Results 81 to 90 of about 135,613 (269)

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

Characteristic Polynomials [PDF]

Canadian Journal of Mathematics, 1957
Let F be a field and let V be a finite dimensional vector space over F which is also a module over the ring F[a]. Here a may lie in any extension ring of F. We do not assume, as yet, that V is a faithful module, so that a need not be a linear ...
openaire   +2 more sources

Universal Conductance Fluctuations in Quantum Anomalous Hall Insulators

Advanced Materials, EarlyView.
Universal conductance fluctuations are observed in mesoscopic quantum anomalous Hall insulators. Two distinct fluctuation patterns are identified, arising from different interference processes of bulk and chiral edge states, respectively. These findings unveil rich quantum interference phenomena in quantum anomalous Hall insulators and provide insights
Peng Deng, Peng Zhang, Gang Qiu, Ting‐Hsun Yang, Chang Niu, Yaochen Li, Wenqiang Cui, Yang Feng, Peide D. Ye, Ke He, Kai Chang, Kang L. Wang   +11 more
wiley   +1 more source

Triggered Ferroelectricity in HfO2 From Hybrid Phonons and Higher‐Order Dynamical Charges

Advanced Materials, EarlyView.
We combine first‐principles calculations, LGD theory and group theory to demonstrate the mechanism of hybrid‐triggered ferroelectricity in HfO2${\rm HfO}_2$, enabled by trilinear and quadlinear couplings between stable polar and nonpolar modes. HfO2${\rm HfO}_2$ hosts unconventional interplay between structure modes where substantial contribution to ...
Seongjoo Jung, Turan Birol
wiley   +1 more source

WAVE POLYNOMIALS

Tamkang Journal of Mathematics, 1997
A generating function for homogeneous polynomial solutions of the wave equation in $n$-dimensions is obtained. Application is made to developing an integral operator for analytic solutions of the wave equation.
Fryant, A., Vemuri, M. K.
openaire   +4 more sources

Humid‐Air Condensation Heat Transfer on Hierarchical Structured Superhydrophobic Graphite Composites

Advanced Materials Interfaces, EarlyView.
Humid‐air condensation on graphite composites shows that making a surface superhydrophobic is not sufficient to enhance heat transfer. A hierarchical CuO/lauric‐acid coating yields spherical droplets but promotes Wenzel‐type pinning and adds effective thermal resistance under operation.
Raphael Raab, Tobias Melchior, Hannah Mennecke, Daniel Fotachov, Egbert Oesterschulze, Thomas Reviol, Erik von Harbou, Hans‐Jörg Bart   +7 more
wiley   +1 more source

Algorithmic polynomials [PDF]

Proceedings of the 50th Annual ACM SIGACT Symposium on Theory of Computing, 2018
The approximate degree of a Boolean function $f(x_{1},x_{2},\ldots,x_{n})$ is the minimum degree of a real polynomial that approximates $f$ pointwise within $1/3$. Upper bounds on approximate degree have a variety of applications in learning theory, differential privacy, and algorithm design in general.
openaire   +3 more sources

Pattern Formation in Non‐Equilibrium Architected Materials

Advanced Materials Technologies, EarlyView.
This article demonstrates an artificial mechanical system ‐ a robotic metamaterial ‐ as an accessible and versatile platform within which to explore and prescribe the reaction‐diffusion driven pattern formation hitherto associated with comparatively less accessible and versatile non‐equilibrium biological and chemical systems.
Vinod Ramakrishnan, Michael J. Frazier
wiley   +1 more source

Polynomial Closure

Journal of Number Theory, 1996
We quote the author's words: ``Let \(D\) be a domain with quotient field \(K\). The polynomial closure of a subset \(E\) of \(K\) is the largest subset \(F\) of \(K\) such that each polynomial (with coefficients in \(K\)), which maps \(E\) into \(D\), maps also \(F\) into \(D\).
openaire   +1 more source

Nonlinear Evolutionary Pattern Recognition of Land Subsidence in the Beijing Plain

Remote Sensing
Beijing is a city on the North China Plain with severe land subsidence. In recent years, Beijing has implemented effective measures to control land subsidence.
Mingyuan Lyu, Xiaojuan Li, Yinghai Ke, Jiyi Jiang, Zhenjun Sun, Lin Zhu, Lin Guo, Zhihe Xu, Panke Tang, Huili Gong, Lan Wang   +10 more
doaj   +1 more source