Results 51 to 60 of about 119 (119)

Second‐Law Analysis of Mini/Micro Counterflow Parallel‐Plate Heat Exchangers: Optimizing Effectiveness by Minimizing Wall Entropy Production

Heat Transfer, EarlyView.
ABSTRACT We present an analytical and numerical study of the entropy production rate in laminar counterflow parallel‐plate heat exchangers, aiming to investigate the interplay between multidimensional wall conduction, entropy production, and the optimum wall conductivity that leads to maximum effectiveness.
Santiago E. Ibáñez, Alberto E. Quintero, Marcos Vera   +2 more
wiley   +1 more source

Noncausal AR‐ARCH Model and Its Applications to Financial Time Series

International Journal of Finance &Economics, EarlyView.
ABSTRACT We extend the noncausal autoregressive models by introducing noncausality into the variance component, allowing the volatility to depend on future prices as well. We refer to this model as the noncausal AR‐ARCH model, and it enables us to account for shocks arising from market agents who possess more information and engage in forward‐looking ...
Yaosong Zhan, Shiqing Ling, Zhenya Liu, Shixuan Wang   +3 more
wiley   +1 more source

Dynamics of Vector Soliton Singlets and Pairs in Self‐Mode‐Locked Tm‐Doped Fibre Lasers

Laser &Photonics Reviews, EarlyView.
This study characterises soliton build‐up dynamics in a self‐mode‐locked Tm‐doped fibre laser, where both cavity birefringence and distributed saturable absorber play significant roles in the intracavity pulse shaping. The recorded single‐shot spectra using the dispersive Fourier transform technique reveal intensity‐dependent temporal splitting of ...
Dennis C. Kirsch, Anastasia Bednyakova, Maria Chernysheva   +2 more
wiley   +1 more source

Reversal Asymmetry of Reciprocal Metasurface Enables Ultra‐Compact Varifocal Reflective Lens

Laser &Photonics Reviews, EarlyView.
The possibility of breaking the reversal symmetry of a lens without violating reciprocity is demonstrated. The freedom provided is utilized to realize an ultra‐compact reflective varifocal lens‐doublet based on a flat metasurface lens and a piezoelectric actuated micromirror.
Christopher A. Dirdal, Jesil Jose, Firehun Tsige Dullo, Grégory Bouquet, Paul C. V. Thrane, Zeljko Skokic, Johannes Skaar   +6 more
wiley   +1 more source

Aging of Tetrafluoroethylene Propylene (FEPM) Material in High‐Pressure HighTemperature Hydrogen Sulfide Downhole Environment: Theory, Modeling, Experiments, and Material Lifetime Prediction

Macromolecular Theory and Simulations, EarlyView.
A novel approach that integrates AI‐based methodology, laboratory experimentation, and field application experience to accurately predict the lifespan of elastomeric materials in harsh downhole environments. ABSTRACT This paper presents a physics‐driven neural network (PINN) model to capture the constitutive behavior, elongation at break (EAB), modulus,
Aref Ghaderi, Hadis Nouri, Roozbeh Dargazany, Scott Meng, Peixiang Xing, Jiaxiang Ren, Peng Cheng   +6 more
wiley   +1 more source

A Variational Formulation of European Option Prices in the 1‐Hypergeometric Stochastic Volatility Model

Mathematical Methods in the Applied Sciences, EarlyView.
ABSTRACT The paper proposes a variational analysis of the 1‐hypergeometric stochastic volatility model for pricing European options. The methodology involves the derivation of estimates of the weak solution in a weighted Sobolev space. The weight is closely related to the stochastic volatility dynamic of the model.
José Da Fonseca, Wenjun Zhang
wiley   +1 more source

Neohypoplasticity for Sand Coupled With the Generalized Intergranular Strain Concept

International Journal for Numerical and Analytical Methods in Geomechanics, EarlyView.
ABSTRACT This work presents the coupling of the recently revisited advanced hypoplastic constitutive sand model called neohypoplasticity (NHP) with the more recently introduced concept of the generalized intergranular strain (GIS) to account for soil behavior due to small strains. The latter is essential for the simulation of cyclic deformations.
Luis Mugele, Hans Henning Stutz, David Mašín   +2 more
wiley   +1 more source

Interplay Between Spin‐Triplet Pairing and Ferromagnetism in Uranium Ditelluride

Nano Select, EarlyView.
This study investigates how spin triplet superconductivity and ferromagnetism interact in uranium ditelluride (UTe2). It shows that magnetic fluctuations strongly influence the superconducting behavior. The results suggest that ferromagnetic tendencies can contribute to the stabilization of spin triplet pairing. These findings provide new insights into
Habtamu Anagaw Muluneh, Gebregziabher Kahsay Hailemariam, Tamiru Negussie Wondim   +2 more
wiley   +1 more source

Effect of Magnetic Field and Temperature on the Excess Minority Carrier Density in the Base of a Radial Junction Solar Cell

Nano Select, EarlyView.
This study explores how magnetic field and temperature influence excess minority carrier density in a radial‐junction silicon solar cell. Using an analytical model based on Bessel functions, key trends are revealed, including thermal insensitivity in a specific magnetic field range.
Moussa Ouedraogo, Nazé Yacouba Traore, Alain Diasso, Raguilignaba Sam, François Zougmore   +4 more
wiley   +1 more source

Advanced Modeling of Thermo‐Mechanical Behavior in Tetrachiral Core Sandwich Nanoplates Using Non‐Local Higher‐Order Theory

Natural Sciences, EarlyView.
The study presented investigates the thermo‐mechanical behavior of a sandwich structure with a tetrachiral‐shaped auxetic core. The geometric configuration, unit cell architecture, and the influence of the material length scale on the effective stiffness under temperature variation are illustrated.
Mustafa Buğday
wiley   +1 more source