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Dynamic Process Monitoring Based on Dot Product Feature Analysis for Thermal Power Plants 认领 引用
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作者 Xin Ma Tao Chen Youqing Wang 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2025年第3期563-574,共12页
Data-driven process monitoring is an effective approach to assure safe operation of modern manufacturing and energy systems,such as thermal power plants being studied in this work.Industrial processes are inherently d... Data-driven process monitoring is an effective approach to assure safe operation of modern manufacturing and energy systems,such as thermal power plants being studied in this work.Industrial processes are inherently dynamic and need to be monitored using dynamic algorithms.Mainstream dynamic algorithms rely on concatenating current measurement with past data.This work proposes a new,alternative dynamic process monitoring algorithm,using dot product feature analysis(DPFA).DPFA computes the dot product of consecutive samples,thus naturally capturing the process dynamics through temporal correlation.At the same time,DPFA's online computational complexity is lower than not just existing dynamic algorithms,but also classical static algorithms(e.g.,principal component analysis and slow feature analysis).The detectability of the new algorithm is analyzed for three types of faults typically seen in process systems:sensor bias,process fault and gain change fault.Through experiments with a numerical example and real data from a thermal power plant,the DPFA algorithm is shown to be superior to the state-of-the-art methods,in terms of better monitoring performance(fault detection rate and false alarm rate)and lower computational complexity. 展开更多
关键词 Computational complexity dot product feature analysis(DPFA) dynamic process multivariate statistics process monitoring
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A wind tunnel simulation of the dynamic processes involved in sand dune formation on the western coast of Hainan Island 认领 引用 被引量：12
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作者 LI Sen LIU Xianwan +2 位作者 LI Huichuan ZHENG Yinghua WEI Xinghu 《Journal of Geographical Sciences》 SCIE 2007年第4期453-468,共16页
The western coast of Hainan Island exhibits a savanna landscape. Many types of sand dunes, including transverse dune ridges, longitudinal dune ridges, elliptical dunes, coppice dunes, and climbing dunes, are widely di... The western coast of Hainan Island exhibits a savanna landscape. Many types of sand dunes, including transverse dune ridges, longitudinal dune ridges, elliptical dunes, coppice dunes, and climbing dunes, are widely distributed in the coastal zone. In winter, high-frequency and high-energy NE winds （dominant winds） are prevalent, with a resultant drift direction （RDD） of S35.6°W. In spring, low-frequency and low-energy SW secondary winds prevail, with a RDD of N25.1°E. Wind tunnel simulations revealed that the airflow over the dune surface is the main factor controlling the erosion and deposition patterns of dune surfaces and the morphological development of dunes. In the region＇s bidirectional wind environment, with two seasonally distinct energy levels, the airflow over the surface of elliptical dunes, barchan dunes, and transverse dune ridges will exhibit a transverse pattern, whereas the airflow over longitudinal dunes ridges exhibits a lateral pattern and that over climbing dunes exhibits a climbing-circumfluent pattern. These patterns represent different dynamic processes. The coastal dunes on the western coast of Hainan Island are influenced by factors such as onshore winds, sand sources, coastal slopes, rivers, and forest shelter belts. The source of the sand that supplements these dunes particularly influences the development pattern： when there is more sand, the pattern shows positive equilibrium deposition between dune ridges and dunes; otherwise, it shows negative equilibrium deposition. The presence or absence of forest shelter belts also influences deposition and dune development patterns and transformation of dune forms. Coastal dunes and inland desert dunes experience similar dynamic processes, but the former have more diversified shapes and more complex formation mechanisms. 展开更多
关键词 western coast of Hainan Island coastal dune surface airflow dynamic processes wind tunnel simulation
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Dynamic process of trace boron non-equilibrium grain boundary segregation and the effect of cooling rate 认领 引用 被引量：2
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作者 PingWu XinlaiHe +1 位作者 BingCao SenChen 《Journal of University of Science and Technology Beijing》 2003年第3期30-34,共5页
The dynamic process of non-equilibrium grain boundary segregation of traceboron in Fe-40 percent Ni alloy during cooling and the effect of cooling rate were investigated byboron tracking autoradiography technique. The... The dynamic process of non-equilibrium grain boundary segregation of traceboron in Fe-40 percent Ni alloy during cooling and the effect of cooling rate were investigated byboron tracking autoradiography technique. The results indicate that during cooling process, theamount of segregated boron on grain boundary firstly increases fast, then enters a comparativelyeven increasing stage and increases rapidly again at the third stage. The details of each stagevaried with cooling rate are explained. When the segregation develops to a certain degree, thesegregated boron atoms transform from solute status to precipitate status. 展开更多
关键词 boron grain boundary non-equilibrium segregation dynamic process
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Numerical investigations on dynamic process of muzzle flow 认领 引用 被引量：1
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作者 姜孝海 范宝春 李鸿志 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2008年第3期351-360,共10页
The integrative process of a quiescent projectile accelerated by high-pressure gas to shoot out at a supersonic speed and beyond the range of a precursor flow field was simulated numerically. The calculation was based... The integrative process of a quiescent projectile accelerated by high-pressure gas to shoot out at a supersonic speed and beyond the range of a precursor flow field was simulated numerically. The calculation was based on ALE equations and a second-order precision Roe method that adopted chimera grids and a dynamic mesh. From the predicted results, the coupling and interaction among the precursor flow field, propellant gas flow field and high-speed projectile were discussed in detail. The shock-vortex interaction, shockwave reflection, shock-projectile interaction with shock diffraction, and shock focus were clearly demonstrated to explain the effect on the acceleration of the projectile. 展开更多
关键词 gasdynamics numerical simulation muzzle flow dynamic process
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Deep structure of the Southeast Asian curved subduction system and its dynamic process 认领 引用 被引量：1
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作者 Weiwei DING 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2024年第3期701-704,共4页
The deep structure,material circulation,and dynamic processes in the Southeast Asia have long been an elusive scientific puzzle due to the lack of systematic scientific observations and recognized theoretical models.B... The deep structure,material circulation,and dynamic processes in the Southeast Asia have long been an elusive scientific puzzle due to the lack of systematic scientific observations and recognized theoretical models.Based on the deep seismic tomography using long-period natural earthquake data,in this study,the deep structure and material circulation of the curved subduction system in Southeast Asia was studied,and the dynamic processes since 100 million years ago was reconstructed.It is pointed out that challenges still exist in the precise reconstruction of deep mantle structures of the study area,the influence of multi-stage subduction on deep material exchange and shallow magma activity,as well as the spatiotemporal evolution and coupling mechanism of multi-plate convergence.Future work should focus on high-resolution land-sea joint 3-D seismic tomography imaging of the curved subduction system in the Southeast Asia,combined with geochemical analysis and geodynamic modelling works. 展开更多
关键词 curved subduction system deep structure material recycling dynamic process Southeast Asia
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Photo-induced doping effect and dynamic process in monolayer MoSe2 认领 引用 被引量：2
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作者 Qian Yang Yongzhou Xue +2 位作者 Hao Chen Xiuming Dou Baoquan Sun 《Journal of Semiconductors》 EI CAS CSCD 2020年第8期63-67,共5页
Dynamic processes of electron transfer by optical doping in monolayer MoSe2 at 6 K are investigated via measuring time resolved photoluminescence(PL)traces under different excitation powers.Time-dependent electron tra... Dynamic processes of electron transfer by optical doping in monolayer MoSe2 at 6 K are investigated via measuring time resolved photoluminescence(PL)traces under different excitation powers.Time-dependent electron transfer process can be analyzed by a power-law distribution of t^−α withα=0.1-0.24,depending on the laser excitation power.The average electron transfer time of approximately 27.65 s is obtained in the excitation power range of 0.5 to 100μW.As the temperature increases from 20 to 44 K,the energy difference between the neutral and charged excitons is observed to decrease. 展开更多
关键词 photodoping monolayer MoSe2 dynamic process temperature
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Multinanoparticle Translocations in Phospholipid Membranes:Translocation Modes and Dynamic Processes 认领 引用 被引量：1
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作者 Ping-ping Xia Yue Shan +3 位作者 Lin-li He Yong-yun Jia Xiang-hong Wang Shi-ben Li 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2020年第4期468-476,I0002,共9页
Multinanoparticles interacting with the phospholipid membranes in solution were studied by dissipative particle dynamics simulation.The selected nanoparticles have spherical or cylindrical shapes,and they have various... Multinanoparticles interacting with the phospholipid membranes in solution were studied by dissipative particle dynamics simulation.The selected nanoparticles have spherical or cylindrical shapes,and they have various initial velocities in the dynamical processes.Several translocation modes are defined according to their characteristics in the dynamical processes,in which the phase diagrams are constructed based on the interaction strengths between the particles and membranes and the initial velocities of particles.Furthermore,several parameters,such as the system energy and radius of gyration,are investigated in the dynamical processes for the various translocation modes.Results elucidate the effects of multiparticles interacting with the membranes in the biological processes. 展开更多
关键词 Multinanoparticle Phospholipid membrane Translocation mode Dynamic process
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Numerical modeling dynamic process of multi-feed microwave heating of industrial solution media 认领 引用 被引量：7
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作者 杨彪 孙俊 +7 位作者 李玮 彭金辉 李幼灵 罗会龙 郭胜惠 张竹敏 苏鹤州 史亚鸣 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第12期3192-3203,共12页
The exothermic efficiency of microwave heating an electrolyte/water solution is remarkably high due to the dielectric heating by orientation polarization of water and resistance heating by the Joule process occurred s... The exothermic efficiency of microwave heating an electrolyte/water solution is remarkably high due to the dielectric heating by orientation polarization of water and resistance heating by the Joule process occurred simultaneously compared with pure water.A three-dimensional finite element numerical model of multi-feed microwave heating industrial liquids continuously flowing in a meter-scale circular tube is presented.The temperature field inside the applicator tube in the cavity is solved by COMSOL Multiphysics and professional programming to describe the momentum,energy and Maxwell's equations.The evaluations of the electromagnetic field,the temperature distribution and the velocity field are simulated for the fluids dynamically heated by singleand multi-feed microwave system,respectively.Both the pilot experimental investigations and numerical results of microwave with single-feed heating for fluids with different effective permittivity and flow rates show that the presented numerical modeling makes it possible to analyze dynamic process of multi-feed microwave heating the industrial liquid.The study aids in enhancing the understanding and optimizing of dynamic process in the use of multi-feed microwave heating industrial continuous flow for a variety of material properties and technical parameters. 展开更多
关键词 microwave with multi-feed heating industrial flow dynamical process numerical computation solution media
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On the Kinematic Characteristics and Dynamic Process of Boundary faults of the Nansha Ultra-crust Layer-Block 认领 引用 被引量：13
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作者 LIU Hailing SUN Yan +4 位作者 GUO Lingzhi SHU Liangshu YANG Shukang ZHOU Di ZHANG Yixiang 《Acta Geologica Sinica(English Edition)》 SCIE CAS 1999年第4期452-463,共12页
Abstract The Nansha ultra-crust layer-block is confined by ultra-crustal boundary faults of distinctive features, bordering the Kangtai-Shuangzi-Xiongnan extensional faulted zone on the north, the Baxian-Baram-Yoca-Cu... Abstract The Nansha ultra-crust layer-block is confined by ultra-crustal boundary faults of distinctive features, bordering the Kangtai-Shuangzi-Xiongnan extensional faulted zone on the north, the Baxian-Baram-Yoca-Cuyo nappe faulted zone on the south, the Wan'an-Natuna strike-slip tensional faulted zone on the west and the Mondoro-Panay strike-slip compressive faulted zone on the east. These faults take the top of the Nansha asthenosphere as their common detachmental surface. The Cenozoic dynamic process of the ultra-crust layer-block can be divided into four stages: K2-E21, during which the northern boundary faults extended, this ultra-crust layer-block was separated from the South China-Indosinian continental margin, the Palaeo-South China Sea subducted southwards and the Sibu accretion wedge was formed; E22-E31, during which the Southwest sub-sea basin extended and orogeny was active due to the collision of the Sibu accretion wedge; E32-N11, during which the central sub-sea basin extended, the Miri accretion wedge was formed and “A-type” subduction of the southern margin of the north Balawan occurred; N12-the present, during which large-scale thrusting and napping of the boundary faults in the south and mountain-building have taken place and the South China Sea stopped its extension. 展开更多
关键词 Nansha ultra-crust layer-block boundary fault layer slip glide dip slip strike slip fault system dynamic process
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Experimental studies of focal mechanism based on the dynamic process of energy release 认领 引用
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作者 郑熙铭 高后秀 +2 位作者 杨渝钦 杨敬宇 李志雄 《Acta Seismologica Sinica(English Edition)》 1997年第3期113-118,共6页
ExperimentalstudiesoffocalmechanismbasedonthedynamicprocesofenergyreleaseXIMINGZHENG1）（郑熙铭）HOUXIUGAO2）（高后秀）YUQINYANG2）（杨渝...
关键词 seismic mechanism dynamic process similarity experimental study
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Effect of Nonlinear Dynamic Process on Formation and Breakdown of Blocking 认领 引用
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作者 张佩 倪允琪 《Advances in Atmospheric Sciences》 SCIE CAS 1991年第1期41-50,共10页
With the L-P approximate method(variation of parameter method), a barotropic channel model in β-plane is used to study the effect of nonlinear interaction between two waves with different scales on the formation of b... With the L-P approximate method(variation of parameter method), a barotropic channel model in β-plane is used to study the effect of nonlinear interaction between two waves with different scales on the formation of blocking. The approximate analytical solution, which can describe the process of the blocking formation, maintenance and breakdown, has been obtained by using the method of aproximate expansion. The importance of nonlinear interaction between two waves with different scales is stressed in the solution. The result suggests that the nonlinear interaction is the main dynamic process of the blocking formation. Some required conditions of blocking formation are also discussed. 展开更多
关键词 Pro Effect of Nonlinear Dynamic Process on Formation and Breakdown of Blocking
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Neural Network Modeling and System Simulating for the Dynamic Process of Varied Gap Pulsed GTAW with Wire Filler 认领 引用
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作者 Guangjun ZHANG Shanben CHEN Lin WU 《Journal of Materials Science & Technology》 SCIE EI CAS 2005年第4期515-520,共6页
As the base of the research work on the weld shape control during pulsed gas tungsten arc welding （GTAW） with wire filler, this paper addressed the modeling of the dynamic welding process. Topside length Lt, maximum... As the base of the research work on the weld shape control during pulsed gas tungsten arc welding （GTAW） with wire filler, this paper addressed the modeling of the dynamic welding process. Topside length Lt, maximum width Wt and half-length ratio Rh1 were selected to depict topside weld pool shape, and were measured on-line by vision sensing. A dynamic neural network model was constructed to predict the usually unmeasured backside width and topside height of the weld through topside shape parameters and welding parameters. The inputs of the model were the welding parameters （peak current, pulse duty ratio, welding speed, filler rate）, the joint gap, the topside pool shape parameters （Lt, Wt, and Rh1）, and their history values at two former pulse, a total of 24 numbers. The validating experiment results proved that the artificial neural network （ANN） model had high precision and could be used in process control. At last, with the developed dynamic model, steady and dynamic behavior was analyzed by simulation experiments, which discovered the variation rules of weld pool shape parameters under different welding parameters, and further knew well the characteristic of the welding process. 展开更多
关键词 Modeling Neural network Dynamic welding process Pulsed GTAW
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Study on the Medical Image Distributed Dynamic Processing Method 认领 引用
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作者 Zhang Quanhai & Shi PengfeiInstitute of Image Processing and Pattern Recognition, Shanghai Jiaotong University, Shanghai 200030, P. R. China 《Journal of Systems Engineering and Electronics》 EI 2003年第4期69-76,共8页
To meet the challenge of implementing rapidly advanced, time-consuming medical image processing algorithms, it is necessary to develop a medical image processing technology to process a 2D or 3D medical image dynamica... To meet the challenge of implementing rapidly advanced, time-consuming medical image processing algorithms, it is necessary to develop a medical image processing technology to process a 2D or 3D medical image dynamically on the web. But in a premier system, only static image processing can be provided with the limitation of web technology. The development of Java and CORBA (common object request broker architecture) overcomes the shortcoming of the web static application and makes the dynamic processing of medical images on the web available. To develop an open solution of distributed computing, we integrate the Java, and web with the CORBA and present a web-based medical image dynamic processing methed, which adopts Java technology as the language to program application and components of the web and utilies the CORBA architecture to cope with heterogeneous property of a complex distributed system. The method also provides a platform-independent, transparent processing architecture to implement the advanced image routines and enable users to access large dataset and resources according to the requirements of medical applications. The experiment in this paper shows that the medical image dynamic processing method implemented on the web by using Java and the CORBA is feasible. 展开更多
关键词 medical image dynamic processing based on web distributed computing interoperation CORBA.
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Safety evaluation of rectisol process based on quantitative hazard and operability analysis 认领 引用
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作者 Haiyan Zhang Peirui Li +6 位作者 Zhonglin Zhang Xiaogang Hao Yuan Zhou Xiaolu Wu Jingxuan Yang Abuliti Abudulad Guoqing Guan 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2026年第2期33-44,共12页
In order to break through the limitations of the traditional hazard and operability(HAZOP)analysis,this study established a gray evaluation model based on gray theory for the riskiness ranking of deviations and semi-q... In order to break through the limitations of the traditional hazard and operability(HAZOP)analysis,this study established a gray evaluation model based on gray theory for the riskiness ranking of deviations and semi-quantitative analysis of risk levels.A quantitative HAZOP analysis combining HAZOP with Aspen Plus,Aspen Dynamics,Fault Tree Analysis(FTA),Risk Matrix and Layer of Protection Analysis(LOPA)was performed for high risk deviations.The dynamic model of the methanol washing unit in the rectisol process was established by Aspen Dynamics and the effects of different deviations on the risk indicators and operability indicators were investigated.Then,the risk of deviations was ranked according to the simulation results and the high-risk deviations were identified.Subsequently,the sensitivity analysis module of Aspen Plus software was used to calculate the fluctuationrange of highrisk deviations,whose results were imported into Aspen Dynamics to simulate and analyze the risk level of accidents,and then FTA was used to quantify the probability of accidents.Synchronizing the two to the risk matrix determined the deviations to have initial risk ratings of 10 and 15,both of which are high-risk deviations.The HAZOP quantitative analysis report is finalizedafter reducing the residual risk level of the deviation to 9(low risk)through LOPA analysis.The results of the case study showed that the method can verify the accuracy of the gray evaluation model to a certain extent,and the quantitative HAZOP analysis report is of guiding significancefor actual production. 展开更多
关键词 Quantitative HAZOP analysis Rectisol process Gray evaluation model Aspen Plus Dynamic process simulation Deviation riskiness ranking
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Well-posedness and exponential stability of a dynamic frictionless contact problem with normal compliance and infinite memory 认领 引用
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作者 Imane Ouakil Benyattou Benabderrahmane Yamna Boukhatem 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2026年第1期99-119,共21页
A model for dynamic frictionless contact between a viscoelastic body and foundation is considered.The viscoelastic constitutive law is assumed to be nonlinear and the contact is modelled with the normal compliance con... A model for dynamic frictionless contact between a viscoelastic body and foundation is considered.The viscoelastic constitutive law is assumed to be nonlinear and the contact is modelled with the normal compliance condition.We obtain the well-posedness using nonlinear semigroup theory arguments.Moreover,the exponential stability result of the solution is shown by using the energy method to produce a suitable Lyapunov function. 展开更多
关键词 dynamic process viscoelastic body normal compliance nonlinear semigroup theory exponential stability
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The dynamic and thermodynamic processes dominating the reduction of global land monsoon precipitation driven by anthropogenic aerosols emission 认领 引用 被引量：15
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作者 Tianjun ZHOU Wenxia ZHANG +5 位作者 Lixia ZHANG Xuebin ZHANG Yun QIAN Dongdong PENG Shuangmei MA Buwen DONG 《Science China Earth Sciences》 SCIE EI CAS CSCD 2020年第7期919-933,共15页
Changes in monsoon precipitation have profound social and economic impacts as more than two-thirds of the world’s population lives in monsoon regions.Observations show a significant reduction in global land monsoon p... Changes in monsoon precipitation have profound social and economic impacts as more than two-thirds of the world’s population lives in monsoon regions.Observations show a significant reduction in global land monsoon precipitation during the second half of the 20 th century.Understanding the cause of this change,especially possible anthropogenic origins,is important.Here,we compare observed changes in global land monsoon precipitation during 1948–2005 with those simulated by 5 global climate models participating in the Coupled Model Inter-comparison Project-phase 5(CMIP5)under different external forcings.We show that the observed drying trend is consistent with the model simulated response to anthropogenic forcing and to anthropogenic aerosol forcing in particular.We apply the optimal fingerprinting method to quantify anthropogenic influences on precipitation and find that anthropogenic aerosols may have contributed to 102%(62–144%for the 5–95%confidence interval)of the observed decrease in global land monsoon precipitation.A moisture budget analysis indicates that the reduction in precipitation results from reduced vertical moisture advection in response to aerosol forcing.Since much of the monsoon regions,such as India and China,have been experiencing rapid developments with increasing aerosol emissions in the past decedes,our results imply a further reduction in monsoon precipitation in these regions in the future if effective mitigations to reduce aerosol emissions are not deployed.The observed decline of aerosol emission in China since 2006 helps to alleviate the reducing trend of monsoon precipiptaion. 展开更多
关键词 Global monsoon Detection Attribution Aerosol forcing Dynamic and thermodynamic processes
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Investigation of Dynamic Multivariate Chemical Process Monitoring 认领 引用 被引量：5
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作者 谢磊 张建明 王树青 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2006年第5期559-568,共10页
Chemical process variables are always driven by random noise and disturbances. The closed-loop con-trol yields process measurements that are auto and cross correlated. The influence of auto and cross correlations on s... Chemical process variables are always driven by random noise and disturbances. The closed-loop con-trol yields process measurements that are auto and cross correlated. The influence of auto and cross correlations on statistical process control (SPC) is investigated in detail by Monte Carlo experiments. It is revealed that in the sense of average performance, the false alarms rates (FAR) of principal component analysis (PCA), dynamic PCA are not affected by the time-series structures of process variables. Nevertheless, non-independent identical distribution will cause the actual FAR to deviate from its theoretic value apparently and result in unexpected consecutive false alarms for normal operating process. Dynamic PCA and ARMA-PCA are demonstrated to be inefficient to remove the influences of auto and cross correlations. Subspace identification-based PCA (SI-PCA) is proposed to improve the monitoring of dynamic processes. Through state space modeling, SI-PCA can remove the auto and cross corre-lations efficiently and avoid consecutive false alarms. Synthetic Monte Carlo experiments and the application in Tennessee Eastman challenge process illustrate the advantages of the proposed approach. 展开更多
关键词 multivariate statistical processes control subspace identification false alarms rate dynamic processes
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Study on the Dynamic Process of the Onset of South China Sea Summer Monsoon 认领 引用 被引量：1
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作者 张立凤 张永垂 张铭 《Acta meteorologica Sinica》 2008年第4期511-521,共11页
By using the NCEP/NCAR reanalysis data from 1958 to 1997, we first looked into the atmospheric flow conditions in the one month immediately prior to the onset of the South China Sea summer monsoon （SCSSM） each year.... By using the NCEP/NCAR reanalysis data from 1958 to 1997, we first looked into the atmospheric flow conditions in the one month immediately prior to the onset of the South China Sea summer monsoon （SCSSM） each year. A monthly-averaged zonal basic flow of 40-yr composite was then calculated. The stability of Rossby wave in the basic flow was studied based on the spherical barotropic vorticity equation. Furthermore, the spectral function expansion method was adopted to define and compute the evolvement of a developing wave packet. The results indicate that there exists barotropic instability of spherical Rossby wave in the climatically-averaged flow field before the SCSSM onset. The instability is triggered by the westerly jet stream in the Southern Hemisphere, and the strongest instable perturbation lies to the south of the westerly jet stream. The peak of the developing spherical Rossby wave packet propagates from mid and high latitudes to low latitudes, though not crossing the equator, spurring the cumulus convection in the tropical zones. The eruption of the cumulus convection and its spread to monsoon regions help to speed up the adjustment of the general circulation and the SCSSM onset. It is concluded that elements that contribute to the SCSSM onset are on global scale, albeit the onset itself looks like a local phenomenon. 展开更多
关键词 SCSSM onset spherical barotropic instability- tropic cumulus convection developing wave packet dynamic process
Dynamic subduction process of local plate revealed by Ibaraki earthquake sequence of 1982 in Japan 认领 引用 被引量：2
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作者 DIAO Gui-ling 《Acta Seismologica Sinica(English Edition)》 2001年第2期141-147,共7页
The kinematics and dynamics of plate tectonics are frontal subjects in geosciences and the strong earthquake occurred along the plate boundary result directly from plate movement. By analyzing Ibaraki earthquake seque... The kinematics and dynamics of plate tectonics are frontal subjects in geosciences and the strong earthquake occurred along the plate boundary result directly from plate movement. By analyzing Ibaraki earthquake sequence, it has been found that the focal fault plane shows a special image of grading expansion along the direction of strike and adjustment along the dip direction respectively. With the consideration of strike, dip and slip directions of focal mechanism, we have confirmed that Ibaraki earthquake belongs to a thrust fault earthquake occurred under the Japan Trench. The cause of the earthquake sequence is discussed in the paper. The study on the temporal-spatial distribution of the earthquake sequence with a time-scale between the year-scale spatial geodetic data and the second-scale moment tensor of the strong earthquake has indicated the dynamic process of Pacific Plate subduction under the Eurasia Plate. According to the average slip distance of earthquake and the velocity of plate movement, it is predicted that a strong earthquake might occur in recent years. 展开更多
关键词 earthquake sequence plate tectonics subduction zone dynamic process
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Dynamic characteristics of large-scale ice avalanches under the effect of frictional heat 认领 引用 被引量：1
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作者 LUO Yu CHEN Qiang +1 位作者 ZHU Lei YAN Tengfei 《Journal of Mountain Science》 SCIE CSCD 2025年第12期4540-4554,共15页
Large-scale ice avalanches pose serious risks owing to their high speed and long travel distances,and their mobility is increased by ice melting owing to frictional heat.Most motion models for largescale ice avalanche... Large-scale ice avalanches pose serious risks owing to their high speed and long travel distances,and their mobility is increased by ice melting owing to frictional heat.Most motion models for largescale ice avalanches have been constructed for specific scenarios,neglecting the key effect of frictional ice melting on their mobility and having limited applicability.In this study,a two-dimensional model combining thermodynamic and dynamic properties was proposed.This model,based on depth-averaged and granular flow theories,considers the friction weakening process to simulate the dynamics of ice avalanches.The governing equations for motion and heat transfer were solved by employing the finite volume and the Crank-Nicolson methods.The numerical simulation results showed that the friction weakening caused by the thermal effect on the sliding surface significantly reduced the friction coefficient between the ice mass and its substrate,increasing the travel distance of ice avalanches.The initial ice content in the shear band affects the friction coefficient during the viscous and Coulomb friction stages.The higher the initial ice content in the shear band,the lower the viscous resistance during the frictional heatinginduced drag reduction stage,resulting in a longer sliding distance and larger coverage area.Notably,large-scale ice avalanches exhibit a"Volume Effect"similar to other mass movements such as landslides,debris flows,and rock avalanches.Ice avalanches with larger volumes exhibit greater mobility and coverage areas.The proposed model reveals the dynamic characteristics of large-scale ice avalanches under the effect of frictional heat and offers a valuable tool for dynamic analysis and supporting disaster risk reduction strategies. 展开更多
关键词 Ice avalanches Dynamic process Simulation Friction weakening Depth-averaged theory
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