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金沙江上游SBAS-InSAR滑坡三维形变监测与堵江影响分析 认领 引用 被引量：1
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作者 蒋亚楠 许强 +2 位作者 汤明高 朱星 张超 《地球科学》 EI CAS CSCD 北大核心 2026年第4期1189-1199,共11页
利用SBAS-InSAR技术处理了2014—2022年间Sentinel-1A升降轨SAR数据,重点研究了白格滑坡堵江事件对其下游最近临滑坡群活动性的影响.选择受堵江影响显著的沙东滑坡进行了地形约束下的InSAR三维形变反演,并结合GNSS监测验证模型性能.研... 利用SBAS-InSAR技术处理了2014—2022年间Sentinel-1A升降轨SAR数据,重点研究了白格滑坡堵江事件对其下游最近临滑坡群活动性的影响.选择受堵江影响显著的沙东滑坡进行了地形约束下的InSAR三维形变反演,并结合GNSS监测验证模型性能.研究结果显示,白格滑坡堵江后,沿岸滑坡的形变速率普遍增加了3~7倍不等.特别是位于金沙江凹岸的沙东滑坡,单体受影响面积约1.85 km2,最快变形速率增加了堵江前的7倍.三维形变结果表明,相较于地表平行流(SurfaceParallel Flow,SPF)模型,坡向平行流(Aspect Parallel Flow,APF)地形约束模型在沙东滑坡三维形变反演中的表现更优. 展开更多
关键词 SBAS-InSAR 三维形变 白格滑坡 堵江影响 工程地质学
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黔西输电廊道Sentinel-1A可视性与升降轨SBAS-InSAR滑坡识别研究 认领 引用 被引量：1
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作者 张元胤 杨紫霄 +5 位作者 魏朝志 贾健 路颜嘉 刘彪 周腾 陈家和 《中国地质灾害与防治学报》 CSCD 2026年第1期88-99,共12页
西电东送是保障我国电力安全和资源优化的重大工程,也是输电廊道中滑坡、崩塌灾害最突出的廊道之一。InSAR技术适于广域滑坡识别,但山区受SAR影像几何畸变影响易出现漏判错判,需进行可视性分析以确保滑坡识别的可靠性。文章基于开放获... 西电东送是保障我国电力安全和资源优化的重大工程,也是输电廊道中滑坡、崩塌灾害最突出的廊道之一。InSAR技术适于广域滑坡识别,但山区受SAR影像几何畸变影响易出现漏判错判,需进行可视性分析以确保滑坡识别的可靠性。文章基于开放获取的哨兵(Sentinel-1A)升降轨数据,采用真实入射角对研究区进行SAR可视性定量分析,同时结合SBAS-InSAR形变结果和现场调查结果判识黔西输电廊道的潜在滑坡。研究结果表明:升、降轨影像的入射角由近端至远端逐渐增大,增量分别为11.5°和12.2°,对可视性分析影响较大。当中山地貌的坡度小于入射角占比为90.5%时,升、降轨单轨观测几何畸变区(叠掩、阴影和透视收缩)的占比分别为46.8%和51.2%,而采用升降轨联合观测的几何畸变较前者显著降低至6.1%,透视收缩区可视性得到极大改善。通过LOS形变和现场调查判别出潜在滑坡和崩塌2处。文章提出的入射角平距算法与像素列算法结果相近,最大偏差仅3.3%;根据形变速率图和剖面累计形变曲线划分崩塌区和堆积区,可为深入分析潜在滑坡提供技术支持。 展开更多
关键词 几何畸变 SBAS-InSAR 入射角 InSAR升降轨 滑坡识别
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结合SBAS-InSAR与IPSO-CNN-LSTM优化模型的尾矿库监测与预测研究 认领 引用 被引量：1
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作者 袁利伟 张舒寒 +2 位作者 李延林 杨四美 聂晗 《安全与环境学报》 CAS CSCD 北大核心 2026年第3期980-991,共12页
针对传统尾矿库监测手段的局限性及预测模型处理长时序数据时易丢失信息的问题,融合短基线集干涉合成孔径雷达(Small Baseline Subset Interferometric Synthetic Aperture Radar,SBAS-InSAR)与改进粒子群算法(Improved Particle Swarm ... 针对传统尾矿库监测手段的局限性及预测模型处理长时序数据时易丢失信息的问题,融合短基线集干涉合成孔径雷达(Small Baseline Subset Interferometric Synthetic Aperture Radar,SBAS-InSAR)与改进粒子群算法(Improved Particle Swarm Optimization,IPSO)优化卷积神经网络(Convolutional Neural Network,CNN)-长短期记忆(Long Short-Term Memory,LSTM)网络,构建监测预测模型。以云南某铅锌矿尾矿库为例,基于97景哨兵一号影像和SBAS-InSAR技术监测地表形变,结合GNSS数据验证。结果表明:垂向最大沉降形变速率为58.56 mm/a,累计最大沉降量为233.76 mm;并运用经验模态分解(Empirical Mode Decomposition,EMD)揭示了降雨与沉降的关联。研究表明:IPSO-CNN-LSTM模型的各项误差评价指标均显著低于单一模型及CNN-LSTM模型,且其决定系数均高于97%;IPSO-CNN-LSTM模型在预测尾矿库形变方面展现出更高的精度和稳定性,并能准确捕捉降雨波动性和趋势性的影响,为尾矿库的后续监测与管理提供了坚实的技术支撑。 展开更多
关键词 安全工程 尾矿库 SBAS-InSAR技术 IPSO-CNN-LSTM预测模型 形变监测 形变预测
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Broadband ground motion simulation and analysis of a near-fault 3D basin-mountain coupling site based on the hybrid method 认领 引用 被引量：1
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作者 Liu Zhongxian Tang Kang +2 位作者 Li Chengcheng Yuan Xiaoming Zhang Hai 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2026年第1期87-110,共24页
This study presents an effective hybrid simulation approach for simulating broadband ground motion in complex near-fault locations.The approach utilizes a deterministic approach based on the spectral element method(SE... This study presents an effective hybrid simulation approach for simulating broadband ground motion in complex near-fault locations.The approach utilizes a deterministic approach based on the spectral element method(SEM),which is used to simulate low-frequency ground motion(f1 Hz).A fourth-order Butterworth filter with zero phase shift is employed for time-domain filtering of low-and high-frequency time series at a crossover frequency of 1 Hz,merging the low and high-frequency ground motions into a broadband time series.Taking an Ms 6.8 Luding earthquake,as an example,this hybrid method was used for a rapid and efficient simulation analysis of broadband ground motion in the region.The accuracy and efficiency of this hybrid method were verified through comparisons with actually observed station data and empirical attenuation curves.Deterministic method simulation results revealed the effects of mountainous topography,basin effects,nonlinear effects within the basin’s sedimentary layers,and a coupling interaction between the basin and the mountains.The findings are consistent with similar studies,showing that near-fault sedimentary basins significantly focus and amplify strong ground motion,and the soil’s nonlinear behavior in the basin influences ground motion to varying extents at different distances from the fault.The mountainous topography impacts the basin’s response to ground motion,leading to barrier effects.This research provides a scientific foundation for seismic zoning,urban planning,and seismic design in nearfault mountain basin regions. 展开更多
关键词 hybrid ground motion simulation method spectral element method three-dimensional stochastic finite fault method near-fault basin-mountain coupling effect basin effect nonlinear effect
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Methods of preparation,structural characteristics of resistant starch and its relation to human health:a review 认领 引用 被引量：1
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作者 Weiyi Zhang Yang Yang +6 位作者 Chunmin Ma Bing Wang Xiaofei Liu Yan Wang Xin Bian Guang Zhang Na Zhang 《Food Science and Human Wellness》 SCIE CAS CSCD 2026年第4期1503-1519,共17页
Resistant starch(RS)comprises starch fractions that resist digestion in the small intestine and reach the colon,where they are fermented by the microbiota.Resistant starch harbors functional properties and healthpromo... Resistant starch(RS)comprises starch fractions that resist digestion in the small intestine and reach the colon,where they are fermented by the microbiota.Resistant starch harbors functional properties and healthpromoting ingredients that can regulate blood glucose and lipid levels,prevent cancer,and enhance the quality of life.Consequently,new technologies for the preparation of RS are continually being developed to support its industrial production.This review describes the structural and nutritional properties of RS and examines recent advancements in RS preparation methods.Emphasis is placed on how RS structure influences its properties and the physiological mechanisms in vivo.This review aims to stimulate further research into the preparation methods,functional characteristics,and utilization of RS,thereby supporting ongoing developments in the food industry. 展开更多
关键词 Resistant starch Preparation methods Characterization Function Human health
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基于PS-InSAR和SBAS-InSAR技术的山地光伏场站地表变形监测 认领 引用 被引量：1
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作者 赵东雷 吴绍华 +3 位作者 伍思睿 胡伟 李依玲 李麟玮 《贵州大学学报（自然科学版）》 2026年第2期105-115,共11页
如何实现高精度、持续性的场站地表变形监测已成为保障山地光伏场站安全运行的关键。本研究通过联合运用PS-InSAR与SBAS-InSAR技术,对贵州黔南地区两处典型山地光伏场站在2021—2025年期间的地表形变进行了监测。结果表明,PS-InSAR与SBA... 如何实现高精度、持续性的场站地表变形监测已成为保障山地光伏场站安全运行的关键。本研究通过联合运用PS-InSAR与SBAS-InSAR技术,对贵州黔南地区两处典型山地光伏场站在2021—2025年期间的地表形变进行了监测。结果表明,PS-InSAR与SBAS-InSAR技术在两处典型山地光伏场站宏观形变监测结果上具有高度一致性,且在空间细节捕捉方面呈现互补优势,验证了监测结果的可靠性。基于PS-InSAR与SBAS-InSAR技术的监测结果揭示了两个场站迥异的地表形变模式,即典型研究区Ⅰ表现为继承性发展的“北抬升南沉降”格局,沉降范围持续向北扩展,而典型研究区Ⅱ则呈现动态演化特征,形变中心由初期的中西部沉降转变为后期的“北沉降南抬升”格局。研究结果为山地光伏场站的稳定性评价与风险精准管控提供了一定的技术参考。 展开更多
关键词 山地光伏场站 地表形变监测 PS-InSAR SBAS-InSAR
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Development of nontarget method based on GC-QTOF-HRMS for analyzing organic pollutants in human serum 认领 引用 被引量：1
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作者 Congcong Yue Chang He +5 位作者 Hailing Li Zhiquan Yuan Guiying Li Shengtao Ma Xin Zhang Taicheng An 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第7期379-386,共8页
Traditional targeted analyses often overlook unknown or emerging contaminants,highlighting the significance of nontarget and suspect screening approaches.A novel and high-sensitivity methodology for nontarget analysis... Traditional targeted analyses often overlook unknown or emerging contaminants,highlighting the significance of nontarget and suspect screening approaches.A novel and high-sensitivity methodology for nontarget analysis of organic pollutants in human serum was newly-developed based on gas chromatography coupled with quadrupole time-of-flight high-resolution mass spectrometry.The extraction protocol employing an acetonitrile-ethyl acetate(9:1,V:V)mixture significantly improved the extraction efficiency while minimizing matrix effect.A hybridized analytical strategy integrating nontarget and suspect screening was developed to achieve comprehensive identification and classification of pollutants,employing the National Institute of Standards and Technology(NIST)20 library and Agilent Technologies Personal Compound Database and Library(PCDL).This approach successfully characterized 273 organic contaminants spanning 12 categories,including polycyclic aromatic hydrocarbons(PAHs)and their derivatives,esters,and phenolic compounds in human serum,with a significant increase in detection specificity compared to conventional workflows.The methodology used serum samples of the workers from coking industry,revealing widespread contamination dominated by PAHs and PAH derivatives.Among the target analytes,three were identified solely by NIST and six solely by PCDL,indicating the complementary benefits of combining these different databases.Notably,this work reported the first confirmed detection of 2-naphthalenamine in human serum.This optimized approach demonstrates enhanced sensitivity and reliability in serum analysis,advancing biomonitoring capabilities and providing a deep understanding of human exposure to environmental pollutants. 展开更多
关键词 Nontarget analysis Biomonitoring method Human serum sample Organic pollutants GC-QTOF-HRMS
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Implicit unified gas kinetic particle method for steady-state solution of multiscale phonon transport 认领 引用 被引量：2
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作者 Hongyu Liu Xiaojian Yang +2 位作者 Chuang Zhang Xing Ji Kun Xu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第2期496-510,共15页
This paper presents a highly efficient implicit unified gas-kinetic particle(IUGKP)method for obtaining steady-state solutions of multi-scale phonon transport.The method adapts and reinterprets the integral solution o... This paper presents a highly efficient implicit unified gas-kinetic particle(IUGKP)method for obtaining steady-state solutions of multi-scale phonon transport.The method adapts and reinterprets the integral solution of the Bhatnagar-Gross-Krook(BGK)equation for time-independent solutions.The distribution function at a given point is determined solely by the surrounding equilibrium states,where the corresponding macroscopic quantities are computed through a weighted sum of equilibrium distribution functions from neighboring spatial positions.From a particle perspective,changes in macroscopic quantities within a cell result from particle transport across cell interfaces.These particles are sampled according to the equilibrium state of their original cells,accounting for their mean free path as the traveling distance.The IUGKP method evolves the solution according to the physical relaxation time scale,achieving high efficiency in large Knudsen number regimes.To accelerate convergence for small Knudsen numbers,an inexact Newton iteration method is implemented,incorporating macroscopic equations for convergence acceleration in the near-diffusive limit.The method also addresses spatial-temporal inconsistency caused by relaxation time variations in physical space through the null-collision concept.Numerical tests demonstrate the method’s excellent performance in accelerating multi-scale phonon transport solutions,achieving speedups of one to two orders of magnitude.The IUGKP method proves to be an efficient and accurate computational tool for simulating multiscale non-equilibrium heat transfer,offering significant advantages over traditional methods in both numerical performance and physical applicability. 展开更多
关键词 Implicit gas kinetic particle method Phonon Boltzmann transport equation Multi-scale heat conduction Steady-state
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Prediction method for stationary crossflow instability transition in supersonic boundary layers based on multi-layer perceptron 认领 引用 被引量：2
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作者 Lei Qiao Xi Jiang +5 位作者 Jiakun Fan Yutian Wang Lu Xie Ningjuan Dong Jiakuan Xu Junqiang Bai 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第7期36-51,共16页
Crossflow vortices induced transition is one of the most important instability types in supersonic aircraft boundary layers.While the traditional linear stability theory(LST)-based eN method demonstrates satisfactory ... Crossflow vortices induced transition is one of the most important instability types in supersonic aircraft boundary layers.While the traditional linear stability theory(LST)-based eN method demonstrates satisfactory predictive capabilities for this kind of transition,its practical implementation faces inherent limitations:the requirement of first-and second-order wallnormal derivatives of boundary layer velocityemperature profiles,the need for initial eigenvalue guesses,and the computational burden of solving eigenvalue problems.To address these challenges,this study develops a multi-layer perceptron(MLP)model tailored for linear stability analysis of three-dimensional compressible boundary layers based on the artificially defined quasi-three-dimensional non-similar boundary layer solutions.The boundary layer edge flow parameters and perturbation characteristics are mapped to eigenvalues or local growth rates of the envelop curves through fully connected layers.This architecture eliminates the need for computing wall-normal derivatives of velocityemperature profiles,initial eigenvalue estimation,and direct eigenvalue problem solving.Extensive validation across varying operational conditions and geometries(airfoils and swept wings)demonstrates exceptional agreement between the MLP’s predictions(eigenvalues and disturbance amplification factors)and traditional LST results.Furthermore,the model’s transition prediction capability is rigorously verified using National Aeronautics and Space Administration’s supersonic swept-wing crossflow-dominated transition benchmark,incorporating both stability analysis and flight test data.Results confirm the model is an efficient and reliable computational framework for transition prediction in three-dimensional finite-span wings. 展开更多
关键词 Supersonic swept wing Boundary layer transition Crossflow instability Linear stability theory eN method Multi-layer perceptron
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Environmental Contour Methods for Long-Term Extreme Response Prediction of Offshore Wind Turbines 认领 引用 被引量：1
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作者 Jixiang Zhang Shan Wang +4 位作者 Milad Shadman Mojtaba Maali Amiri Baiqiao Chen Chen An Segen Farid Estefen 《哈尔滨工程大学学报（英文版）》 CSCD 2026年第2期473-490,共18页
The long-term responses of offshore wind turbines(OWTs)are critical in the design phase,where precise assessments ensure structural reliability and operational efficiency.The environmental contour method(ECM)enables e... The long-term responses of offshore wind turbines(OWTs)are critical in the design phase,where precise assessments ensure structural reliability and operational efficiency.The environmental contour method(ECM)enables efficient analysis of design responses by focusing on a selected set of critical environmental conditions that predominantly drive long-term extreme responses.Despite its extensive use in offshore engineering,ECM’s application in the structural design and strength assessment of OWTs remains underexplored.This study offers a comprehensive overview of the utilization of ECM in the context of OWT design,incorporating a bibliometric analysis of publications from the Web of Science to identify research trends and key topics.The analysis highlights diverse approaches for estimating long-term extreme responses and constructing environmental contours using statistical distributions.Additionally,the study explores the application of ECM and its modified versions in the design and strength assessment of OWTs.Challenges and opportunities associated with ECM implementation in OWTs are critically analyzed,providing insights into ECM’s potential for enhancing the efficiency and reliability of OWT structural design. 展开更多
关键词 Environmental contour method Offshore wind turbine Long-term extreme response Reliability
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Antibody screening for tumor and immune hotspot targets:The frontier of new methods and technologies 认领 引用 被引量：1
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作者 Yaping Zhou Yitan Zou +6 位作者 Shaodong Lv Dan Tan Guangyao Li Wenyan Fu Changhai Lei Mingdong Lu Shi Hu 《Journal of Pharmaceutical Analysis》 SCIE CAS CSCD 2026年第2期393-412,共20页
Advancements in tumor immunotherapy highlight the significant potential of antibody drugs,a key category of biological agents,for treating cancer and autoimmune diseases.This paper begins by defining and classifying k... Advancements in tumor immunotherapy highlight the significant potential of antibody drugs,a key category of biological agents,for treating cancer and autoimmune diseases.This paper begins by defining and classifying key targets in tumor immunity,as well as discussing their structural and functional characteristics.Subsequently,it elaborates on innovative technologies for antibody drug screening,which,when integrated with contemporary molecular biology,biotechnology,and computational biology,have substantially enhanced the efficiency and accuracy of target identification and antibody drug screening processes.Despite the promising prospects of tumor immunotherapy,certain limitations persist in its practical implementation.In conclusion,this paper offers a comprehensive examination of the cutting-edge developments in tumor immunotherapy,focusing on the aspects of tumor immunotherapy itself,critical targets for immunotherapy,and novel technologies and methodologies for antibody screening.This analysis is crucial for advancing the field of tumor immunotherapy and for enhancing both therapeutic efficacy and safety.Furthermore,research and development(R&D)of antibody drugs in other domains,such as autoimmune and inflammatory diseases,can benefit from it. 展开更多
关键词 Tumor immunotherapy Hotspot targets Antibody drug screening Target discovery Innovative technologies and methods
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A physics-based probabilistic method for assessment of landslide-induced wave run-up hazards 认领 引用 被引量：2
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作者 Ningjie Li Xinli Hu +3 位作者 Jian Wang Junxiang Huang Hongchao Zheng Wei Li 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期3675-3687,共13页
Traditional deterministic numerical simulation often has a poor prediction performance for landslide-induced wave run-up(LIWR)hazards,as it neglects the effects of uncertainty.The limitation for efficiently quantifyin... Traditional deterministic numerical simulation often has a poor prediction performance for landslide-induced wave run-up(LIWR)hazards,as it neglects the effects of uncertainty.The limitation for efficiently quantifying the uncertainties in primary parameters remains largely unsolved.In this study,we propose a probabilistic evaluation method,integrating the adaptive Kriging(AK)metamodel method and probability density evolution method(PDEM)based on generalized F-discrepancy.A Taylor expansion-based adaptive design strategy is applied to construct the global AK model over representative points generated by generalized F-discrepancy,thereby approximating the numerical physical response(i.e.,maximum LIWR).Using these approximate responses,the PDEM is used to compute the exceedance probabilities that LIWR heights exceed elements at risk based on a construction of virtual time,and then a probabilistic criterion is introduced to classify hazard zones.The proposed method is demonstrated via two examples:Example I,which possesses risk element(building),and Example Ⅱ with water-level variations.The results indicate that the proposed method has an acceptable performance(showing a 1.7%difference in exceedance probability compared to Monte Carlo simulation with 50,000 samples)with low computation cost(requiring 284 deterministic analyses).For two specific scenarios in this study,the wave induced by the landslide exhibits a solitary-like leading wave.The proposed probabilistic method provides promising prospects for quantifying LIWR uncertainties,and is helpful for direct,efficient,and low-cost quantification assessment of cascading hazards. 展开更多
关键词 Landslide-induced wave run-up(LIWR) Numerical simulation Adaptive metamodel Probability density evolution method(PDEM) Hazard zoning
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A method of characteristics for supersonic viscous flows 认领 引用 被引量：1
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作者 Bo ZHANG Yuxin ZHAO Shihe YI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第3期282-293,共12页
This paper develops a method of characteristics for supersonic viscous flows.The proposed method removes the inviscid and isentropic assumptions of the classical method of characteristics.The characteristic equations ... This paper develops a method of characteristics for supersonic viscous flows.The proposed method removes the inviscid and isentropic assumptions of the classical method of characteristics.The characteristic equations and compatibility equations are derived from the governing equations for compressible viscous flow.By combining the characteristic lines,the triangular interior unit process,quadrilateral interior unit process,and direct sonic point unit process are developed.The unit processes make up the characteristic net.The numerical algorithms consider the path of flow signal propagation.The inviscid terms are solved along characteristic lines,while the viscous terms are corrected through iterative whole-field computations.The proposed method has been applied to supersonic flat-plate boundary layer and verified by the similarity solution.The errors of velocity and temperature profiles are on the order of 0.1%,while the computation efficiency is the same as the classical method of characteristics.The accuracy and efficiency make the proposed method potential to become a basic tool of analysis and design for supersonic viscous flows. 展开更多
关键词 Characteristic line Compatibility equation Compressible flow Method of characteristics Supersonic flow Viscous flow
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Aeroelastic characteristics and vibration reduction method of NTBT rotor with TEF technology 认领 引用 被引量：1
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作者 Hualong WANG Xiayang ZHANG +4 位作者 Qijun ZHAO Li MA Wei BIAN Shiming LIU Yuan GONG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第2期263-282,共20页
A high-precision CFD/CSD(Computational Fluid Dynamics/Computational Structural Dynamics)coupling method is developed to study the aeroelastic behavior and design the vibration reduction strategy of NTBT(New Type Blade... A high-precision CFD/CSD(Computational Fluid Dynamics/Computational Structural Dynamics)coupling method is developed to study the aeroelastic behavior and design the vibration reduction strategy of NTBT(New Type Blade-Tip)rotor with TEF(Trailing Edge Flap)technology in forward flight.In the aspect of CSD method,the closed-form dynamical governing equation is modified using Hamilton’s principle to consider the influence of the movable TEF,in which the NTBT geometric nonlinearity is considered through coordinate transformation by virtue of finite element method.In the aspect of CFD method,a moving-embedded grid method for rotor blades is developed to account for the dynamic deflection of TEF,in which the grid deformation is achieved through algebraic transformations,and a high-precision unsteady CFD method with 5th-order TENO(Targeted Essentially Non-Oscillatory)scheme is introduced to effectively simulate the rotor flowfield.Considering the computational efficiency,the loosely-coupling strategy is introduced to build up the CFD/CSD method.The validity of the coupling method is verified by comparing the computed aerodynamic loads,frequency spectrum,and structural loads with the referential or the experimental results of the typical model rotors.Based on that,the frequency,phase,and amplitude-sweeping parametric analyses of TEF are conducted thoroughly to reveal the influence mechanisms on the aeroelastic characteristics of NTBT rotor.Furthermore,an optimal control strategy is proposed to suppress the vibration intensity of hub loads,showing that the active vibration reduction method can effectively suppress the rotor hub vibratory intensity by over 40%in typical forward flight conditions. 展开更多
关键词 CFD/CSD method NTBT geometry Rotor aeroelasticity Trailing Edge Flap(TEF) Vibration reduction
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Correction models of Reynolds number effects for through-flow method in axial compressors 认领 引用 被引量：1
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作者 Xiaochen WANG Chunwei GU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第1期78-94,共17页
Aerodynamic performances of axial compressors are significantly affected by variation of Reynolds number in aero-engines.In the design and analysis of compressors,previous correction methods for cascades and stages ha... Aerodynamic performances of axial compressors are significantly affected by variation of Reynolds number in aero-engines.In the design and analysis of compressors,previous correction methods for cascades and stages have difficulties in predicting comprehensively Reynolds number effects on airfoils,matching and characteristics curves.This study proposes Re-correction models for loss,deviation angle and endwall blockage based on classical theories and cascade tests,and loss and deviation models show good agreement in test data of NACA65 and C4 cascades.Throughflow method considering Reynolds number effects is developed by integrating the correction models into a verified Streamline Curvature(SLC)tool.A three-stage axial compressor is investigated through SLC and CFD methods from design Reynolds number(Red=2106)to low Re=4104,and the numerical methods are validated with test data of characteristic curves and spanwise distributions at Red.With Re reduction,SLC method with correction models well predicts variation in overall performances compared with CFD calculations and Wassell's model.Streamwise and spanwise matching such as total pressure and loss distributions in SLC predictions are basically consistent with those in CFD results at near-stall points under design and low Reynolds numbers.SLC and CFD methods share similar detections of stall risks in the third stage(Stg3),and their analyses of diffusion processes deviate to some extent due to different predictions in separated endwall flow.The correction models can be adopted to consider Reynolds number effects in through-flow design and analysis of axial compressors. 展开更多
关键词 Axial compressor Reynolds number effects Correction model Through-flow method Aerodynamic performance
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基于SBAS-InSAR的青藏铁路沿线冻土区形变监测及预测分析 认领 引用
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作者 刘军彦 李根军 +2 位作者 王世杰 祁月基 郑磊 《地球科学进展》 CAS CSCD 北大核心 2026年第3期313-327,共15页
青藏铁路跨越约550 km的多年冻土区,铁路安全运营的关键取决于冻土层稳定性。选择铁路冻土段沿线2022年10月至2024年12月的Sentinel-1A升降轨数据,利用SBAS-InSAR技术反演形变特征并分析驱动因子,融合多模型优势构建预测模型并分析。结... 青藏铁路跨越约550 km的多年冻土区,铁路安全运营的关键取决于冻土层稳定性。选择铁路冻土段沿线2022年10月至2024年12月的Sentinel-1A升降轨数据,利用SBAS-InSAR技术反演形变特征并分析驱动因子,融合多模型优势构建预测模型并分析。结果表明:(1)铁路沿线视线(Line of Sight)向升降轨形变速率分别为-35~42 mm/a和-36.5~30 mm/a;在忽略南北向地表形变前提下,垂直和东西向平均速率分别为-1.62 mm/a和2.31 mm/a,表现为下沉和向东运动。(2)基于“热力—水文—地形”耦合分析,各因子与形变速率均呈正相关,地表温度与活动层厚度为主控因素,贡献度为62.4%;坡度(21.4%)决定形变的方向;气温(16.2%)通过地表能量转换间接驱动。气温和地温升高引发活动层增厚导致融沉,在坡度作用下转化为坡向蠕滑位移。(3)基于分层阈值法识别出3类形变强度区,其中强形变区威胁路基稳定,中形变区存在冻土蠕滑风险,弱形变区形变受河流作用控制。特征点时序分析揭示了冻土区典型的季节性冻胀融沉规律及水热与沉积叠加影响。(4)预测分析了P1~P7共7个特征点的形变趋势。结果表明,混合模型在各特征点上的预测精度均优于单一模型,周期性特征点未来6个月的形变趋势与实际形变高度吻合,在所选特征点上表现出良好的预测性能。研究结果验证了该方法在冻土区铁路沿线形变监测中的应用潜力,可为铁路稳定性评估与路基维护提供参考。 展开更多
关键词 地表形变 SBAS-InSAR 预测模型 青藏铁路沿线冻土区
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基于水文单元划分的SBAS-InSAR湿地水位监测方法——以美国路易斯安那州为例 认领 引用
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作者 赵金奇 沈昶旭 +4 位作者 司锦钊 王子璇 周正培 牛玉芬 路中 《遥感学报》 EI CAS CSCD 北大核心 2026年第4期1009-1024,共16页
作为湿地最重要的生态指标之一,水位直接反映了湿地的水文过程与生态格局,对其进行高效、准确的监测是湿地保护与恢复的关键。合成孔径雷达干涉测量InSAR(Interferometric Synthetic Aperture Radar)凭借其大范围、全天时、全天候和高... 作为湿地最重要的生态指标之一,水位直接反映了湿地的水文过程与生态格局,对其进行高效、准确的监测是湿地保护与恢复的关键。合成孔径雷达干涉测量InSAR(Interferometric Synthetic Aperture Radar)凭借其大范围、全天时、全天候和高精度的优势,已被成功应用于湿地水位监测。然而,湿地内部水文连通性存在显著差异,导致传统InSAR技术在大范围水位解算时面临跨水文单元解缠误差以及水位基准不统一等问题。针对上述问题,本文提出了一种基于水文单元划分的短基线集干涉测量SBAS-InSAR(Small Baseline Subset InSAR)湿地绝对水位变化监测方法。首先,利用多期Sentinel-1 SAR影像和全球土地覆盖数据,综合分析研究区水文连通性,将其划分为多个独立的水文单元。进一步,在各水文单元内,构建短基线干涉网络获取相对水位变化时间序列,并结合水文站点数据进行校准。最后,采用最小二乘法获取绝对水位变化的时空分布。以美国路易斯安那州洪泛平原为试验区验证本文方法的有效性,实验结果表明:(1)水文单元划分能够显著提高时序解算的可靠性,总体均方根误差由13.20 cm降至4.03 cm;(2)堤坝与城市等阻隔物显著地改变了湿地水位的空间连续性;(3)C波段在湿地的相干性具有显著季节性差异,深冬—早春最高,夏末—初秋最低,主要受植被物候与淹没状态影响。本文基于水文单元划分的SBAS-InSAR技术可实现大范围、厘米级的湿地水位变化监测,为湿地水资源管理与生态保护提供一定的技术支撑。 展开更多
关键词 湿地 水文单元 SBAS-InSAR 多参考点校正 绝对水位
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A Comparative Study of State-of-the-Art Meshless Methods for Flow and Transport Simulation in Porous Media 认领 引用
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作者 T.I.Eldho Sanjukta Das +1 位作者 Aatish Anshuman Tinesh Pathania 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第5期828-852,共25页
In recent years,meshless methods have been increasingly applied to the simulation of various engineering problems due to their inherent advantages over traditional mesh-based approaches,including greater flexibility,i... In recent years,meshless methods have been increasingly applied to the simulation of various engineering problems due to their inherent advantages over traditional mesh-based approaches,including greater flexibility,independence from predefined meshing,simpler adaptive analysis,improved automation,and suitability for complex problems.Several meshless methods have been used for porous media simulation,and are broadly categorized into collocation,global weak form and local weak form methods.In this study,a comprehensive comparison of the applicability of these three categories of meshless methods for simulating coupled flow and transport problems in porous media is presented.The Radial Point Collocation Method(RPCM)(strong form),the Element Free Galerkin Method(EFGM)(global weak form)and the Meshless Local Petrov Galerkin(MLPG)method(local weak form)are implemented and systematically compared.These methods are applied to the analysis of flow in a synthetic regular domain aquifer,flow and non-reactive contaminant transport in a synthetic irregular boundary porous media problem and groundwater flow in a field aquifer located in India.The simulated groundwater heads are compared with analytical solution,observed field data and results obtained from widely used MODFLOW-MT3DMS models.The deviation of the solutions from the analytical solution is in the range of O.67%to O.l6%for the hypothetical case study.For the field-scale case study,mean absolute error of 0.183%,0.18l%and 0.188%are obtained for the RPCM,EFGM and MLPG models,respectively,outperforming MODFLOW,which exhibits a deviation of 0.254%from observed values.Overall,the present study reaffirms the practical applicability of these meshless methods for real-world groundwater problems and provides valuable insights into the utilization of each category of meshless method,with respect to problem type,computational efficiency and accuracy requirements. 展开更多
关键词 Meshless methods groundwater flow contaminant transport radial point collocation method element free Galerkin method meshless local Petrov Galerkin method
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联合SBAS-InSAR与Offset-Tracking技术的矿区三维形变监测 认领 引用
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作者 季民 车可可 +2 位作者 张兆民 窦凤珂 马梦彤 《大地测量与地球动力学》 CSCD 北大核心 2026年第5期618-627,共10页
针对常规SBAS-InSAR方法形变监测维度不足,难以有效反映矿区地表三维形变的问题,在SBAS-InSAR技术的基础上,联合Offset-Tracking技术,构建一种融合升降轨SAR数据的三维形变解算方法。以硫磺沟煤矿为例,进行矿区地表三维形变解算实验,得... 针对常规SBAS-InSAR方法形变监测维度不足,难以有效反映矿区地表三维形变的问题,在SBAS-InSAR技术的基础上,联合Offset-Tracking技术,构建一种融合升降轨SAR数据的三维形变解算方法。以硫磺沟煤矿为例,进行矿区地表三维形变解算实验,得到三维形变反演结果,并对沉降量级、影响范围及空间分布进行系统分析。引入水准数据,将三维形变反演结果与传统升降轨SBAS-InSAR二维形变结果进行精度对比验证,分析三维分解方法相对于现有二维分解方法的优势,发现三维解算方法较二维方法更加贴合实际水准数据,反演精度更高。结果表明,构建的三维解算方法在一定程度上提高了SBAS-InSAR的监测精度,拓展了SBAS-InSAR技术的监测维度,为矿区地表形变监测提供了一种新型有效的技术参考。 展开更多
关键词 三维形变监测 矿区形变 SBAS-InSAR Offset-Tracking 硫磺沟煤矿
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基于升降轨SBAS-InSAR的川藏铁路拉萨—桑日段潜在滑坡识别 认领 引用
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作者 白淑英 彭达 +2 位作者 谢涛 张慧 朱杨贵 《测绘通报》 CSCD 北大核心 2026年第7期149-155,共7页
[目的]川藏铁路拉萨—桑日段位于青藏高原冈底斯山复杂构造带,滑坡频发,精准识别潜在滑坡风险区域,对铁路的建设与运营安全具有重要意义。[方法]本文以川藏铁路拉萨—桑日段沿线10 km缓冲区范围为研究区,基于2021—2023年Sentinel-1A升... [目的]川藏铁路拉萨—桑日段位于青藏高原冈底斯山复杂构造带,滑坡频发,精准识别潜在滑坡风险区域,对铁路的建设与运营安全具有重要意义。[方法]本文以川藏铁路拉萨—桑日段沿线10 km缓冲区范围为研究区,基于2021—2023年Sentinel-1A升降轨数据和SBAS-InSAR技术反演地表形变。[结果]研究区的升降轨形变速率值分别为-41.33~15.74 mm/a、-54.45~13.9 mm/a,并进行二维形变分解获取垂向与东西向形变,结合高分影像综合识别潜在滑坡90处,所有识别结果均位于高与极高滑坡风险区,蠕变指数α均大于0,表明潜在滑坡处于缓慢加速形变阶段。[结论]该方法可为川藏铁路沿线滑坡的预测预警与防灾减灾提供科学支撑。 展开更多
关键词 川藏铁路 潜在滑坡识别 SBAS-InSAR Sentinel-1A
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