Results 71 to 80 of about 108,134 (338)
Advanced Materials, EarlyView.Magnetic doping of the topological insulator Bi2Te3 with erbium adatoms induces out‐of‐plane magnetism and breaks time‐reversal symmetry, opening a Dirac gap and driving a Fermi surface transition from hexagonal to star‐of‐David geometry. Microscopy, spectroscopy, and magnetic dichroism reveal atomically controlled magnetic interactions that tailor the
Beatriz Muñiz Cano +18 more
wiley +1 more source
Sensors, 2019 Hybrid massive MIMO structures with lower hardware complexity and power consumption have been considered as potential candidates for millimeter wave (mmWave) communications.
Rui Hu +4 more
doaj +1 more source
Symmetric positive semi-definite Fourier estimator of instantaneous variance-covariance matrix [PDF]
, 2023 Jirô Akahori +4 more
openalex +1 more source
Large Covariance Matrix Estimation by Composite Minimization [PDF]
, 2015 The present thesis concerns large covariance matrix estimation via composite minimization under the assumption of low rank plus sparse structure. Existing methods like POET (Principal Orthogonal complEment Thresholding) perform estimation by extracting principal components and then applying a soft thresholding algorithm.
openaire +2 more sources
Covariance Matrix Estimation for Massive MIMO [PDF]
IEEE Signal Processing Letters, 2018 6 pages, 4 figures.
Vorobyov, Sergiy, A., Upadhya, Karthik
openaire +3 more sources
AI–Guided 4D Printing of Carnivorous Plants–Inspired Microneedles for Accelerated Wound Healing
Advanced Materials, EarlyView.This work presents an artificial intelligence (AI)‐guided 4D‐printed microneedle platform inspired by carnivorous plants for wound healing. A thermo‐responsive shape memory polymer enables body temperature–triggered self‐coiling for autonomous wound closure.
Hyun Lee +21 more
wiley +1 more source
On estimation of the diagonal elements of a sparse precision matrix
, 2016 In this paper, we present several estimators of the diagonal elements of the inverse of the covariance matrix, called precision matrix, of a sample of iid random vectors. The focus is on high dimensional vectors having a sparse precision matrix.
Balmand, Samuel, Dalalyan, Arnak S.
core +1 more source
Direct Laser Writing of Magnetic Micro Actuators With a Stimulus‐Responsive Compliant Hinge
Advanced Materials Technologies, EarlyView.This study presents a versatile modular design strategy for adaptive 3D microactuators. Using two‐photon‐induced C,H insertion reactions within solid polymer layers, chemically distinct hinge and stimulus responsive materials are patterned in one step. The hinge's properties enable tunable motion, mechanical control, and reconfigurable actuation across
Eleonora Galli +4 more
wiley +1 more source
A Fast Algorithm for the Computation of HAC Covariance Matrix Estimators
Econometrics, 2017 This paper considers the algorithmic implementation of the heteroskedasticity and autocorrelation consistent (HAC) estimation problem for covariance matrices of parameter estimators.
Jochen Heberle, Cristina Sattarhoff
doaj +1 more source
Conditional tests for elliptical symmetry using robust estimators
, 2015 This paper presents a procedure for testing the hypothesis that the underlying distribution of the data is elliptical when using robust location and scatter estimators instead of the sample mean and covariance matrix.
Bianco, Ana M. +2 more
core +2 more sources