Results 71 to 80 of about 938,544 (352)

Totally real surfaces in CP2 with parallel mean curvature vector

International Journal of Mathematics and Mathematical Sciences, 1992
It has been shown that a totally real surface in CP2 with parallel mean curvature vector and constant Gaussian curvature is either flat or totally geodesic.
M. A. Al-Gwaiz, Sharief Deshmukh
doaj   +1 more source

Fluid Biomarkers of Disease Burden and Cognitive Dysfunction in Progressive Supranuclear Palsy

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Identifying objective biomarkers for progressive supranuclear palsy (PSP) is crucial to improving diagnosis and establishing clinical trial and treatment endpoints. This study evaluated fluid biomarkers in PSP versus controls and their associations with regional 18F‐PI‐2620 tau‐PET, clinical, and cognitive outcomes.
Roxane Dilcher, Charles B. Malpas, Stuart J. McDonald, William T. O’Brien, Craig Despott, Kelly L. Bertram, Matthew P. Pase, Lukas Frontzkowski, Meng Law, Terence J. O’Brien, Lucy Vivash   +10 more
wiley   +1 more source

Winding number selection on merons by Gaussian curvature’s sign

Scientific Reports, 2019
We study the relationship between the winding number of magnetic merons and the Gaussian curvature of two-dimensional magnetic surfaces. We show that positive (negative) Gaussian curvatures privilege merons with positive (negative) winding number.
R. G. Elías, N. Vidal-Silva, V. Carvalho-Santos   +2 more
semanticscholar   +1 more source

Prescribing Gaussian curvature on $R^2$ [PDF]

Proceedings of the American Mathematical Society, 1997
The author derives a sufficient condition for a radially symmetric function \(K(x)\) which is positive somewhere to be a conformal curvature on \(\mathbb{R}^2\). In particular, it is shown that every nonnegative radially symmetric continuous function \(K(x)\) on \(\mathbb{R}^2\) is a conformal curvature. This is equivalent to the problem of solving the
openaire   +1 more source

Bianchi transformation of the Minding coil

Дифференциальная геометрия многообразий фигур
The work is devoted to the study of the Bianchi transform for surfac­es of constant negative Gaussian curvature. The surfaces of rotation of constant negative Gaussian curvature are the Mining top, the Minding coil, the pseudosphere (Beltrami surface ...
M. A. Cheshkova
doaj   +1 more source

Hopfield Neural Networks for Online Constrained Parameter Estimation With Time‐Varying Dynamics and Disturbances

International Journal of Adaptive Control and Signal Processing, EarlyView.
This paper proposes two projector‐based Hopfield neural network (HNN) estimators for online, constrained parameter estimation under time‐varying data, additive disturbances, and slowly drifting physical parameters. The first is a constraint‐aware HNN that enforces linear equalities and inequalities (via slack neurons) and continuously tracks the ...
Miguel Pedro Silva
wiley   +1 more source

Minimal Gaussian Curvature Surface

, 2021
This paper deals with finding surfaces in $\mathbb{R}^3$ which are as close as possible to being flat and span a given contour such that the contour is a geodesic on the sought surface. We look for a surface which minimizes the total Gaussian curvature squared.
openaire   +2 more sources

Characterization of Defect Distribution in an Additively Manufactured AlSi10Mg as a Function of Processing Parameters and Correlations with Extreme Value Statistics

Advanced Engineering Materials, EarlyView.
Predicting extreme defects in additive manufacturing remains a key challenge limiting its structural reliability. This study proposes a statistical framework that integrates Extreme Value Theory with advanced process indicators to explore defect–process relationships and improve the estimation of critical defect sizes. The approach provides a basis for
Muhammad Muteeb Butt, Varma Kvvssn, Hossein Laieghi, Zia Uddin, Peyman Ansari, E. Kıvanç Sadak, Can Barış Toprak, Hüseyin Kızıl, Enrico Salvati   +8 more
wiley   +1 more source

Negative Gaussian curvature from induced metric changes [PDF]

Physical Review E, 2015
We revisit the light or heat-induced changes in topography of initially flat sheets of solid that elongate or contract along patterned, in-plane director fields. For radial or azimuthal directors, negative Gaussian curvature is generated -- so-called "anti-cones".
Modes, Carl D, Warner, Mark
openaire   +3 more sources

Graphene as a quantum surface with curvature-strain preserving dynamics

, 2010
We discuss how the curvature and the strain density of the atomic lattice generate the quantization of graphene sheets as well as the dynamics of geometric quasiparticles propagating along the constant curvature/strain levels.
A. Cortijo, A. F. Morpurgo, A. H. Castro Neto, A. J. M. Giesbers, A. L. Mackay, A. V. Rode, D. Vanderbilt, E.-A. Kim, F. Guinea, F. Juan de, G. Dunne, H. Suzuura, H. Terrones, J. C. Meyer, J. Gonzales, K. S. Novoselov, K. Sasaki, M. S. Foster, M. V. Karasev, M. V. Karasev, M. V. Karasev, M. V. Karasev, M. V. Karasev, N. Levy, P. E. Lammert, P. R. Wallace, R. E. Peierls, R. Jackiw, R. Peierls, S. Azevedo, S. Morozov, T. Lenosky, T. Low, V. I. Tsebro, Y. Zhang   +34 more
core   +1 more source