期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到7,073篇文章
< 1 2 … 250 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Influence of SiC Content on Foaming Stability,Cell Structure,and Compression Performance of SiC/Al-Based Composite Foam Prepared by Two-Step Foaming Method 认领 引用
1
作者 Huang Wenzhan Liu Tao +3 位作者 Chen Yao Wang Lucai Wu Jianguo You Xiaohong 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2026年第4期890-898,共9页
SiC/Al-based composite foams were prepared by a two-step foaming method.The influence of the SiC content and its distribution uniformity on the foaming stability,cell structure,and mechanical properties of the aluminu... SiC/Al-based composite foams were prepared by a two-step foaming method.The influence of the SiC content and its distribution uniformity on the foaming stability,cell structure,and mechanical properties of the aluminum foams was investigated.The macro/micro-features of the aluminum foams were characterized and analyzed.Results demonstrate that an appropriate increase in SiC content and the uniform distribution of SiC can improve the foaming stability,optimize the cell diameter and cell wall thickness,ameliorate the cell distribution,and enhance the hardness and compressive strength of the aluminum foams.However,either insufficient or excessive SiC leads to uneven distribution of SiC particles,which is unfavorable to foaming stability and good cell structure formation.With 6wt%SiC,both the foaming stability and cell structure of the aluminum foam reach the optimal state,resulting in the highest compressive strength and optimal energy absorption capacity. 展开更多
关键词 aluminum foam two-step foaming method foaming stability cell structure hardness compressive strength
暂未订购 下载PDF
Optical simulations of organic light-emitting diodes with non-uniform layers based on two-step domain decomposition method 认领 引用
2
作者 Linya Chen Honggang Gu +5 位作者 Xiaoke Guo Ming Xu Ting Shi Jinchuan Li Weiran Cao Shiyuan Liu 《ENGINEERING Mechanical Engineering》 SCIE CAS CSCD 2026年第2期153-167,共15页
Non-uniform layers are a common and unavoidable phenomenon in the fabrication of pixel organic light-emitting diodes(OLEDs),particularly in inkjet printing(IJP),which often exhibits pronounced coffee-ring effects.Howe... Non-uniform layers are a common and unavoidable phenomenon in the fabrication of pixel organic light-emitting diodes(OLEDs),particularly in inkjet printing(IJP),which often exhibits pronounced coffee-ring effects.However,accurately simulating these non-uniform features in pixel OLEDs remains a significant challenge for existing methods.In this work,a two-step domain decomposition method was proposed to accurately and efficiently analyze pixel OLEDs with non-uniform layers.In the first step,the whole pixel was divided into several non-overlapping regions according to the dipole radiation range,and the classical dipole radiation model combined with the scattering-matrix method was applied.In the second step,each radiation region was subdivided into uniform and nonuniform parts(quasi-uniform parts),and a modified physical model was introduced to correct the reflection coefficient,transmission coefficient,and phase difference caused by non-uniform layers.The proposed method was verified through both numerical simulations and experiments on a typical IJP OLED.The results showed excellent agreement between the simulated and experimental data,with computational efficiency improved by a factor of 182 compared with COMSOL Multiphysics®.In addition,the analysis of the Purcell effect of a single dipole in a truncated Gaussian microcavity revealed the influence of non-uniformity on the microcavity effect.It explains the physical mechanism of the optical effect caused by non-uniformity,providing a theoretical fundament for non-uniform OLED optimization and manufacturing.This method breaks through the limitations of the traditional uniform model and facilitates the optical simulation and analysis of large-area pixel OLEDs with non-uniform layers. 展开更多
关键词 organic light emitting diode two-step domain decomposition method non-uniform layer optical simulation
暂未订购 下载PDF
A novel method for screening antihyperuricemic drugs by combining aptamer sensor array,exonuclease III-DNA walker and linear discriminant analysis 认领 引用
3
作者 Shiquan Zheng Jiale Ke +6 位作者 Hanren Chen Huaze Shao Fengxin Zheng Runhui Zhang Zean Zhao Jianxin Pang Lihong Liu 《Journal of Pharmaceutical Analysis》 SCIE CAS CSCD 2026年第1期199-208,共10页
The lack of a cell-based screening method limits urate-lowering drug development.A novel method combining aptamer sensor array(ASA),exonuclease III(Exo III)-powered 3D DNA walker(DW),and linear discriminant analysis(L... The lack of a cell-based screening method limits urate-lowering drug development.A novel method combining aptamer sensor array(ASA),exonuclease III(Exo III)-powered 3D DNA walker(DW),and linear discriminant analysis(LDA)was developed for detecting uric acid(UA)in cell lysates,referred to as ASA–Exo III-DW–LDA.Three aptamers(Apts)with different affinities for UA and its structurally similar compound,xanthine(Xan),were used to design the ASA.The combination of ASA and Exo III-DW enabled the detection of UA at the picomolar level,whereas LDA was employed to differentiate UA signals from the mixed signals of UA and Xan.Significantly,Pearson correlation analysis revealed a strong correlation between our method and the 14C radioactive labeling method for urate anion exchanger 1(URAT1)inhibitors,with r=0.9880 for lesinurad and r=0.9777 for benzbromarone.Using our method,kaempferol was identified as a promising hit compound for inhibiting the URAT1,because of its low half-maximal inhibitory concentration(IC50)(18.96μM)low toxicity in mouse renal tubular epithelial cells(mTECs),and significant urate-lowering effect in hyperuricemic mice at 5 mg/kg.Overall,this method is sensitive,cost-effective and safe,offering a novel strategy for routine urate-lowering drug screening in standard laboratories. 展开更多
关键词 Cell-based screening method Urate-lowering drug DNA walker Aptamers sensor array Linear discriminant analysis
暂未订购 下载PDF
A novel asymptotic linear method for micro-pressure wave mitigation at high-speed maglev tunnel exit:A case study with various open ratios on tunnel hoods 认领 引用 被引量：10
4
作者 ZHANG Jie ZHANG Mo-lin +2 位作者 HAN Shuai LIU Tang-hong GAO Guang-jun 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第5期1955-1972,共18页
A high-speed train travelling from the open air into a narrow tunnel will cause the“sonic boom”at tunnel exit.When the maglev train’s speed reaches 600 km/h,the train-tunnel aerodynamic effect is intensified,so a n... A high-speed train travelling from the open air into a narrow tunnel will cause the“sonic boom”at tunnel exit.When the maglev train’s speed reaches 600 km/h,the train-tunnel aerodynamic effect is intensified,so a new mitigation method is urgently expected to be explored.This study proposed a novel asymptotic linear method(ALM)for micro pressure wave(MPW)mitigation to achieve a constant gradient of initial c ompression waves(ICWs),via a study with various open ratios on hoods.The properties of ICWs and MPWs under various open ratios of hoods were analyzed.The results show that as the open ratio increases,the MPW amplitude at the tunnel exit initially decreases before rising.At the open ratio of 2.28%,the slope of the ICW curve is linearly coincident with a supposed straight line in the ALM,which further reduces the MPW amplitude by 26.9%at 20 m and 20.0%at 50 m from the exit,as compared to the unvented hood.Therefore,the proposed method effectively mitigates MPW and quickly determines the upper limit of alleviation for the MPW amplitude at a fixed train-tunnel operation condition.All achievements provide a ne w potential measure for the adaptive design of tunnel hoods. 展开更多
关键词 novel asymptotic linear method high-speed maglev train micro-pressure wave tunnel hood with various open ratios
暂未订购 下载PDF
Accumulative-Error-Based Event-Triggered Control for Discrete-Time Linear Systems:A Discrete-Time Looped Functional Method 认领 引用 被引量：4
5
作者 Xian-Ming Zhang Qing-Long Han +1 位作者 Xiaohua Ge Bao-Lin Zhang 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2025年第4期683-693,共11页
This paper is concerned with event-triggered control of discrete-time systems with or without input saturation.First,an accumulative-error-based event-triggered scheme is devised for control updates.When the accumulat... This paper is concerned with event-triggered control of discrete-time systems with or without input saturation.First,an accumulative-error-based event-triggered scheme is devised for control updates.When the accumulated error between the current state and the latest control update exceeds a certain threshold,an event is triggered.Such a scheme can ensure the event-generator works at a relatively low rate rather than falls into hibernation especially after the system steps into its steady state.Second,the looped functional method for continuous-time systems is extended to discrete-time systems.By introducing an innovative looped functional that links the event-triggered scheme,some sufficient conditions for the co-design of control gain and event-triggered parameters are obtained in terms of linear matrix inequalities with a couple of tuning parameters.Then,the proposed method is applied to discrete-time systems with input saturation.As a result,both suitable control gains and event-triggered parameters are also co-designed to ensure the system trajectories converge to the region of attraction.Finally,an unstable reactor system and an inverted pendulum system are given to show the effectiveness of the proposed method. 展开更多
关键词 Discrete-time linear systems event-triggered control input saturation looped functional method
暂未订购 下载PDF
Novel adaptive IMEX two-step Runge-Kutta temporal discretization methods for unsteady flows 认领 引用
6
作者 Xueyu QIN Jian YU +2 位作者 Xin ZHANG Zhenhua JIANG Chao YAN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第8期142-153,共12页
Efficient and accurate simulation of unsteady flow presents a significant challenge that needs to be overcome in computational fluid dynamics.Temporal discretization method plays a crucial role in the simulation of un... Efficient and accurate simulation of unsteady flow presents a significant challenge that needs to be overcome in computational fluid dynamics.Temporal discretization method plays a crucial role in the simulation of unsteady flows.To enhance computational efficiency,we propose the Implicit-Explicit Two-Step Runge-Kutta(IMEX-TSRK)time-stepping discretization methods for unsteady flows,and develop a novel adaptive algorithm that correctly partitions spatial regions to apply implicit or explicit methods.The novel adaptive IMEX-TSRK schemes effectively handle the numerical stiffness of the small grid size and improve computational efficiency.Compared to implicit and explicit Runge-Kutta(RK)schemes,the IMEX-TSRK methods achieve the same order of accuracy with fewer first derivative calculations.Numerical case tests demonstrate that the IMEX-TSRK methods maintain numerical stability while enhancing computational efficiency.Specifically,in high Reynolds number flows,the computational efficiency of the IMEX-TSRK methods surpasses that of explicit RK schemes by more than one order of magnitude,and that of implicit RK schemes several times over. 展开更多
关键词 Implicit-explicit temporal methods Two-step Runge-Kutta methods Adaptive algorithm Unsteady flows Navier-Stokes equations
暂未订购 下载PDF
A high output power 340 GHz balanced frequency doubler designed based on linear optimization method 认领 引用
7
作者 LIU Zhi-Cheng ZHOU Jing-Tao +5 位作者 MENG Jin WEI Hao-Miao YANG Cheng-Yue SU Yong-Bo JIN Zhi JIA Rui 《红外与毫米波学报》 SCIE EI CAS CSCD 北大核心 2025年第2期184-191,共8页
In this paper,a linear optimization method(LOM)for the design of terahertz circuits is presented,aimed at enhancing the simulation efficacy and reducing the time of the circuit design workflow.This method enables the ... In this paper,a linear optimization method(LOM)for the design of terahertz circuits is presented,aimed at enhancing the simulation efficacy and reducing the time of the circuit design workflow.This method enables the rapid determination of optimal embedding impedance for diodes across a specific bandwidth to achieve maximum efficiency through harmonic balance simulations.By optimizing the linear matching circuit with the optimal embedding impedance,the method effectively segregates the simulation of the linear segments from the nonlinear segments in the frequency multiplier circuit,substantially improving the speed of simulations.The design of on-chip linear matching circuits adopts a modular circuit design strategy,incorporating fixed load resistors to simplify the matching challenge.Utilizing this approach,a 340 GHz frequency doubler was developed and measured.The results demonstrate that,across a bandwidth of 330 GHz to 342 GHz,the efficiency of the doubler remains above 10%,with an input power ranging from 98 mW to 141mW and an output power exceeding 13 mW.Notably,at an input power of 141 mW,a peak output power of 21.8 mW was achieved at 334 GHz,corresponding to an efficiency of 15.8%. 展开更多
关键词 linear optimization method(LOM) three-dimensional electromagnetic model(3D-EM) Harmonic impedance optimization Schottky planar diode Terahertz frequency doubler
暂未订购 下载PDF
Computational method for analytical solution with finite elements(CMAS-FE):Deriving approximate analytical solution for an isotropic homogeneous elastic medium with linear finite element method 认领 引用
8
作者 Jiajia Yue Zifeng Yuan 《Theoretical & Applied Mechanics Letters》 EI CAS CSCD 2025年第6期540-550,共11页
This study presents a novel methodology to obtain an approximate analytical solution for an isotropic homo-geneous elastic medium with displacement and traction boundary conditions.The solution is derived through solv... This study presents a novel methodology to obtain an approximate analytical solution for an isotropic homo-geneous elastic medium with displacement and traction boundary conditions.The solution is derived through solving a specific numerical problem under the scope of the linear finite element method(LFEM),so the method is termed computational method for analytical solutions with finite elements(CMAS-FE).The primary objective of the CMAS-FE is to construct analytical expressions for displacements and reaction forces at nodes,as well as for strains and stresses at elemental quadrature points,all of which are formulated as infinite series solutions of various orders of Poisson’s ratios.Like the conventional LFEM,the CMAS-FE forms global sparse linear equations,but the Young’s modulus and Poisson’s ratio remain variables(or symbols).By employing a direct inverse method to solve these symbolic linear systems,an analytical expression of the displacement field can be constructed.The CMAS-FE is validated via patch and bending tests,which demonstrate convergence with mesh and term refine-ment.Furthermore,the CMAS-FE is applied to obtain the bending stiffness of a beam structure and to estimate an approximate stress intensity factor for a straight crack within a square-shaped plate. 展开更多
关键词 CMAS-FE Finite element method Linear elastic problem Analytical solution
暂未订购 下载PDF
A Two-Step Modulus-Based Matrix Splitting Iteration Method Without Auxiliary Variables for Solving Vertical Linear Complementarity Problems 认领 引用 被引量：1
9
作者 Hua Zheng Xiaoping Lu Seakweng Vong 《Communications on Applied Mathematics and Computation》 EI 2024年第4期2475-2492,共18页
In this paper,a two-step iteration method is established which can be viewed as a generalization of the existing modulus-based methods for vertical linear complementarity problems given by He and Vong(Appl.Math.Lett.1... In this paper,a two-step iteration method is established which can be viewed as a generalization of the existing modulus-based methods for vertical linear complementarity problems given by He and Vong(Appl.Math.Lett.134:108344,2022).The convergence analysis of the proposed method is established,which can improve the existing results.Numerical examples show that the proposed method is efficient with the two-step technique. 展开更多
关键词 Vertical linear complementarity problem Modulus-based matrix splitting Two-step method
暂未订购 下载PDF
The Variants of the MGSS Methods for Complex Symmetric Linear System of Equations 认领 引用
10
作者 Changfeng Ma Xiaojuan Yu 《Communications in Mathematical Research》 CSCD 2025年第2期173-188,共16页
Recently,inspired by a modified generalized shift-splitting iteration method for complex symmetric linear systems,we propose two variants of the modified generalized shift-splitting iteration(MGSS)methods for solving ... Recently,inspired by a modified generalized shift-splitting iteration method for complex symmetric linear systems,we propose two variants of the modified generalized shift-splitting iteration(MGSS)methods for solving com-plex symmetric linear systems.One is a parameterized MGSS iteration method and the other is a modified parameterized MGSS iteration method.We prove that the proposed methods are convergent under appropriate constraints on the parameters.In addition,we also give the eigenvalue distributions of differ-ent preconditioned matrices to verify the effectiveness of the preconditioners proposed in this paper. 展开更多
关键词 Complex symmetric linear system variants of MGSS method convergence analysis
A Continuous-Time Framework of Model-Free Adaptive Control for Nonlinear Plants 认领 引用
11
作者 Hao Yu Wangjiang Li +2 位作者 Linxin Che Dawei Shi Zhongsheng Hou 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第4期966-982,共17页
Continuous-time model-free adaptive control frameworks are proposed in this paper for solving tracking problems of unknown nonlinear plants described by high-order differential equations.To tackle situations where no ... Continuous-time model-free adaptive control frameworks are proposed in this paper for solving tracking problems of unknown nonlinear plants described by high-order differential equations.To tackle situations where no form or structural information of plant models is present,the first step involves introducing continuous-time dynamic linearization techniques to create data models.Based on different ways for generating control inputs,two kinds of dynamic linearization processes for continuous-time nonlinear plants are established for the first time,where the nonlinear plants are parameterized by a time-varying linear data model.In the first dynamic linearization model(DLM),the control input is calculated by designating its derivative while the second one gives directly control inputs.Then,after acquiring different dynamic linearization models,based on traditional backstepping methods,adaptive laws are proposed to learn the timevarying parameters in DLMs and the corresponding model-free adaptive controllers are designed.The conditions on designable parameters for the proposed controllers are provided to ensure semi-global practical stabilization and arbitrarily desirable ultimate tracking accuracy.Moreover,to eliminate the effects of unknown equilibrium points on tracking accuracy,a continuoustime model-free adaptive controller with pure integral terms is proposed under the second dynamic linearization model.Finally,several practical and numerical examples are simulated to illustrate the feasibility and efficiency of the proposed results. 展开更多
关键词 Backstepping methods continuous-time systems dynamic linearization model-free adaptive control (MFAC) nonlinear systems
暂未订购 下载PDF
The order of accuracy related to the error from source approximation in the method of characteristics for purely absorbing materials in planar geometry 认领 引用
12
作者 Ji-Pu Wang Zhen-Wen Wei +5 位作者 Can Huang William Martin Brendan Kochunas Qi-Cang Shen Si-Juan Chen Martin Pilch 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第6期257-270,共14页
The method of characteristics(MoC)is a well-established tool for lattice physics calculations,offering advantages such as accurate representation of both lattice geometry and boundary conditions.The flat source(FS)app... The method of characteristics(MoC)is a well-established tool for lattice physics calculations,offering advantages such as accurate representation of both lattice geometry and boundary conditions.The flat source(FS)approximation is the most commonly used approach,whereas the linear source(LS)approximation enhances the accuracy by preserving the higherorder spatial moments of the neutron source.However,determining the order of accuracy(OoA)for spatial discretization in the MoC is challenging,particularly for the LS approximation.This complexity arises because MoC employs two spatial meshes:the fission source region(FSR)mesh and a set of characteristic rays used to integrate the transport equation over the FSR mesh.In this study,we analyzed the spatial order of accuracy of the MoC in planar geometry for both FS and LS approximations in relation to the distributed source.Our theoretical predictions are consistent with the numerical results obtained using the Method of Manufactured Solutions(MMS).The results demonstrate that the FS approximation achieves second-order accuracy,whereas the LS approximation attains fourth-order accuracy. 展开更多
关键词 Method of characteristics Order of accuracy Flat source approximation Linear source approximation Method of manufactured solutions
暂未订购 下载PDF
Prediction method for stationary crossflow instability transition in supersonic boundary layers based on multi-layer perceptron 认领 引用
13
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
暂未订购 下载PDF
Short-period dense linear array ambient noise tomography of shallow crustal structure across the Haichenghe fault zone,China 认领 引用
14
作者 Mingruo Jiao Liang Wang +9 位作者 Hongyu Ni Haiyan Wang Lanshu Bai Shuo Liu Zhihong Zhang Zhenpeng Yang Zhengdong Cui Qingshan Sun Rui Qian Mengying Li 《Earthquake Science》 CAS CSCD 2026年第2期220-234,共15页
The Haicheng region,Liaoning,China,likely hosts a conjugate fault system comprising the NW-trending Haichenghe fault and NE-trending secondary faults.On February 4,1975,at 19:36 CST,an earthquake of MS7.3 and inten... The Haicheng region,Liaoning,China,likely hosts a conjugate fault system comprising the NW-trending Haichenghe fault and NE-trending secondary faults.On February 4,1975,at 19:36 CST,an earthquake of MS7.3 and intensity(MMI)IX hit the city of Haicheng,Liaoning,China.Although deep seismic profiling was previously conducted along the Haichenghe fault,the limited horizontal resolution in the shallow part prevented the recognition of kilometer-scale anomalies.The velocity structure characteristics of the Haichenghe fault and its NE-trending conjugate faults remain unclear.Using the extended range phase shift method,the high-resolution S-wave velocity structures are obtained by deploying a long,dense linear array of 55 short-period seismometers across the fault and NE-trending conjugate faults.The array length was 32 km and inter-station spacing was approximately 600 m,facilitating the collection of approximately 22 days of continuous waveform data.Employing the Extended Range Phase Shift(ERPS)method enabled the extraction of broadband 0.2–5 s Rayleigh wave phase velocity dispersion curves.The broadband dispersion data were used for inversion of the high-resolution S-wave velocity structure to a depth of 8 km from the surface.The velocity structure characteristics and seismicity of the Haichenghe fault and NE-trending conjugate faults were analyzed and compared with nearby fault gas measurements.Results show(1)shallow S-wave velocities show a low-high-low horizontal distribution,corresponding to basin-uplift-basin topography;(2)significant velocity contrasts occur across the Haichenghe fault:its SW segment(0–17 km)exhibits high velocities consistent with Paleoproterozoic crystalline basement(Pt1),while the NE segment(17–32 km)shows low velocities related to Yanshanian intrusions(γ5)and Quaternary sediments.NE-trending conjugate faults display sharp velocity gradients marking fracture locations,with all faults being near-vertical to~8 km depth;(3)seismicity at 1–6 km depth mainly clusters in high-velocity zones;at 6–8 km depth,it concentrates beneath the Haichenghe fault in low-velocity areas and along NE-trending faults;(4)the seismic activity characteristics and fault zone width of the Haicheng he fault reflected by velocity imaging results are basically consistent with those obtained by the fault gas measurement method. 展开更多
关键词 dense linear array ambient noise tomography extended range phase shift method S-wave velocity structure Haichenghe fault
暂未订购 下载PDF
In situ stress inversion using nonlinear stress boundaries achieved by the bubbling method 认领 引用 被引量：2
15
作者 Xige Liu Chenchun Huang +3 位作者 Wancheng Zhu Joung Oh Chengguo Zhang Guangyao Si 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第3期1510-1527,共18页
Due to the heterogeneity of rock masses and the variability of in situ stress,the traditional linear inversion method is insufficiently accurate to achieve high accuracy of the in situ stress field.To address this cha... Due to the heterogeneity of rock masses and the variability of in situ stress,the traditional linear inversion method is insufficiently accurate to achieve high accuracy of the in situ stress field.To address this challenge,nonlinear stress boundaries for a numerical model are determined through regression analysis of a series of nonlinear coefficient matrices,which are derived from the bubbling method.Considering the randomness and flexibility of the bubbling method,a parametric study is conducted to determine recommended ranges for these parameters,including the standard deviation(σb)of bubble radii,the non-uniform coefficient matrix number(λ)for nonlinear stress boundaries,and the number(m)and positions of in situ stress measurement points.A model case study provides a reference for the selection of these parameters.Additionally,when the nonlinear in situ stress inversion method is employed,stress distortion inevitably occurs near model boundaries,aligning with the Saint Venant's principle.Two strategies are proposed accordingly:employing a systematic reduction of nonlinear coefficients to achieve high inversion accuracy while minimizing significant stress distortion,and excluding regions with severe stress distortion near the model edges while utilizing the central part of the model for subsequent simulations.These two strategies have been successfully implemented in the nonlinear in situ stress inversion of the Xincheng Gold Mine and have achieved higher inversion accuracy than the linear method.Specifically,the linear and nonlinear inversion methods yield root mean square errors(RMSE)of 4.15 and 3.2,and inversion relative errors(δAve)of 22.08%and 17.55%,respectively.Therefore,the nonlinear inversion method outperforms the traditional multiple linear regression method,even in the presence of a systematic reduction in the nonlinear stress boundaries. 展开更多
关键词 In situ stress field Inversion method The bubbling method Nonlinear stress boundary Multiple linear regression method
暂未订购 下载PDF
Ulam-Hyers stability of nonlinear integro-differential equations having complex fractional order 认领 引用
16
作者 Pratibha Verma Surabhi Tiwari 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2026年第2期455-479,共25页
This article discusses the two-step Adomian decomposition method for solving nonlinear integro-differential equations of complex fractional order to obtain an analytical solution using a simple algorithm.We obtain the... This article discusses the two-step Adomian decomposition method for solving nonlinear integro-differential equations of complex fractional order to obtain an analytical solution using a simple algorithm.We obtain the analytical solution using only one iteration.We find the results without using the approximation and discretization tools,which generally generate the round-off error.The obtained solution has higher accuracy than other numerical methods.We consider two examples to prove the applicability of the method and compare the results with other numerical methods.Here,we use the Caputo definition for complex fractional order operators.We provide new results such as the existence,uniqueness,and stability of the solution of the complex fractional nonlinear integro-differential equations(CF-NL-IDEs)employing the fixed point theory and Ulam-Hyers stability.Additionally,we solve examples using two popular numerical methods:the Adomian decomposition method and the modified Adomian decomposition method.We also compare the solution obtained from the proposed method and the solutions obtained from these two numerical methods.It is observed via examples that our method provides more accurate results with faster convergence for the CF-NL-IDEs. 展开更多
关键词 integro-differential equations Caputo complex fractional derivative two-step Adomian decomposition method fixed point theory Ulam-Hyers stability
暂未订购 下载PDF
A Comprehensive Survey on Control of Structured Nonlinear Systems Under Network Transmission Constraints:Advances,Prospects and Challenges 认领 引用
17
作者 Ning Li Zidong Wang +2 位作者 Lei Zou Guhui Li Weihao Song 《Artificial Intelligence Science and Engineering》 2026年第2期121-140,共20页
The control problem of nonlinear systems under network transmission constraints has become a central research topic in networked control systems(NCSs).While communication networks introduce flexibility and scalability... The control problem of nonlinear systems under network transmission constraints has become a central research topic in networked control systems(NCSs).While communication networks introduce flexibility and scalability,their inherent limitations disrupt the information conditions and structural assumptions required by traditional nonlinear control methods,thereby posing significant challenges to system stability and performance.These issues have led to extensive efforts to develop nonlinear robust control frameworks tailored for networked environments.This survey reviews the main progress in this area by examining three representative classes of nonlinear systems with distinct structural features:strict-feedback/pure-feedback systems,nonlinear systems with matched uncertainties,and feedback-linearizable systems.The specific ways in which network-induced phenomena destroy the structural premises of these control approaches are clarified,including interruptions of recursive chains in backstepping,violations of arrival and sliding conditions in sliding mode control,and distortions of state transformations in feedback linearization.The solution strategies proposed to address these challenges are then grouped and summarized according to their underlying mechanisms.Finally,key conclusions are drawn,and several potential research directions are outlined to guide future work on nonlinear control under network transmission constraints. 展开更多
关键词 nonlinear systems network transmission constraints nonlinear control methods backstepping sliding mode control feedback linearization
暂未订购 下载PDF
Linear-Time Temporal Logic in AI-Based Computational Tree Models 认领 引用
18
作者 Chen Liu 《逻辑学研究》 CSSCI 2026年第3期59-91,共33页
The integration of the Linear Temporal Logic(LTL)in AI-based computational tree models is an effective form of formal verification of Artificial Intelligence systems.But classical model checking methods do not scale b... The integration of the Linear Temporal Logic(LTL)in AI-based computational tree models is an effective form of formal verification of Artificial Intelligence systems.But classical model checking methods do not scale because of the state-space explosion.In this paper,we propose a novel data driven methodology backed by deep learning for efficient approximation of LTL model checking.The Temporal Convolutional Graph Network(TCGN)is a framework for deep learning that integrates graph neural networks with temporal logic in order to verify the behaviour of complex systems.We conduct experiments on synthetic and real-world datasets,showing that TCGN achieves an accuracy of 98%and outperforms traditional methods like NuSMV both in effectiveness instantaneous verification and efficiency.The TCGN can also achieve real time large scale AI system verification due to its strong robustness under adversarial perturbation. 展开更多
关键词 temporal convolutional graph network tcgn artificial intelligence systemsbut deep learning formal verification linear temporal logic ltl data driven methodology linear time temporal logic classical model checking methods
暂未订购 下载PDF
Solution of Nonlinear Integro Differential Equations by Two-Step Adomian Decomposition Method (TSAM) 认领 引用
19
作者 Maryam Al-Mazmumy Safa O. Almuhalbedi 《International Journal of Modern Nonlinear Theory and Application》 2016年第4期248-255,共8页
The Adomian decomposition method (ADM) can be used to solve a wide range of problems and usually gets the solution in a series form. In this paper, we propose two-step Adomian Decomposition Method (TSAM) for nonlinear... The Adomian decomposition method (ADM) can be used to solve a wide range of problems and usually gets the solution in a series form. In this paper, we propose two-step Adomian Decomposition Method (TSAM) for nonlinear integro-differential equations that will facilitate the calculations. In this modification, compared to the standard Adomian decomposition method, the size of calculations was reduced. This modification also avoids computing Adomian polynomials. Numerical results are given to show the efficiency and performance of this method. 展开更多
关键词 Adomian Decomposition Method Nonlinear Volterraintegro-Differential Equations Nonlinear Fredholmintegro-Differential Equations Two-Step
暂未订购 下载PDF
Image reconstruction based on total-variation minimization and alternating direction method in linear scan computed tomography 认领 引用 被引量：20
20
作者 张瀚铭 王林元 +3 位作者 闫镔 李磊 席晓琦 陆利忠 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第7期582-589,共8页
Linear scan computed tomography （LCT） is of great benefit to online industrial scanning and security inspection due to its characteristics of straight-line source trajectory and high scanning speed. However, in prac... Linear scan computed tomography （LCT） is of great benefit to online industrial scanning and security inspection due to its characteristics of straight-line source trajectory and high scanning speed. However, in practical applications of LCT, there are challenges to image reconstruction due to limited-angle and insufficient data. In this paper, a new reconstruction algorithm based on total-variation （TV） minimization is developed to reconstruct images from limited-angle and insufficient data in LCT. The main idea of our approach is to reformulate a TV problem as a linear equality constrained problem where the objective function is separable, and then minimize its augmented Lagrangian function by using alternating direction method （ADM） to solve subproblems. The proposed method is robust and efficient in the task of reconstruction by showing the convergence of ADM. The numerical simulations and real data reconstructions show that the proposed reconstruction method brings reasonable performance and outperforms some previous ones when applied to an LCT imaging problem. 展开更多
关键词 linear scan CT image reconstruction total variation alternating direction method
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 250 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈