Results 81 to 90 of about 429,197 (329)

On The Positive Definite Solutions Of Nonlinear Matrix Equation

, 2013
In this paper, the nonlinear matrix equation is investigated. Based on the fixed-point theory, the boundary and the existence of the solution with the case r>-δi are discussed. An algorithm that avoids matrix inversion with the case -1<-δi<0 is proposed.
Baoguang, Tian, Chunyan, Liang, And Chen Nan   +2 more
openaire   +1 more source

Cellular Identity Crisis: RD3 Loss Fuels Plasticity and Immune Silence in Progressive Neuroblastoma

Advanced Science, EarlyView.
Researchers discovered that therapy‐induced loss of RD3 protein in neuroblastoma triggers a dangerous shift: cancer cells become more stem‐like, invasive, and resistant to treatment while evading immune detection. RD3 loss suppresses antigen presentation and boosts immune checkpoints, creating an immune‐silent environment.
Poorvi Subramanian, Sreenidhi Mohanvelu, Sheeja Aravindan, Afsana Parveen Jahir Hussain, Sivasubramani Narayanan, Sabir Salim, Loganayaki Periyasamy, Natarajan Aravindan   +7 more
wiley   +1 more source

Trace inequalities for positive definite matrix power products

Linear Algebra and its Applications, 1990
Let A and B be Hermitian positive semidefinite \(N\times N\) matrices and let the eigenvalues of A and B be \(a_ 1,...,a_ N\) and \(b_ 1,...,b_ N\), respectively, with \(0\leq a_ 1\leq a_ 2\leq...\leq a_ N\) and \(0\leq b_ 1\leq b_ 2\leq...\leq b_ N\). The authors give an elementary proof for the inequalities: \[ \sum^{N}_{i=1}a^ n_ i b^ n_{N-i}\leq tr(
Bushell, P.J., Trustrum, G.B.
openaire   +2 more sources

Nucleoside‐Based Hydrogel Platform Synergizes with Photothermal Effects for Enhanced Biofilm Eradication Against Periodontitis

Advanced Science, EarlyView.
A synergistic antibiofilm hydrogel platform (ZBAg@FNP) is developed by encapsulating an organic small‐molecule photothermal agent (FNP) within a silver ion‐mediated supramolecular hydrogel (ZBAg), enabling photothermal disruption of biofilm integrity and controlled Ag⁺ ion release upon irradiation.
Yinghui Wen, Yunfei Li, Tiannan Liu, Chongkui Sun, Hang Zhao, Yao Yuan, Shiping Yang, Tingxing Zhao, Jiang Liu   +8 more
wiley   +1 more source

Advancing Direct Alcohol Fuel Cells: Innovations in Composite‐Based Electrocatalysts and Polymer Support Materials for Enhanced Efficiency

Advanced Energy and Sustainability Research, EarlyView.
This graphical abstract emphasizes the working principle and the various essential factors of the direct methanol fuel cell (DMFCs). Additionally, various parameters, such as the nanoparticle's size and shape, the nature of the electrolyte, the type of support materials, and their fabrication process, also play essential roles in the functioning of the
Kirti Mishra, Samarjeet Singh Siwal, Phil Hart, Vijay Kumar Thakur   +3 more
wiley   +1 more source

Positive Semidefiniteness and Positive Definiteness of a Linear Parametric Interval Matrix

, 2017
We consider a symmetric matrix, the entries of which depend linearly on some parameters. The domains of the parameters are compact real intervals. We investigate the problem of checking whether for each (or some) setting of the parameters, the matrix is ...
A Neumaier, A Skjäl, B Gärtner, CA Floudas, CD Meyer, D Hertz, ED Popova, ED Popova, ER Hansen, G Mayer, G Rex, H Leng, J Rohn, J Shao, L Jaulin, L Vandenberghe, LV Kolev, LV Kolev, LV Kolev, M Fiedler, M Hladík, M Hladík, M Hladík, M Mönnigmann, M Zimmer, MH Matcovschi, RB Kearfott, S Białas, S Poljak, SM Rump, Y Nesterov   +30 more
core   +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

Robust Reinforcement Learning Control Framework for a Quadrotor Unmanned Aerial Vehicle Using Critic Neural Network

Advanced Intelligent Systems, Volume 7, Issue 3, March 2025.
Quadrotor unmanned aerial vehicle control is critical to maintain flight safety and efficiency, especially when facing external disturbances and model uncertainties. This article presents a robust reinforcement learning control scheme to deal with these challenges.
Yu Cai, Yefeng Yang, Tao Huang, Boyang Li   +3 more
wiley   +1 more source

A fast, preconditioned conjugate gradient Toeplitz solver [PDF]

A simple factorization is given of an arbitrary hermitian, positive definite matrix in which the factors are well-conditioned, hermitian, and positive definite.
Pan, Victor, Schrieber, Robert
core   +1 more source

Positive definiteness: from scalar to operator-valued kernels [PDF]

Surveys in Mathematics and its Applications, 2021
In this paper we present a short overview of results that provide relationships among scalar, matrix-valued and certain operator-valued positive definite kernels.
V. A. Menegatto
doaj