Results 21 to 30 of about 2,107 (142)
Pore Space Characterization of Carbonated Binary Micro-Computed Tomography Images, Case Study [PDF]
Iranian Journal of Chemistry & Chemical Engineering, 2022 Pore space characterization helps a better understanding of porous media. The pore geometry and topological properties in carbonated rocks are important for a better understanding of the complex hydrologic and elastic properties.
Mohammad Ashrafi +2 more
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Brownian Motion in Minkowski Space
Entropy, 2015 We construct a model of Brownian motion in Minkowski space. There are two aspects of the problem. The first is to define a sequence of stopping times associated with the Brownian “kicks” or impulses.
Paul O'Hara, Lamberto Rondoni
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Features of the geometry of the five-dimensional pseudo-Euclidean space of index two [PDF]
E3S Web of ConferencesThe article is devoted to the study of the geometry of subspaces of a five-dimensional pseudo-Euclidean space. This space is attractive because all kinds of semi-Euclidean, semi-pseudo-Euclidean, hyperbolic three-dimensional spaces with projective ...
Artikbaev A., Mamadaliyev B.M.
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Family of right conoid hypersurfaces with light-like axis in Minkowski four-space
AIMS Mathematics<abstract><p>In the realm of the four-dimensional Minkowski space $ \mathbb{L}^{4} $, the focus is on hypersurfaces classified as right conoids and defined by light-like axes. Matrices associated with the fundamental form, Gauss map, and shape operator, all specifically tailored for these hypersurfaces, are currently undergoing computation.
Li, Yanlin +2 more
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Minkowski Functionals of Connected Soil Porosity as Indicators of Soil Tillage and Depth
Frontiers in Environmental Science, 2018 We made use of 3D tomograms from X-ray computed tomography of soil samples from a vineyard in La Rioja (Spain), to explore the ability of Minkowski functionals of connected soil pore space to discriminate between different pore space geometries coming ...
Fernando San José Martínez +2 more
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Lorentz symmetries in a doubly hyperbolic phase space: The connection with Minkowski four-space
Journal of Physics: Conference Series, 2009 The phase space kinematics of a hyperbolic position space combined with the velocity-momentum space of special relativity is shown to be compatible with the Minkowski four-space description of position and local time. The transformation between the Minkowski coordinates and those of the curvilinear hyperbolic system is given, and the implications of ...
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Waveguide Photoactuators: Materials, Fabrication, and Applications
Advanced Robotics Research, EarlyView.Waveguide photoactuators convert guided light into mechanical motion. Their tethered‐flexible design enables minimally invasive surgery and confined‐space robotics. This review aims to guide materials selection, device design, and system integration, accelerating the transition of waveguide photoactuators from laboratory prototypes to versatile ...
Minjie Xi +4 more
wiley +1 more source
Celestial Yang-Mills amplitudes and D = 4 conformal blocks
Journal of High Energy Physics, 2022 We discuss the properties of recently constructed “single-valued” celestial four-gluon amplitudes. We show that the amplitude factorizes into the “current” part and the “scalar” part.
Wei Fan +4 more
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Risk‐aware safe reinforcement learning for control of stochastic linear systems
Asian Journal of Control, EarlyView.Abstract This paper presents a risk‐aware safe reinforcement learning (RL) control design for stochastic discrete‐time linear systems. Rather than using a safety certifier to myopically intervene with the RL controller, a risk‐informed safe controller is also learned besides the RL controller, and the RL and safe controllers are combined together ...
Babak Esmaeili +2 more
wiley +1 more source
On higher-spin supertranslations and superrotations
Journal of High Energy Physics, 2017 We study the large gauge transformations of massless higher-spin fields in four-dimensional Minkowski space. Upon imposing suitable fall-off conditions, providing higher-spin counterparts of the Bondi gauge, we observe the existence of an infinite ...
Andrea Campoleoni +2 more
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