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14,104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：
On well-posed local-nonlocal mixed integral model of piezoelectricity for dynamic stability and vibration analysis of piezoelectric Timoshenko nanobeams with general boundary constraints 认领 引用
1
作者 Pei ZHANG PSCHIAVONE +3 位作者 Luke ZHAO Dongbo LI Yanming REN Hai QING 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2026年第4期815-838,共24页
Existing research has shown that nonlocal piezoelectric differential models often yield inconsistent dynamic responses for nanostructures.To address this issue,the two-phase local-nonlocal integral formulation has bee... Existing research has shown that nonlocal piezoelectric differential models often yield inconsistent dynamic responses for nanostructures.To address this issue,the two-phase local-nonlocal integral formulation has been proposed and has garnered increasing scholarly attention as an effective alternative.This study presents the first implementation of this theoretically consistent and paradox-free framework to investigate the size-dependent dynamic stability and free vibration behavior in piezoelectric Timoshenko nanobeams.The generalized boundary conditions are simulated through elastic constraints incorporating both translational and rotational springs at both beam ends.Departing from conventional approaches,the present formulation simultaneously accounts for size effects in both bending deformation and axial deformation caused by external voltages via the derivation of an equivalent differential representation of the well-posed local-nonlocal integral piezoelectric model.This formulation is rigorously complemented by a complete set of constitutive constraint conditions,ensuring mathematical well-posedness.The generalized differential quadrature method(GDQM)is used to discretize the governing differential equations,enabling numerical determination of dynamic instability regions(DIRs)for various boundary configurations.Following comprehensive validation through comparative analyses,we systematically examine the influence of nonlocal parameters,static force factors,and boundary stiffness characteristics on the DIRs of the beams.Furthermore,this investigation underscores the significance of incorporating nonlocal effects into voltage-induced axial loading,addressing a critical gap in the current understanding of electromechanical coupling at nanoscale dimensions. 展开更多
关键词 two-phase nonlocal integral model piezoelectric beam dynamic stability nonlocal axial force generalized differential quadrature method(GDQM)
暂未订购 下载PDF
Shielding integral experiment of slab Zr samples based on a D–T neutron source 认领 引用
2
作者 Xin‑Yi Pan Yang‑Bo Nie +8 位作者 Shi‑Yu Zhang Yan‑Yan Ding Qi Zhao Kuo‑Zhi Xu Xiao‑Yu Wang Bei‑Bo He Hong‑Tao Cheng Xi‑Chao Ruan Jie Ren 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第7期233-247,共15页
Zirconium(Zr) and its alloys are critical materials in nuclear reactors because of their low neutron absorption cross section, high-temperature stability, and excellent corrosion resistance. The accuracy and reliabili... Zirconium(Zr) and its alloys are critical materials in nuclear reactors because of their low neutron absorption cross section, high-temperature stability, and excellent corrosion resistance. The accuracy and reliability of nuclear data evaluated for Zr isotopes are directly related to the safety and efficiency of nuclear engineering. To provide experimental data for refining Zr nuclear data, we obtained the leakage neutron time-of-flight(TOF) spectra of natural Zr samples with three thicknesses at six angles using the D–T fusion neutron source in an integral experimental setup. The experimental results were compared with simulated TOF spectra generated using the Monte Carlo N-Particle Transport Code and nuclear data libraries, including CENDL-3.2, ENDF/B-Ⅷ.0, JEFF-3.3, and JENDL-5. An analysis of the calculated-to-experimental ratios revealed the following:(1) The CENDL-3.2 library lightly underestimated elastic scattering at small angles but significantly overestimated it at larger angles and in discrete inelastic scattering ranges.(2) The ENDF/B-Ⅷ.0 library significantly underestimated the discrete inelastic scattering ranges.(3) The JEFF-3.3 library consistently overestimated the measurements in both the elastic and discrete inelastic scattering ranges.(4) The JENDL-5 library demonstrated the best agreement with the experimental data among all libraries. These results highlight the inconsistencies in existing nuclear data for Zr isotopes and emphasize the necessity for further refinement to enhance their accuracy and reliability. 展开更多
关键词 Slab Zr Leakage neutron spectra Shielding integral experiment Evaluated nuclear data
暂未订购 下载PDF
A unified fractional action integral framework for memory-dependent circuit dynamics and Josephson junctions 认领 引用
3
作者 Rami Ahmad El-Nabulsi Waranont Anukool +1 位作者 Raja Valarmathi Chinnasamy Thangaraj 《Journal of Electronic Science and Technology》 EI CAS CSCD 2026年第2期56-74,共19页
This study presents a unified framework for analyzing electric circuits and Josephson junctions using a fractional action integral that incorporates memory effects and nonlocal behavior.Unlike classical integer-order ... This study presents a unified framework for analyzing electric circuits and Josephson junctions using a fractional action integral that incorporates memory effects and nonlocal behavior.Unlike classical integer-order models,the method extends the action principle to fractional orders,leading to fractional Euler-Lagrange equations that better describe currents,voltages,and phase evolution.It is particularly effective for Josephson junctions,where tunneling currents and phase dynamics show long-term correlations and dissipation.By including fractional-order elements,the framework captures anomalous damping,power-law relaxation,and persistent memory effects in complex circuits.Using a dissipative fractional standard map,the study investigates chaos and the influence of memory on system stability.Numerical results reveal strong sensitivity to fractional parameters,including bifurcations and chaotic attractors.These findings link the classical circuit theory with fractional dynamics,offering new insights for superconducting electronics and the design of nonlinear systems. 展开更多
关键词 Chaos Electric circuits Fractional-order integral Josephson junction
暂未订购 下载PDF
A Cauchy integral formula and the related properties for inframonogenic functions valued in the Clifford algebra depending on parameters 认领 引用
4
作者 DU Xiao-jing LIANG Xiao-tong XIE Yong-hong 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2026年第2期314-327,共14页
Firstly,we obtain a Cauchy integral formula for inframonogenic functions which are solutions to the sandwich equation DfD=0 in the framework of parameter-depending Cliffordtype algebras.Secondly,the properities relati... Firstly,we obtain a Cauchy integral formula for inframonogenic functions which are solutions to the sandwich equation DfD=0 in the framework of parameter-depending Cliffordtype algebras.Secondly,the properities relating to Cauchy integral operators are discussed.Finally,the decompositions of the inframonogenic function are given. 展开更多
关键词 inframonogenic function Cauchy integral formula Clifford algebra depending on parameter
暂未订购 下载PDF
Estimates for p-adic fractional integral operator with rough kernels on grand p-adic Herz-type spaces 认领 引用
5
作者 XIA Xiaoxi ZHOU Jiang 《中山大学学报（自然科学版）（中英文）》 CAS CSCD 北大核心 2026年第2期153-159,共7页
The goal of this paper is to establish the boundedness of the p-adic fractional integral operator with rough kernel Iβ,Ω′pand its commutators generated by b∈Λγ(Qpn)(0<γ<1)and the I_(β,Ω′... The goal of this paper is to establish the boundedness of the p-adic fractional integral operator with rough kernel Iβ,Ω′pand its commutators generated by b∈Λγ(Qpn)(0<γ<1)and the Iβ,Ω′p on grand p-adic Herz spaces. 展开更多
关键词 Lipschitz spaces grand p-adic Herz spaces p-adic fractional integral operator commutators
暂未订购 下载PDF
Bilinear Fractional Integral Operators 认领 引用
6
作者 Ting Chen Wenchang Sun 《Analysis in Theory and Applications》 CSCD 2026年第1期32-61,共30页
We study the bilinear fractional integral considered by Kenig and Stein,where linear combinations of variables with matrix coefficients are involved.Under more general settings,we give a complete characterization of t... We study the bilinear fractional integral considered by Kenig and Stein,where linear combinations of variables with matrix coefficients are involved.Under more general settings,we give a complete characterization of the corresponding parameters for which the bilinear fractional integral is bounded from Lp1(Rn1)×Lp2(Rn2)to Lq(Rm). 展开更多
关键词 Bilinear fractional integrals Riesz potentials
The Wiener path integral interpretation of the 3:1 combat rule 认领 引用
7
作者 Wei Liang Ming Zhong 《Communications in Theoretical Physics》 SCIE CAS CSCD 2026年第4期138-148,共11页
The Wiener path integral framework is proposed to model military combat dynamics by incorporating the neglected stochastic effects to the Lanchester's square law.This framework is applied to evaluate the empirical... The Wiener path integral framework is proposed to model military combat dynamics by incorporating the neglected stochastic effects to the Lanchester's square law.This framework is applied to evaluate the empirical 3:1 combat rule,which posits that an attacker requires a threefold force superiority to achieve victory.Specifically,the attacker's winning probability is computed utilizing a semi-analytical Rayleigh-Ritz method.Numerical results demonstrate that the validity of the rule critically depends on specific parameter regimes,primarily contingent upon the relative combat effectiveness ratio between the opposing forces and the tolerance for attrition.This work establishes a physics-informed theoretical bridge between statistical mechanics and military operations research for analyzing uncertain combat systems. 展开更多
关键词 Wiener path integral Stochastic dynamics transition probability military conflict system Lanchester model 3:1 combat rule Brown motion
暂未订购 下载PDF
Optimal bounds for complete elliptic integral of the second kind from means 认领 引用
8
作者 LI Na SHI Yongguo 《纯粹数学与应用数学》 2026年第1期197-206,共10页
In this paper,we give the double inequalities of a special quasi-arithmetic mean E(a,b)and the Seifert-like elliptic integral mean V(a,b)under the combination of generalized Heronian mean Hw(a,b),harmonic mean H(a,b)a... In this paper,we give the double inequalities of a special quasi-arithmetic mean E(a,b)and the Seifert-like elliptic integral mean V(a,b)under the combination of generalized Heronian mean Hw(a,b),harmonic mean H(a,b)and arithmetic mean A(a,b).As applications,we obtain two new optimal bounds for the second kind of complete elliptic integral".Finally,numerical experiments are performed to compare these with some known bounds of",and the improved effect is verified. 展开更多
关键词 Means Complete elliptic integral inequality
暂未订购 下载PDF
Fatigue reliability assessment of turbine blade via direct probability integral method 认领 引用 被引量：3
9
作者 Guohai CHEN Pengfei GAO +1 位作者 Hui LI Dixiong YANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第4期305-320,共16页
Fatigue analysis of engine turbine blade is an essential issue.Due to various uncertainties during the manufacture and operation,the fatigue damage and life of turbine blade present randomness.In this study,the random... Fatigue analysis of engine turbine blade is an essential issue.Due to various uncertainties during the manufacture and operation,the fatigue damage and life of turbine blade present randomness.In this study,the randomness of structural parameters,working condition and vibration environment are considered for fatigue life predication and reliability assessment.First,the lowcycle fatigue problem is modelled as stochastic static system with random parameters,while the high-cycle fatigue problem is considered as stochastic dynamic system under random excitations.Then,to deal with the two failure modes,the novel Direct Probability Integral Method(DPIM)is proposed,which is efficient and accurate for solving stochastic static and dynamic systems.The probability density functions of accumulated damage and fatigue life of turbine blade for low-cycle and high-cycle fatigue problems are achieved,respectively.Furthermore,the time–frequency hybrid method is advanced to enhance the computational efficiency for governing equation of system.Finally,the results of typical examples demonstrate high accuracy and efficiency of the proposed method by comparison with Monte Carlo simulation and other methods.It is indicated that the DPIM is a unified method for predication of random fatigue life for low-cycle and highcycle fatigue problems.The rotational speed,density,fatigue strength coefficient,and fatigue plasticity index have a high sensitivity to fatigue reliability of engine turbine blade. 展开更多
关键词 Engine turbine blade Low-cycle fatigue High-cycle fatigue Fatigue reliability Direct probability integral method
暂未订购 下载PDF
Integral casting of Ni-based superalloy melt and Nb-pretreated SiCf/SiC composite 认领 引用 被引量：1
10
作者 Guo-biao LIN Fu-hu ZHU +2 位作者 Jing-yu LIU Peng LIU Kai-xuan CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第8期2652-2665,共14页
A practical process method for precise integration of SiCf/SiC composite(CMC)and a Ni-based superalloy(K403)was proposed in this study.It involves Nb coating pretreatment of the CMC via the chemical vapor depositio... A practical process method for precise integration of SiCf/SiC composite(CMC)and a Ni-based superalloy(K403)was proposed in this study.It involves Nb coating pretreatment of the CMC via the chemical vapor deposition(CVD)at 1000℃and subsequent integral precision casting between the pretreated CMC and the K403 superalloy melt.The method solves the difficulty for the dissimilar material to be cast together,forming a robust bonding interface with an average shear strength of 94.8 MPa at room temperature.During the pretreatment process,the Nb reacted with the CMC,forming a reactive coating with the microstructure composed of NbC,Nb2C and Nb5Si3 phases.In the following integral casting,the Nb reactive coating effectively blocked detrimental graphitization reaction between the Ni element in the superalloy melt and the CMC,and mitigated the interface thermal stress generated by both the mismatch of thermal expansion coefficients and temperature difference,resulting in the increase of interfacial strength.The typical interfacial microstructure consists of the CMC,NbC,NbSi2/NbC,SiC,NbSi2,Nb2C,Nb5Si3,Al4C3,Nb2Al/γ/γ'and MC(M=W,Mo,Ti).A formula for estimating the interfacial thermal stress of an integrated cast was derived. 展开更多
关键词 SiCf/SiC composite microstructure Ni-based superalloy integral casting Nb reactive coating bonding strength
暂未订购 下载PDF
Two-phase nonlocal integral model with bi-Helmholtz kernel for free vibration analysis of multi-walled carbon nanotubes considering size-dependent van der Waals forces 认领 引用 被引量：1
11
作者 Chang LI Rongjun CHEN +1 位作者 Cheng LI Hai QING 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2025年第11期2095-2114,共20页
Current studies on carbon nanotube (CNT) size effects predominantly employ Eringen’s differential nonlocal model, which is widely recognized as ill-suited for bounded domains. This paper investigates the free vibrati... Current studies on carbon nanotube (CNT) size effects predominantly employ Eringen’s differential nonlocal model, which is widely recognized as ill-suited for bounded domains. This paper investigates the free vibration of multi-walled CNTs (MWCNTs) with mathematically well-posed two-phase strain-driven and stress-driven nonlocal integral models incorporating the bi-Helmholtz kernel. The van der Waals (vdW) forces coupling MWCNT layers are similarly modeled as size-dependent via the bi-Helmholtz two-phase nonlocal integral framework. Critically, conventional pure strain-driven or stress-driven formulations become over-constrained when nonlocal vdW interactions are considered. The two-phase strategy resolves this limitation by enabling consistent coupling. Each bi-Helmholtz integral constitutive equation is equivalently transformed into a differential form requiring four additional constitutive boundary conditions (CBCs). The numerical solutions are obtained with the generalized differential quadrature method (GDQM) for these coupled higher-order equations. The parametric studies on double-walled CNTs (DWCNTs) and triple-walled CNTs (TWCNTs) elucidate the nonlocal effects predicted by both formulations. Additionally, the influence of nonlocal parameters within vdW forces is systematically evaluated to comprehensively characterize the size effects in MWCNTs. 展开更多
关键词 multi-walled carbon nanotube(MWCNT) two-phase nonlocal integral elasticity bi-Helmholtz kernel free vibration generalized differential quadrature method(GDQM) nonlocal van der Waals(vdW)force
暂未订购 下载PDF
Kirchhoff Integral Migration for VTI Media with Travel-Time Calculated Based on PINN 认领 引用
12
作者 XU Bowen SONG Peng +7 位作者 CAO Yanling WANG Ruxi FENG Qiwei LIU Qianran JING Lu ZHAO Bo XU Yongchen TIAN Mingyang 《Journal of Ocean University of China》 SCIE CAS CSCD 2025年第4期954-966,共13页
Kirchhoff integral migration imaging is widely used in industrial production due to its advantages of not being limited by observation systems,good target imaging effects,and high computational efficiency.Vertical tra... Kirchhoff integral migration imaging is widely used in industrial production due to its advantages of not being limited by observation systems,good target imaging effects,and high computational efficiency.Vertical transversely isotropic(VTI)media,as a typical anisotropic media,has always been a primary focus of anisotropic migration imaging research.We focus on the problems of low accuracy and efficiency in travel-time calculations associated with conventional Kirchhoff integral migration for VTI media.A travel-time calculation method based on physical-informed neural network(PINN)for VTI media is introduced into the process of Kirchhoff integral migration imaging.Model experiments and field data processing have shown that the travel-time calculation based on PINN can significantly improve both the accuracy and efficiency when compared to traditional finite difference algorithms,there-by enabling high-precision Kirchhoff integral migration imaging for VTI media. 展开更多
关键词 Kirchhoff integral migration VTI media travel-time calculation physical-informed neural network
暂未订购 下载PDF
A shielding integral experiment with different thickness of slab9Be samples based on deuterium-tritium neutron source 认领 引用
13
作者 Shi-Yu Zhang Yang-Bo Nie +10 位作者 Qi Zhao Xin-Yi Pan Yan-Yan Ding Kuo-Zhi Xu Xiao-Yu Wang Bei-Bo He Qi Sun Jie Ren Hong-Tao Chen Xi-Chao Ruan Zheng Wei 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2025年第11期327-345,共19页
Beryllium(9Be)serves as a crucial neutron multiplier and reflection material,being extensively employed in the nuclear industry.The evaluated nuclear data are utilized in the design of the nuclear devices.Following... Beryllium(9Be)serves as a crucial neutron multiplier and reflection material,being extensively employed in the nuclear industry.The evaluated nuclear data are utilized in the design of the nuclear devices.Following the interaction between neutrons and9Be,all neutrons generated stem from the9Be(n,2n)8Be reaction channel,except for the elastic scattering reaction channel.Nevertheless,the data of the outgoing neutron double differential cross section of the reaction channel provided by the latest internationally evaluated libraries still exhibit considerable discrepancies.A shielding integral experiment based on slab9Be samples with measurements of neutron spectra leaked from different angles is an effective approach to verify the double differential cross-section data.Hence,in this study,a shielding integral experiment of9Be samples of different thicknesses was conducted using a nanosecond pulsed deuterium-tritium neutron source established by the China Institute of Atomic Energy.The neutron time-of-flight spectra of three thicknesses(4.4 cm,8.8 cm,and 13.2 cm)and six angles(47°,58°,73°,107°,122°,and 133°)were measured by the neutron time-of-flight method,and 18 sets of experimental data were obtained.Additionally,the MCNP-4C program was used to obtain the simulated results of the leakage neutron spectra using the evaluated nuclear data of9Be from the CENDL-3.2,ENDF/B-Ⅷ.0,JENDL-5,and JEFF-3.3 libraries.The simulated results of the leakage neutron spectra were compared with the experimental results,and the results showed that in the elastic scattering energy region,the simulated results from the CENDL-3.2,ENDF/B-Ⅷ.0,and JENDL-5 libraries were slightly higher at small angles and slightly lower at large angles.In the(n,2n)energy region,the simulated results from the CENDL-3.2 library were significantly different from the experimental results in terms of spectral shape,and the simulated results from the ENDF/B-Ⅷ.0 and the JENDL-5 libraries were in good agreement with the experimental results at small angles but low at large angles.The simulated results from the JEFF-3.3 library showed serious underestimation at all angles. 展开更多
关键词 Beryllium Evaluated nuclear data Shielding integral experiment Deuterium tritium neutron source Neutron time-of flight spectrum MCNP-4C program
暂未订购 下载PDF
Integral experiment on slabnatPb using D-T and D-D neutron sources to validate evaluated nuclear data 认领 引用
14
作者 Kuo-Zhi Xu Yang-Bo Nie +6 位作者 Chang-Lin Lan Yan-Yan Ding Shi-Yu Zhang Qi Zhao Xin-Yi Pan Jie Ren Xi-Chao Ruan 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2025年第3期119-133,共15页
Lead(Pb)plays a significant role in the nuclear industry and is extensively used in radiation shielding,radiation protection,neutron moderation,radiation measurements,and various other critical functions.Consequently,... Lead(Pb)plays a significant role in the nuclear industry and is extensively used in radiation shielding,radiation protection,neutron moderation,radiation measurements,and various other critical functions.Consequently,the measurement and evaluation of Pb nuclear data are highly regarded in nuclear scientific research,emphasizing its crucial role in the field.Using the time-of-flight(ToF)method,the neutron leakage spectra from threenatPb samples were measured at 60°and 120°based on the neutronics integral experimental facility at the China Institute of Atomic Energy(CIAE).ThenatPb sample sizes were30 cm×30 cm×5 cm,30 cm×30 cm×10 cm,and 30 cm×30 cm×15 cm.Neutron sources were generated by the Cockcroft-Walton accelerator,producing approximately 14.5 MeV and 3.5 MeV neutrons through the T(d,n)4He and D(d,n)3He reactions,respectively.Leakage neutron spectra were also calculated by employing the Monte Carlo code of MCNP-4C,and the nuclear data of Pb isotopes from four libraries:CENDL-3.2,JEFF-3.3,JENDL-5,and ENDF/B-Ⅷ.0 were used individually.By comparing the simulation and experimental results,improvements and deficiencies in the evaluated nuclear data of the Pb isotopes were analyzed.Most of the calculated results were consistent with the experimental results;however,a few areas did not fit well.In the(n,el)energy range,the simulated results from CENDL-3.2 were significantly overestimated;in the(n,inl)D and the(n,inl)C energy regions,the results from CENDL-3.2 and ENDF/B-Ⅷ.0 were significantly overestimated at 120°,and the results from JENDL-5 and JEFF-3.3 are underestimated at 60°in the(n,inl)D energy region.The calculated spectra were analyzed by comparing them with the experimental spectra in terms of the neutron spectrum shape and C/E values.The results indicate that the theoretical simulations,using different data libraries,overestimated or underestimated the measured values in certain energy ranges.Secondary neutron energies and angular distributions in the data files have been presented to explain these discrepancies. 展开更多
关键词 Integral experiment Neutron leakage spectra natPb D-T and D-D neutron sources Evaluated nuclear data
暂未订购 下载PDF
Data-based neural controls for an unknown continuous-time multi-input system with integral reinforcement 认领 引用
15
作者 Yongfeng Lv Jun Zhao +1 位作者 Wan Zhang Huimin Chang 《Control Theory and Technology》 EI CSCD 2025年第1期118-130,共13页
Integral reinforcement learning(IRL)is an effective tool for solving optimal control problems of nonlinear systems,and it has been widely utilized in optimal controller design for solving discrete-time nonlinearity.Ho... Integral reinforcement learning(IRL)is an effective tool for solving optimal control problems of nonlinear systems,and it has been widely utilized in optimal controller design for solving discrete-time nonlinearity.However,solving the Hamilton-Jacobi-Bellman(HJB)equations for nonlinear systems requires precise and complicated dynamics.Moreover,the research and application of IRL in continuous-time(CT)systems must be further improved.To develop the IRL of a CT nonlinear system,a data-based adaptive neural dynamic programming(ANDP)method is proposed to investigate the optimal control problem of uncertain CT multi-input systems such that the knowledge of the dynamics in the HJB equation is unnecessary.First,the multi-input model is approximated using a neural network(NN),which can be utilized to design an integral reinforcement signal.Subsequently,two criterion networks and one action network are constructed based on the integral reinforcement signal.A nonzero-sum Nash equilibrium can be reached by learning the optimal strategies of the multi-input model.In this scheme,the NN weights are constantly updated using an adaptive algorithm.The weight convergence and the system stability are analyzed in detail.The optimal control problem of a multi-input nonlinear CT system is effectively solved using the ANDP scheme,and the results are verified by a simulation study. 展开更多
关键词 Adaptive dynamic programming Integral reinforcement Neural networks Heuristic dynamic programming Multi-input system
A methodology of Lagrangian integral time scale in cavitating flow based on finite-time Lyapunov exponent 认领 引用
16
作者 Peifeng LIN Tianyu ZANG Jinming ZHANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2025年第12期2407-2426,共20页
The Lagrangian integral time scale(LITS)is a crucial characteristic for investigating the changes in fluid dynamics induced by the chaotic nature,and the finitetime Lyapunov exponent(FTLE)serves as a key measure in th... The Lagrangian integral time scale(LITS)is a crucial characteristic for investigating the changes in fluid dynamics induced by the chaotic nature,and the finitetime Lyapunov exponent(FTLE)serves as a key measure in the analysis of chaos.In this study,a new LITS model with an explicit theoretical basis and broad applicability is proposed based on the FTLE,along with a verification and evaluation criterion grounded in the Lagrangian velocity correlation coefficient.The model is used to cavitating the flow around a Clark-Y hydrofoil,and the LITS is investigated.It leads to the determination of model constants applicable to cavitating flow.The model is evaluated by the Lagrangian velocity correlation coefficient in comparison with other solution methods.All the results show that the LITS model can offer a new perspective and a new approach for studying the changes in fluid dynamics from a Lagrangian viewpoint. 展开更多
关键词 Lagrangian integral time scale(LITS) finite-time Lyapunov exponent(FTLE) cavitating flow correlation coefficient fluid dynamics
暂未订购 下载PDF
LADRC method referring to the integral chain model:design of dual-loop disturbance compensation and engineering verification 认领 引用
17
作者 Yao Qin Hailin Hu Jie Yang 《Control Theory and Technology》 EI CSCD 2025年第3期364-377,共14页
To address the issue of disturbance compensation deviation in linear active disturbance rejection control(LADRC),a linear active disturbance rejection control method with reference to the integral chain model(LADRC-R)... To address the issue of disturbance compensation deviation in linear active disturbance rejection control(LADRC),a linear active disturbance rejection control method with reference to the integral chain model(LADRC-R)is proposed.By constructing an ideal control reference model,a dynamic correlation between output deviation and uncompensated disturbances is established,and a dual-loop compensation mechanism is designed.Based on theoretical analysis and frequency-domain characteristics of typical first/second-order systems,this method maintains the parameter-tuning advantages of LADRC while reducing disturbance effects by 50%and introducing no phase lag during low-frequency disturbance suppression.Simulations on second-order systems verify its robustness under parameter perturbations,gain mismatch,and complex disturbances,and an optimized design scheme for the deviation compensator is proposed to suppress discontinuous measurement noise interference.Finally,the engineering effectiveness of this method in precision motion control is validated on an electromagnetic suspension platform,providing a new approach to improving the control performance of LADRC in environments with uncertain disturbances. 展开更多
关键词 Linear active disturbance rejection control Disturbance compensation deviation Referring to integral chain model Dual-loop compensation Robustness
A Proportional Integral Controller-Enhanced Non-Negative Latent Factor Analysis Model 认领 引用
18
作者 Ye Yuan Siyang Lu Xin Luo 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2025年第6期1246-1259,共14页
A non-negative latent factor(NLF)model is able to be built efficiently via a single latent factor-dependent,non-negative and multiplicative update(SLF-NMU)algorithm for performing precise representation to high-dimens... A non-negative latent factor(NLF)model is able to be built efficiently via a single latent factor-dependent,non-negative and multiplicative update(SLF-NMU)algorithm for performing precise representation to high-dimensional and incomplete(HDI)matrix from many kinds of big-data-related applications.However,an SLF-NMU algorithm updates a latent factor relying on the current update increment only without considering past learning information,making a resultant model suffer from slow convergence.To address this issue,this study proposes a proportional integral(PI)controller-enhanced NLF(PI-NLF)model with two-fold ideas:1)Designing an increment refinement(IR)mechanism,which formulates the current and past update increments as the proportional and integral terms of a PI controller,thereby assimilating the past update information into the learning scheme smoothly with high efficiency;2)Deriving an IR-based SLF-NMU(ISN)algorithm,which updates a latent factor following the principle of an IR mechanism,thus significantly accelerating an NLF model's convergence rate.The simulation results on eight HDI matrices collected by real applications validate that a PI-NLF model outstrips several leading-edge models in both computational efficiency and accuracy when estimating missing data within an HDI matrix.The proposed PI-NLF model can be effectively applied to applications involving HDI matrix like e-commerce system,social network,and cloud service system.The code is available at http://gffzz188fe103f8f1460asqnfnk9bwbf696knw.ffgz.tsg.suse.edu.cn/yuanyeswu/PINLF/blob/mainIPINLF-code.zip. 展开更多
关键词 High-dimensional and incomplete(HDI)data learning algorithm non-negative latent factor(NLF)analysis proportional integral(PI)controller
暂未订购 下载PDF
AN EXTENSION OF MARCINKIEWICZ INTEGRALS WITH ROUGH KERNELS 认领 引用
19
作者 Huoxiong WU Lin WU 《Acta Mathematica Scientia》 SCIE CSCD 2025年第3期789-808,共20页
This paper considers the following Marcinkiewicz type integrals■which can be regarded as an extension of the classical Marcinkiewicz integral po introduced by Stein in[Trans Amer Math Soc,88(1958):159-172],where Ω i... This paper considers the following Marcinkiewicz type integrals■which can be regarded as an extension of the classical Marcinkiewicz integral po introduced by Stein in[Trans Amer Math Soc,88(1958):159-172],where Ω is a homogeneous function of degree zero on Rnwith mean value zero in the unit sphere Sn-1,Under the assumption that Ω∈L∞(Sn-1),the authors establish the Lq-estimate and weak(1,1)type estimate as well as the corresponding weighted estimates for po.s with 1<q<∞ and 0<β(q-1)n/q.Moreover,the bounds do not depend on β and the strong(q,q)type and weak(1,1)type estimates for the classical Marcinkiewicz integral po can be recovered from the above estimates of μΩ,β whenβ→0. 展开更多
关键词 Marcinkiewicz integral rough kernel uniform estimates Apweight
暂未订购 下载PDF
Extension of Integral of First Passage Times Towards Multi-Point Polymer Adsorption 认领 引用
20
作者 Yifan Huang Qiyun Tang 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2025年第6期845-854,I0238,共10页
We present a comprehensive extension of the integral of first passage times(IFS)method to investigate the adsorption kinetics of polymers with multiple binding sites on planar surfaces.While effective for single-point... We present a comprehensive extension of the integral of first passage times(IFS)method to investigate the adsorption kinetics of polymers with multiple binding sites on planar surfaces.While effective for single-point adsorption,the original IFS method was limited in capturing the complex kinetics of multi-point adsorption due to inadequate reaction coordinates and theoretical frameworks.Our approach introduces a center-of-mass-based reaction coordinate and a generalized kinetic model that accounts for multi-barrier free energy landscapes characteristic of collective polymer diffusion and binding.This theoretical advancement,implemented using the adaptive bias force method for efficient sampling,enables prediction of adsorption kinetics across timescales from nanoseconds to seconds.Our results demonstrate that adsorption behavior is governed by two key factors:the number of binding monomers primarily controls desorption barriers and long-term stability,while the configuration of pre-adsorbed layers significantly modulates both adsorption and desorption rates.Polymers with three or more binding sites exhibit effectively irreversible adsorption due to exponentially increasing desorption barriers,whereas different adsorbed layer configurations lead to distinct equilibrium coverages and kinetic profiles.This extended IFS framework provides critical insights for designing functional surfaces in nanoscale sensing,macromolecular recognition,and tailored polymeric coatings where precise control over adsorption kinetics is essential. 展开更多
关键词 Polymer Adsorption kinetics Integral of first passage times Molecular dynamics simulation
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