Results 61 to 70 of about 9,063 (254)

Efficiency and Stability of a New Hybrid Unconstrained Optimization Algorithm with Quasi-Newton Updates and Higher-Order Methods

Mathematics
We propose the higher-order quasi-Newton (HOQN) method, a hybrid algorithm for unconstrained optimization that combines Newtonian predictors with higher-order correctors derived from vector extensions of the Traub, Chun, and Ostrowski methods, along with
Alicia Cordero, Javier G. Maimó, Juan R. Torregrosa, Natanael Ureña Castillo   +3 more
doaj   +1 more source

A numerical solution of parabolic quasi-variational inequality nonlinear using Newton-multigrid method [PDF]

Iranian Journal of Numerical Analysis and Optimization
In this article, we apply three numerical methods to study the L∞-convergence of the Newton-multigrid method for parabolic quasi-variational inequalities with a nonlinear right-hand side.
M. Bahi, M. Beggas, N. Nesba, A. Imtiaz
doaj   +1 more source

A Reversible Clearing Strategy Enables Robust Label‐Free Phase Imaging of Thick Tissues

Laser &Photonics Reviews, EarlyView.
The principle of a reversible clearing strategy via glycerol and tartrazine solution (GTS) for robust whole‐slide label‐free phase imaging of thick tissue slices via high‐throughput Fourier ptychographic microscopy (FPM) and lensless digital holographic microscopy (LDHM). ABSTRACT Thick biological specimens impose strong scattering and attenuation that
Mikołaj Krysa, Anna Chwastowicz, Małgorzata Lenarcik, Paweł Matryba, Piotr Zdańkowski, Maciej Trusiak   +5 more
wiley   +1 more source

Spatially Uniform and Defect‐Tolerant Plasmonic Responses in 3D Printed Gold Nanoparticle Assemblies

Laser &Photonics Reviews, EarlyView.
We introduce 3D nanoprinting of gold nanoparticle assemblies and show that their broad optical responses remain reproducible despite structural disorder. This robustness is attributed to ensemble‐averaged plasmonic responses from many local coupling regions.
Vasanthan Devaraj, Sunghyun Kwak, Hyeongjip Kim, Sang‐Keun Sung, Jong‐Min Lee, Thomas Zentgraf, Won‐Geun Kim   +6 more
wiley   +1 more source

Fatigue Life Prediction of Coiled Tubing Based on Optimized BP Neural Network

Shiyou jixie, 2023
When the standard BP neural network is used to predict the fatigue life of coiled tubing,local minimum is easily fallen into and training time is too long.To solve these problems,the momental gradient descent method,quasi-Newton algorithm and one-step ...
Dou Yihua, Zhang Jiaqiang, Li Guoliang, Wei Liang, Cao Yinping   +4 more
doaj  

Impact and Compressive Performance of 3D‐Printed PA6/Functionalized Graphene Nanoplatelet Sandwich Structures With Auxetic Cores

Polymer Composites, EarlyView.
Schematic of PA6/functionalized graphene nanoplatelet compounding and filament extrusion to 3D printing, sandwich panel fabrication, and mechanical characterization. ABSTRACT This study examines the impact and compressive behavior of additively manufactured polyamide 6 (PA6) nanocomposite sandwich panels reinforced with amine‐functionalized graphene ...
Russo Swart, Karim El‐Ghamrawy, Richard Johnston, Feras Korkees   +3 more
wiley   +1 more source

Solids Conveying in Injection Molding Machines—Analytical Model for Smooth and Grooved Feed Sections Derived From DEM Simulations

Polymer Engineering &Science, EarlyView.
Understanding Solids Conveying in Injection Molding Machines – Dimensions. ABSTRACT Solids conveying is a key aspect for the design of polymer processing machines, especially for processes with high screw speeds, grooved feed sections, and material with low bulk density.
Jan Landgraeber, Volker Schoeppner, Dennis Kleinschmidt, Dominik Jonek, Nils Grieger   +4 more
wiley   +1 more source

Forward Kinematics Analysis of 2RUS/RRS Parallel Mechanism

Jixie chuandong, 2018
The iterative search method（ Newton or Quasi-Newton） is an important numerical method for solving the forward kinematics（ FK） problem of parallel mechanisms. Due to the extremely displacement singularity in the limbs,the search space is easy to be out of
Geng Mingchao, Bian Hui, Zhang Canguo, Li Xin   +3 more
doaj  

Sonified Signals From a Compact FT‐ICR Instrument: A Feasibility Study. I—Data Mapping to an Equal‐Tempered Chromatic Scale

Rapid Communications in Mass Spectrometry, EarlyView.
ABSTRACT Rationale Ions trapped within a Penning cell (ICR) travel periodic orbits whose frequencies are dependent on their mass‐to‐charge ratio and the value of the magnetic field passing through the trap. Fourier transformation (FT‐ICR) decomposes the signal induced in the detection circuit by the rotation of the ions in the cell after the ...
Patrick Arpino, Michel Heninger
wiley   +1 more source

A Family of Newton and Quasi-Newton Methods for Power Flow Analysis in Bipolar Direct Current Networks with Constant Power Loads

Mathematical and Computational Applications
This paper presents a comprehensive study on the formulation and solution of the power flow problem in bipolar direct current (DC) distribution networks with unbalanced constant power loads.
Oscar Danilo Montoya, Juan Diego Pulgarín Rivera, Luis Fernando Grisales-Noreña, Walter Gil-González, Fabio Andrade-Rengifo   +4 more
doaj   +1 more source