Results 121 to 130 of about 175,993 (310)
Magnetic Resonance in Medicine, EarlyView.Abstract Purpose The aim of this work is to make the DTI along the perivascular space (DTI‐ALPS‐index) more robust with respect to region selection and the orientation of the head and fibers. We propose to address this matter by using the principal diffusion directions and an automated, atlas‐based region of interest (ROI) placement.
Ali Ajouz +5 more
wiley +1 more source
Analytical and experimental investigation of a 1/8-scale dynamic model of the shuttle orbiter. Volume 1: Summary report [PDF]
A 1/8-scale structural dynamics model of the space shuttle orbiter was analyzed using the NASA Structural Analysis System (NASTRAN). Comparison of the calculated eigenvalues with preliminary test data for the unrestrained condition indicate that the ...
Bernstein, M. +3 more
core +1 more source
International Journal of Mechanical System Dynamics, EarlyView.ABSTRACT Modern engineering systems require advanced uncertainty‐aware model updating methods that address parameter correlations beyond conventional interval analysis. This paper proposes a novel framework integrating Riemannian manifold theory with Gaussian Process Regression (GPR) for systems governed by Symmetric Positive‐Definite (SPD) matrix ...
Yanhe Tao +3 more
wiley +1 more source
Eigenpairs of adjacency matrices of balanced signed graphs
Special MatricesIn this article, we study eigenvalues λ\lambda and their associated eigenvectors xx of the adjacency matrices AA of balanced signed graphs. Balanced signed graphs were first introduced and studied by Harary to handle a problem in social psychology ...
Chen Mei-Qin
doaj +1 more source
On the Relations between Eigenvalues and Eigenvectors for Matrices Resulting from Pre and Post Multiplication by the Transpose [PDF]
, 1968 V. J. Law, R. H. Fariss
openalex +1 more source
On estimating the condition of eigenvalues and eigenvectors
Linear Algebra and its Applications, 1987 The author computes condition numbers for a given matrix eigenvalue and the corresponding eigenvector. For this purpose he applies the packages EISPACK and LINPACK. He claims that it requires only \(O(n^ 2)\) flops per eigenpair under the assumption that the matrix is reduced to Hessenberg form.
openaire +2 more sources
Almost Eigenvalues and Eigenvectors of Almost Mathieu Operators
, 2015 The almost Mathieu operator is the discrete Schr\"odinger operator $H_{\alpha,\beta,\theta}$ on $\ell^2(\mathbb{Z})$ defined via $(H_{\alpha,\beta,\theta}f)(k) = f(k + 1) + f(k - 1) + \beta \cos(2\pi \alpha k + \theta) f(k)$. We derive explicit estimates
Strohmer, Thomas, Wertz, Tim
core
International Journal of Mechanical System Dynamics, EarlyView.ABSTRACT This paper analyzes the dynamic behavior of a two‐degree‐of‐freedom system subjected to electromagnetic interaction modelled through a skew‐symmetric coupling matrix. The system comprises two mechanically independent oscillators coupled by velocity‐dependent electromagnetic forces.
Fernando Cortés +4 more
wiley +1 more source
Polymer Engineering &Science, EarlyView.Study on transient parison formation at various strokes during extrusion of Newtonian and viscoelastic fluids. In the presence of an offset between the mandrel and the bushing, Newtonian fluids exhibit a reduction in extrudate diameter, whereas viscoelastic fluids display diameter swelling only at flow rates exceeding a critical threshold.
Kalonji K. Kabanemi +2 more
wiley +1 more source
Eigenvalues and Eigenvectors of the Interaction Term in Local Quantum Field Theory [PDF]
, 1971 David Kershaw
openalex +1 more source