santos passive continental margin basin,based on comprehensive utiliz... In response to the problems of unclear distribution of deep-water pre-salt carbonate reservoirs and formation conditions of large oil fields in the Santos passive continental margin basin,based on comprehensive utilization of geological,seismic,and core data,and reconstruction of Early Cretaceous prototype basin and lithofacies paleogeography,it is proposed for the first time that the construction of pre-salt carbonate build-ups was controlled by two types of isolated platforms:inter-depression fault-uplift and intra-depression fault-high.The inter-depression fault-uplift isolated platforms are distributed on the present-day pre-salt uplifted zones between depressions,and are built on half-and fault-horst blocks that were inherited and developed in the early intra-continental and inter-continental rift stages.The late intra-continental rift coquinas of the ITP Formation and the early inter-continental rift microbial limestones of the BVE Formation are continuously constructed;intra-depression fault-high isolated platforms are distributed in the current pre-salt depression zones,built on the uplifted zones formed by volcanic rock build-ups in the early prototype stage of intra-continental rifts,and only the BVE microbial limestones are developed.Both types of limestones formed into mound-shoal bodies,that have the characteristics of large reservoir thickness and good physical properties.Based on the dissection of large pre-salt oil fields discovered in the Santos Basin,it has been found that both types of platforms could form large-scale combined structural-stratigraphic traps,surrounded by high-quality lacustrine and lagoon source rocks at the periphery,and efficiently sealed by thick high-quality evaporite rocks above,forming the optimal combination of source,reservoir and cap in the form of“lower generation,middle storage,and upper cap”,with a high degree of oil and gas enrichment.It has been found that the large oil fields are all bottom water massive oil fields with a unified pressure system,and they are all filled to the spill-point.The future exploration is recommended to focus on the inter-depression fault-uplift isolated platforms in the western uplift zone and the southern section of eastern uplift zones,as well as intra-depression fault-high isolated platforms in the central depression zone.The result not only provides an important basis for the advanced selection of potential play fairways,bidding of new blocks,and deployment of awarded exploration blocks in the Santos Basin,but also provides a reference for the global selection of deep-water exploration blocks in passive continental margin basins. 展开更多
关键词 Santos Basin passive continental marginal basin deep water inter-depression fault-uplift isolated carbonate platform intra-depression fault-high carbonate isolated platform giant oil fields
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Revision Scheme of Atmospheric Electric Field Measurements Considering the Corona Effect 认领 引用
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作者 GUO Xiu-feng WANG Zhao-xia +9 位作者 FENG Jian-wei SHAN Yong-tao ZHANG He ZHANG Ling ZHAO Nian GAO Yue ZHAO Yu-bin ZHENG Yu-hang HUANG Ke-yang GUAN Peng-qi 《Journal of Tropical Meteorology》 SCIE CAS CSCD 2026年第3期302-314,共13页
Research on atmospheric electric field distortion factors is crucial for enhancing the accuracy of lightning monitoring and warnings.In this study,two mill installation cases were established.Based on an established t... Research on atmospheric electric field distortion factors is crucial for enhancing the accuracy of lightning monitoring and warnings.In this study,two mill installation cases were established.Based on an established threedimensional corona discharge model,the impact of corona discharge of the lightning rod on the ground atmospheric electric field(E)was investigated by comparing two situations,with and without corona,while considering the influence of wind.In the absence of wind,State 1 represented the condition with corona,whereas State 2 represented the condition without corona.In State 1,the measurement results of E were not affected by the rod.Conversely,in State 2,the corona discharge of the rod caused a distortion of E;the lower the height of the rod,the higher the degree of distortion caused by the corona on E.When wind was considered,the position of the mill affected the distortion of E.The distortion coefficient was ki(i=3,4,5)and ki<1.Specifically,k3 was the distortion coefficient when the mill was installed in the windward area,k4 when it was installed in the leeward area,and k5 when it was installed in the sidewind area.The smaller ki,the greater the shielding effect.The highest shielding effect was exhibited by exhibited,followed by k5 and k4.The leeward installation yielded the greatest shielding effect,whereas the windward installation offered the lowest shielding effect.When the same case was considered,the greater the wind speed,the more the corona charge of the tip was released,and the stronger the shielding effect on E.When two different cases were adopted,the relationship between the wind speed(v)and the revision coefficient(p)was fitted.The values of p and v exhibited an exponential functional relationship. 展开更多
关键词 atmospheric electric field independent lightning rod electric field distortion corona discharge revision coefficient
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