Results 71 to 80 of about 66,244 (252)

Electrocatalytic Coupling Conversion of Methane by Dual‐Site Control in Nickel Oxyhydroxide

Advanced Science, EarlyView.
Electrocatalytic coupling conversion of methane (CH4) is accomplished on the nickel oxyhydroxide (NiOOH), wherein the Ni─O dual‐site is triggered via the proper electronic interaction, synergistically promoting the C─H activation and C─C formation, enabling a selective and efficient C2 product generation route under ambient conditions. ABSTRACT Methane
Kailong Lu, Yangshen Chen, Junhao Wang, Yi Zhang, Sunyang He, Huimin Xu, Hui Liu, Jiao Deng   +7 more
wiley   +1 more source

Novel Steganographic Method Based on Hermitian Positive Definite Matrix and Weighted Moore–Penrose Inverses

Applied Sciences
In this paper, we describe the concept of a new data-hiding technique for steganography in RGB images where a secret message is embedded in the blue layer of specific bytes.
Selver Pepić, Muzafer Saračević, Aybeyan Selim, Darjan Karabašević, Marija Mojsilović, Amor Hasić, Pavle Brzaković   +6 more
doaj   +1 more source

Positive definite matrix approximation with condition number constraint POSITIVE DEFINITE MATRIX APPROXIMATION WITH CONDITION NUMBER CONSTRAINT [PDF]

, 2020
. Positive definite matrix approximation with a condition number constraint is an optimization problem to find the nearest positive definite matrix whose condition number is smaller than a given constant. We demonstrate that this problem can be converted
Kazuhide Nakata, Mirai Tanaka
core  

Positive definite completions and determinant maximization [PDF]

, 1999
A method is described for determining whether a positive definite completion of a given partial Hermitian matrix exists and, if so, for finding the determinant maximizing positive definite completion.
Tarazaga, P., Johnson, Charles R., Glunt, W., Hayden, T.L.   +3 more
core   +1 more source

Deep Learning Network‐Tailored Microenvironment Matching of 4D Bioprinting Bioactive Scaffolds for Bone Regeneration

Advanced Science, EarlyView.
A DLN dataset was built to analyze MABS composition versus in vitro/in vivo osteogenesis and angiogenesis. An MLP neural network, taking BG morphological parameters as input, extracts bioactive features from these datasets. A rabbit tibial defect model then validates 4D‐printed MABS for adaptability and bone regeneration in critical defects.
Xiongjie Liang, Yuechi Zhang, Weifeng Hu, Shiyan Lv, Fan Jia, Yan Zhang, Feng Wu, Changjiang Yang, Guanqi Zhen, Jinglong Yan, Xu Cui, Wei Zhao, Guanghua Chen   +12 more
wiley   +1 more source

A Stable Difference Scheme for a Third-Order Partial Differential Equation

Современная математика: Фундаментальные направления, 2018
The nonlocal boundary-value problem for a third order partial differential equation in a Hilbert space H with a self-adjoint positive definite operator A is considered.
A Ashyralyev, Kh Belakroum
doaj   +1 more source

ORBIT‐AMD: Ordinal Risk, Bilateral Imaging, and Trajectory Learning for Age‐Related Macular Degeneration in Multi‐Cohorts

Advanced Science, EarlyView.
Eligibility flow and real‐world AMD burden in the UKB retinal imaging cohort and TMUEH external‐validation cohort. Overview of the ORBIT‐AMD architecture, integrating retinal representation pretraining, bilateral eye‐graph modeling and concept bottleneck learning to support ordered risk, bilateral context, interpretable lesion concepts, longitudinal ...
Xuehao Cui, Dejia Wen, Patrick Yu‐Wai‐Man, Xiaorong Li   +3 more
wiley   +1 more source

Perturbation Analysis for the Matrix Equation X−∑i=1mAi∗XAi+∑j=1nBj∗XBj=I

Journal of Applied Mathematics, 2012
We consider the perturbation analysis of the matrix equation X−∑i=1mAi∗XAi+∑j=1nBj∗XBj=I. Based on the matrix differentiation, we first give a precise perturbation bound for the positive definite solution.
Xue-Feng Duan, Qing-Wen Wang
doaj   +1 more source

Continuations of Hermitian indefinite functions and corresponding canonical systems : an example [PDF]

, 2004
M. G. Krein established a close connection between the continuation problem of positive definite functions from a finite interval to the real axis and the inverse spectral problem for differential operators.
Langer, M., Sasvári, Zoltán, Langer, H., Langer, Heinz, Langer, Matthias, Sasvari, Z.   +5 more
core  

THE POSITIVE-DEFINITE COMPLETION PROBLEM [PDF]

We study the positive-definite completion problem for kernels on a variety of domains and prove results concerning the existence, uniqueness, and characterization of solutions.
Panaretos, Victor M., Waghmare, Kartik G.   +1 more
core   +1 more source