Results 131 to 140 of about 6,390,993 (306)

An inverse problem in a parabolic equation

Electronic Journal of Differential Equations, 1998
In this paper, an inverse problem in a parabolic equation is studied. An unknown function in the equation is related to two integral equations in terms of heat kernel. One of the integral equations is well-posed while another is ill-posed.
Zhilin Li, Kewang Zheng
doaj  

Ill-Posed Inverse Problem Solving Using Two Methods of Choosing of Regularization Parameter

Ill-posed inverse problem solving using two methods of choosing of regularization ...
Zorina, Natalia, Skudra, Atis, Rēvalde, Gita   +2 more
core  

Conformal Reconfigurable Intelligent Surfaces: A Cylindrical Geometry Perspective

Advanced Electronic Materials, EarlyView.
Cylindrical reconfigurable intelligent surfaces are explored for low‐complexity beam steering using one‐bit meta‐atoms. A multi‐level modeling approach, including optimization‐based synthesis, demonstrates that even minimal hardware can support directive scattering.
Filippo Pepe, Ivan Iudice, Giuseppe Castaldi, Marco Di Renzo, Vincenzo Galdi   +4 more
wiley   +1 more source

Updatable Closed‐Form Evaluation of Arbitrarily Complex Multiport Network Connections

Advanced Electronic Materials, EarlyView.
The inverse design of electrically large wave devices often uses reduced‐order multiport models with discrete optimization, requiring many evaluations of complex interconnections between subsystems that differ only in a few blocks. This paper introduces a closed‐form framework enabling efficient Woodbury low‐rank updates of related, previous ...
Hugo Prod'homme, Philipp del Hougne
wiley   +1 more source

Regularization and error estimates for nonhomogeneous backward heat problems

Electronic Journal of Differential Equations, 2006
In this article, we study the inverse time problem for the non-homogeneous heat equation which is a severely ill-posed problem. We regularize this problem using the quasi-reversibility method and then obtain error estimates on the approximate ...
Duc Trong Dang, Huy Tuan Nguyen
doaj  

Calculation Method for the Relaxation Time Spectra of Viscoelastic Fluids Using Dynamic Moduli

Journal of Applied Science and Engineering
The influence of different error functions (standard deviation, normalized standard deviation, and chi-square) as objective functions in the calculation of the relaxation time spectrum is studied, as well as the influence of different minimization ...
Luis Hamel, Sergio D. Rosales-Anzola
doaj   +1 more source

Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems

Advanced Electronic Materials, EarlyView.
Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang, Weipeng Wang, Xuan Cong, Shiyu Wang, Gao Li, Sen Gong, Lin Huang, Hongxin Zeng, Yaxin Zhang, Ziqiang Yang   +9 more
wiley   +1 more source

Environmental Effects on RRAM Cells Based on 2D Halide Perovskite Materials

Advanced Electronic Materials, EarlyView.
RRAM offers high speed, scalability, and low power, positioning it as a next‐generation non‐volatile memory. Two‐dimensional halide perovskites show promise due to tunable optoelectronic properties and flexible processing but suffer from environmental sensitivity. This review examines degradation from humidity, temperature, light, and strain, discusses
Mojtaba Joodaki, Babitha Arun, Hartmut Hillmer, Chih‐Chieh Hsu   +3 more
wiley   +1 more source

Improved Hole Transport Layer Surface by Carbazole Ammonium Treatment for 988 nm Near‐Infrared Tin‐Lead Perovskite LEDs

Advanced Electronic Materials, EarlyView.
Carbazole ammonium molecule treatment on PEDOT:PSS hole transport layer endows improved tin‐lead perovskite crystallization and interface transport for near‐infrared LED devices. ABSTRACT Incorporating tin (Sn) and lead (Pb) into metal halide perovskites is an effective strategy for reducing bandgap energy, enabling applications in the near‐infrared ...
Jiale Chen, Jiaxiong Li, David Garcia Romero, Lijun Chen, Han Wang, Jane Kardula, Ryan Chiechi, Mordechai Kot, Wouter T. M. Van Gompel, Maria Antonietta Loi   +9 more
wiley   +1 more source

A Numerical Method for Backward Inverse Heat Conduction Problem With two Unknown Functions

International Journal of Industrial Engineering and Production Research, 2006
This paper considers a linear one dimensional inverse heat conduction problem with non constant thermal diffusivity and two unknown terms in a heated bar with unit length.
A. Shidfar, Ali Zakeri
doaj