Results 131 to 140 of about 518,702 (319)

What if the Universe Expands Linearly? A Local General Relativity to Solve the “Zero Active Mass” Problem

The Astrophysical Journal
Modern cosmology presents important challenges such as the Hubble Tension, El Gordo’s collision, or the impossible galaxies ( z > 10). Slight modifications to the standard model propose new parameters (e.g., the early and dynamical dark energy).
Robert Monjo
doaj   +1 more source

Review of Thermally Activated Twisted Coiled Polymer Actuators: A Materials Science Perspective

Advanced Functional Materials, EarlyView.
Thermally activated twisted and coiled polymer actuators (TCPAs) combine lightweight design, large deformation, and scalable fabrication for soft robotic and wearable applications. This review connects polymer structure, processing history, helix geometry, and thermomechanical characterization to actuator performance, highlighting current challenges in
Nadja Schenk, Lukas Benecke, Chokri Cherif, Johannes Mersch   +3 more
wiley   +1 more source

Smooth boundary topology optimisation applied to an electrostatic actuator

, 2008
Smooth boundary topology optimisation in conjunction with the continuum design sensitivity analysis avoids many of the problems encountered by conventional cell-based systems coupled with material homogenisation or the density method.
Lowther, D.A., Kim, D.H., Sykulski, J.K.
core  

The Kibble-Zurek mechanism at exceptional points

Nature Communications, 2019
Universal non-equilibrium behaviour can emerge in physical systems when they are driven through a parameter regime where their energy gap closes. Dóra et al.
Balázs Dóra, Markus Heyl, Roderich Moessner   +2 more
doaj   +1 more source

Mesoscale Domain Evolution Mechanism during Alternating Current (AC) Poling of Relaxor Ferroelectrics

Advanced Functional Materials, EarlyView.
Ferroelectric domain variants that are energetically equivalent are expected to remain preserved during polarization reversal. However, phase‐field simulations reveal that inclined domain walls in relaxor ferroelectrics can undergo irreversible elimination during alternating current poling through a proximity effect driven by long‐range elastic ...
Yuan‐Jie Sun, Bo Wang, Long‐Qing Chen   +2 more
wiley   +1 more source

Topics in Topology and Homotopy Theory

, 2005
This book is addressed to those readers who have been through Rotman (or its equivalent), possess a wellthumbed copy of Spanier, and have a good background in algebra and general topology.
Warner, Garth
core  

Imaging magnetic order in a two-dimensional iron-rich phyllosilicate

Communications Materials
Magnetic domain formation in two-dimensional materials offers insight into the fundamentals of magnetism and serves as a catalyst for the advancement of spintronics.
Muhammad Zubair Khan, Andriani Vervelaki, Daniel Jetter, Kousik Bagani, Andreas Ney, Oleg E. Peil, Sergio Valencia, Alevtina Smekhova, Florian Kronast, Daniel Knez, Martina Dienstleder, Martino Poggio, Aleksandar Matković   +12 more
doaj   +1 more source

Shaping Matter with Acoustic Waves: From Particles to Functional Structures

Advanced Functional Materials, EarlyView.
Acoustic‐directed assembly is reviewed as a materials‐oriented strategy for organizing particles, polymers, metals, and biological systems into functional structures. The review distinguishes reversible manipulation from permanent structure formation through medium fixation, particle fixation, and in situ material generation, highlighting routes toward
Avraham Kenigsberg, Shelly Zlotnikov, Maya Fiorentino, Yuval Elias, Ornit Nagler‐Avramovitz, Hagay Shpaisman   +5 more
wiley   +1 more source

Geometry and Topology with Applications

This reprint is a Special Issue of MDPI’s Mathematics, titled “Geometry and Topology with Applications”, and it collects several papers that are in some way related to the general research field of geometry.

core   +1 more source

Interstitium‐Mimicking Porous Alveolar Membranes Enable Physiologic Aerosol Transport and Distinct Acute‐Chronic Lung Injury Responses

Advanced Functional Materials, EarlyView.
An interstitium‐mimicking membrane combines three‐dimensional alveolar geometry, high pore interconnectivity, and mechanical compliance to overcome transport limitations of conventional lung‐on‐chip barriers. The resulting platform supports physiologic aerosol transport, quantitative analysis of cross‐barrier particle movement, and reveals divergent ...
Jae‐Won Choi, Sheng Zhang, Abbas Jalili, August Kohls, Woo‐Youl Maeng, Sikandar Azam, Wu Liu, Barbie Varghese, Yixin Zhao, Xi Ren, Shimin Liu, Si‐Yang Zheng   +11 more
wiley   +1 more source