Results 161 to 170 of about 448,247 (335)
Topological Metamaterial for Magnetic Resonance Imaging
Interdisciplinary Materials, EarlyView.This work introduces a wireless, passive topological circuit metamaterial for Magnetic resonance imaging (MRI) that supports dual topological boundary states, enabling superior local radiofrequency field confinement. Planar‐to‐three‐dimensional stacking enhances image signal‐to‐noise ratio across imaging sequences, offering a robust and clinically ...
Siyong Zheng +16 more
wiley +1 more source
Subspace methods in the eigenvalue problem [PDF]
, 2008 The eigenvalue problem plays an important role in many areas of mathematics, science, and engineering. In many situations, we are confronted with the problem of finding the lowest or highest, few eigenpairs of a large, sparse, and symmetric matrix ...
Yasmine F Balkis
core +1 more source
Institutional Diversity in Banking and Economic Complexity
International Journal of Finance &Economics, EarlyView.ABSTRACT In this paper, we test whether institutional diversity in banking systems is beneficial to economic complexity, using data for Italian provinces in the period 1998–2017. We compute different indexes that consider diversity from an ownership, institutional, business model and competition point of view and find that higher diversity has a ...
Beniamino Pisicoli
wiley +1 more source
OPTIMIZATION AND APPROXIMATION OF NC POLYNOMIALS WITH SUMS OF SQUARES
Croatian Operational Research Review, 2010 In this paper we study eigenvalue optimization of non-commutative polynomials. That is, we compute the smallest or biggest eigenvalue a non-commutative polynomial can attain. Our algorithm is based on sums of hermittian squares.
Kristijan Cafuta, Igor Klep
doaj
Artificial intelligence–driven decoupling structure–activity relationship for lithium‐ion batteries
InfoScience, EarlyView.Artificial intelligence can efferently accelerate the high‐throughput screening of battery materials, the analysis of multiphase mechanisms, and the precise prediction of capacity and cycle life. This review systematically summarizes the applications of machine learning (ML) in decoupling the complex structure‐activity relationships of lithium‐ion ...
Tao Wang +6 more
wiley +1 more source
Revisiting EWMA in High‐Frequency‐Based Portfolio Optimization: A Comparative Assessment
Journal of Applied Econometrics, EarlyView.ABSTRACT This paper compares the statistical and economic performance of state‐of‐the‐art high‐frequency (HF) based multivariate volatility models with a simpler, widely used alternative, the Exponentially Weighted Moving Average (EWMA) filter. Using over two decades of 100 U.S.
Laura Capera Romero, Anne Opschoor
wiley +1 more source
Journal of Applied Econometrics, EarlyView.ABSTRACT We present four novel tests of equal predictive accuracy and encompassing á Pitarakis (2023, 2025) for factor‐augmented regressions. Factors are estimated using cross‐section averages (CAs) of grouped series and our theoretical findings are empirically relevant: asymptotic normality, robustness to an overspecification of the number of factors,
Alessandro Morico, Ovidijus Stauskas
wiley +1 more source
Identifying Peer Effects in Networks with Unobserved Effort and Isolated Students
Journal of Applied Econometrics, EarlyView.ABSTRACT Peer influence on effort devoted to some activity is often studied when effort is unobserved, and the researcher instead observes an outcome that combines effort with other shocks. For instance, in education, achievement measures such as GPA reflect both effort and idiosyncratic GPA shocks.
Aristide Houndetoungan +2 more
wiley +1 more source
JCPP Advances, EarlyView.Abstract Background Children with Attention‐Deficit/Hyperactivity Disorder (ADHD) encounter a range of difficulties in daily life. Guided by previous studies and theories, this pilot study examined whether distinct subgroups of children with ADHD could be identified based on their appraisals of the causes of their symptoms and the strategies they use ...
Noam Ringer, Adva Eichengreen
wiley +1 more source
Hitting Times in the Binomial Random Graph
Journal of Graph Theory, EarlyView.ABSTRACT Fix k ≥ 2 $k\ge 2$, choose log n n ( k − 1 ) ∕ k ≤ p ≤ 1 − Ω ( log 4 n n ) $\frac{\mathrm{log}n}{{n}^{(k-1)\unicode{x02215}k}}\le p\le 1-{\rm{\Omega }}(\frac{{\mathrm{log}}^{4}n}{n})$, and consider G ~ G ( n , p ) $G\unicode{x0007E}G(n,p)$. For any pair of vertices v , w ∈ V ( G ) $v,w\in V(G)$, we give a simple and precise formula for the ...
Bertille Granet +2 more
wiley +1 more source