Results 81 to 90 of about 2,874 (281)

Integrating Oscillatory General Second-Order Initial Value Problems Using a Block Hybrid Method of Order 11

Mathematical Problems in Engineering, 2018
In some cases, high-order methods are known to provide greater accuracy with larger step-sizes than lower order methods. Hence, in this paper, we present a Block Hybrid Method (BHM) of order 11 for directly solving systems of general second-order initial value problems (IVPs), including Hamiltonian systems and partial differential equations (PDEs ...
Samuel N. Jator, Kindyl L. King
openaire   +2 more sources

Does Long‐Term Lower Extremity Strength Training in Adults With Knee Osteoarthritis and Varus Alignment Reduce Knee Joint Loading During Gait?

Arthritis Care &Research, EarlyView.
Objective We examined whether 18 months of strength training in individuals with knee varus alignment and medial tibiofemoral osteoarthritis (OA) reduced knee joint loads during walking compared to an attention control group. Methods This study was a secondary analysis of a randomized clinical trial that compared the effects of strength training to a ...
Stephen P. Messier, Matthew N. Vigliotti, Paige E. Rice, Brian Pietrosimone, Shannon L. Mihalko, Edward H. Ip, Richard F. Loeser, David J. Hunter, Ali Guermazi, Ryan Hill, Santiago Saldana, Kim L. Bennell, Paul DeVita   +12 more
wiley   +1 more source

Control strategy for PV inverter under unbalanced grid voltage

Dianzi Jishu Yingyong, 2018
To enhance the operation performance of the PV inverter under unbalanced grid voltage, this paper proposes a control strategy, which is based on negative sequence voltage feed forward, to make the output current of the inverter balanced and sinusoidal ...
Ouyang Sen, Ma Wenjie
doaj   +1 more source

Observer‐Based Adaptive Event‐Triggered Tracking Control for Fuzzy TS Systems With Premise Mismatch

International Journal of Adaptive Control and Signal Processing, EarlyView.
This paper presents an adaptive logistic event‐triggered observer‐based tracking controller for Takagi‐Sugeno fuzzy systems under constrained inputs and network delays. Leveraging a hybrid LMI and Secretary Bird Optimization approach, this strategy significantly minimizes communication overhead and computational burden while ensuring optimal reference ...
Oussama Djadane, Salama Makni, Mourad Kchaou, Ahmed El Hajjaji   +3 more
wiley   +1 more source

A Low-Latency, High-Accuracy Second-Order Generalized Integrator-Based Synchrophasor Estimation Method for P-Class PMU

IEEE Access
Phasor measurement units (PMUs) that are protection-oriented (P-class) must achieve a balance between superb precision of measurements and minimal latency in order to promptly identify any unusual power system operation circumstances.
Md. Maidul Islam, Md. Shamim Reza, Md. Aynal Haque   +2 more
doaj   +1 more source

Circulating Current Suppression Method of Modular Multilevel Converter Based on SOGI Under Unbalanced Grid Conditions

工程科学与技术, 2023
The design and analysis of modular multilevel converter (MMC) is usually carried out under the condition of power grid balance, but the AC power grid is unbalanced in actual operation.
Shiding ZHOU, Shunliang WANG, Yingmin ZHANG, Junpeng MA, Lin FENG, Peng SHAN   +5 more
doaj  

Characterization of Defect Distribution in an Additively Manufactured AlSi10Mg as a Function of Processing Parameters and Correlations with Extreme Value Statistics

Advanced Engineering Materials, EarlyView.
Predicting extreme defects in additive manufacturing remains a key challenge limiting its structural reliability. This study proposes a statistical framework that integrates Extreme Value Theory with advanced process indicators to explore defect–process relationships and improve the estimation of critical defect sizes. The approach provides a basis for
Muhammad Muteeb Butt, Varma Kvvssn, Hossein Laieghi, Zia Uddin, Peyman Ansari, E. Kıvanç Sadak, Can Barış Toprak, Hüseyin Kızıl, Enrico Salvati   +8 more
wiley   +1 more source

Asymptotic Expansion and Generalized Schläfli Integral Representation for the Eigenfunction of a Singular Second-Order Differential Operator

Journal of Mathematical Analysis and Applications, 1998
This paper considers second-order differential equations of the form \[ u''- [(\alpha^2- \textstyle{{1\over 4}})t^{-2}- \lambda^2- \chi(t)]u(t)= 0,\tag{\(*\)} \] which are related with Bessel, Legendre, Gegenbauer and Whittaker functions and the elementary spherical functions of noncompact Riemannian symmetric spaces of rank one.
Lazhari, M.N, Rachdi, L.T, Trimèche, K
openaire   +3 more sources

Rafting of Ni‐Based Superalloys Under Multiaxial Load as Understood by Phase‐Field Simulations and Critical Experiments

Advanced Engineering Materials, EarlyView.
Phase‐field simulations coupled with dislocation‐density‐based crystal plasticity modeling reproduce γ′ rafting behavior in single‐crystal Ni‐based superalloys under varied loading conditions. The model captures both macroscopic creep and microscopic morphology evolution, with results matching high‐temperature creep experiments.
Micheal Younan, David Bürger, Gunther Eggeler, Oleg Shchyglo, Ingo Steinbach, Muhammad Adil Ali   +5 more
wiley   +1 more source

Generalized Filippov solutions for systems with prescribed-time convergence

, 2023
Dynamical systems with prescribed-time convergence sometimes feature a right-hand side exhibiting a singularity at the prescribed convergence time instant.
Seeber, Richard
core   +2 more sources