Results 121 to 130 of about 82,897 (310)

Asymmetry of the Ferroelectric Phase Transition in BaTiO3

Advanced Materials, EarlyView.
Phase transitions are typically assumed to behave identically in forward and reverse. This work shows that in the ferroelectric material barium titanate this is not true: heating drives an abrupt, first‐order jump, while cooling gives a smooth, continuous change.
Asaf Hershkovitz, Elangovan Hemaprabha, Rajesh Mandal, Pravin Kavle, Jamil Tanus, Maya Barzilay, Ching‐Che Lin, David Spirito, Semën Gorfman, Bo Wang, Ignacio J. Villar‐García, Neus Domingo, Long‐Qing Chen, Lane W. Martin, Yachin Ivry   +14 more
wiley   +1 more source

A solution of the inverse problem for the Havriliak – Negami model in detecting breast tumors using impedance spectroscopy

Известия высших учебных заведений. Поволжский регион: Физико-математические науки
Background. The inverse problem of calculating coefficients in the Havriliak – Negami model is considered in order to determine the structure of an inhomogeneous dielectric object based on the determination of parameters and analysis of the frequency ...
Yuriy G. Smirnov, Andrey V. Kuz'min, Viktor A. Baranov   +2 more
doaj   +1 more source

Ultralow‐Frequency Epsilon‐Near‐Zero States in 3D‐Printed High‐Entropy Alloy Metacomposites for Ultra‐Thin Perfect RF Absorption

Advanced Materials, EarlyView.
Rozanov causality limit—a compulsive proportional thickness‐wavelength relationship (nd ∝ λ)—makes it challenging to develop perfect absorption with both thin thickness and low frequency. Herein, a cocktail effect in high‐entropy alloys (HEA) is crucially utilized for lowering plasma frequency to achieve epsilon‐near‐zero states, which finally enables ...
Peitao Xie, Haikun Wu, Zhenxiang Cheng, Mingxiang Liu, Yuan Liu, Weikong Pang, Runhua Fan, Yao Liu   +7 more
wiley   +1 more source

COMPLEX PERMEABILITY AND PERMITTIVITY VARIATION OF CARBONYL IRON RUBBER IN THE FREQUENCY RANGE OF 2 TO 18 GHZ. doi: 10.5028/jatm.2010.02015962

Journal of Aerospace Technology and Management, 2011
The complex dielectric permittivity (Ɛ) and magnetic permeability (μ) of Radar Absorbing Materials (RAM) based on metallic magnetic particles (carbonyl iron particles) embedded in a dielectric matrix (silicon rubber) have been studied in the frequency ...
Adriana Medeiros Gama, Mirabel Cerqueira Rezende   +1 more
doaj  

High Charge Carrier Mobility in Non‐Conjugated 3D Covalent Organic Frameworks

Advanced Materials, EarlyView.
A non‐conjugated 3D COF constructed via boronate ester linkages from tetraphenylene and pyrene‐based monomers is reported, which exhibits a high charge carrier mobility of 14 ± 1 cm2 V−1 s−1. ABSTRACT π‐Conjugation, π–π stacking, and long‐range order play a central role in determining charge transport efficiency in organic materials.
Joaquín Almarza, Karol Strutyński, Shuai Fu, Yifan Chen, Natalia M. Padial, Isabel del Barrio Gómez, Carlos Martí‐Gastaldo, Andrei N. Khlobystov, Mischa Bonn, Hai I. Wang, Manuel Melle‐Franco, Aurelio Mateo‐Alonso   +11 more
wiley   +1 more source

Ion‐Regulating Membranes with Surface‐Enriched Charge Networks Enabling Stable Zinc‐Manganese Flow Batteries

Advanced Materials, EarlyView.
An ion‐regulating membrane is designed with a surface‐concentrated positively‐charged Zn2⁺ crosslinked network for zinc‐manganese flow batteries. The membrane effectively mitigates proton crossover and regulates zinc ion distribution to avoid dendrites, thus significantly improving areal capacity and prolonging the lifespan with a record accumulated ...
Jine Wu, Jiafeng Lei, Yi‐Chun Lu
wiley   +1 more source

Metamaterial Antennas Enhance MRI of the Eye and Occipital Brain

Advanced Materials, EarlyView.
A radiofrequency antenna platform comprising planar and bend configurations is developed, incorporating structurally integrated epsilon‐negative metamaterial unit cells to enhance MRI. These antennas enable high‐resolution in vivo human MRI of the eye, orbit, and occipital brain. Comprehensive validation, including simulations, phantom experiments, SAR,
Nandita Saha, Bilguun Nurzed, Mostafa Berangi, Andre Kuehne, Helmar Waiczies, Igor Fabian Tellez Ceja, Xiang Hu, Thomas Gladytz, Lisa Krenz, Dave Huebler, Beate Endemann, Claudia Brockmann, Ebba Beller, Oliver Stachs, Thoralf Niendorf   +14 more
wiley   +1 more source

ANALYTIC MODELS FOR BISTATIC SCATTERING FROM A RANDOMLY ROUGH SURFACE WITH COMPLEX RELATIVE PERMITTIVITY.

ITU journal : ICT discoveries
This study provides explicit mathematical formulations for the bistatic scattering coefficient from a randomly rough surface with a complex relative permittivity based on the following analytic models: small perturbation model (SPM), physical optics model (PO), and Kirchhoff approximation model (KA).
Mostafa A, Karam, Ryan S, McDonough
openaire   +1 more source

A Solid State Zwitterionic Plastic Crystal With High Static Dielectric Constant

Advanced Materials, EarlyView.
Developing solid high dielectric constant materials has been a research focus in the energy storage field. In this research, we discovered a zwitterion with a plastic crystal phase. Due to the short‐range degree of freedom of the dipole moment for this zwitterion, a relatively high static dielectric constant has been achieved in its solid state ...
Zitan Huang, Yifan Liu, Tiago Outerelo Corvo, Ain Uddin, Michelle L. Lehmann, Tomonori Saito, Valentino R. Cooper, Ralph H. Colby   +7 more
wiley   +1 more source

High‐κ Perovskite‐Like Ternary Niobium Oxide Dielectrics for 2D Electronics

Advanced Materials, EarlyView.
High‐κ dielectrics are vital for scaled electronics. Here, a family of 2D high‐κ perovskite‐like ternary niobium oxides is synthesized via a molten salt‐assisted method. Their integration into FETs and logic gates reveals superior switching characteristics, providing a fresh material platform and new insights for the advancement of high‐performance 2D ...
Biao Zhang, Jianmiao Guo, Jianmin Yan, Jialiang Wang, Chao Yun, Guang Zeng, Jie Li, Cong Wang, Zhengdao Xie, Yanglong Hou, Yang Chai   +10 more
wiley   +1 more source