Results 101 to 110 of about 227,128 (319)

The arithmetic-geometric-harmonic-mean and related matrix inequalities

Linear Algebra and its Applications, 1997
Recently, Sagae and Tanabe defined a geometric mean of positive definite matrices and proved the harmonic-geometric-arithmetic- mean inequality. Here, we give a reversal of these results.
Alić, M., Mond, B., Pečarić, J., Volenec, V.   +3 more
openaire   +3 more sources

Bio‐Inspired Cascade Photocatalysis on Fe Single‐Atom Carbon Nitride Upcycles Plastic Wastes for Effective Acetic Acid Production

Advanced Energy Materials, EarlyView.
This work demonstrates a novel cascade photocatalysis concept using Fe single‐atom catalysts (Fe@C3N4 SAC) to directly upcycle plastics (PET, PP, PE, PVC) into valuable acetic acid at ambient conditions. Inspired by microbial degradation, the bifunctional cascade photocatalyst combines Fenton‐like oxidation and CO2 photoreduction, as validated by ...
Wei Wei, Cheng Du, Jiawei Ge, Xiang Wang, Zuolong Chen, Meng Zhang, Tao Guo, Lei Wang, Maoyu Wang, Yuzi Liu, Hua Zhou, Chengjun Sun, Ning Chen, Weifeng Chen, Brant Billinghurst, Mohsen Shakouri, Peter Sprenger, Fatemeh Fani Sani, Yulian Quan, Brian Kendall, Roy Brouwer, Yimin A. Wu   +21 more
wiley   +1 more source

Metode Alternatif Hitung Ipkm yang Memiliki Korelasi Lebih Tinggi dengan Ipm [PDF]

, 2017
Human Development Index (HDI) is one of important multi dimension indicators that has been used to monitor population life development based on three dimensions (health, education and adequate living standard).
Kusumawardani, N. -. (Nunik), Santya, R. N. (Roy)   +1 more
core  

3D investigation and modeling of the geometric effects on porosity in packed beds

AIChE Journal, EarlyView.
Abstract In porous beds, physical boundaries restrict particle arrangement, leading to inhomogeneous porosity. This paper reports on the porosity profiles that are the result of geometric effects on monodisperse packed beds in cylindrical and cubic arrangements. Special focus is given to the influence of edges and corners in cubic geometries.
Bastian Oldach, Konrad E. R. Boettcher, Alexander S. Sommer‐Behr, Norbert Kockmann   +3 more
wiley   +1 more source

A new class of copulas with tail dependence and a generalized tail dependence estimator [PDF]

We present a new family of copulas (generalized mean copulas) which is positive comprehensive and allows for upper tail dependence. It includes the Spearman copula and a specific Fréchet copula as special cases.
Fischer, Matthias J., Hinzmann, Gerd
core  

Elliptic filter design using arithmetic-geometric mean

Electronics Letters, 1980
A simple direct algorithm for computation of elliptic functions for use in designing elliptic filters is offered. Compromise approximations to common filter specifications are not required. Precision is limited only by the accuracy of the processor and its square root, sine and arcsine routines.
G.B. Parks, M.A. Soderstrand
openaire   +1 more source

Flexible Memory: Progress, Challenges, and Opportunities

Advanced Intelligent Discovery, EarlyView.
Flexible memory technology is crucial for flexible electronics integration. This review covers its historical evolution, evaluates rigid systems, proposes a flexible memory framework based on multiple mechanisms, stresses material design's role, presents a coupling model for performance optimization, and points out future directions.
Ruizhi Yuan, Sen Chen, Minghui Guo, Ziliang Cui, Yujie Du, Jing Liu   +5 more
wiley   +1 more source

Interpretability and Representability of Commutative Algebra, Algebraic Topology, and Topological Spectral Theory for Real‐World Data

Advanced Intelligent Discovery, EarlyView.
This article investigates how persistent homology, persistent Laplacians, and persistent commutative algebra reveal complementary geometric, topological, and algebraic invariants or signatures of real‐world data. By analyzing shapes, synthetic complexes, fullerenes, and biomolecules, the article shows how these mathematical frameworks enhance ...
Yiming Ren, Guo‐Wei Wei
wiley   +1 more source

Proposal and validation of geostatistical-based metrics to quantify within-field variability [PDF]

Revista Brasileira de Ciência do Solo
Metrics are fundamental to quantify and classify the spatial dependence of soil and agricultural attributes. This study aimed to propose and validate metrics based on two distinct approaches, one additive, which considers the arithmetic mean of the ...
Enio Júnior Seidel, Marcelo Silva de Oliveira   +1 more
doaj   +1 more source

Comparison of Harmonic, Geometric and Arithmetic means for change detection in SAR time series [PDF]

, 2012
International audienceThe amplitude distribution in a SAR image can present a heavy tail. Indeed, very high-valued outliers can be observed. In this paper, we propose the usage of the Harmonic, Geometric and Arithmetic temporal means for amplitude ...
Nicolas, Jean-Marie, Pinel-Puysségur, Béatrice, Quin, Guillaume   +2 more
core   +1 more source